【Invention Title】
PILLAR MEMBER AND ROLL FORMED MEMBER OF VEHICLE
5 【Technical Field】
[0001] The present disclosure relates to a pillar member and
a roll formed member of a vehicle, having relatively high
strength at low cost.
10 【Background Art】
[0002] Descriptions provided hereinafter are merely
background information relating to the present disclosure, but
are not related to the related art.
[0003] Pillar members of vehicles are provided as members
15 supporting the roof of a vehicle and as structural members of
a vehicle directly affecting the safety of a driver when a
vehicle is overturned.
[0004] As illustrated in FIG. 1, pillar members may be disposed
to be connected to a roof of a vehicle. In addition, pillar
20 members may be disposed between a windshield and a side window
of a vehicle, between a front door and a rear door on a side
thereof, between the rear door and a rear window, or the like.
[0005] As collision regulations have been tightened in terms
of the safety of vehicles, the requirements for load bearing
Page 3
performance of pillar members have gradually become stricter.
Thus, high strength is required in pillar members.
[0006] However, as illustrated in FIG. 2, in the case of pillar
members of the related art, pillar members having closed
5 cross-sectional portions are formed in such a manner that two
press members are cast in an interior of an outer panel forming
a vehicle body of a vehicle, and welding flanges formed on
opposing end portions of press members are bonded by welding.
[0007] As such, in a case in which pillar members are
10 manufactured using a pressing method of the related art, a cross
section of pillar members may be significantly large, in order
to secure sufficient load bearing performance.
[0008] In detail, in a case in which pillar members of the
related art are applied to pillar members formed between the
15 windshield and the side window, driver visibility may be
obstructed by pillar members having a cross section, an area
of which has been increased, thereby causing traffic accidents.
[0009] In addition, giga-class ultra-high strength steel may
not be cast using a press casting method of the related art.
20 [0010] Thus, a suggestion for manufacturing ultra-high
strength steel using a method, such as a hot press forming (HPF)
method, has been considered, but the HPF method has a problem
in which manufacturing expenses are significantly increased.
[0011] Thus, it is required to consider manufacturing
25 structural members using a roll forming method in which the
Page 4
degree of size precision is high, substantially no scrapping
and wear of a roll occurs, thereby significantly economically
manufacturing products having a uniform cross section shape and
a relatively long length.
5
【Disclosure】
【Technical Problem】
[0012] An aspect of the present disclosure may provide a pillar
member and a roll formed member having improved load bearing
10 performance and reduced manufacturing expenses by applying a
closed cross section structure thereto.
[0013] An aspect of the present disclosure may provide a pillar
member and a roll formed member reducing costs by minimizing
usage of a steel plate and easily combined with a vehicle frame
15 and a structural member.
【Technical Solution】
[0014] According to an aspect of the present disclosure, a
pillar member of a vehicle comprises a pillar body portion
20 having at least one closed cross-sectional portion and a
connection bonding portion disposed on opposing side surfaces
of the pillar body portion and combined with a vehicle frame.
The pillar body portion and the connection bonding portion are
consecutively cast. The connection bonding portion comprises
25 a first connection bonding portion disposed on one side of the
Page 5
pillar body portion and a second connection bonding portion
disposed on the other side of the pillar body portion to oppose
the first connection bonding portion. The pillar body portion
is consecutively cast using a roll forming method in a section
5 between the first connection bonding portion and the second
connection bonding portion, thereby forming an even number of
closed cross-sectional portions.
[0015] According to another aspect of the present disclosure,
a pillar member of a vehicle comprises a pillar body portion
10 having at least one closed cross-sectional portion and a
connection bonding portion disposed on opposing side surfaces
of the pillar body portion and combined with a vehicle frame.
The pillar body portion and the connection bonding portion are
consecutively cast. The connection bonding portion comprises
15 a first connection bonding portion disposed on one side of the
pillar body portion and a second connection bonding portion
disposed on the other side of the pillar body portion to oppose
the first connection bonding portion. The pillar body portion
is consecutively cast in a section between the first connection
20 bonding portion and the second connection bonding portion using
a roll forming method to comprise a first closed cross-sectional
portion and a second closed cross-sectional portion, having a
figure-8 type cross section.
[0016] According to another aspect of the present disclosure,
25 a pillar member of a vehicle comprises a pillar body portion
Page 6
having at least one closed cross-sectional portion and a
connection bonding portion disposed on opposing side surfaces
of the pillar body portion and combined with a vehicle frame.
The pillar body portion and the connection bonding portion are
5 consecutively cast. The connection bonding portion comprises
a first connection bonding portion disposed on one side of the
pillar body portion and a second connection bonding portion
disposed on the other side of the pillar body portion to oppose
the first connection bonding portion. The pillar body portion
10 comprises a first body portion panel formed to be extended from
the first connection bonding portion, a second body portion
panel formed to be extended from the second connection bonding
portion, a first closed cross-sectional portion formed between
the first body portion panel and the second body portion panel
15 to be connected thereto and consecutively roll formed after the
first body portion panel, and a second closed cross-sectional
portion having one side connected to the first closed
cross-sectional portion and the other side connected to the
second connection bonding portion to be consecutively roll
20 formed.
[0017] Among portions of the first body portion panel and the
second body portion panel overlapping a member forming the first
closed cross-sectional portion and the second closed
cross-sectional portion, at least two portions may be lap
25 welded.
Page 7
[0018] The connection bonding portion may be welded to the at
least one closed cross-sectional portion disposed closest to
the connection bonding portion.
[0019] At least the pillar body portion between the pillar body
5 portion and the connection bonding portion may be configured
using a material selected from among martensitic steel, complex
phase (CP) steel, dual phase (DP) steel, transformation induced
plasticity (TRIP) steel, and twinning induced plasticity (TWIP)
steel, having strength of 980 MPa or higher.
10 [0020] According to another aspect of the present disclosure,
a pillar member of a vehicle comprises a pillar body portion
having at least one closed cross-sectional portion and a
connection bonding portion disposed on opposing side surfaces
of the pillar body portion and combined with a vehicle frame.
15 The pillar body portion and the connection bonding portion are
consecutively cast. The pillar body portion and the connection
bonding portion are consecutively cast using a single roll
forming process.
[0021] The pillar member of a vehicle comprises the pillar body
20 portion having a multiple-closed cross-sectional structure
including a plurality of closed cross-sectional portions formed
to have a triangular cross-sectional shape or a quadrangular
cross-sectional shape.
[0022] The connection bonding portion may be disposed on a
25 portion of opposing side surfaces of the pillar body portion
Page 8
in a length direction.
[0023] The pillar body portion and the connection bonding
portion may be formed at an interface between a windshield and
a side window of the vehicle frame in a length direction.
5 [0024] According to an aspect of the present disclosure, a roll
formed member comprises a roll formed body portion having at
least one closed cross-sectional portion and a connection
bonding portion disposed on at least one side of the roll formed
body portion and combined with a structural member. The roll
10 formed body portion and the connection bonding portion are
integrally cast using a roll forming method.
[0025] The connection bonding portion may include a first
connection bonding portion disposed on one side of the roll
formed body portion and a second connection bonding portion
15 disposed on the other side of the roll formed body portion to
oppose the first connection bonding portion.
