TECHNICAL FIELD
[0001]
The present disclosure relates to a die, more specifically, a die used for hot
pressing.
BACKGROUND ART
[0002]
As a method for forming high-strength parts such as automobile body parts,
hot pressing has been known. In the hot pressing, a heated blank is pressed with
dies attached to a press machine, and thereafter the formed article is cooled and
quenched in the dies. The formed article is cooled, for example, by refrigerant
ejected from the forming surface of a die.
[0003]
Patent Literature 1 discloses a die having a refrigerant ejection function. In
this die, a plurality of refrigerant supply tubes that pass through the inside and open
at the forming surface are located. Each of the refrigerant supply tubes is provided
with an opening/closing valve, a flow rate regulating valve, and a pressure regulating
valve. By controlling these valves, parameters such as an ejection amount, an
ejection flow rate, an ejection pressure, an ejection time, an ejection timing, and the
like of the refrigerant from the refrigerant supply tubes are controlled.
[0004]
In the die of Patent Literature 1, valves for controlling the ejection of the
refrigerant are provided in each of the refrigerant supply tubes. Therefore, when
cooling the formed article, it is necessary to control the plurality of valves at the
same time, thus the problem is that the ejection control of refrigerant is complicated.
[0005]
On the other hand, the die disclosed in Patent Literature 2 includes a die body
including a forming surface and a refrigerant container to be housed inside the die
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body. The die body is provided with a plurality of die supply holes that open at the
forming surface. A plurality of container supply holes are provided on the wall
portion of the refrigerant container. As a result of the refrigerant container being
moved up and down or rotated in the die body, each of the container supply holes
and a die supply hole are brought into a communication state or a noncommunication
state. When the container supply hole and the die supply hole come
into communication with each other, the refrigerant is supplied from the refrigerant
container to the formed article on the forming surface through the container supply
hole and the die supply hole.
CITATION LIST
PATENT LITERATURE
[0006]
Patent Literature 1: Japanese Patent Application Publication No. 2006-198666
Patent Literature 2: Japanese Patent Application Publication No. 2007-136535
SUMMARY OF INVENTION
TECHNICAL PROBLEM
[0007]
In the die of Patent Literature 2, by bringing the container supply hole and the
die supply hole into communication by moving up and down or rotating the
refrigerant container, it is possible to supply refrigerant to the formed article without
performing complicated ejection control by a plurality of valves. However, in
Patent Literature 2, since the refrigerant container is disposed inside the die body, it
is necessary to form a cavity inside the die body. Therefore, the problem is that the
strength of the die decreases.
[0008]
An objective of the present disclosure is to provide a die that can secure
strength and easily supply refrigerant to a formed article.
SOLUTION TO PROBLEM
[0009]
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The die according to the present disclosure includes a die base, a die body,
and an opening/closing member. In the die base, a storage portion for storing
refrigerant is formed. The die body is mounted to the die base. The die body
includes a mounting surface, a forming surface, and a plurality of flow channels.
The mounting surface is located on the storage portion side of the die base. The
forming surface is located on the opposite side to the mounting surface. The
plurality of flow channels pass through the die body from the mounting surface
toward the forming surface. The opening/closing member is disposed between the
die base and the die body. The opening/closing member includes a plurality of
through holes corresponding to the plurality of flow channels. The opening/closing
member is configured to be movable with respect to the die base and the die body
such that each of the through holes brings the corresponding flow channel and the
storage portion into communication.
ADVANTAGEOUS EFFECTS OF INVENTION
[0010]
The die according to the present disclosure can secure strength and easily
supply refrigerant to a formed article.
BRIEF DESCRIPTION OF DRAWINGS
[0011]
[FIG. 1] FIG. 1 is a schematic diagram showing a press machine.
[FIG. 2] FIG. 2 is an exploded view of a die according to a first embodiment.
[FIG. 3] FIG. 3 is a sectional view in a plane perpendicular to the longitudinal
direction of the die in a non-communication state.
[FIG. 4] FIG. 4 is a schematic diagram for explaining overlapping between a through
hole of an opening/closing member and a flow channel of a die body in a noncommunication
state.
[FIG. 5] FIG. 5 is a sectional view in a plane perpendicular to the longitudinal
direction of the die in a communication state.
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[FIG. 6] FIG. 6 is a schematic diagram for explaining overlapping between a through
hole of the opening/closing member and a flow channel of the die body in a
communication state.
[FIG. 7] FIG. 7 is a schematic diagram for explaining overlapping between a through
hole and a flow channel, which have different widths from each other in the sliding
direction.
[FIG. 8] FIG. 8 is a schematic diagram for explaining overlapping between a through
hole and a flow channel, which have different widths from each other in the sliding
direction.
[FIG. 9] FIG. 9 is a schematic diagram for explaining overlapping between a through
hole and a flow channel, which have different widths from each other in the sliding
direction.
[FIG. 10] FIG. 10 is a schematic diagram for explaining overlapping between a
through hole and a flow channel, which have different widths from each other in a
direction perpendicular to the sliding direction.
[FIG. 11] FIG. 11 is a schematic diagram for explaining overlapping between a
through hole and a flow channel, which have different widths from each other in a
direction perpendicular to the sliding direction.
[FIG. 12] FIG. 12 is a schematic diagram for explaining overlapping between a
through hole and a flow channel, which have different widths from each other in the
sliding direction and a direction perpendicular to the sliding direction.
[FIG. 13] FIG. 13 is a schematic diagram for explaining overlapping between a
through hole and a flow channel, which have different widths from each other in the
sliding direction and a direction perpendicular to the sliding direction.
[FIG. 14] FIG. 14 is a schematic diagram for explaining overlapping between a
through hole and a flow channel, which have different widths from each other in the
sliding direction and a direction perpendicular to the sliding direction.
[FIG. 15] FIG. 15 is a sectional view in a plane perpendicular to the longitudinal
direction of a die according to a second embodiment.
[FIG. 16] FIG. 16 is a schematic diagram for explaining overlapping between a
through hole of the opening/closing member and a flow channel of the die body in
the second embodiment.
