FIELD OF THE INVENTION
The present invention relates to a roll chock clamp adapted to control axial movement of
chock in light structural rolling mill for desired precise aligning of the roll groove of the top
and bottom rolls in a stand. More importantly, the present invention is directed to providing
an improved roll chock clamp configuration capable to ensure accurate pass roll profile
between the axially displaceable top and bottom rolls with respect to roll housing while
ensuring a rigid support for the rolls free of any vibrations and related wear and unwanted
displacement of the rolls or deformation in roll pass groove geometry due to lateral/axial
shift while in operation. Advantageously, the present roll chock clamps increase the depth
area of roll clamps in mating zone of clamps and roll chock provide improved rigidity of roll
mounting in the housing by providing increased area of contact between the mating
surfaces of the chock and the clamp. Depth has been decided on the basis of average axial
shifting done in any particular roll assembly. Increase in surface area has improved the
rigidity of axial setting. Bolts have been replaced by modification in clamp design and extra
height in clamps have been provided to have flat contact area between roll chock clamp and
roll chock. The roll chock clamp device according to the present invention thus on one hand
is simple to install and easy to fix/operate and on the other hand ensure rigid support for
the rolls mounted in housing posts of roll stands such that the continuous rolling operation
can go uninterrupted without requirements of periodic resetting due to vibration,
hammering and resultant wear and slackening. Also, the possible occurrence of the
deformation of roll pass groove due to axial shift of rolls due to gaps/slack created at the
mating/contact surface of the threaded portion of bolts and the corresponding receiving
portion of the clamps as well as between the contact area of clamp and chock during
continuous operation is avoided by way of improved clamp configuration and thus reducing
material rejection. The roll chock clamp according to the present invention thus providing
simple, fast and accurate means for mounting of rolls in housing to define desired roll pass
groove geometry by aligning of the rolls by moving axially in a reliable manner while also
improving productivity reducing delay due to frequent resetting, favoring wide scale
application of such roll chock clamps in light structural rolling mills.
BACKGROUND ART
It is known in the related art of setting of rolls in horizontal rolling stands of light structural
mills that use of roll chocks are essentially used to provide adjustable yet rigid support for
Rolls in the Rolling Mills housing installed in roll assembly. Each assembly consists of roll

and roll chock. Roll assembly rests in roll housing with the help of roll chock at two ends.
Roll chocks takes the position in between the housing posts of rolling stand. Alignment of
top and bottom rolls are carried out both axially and vertically to set the rolling line
precisely. Axial movement of rolls is achieved by pushing roll chock with respect to roll
housing. Pushing is executed by the actuation of side clamps of the roll housing. Clamps are
fixed on the housing post with bolt connections from outside. It is also known and obvious
in the existing art that structural rolling require top and bottom roll pass grooves being set
accurately as well as precisely to define the groove geometry and the roll parting line. Slight
dislocation may result in production losses. Existing roll chock of Light Section Mill has
button type design. Clamps are fixed on the roll housing with bolts and another set of bolts
are attached to the clamps, which moved the roll chock. Roll assembly is moved axially by
additional bolts attached to clamps. Bolts move in thread of the clamp. In the course of
continuous rolling, bolts contact surface gets worn-out due to vibration and continuous
hammering. The consequence is more serious in less rigid stands. It creates gap and allows
roll assembly to shift axially. In structural rolling mills, axial displacement of one roll
assembly leads to deform pass groove shape from the desired geometry based on required
rolled section profile. It results cobble formation during entry of bar in pass groove. If bar
enters the pass groove, during further rolling it leads to twisting of bar. All these
occurrences are undesirable and causes loss of production and delay. Hence regular setting
and adjustment of clamp bolts are needed in the existing practice. In case of multiple bolts
setting, since all bolts require to be moved equi-distance to firmly shift roll chock, uniform
adjustment by all bolts is a complex option.
There has thus been a need in the related art to providing an improved configuration of the
roll chock clamp adapted to ensure rigid and secured mounting of the rolls in housing of
rolling stands while also providing the flexibility of the axial and vertical roll adjustments to
ensure the roll pass groove and parting line precisely. The roll chock clamp configuration
would on one hand be simple and easy and quick to install and is adapted to providing a
rigid mounting once the roll is housed in the roll chock in the respective post of roll stand.
The roll chock clamp configuration would ensure enhanced surface area of contact between
the clamp and the roll chock to ensure reliable uninterrupted operation avoiding slackening
due to wear and tear, due to vibration and hammering during continuous operation.