[0026] The roll formed body portion may be consecutively cast
in a section between the first connection bonding portion and
the second connection bonding portion using the roll forming
20 method, in order to form an even number of closed
cross-sectional portions.
[0027] The roll formed body portion may be consecutively cast
in a section between the first connection bonding portion and
the second connection bonding portion using the roll forming
25 method, in order to provide a first closed cross-sectional
Page 9
portion and a second closed cross-sectional portion, having a
figure-8 type cross section.
[0028] The roll formed body portion may include a first body
portion panel formed to be extended from the first connection
5 bonding portion, a second body portion panel formed to be
extended from the second connection bonding portion, a first
closed cross-sectional portion connected to the first body
portion panel and consecutively roll formed, and a second closed
cross-sectional portion having one side connected to the first
10 closed cross-sectional portion and the other side connected to
the second body portion panel and consecutively roll formed.
[0029] Among portions of the first body portion panel and the
second body portion panel overlapping a member forming the first
closed cross-sectional portion and the second closed
15 cross-sectional portion, at least two portions may be lap
welded.
[0030] The connection bonding portion may be welded to the at
least one closed cross-sectional portion disposed closest to
the connection bonding portion.
20 [0031] At least the roll formed body portion between the roll
formed body portion and the connection bonding portion may be
configured using a material selected from among martensitic
steel, complex phase (CP) steel, dual phase (DP) steel,
transformation induced plasticity (TRIP) steel, and twinning
25 induced plasticity (TWIP) steel, having strength of 980 MPa or
Page 10
higher.
[0032] The roll formed body portion and the connection bonding
portion may be consecutively cast using a single roll forming
process.
5 [0033] The roll formed member comprises the roll formed body
portion having a multiple-closed cross-sectional structure
including a plurality of closed cross-sectional portions formed
to have a triangular cross-sectional shape or a quadrangular
cross-sectional shape.
10 [0034] The connection bonding portion may be formed on a
portion of opposing side surfaces of the roll formed body
portion in a length direction.
【Advantageous Effects】
15 [0035] According to an aspect of the present disclosure, load
bearing performance may be improved by applying a closed
cross-sectional structure, production rates of a pillar member
and a roll formed member may be increased by reducing usage of
steel and an amount of welding, and manufacturing expenses may
20 be decreased by reducing the usage of steel and the amount of
welding.
[0036] According to an aspect of the present disclosure,
manufacturing expenses may be reduced in such a manner that a
closed cross-sectional structure is formed to improve load
25 bearing performance of a pillar member and a roll formed member,
Page 11
and a manufacturing process is streamlined, simultaneously, by
consecutively casting the pillar member and the roll formed
member using a roll forming process.
5 【Description of Drawings】
[0037] FIG. 1 is a view illustrating a state in which a pillar
member is disposed in a vehicle.
[0038] FIG. 2 is a view of a pillar member of a vehicle of the
related art, formed in such a manner that two press members are
10 welded together.
[0039] FIG. 3 is a perspective view of a pillar member of a
vehicle according to an exemplary embodiment in the present
disclosure.
[0040] FIG. 4 is a perspective view of a pillar member of a
15 vehicle according to another exemplary embodiment.
[0041] FIG. 5 is a cross-sectional view of a pillar member of
a vehicle according to an exemplary embodiment.
[0042] FIG. 6 is a cross-sectional view of a pillar member of
a vehicle according to another exemplary embodiment.
20 [0043] FIG. 7A is a view contrasting a cross section of the
pillar member combined with a vehicle frame of the related art
illustrated in FIG. 2 and a cross section of the pillar member
combined with a vehicle frame of the present disclosure
illustrated in FIG. 5.
25 [0044] FIG. 7B is a view contrasting a disposition area of the
Page 12
pillar member combined with the vehicle frame of the related
art illustrated in FIG. 2 and a disposition area of the pillar
member combined with the vehicle frame of the present disclosure
illustrated in FIG. 5.
5 [0045] FIG. 7C is a view contrasting a cross section of the
pillar member of the vehicle of the related art illustrated in
FIG. 2 and a cross section of the pillar member of the vehicle
of the present disclosure illustrated in FIG. 5.
[0046] FIG. 8 is a view of a roll formed member of the related
10 art.
[0047] FIG. 9 is a perspective view of a roll formed member
according to an exemplary embodiment.
[0048] FIG. 10 is a perspective view of a roll formed member
according to another exemplary embodiment.
15 [0049] FIG. 11 is a cross-sectional view of a roll formed member
according to an exemplary embodiment.
[0050] FIG. 12 is a cross-sectional view of a roll formed member
according to another exemplary embodiment.
[0051] FIG. 13 is a view contrasting a cross section of the
20 roll formed member of the related art illustrated in FIG. 8 and
a cross section of the roll formed member of the present
disclosure illustrated in FIG. 11.
[0052] FIG. 14 is a view contrasting the cross section of the
roll formed member of the related art illustrated in FIG. 8 and
25 a disposition area of the roll formed member of the present
Page 13
disclosure illustrated in FIG. 11.
[0053] FIG. 15 is a view of a cross-sectional view of a roll
formed member according to another exemplary embodiment.
[0054] FIGS. 16 to 19 are views of a roll formed member of the
5 present disclosure having various exemplary embodiments.
【Best Mode for Invention】
[0055] Hereinafter, examples of the present disclosure will
be described in detail with reference to the accompanying
10 drawings. The disclosure may, however, be exemplified in many
different forms and should not be construed as being limited
to the specific embodiments set forth herein, and those skilled
in the art and understanding the present disclosure can easily
accomplish retrogressive inventions or other embodiments
15 included in the scope of the present disclosure by the addition,
modification, and removal of components within the same scope,
but those are construed as being included in the scope of the
present disclosure. Like reference numerals will be used to
designate like components having similar functions throughout
20 the drawings within the scope of the present disclosure.
[0056] Hereinafter, a pillar member 10 of a vehicle according
to an exemplary embodiment in the present disclosure will be
described in detail with reference to the attached drawings.
[0057] With reference to FIGS. 1 to 7C, the pillar member 10
25 according to an exemplary embodiment may include a pillar body
Page 14
portion 100 and a connection bonding portion 200.
[0058] As illustrated in FIG. 3, the pillar member 10 may
comprise the pillar body portion 100 including at least one
closed cross-sectional portion 110 and the connection bonding
5 portions 200 disposed on opposing side surfaces of the pillar
body portion 100 and combined with a vehicle frame 1. In
addition, the pillar body portion 100 and the connection bonding
portion 200 may be consecutively cast.
[0059] The pillar body portion 100 and the connection bonding
10 portion 200, forming the pillar member 10, may be cast to be
members having a desired form in such a manner that a steel plate
is folded by a roll forming device to have a multistage cross
section.
[0060] As illustrated in FIGS. 3 and 4, the pillar body portion
15 100 and the connection bonding portion 200 may be consecutively
cast using a single roll forming process.
[0061] In FIG. 4, in a state in which opposing sides of a panel,
such as a steel plate, or the like, forming the pillar body
portion 100 and the connection bonding portion 200 are cut in
20 advance, and the connection bonding portion 200 is partially
formed, the pillar member 10 and the connection bonding portion
200 may be consecutively cast using the single roll forming
process.
