CN102553932A - Two-roll tandem pipe mill and roll framework locking device thereof - Google Patents

Two-roll tandem pipe mill and roll framework locking device thereof Download PDF

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Publication number
CN102553932A
CN102553932A CN2011104597022A CN201110459702A CN102553932A CN 102553932 A CN102553932 A CN 102553932A CN 2011104597022 A CN2011104597022 A CN 2011104597022A CN 201110459702 A CN201110459702 A CN 201110459702A CN 102553932 A CN102553932 A CN 102553932A
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China
Prior art keywords
roll
locking device
roll stand
locking
leading screw
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Granted
Application number
CN2011104597022A
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Chinese (zh)
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CN102553932B (en
Inventor
熊令芳
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Taiyuan Heavy Industry Co Ltd
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Taiyuan Heavy Industry Co Ltd
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Priority to CN201110459702.2A priority Critical patent/CN102553932B/en
Publication of CN102553932A publication Critical patent/CN102553932A/en
Application granted granted Critical
Publication of CN102553932B publication Critical patent/CN102553932B/en
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Abstract

The invention discloses a two-roll tandem pipe mill and a roll framework locking device thereof. The roll framework locking device comprises a pressing device and a side locking device. Rolls of the roll framework include a first roll and a second roll parallel to each other. After the roll framework is mounted into a main base, the side locking device is used for longitudinally locking the rolls of the roll framework, and the pressing device is used for pressing from the first roll to the second roll of the roll framework. The side locking device comprises a locking cylinder and a pressure-bearing backing plate, wherein the locking cylinder is arranged at the back end of the main base, and an extending end of the locking cylinder is a locking press head, a first bevel is formed on the locking press head, and a second bevel matched with the first bevel to lock the rolls longitudinally is formed on the pressure-bearing backing plate arranged at the back end of the roll framework. By the roll framework locking device, the problem of keeping horizontal rolling balance of the roll framework of the two-roll tandem pipe mill in the prior art is solved, stability of the roll framework in rolling is guaranteed effectively, and steel pipe rolling quality is improved further.