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[FIG. 17] FIG. 17 is a schematic diagram for explaining overlapping between a
through hole of the opening/closing member and a flow channel of the die body in
the second embodiment.
[FIG. 18] FIG. 18 is a schematic diagram for explaining overlapping between a
through hole of the opening/closing member and a flow channel of the die body in
the second embodiment.
[FIG. 19] FIG. 19 is a schematic diagram for explaining overlapping between a
through hole of the opening/closing member and a flow channel of the die body in
the second embodiment.
[FIG. 20] FIG. 20 is a schematic diagram for explaining overlapping between a
through hole of the opening/closing member and a flow channel of the die body in
another example of the second embodiment.
[FIG. 21] FIG. 21 is a schematic diagram for explaining overlapping between a
through hole of the opening/closing member and a flow channel of the die body in
another example of the second embodiment.
[FIG. 22] FIG. 22 is a schematic diagram for explaining overlapping between a
through hole of the opening/closing member and a flow channel of the die body in
another example of the second embodiment.
[FIG. 23] FIG. 23 is a schematic diagram for explaining overlapping between a
through hole of the opening/closing member and a flow channel of the die body in
another example of the second embodiment.
[FIG. 24] FIG. 24 is a schematic diagram showing another example of the
opening/closing member.
[FIG. 25] FIG. 25 is a sectional view in a plane perpendicular to the longitudinal
direction of the die in another example of the embodiments.
DESCRIPTION OF EMBODIMENTS
[0012]
The die according to an embodiment includes a die base, a die body, and an
opening/closing member. In the die base, a storage portion for storing refrigerant is
formed. The die body is mounted to the die base. The die body includes a
mounting surface, a forming surface, and a plurality of flow channels. The
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mounting surface is located on the storage portion side of the die base. The forming
surface is located on the opposite side to the mounting surface. The plurality of
flow channels pass through the die body from the mounting surface toward the
forming surface. The opening/closing member is disposed between the die base and
the die body. The opening/closing member includes a plurality of through holes
corresponding to the plurality of flow channels. The opening/closing member is
configured to be movable with respect to the die base and the die body such that each
of the through holes brings the corresponding flow channel and the storage portion
into communication (first configuration).
[0013]
In the first configuration, the storage portion for storing refrigerant is formed
in the die base. Therefore, since it is not necessary to provide a large cavity for
storing refrigerant in the die body including the forming surface, the strength of the
die can be secured. Further, in the first configuration, an opening/closing member
is disposed between the die base and the die body. A plurality of through holes are
formed in the opening/closing member corresponding to the plurality of flow
channels provided in the die body. In order to bring the flow channels of the die
body and the storage portion of the die base into communication, simply this
opening/closing member may be moved. In other words, moving the
opening/closing member will result in communication between each flow channel of
the die body and the storage portion of the die base through the plurality of through
holes provided in the opening/closing member so that the refrigerant in the storage
portion is ejected from the forming surface through each flow channel of the die
body. Therefore, according to the first configuration, it is possible to easily supply
refrigerant to a formed article without performing complicated control by a plurality
of valves.
[0014]
In the first configuration, it is preferable that the opening/closing member has
a plate shape and is slidable with respect to the die base and the die body (second
configuration).
[0015]
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According to the second configuration, by sliding the plate-shaped
opening/closing member, it is possible to move all through holes, thereby bringing
the plurality of flow channels of the die body and the storage portion of the die base
into communication. Further, since the plurality of through holes can be efficiently
provided on one opening/closing member, it is possible to efficiently perform
ejection control of refrigerant from the plurality of flow channels.
[0016]
In the second configuration, the plurality of through holes may include a first
through hole and a second through hole. In the sliding direction of the
opening/closing member, and/or a direction perpendicular to the sliding direction, the
width of the second through hole is larger than the width of the first through hole
(third configuration).
[0017]
The time for which a flow channel of the die body and the storage portion of
the die base are in communication, that is, the time for which refrigerant from the
storage portion is supplied to the formed article through the flow channel, is
determined mainly according to the width of the corresponding through hole in the
sliding direction of the opening/closing member. The flow rate per unit time of the
refrigerant supplied to the formed article is mainly determined according to the width
of the through hole in the direction perpendicular to the sliding direction of the
opening/closing member. According to the third configuration, the width in the
sliding direction and/or a direction perpendicular to the sliding direction is different
between the first through hole and the second through hole. Therefore, the supply
time of the refrigerant and/or the flow rate per unit time of the supplied refrigerant
can be changed between the flow channel corresponding to the first through hole and
the flow channel corresponding to the second through hole. Therefore, it is possible
to appropriately set the cooling time, cooling speed, and the like for each region of
the formed article.
[0018]
In the second or third configuration, the opening/closing member may slide in
two axial directions with respect to the die base and the die body (fourth
configuration).
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[0019]
In a case in which the plate-shaped opening/closing member slides only in a
single axial direction, when the communication state and the non-communication
state between the flow channel of the die body and the storage portion of the die base
are switched, the opening/closing member is simply moved back and forth. For
example, when the opening/closing member is slid to one side in the above described
axial direction, the through hole of the opening/closing member overlaps the flow
channel of the die body, and the flow channel and the storage portion are brought
into a communication state. If the opening/closing member is further slid, the
through hole of the opening/closing member passes the flow channel of the die body,
and deviates from the flow channel so that the flow channel and the storage portion
are brought into a non-communication state. Thereafter, since the opening/closing
member follows the same path to return to the original position, the flow channel and
the storage portion are brought into a communication sate again until the
opening/closing member returns to the original position. In contrast to this,
according to the fourth configuration, since the opening/closing member which has
been slid in one axial direction and has reached the end point via a communication
state and a non-communication state can be slid in another axial direction, the
opening/closing member can be returned to its original position in a path different
from the outbound path. Therefore, it is possible to prevent the flow channel and
the storage portion, which has once been brought into a non-communication state,
from being brought into a communication state again. In other words, the
opening/closing member can be returned to the initial position while stopping the
supply of refrigerant to the formed article.