[0062] Without a disconnection in the steel plate, a first
25 connection bonding portion 210, the pillar body portion 100,
Page 15
and a second connection bonding portion 230 are sequentially
roll formed, thereby being consecutively cast using the single
roll forming process.
[0063] The roll forming process allows for a relatively high
5 degree of size precision and results in substantially no
scrapping and wear of a roll, thereby significantly
economically manufacturing products having a uniform cross
section shape and a relatively long length.
[0064] The roll forming process is a technology in which
10 whenever a set of upper and lower multistage stationary rotating
rolls are arranged, and a coil or a material that has been cut
passes between each set of rotating rolls, a component is
gradually cast to have a form in which a cross section thereof
is uniform and a length thereof is relatively long.
15 [0065] In detail, since ultra-high strength steel may be cast,
the roll forming process is suitable to manufacture a high
strength steel component of a vehicle.
[0066] As illustrated in FIGS. 3 and 4, the connection bonding
portion 200 may include the first connection bonding portion
20 210 and the second connection bonding portion 230.
[0067] The connection bonding portion 200 may include the first
connection bonding portion 210 disposed on one side of the
pillar body portion 100 and the second connection bonding
portion 230 disposed on the other side of the pillar body portion
25 100 to oppose the first connection bonding portion 210.
Page 16
[0068] The pillar body portion 100 may be consecutively cast
in a section between the first connection bonding portion 210
and the second connection bonding portion 230 using a roll
forming method, thereby forming an even number of closed
5 cross-sectional portions 110.
[0069] A closed cross-sectional portion 110 formed in the
pillar body portion 100 may be provided as an even number of
closed cross-sectional portions, so that the pillar body
portion 100 and the connection bonding portion 200 may be
10 integrally cast using the single roll forming process.
[0070] As illustrated in FIGS. 5 to 6, in order that the pillar
body portion 100 and the connection bonding portion 200 are
integrally roll formed, and the connection bonding portion 200
is formed on the opposing side surfaces of the pillar body
15 portion 100, the closed cross-sectional portion 110 may be
provided as an even number of closed cross-sectional portions.
[0071] In a case in which an odd number of closed
cross-sectional portions 110 are consecutively formed in the
pillar body portion 100, the connection bonding portions 200
20 may not be formed on opposing side surfaces of the pillar body
portion 100 to oppose each other, and may be formed in the same
direction.
[0072] Thus, in order that two connection bonding portions 200
opposing each other to be combined with the vehicle frame 1 are
25 formed in the pillar body portion 100, and the connection
Page 17
bonding portion 200 and the pillar body portion 100 are
integrally cast using the single roll forming process, the
closed cross-sectional portion 110 may be provided as an even
number of closed cross-sectional portions.
5 [0073] The pillar member 10 according to an exemplary
embodiment may form the pillar body portion 100 having a closed
cross-sectional structure. The connection bonding portions
200 opposing each other to be connected to the vehicle frame
1 on opposing side surfaces of the pillar body portion 100 may
10 be cast using the single roll forming process.
[0074] Thus, the pillar member 10 according to an exemplary
embodiment may improve load bearing performance by having a
closed cross-sectional structure, may increase a production
rate of the pillar member 10 by reducing an amount of welding,
15 and may reduce manufacturing expenses of the pillar member 10
due to a reduction in the amount of welding.
[0075] In addition, in the case of the pillar member 10
according to an exemplary embodiment, manufacturing expenses
may be reduced, and the vehicle frame 1 may be easily combined
20 therewith by minimizing usage of a steel plate used to
manufacture the pillar member 10, in such a manner that the
closed cross-sectional structure to improve load bearing
performance is formed, and the connection bonding portions 200
opposing each other are formed on the opposing side surfaces
25 of the pillar body portion 100.
Page 18
[0076] The pillar body portion 100 may form a figure-8 type
cross section in which two closed cross-sectional portions 110
are consecutively formed using the roll forming method.
[0077] As illustrated in FIG. 5A, the pillar body portion 100
5 may be consecutively cast in the section between the first
connection bonding portion 210 and the second connection
bonding portion 230 using the roll forming method, thereby
including a first closed cross-sectional portion 111 and a
second closed cross-sectional portion 112, having the figure-8
10 type cross section.
[0078] As illustrated in FIG. 5A, in order to bond the first
connection bonding portion 210, the pillar body portion 100,
and the second connection bonding portion 230, consecutively
roll formed, the first connection bonding portion 210, the
15 pillar body portion 100, and the second connection body portion
may be bonded by welding at two points.
[0079] As such, the pillar body portion 100 having a
multiple-closed cross-sectional structure including two or
more closed cross-sectional portions 110 may be formed, and the
20 connection bonding portions 200 opposing each other may be
formed on the opposing side surfaces of the pillar body portion
100 in such a manner that, in order to bond the first connection
bonding portion 210, the pillar body portion 100, and the second
connection bonding portion 230, consecutively roll formed, the
25 first connection bonding portion 210, the pillar body portion
Page 19
100, and the second connection bonding portion 230 are bonded
by welding at two points.
[0080] Thus, the pillar member 10 according to an exemplary
embodiment may improve load bearing performance by having the
5 multiple-closed cross-sectional structure, may increase a
production rate of the pillar member 10 by reducing the amount
of welding, and may reduce the manufacturing expenses of the
pillar member 10 due to the reduction in the amount of welding.
[0081] In addition, in the case of the pillar member 10
10 according to an exemplary embodiment, the manufacturing
expenses may be reduced, and the vehicle frame 1 may be easily
combined therewith by minimizing the usage of the steel plate
used to manufacture the pillar member 10, in such a manner that
the multiple-closed cross-sectional structure to improve load
15 bearing performance is formed, and the connection bonding
portions 200 opposing each other are formed on the opposing side
surfaces of the pillar body portion 100.
[0082] As illustrated in FIGS. 5 and 6, the pillar body portion
100 may include a first body portion panel 130, a second body
20 portion panel 150, the first closed cross-sectional portion 111,
and the second closed cross-sectional portion 112.
[0083] The connection bonding portion 200 may include the first
connection bonding portion 210 provided on one side surface of
the pillar body portion 100 and the second connection bonding
25 portion 230 provided on the other side surface of the pillar
Page 20
body portion 100. The pillar body portion 100 may include the
first body portion panel 130 formed to be extended from the first
connection bonding portion 210, the second body portion panel
150 formed to be extended from the second connection bonding
5 portion 230, the first closed cross-sectional portion 111
formed between the first body portion panel 130 and the second
body portion panel 150 to be connected thereto and consecutively
roll formed in the first body portion panel 130, and the second
closed cross-sectional portion 112 having one side connected
10 to the first closed cross-sectional portion 111 and the other
side connected to the second connection bonding portion 230 and
consecutively roll formed.
[0084] The pillar body portion 100 may include the first body
portion panel 130 formed to be extended from the first
15 connection bonding portion 210, the second body portion panel
150 formed to be extended from the second connection bonding
portion 230, the first closed cross-sectional portion 111
consecutively roll formed to be connected to the first body
portion panel 130, and the second closed cross-sectional
20 portion 112 having one side connected to the first closed
cross-sectional portion 111 and the other side connected to the
second body portion panel 150 and consecutively roll formed.