OBJECTS OF THE INVENTION
The basic object of the present invention is thus directed to developing a roll chock clamping
device for light structural rolling mills for improved clamping of roll chock to the rolling mill
housing adapted to ensure reliable and uninterrupted rolling operation for longer period
without resetting, producing quality rolled product with reduction in delay and material loss.
Another object of the present invention is directed to developing a roll chock clamping
device for light structural rolling mills adapted to provide accurate setting of the top and
bottom rolls adjusting in axial and vertical directions so as to ensure desired roll groove
pass and roll parting line free of any deformation due to vibration or wear and tear during
operation.
A further object of the present invention is directed to developing a roll chock clamping
device for light structural rolling mills that improves the rigidity of axial setting of roll
assembly in roll housing mating surface area of the clamp and the chock.
A still further object of the present invention is directed to developing a roll chock clamping
device for light structural rolling mills wherein mating surface area of clamp is increased and
it remain always in contact with roll chock side surface by tightening the fixing bolt of roll
clamp to roll housing and thus ensuring a secured and rigid connection free of any
unwanted roll shift during rolling operation.
A still further object of the present invention is directed to developing a roll chock clamping
device for light structural rolling mills wherein increased surface area of contact helps
reducing the wear rate of contact surface, improves axial rigidity of roll assembly, ensuring
prolonged use.
A still further object of the present invention is directed to developing a roll chock clamping
device for light structural rolling mills wherein the setting of roll chock clamp with the chock
in roll housing with increased contact surface area is having little impact of hammering and
vibration during rolling.

A still further object of the present invention is directed to developing a roll chock clamping
device for light structural rolling mills wherein provision of single bolt for fixing the roll
chock clamp on the post of roll housing to hold the roll chock in position favour easier
setting of rolling line with new roll clamp and roll assembly and does not require frequent
adjustment during rolling and thus reducing unwanted delay in rolling operation.
A still further object of the present invention is directed to developing a roll chock clamping
device light structural rolling mills wherein increased contact surface area of clamp and the
roll chock reduces cobble generation by avoiding occurrence of misalignment of pass groove
or twisting of rolled bar.
SUMMARY OF THE INVENTION
The basic aspect of the present invention is thus directed to Roll chock clamp adapted to
control axial movement of chock in light structural rolling mills comprising:
a substantially "L" shaped chock clamp with its extended arm providing for the bolt hole for
fixing clamp on housing and its shorter arm free end providing for a desired extended
mating surface between the clamp and the roll chock for improved rigidity of setting.
Another aspect of the present invention is directed to said Roll chock clamp wherein the
depth of the roll clamps in mating zone of clamp and the rill chock is selectively provided
based on the average axial shifting in any particular roll assembly.
A further aspect of the present invention is directed to the Roll chock clamp wherein extra
height in clamp is provided in contact area between roll chock clamp and roll chock.
A still further aspect of the present invention is directed to said Roll chock clamp wherein
the thickness of the mating surface area of the clamp is provided such that the mating
surface always remains in contact with roll chock side surface when bolt of roll clamp is
fixed to the roll housing and tightened.
According to yet another aspect of the present invention directed to said Roll chock clamp
wherein the said increase in mating surface area is adapted to (a) reduce wear rate of
contact surface; (b) reduce impact of hammering and vibration during rolling on roll chock