[0020]
In any of the first to fourth configurations, the die base may have a plurality
of grooves at the surface. The plurality of grooves are in communication with each
other and configure the storage portion (fifth configuration).
[0021]
According to the fifth configuration, the storage portion is configured by a
plurality of grooves provided at the surface of the die base. Therefore, for example,
the storage amount of refrigerant in the storage portion can be reduced compared
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with the case where the storage portion is a single concave portion. Therefore, in
particular, when supply of refrigerant to the storage portion is started in a state in
which the storage portion is not filled with refrigerant, it is possible to reduce the
time from when supply of refrigerant to the storage portion of the die base is started
until when the refrigerant is stored in the storage portion allowing the refrigerant to
flow into each flow channel of the die body. Further, by configuring the storage
portions by the plurality of grooves being in communication with each other, it is
possible to integrate piping systems to be connected to the die base, thereby allowing
the diameter of the pipe connected to the die base to be expanded. Therefore, the
pressure loss of the refrigerant to be supplied to the storage portion can be
suppressed. Furthermore, it is possible to compensate for the decrease in the flow
rate of refrigerant in the communication portion between the flow channel and the
storage portion of the die body, and the flow rate of refrigerant ejected from the
forming surface through the flow channel can be stabilized.
[0022]
Hereinafter, embodiments of the present disclosure will be described with
reference to the drawings. The same or equivalent configuration is given the same
reference signal in each figure, and the same description will not be repeated.
[0023]

[Configuration of press machine 100]
FIG. 1 is a schematic diagram showing a press machine 100. The press
machine 100 is provided with dies 10 and 20. FIG. 1 is a diagram to show the press
machine 100 viewed from the front. In the present embodiment, the direction
perpendicular to the paper surface of FIG. 1 is referred to as a depth direction of the
press machine 100.
[0024]
The press machine 100 includes a main body frame 30, a slide 40, a bolster 50,
and a base plate 60.
[0025]
The slide 40 is mounted to the main body frame 30. The slide 40 moves up
and down with respect to the main body frame 30 by operation of a hydraulic
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cylinder, a flywheel, or the like housed in the main body frame 30. The slide 40
holds the die 20.
[0026]
The bolster 50 is disposed below the slide 40. The base plate 60 is fixed
onto the bolster 50. The base plate 60 has a concave shape. The die 10 is
mounted to the base plate 60. The base plate 60 adjusts the position of the die 10 in
the vertical direction. The die 10 faces the die 20.
[0027]
The die 10 extends in the depth direction of the press machine 100.
Hereinafter, with respect to the die 10, the depth direction of the press machine 100
is referred to as the longitudinal direction, and the direction perpendicular to the
longitudinal direction and the vertical direction is referred to as a lateral direction.
FIG. 2 is an exploded view of the die 10. The die 10 includes a die body 11, a die
base 12, and an opening/closing member 13.
[0028]
The die body 11 includes a forming surface 111 and a mounting surface 112.
The forming surface 111 is the upper surface of the die body 11. The mounting
surface 112 is located on the opposite side of the forming surface 111. In other
words, the mounting surface 112 is the lower surface of the die body 11. The
mounting surface 112 is generally flat.
[0029]
In the present embodiment, the die body 11 has an approximate hat shape as
viewed from the longitudinal direction. In other words, the die body 11 includes a
punch part 11A and flange parts 11B.
[0030]
The punch part 11A is disposed at the middle in the lateral direction of the die
body 11. The punch part 11A includes a top surface 11Aa and side surfaces 11Ab.
The side surfaces 11Ab are located on both sides of the top surface 11Aa. Each of
the side surfaces 11Ab is inclined with respect to the vertical direction outward in the
lateral direction as they are closer to the bottom from the top surface 11Aa. On the
lower surface of the die 20 (FIG. 1), a concave portion corresponding to the punch
part 11A is formed.
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[0031]
Each flange part 11B protrudes outward in the lateral direction from the
punch part 11A. The upper surface 11Ba of the flange part 11B is connected to the
lower end of the side surface 11Ab of the punch part 11A. The top surface 11Aa
and the side surfaces 11Ab of the punch part 11A, and the upper surface 11Ba of
each flange part 11B constitute the forming surface 111 of the die body 11.
[0032]
FIG. 3 is a cross-section (a sectional view in a plane perpendicular to the
longitudinal direction) of the die 10. Referring to FIG. 3, the die body 11 further
includes a plurality of flow channels 113. In the example of the present
embodiment, the plurality of flow channels 113 are arranged at equal intervals in the
longitudinal direction in the die body 11. Further, the flow channels 113 are also
arranged at equal intervals in the lateral direction of the die body 11. However, the
plurality of flow channels 113 may not be arranged at equal intervals in the
longitudinal or lateral direction of the die body 11. Each of the flow channels 113
passes through the die body 11 from the mounting surface 112 to the forming surface
111. The flow channel 113 extends in the vertical direction in the die body 11.
The flow channel 113 may include a branch flow channel 1131 extending in the
lateral direction. The lower end of the flow channel 113 opens at the mounting
surface 112. The upper end 1132 of the flow channel 113 and the front end 1133 of
the branch flow channel 1131 open at the forming surface 111.
[0033]
More specifically, the upper ends 1132 of the flow channels 113 open at the
top surface 11Aa of the punch part 11A and the upper surfaces 11Ba of the flange
parts 11B. The front end 1133 of the branch flow channel 1131 opens at the side
surface 11Ab of the punch part 11A. The sectional shape of each flow channel 113
is, for example, circular. However, the flow channel 113 may have a sectional
shape other than a circle. The sectional area of each flow channel 113 may be
different from or the same as each other. For example, the sectional area of the
flow channel 113 in the punch part 11A is larger than the sectional area of the flow
channel 113 in the flange part 11B. Each branch flow channel 1131 is provided in a
flow channel 113 located near either of the side surfaces 11Ab, among the flow
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channels 113 in the punch part 11A. The sectional area of each branch flow
channel 1131 may also be different from or the same as each other.