[0085] A first closed cross-sectional portion 311 and a second
closed cross-sectional portion 312 may be formed between a first
25 body portion panel 330 and a second body portion panel 350 to
Page 21
be connected thereto and may be consecutively roll formed.
[0086] The pillar body portion 100 may form a multiple-closed
cross-sectional structure including a plurality of closed
cross-sectional portions 110 formed to have a triangular
5 cross-sectional shape or a quadrangular cross-sectional shape.
[0087] As illustrated in FIG. 5, the first closed
cross-sectional portion 111 and the second closed
cross-sectional portion 112 may be formed to have a quadrangular
cross-sectional shape, corners of which may have a
10 predetermined curvature.
[0088] As illustrated in FIG. 6A, the first closed
cross-sectional portion 111 and the second closed
cross-sectional portion 112 may be formed to have a triangular
cross-sectional shape, corners of which may have a
15 predetermined curvature.
[0089] However, a shape of the closed cross-sectional portion
110 is not limited to being triangular or quadrangular. The
closed cross-sectional portion 110 may have any type of
polygonal cross section that may improve load bearing
20 performance of the pillar member 10.
[0090] As illustrated in FIG. 6B, the first closed
cross-sectional portion 111, the second closed cross-sectional
portion 112, a third closed cross-sectional portion 113, and
a fourth closed cross-sectional portion 114 may be formed to
25 have a quadrangular cross-sectional shape, corners of which may
Page 22
have a predetermined curvature.
[0091] In FIG. 6A, two closed cross-sectional portions 110 are
formed, while, in FIG. 6B, four closed cross-sectional portions
110 are formed. FIGS. 6A and 6B have a difference in load
5 bearing performance of the pillar member 10 and manufacturing
expenses depending on usage of steel, or the like.
[0092] FIG. 6A illustrates a form of an optimal pillar member
10 according to an exemplary embodiment securing sufficient
load bearing performance by forming a multiple-closed
10 cross-sectional structure including two closed
cross-sectional portions 110 and reducing the manufacturing
expenses of the pillar member 10 by minimizing the usage of steel
and the amount of welding.
[0093] In the meantime, in FIG. 6B, a multiple-closed
15 cross-sectional structure is formed by forming four closed
cross-sectional portions 110, thereby increasing
manufacturing expenses, as compared with the case in FIG. 6A,
due to an increase in the usage of steel, but load bearing
performance is improved.
20 [0094] In the case of FIG. 6B, there is substantially no change
in an area of cross sections of the pillar member 10 and the
vehicle frame 1. Thus, FIG. 6A and FIG. 6B have no significant
difference in terms of securing driver visibility.
[0095] Thus, in the case of a vehicle requiring sufficient load
25 bearing performance in terms of structural stability of a
Page 23
vehicle, such as an emergency vehicle, the pillar member 10
illustrated in FIG. 6B may be applied thereto.
[0096] As illustrated in FIG. 5B, in the case of the pillar
member 10, at least two portions among portions of a body portion
5 panel overlapping a member forming the closed cross-sectional
portion 110 may be lap welded.
[0097] A portion in which the first body portion panel 130
overlaps a member of the second closed cross-sectional portion
112 and a portion in which the second body portion panel 150
10 overlaps a member of the first closed cross-sectional portion
111 may be lap welded.
[0098] As illustrated in FIGS. 5A, 6A, and 6B, the connection
bonding portion 200 may be bonded by welding to the closed
cross-sectional portion 110 disposed closest to the connection
15 bonding portion 200. In other words, the closed
cross-sectional portion 110 disposed on a portion in which an
interface between the closed cross-sectional portion 110 and
the connection bonding portion 200 is formed may be bonded by
welding at the interface.
20 [0099] As illustrated in FIGS. 5A and 6A, the first connection
bonding portion 210 may be bonded by welding to the first closed
cross-sectional portion 111 disposed closest to the first
connection bonding portion 210, while the second connection
bonding portion 230 may be bonded by welding to the second closed
25 cross-sectional portion 112 disposed closest to the second
Page 24
connection bonding portion 230.
[00100] Structural strength of the pillar member 10
may be secured by forming a welding portion W at only two points.
Thus, the amount of welding to form the pillar member 10 may
5 be reduced, thereby reducing the manufacturing expenses of the
pillar member 10 and securing sufficient strength thereof.
[00101] As illustrated in FIG. 6B, the first
connection bonding portion 210 may be bonded by welding to the
first closed cross-sectional portion 111 disposed closest to
10 the first connection bonding portion 210, while the second
connection bonding portion 230 may be bonded by welding to the
fourth closed cross-sectional portion 114 disposed closest to
the second connection bonding portion 230.
[00102] At least the pillar body portion 100 between
15 the pillar body portion 100 and the connection bonding portion
200 may be configured using a material selected from among
martensitic steel, complex phase (CP) steel, dual phase (DP)
steel, transformation induced plasticity (TRIP) steel, and
twinning induced plasticity (TWIP) steel, having strength of
20 980 MPa or higher.
[00103] As illustrated in FIG. 4, the connection
bonding portion 200 may be formed on a portion of opposing side
surfaces of the pillar body portion 100 in a length direction.
[00104] In a case in which the closed cross-sectional
25 portion 110 forming the pillar body portion 100 and the
Page 25
connection bonding portion 200 are bonded by welding, an
entirety of the connection bonding portion 200 is not required
to be combined with the vehicle frame 1. Thus, the connection
bonding portion 200 may not be formed on an entirety of sides
5 of the pillar body portion 100 in a length direction thereof,
but formed on a portion of sides thereof in the length direction.
[00105] Thus, the usage of steel used to form the
connection bonding portion 200 is reduced, and the amount of
welding to combine the vehicle frame 1 and a connection bonding
10 portion is minimized, thereby reducing the manufacturing
expenses of the pillar member 10 of a vehicle.
[00106] As illustrated in FIG. 1, the pillar body
portion 100 and the connection bonding portion 200 may be formed
at an interface between a windshield and a side window of the
15 vehicle frame 1 in a length direction.
[00107] The pillar body portion 100 and the connection
bonding portion 200 may be cast using a roll bending process,
thereby forming a curvature in the length direction.
[00108] As illustrated in FIG. 1, in a case in which
20 a predetermined curvature is required to be set in a length
direction in the same manner as the pillar member 10 disposed
between the windshield and the side window of the vehicle frame
1, the pillar body portion 100 and the connection bonding
portion 200 are consecutively cast using a single roll forming
25 process to manufacture the pillar member 10, and then the pillar
Page 26
member 10 that has been manufactured may be cast using the roll
bending process to have a predetermined curvature in the length
direction.
[00109] Hereinafter, with reference to FIGS. 7A to 7C,
5 a pillar member 10 of the related art illustrated in FIG. 2 and
a pillar member 10 of the present disclosure illustrated in FIG.
5 will be compared, to be described.
[00110] First, FIG. 7A is a view contrasting a cross
section of the pillar member 10 combined with a vehicle frame
10 1 of the related art illustrated in FIG. 2 and a cross section
of the pillar member 10 combined with a vehicle frame 1 of the
present disclosure illustrated in FIG. 5.