Description

Two roller tandem rolling tube machines and roll stand locking device thereof
Technical field
The present invention relates to two roller tandem rolling tube machines, relate in particular to a kind of two roller tandem rolling tube machines that are used for the roll stand locking device of two roller tandem rolling tube machines and have this roll stand locking device.
Background technology
Along with the develop rapidly of continuous rolling technology, tandem rolling tube machine substitutes traditional diagonal rolling pipe mill comprehensively becomes steel pipe rolling Equipment of Development direction.
Existing tandem rolling tube machine comprises two roller tandem rolling tube machines and three-roller tandem rolling tube machine etc.; Because the transmission mechanism of the three-dimensional transmission of three-roller tandem rolling tube machine is huge, complex structure, the roll stand manufacture difficulty is big; So the production cycle is long; The Installation and Debugging holding time is long, and production cost is high when causing utilizing the three-roller tandem rolling tube machine rolled steel tube, and the installation investment is big.
And two roller tandem rolling tube facility have drive mechanism simple, and production technology property is good, and the manufacturing cycle is short, and the installation investment is little, the advantage that cost is low.Therefore very big market potential is arranged, the employing that the domestic steel pipe's production producer that considerable part also arranged is successful two roller tandem rolling tube units, and obtained effect.
For tandem rolling tube machine, all exist the rolling equilibrium problem of horizontal direction and vertical direction.Yet; Two traditional roller tandem rolling tube machines only adopt single vertically depressing to solve rolling equilibrium problem; Though guaranteed roll stand rolling balance in vertical direction; But the roll stand of two roller tandem rolling tube machines is different with the roll stand of three-roller tandem rolling tube machine, and two roller tandem rolling tube machines are open frames, and single vertically depressing can not guarantee roll stand rolling balance in the horizontal direction.
Therefore, how to overcome the roll stand rolling equilibrium problem in the horizontal direction of two roller tandem rolling tube machines, the stability of roll stand when rolling improves the steel pipe rolling quality with effective assurance, becomes an important problem.
Summary of the invention
To the problem that exists in the prior art; The object of the present invention is to provide a kind of roll stand locking device that is used for two roller tandem rolling tube machines, to overcome the single technical problem that can not guarantee roll stand rolling balance in the horizontal direction of vertically depressing of prior art two roller tandem rolling tube machines.
Another object of the present invention is to provide a kind of two roller tandem rolling tube machines with roll stand locking device of the present invention.
The present invention realizes through following technical scheme:
A kind of roll stand locking device; Be used for two roller tandem rolling tube machines; It is characterized in that; Said roll stand locking device comprises that hold down gag and side chain tightly install, and the roll in the said roll stand comprises first roll and second roll that laterally arranges with said first roll, and said roll stand is packed into behind the main engine bed of said two roller tandem rolling tube machines; The tight device of said side chain is used for said roll stand locks at said roll longitudinally, and said first roll that said hold down gag is used for said roll stand is compressing on the said second roll direction extremely; The tight device of said side chain comprises: be arranged at the locking cylinder of said main engine bed rear end, the external part of said locking cylinder is formed with first inclined-plane for the locking pressure head on said locking pressure head; Be arranged at the pressure-bearing backing plate of said roll stand rear end, be formed with on the said pressure-bearing backing plate with said first inclined-plane and match vertically to lock second inclined-plane of said roll at said roll.
Two roller tandem rolling tube machines of the present invention have roll stand locking device of the present invention.
Beneficial effect of the present invention is, with prior art relatively, roll stand locking device of the present invention, have simple in structure, advantage such as the advantage that volume is little can be looked frame outer space flexible arrangement, and installation and maintenance are convenient.Adopt and vertically depress (or level compresses relatively) and the tight bidirectional locking of the vertical side chain of roll; Through 90 degree arranged crosswise; Overcome two roller tandem rolling frames rolling equilibrium problem in the horizontal direction, effectively guaranteed the stability of roll stand when rolling, and then improved the steel pipe rolling quality.
Description of drawings
Fig. 1 is the sketch map of the roll stand locking device of the embodiment of the invention;
Fig. 2 is the A-A cutaway view among Fig. 1;
Fig. 3 is the B portion enlarged drawing among Fig. 2;
Fig. 4 is that C among Fig. 1 is to view.
The specific embodiment
The exemplary embodiments that embodies characteristic of the present invention and advantage will be described in detail in following explanation.Be understood that the present invention can have various variations on various embodiment, its neither departing from the scope of the present invention, and explanation wherein and accompanying drawing be the usefulness of being used as explanation in itself, but not in order to restriction the present invention.
The roll stand locking device of the embodiment of the invention is used for two roller tandem rolling tube machines.Two roller tandem rolling tube machines of the embodiment of the invention, the roll stand locking device with embodiment of the invention.
Below specifically introduce the roll stand locking device of the embodiment of the invention.
The operation principle of the roll stand locking device of the embodiment of the invention is to adopt the hold down gag vertically depressed and the side chain of horizontal direction tightly to install bidirectional locking; Spend arranged crosswise through vertically depressing with 90 of horizontal side locking; Solved the rolling equilibrium problem of two roller tandem rolling tube machines in frame horizontal direction and vertical direction; Effectively guarantee the stability of roll stand when rolling, and then improved the steel pipe rolling quality.
