US3765213A - Rolling mills - Google Patents

Rolling mills Download PDF

Info

Publication number
US3765213A
US3765213A US00200819A US3765213DA US3765213A US 3765213 A US3765213 A US 3765213A US 00200819 A US00200819 A US 00200819A US 3765213D A US3765213D A US 3765213DA US 3765213 A US3765213 A US 3765213A
Authority
US
United States
Prior art keywords
roll
work
work rolls
rolling mill
mill stand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00200819A
Other languages
English (en)
Inventor
N Townsend
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Iron and Steel Research Association BISRA
Original Assignee
British Iron and Steel Research Association BISRA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Iron and Steel Research Association BISRA filed Critical British Iron and Steel Research Association BISRA
Application granted granted Critical
Publication of US3765213A publication Critical patent/US3765213A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
    • B21B31/04—Rolling stand frames or housings; Roll mountings ; Roll chocks with tie rods in frameless stands, e.g. prestressed tie rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/10—Driving arrangements for rolls which have only a low-power drive; Driving arrangements for rolls which receive power from the shaft of another roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/36—Spacers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
    • B21B31/30—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by wedges or their equivalent

Definitions

  • ABSTRACT [30] Foreign Application Priority Data Dec. 17, 1970 Great Britain 59,985/70
  • a rolling mill stand for rolling metal bars has two grooved work rolls. Only one of the work rolls is di- [52] US. Cl. 72/249 rectly driven from the drive motor, the other work roll [51] Int. Cl B2lb 35/00 being driven by frictional engagement with the driven [58] Field of Search 72/249, 244, 245, roll, The two work rolls are pressed together with a 37 force greater than twice the rolling load to permit the rolling torque to be transmitted from the driven work [56] References Cited roll to the other roll.
  • a rolling mill stand including two work rolls, at least one of the work rolls having one or more recesses running circumferentially around the surface of the roll characterised in that only one work roll has a coupling for connecting it to a drive motor and in that means are provided for squeezing the two work rolls together so that in use the necessary rolling torque is supplied to the second roll by frictional force between the mating surfaces of the coupled first work roll and the second work roll.
  • the work rolls may be supported by back-up rolls, or alternatively there may be no back-up rolls present.
  • the work roll ends are held in roll chocks, a tension member being provided for pressing the roll chocks towards one another thus squeezing the two work rolls together.
  • the roll chocks are generally-separated by a spacer, which may consist of one or more wedges, which is adjustable to alter the spacing between the rolls.
  • the surfaces of the spacer which bear against the roll chocks are preferably curved as seen in a cross section parallel to the plane of the roll axes, to permit the roll chocks to rock in the plane containing the roll axes as the work rolls flex.
  • the surfaces of the spacer which bear against the chocks may be coated with a substance having a low coefficient of friction.
  • the tension member can include a prestressing bolt passing through the roll chocks and secured externally of the roll chocks.
  • Resilient members may be incorporated with the tension member so that any excessive loads on the mating surfaces of the work rolls can be absorbed by the resilient members.
  • the work rolls should preferably be squeezed to gether with a force greater than twice the rolling load.
  • Routine stand changing procedure is also speeded up because only one coupling requires disconnection and reconnection, and access to the coupling is greatly improved.
  • FIG. 1 shows a general arrangement in elevation and partly in section of one embodiment of a rolling mill stand according to the invention
  • FIG. 2 shows in elevation a cross-section of another and preferred embodiment of a rolling mill stand according to the invention
  • FIG. 3 shows a cross-section on line III-III of FIG.
  • FIG. 4 shows a cross-section on line lV-IV of FIG. 3
  • FIG. 5 shows a view on line V-V of FIG. 2.
  • a rolling mill stand 1 is shown with two work rolls 2 and 3, both work rolls having recesses 4 running circumferentially around their surfaces in which the product is worked. Only the first work roll 2 is connected by a coupling 5 to a drive motor 6. The ends of the work rolls 2 and 3 are held in upper and lower rolls chocks 7 and 8 respectively which are mounted within a housing 9. A conventional screwdown mechanism is shown at 10. The work rolls 2 and 3 are squeezed together by hydraulic capsules (not shown) between the housing 9 and the lower roll chocks 8 so that in use the necessary rolling torque is supplied to the second work roll 3 by frictional force between the mating surfaces of the coupled first work roll 2 and the second work roll 3. I
  • a first and second work roll 12 and 13 respectively are mounted together as shown. Both rolls 12 and 13 have recesses 14 running circumferentially around their surfaces in which the product is worked and the rolls contact one another at mating surfaces 29. Only the first work roll 12 has a coupling 15 for connecting it to a drive motor (not shown). The ends of the work rolls I2 and 13 are held in upper roll chocks l6 and lower roll chocks 17 respectively. Cylindrical roller bearing 18 support each roll end radiallywithin each roll chock 16, 17 and the roll ends distant from the coupling 15 are also axially located by spherical thrust bearings 19.
  • Each upper and lower roll chock 16, 17 is separated from one another by a spacer in the form of a wedge system 20.
  • the wedge system 20 comprises two op-. posed wedges 30 and 31.
  • the surfaces 21, 22 of the wedge system 20 which bear against the roll chocks 16, 17 are curved as seen in a cross-section parallel to the plane of the work roll axes.
  • the surfaces 21, 22 of the wedge system 20 are coated with PTFE which is a substance having a low coefficient of friction.