[00111] FIG. 7B is a view contrasting a disposition
area of the pillar member 10 combined with the vehicle frame
15 1 of the related art illustrated in FIG. 2 and a disposition
area of the pillar member 10 combined with the vehicle frame
1 of the present disclosure illustrated in FIG. 5.
[00112] FIG. 7C is a view contrasting the cross section
of the pillar member 10 of the vehicle of the related art
20 illustrated in FIG. 2 and the cross section of the pillar member
10 of the vehicle of the present disclosure illustrated in FIG.
5.
[00113] As such, as illustrated in FIG. 7C, in the case
of the pillar member 10 according to an exemplary embodiment
25 illustrated in FIG. 5, an area of a cross section thereof is
Page 27
significantly reduced as compared with that of a cross section
of the pillar member 10 of the related art illustrated in FIG.
2, so that the pillar member 10 forming a structural member of
a vehicle may secure sufficient load bearing performance, and
the 5 area of a cross section of the pillar member 10 is decreased.
Thus, manufacturing expenses of the pillar member 10 may be
decreased. In addition, driver visibility may be sufficiently
secured.
[00114] With reference to FIG. 7B, it can be confirmed
10 that a first area S1, a disposition area, including the pillar
member 10 according to an exemplary embodiment illustrated in
FIG. 5 and including an outer panel forming the vehicle frame
1 of a vehicle is significantly different from a second area
S2, a disposition area, including the pillar member 10 of the
15 related art illustrated in FIG. 2 and an outer panel, in terms
of a cross section.
[00115] Hereinafter, a roll formed member 20
according to an exemplary embodiment in the present disclosure
will be described in detail with reference to the attached
20 drawings.
[00116] With reference to FIG. 9, the roll formed
member 20 according to an exemplary embodiment may include a
roll formed body portion 300 and a connection bonding portion
400.
25 [00117] As illustrated in FIG. 9, the roll formed
Page 28
member 20 may include the roll formed body portion 300 forming
at least one closed cross-sectional portion 310 and the
connection bonding portion 400 disposed on at least one side
of the roll formed body portion 300 and combined with a
5 structural member 5. The roll formed body portion 300 and the
connection bonding portion 400 may be consecutively cast.
[00118] The connection bonding portion 400 may be
formed on opposing side surfaces of the roll formed body portion
300. In this case, the structural member 5 may be disposed on
10 the opposing side surfaces of the roll formed body portion 300
by the medium of the connection bonding portion 400.
[00119] In addition, the connection bonding portion
400 may be formed on a side of the roll formed body portion 300.
In this case, the structural member 5 may only be disposed on
15 the side of the roll formed body portion 300.
[00120] The roll formed body portion 300 and the
connection bonding portion 400 forming the roll formed member
20 may be cast to be a member having a desired form in such a
manner that a steel plate is folded by a roll forming device
20 to have a multistage cross section.
[00121] As illustrated in FIGS. 9 and 10, the roll
formed body portion 300 and the connection bonding portion 400
may be consecutively cast using the single roll forming process.
[00122] In FIG. 10, in a state in which opposing sides
25 of a panel, such as a steel plate, or the like, forming the roll
Page 29
formed body portion 300 and the connection bonding portion 400
are cut in advance, and the connection bonding portion 400 is
partially formed, the roll formed member 20 and the connection
bonding portion 400 may be consecutively cast using the single
5 roll forming process.
[00123] Without disconnection in the steel plate, a
first connection bonding portion 410, the roll formed body
portion 300, and a second connection bonding portion 430 are
sequentially roll formed, thereby consecutively being cast
10 using the single roll forming process.
[00124] A roll forming process allows for a relatively
high degree of size precision and causes substantially no
scrapping and wear of a roll, thereby significantly
economically manufacturing products having a uniform cross
15 section shape and having a relatively long length.
[00125] The roll forming process is a technology in
which whenever a set of upper and lower multistage stationary
rotating rolls is arranged, and a coil or a material that has
been cut passes between each set of rotating rolls, a component
20 is gradually cast to have a form in which a cross section thereof
is uniform and a length thereof is relatively long.
[00126] In detail, since ultra-high strength steel
may also be cast using the roll forming process, the roll forming
process is suitable to manufacture a high strength steel
25 component of a vehicle.
Page 30
[00127] As illustrated in FIGS. 9 and 10, the
connection bonding portion 400 may include the first connection
bonding portion 410 and the second connection bonding portion
430.
5 [00128] The connection bonding portion 400 may
include the first connection bonding portion 410 disposed on
one side of the roll formed body portion 300 and the second
connection bonding portion 430 disposed on the other side of
the roll formed body portion 300 to oppose the first connection
10 bonding portion 410.
[00129] The roll formed body portion 300 may be
consecutively cast in a section between the first connection
bonding portion 410 and the second connection bonding portion
430 using a roll forming method, thereby forming an even number
15 of closed cross-sectional portions 310.
[00130] In this case, the closed cross-sectional
portion 310 may be consecutively formed, while closed
cross-sectional portions disposed adjacent to each other may
be formed to be in contact with each other.
20 [00131] The closed cross-sectional portion 310 formed
in the roll formed body portion 300 may be provided as an even
number of closed cross-sectional portions, so that the roll
formed body portion 300 and the connection bonding portion 400
may be integrally cast using the single roll forming process.
25 [00132] As illustrated in FIGS. 11 to 12, in order that
Page 31
the roll formed body portion 300 and the connection bonding
portion 400 are integrally roll formed, and the connection
bonding portion 400 is formed on the opposing side surfaces of
the roll formed body portion 300, the closed cross-sectional
5 portion 310 may be provided as an even number of closed
cross-sectional portions.
[00133] In a case in which an odd number of closed
cross-sectional portions 310 are consecutively formed in the
roll formed body portion 300, the connection bonding portions
10 400 may not be formed on opposing side surfaces of the roll formed
body portion 300 to oppose each other, and may be formed in the
same direction.
[00134] Thus, in order that two connection bonding
portions 400 opposing each other to be combined with the
15 structural member 5 are formed in the roll formed body portion
300, and the connection bonding portion 400 and the roll formed
body portion 300 are integrally cast using the single roll
forming process, the closed cross-sectional portion 310 may be
provided as an even number of closed cross-sectional portions.
20 [00135] The roll formed member 20 according to an
exemplary embodiment may form the roll formed body portion 300
having a closed cross-sectional structure. The connection
bonding portions 400 opposing each other to be connected to the
structural member 5 on opposing side surfaces of the roll formed
25 body portion 300 may be cast using the single roll forming
Page 32
process.
[00136] Thus, the roll formed member 20 according to
an exemplary embodiment may improve load bearing performance
by having a closed cross-sectional structure, may increase a
5 production rate of the roll formed member 20 by reducing an
amount of welding, and may reduce manufacturing expenses of the
roll formed member 20 due to a reduction in the amount of welding.
[00137] In addition, in the case of the roll formed
member 20 according to an exemplary embodiment, manufacturing
10 expenses may be reduced, and the structural member 5 may be
easily combined therewith by minimizing usage of a steel plate
used to manufacture the roll formed member 20, in such a manner
that the closed cross-sectional structure to improve load
bearing performance is formed, and the connection bonding
15 portions 400 opposing each other are formed on the opposing side
surfaces of the roll formed body portion 300.