[0034]
A plurality of flow channels 114 separate from the flow channels 113 are also
formed in the die body 11. In the example of the present embodiment, the plurality
of flow channels 114 are arranged at equal intervals in the longitudinal direction in
the die body 11. Further, the flow channels 114 are also arranged at equal intervals
in the lateral direction of the die body 11. However, the plurality of flow channels
114 may not be arranged at equal intervals in the longitudinal direction or the lateral
direction of the die body 11. Each of the flow channels 114 passes through the die
body 11 from the mounting surface 112 toward the forming surface 111. The flow
channel 114 extends in the vertical direction in the die body 11. The flow channel
114 may include a branch flow channel 1141 extending in the lateral direction. The
lower end of the flow channel 114 opens at the mounting surface 112. The upper
end 1142 of the flow channel 114 and the front end 1143 of the branch flow channel
1141 open at the forming surface 111.
[0035]
More specifically, the upper ends 1142 of the flow channels 114 open at the
top surface 11Aa of the punch part 11A and the upper surfaces 11Ba of the flange
parts 11B. The front end 1143 of the branch flow channel 1141 opens at the side
surface 11Ab of the punch part 11A. The sectional shape of each flow channel 114
is, for example, circular. However, the flow channel 114 may have a sectional
shape other than a circle. The sectional area of each flow channel 114 may be
different from or the same as each other. For example, the sectional area of the
flow channel 114 in the punch part 11A is larger than the sectional area of the flow
channel 114 in the flange part 11B. The branch flow channel 1141 is provided in a
flow channel 114 in the punch part 11A. The sectional area of each branch flow
channel 1141 may also be different from or the same as each other.
[0036]
The die base 12 is disposed below the die body 11. The die body 11 is
mounted to the die base 12. The die base 12 has a substantially cuboid shape. A
concave-shaped storage portion 122 is formed at the surface 121 on the die body 11
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side of the die base 12. The refrigerant is stored in the storage portion 122. At the
surface opposite to the surface 121, a concave-shaped discharge portion 123 is
formed in order to discharge the refrigerant after use. The die base 12 also has a
through path 126 extending from the discharge portion 123 toward the surface 121.
[0037]
Referring to FIG. 2 again, the die base 12 has a plurality of grooves 124 and
125 configuring the storage portion 122, at the surface 121. The plurality of
grooves 124 respectively extend in the longitudinal direction, viewed from above,
that is, in a plan view of the die base 12. In the example of the present embodiment,
the grooves 124 are located in parallel to each other. However, each groove 124
may be inclined with respect to other grooves 124. FIG. 2 shows a case where the
storage portion 122 has seven grooves 124. The grooves 124 are located, for
example, at equal intervals in the lateral direction. However, the grooves 124 may
be located at unequal intervals. The width, depth, and length of each groove 124
are preferably the same. One ends of the grooves 124 are connected by a groove
125 extending in the lateral direction. The other ends of the grooves 124 are
connected by another groove 125 extending in the lateral direction. In other words,
the plurality of grooves 124 and 125 are in communication with each other.
[0038]
The storage portion 122 is disposed at the middle part in the longitudinal
direction at the surface 121 of the die base 12. The middle part is slightly recessed
compared with other portions.
[0039]
The opening/closing member 13 is placed on the concave-shaped middle part
at the surface 121 of the die base 12. The opening/closing member 13 has a solid
plate-shape. The opening/closing member 13 has, for example, a substantially
rectangular shape in a plan view. The opening/closing member 13 is a member
separate from the die body 11, and is disposed outside the die body 11. More
specifically, the opening/closing member 13 is disposed between the die base 12 and
the die body 11. The opening/closing member 13 is sandwiched by the mounting
surface 112 of the die body 11 and the surface (upper surface) 121 of the die base 12.
It is preferable that a sealant not shown is disposed between the lower surface of the
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opening/closing member 13 and the surface 121 of the die base 12, and between the
upper surface of the opening/closing member 13 and the mounting surface 112 of the
die body 11.
[0040]
The opening/closing member 13 includes a plurality of through holes 131 and
a plurality of through holes 132. The plurality of through holes 131 are arranged in
the longitudinal direction and the lateral direction of the die 10. The plurality of
through holes 132 are also arranged in the longitudinal direction and the lateral
direction of the die 10. In the example of the present embodiment, a through hole
132 is arranged between longitudinal rows and between lateral rows of the through
holes 131. The through holes 132 are located so as to be deviated in position from
the through holes 131 in the longitudinal direction and the lateral direction.
However, the arrangement of the through holes 131 and 132 is not limited to this and
can be determined appropriately.
[0041]
The plurality of through holes 131 are formed in the opening/closing member
13 corresponding to the plurality of flow channels 113 (FIG. 3) of the die body 11.
For example, the through holes 131 are arranged at the same interval as that of the
flow channels 113 in the longitudinal direction of the die 10. For example, the
through holes 131 are arranged at the same interval as that of the flow channels 113
even in the lateral direction of the die 10. In the present embodiment, the number
of through holes 131 is the same as that of flow channels 113. However, the
number of through holes 131 may be different from the number of flow channels 113.
[0042]
The plurality of through holes 132 are formed in the opening/closing member
13 corresponding to the plurality of flow channels 114 (FIG. 3) of the die body 11.
For example, the through holes 132 are arranged at the same interval as that of the
flow channels 114 in the longitudinal direction of the die 10. For example, the
through holes 132 are arranged at the same interval as that of the flow channels 114
even in the lateral direction of the die 10. In the present embodiment, the number
of through holes 132 is the same as that of flow channels 114. However, the
number of through holes 132 may be different from the number of flow channels 114.
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Each of the through holes 132 brings the corresponding flow channel 114 and the
discharge portion 123 of the die base 12 into communication.