  • Tension members consisting of prestressing bolts 25 passing through the roll chocks 16, 17 and secured externally of the roll chocks 16, 17 by their respective nuts 26 on the threaded portions 34 of the bolts 25 are provided for squeezing the two work rolls 12, 13 together, so that in use the necessary rolling torque is supplied to the second work roll 13 by frictional force between the mating surfaces 29 of the coupled first roll 12 and the second work roll 13.
  • the work rolls 12, 13 are squeezed together with a force greater than twice the maximum rolling load. There are no back-up rolls bearing on the work rolls 12 and 13.
  • Belville or dished washers 27 incorporated with the tension members are positioned under the lower heads 28 of the prestressing bolt 25.
  • These resilient members have highly non-linear load/deflection characteristics and reduce the danger of overloading the mating roll surfaces and bearings through some mishap, for example, abnormal roll expansion through lack of cooling water. Then, if the rolls expand abnormally, there is relatively little change in the bearing load, and the mill stiffness is unaffected.
  • the wedge system 20 is adjustable by means of tie rods 32 with threads 35 at one end and nuts 33 to change the distance between roll chocks 16 and 17 and thus the distance between the work roll centres.
  • the rolls 12, 13 are squeezed together in a hydraulically powered press or jig with a force greater than twice the maximum rolling load.
  • the wedge system 20 tie rods 32 and prestressing bolts 25 are then inserted and known prestressing tools are applied to the wedge tie rods 32, and the prestressing bolts 25.
  • Tensile forces are applied simultaneously to the tie rods 32 and prestressing bolts 25 and the forces gradually increased at a fixed ratio until the prestressing bolt load is the same as the force between the rolls.
  • the ratio of the load applied to the prestressing bolts 25 and that applied to the tie rods 32 is arranged to be equal to the mechanical advantage of the wedge system 20, which when the surfaces of the wedge system are coated with a material having a very low coefficient of friction, is approximately tan 0, where is the semi-included angle of the wedge system 20.
  • the nuts 26 and 33 on the threaded portions 34 and 35 of the prestressing bolts 25 and the tie rods 32 respectively are then locked up and the externally applied prestressing loads removed.
  • the force between the rolls and the separating force between the chocks 16, 17 are now equal and greater than twice the rolling load.
  • the work rolls used in the rolling mill stand may be slightly barrel-shaped. This would promote the even loading of the mating roll surfaces and so minimise the incidence of roll surface fatigue by compensating to some extent for roll flexure which occurs when rolling.
  • the wedge system may be two opposed wedges or in a single part.
  • Rolling mill stands according to the invention are a significant advance ove known types of stand, giving advantages in terms of cost, ease of operation and the dimensional tolerances of the products which can be rolled in them.
  • a rolling mill stand comprising two work rolls, at least one of the work rolls having one or more workpiece-engaging recesses disposed circumferentially around its surface, roll chocks for supporting each work roll at its ends, means for driving only one of the work rolls from a drive motor, and prestressing means for squeezing the surfaces of the two work rolls together into frictional engagement with each other, so that the rolling torque is transmitted from the driven work roll to the other work roll solely by friction between the mating said surfaces of the two work rolls.
  • a rolling mill stand according to claim 1 in which the prestressing means is adapted to squeeze the work rolls together with a force greater than twice the rolling load.
  • a rolling mill stand according to claim 1 in which the ends of each work roll are held in roll chocks and a tension member presses the roll chocks towards one another.
  • a rolling mill stand according to claim 1 which is two-high.
  • a rolling mill stand which comprises two work rolls, at least one of the work rolls having one or more workpiece-engaging recesses disposed circumferentially around the surface of the roll, roll chocks for supporting each work roll at its ends, a spacer separating the roll chocks from one another, means for driving only one of the work rolls from a drive motor, and prestressing means including a tension member for squeezing the surfaces of the two work rolls to commenceer into frictional engagement with each other, so that the rolling torque is transmitted from the driven work roll to the other work roll by friction between the mating said surfaces of the two work rolls.
  • a rolling mill stand according to claim 5 in which an adjusting device is provided to the spacer to permit variation in the spacing between the roll chocks.
  • a rolling mill stand according to claim 6 in which the adjusting device includes a tie rod threaded at one end and a nut movable on said thread to adjust the spacing between the roll chocks.
  • a rolling mill stand in which the surfaces of the spacer which bear against the roll chocks are curved as seen in a cross-section parallel to the plane of the roll axes, and the surfaces of the adjacent roll chocks have matching curvatures so that the roll chocks are permitted to rock in the plane containing the roll axes as the work rolls flex.
  • a rolling mill stand according to claim 5 in which resilient members are incorporated with the tension member so that any excessive loads on the mating surfaces of the work rolls can be absorbed by said resilient members.
  • a rolling mill stand comprising two work rolls, at least one of the work rolls having one or more workpiece-engaging recesses disposed circumferentially around its surface, roll chocks for supporting each work roll at its ends, means for driving only one of the work rolls from a driven motor, and a prestressing bolt passing through the roll chocks squeezing the surfaces of the two work rolls together into frictional engagement with each other, so that the rolling torque is transmitted from the driven work roll to the other work roll solely by friction between the mating said surfaces of the two work rolls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US00200819A 1970-12-17 1971-11-22 Rolling mills Expired - Lifetime US3765213A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5998570A GB1370618A (en) 1970-12-17 1970-12-17 Rolling mills