[00138] The roll formed body portion 300 may have a
figure-8 type cross section in which two closed cross-sectional
portions 310 are consecutively formed using the roll forming
20 method.
[00139] As illustrated in FIG. 11A, the roll formed
body portion 300 may be consecutively cast in the section
between the first connection bonding portion 410 and the second
connection bonding portion 430 using the roll forming method,
25 thereby including a first closed cross-sectional portion 311
Page 33
and a second closed cross-sectional portion 312, having the
figure-8 type cross section.
[00140] As illustrated in FIG. 11A, in order to bond
the first connection bonding portion 410, the roll formed body
5 portion 300, and the second connection bonding portion 430,
consecutively roll formed, the first connection bonding portion
410, the roll formed body portion 300, and the second connection
bonding portion 430 may be bonded by welding at two points.
[00141] As such, the roll formed body portion 300
10 having a multiple-closed cross-sectional structure including
two or more closed cross-sectional portions 310 may be formed,
and the connection bonding portions 400 opposing each other may
be formed on the opposing side surfaces of the roll formed body
portion 300 in such a manner that, in order to bond the first
15 connection bonding portion 410, the roll formed body portion
300, and the second connection bonding portion 430,
consecutively roll formed, the first connection bonding portion
410, the roll formed body portion 300, and the second connection
bonding portion 430 are bonded by welding at two points.
20 [00142] Thus, the roll formed member 20 according to
an exemplary embodiment may improve load bearing performance
by having the multiple-closed cross-sectional structure, may
increase a production rate of the roll formed member 20 by
reducing the amount of welding, and may reduce the manufacturing
25 expenses of the roll formed member 20 due to the reduction in
Page 34
the amount of welding.
[00143] In addition, in the case of the roll formed
member 20 according to an exemplary embodiment, the
manufacturing expenses may be reduced, and the structural
5 member 5 may be easily combined therewith by minimizing the
usage of the steel plate used to manufacture the roll formed
member 20, in such a manner that the closed cross-sectional
structure to improve load bearing performance is formed, and
the connection bonding portions 400 opposing each other are
10 formed on the opposing side surfaces of the roll formed body
portion 300.
[00144] As illustrated in FIGS. 11 and 12, the roll
formed body portion 300 may include a first body portion panel
330, a second body portion panel 350, the first closed
15 cross-sectional portion 311, and the second closed
cross-sectional portion 312.
[00145] The connection bonding portion 400 may
include the first connection bonding portion 410 provided on
one side surface of the roll formed body portion 300 and the
20 second connection bonding portion 430 provided on the other side
surface of the roll formed body portion 300. The roll formed
body portion 300 may include the first body portion panel 330
formed to be extended from the first connection bonding portion
410, the second body portion panel 350 formed to be extended
25 from the second connection bonding portion 430, the first closed
Page 35
cross-sectional portion 311 connected to the first body portion
panel 330 and consecutively roll formed, and the second closed
cross-sectional portion 312 having one side connected to the
first closed cross-sectional portion 311 and the other side
5 connected to the second body portion panel 350 and consecutively
roll formed.
[00146] The first closed cross-sectional portion 311
and the second closed cross-sectional portion 312 may be formed
between the first body portion panel 330 and the second body
10 portion panel 350 to be connected thereto and may be
consecutively roll formed.
[00147] The roll formed body portion 300 may form the
multiple-closed cross-sectional structure including a
plurality of closed cross-sectional portions 310 formed to have
15 a triangular cross-sectional shape or a quadrangular
cross-sectional shape.
[00148] As illustrated in FIG. 11, the first closed
cross-sectional portion 311 and the second closed
cross-sectional portion 312 may be formed to have a quadrangular
20 cross-sectional shape, corners of which may have a
predetermined curvature.
[00149] As illustrated in FIG. 12A, the first closed
cross-sectional portion 311 and the second closed
cross-sectional portion 312 may be formed to have a triangular
25 cross-sectional shape, corners of which may have a
Page 36
predetermined curvature.
[00150] However, a shape of the closed
cross-sectional portion 310 is not limited to a triangle and
a quadrangle. The closed cross-sectional portion 310 may have
5 any type of polygonal cross section that may improve load
bearing performance of the roll formed member 20.
[00151] As illustrated in FIG. 12B, the first closed
cross-sectional portion 311, the second closed cross-sectional
portion 312, a third closed cross-sectional portion 313, and
10 a fourth closed cross-sectional portion 314 may be formed to
have a quadrangular cross-sectional shape, corners of which may
have a predetermined curvature.
[00152] In FIG. 12A, two closed cross-sectional
portions 310 are formed, while, in FIG. 12B, four closed
15 cross-sectional portions 310 are formed. FIG. 12A and FIG. 12B
have a difference in load bearing performance of the roll formed
member 20 and manufacturing expenses depending on usage of steel,
or the like.
[00153] FIG. 12A illustrates a form of an optimum roll
20 formed member 20, according to an exemplary embodiment,
securing sufficient load bearing performance by forming the
multiple-closed cross-sectional structure including two
closed cross-sectional portions 310 and reducing the
manufacturing expenses of the roll formed member 20 by
25 minimizing the usage of steel and the amount of welding.
Page 37
[00154] In the meantime, in FIG. 12B, the
multiple-closed cross-sectional structure is formed by forming
four closed cross-sectional portions 310, thereby increasing
manufacturing expenses, as compared with the case in FIG. 12A,
5 due to an increase in the usage of steel, but load bearing
performance is improved.
[00155] In the case of FIG. 12B, there is substantially
no change in areas of cross sections of the roll formed member
20 and the structural member 5.
10 [00156] Thus, the roll formed member 20 illustrated
in FIG. 12B may be applied to a connection portion of the
structural member 5 requiring sufficient load bearing
performance.
[00157] As illustrated in FIG. 11B, in the case of the
15 roll formed member 20, at least nine portions among portions
in which a body portion panel overlaps a member forming the
closed cross-sectional portion 310 may be lap welded.
[00158] A portion in which the first body portion panel
330 overlaps a member of the second closed cross-sectional
20 portion 312 and a portion in which the second body portion panel
350 overlaps the first closed cross-sectional portion 311 may
be lap welded.
[00159] As illustrated in FIGS. 11A, 12A, and 12B, the
connection bonding portion 400 may be bonded by welding to the
25 closed cross-sectional portion 310 disposed closest to the
Page 38
connection bonding portion 400. In other words, the closed
cross-sectional portion 310 disposed in a portion in which the
interface is formed between the connection bonding portion 400
and the closed cross-sectional portion 310 may be bonded by
5 welding at the interface.
[00160] As illustrated in FIGS. 11A and 12A, the first
connection bonding portion 410 may be bonded by welding to the
first closed cross-sectional portion 311 disposed closest to
the first connection bonding portion 410, while the second
10 connection bonding portion 430 may be bonded by welding to the
second closed cross-sectional portion 312 disposed closest to
the second connection bonding portion 430.
[00161] Structural strength of the roll formed member
20 may be secured by forming a welding portion W at only two
15 points. Thus, the amount of welding to form the roll formed
member 20 may be reduced, thereby reducing the manufacturing
expenses of the roll formed member 20 and securing sufficient
strength thereof.