[0043]
In the example of the present embodiment, each of the through holes 131 and
132 has a circular shape. However, each of the through holes 131 and 132 may not
have a circular shape. Each of the through holes 131 and 132 may have, for
example, a semi-circular, elliptic, semi-elliptic, or polygonal shape. Further, the
opening area of each of the through holes 131 and 132 may be different from or the
same as each other.
[0044]
The opening/closing member 13 is configured to be movable with respect to
the die base 12 and the die body 11 such that each of the through holes 131 brings
the corresponding flow channel 113 and the storage portion 122 into communication.
A driving unit 133 is mounted to the opening/closing member 13. For example, the
driving unit 133 is an actuator such as a hydraulic cylinder, an electric slider, or the
like. The driving unit 133 causes the opening/closing member 13 to slide in the
lateral direction.
[0045]
[Operation of press machine 100]
Next, the operation of a press machine 100 when producing a formed article
will be described. Referring to FIG. 1, first, a heated blank (not illustrated) is
placed on the die 10. Next, the die 20 is lowered by lowering the slide 40.
Thereby, the blank is pressed by the die 20 and the die 10. After the die 20 reaches
the bottom dead center, refrigerant is ejected from the forming surface of the die 10,
and the formed article (not illustrated) is cooled in the dies 10 and 20.
[0046]
Referring to FIGS. 3 to 6, the operation of the die 10 when cooling the formed
article will be described. FIGS. 3 and 4 are diagrams showing the positional
relationship between the die body 11 and the die base 12, and the opening/closing
member 13 before the start of cooling. FIGS. 5 and 6 are diagrams showing the
positional relationship between the die body 11 and the die base 12, and the
opening/closing member 13 during cooling. In FIG. 6, the original position of the
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opening/closing member 13 is shown by a phantom line. FIGS. 3 and 5 are crosssectional
views of the die 10. FIGS. 4 and 6 are diagrams to show the
opening/closing member 13 when viewed from below, in which a part of the
opening/closing member 13 is enlarged to be shown.
[0047]
Referring to FIG. 3, in order to cool the formed article, refrigerant pressure
feeding means provided outside the die 10 is driven, and refrigerant is supplied to the
storage portion 122 to be stored. Examples of the refrigerant pressure feeding
means include a pressure feed pump or cylinder disposed between the storage portion
122 and a refrigerant tank (not illustrated). The refrigerant pressure feeding means
may be a water supply directly connected to the storage portion 122. Further,
refrigerant suction means such as a suction pump (not illustrated) connected to the
discharge portion 123 of the die base 12 is driven. The refrigerant pressure feeding
means and the refrigerant suction means are preferably driven before press working
is started. As a result, before starting cooling of the formed article, the storage
portion 122 is filled with refrigerant and is pressurized, and the discharge portion 123
becomes a negative pressure state.
[0048]
As shown in FIGS. 3 and 4, before starting the cooling of the formed article,
the through holes 131 of the opening/closing member 13 are deviated from the flow
channels 113 of the die body 11. The opening/closing member 13 is disposed such
that each through hole 131 does not overlap the corresponding flow channel 113.
Therefore, a portion other than the through holes 131 of the opening/closing member
13 block the lower ends of the flow channels 113. In other words, the storage
portion 122 of the die base 12 and the flow channels 113 of the die body 11 are not in
communication with each other. Moreover, the discharge portion 123 of the die
base 12 and the flow channels 114 of the die body 11 are not in communication with
each other.
[0049]
In this state, the driving unit 133 is operated to cause the opening/closing
member 13 to slide. In other words, as shown in FIGS. 5 and 6, the opening/closing
member 13 is moved to one side in the sliding direction such that the through holes
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131 of the opening/closing member 13 overlap the flow channels 113 of the die body
11. Thereby, the storage portion 122 of the die base 12 and the flow channels 113
of the die body 11 are brought into communication with each other. At this time,
the through holes 132 of the opening/closing member 13 also overlap the flow
channels 114 of the die body 11. Thereby, the discharge portion 123 and the
through paths 126 of the die base 12 are brought into communication with the flow
channels 114 of the die body 11.
[0050]
In the example shown in FIGS. 4 and 6, the distance in the sliding direction
between each through hole 131 and the corresponding flow channel 113 is constant.
Therefore, the plurality of through holes 131 begin to overlap the corresponding flow
channels 113 at the same timing. Moreover, since the shapes and the areas of the
plurality of through holes 131 are equal to each other, the time and the area at which
each through hole 131 overlaps the flow channel 113 become equal.
[0051]
When the flow channels 113 and the storage portion 122 are brought into
communication, the refrigerant in the storage portion 122 flows into each flow
channel 113 through the through hole 131. The refrigerant flown into the flow
channel 113 is ejected from the upper end 1132 of the flow channel 113 that opens at
the top surface 11Aa of the punch part 11A or the upper surface 11Ba of the flange
part 11B. The refrigerant flown into the flow channel 113 in the punch part 11A
may also be ejected from the front end 1133 of the branch flow channel 1131.
[0052]
The refrigerant ejected from the flow channels 113 and the branch flow
channels 1131 of the die body 11 flows on the forming surface 111. On the forming
surface 111, for example, a large number of fine convex portions are provided at
approximately equal density, and the refrigerant flows between the convex portions.
Thus, the refrigerant is supplied to the formed article and the formed article is cooled.
[0053]
The refrigerant which has cooled the formed article flows into the flow
channels 114 and the branch flow channels 1141 of the die body 11, and flows down
in each flow channel 114. The refrigerant passes through each through hole 132 of
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the opening/closing member 13 and the through path 126 of the die base 12, and
reaches the discharge portion 123, thereafter being discharged to the outside of the
die 10.
[0054]
When stopping the supply of refrigerant to the formed article, the
opening/closing member 13 is moved to the other side in the sliding direction.