setting; (c)make it easier to set rolling line with new roll clamp and roll assembly; (d) avoid
frequent adjustment during rolling; (e) improve axial rigidity of roll assembly; (f)reduce
cobble generation due to (i) misalignment of pass groove and/or(ii) Twisting of bar.
A still further aspect of the present invention directed to said Roll chock clamp adapted such
that axial adjustment can be done by single set of bolts fixed on the rolling mills housing.
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
Figure 1: is the schematic illustration of the roll assembly in housing of rolling mill stand
showing the location of roll chock clamp and the roll chock mounted on the housing.
Figure 2: is the schematic illustration of the existing configuration of the roll chock clamp
showing the multiple setting bolts and smaller mating contact surface area between clamp
and the roll chock upon fixing of the clamp on housing.
Figure 3: is the schematic illustration of the roll chock clamp configuration according to the
present invention showing the increased contact surface area between the clamp and the
roll chock on mounting of chock with clamp on housing.
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE
ACCOMPANYING FIGURES
The present invention is directed to an improved roll chock clamping device configuration
adapted to control axial movement of chock in light structural rolling mills for improved
clamping of roll chock to the rolling mill housing adapted to ensure precise and accurate
adjustment of the roll parting line and pass groove profile as well as providing an axially
rigid roll assembly favoring reliable and uninterrupted rolling operation for longer period
without resetting, producing quality rolled product with reduction in material loss and delay.
Reference is first invited to the accompanying Figure 1, that illustrates the roll assembly
showing the location of roll chock and the roll chock clamp fixed with respect to the post of
roll housing in rolling mill stand. Rolls are installed in roll assembly in the Rolling Mills
housing. It consists of roll and roll chock. Roll assembly rests in roll housing with the help of
roll chock, at two ends. Roll chocks takes the position inside the housing post of rolling

stand. Alignment of top and bottom rolls are done axially and vertically to set the rolling
line. Axial movement of rolls is done by pushing roll chock with respect to roll housing by
means of a set of clamp bolts. Pushing is executed by the side clamps of the roll housing.
Clamps are fixed on the housing post from outside. In structural rolling, top and bottom roll
pass grooves also need accurate setting. Slight dislocation may result production loss.
Existing roll chock of Light Section Mill has button type design. As clearly apparent from
accompanying Figure 1, the Clamps are fixed on the roll housing with bolts and another set
of bolts are attached to the clamps, which move the roll chock.
Reference is next invited to the accompanying Figure 2, which schematically illustrates the
existing configuration of the roll chock clamp showing the multiple setting bolts and smaller
mating contact surface area between clamp and the roll chock upon fixing of the clamp on
housing. Roll assembly is moved axially by additional bolts attached to clamps. Bolts move
in thread of the clamp. It is experienced in the setting of roll assembly with the existing roll
chock clamp configuration that in the course of continuous rolling, bolts contact surface gets
worn-out due to vibration and continuous hammering. It is more serious in less rigid stands.
It creates gap and allows roll assembly to shift axially. In structural rolling mills, axial
displacement of one roll assembly tends to deform pass groove shape. It results cobble
formation during entry of bar in pass groove. If bar enters the pass groove, in further rolling
it leads to twisting of bar. Because of all these undesirable consequences, substantial loss of
production and delay is caused. Thus frequent setting and adjustment of clamp bolts are
needed in existing practice. More over, due to multiple bolts setting, uniform adjustment by
all bolts is difficult to achieve since all bolts required to be moved through equal distance in
synchronization, to shift the roll chock firmly with roll assembly.
Reference is now invited to the accompanying Figure 3, which schematically illustrates the
roll chock clamp configuration according to the present invention showing the increased
contact surface area between the clamp and the roll chock obtained on mounting of roll
chock with clamp on housing. In the present configuration, the clamp has been modified
such that the thickness of mating surface area of clamps has been increased. Therefore
mating surface is always in contact with roll chock side surface when fixing bolt of roll clamp
to the roll housing is tightened. Increase in surface area reduces wear rate of contact
surface making it fit for prolonged use with satisfactory performance. Also, hammering and
vibration during rolling has less impact on roll chock setting. In roll chock clamping device
according to the present invention, the bolts used for pushing the roll chock assembly has