[00162] As illustrated in FIG. 12B, the first
20 connection bonding portion 410 may be bonded by welding to the
first closed cross-sectional portion 311 disposed closest to
the first connection bonding portion 410, while the second
connection bonding portion 430 may be bonded by welding to the
fourth closed cross-sectional portion 314 disposed closest to
25 the second connection bonding portion 430.
Page 39
[00163] At least the roll formed body portion 300
between the roll formed body portion 300 and the connection
bonding portion 400 may be configured using a material selected
from among martensitic steel, CP steel, DP steel, TRIP steel,
5 and TWIP steel, having strength of 980 MPa or higher.
[00164] As illustrated in FIG. 10, the connection
bonding portion 400 may be formed on a portion of opposing side
surfaces of the roll formed body portion 300 in a length
direction.
10 [00165] In a case in which the interface between the
closed cross-sectional portion 310 forming the roll formed body
portion 300 and the connection bonding portion 400 is bonded
by welding, an entirety of the connection bonding portion 400
is not required to be combined with the structural member 5.
15 Thus, the connection bonding portion 400 may not be formed in
an entirety of side surfaces of the roll formed body portion
300 in a length direction, but formed on a portion thereof in
the length direction.
[00166] Thus, the usage of steel used to form the
20 connection bonding portion 400 is reduced, and the amount of
welding to combine the structural member 5 and a connection
bonding portion is minimized, thereby reducing the
manufacturing expenses of the roll formed member 20.
[00167] As illustrated in FIG. 10, the roll formed body
25 portion 300 and the connection bonding portion 400 may be formed
Page 40
at an interface of the structural member 5 in a length direction.
[00168] The roll formed body portion 300 and the
connection bonding portion 400 may be cast using a roll bending
process, thereby forming a curvature in the length direction.
5 [00169] In a case in which a predetermined curvature
is required to be set in a length direction in the same manner
as the roll formed member 20 disposed to be bonded to the
structural member 5, the roll formed body portion 300 and the
connection bonding portion 400 are consecutively cast using the
10 single roll forming process to manufacture the roll formed
member 20, and then the roll formed member 20 that has been
manufactured may be cast to have the a predetermined curvature
in the length direction using the roll bending process.
[00170] Hereinafter, with reference to FIG. 14, a roll
15 formed member 20 of the related art illustrated in FIG. 8 and
a roll formed member 20 of the present disclosure will be
compared to be described.
[00171] First, FIG. 14A is a view contrasting a cross
section of the roll formed member 20 combined with a structural
20 member 5 of the related art illustrated in FIG. 8 and a cross
section of the roll formed member 20 combined with a structural
member 5 of the present disclosure illustrated in FIG. 11.
[00172] FIG. 14 is a view contrasting the cross section
of the roll formed member 20 of the related art illustrated in
25 FIG. 8 and the cross section of the roll formed member 20 of
Page 41
the present disclosure illustrated in FIG. 11.
[00173] As such, as illustrated in FIG. 14, in the case
of the roll formed member 20 according to an exemplary
embodiment illustrated in FIG. 12, an area of a cross section
5 thereof is significantly reduced as compared with that of a
cross section of the roll formed member 20 of the related art
illustrated in FIG. 8, so that the roll formed member 20 disposed
in a bonding portion of the structural member 5 may secure
sufficient load bearing performance, and the area of a cross
10 section of the roll formed member 20 is decreased. Thus,
manufacturing expenses of the roll formed member 20 may be
decreased.
[00174] With reference to FIG. 14, it can be confirmed
that a first area S1, a disposition area of the roll formed member
15 20 according to an exemplary embodiment illustrated in FIG. 11
is significantly different from a second area S2, a disposition
area of the roll formed member 20 of the related art illustrated
in FIG. 8, in terms of a cross section.
[00175] As illustrated in FIG. 15, a pillar body
20 portion 300 may include a first body portion panel 330, a second
body portion panel 350, a first closed cross-sectional portion
311, and a second closed cross-sectional portion 312.
[00176] In the case of the roll formed member 20, the
first body portion panel 350 is extended from the second
25 connection bonding portion 430 to be formed, an end portion of
Page 42
the second body portion panel 350 is bent, the second closed
cross-sectional portion 312 and the first closed cross section
311 are consecutively formed. In addition, the first body
portion panel 330 is formed after the first closed
5 cross-sectional portion 311 and the second closed
cross-sectional portion 312 are formed, and then the first
connection bonding portion 410 may be formed after being bent
at 90° while being extended in a direction of the first body
portion panel 330 along a side surface of the second closed
10 cross-sectional portion 312.
[00177] FIGS. 16 to 19 are views of a roll formed member
of the present disclosure having various exemplary embodiments.
[00178] With reference to FIGS. 16 and 17, a roll
formed body portion 300 may form a multiple-closed
15 cross-sectional structure including a plurality of closed
cross-sectional portions 310, at least a portion of corners of
which are formed to have an arc form.
[00179] An even number of closed cross-sectional
portions 310 are consecutively formed in the roll formed body
20 portion 300, while at least a portion of corners of respective
closed cross-sectional portions 310 may be provided to have a
curved shape.
[00180] In this case, three corners among four corners
of respective closed cross-sectional portions 310 are formed
25 to be curved, while each of curved corners may be roll formed
Page 43
to have the arc shape.
[00181] With reference to FIG. 16, in the case of the
closed cross-sectional portion 310 formed in the roll formed
body portion 300, two closed cross-sectional portions 310 are
5 consecutively formed. Each of the two closed cross-sectional
portions 310 may include a figure-8 type cross section having
a curved shape.
[00182] As illustrated in FIG. 17A, the figure-8 type
cross section including the two closed cross-sectional portions
10 310 may be consecutively formed in a horizontal direction, or
may be consecutively formed in a vertical direction to form the
roll formed body portion 300 as illustrated in FIG. 17B.
[00183] As such, depending on a level and a direction
of load on a roll formed member 20, the closed cross-sectional
15 portions 310 may be formed to be overlapped, thereby improving
load bearing performance.
[00184] With reference to FIGS. 18 and 19, the roll
formed body portion 300 may form the multiple-closed
cross-sectional structure including a plurality of closed
20 cross-sectional portions 310 formed to have a quadrangular
cross-sectional shape.
[00185] With reference to FIGS. 18 and 19, an even
number of closed cross-sectional portions 310 may be
consecutively formed in the roll formed body portion 300. At
25 least a portion of corners of respective closed cross-sectional
Page 44
portions 310 may be provided to have an angular shape.
[00186] In this case, respective closed
cross-sectional portions 310 may be roll formed to have a
quadrangular cross-sectional shape, four corners of which are
5 formed to be angular.
[00187] As illustrated in FIG. 19A, the figure-8 type
cross section including the two closed cross-sectional portions
310 may be consecutively formed in the horizontal direction,
or may be consecutively formed in the vertical direction to form
10 the roll formed body portion 300 as illustrated in FIG. 19B.
[00188] However, the closed cross-sectional portion
310 may have any type of polygonal cross section that may improve
load bearing performance of the roll formed member 20.
[00189] The roll formed member 20 may be configured
15 to improve structural performance supporting load in a
connection portion of various structural members 5.