Thereby, the opening/closing member 13 is returned from a state in which the
through holes 131 overlap the flow channels 113, and the flow channels 113 and the
storage portion 122 are in communication with each other (FIGS. 5 and 6), to a state
in which the through holes 131 have deviated from the flow channels 113, and the
flow channels 113 and the storage portion 122 are not in communication with each
other (FIGS. 3 and 4). Note that, while the opening/closing member 13 is moving,
the refrigerant pressure feeding means for supplying refrigerant to the storage portion
122 and the refrigerant suction means for sucking the refrigerant from the discharge
portion 123 remain being driven. By leaving the refrigerant pressure feeding means
in a driving state and having the storage portion 122 wait in a state of being filled
with refrigerant, the supply amount of the refrigerant to the flow channels 113 and
the timing at which refrigerant is ejected from the flow channels 113 can be
stabilized.
[0055]
[Advantageous effects]
In the die 10 according to the first embodiment, the storage portion 122 in
which refrigerant is stored is formed at the surface 121 of the die base 12.
Therefore, it is not necessary to provide a cavity for storing refrigerant in the die
body 11. Therefore, the strength of the die 10 can be secured.
[0056]
In the die 10 according to the first embodiment, the opening/closing member
13 having the plurality of through holes 131 formed is disposed between the die base
12 and the die body 11. The through holes 131 of the opening/closing member 13
are arranged, for example, at the equal intervals as that of the flow channels 113 in
the longitudinal direction and the lateral direction. By simply moving the
opening/closing member 13, it is possible to switch a communication state and a
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non-communication state between the flow channels 113 of the die body 11 and the
storage portion 122 of the die base 12. In a communication state, the refrigerant in
the storage portion 122 flows into the flow channels 113 and is ejected from the
forming surface 111. Therefore, according to the die 10, the refrigerant can be
easily supplied from the die 10 to the formed article without performing complicated
control by a plurality of valves.
[0057]
In the first embodiment, the opening/closing member 13 has a plate shape,
and slides in the lateral direction of the die 10. The opening/closing member 13
slides in the horizontal direction with respect to the die body 11 outside the die body
11. By sliding the opening/closing member 13, all through holes 131 formed in the
opening/closing member 13 can be moved, and the plurality of flow channels 113
corresponding to the through holes 131 and the storage portion 122 can be brought
into communication. Therefore, refrigerant can be ejected uniformly from the
plurality of flow channels 113.
[0058]
In the first embodiment, in the opening/closing member 13, each of the
plurality of through holes 131 has a circular shape. However, in the first
embodiment, the plurality of through holes 131 may include through holes having
different shapes from each other.
[0059]
For example, as shown in FIG. 7, the plurality of through holes 131 may
include a circular through hole 131C and an elliptic through hole 131D having a
major diameter in the sliding direction. In the sliding direction, the width (opening
length) Wd of the through hole 131D is larger than the width (opening length) Wc of
the through hole 131C.
[0060]
Referring to FIG. 7, in the initial state, both the through holes 131C and 131D
do not overlap the corresponding flow channels 113C and 113D, and are in noncommunication
state. In the sliding direction, the positions of the ends of the
through holes 131C and the through holes 131D, which are farther from the flow
channels 113C and 113D, correspond to each other. When the opening/closing
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member 13 is slid from this state to one side in the sliding direction, as shown in FIG.
8, the elliptic through hole 131D first overlaps the flow channel 113D, resulting in a
communication state. On the other hand, at this time, the circular through hole
131C does not overlap the flow channel 113C. When the opening/closing member
13 is further slid, as shown in FIG. 9, the through hole 131C also overlaps the flow
channel 113C, resulting in a communication state.
[0061]
When returning the through holes 131C and 131D to a non-communication
state, the opening/closing member 13 is slid to the other side in the sliding direction.
When the opening/closing member 13 is slid to the other side in the sliding direction,
the through hole 131C first deviates from the flow channel 113C, resulting in a noncommunication
state (FIG. 8), and then the through hole 131D deviates from the
flow channel 113D, resulting in a non-communication state (FIG. 7).
[0062]
Thus, since the width Wd in the sliding direction of the through hole 131D is
larger than the width Wc in the sliding direction of the through hole 131C, the time
for which the through hole 131D is overlapping the flow channel 113D is longer than
the time for which the through hole 131C is overlapping the flow channel 113C.
Therefore, the flow channel 113D has a longer communication time with the storage
portion 122 (FIG. 5) than the flow channel 113C. Therefore, it is possible to
increase the supply time of refrigerant from the flow channel 113D to the formed
article.
[0063]
For example, as shown in FIG. 10, in a direction perpendicular to the sliding
direction, the width (opening length) We of the through hole 131E may be larger
than the width (opening length) Wf of the through hole 131F. For example, the
through hole 131E may have a circular shape, and the through hole 131F may have a
semicircular shape.
[0064]
Referring to FIG. 10, in the initial state, both the through holes 131E and
131F do not overlap the corresponding flow channels 113E and 113F, and are in a
non-communication state. The positions in the sliding direction of the through hole
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- 21 -
131E and the through hole 131F coincide with each other. When the
opening/closing member 13 is slid from this state to one side in the sliding direction,
as shown in FIG. 11, the through holes 131E and 131F simultaneously overlap the
flow channels 113E and 113F, resulting in a communication state. When the
opening/closing member 13 is moved to the other side in the sliding direction, the
through holes 131E and 131F simultaneously deviate from the flow channels 113E
and 113F, resulting in a non-communication state (FIG. 10). However, the area in
which the through hole 131E and the flow channel 113E overlap is larger than the
area in which the through hole 131F and the flow channel 113F overlap. Therefore,
the flow rate per unit time of the refrigerant supplied from the flow channel 113E to
the formed article can be increased to more than the flow rate per unit time of the
refrigerant supplied from the flow channel 113F to the formed article.
[0065]
Moreover, for example, as shown in FIG. 12, in the sliding direction, the
width (opening length) Wh1 of the through hole 131H may be larger than the width
(opening length) Wg1 of the through hole 131G. In the direction perpendicular to
the sliding direction, the width (opening length) Wg2 of the through hole 131G may
be larger than the width (opening length) Wh2 of the through hole 131H. For
example, the through hole 131G may have a circular shape, and the through hole
131H may have a semi-elliptic shape.