Like Fig. 1 and shown in Figure 4; Two roller tandem rolling tube machines of the embodiment of the invention, its frame is a plurality of, the main engine bed of each frame can comprise upper body 20, middle part body 21 and bottom body 22; Wherein, Upper body 20 is used to be provided with hold down gag, and middle part body 21 is used to install roll stand 1, and bottom body 22 then is used for main engine bed is fixed in Equipment Foundations ground.
The roll stand 1 of two roller tandem rolling tube machines of the embodiment of the invention, the topping roll 18 that is included in and under bottom roll 19, be connected with four compensating cylinders 12 between topping roll 18 and the bottom roll 19.In this specification, be front side (end) with the side that is connected with shaft coupling of top and bottom rolls 18,19, otherwise a side is rear side (end).After topping roll 18, bottom roll 19 and compensating cylinder 12 etc. are connected formation roll stand 1; Roll stand 1 is pushed the middle part body 21 of main engine bed, and middle part body 21 has the two side, and the top has perforate; Roll stand 1 is fixed between the two side; Therefore, for the locking of roll stand 1, the locking of only remaining vertical direction and horizontal direction.
Like Fig. 1-shown in Figure 4, the side chain of the roll stand locking device of the embodiment of the invention tightly installs, and mainly comprises locking cylinder 4, locking pressure head 3 and pressure-bearing backing plate 2.As shown in Figure 2, the middle part body 21 of main engine bed can have seam, makes roll stand 1 behind the middle part body 21 of packing into, can not travel forward again; And in the rear end of roll stand 1; Be provided with pressure-bearing backing plate 2, pressure-bearing backing plate 2 to two relatively the outside stretch out, the width of pressure-bearing backing plate 2 on roll stand 1 horizontal (the paper direction among Fig. 1) is slightly larger than the width of roll stand 1 self; Outside portion in pressure-bearing backing plate 2 bottoms; Be fixedly connected with auxiliary cushion block 25, the rear end face of auxiliary cushion block 25 is processed to form to having the inclined-plane of constant slope, for example the inclined-plane of 10 degree.
Simultaneously; The rear end of body 21 at the middle part; Be provided with and match with pressure-bearing backing plate 2 to realize the tight locking cylinder 4 of roll stand 1 side chain, the external part of locking cylinder 4 is locking pressure head 3, the side near auxiliary cushion block 25 of locking pressure head 3 also cut into the identical inclined-plane of auxiliary cushion block 25 gradients.After roll stand 1 is packed middle part body 21 into, cooperate the formation locking face with inclined-plane between the auxiliary cushion block 25 through locking pressure head 3, make the thrust of locking cylinder 4 on locking face, produce horizontal component breaker roll frame 1 and lock.
In addition, auxiliary cushion block 25 can be set also, and the inclined-plane in the cooperation of above-mentioned inclined-plane is formed directly into the rear end face of pressure-bearing backing plate 2.And the surface smoothness on the inclined-plane on the pressure-bearing backing plate 2 does not need too high, coarse relatively surface more to help improving coefficient of friction, and locking effect can be better.
Known that by above the side chain of roll stand locking device of the present invention tightly installs, and is simple in structure, volume is little, can look rolling-mill housing outer space flexible arrangement, and installation and maintenance are convenient.
Introduce the hold down gag of the roll stand locking device of the embodiment of the invention again; As shown in Figure 1; Topping roll 18 is positioned at the top of bottom roll 19, so hold down gag also can be described as vertical screwdown gear, and hold down gag comprises motor 5, reductor 15,16, screw mandrel 8, nut 9 and pressure head 11 etc.
As shown in Figure 1, motor 5 itself is the reducing motor of integrated deceleration preferably, and motor 5 provides power for whole hold down gag.Motor 5 links to each other with reductor 15 through shaft coupling 6; Reductor 15 links to each other with reductor 16 through synchronous connecting axle 7; Each reductor 15,16 connects a leading screw 8 respectively, is respectively applied for from the pressure-bearing surface of the roll bearing 17 of the front-end and back-end of roll 18 to compress or unclamp roll 18.
Through the further deceleration of reductor 15,16, and convert horizontal transmission into vertical transmission, drive leading screw 8 and rotate.Be connected with nut 9 on the leading screw 8, leading screw 8 and the engagement of nut 9 internal threads make leading screw 8 realize upper and lower displacement stably, with locking with unclamp roll 18.In depressing the process of locking, because roll stand 1 is provided with compensating cylinder 12, can eliminate leading screw 8 and the thread pitch that nut 9 meshes, make transmission more steady, drafts can accurately be controlled,
Leading screw 8 is arranged in the upper body 20 of main engine bed with nut 9; The bottom of leading screw 8 has spherical transition 10, and spherical transition 10 is shapes of hemisphere jut; Be provided with pressure head 11 between roll bearing 17 upper surfaces of spherical transition 10 and roll 18; The upper surface of pressure head 11 has the spherical concave surface that the hemisphere jut with spherical transition 10 is complementary, and when leading screw 8 is depressed, drives pressure heads 11 through spherical transition 10 and produces the power of depressing; In depressing process, pressure head 11 contacts with the pressure-bearing surface of the roll bearing 17 of roll 18 under the effect of compensating cylinder 12 all the time.
Compensating cylinder 12 has 4; The position of balance bar is set, as shown in Figure 1, be the position that is positioned at longitudinal middle part at roll bearing 17 on vertically; Roll bearing 17 transversely be position near transverse ends, the direction of motion of the external part of compensating cylinder 12 and leading screw 8 to depress direction parallel.Compensating cylinder 12 is fixedly connected between the roll bearing 27 of roll bearing 17 and bottom roll 19 of roll 18, and upwards jack-up roll bearing 17 is keep-uped pressure by compensating cylinder 12, again this effect down, leading screw 8 is eliminated with the thread pitch of hold-down nut 9 engagements.Make stable drive, can control drafts accurately.