[00190] In detail, the roll formed member 20 may be
applied to various products, such as an impact carrier, a bumper,
a frame, a pillar member, or the like, improving structural
20 performance of a vehicle.
[00191] While exemplary embodiments have been shown
and described above, it will be apparent to those skilled in
the art that modifications and variations could be made without
departing from the scope of the present invention as defined
25 by the appended claims.

【WE CLAIM:】
【Claim 1】
A pillar member of a vehicle, comprising:
5 a pillar body portion having at least one closed
cross-sectional portion; and
a connection bonding portion disposed on opposing side
surfaces of the pillar body portion and consecutively cast to
be connected to the pillar body portion, in order to be combined
10 with a vehicle frame,
wherein the connection bonding portion includes a first
connection bonding portion disposed on one side of the pillar
body portion and a second connection bonding portion disposed
on the other side of the pillar body portion to oppose the first
15 connection bonding portion, and the pillar body portion is
consecutively cast using a roll forming method in a section
between the first connection bonding portion and the second
connection bonding portion, thereby forming an even number of
closed cross-sectional portions.
20
【Claim 2】
A pillar member of a vehicle, comprising:
a pillar body portion having at least one closed
cross-sectional portion; and
25 a connection bonding portion disposed on opposing side
Page 46
surfaces of the pillar body portion and combined with a vehicle
frame,
wherein the connection bonding portion includes a first
connection bonding portion disposed on one side of the pillar
5 body portion and a second connection bonding portion disposed
on the other side of the pillar body portion to oppose the first
connection bonding portion, and the pillar body portion is
consecutively cast using a roll forming method in a section
between the first connection bonding portion and the second
10 connection bonding portion to include a first closed
cross-sectional portion and a second closed cross-sectional
portion, having a figure-8 type cross section.
【Claim 3】
15 A pillar member of a vehicle, comprising:
a pillar body portion having at least one closed
cross-sectional portion; and
a connection bonding portion disposed on opposing side
surfaces of the pillar body portion and combined with a vehicle
20 frame,
wherein the connection bonding portion includes a first
connection bonding portion disposed on one side of the pillar
body portion and a second connection bonding portion disposed
on the other side of the pillar body portion to oppose the first
25 connection bonding portion, and the pillar body portion
Page 47
includes a first body portion panel formed to be extended from
the first connection bonding portion; a second body portion
panel formed to be extended from the second connection bonding
portion; a first closed cross-sectional portion connected to
5 the first body portion panel and consecutively roll formed; and
a second closed cross-sectional portion having one side
connected to the first closed cross-sectional portion and the
other side connected to the second body portion panel to be
consecutively roll formed.
10
【Claim 4】
The pillar member of a vehicle of claim 3, wherein among
portions of the first body portion panel and the second body
portion panel overlapping a member forming the first closed
15 cross-sectional portion and the second closed cross-sectional
portion, at least two portions are lap welded.
【Claim 5】
The pillar member of a vehicle of any claim among claims
20 1 to 3, wherein the connection bonding portion is welded to the
at least one closed cross-sectional portion disposed closest
to the connection bonding portion.
【Claim 6】
25 The pillar member of a vehicle of any claim among claims
Page 48
1 to 3, wherein at least the pillar body portion between the
pillar body portion and the connection bonding portion is
configured using a material selected from among martensitic
steel, complex phase (CP) steel, dual phase (DP) steel,
5 transformation induced plasticity (TRIP) steel, and twinning
induced plasticity (TWIP) steel, having strength of 980 MPa or
higher.
【Claim 7】
10 A pillar member of a vehicle, comprising:
a pillar body portion having at least one closed
cross-sectional portion; and
a connection bonding portion disposed on opposing side
surfaces of the pillar body portion and combined with a vehicle
15 frame,
wherein the pillar body portion and the connection bonding
portion are consecutively cast using a single roll forming
process.
20 【Claim 8】
The pillar member of a vehicle of any claim among claims
1 to 3, wherein the pillar body portion has a multiple-closed
cross-sectional structure including a plurality of closed
cross-sectional portions formed to have a triangular
25 cross-sectional shape or a quadrangular cross-sectional shape.
Page 49
【Claim 9】
The pillar member of a vehicle of any claim among claims
1 to 3, wherein the connection bonding portion is disposed on
5 a portion of the opposing side surfaces of the pillar body
portion in a length direction.
【Claim 10】
The pillar member of a vehicle of any claim among claims
10 1 to 3, wherein the pillar body portion and the connection
bonding portion are formed at an interface between a windshield
and a side window of the vehicle frame in a length direction
【Claim 11】
15 A roll formed member, comprising:
a roll formed body portion having at least one closed
cross-sectional portion; and
a connection bonding portion disposed on at least one side
of the roll formed body portion and combined with a structural
20 member,
wherein the roll formed body portion and the connection
bonding portion are integrally cast using a roll forming method.
【Claim 12】
Page 50
The roll formed member of claim 11, wherein the connection
bonding portion comprises a first connection bonding portion
disposed on one side of the roll formed body portion and a second
connection bonding portion disposed on the other side of the
5 roll formed body portion to oppose the first connection bonding
portion.
【Claim 13】
The roll formed member of claim 12, wherein the roll formed
10 body portion is consecutively cast in a section between the
first connection bonding portion and the second connection
bonding portion using the roll forming method, in order to form
an even number of closed cross-sectional portions.
15 【Claim 14】
The roll formed member of claim 12, wherein the roll formed
body portion is consecutively cast in a section between the
first connection bonding portion and the second connection
bonding portion using the roll forming method, in order to
20 provide a first closed cross-sectional portion and a second
closed cross-sectional portion, having a figure-8 type cross
section.
【Claim 15】
25 The roll formed member of claim 12, wherein the roll formed
Page 51
body portion comprises a first body portion panel formed to be
extended from the first connection bonding portion; a second
body portion panel formed to be extended from the second
connection bonding portion; a first closed cross-sectional
5 portion connected to the first body portion panel and
consecutively roll formed; and a second closed cross-sectional
portion having one side connected to the first closed
cross-sectional portion and the other side connected to the
second body portion panel and consecutively roll formed.
10
【Claim 16】
The roll formed member of claim 15, wherein among portions
of the first body portion panel and the second body portion panel
overlapping a member forming the first closed cross-sectional
15 portion and the second closed cross-sectional portion, at least
two portions are lap welded.
【Claim 17】
The roll formed member of any claim among claims 11 to
20 15, wherein the connection bonding portion is welded to the at
least one closed cross-sectional portion disposed closest to
the connection bonding portion.
【Claim 18】
25 The roll formed member of any claim among claims 11 to
Page 52
15, wherein at least the roll formed body portion between the
roll formed body portion and the connection bonding portion may
be configured using a material selected from among martensitic
steel, CP steel, DP steel, TRIP steel, and TWIP steel, having
5 strength of 980 MPa or higher.
【Claim 19】
The roll formed member of any claim among claims 11 to
15, wherein the roll formed body portion has a multiple-closed
10 cross-sectional structure including a plurality of closed
cross-sectional portions formed to have a triangular
cross-sectional shape or a quadrangular cross-sectional shape.
【Claim 20】
15 The roll formed member of any claim among claims 11 to
15, wherein the connection bonding portion is formed on a
portion of opposing side surfaces of the roll formed body
portion in a length direction.