Publications (1)

Publication Number Publication Date
US3765213A true US3765213A (en) 1973-10-16

Family

ID=10484797

Family Applications (1)

Application Number Title Priority Date Filing Date
US00200819A Expired - Lifetime US3765213A (en) 1970-12-17 1971-11-22 Rolling mills

Country Status (6)

Country Link
US (1) US3765213A (it)
DE (1) DE2158885A1 (it)
FR (1) FR2118051B1 (it)
GB (1) GB1370618A (it)
IT (1) IT945815B (it)
SE (1) SE370026B (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834207A (en) * 1972-08-30 1974-09-10 Anaconda American Brass Co Method and apparatus for forming an accurately dimensioned metal strip having varying thickness
CN102114508B (zh) * 2009-12-31 2013-01-02 中国核动力研究设计院 一种制造核电站24kw稳压器变断面发热体的辊压模具及其制造工艺
CN104589881A (zh) * 2015-01-28 2015-05-06 中国重型机械研究院股份公司 一种钢板压花机压花辊辊缝在线微调装置
CN110756586A (zh) * 2019-10-10 2020-02-07 天津天泰餐具有限公司 一种西餐叉子专用原材料轧延机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US271503A (en) * 1883-01-30 William j
US929400A (en) * 1905-05-22 1909-07-27 Louis R Custer Mill for rolling shapes.
US1342343A (en) * 1919-09-05 1920-06-01 Montgomery Julian Earl Friction-drive for the top rolls of rolling-mills
US3394575A (en) * 1964-05-13 1968-07-30 United Eng Foundry Co Prestressed rolling mill

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB305445A (en) * 1928-09-01 1929-02-07 Skf Svenska Kullagerfab Ab Improvements in or relating to rolling mills
DE1427851A1 (de) * 1961-11-08 1971-07-29 Davy & United Eng Co Ltd Walzwerk

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US271503A (en) * 1883-01-30 William j
US929400A (en) * 1905-05-22 1909-07-27 Louis R Custer Mill for rolling shapes.
US1342343A (en) * 1919-09-05 1920-06-01 Montgomery Julian Earl Friction-drive for the top rolls of rolling-mills
US3394575A (en) * 1964-05-13 1968-07-30 United Eng Foundry Co Prestressed rolling mill

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834207A (en) * 1972-08-30 1974-09-10 Anaconda American Brass Co Method and apparatus for forming an accurately dimensioned metal strip having varying thickness
CN102114508B (zh) * 2009-12-31 2013-01-02 中国核动力研究设计院 一种制造核电站24kw稳压器变断面发热体的辊压模具及其制造工艺
CN104589881A (zh) * 2015-01-28 2015-05-06 中国重型机械研究院股份公司 一种钢板压花机压花辊辊缝在线微调装置
CN110756586A (zh) * 2019-10-10 2020-02-07 天津天泰餐具有限公司 一种西餐叉子专用原材料轧延机

Also Published As

Publication number Publication date
FR2118051A1 (it) 1972-07-28
DE2158885A1 (de) 1972-07-06
FR2118051B1 (it) 1976-03-26
SE370026B (it) 1974-09-30
IT945815B (it) 1973-05-10
GB1370618A (en) 1974-10-16

Similar Documents

Publication Publication Date Title
US3818743A (en) Rolling mills
US3857268A (en) Rolling mill and rolling method
US5596899A (en) Mill housings for cluster mills
US3345848A (en) Rolling mill, in particular for rods and bars
US3309909A (en) Mills for rolling metal
US3461705A (en) Apparatus for controlling the deflection of the rolls of a rolling mill
US3593556A (en) Rolling mill with prestressed housing
US2909088A (en) Mounting for backing rolls
US3373590A (en) Multi-roll stands for the cold-rolling of thin, hard strips
US3422655A (en) Prestressed rolling mill
GB1385495A (en) Rolling mills
US4197731A (en) Rolling mill capable of increased torque transmission
GB1454930A (en) Universal rolling mill
US3217525A (en) Prestressed rolling mills
US3626739A (en) Apparatus for roll counter-deflection in rolling stands
US4162627A (en) Rolling mill
US3486360A (en) Adjustment unit
US3394575A (en) Prestressed rolling mill
EP0626218B1 (en) Improved sizing stand for rolling hot-rolled bars
GB1370618A (en) Rolling mills
US4660400A (en) Pilger mill stand
US3501936A (en) Rolling mills
US3555862A (en) Apparatus for continuously rolling steel
RU2060065C1 (ru) Рабочая клеть прокатного стана
US3824830A (en) Two-high rolling stand