For each frame of two roller tandem rolling tube machines, under the prerequisite that the rolling groove of roll is confirmed, can be through calculating the drafts that obtains topping roll 18; Because the height of bottom roll 19 is fixed; The elemental height on compensating cylinder 12 tops is confirmed between the top and bottom rolls 19, and the length of leading screw 8 all confirms with initial position, under the definite situation of the height of the diameter of the height (distance between end face and the bottom surface) of roll bearing 17, topping roll 18, pressure head 11; Can confirm the topping roll 18 required theoretical drafts of depressing; After calculating theoretical drafts, can be scaled the number of turns of vertical leading screw 8 rotations, further be scaled the number of turns of the rotating shaft rotation of reductor 15,16; Because reductor 15,16 is synchronous, the number of turns of therefore rotating through the rotating shaft of counting reductor 16 can accurately be controlled the volume under pressure of two leading screws 8.
Above-mentioned conversion gained number of turns input is connected in the terminal encoder of reductor 16 rotating shafts; Encoder for example is a displacement encoder; The number of turns of the rotating shaft rotation of displacement encoder statistics reductor 16; When the rotating shaft rotation of adding up reductor 16 has reached the number of turns of setting, send signal to the bus programmable controller of two roller tandem rolling tube machines or the bus programmable controller of encoder place frame, to control motor 5 stalls and brake sticking brake through the bus programmable controller of two roller tandem rolling tube machines or the bus programmable controller of encoder place frame; Stop to depress of leading screw 8, make that the drafts of leading screw 8 is precisely controlled.
Simultaneously; Can on leading screw 8 or nut 9, foil gauge 13 be set; In order to detect the suffered pressure of leading screw 8; Preferably foil gauge 13 is arranged on the outer surface of nut 9, so that foil gauge 13 connects the wiring of lead, the pressure sensor of foil gauge 13 reacts the pressure that nut 9 is born through detecting deformation; When the counting of encoder does not reach when setting the number of turns and reached required locking pressure; Foil gauge 13 sends 0 or 1 logical signal to the bus programmable controller of two roller tandem rolling tube machines or the bus programmable controller of this encoder place frame, with through the bus programmable controller of two roller tandem rolling tube machines or bus programmable controller control motor 5 stalls of this encoder place frame, stops to depress of leading screw 8.
The comprehensive above-mentioned foil gauge 13 and the setting of displacement encoder can be known; Promptly will reach at the counting of displacement encoder but also do not reach when setting the number of turns; If the pressure experienced of foil gauge 13 during less than predefined locking force value, treats that leading screw 8 continues to being issued to needed drafts, this moment, displacement encoder forwarded the setting number of turns to; Send logical signal with control motor 5 stalls and brake sticking brake, can make hold down gag be in stable locking state.
And promptly will reach at the counting of displacement encoder but also do not reach when setting the number of turns; If the pressure that foil gauge 13 is experienced is greater than predefined locking force value; Foil gauge 13 transmits logical signal with control motor 5 stalls and brake sticking brake, makes hold down gag be in stable locking state.
Therefore; Setting through foil gauge 13 and displacement encoder; Can in the compaction process of hold down gag, protect the safety of production equipment itself, prevent to produce under the excessive pressure, cause motor 5, leading screw 8, nut 9 and damage that the roll stand that is locked 1 itself produces because of overload or destroy.
The process of following brief account roll change once when the needs roll change, drives leading screw 8 through motor 5 and moves upward, and to unclamp topping roll 18, removes the locking of the vertical direction of roll stand 1; The withdrawal of locking pressure head 3, the dotted line among Fig. 3, i.e. position after 3 withdrawals of expression locking pressure head is removed roll stand 1 and is locked longitudinally at roll, can roll stand 1 be pulled out and carry out roll change.After roll change finishes, roll stand 1 is pushed the middle part body 21 of main engine bed, locking pressure head 3 stretches out and cooperates with auxiliary cushion block 25 formation inclined-planes, and realization roll stand 1 is locked at roll longitudinally; Drive leading screw 8 through motor 5 and move downward,, realize the locking of the vertical direction of roll stand 1 to compress topping roll 18.
Roll stand locking device of the present invention; Also be applicable to the vertically arranged occasion of roll; Be provided with compensating cylinder between the two vertically disposed rolls; And the hold down gag in a cover the above embodiment of the present invention is respectively arranged in the two relative outsides of two rolls, and just it is vertically depressed and has become compressing each other of horizontal direction.
Advantages such as to sum up, the present invention has simple in structure, and the advantage that volume is little can be looked frame outer space flexible arrangement, and installation and maintenance are convenient.Adopt and vertically depress (or level compresses relatively) and the tight two-way locking of depressing of the vertical side chain of roll; Through 90 degree arranged crosswise; Overcome two roller tandem rolling frames rolling equilibrium problem in the horizontal direction, effectively guaranteed the stability of roll stand when rolling, and then improved the steel pipe rolling quality.
Technical scheme of the present invention is disclosed as above by preferred embodiment.Those skilled in the art should recognize change and the retouching of under the situation that does not break away from appended scope of the present invention that claim disclosed of the present invention and spirit, being done, and all belong within the protection domain of claim of the present invention.