[0066]
Referring to FIG. 12, in the initial state, both of the through holes 131G and
131H do not overlap the corresponding flow channels 113G and 113H, and are in a
non-communication state. In the sliding direction, the positions of the ends of the
through hole 131G and the through hole 131H, which are farther from the flow
channels 113G and 113H, coincide with each other. When the opening/closing
member 13 is slid from this state to one side in the sliding direction, the through hole
131H first overlaps the flow channel 113H as shown in FIG. 13. On the other hand,
at this time, the through hole 131G does not overlap the flow channel 113G. When
the opening/closing member 13 is further slid, as shown in FIG. 14, the through hole
131G also overlaps the flow channel 113G. When the opening/closing member 13
is slid to the other side in the sliding direction, the through hole 131G first deviates
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- 22 -
from the flow channel 113G, resulting in a non-communication state (FIG. 13), and
then the through hole 131H deviates from the flow channel 113H, resulting in a noncommunication
state (FIG. 12).
[0067]
Since the width Wh1 in the sliding direction of the through hole 131H is
larger than the width Wg1 in the sliding direction of the through hole 131G, the flow
channel 113H has a longer communication time with the storage portion 122 (FIG. 5)
than the flow channel 113G. Therefore, it is possible to increase the supply time of
refrigerant from the flow channel 113H to the formed article. On the other hand,
the area where the through hole 131G and the flow channel 113G overlap is larger
than the area where the through hole 131H and the flow channel 113H overlap.
Therefore, the flow rate per unit time of the refrigerant supplied from the flow
channel 113G to the formed article can be increased to more than the flow rate per
unit time of the refrigerant supplied from the flow channel 113H to the formed article.
[0068]
Thus, at each through hole 131 of the opening/closing member 13, by
changing the width in the sliding direction, it is possible to adjust the supply time of
refrigerant to the formed article for each through hole 131. At each through hole
131, by changing the width in the direction perpendicular to the sliding direction, it is
possible to adjust the flow rate per unit time of the refrigerant supplied to the formed
article for each through hole 131. Therefore, the cooling time, cooling speed, and
the like can be appropriately set for each part of the formed article.
[0069]
For example, when it is desired that, in the formed article, the portion to be
formed by a side surface 11Ab of the punch part 11A is cooled more harshly than
other portions, the width of the through hole 131 corresponding to the flow channel
113 which opens at the side surface 11Ab may be made larger than the width of other
through holes 131 in the sliding direction and/or the direction perpendicular to the
sliding direction. When it is desired that, in the formed article, the portion to be
formed by a flange part 11B is cooled more weakly than the other portions, the width
of the through hole 131 corresponding to the flow channel 113 of the flange part 11B
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- 23 -
may be made smaller than the width of other through holes 131 in the sliding
direction and/or the direction perpendicular to the sliding direction.
[0070]
FIGS. 7 to 14 show, for the sake of convenience of explanation, two types of
through holes 131 having different widths in the sliding direction and/or the direction
perpendicular to the sliding direction. However, the opening/closing member 13
may also be provided with three or more types of through holes 131 having different
widths in the sliding direction and/or the direction perpendicular to the sliding
direction. By efficiently providing a plurality of types of through holes 131 in the
opening/closing member 13, it is possible to efficiently perform ejection control of
the refrigerant from the plurality of flow channels 113.
[0071]
In the example shown in FIGS. 7 to 14, the opening/closing member 13 is
moved to one side in the sliding direction so that the through holes 131 are
overlapped with the flow channels 113 into a communication state, and thereafter the
opening/closing member 13 is moved to the other side in the sliding direction to
return it to the initial position so that the through holes 131 are brought into a noncommunication
state. However, the through holes 131 may be brought into a noncommunication
state by, after moving the opening/closing member 13 to one side in
the sliding direction so that the through holes 131 are overlapped with the flow
channels 113 thereby being brought into a communication state, keeping on the
through holes 131 to move passing the flow channels 113. Next, when bringing the
through holes 131 into a communication state, the opening/closing member 13 may
be moved to the other side in the sliding direction. In other words, by moving the
opening/closing member 13 to the other side in the sliding direction, the through
holes 131 in a non-communication state are made to overlap the flow channels 113,
thus being brought into a communication state. Thereafter, by moving the
opening/closing member 13 further to the other side in the sliding direction and
returning it to the initial position, the through holes 131 pass the flow channels 113
and are brought into a non-communication state. When returning the
opening/closing member 13 to the initial position, in order to suppress the ejection of
the refrigerant from the die, supply of refrigerant may be stopped by stopping a
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- 24 -
refrigerant supply unit (refrigerant pressure feeding means), closing the valve
provided in the refrigerant supply portion of the refrigerant supply unit, or the like.
[0072]
In the first embodiment, the storage portion 122 of the die base 12 is
configured by the plurality of grooves 124, 125 provided at the surface 121. In the
storage portion 122, one or more island-like portions surrounded by the grooves 124,
125, in other words, one or more portions that protrude from the bottom surface of
the concave storage portion 122 to come into contact with the opening/closing
member 13 are formed. For that reason, for example, the storage amount of
refrigerant in the storage portion 122 can be reduced compared with the case in
which the storage portion 122 is a single concave portion without the island-like
portion. Therefore, when supply of refrigerant to the storage portion 122 is started
without the storage portion 122 being filled with refrigerant, it is possible to reduce
the time from when the supply of the refrigerant to the storage portion 122 is started
until when the refrigerant is allowed to flow into each flow channel 113 of the die
body 11. On the other hand, when the supply of the refrigerant to the storage
portion 122 is started with the storage portion 122 being already filled with the
refrigerant, good responsiveness of the refrigerant pressure (the performance that the
refrigerant in the storage portion 122 flows into each flow channel 113 in response to
the start of supply of refrigerant to the storage portion 122) can be ensured. In other
words, in the case of a storage portion 122 having an island-like portion surrounded
by the grooves 124, 125, even if the supply flow rate of refrigerant does not change,
the responsiveness of refrigerant pressure can be improved compared to the storage
portion 122 without an island-like portion. In addition to this, even when the
surface position (water level) of the refrigerant in the storage portion 122 has been
lowered before the refrigerant is supplied, the time fluctuation until the refrigerant
can flow into each flow channel 113 of the die body 11 can be suppressed.