been replaced by modification of roll chock clamps. In prior art chock clamp configuration
smaller cross sectional area of bolts was the mating surface between clamps and roll chock.
It has been modified by increasing the depth of roll clamps in mating zone of clamps and
roll chock, increasing the area of contact between the two. Depth has been decided on the
basis of average axial shifting done in a particular roll assembly. Increase in surface area
has thus improved the rigidity of axial setting. It is clearly apparent from the accompanying
Figure 3, that independent fixing bolts have been replaced by modification in clamp design
and increased height in clamps have been provided in contact area between roll chock
clamp and roll chock. Axial adjustment is done by single set of bolt fixed on the rolling mills
housing. This facilitate reduces wear rate of contact surface due to increase in surface area
even with prolonged operation. In the present configuration, the tightening of bolt gives
wedge effect to the clamp on chock surface, making the roll-chock assembly and clamp rigid
with respect to rolling mill housing. The improved axial rigidity of roll assembly thus reduces
cobble generation due to either misalignment of pass groove or twisting of bar and thereby
reducing material loss and unwanted delay in production avoiding frequent resetting or
adjustments. It has contributed to reduction in maximum operation delay by 5.4% from
13.7% to 8.3% after introduction of the improved configuration of the roll chock clamping
having increased contact surface and easier and faster setting of roll assembly eliminating
the need for frequent adjustment during rolling.
It is thus possible by way of the present invention to providing a roll chock clamp assembly
for fixing/setting of roll assembly in rolling stand housing in a axially rigid manner enabling
accurate aligning of the top and bottom roll to defining precisely the pass groove profile and
defining the roll parting line so that once setting is done there occurs no axial shift of rolls
causing production of defective rolled section for longer run of structural rolling mills.
Moreover, the improved configuration of the roll chock clamping device providing increased
contact surface area between the clamp and the roll chock when the clamp is fixed on
housing by tightening single bolt. The roll setting using the roll chock clamp of the present
invention is thus simple to install, favour quick setting of roll assembly, reduce rate of wear
and tear of mating surfaces and thus roll shift due to gap/slack generation due to vibration
and hammering during continuous rolling operation. The roll chock clamp device also
eliminate need for frequent adjustments during rolling, reduce material loss due to
misalignment of pass profile at parting line and thus reducing the delay and improving the
productivity significantly in rolling mill stands.

We Claim:
1. Roll chock clamp adapted to control axial movement of chock in light structural rolling
mill comprising:
a substantially "L" shaped chock clamp with its extended arm providing for the bolt hole for
fixing clamp on housing and its shorter arm free end providing for a desired extended
mating surface between the clamp and the roll chock for improved rigidity of setting.
2. Roll chock clamp as claimed in claim 1 wherein the depth of the roll clamps in mating
zone of clamp and the rill chock is selectively provided based on the average axial shifting in
any particular roll assembly.
3. Roll chock clamp as claimed in anyone of claims 1 to 2 wherein extra height in clamp is
provided in contact area between roll chock clamp and roll chock.
4. Roll chock clamp as claimed in anyone of claims 1 to 3 wherein the thickness of the
mating surface area of the clamp is provided such that the mating surface always remains
in contact with roll chock side surface when bolt of roll clamp is fixed to the roll housing and
tightened.
5. Roll chock clamp as claimed in anyone of claims 1 to 4 wherein the said increase in
mating surface area is adapted to (a) reduce wear rate of contact surface ;(b) reduce
impact of hammering and vibration during rolling on roll chock setting;(c )make it easier to
set rolling line with new roll clamp and roll assembly;(d) avoid frequent adjustment during
rolling; (e) improve axial rigidity of roll assembly;(f)reduce cobble generation due to
(i)misalignment of pass groove and/or(ii) Twisting of bar.
6. Roll chock clamp as claimed in anyone of claims 1 to 5 adapted such that axial
adjustment can be done by single set of bolts fixed on the rolling mills housing.
7. Roll chock clamp adapted to control axial movement of chock in light structural rolling
mill substantially as herein described and illustrated with reference to the accompanying
Figure3.

TITLE: ROLL CHOCK CLAMP ADAPTED TO CONTROL AXIAL MOVEMENT OF CHOCK IN LIGHT
STRUCTURAL ROLLING MILL.
A roll chock clamp device adapted to control axial movement of chock in light structural
rolling mill for precise aligning of the roll groove profile, while ensuring a rigid support for
the rolls free of any vibrations/wear. The roll chock clamp prevents lateral/axial shift of rolls
due to vibration/hammering while in operation. Importantly, the present roll chock clamps
increase the depth of roll clamps in mating zone of clamps and roll chock and also increase
the contact surface area to thereby enhancing the rigidity of axial setting. Depth has been
decided on the basis of average axial shifting done in any particular roll assembly. Bolts
have been replaced by modification in clamp design and extra height in clamps favour flat
contact area between roll chock clamp and roll chock. The roll chock clamp thus providing
simple, fast, durable and accurate means for mounting of rolls with accurate pass groove
geometry in a reliable manner favoring wide scale application in light structural rolling mill.