Claims (10)

1. roll stand locking device; Be used for two roller tandem rolling tube machines; It is characterized in that; Said roll stand locking device comprises that hold down gag and side chain tightly install, and the roll in the said roll stand comprises first roll and second roll that laterally arranges with said first roll, and said roll stand is packed into behind the main engine bed of said two roller tandem rolling tube machines; The tight device of said side chain is used for said roll stand locks at said roll longitudinally, and said first roll that said hold down gag is used for said roll stand is compressing on the said second roll direction extremely;
The tight device of said side chain comprises:
Be arranged at the locking cylinder of said main engine bed rear end, the external part of said locking cylinder is formed with first inclined-plane for the locking pressure head on said locking pressure head;
Be arranged at the pressure-bearing backing plate of said roll stand rear end, be formed with on the said pressure-bearing backing plate with said first inclined-plane and match vertically to lock second inclined-plane of said roll at said roll.
2. roll stand locking device as claimed in claim 1; It is characterized in that; Said hold down gag comprises motor, reductor, leading screw and nut; Said leading screw is perpendicular to said roll setting, and said leading screw is provided with the pressure head that contacts with the pressure-bearing surface of said first roll near between an end of said first roll and said first roll, and said motor drives said leading screw through said reductor; The engagement of said leading screw and said nut drives said leading screw upper and lower displacement with locking or unclamp said first roll.
3. roll stand locking device as claimed in claim 2 is characterized in that the rearward end of said pressure-bearing backing plate is provided with auxiliary cushion block, and said second inclined-plane is formed on the said auxiliary cushion block.
4. roll stand locking device as claimed in claim 3 is characterized in that, the gradient on said first inclined-plane and said second inclined-plane is 10 degree.
5. roll stand locking device as claimed in claim 2 is characterized in that, the surface that said pressure head contacts with said screw mandrel is spherical concave surface, and the surface that said leading screw contacts with said pressure head is spherical convex surface.
6. roll stand locking device as claimed in claim 2 is characterized in that, said reductor end is connected with the displacement encoder that is used for accurately controlling said leading screw displacement, through counting the number of turns that said reductor rotating shaft is rotated, controls the drafts of said leading screw.
7. roll stand locking device as claimed in claim 6; It is characterized in that; The outer surface of said nut is provided with the foil gauge that is used for sensing pressure that said nut bears; Do not reach when setting pressure that the number of turns and said foil gauge experience greater than setting value at the counting of said displacement encoder, said foil gauge transmits bus programmable controller that logical signal gives said two roller pipe mills to control said motor stall and brake sticking brake.
8. a roller tandem rolling tube machine is characterized in that, the said two roller tandem rolling tube facility arbitrary described roll stand locking device of requirement 1-7 of having the right.
9. two roller tandem rolling tube machines as claimed in claim 8; It is characterized in that; Said first roll and the said second roll horizontal arrangement; Said first roll arrangement is provided with compensating cylinder in the top of said second roll between said first roll and said second roll, and the top of said first roll is provided with said hold down gag.
10. two roller tandem rolling tube machines as claimed in claim 8; It is characterized in that; Said first roll and vertical layout of said second roll; Be provided with compensating cylinder between said first roll and said second roll, the two relative outsides of said first roll and said second roll are provided with said hold down gag.
CN201110459702.2A 2011-12-31 2011-12-31 Two-roll tandem pipe mill and roll framework locking device thereof Active CN102553932B (en)