[0073]
Further, by configuring the storage portions 122 by bringing the plurality of
grooves 124, 125 into communication with each other, it is possible to integrate
piping systems to be connected to the die base 12, and expand the diameter of the
pipe connected to the die base 12. Therefore, it is possible to suppress the pressure
25
- 25 -
loss of the refrigerant to be supplied to the storage portion 122. Furthermore, it is
possible to compensate the decrease in the flow rate of refrigerant in the
communication portion between each flow channel 113 of the die body 11 and the
storage portion 122, and stabilize the flow rate of refrigerant ejected from the
forming surface 111 through the flow channels 113. Similarly, if the discharge
portion 123 is configured by a plurality of grooves in communication with each other,
it is possible to integrate piping systems on the discharge side and expand the
diameter of the pipe connected to the die base 12, thereby allowing to suppress the
pressure loss of the refrigerant ejected from the discharge portion 123. Moreover, it
is possible to compensate decrease in the flow rate of refrigerant in the
communication portion between each flow channel 114 of the die body 11 and the
discharge portion 123, and stabilize the flow rate of refrigerant discharged from the
discharge portion 123 through the flow channels 114.
[0074]
In the first embodiment, the grooves 124, 125 of the die base 12 are provided
so as to be in communication with each other and correspond to the plurality of
through holes 131 of the opening/closing member 13. This makes it possible to
uniformize the pressure distribution of the refrigerant flowing from the grooves 124,
125 into the flow channels 113 of the die body 11 through the through holes 131.
[0075]
In the first embodiment, since the refrigerant storage portion 122 is formed in
the die base 12, it is not necessary to make a cavity in the die body 11 which is
dependent on the shape of the formed article, and also it is not necessary to prepare a
container for the refrigerant according to the shape of the cavity. Therefore, the
production of the die body 11 becomes easy. Further, providing the refrigerant
storage portion 122 in the die base 12 makes it possible to share the die base 12 with
a plurality of types of die bodies 11.
[0076]
For example, if the pitch of the flow channels 113 in the lateral direction of
the die body 11 is set to an integer multiple of the pitch of the grooves 124 of the die
base 12, no matter which die body 11 is mounted to the die base 12, each flow
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- 26 -
channel 113 faces the groove 124. Therefore, one die base 12 can be shared by a
plurality of types of die bodies 11.
[0077]
In the first embodiment, ejection control of refrigerant is performed by the
opening/closing member 13 disposed between the die body 11 and the die base 12.
Since the opening/closing member 13 is separate from the die body 11 and the die
base 12, it is possible to replace it appropriately. In other words, it is also possible
to exchange the opening/closing member 13 of the die 10 with another
opening/closing member 13 in which the through holes 131 are located differently.
Thereby, the flow channels 113 of the die body 11 can be selectively used.
[0078]
In the first embodiment, an example in which the die 10 includes one
opening/closing member 13 has been described, but the number of the
opening/closing members 13 is not particularly limited. The die 10 can also include
a plurality of opening/closing members 13 as necessary. For example, in the die 10,
a plurality of opening/closing members 13 may be placed in parallel on the surface
121 of the die base 12. These opening/closing members 13 slide, for example, in
the same direction on the surface 121 of the die base 12.
[0079]

FIG. 15 is a sectional view (cross section view) in a plane perpendicular to the
longitudinal direction of the die 10A according to a second embodiment. The die
10A according to the second embodiment differs from the die 10 according to the
first embodiment in the configuration of the opening/closing member. In FIG. 15,
only the flow channels 113 on the refrigerant supply side are shown, and the flow
channels 114 on the refrigerant discharge side are omitted.
[0080]
As shown in FIG. 15, the die 10A includes a plurality of opening/closing
members 13A and 13B. Each of the opening/closing members 13A and 13B has a
solid plate shape. The opening/closing members 13A and 13B are members
separate from the die body 11 and are disposed outside the die body 11. More
specifically, the opening/closing members 13A and 13B are disposed between the die
27
- 27 -
base 12 and the die body 11. The opening/closing member 13A is placed on the
opening/closing member 13B. The opening/closing members 13A and 13B are
provided with driving units 133A and 133B, respectively. The opening/closing
members 13A and 13B slide independently in the lateral direction of the die 10A.
The opening/closing member 13A includes a plurality of through holes 131a. The
opening/closing member 13B includes a plurality of through holes 131b. Referring
to FIGS. 16 to 19, the operation of the opening/closing members 13A and 13B will
be described.

We claim:
1. A die, comprising:
a die base in which a storage portion for storing refrigerant is formed;
a die body mounted to the die base, the die body including a mounting surface
located on the storage portion side of the die base, a forming surface located on the
opposite side of the mounting surface, and a plurality of flow channels passing
through the die body from the mounting surface toward the forming surface; and
an opening/closing member disposed between the die base and the die body,
and including a plurality of through holes corresponding to the plurality of flow
channels, wherein
the opening/closing member is configured to be movable with respect to the
die base and the die body such that each of the through holes brings a corresponding
flow channel and the storage portion into communication.
2. The die according to claim 1, wherein
the opening/closing member has a plate shape, and slides with respect to the
die base and the die body.
3. The die according to claim 2, wherein
the plurality of through holes include a first through hole and a second
through hole, and
a width of the second through hole is larger than a width of the first through
hole in a sliding direction of the opening/closing member and/or a direction
perpendicular to the sliding direction.
4. The die according to claim 2 or 3, wherein
the opening/closing member slides in two axial directions with respect to the
die base and the die body.
5. The die according to any one of claims 1 to 4, wherein
36
- 36 -
the die base has a plurality of grooves configuring the storage portion on its
surface, and
the plurality of grooves are in communication with each other.