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CN102553932B CN102553932B (en) 2015-03-18

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104056860A (en) * 2014-06-10 2014-09-24 中国重型机械研究院股份公司 Hydraulic quick locking method for roller box
CN105583229A (en) * 2015-12-19 2016-05-18 太原重工股份有限公司 Two-roll motion-limited continuous pipe rolling mill
CN110961959A (en) * 2019-12-18 2020-04-07 太原恒信科达重工成套设备有限公司 Split type sizing mill square frame closing device
CN112275802A (en) * 2020-10-10 2021-01-29 广东恒华重工有限公司 Novel connecting shaft bracket for short stress rolling mill

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Publication number Priority date Publication date Assignee Title
CN2055415U (en) * 1989-06-22 1990-04-04 太原重型机器厂 Two-high disc rolled pipe mill
CN101428295A (en) * 2008-12-01 2009-05-13 燕山大学 Micro-scale static four-high mill
CN101708502A (en) * 2009-12-07 2010-05-19 中国重型机械研究院有限公司 Method and device for designing screw-down structure of closed frame of double-roller cold pilger mill and device thereof
CN101712048A (en) * 2009-12-17 2010-05-26 天津津重重工机器设备制造有限公司 Rolling mill base with locking wedge block
CN101927262A (en) * 2009-12-17 2010-12-29 天津津重重工机器设备制造有限公司 Rack locking oil cylinder of bar mill
CN201702165U (en) * 2010-03-23 2011-01-12 潍坊潍尔达钢管有限公司 Seamless steel tube three-roller slant rolling sizing device
CN102581010A (en) * 2012-02-14 2012-07-18 北京京诚之星科技开发有限公司 Two-roll horizontal mill

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Publication number Priority date Publication date Assignee Title
CN2055415U (en) * 1989-06-22 1990-04-04 太原重型机器厂 Two-high disc rolled pipe mill
CN101428295A (en) * 2008-12-01 2009-05-13 燕山大学 Micro-scale static four-high mill
CN101708502A (en) * 2009-12-07 2010-05-19 中国重型机械研究院有限公司 Method and device for designing screw-down structure of closed frame of double-roller cold pilger mill and device thereof
CN101712048A (en) * 2009-12-17 2010-05-26 天津津重重工机器设备制造有限公司 Rolling mill base with locking wedge block
CN101927262A (en) * 2009-12-17 2010-12-29 天津津重重工机器设备制造有限公司 Rack locking oil cylinder of bar mill
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104056860A (en) * 2014-06-10 2014-09-24 中国重型机械研究院股份公司 Hydraulic quick locking method for roller box
CN104056860B (en) * 2014-06-10 2016-01-20 中国重型机械研究院股份公司 Roll-box hydraulic pressure quick locking method
CN105583229A (en) * 2015-12-19 2016-05-18 太原重工股份有限公司 Two-roll motion-limited continuous pipe rolling mill
CN105583229B (en) * 2015-12-19 2017-11-21 太原重工股份有限公司 Two roller restraint tandem rolling pipe machines
CN110961959A (en) * 2019-12-18 2020-04-07 太原恒信科达重工成套设备有限公司 Split type sizing mill square frame closing device
CN110961959B (en) * 2019-12-18 2022-01-07 太原恒信科达重工成套设备有限公司 Split type sizing mill square frame closing device
CN112275802A (en) * 2020-10-10 2021-01-29 广东恒华重工有限公司 Novel connecting shaft bracket for short stress rolling mill
CN112275802B (en) * 2020-10-10 2022-08-12 广东恒华重工有限公司 Novel connecting shaft bracket for short stress rolling mill

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