US3491571A - Rolling mill method and apparatus - Google Patents

Rolling mill method and apparatus Download PDF

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Publication number
US3491571A
US3491571A US611692A US3491571DA US3491571A US 3491571 A US3491571 A US 3491571A US 611692 A US611692 A US 611692A US 3491571D A US3491571D A US 3491571DA US 3491571 A US3491571 A US 3491571A
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United States
Prior art keywords
force
rolls
roll
mill
rolling
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Expired - Lifetime
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US611692A
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English (en)
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Jeremiah Wagner O'brien
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United Engineering and Foundry Co
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United Engineering and Foundry Co
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Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP.OF OH
Anticipated expiration legal-status Critical
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP. OH.
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    • 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
    • B21B31/028—Prestressing of rolls or roll mountings in stand frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/005—Cantilevered roll stands
    • 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

  • mills are usually hydraulically balanced to take up most of the mechanical clearances, although not the clearance of the bearings.
  • the housings and roll diameters are relatively large in order to reduce deflections and with respect to the rolls, wear is controlled by moving to a new groove in order to keep the resulting cross section Within commercial tolerances.
  • This design recognizes the problem of rigidity and in this respect is an advancement over earlier known commercial designs, Its improvement is mainly in providing a larger mill modulus because of the increased stiffness of the roll supporting shafts. Its third bearing which is hydraulically loaded adds little to rigidity except for the taking up of mechanical clearances because the rolling load adds to the initial hydraulic loading and, consequently, does not add to mill stilfness.
  • the present invention employs a new and novel construction which results in a very rigid mill resulting in a substantially constant roll gap.
  • the present invention provides a method of rolling elongated material in which the material is fed between two roll assemblies which are rotatably carried in an overhung fashion by a support, subjecting the roll assemblies to a preloading force at a location offset from the separating force created due to rolling, and in a manner that the separating force will cause a lessening of the preloading force, controlling the preloading force to be at least greater than the separating force, and wherein the value of the preloading force is automatically decreased by at least a portion of the separating force.
  • Another object of the present invention is to provide in a rolling mill for rolling elongated material comprising two roll assemblies which are rotatably carried in an .overhung fashion by a support, means for subjecting the roll assemblies to a preloading force greater than the separating force acting on the roll assemblies due to rolling and relieving the separating force, said preloading means located axially of the separating force, the construction and arrangement being such that the separating force will cause a lessening of the preloading force which will be automatically decreased by an amount substantially equal to any increase in the separating force so as to maintain the sum of the two forces substantially constant.
  • FIGURE 1 is a sectional view of a rod or bar mill incorporating the features of the present invention
  • FIGURE 2 is an elevational view of the mill shown in FIGURE 1;
  • FIGURE 3 is a sectional view taken on lines IIIIII of FIGURE 1;
  • FIGURE 4 is a prospective exploded view of certain elements shown in FIGURES 1, 2, and 3;
  • FIGURE 5 is an elevational view of a second embodiment of the present invention.
  • FIGURE 6 is an elevational view of a still further embodiment of the invention.
  • FIGURE 7 is a partial sectional view of a further embodiment of the present invention.
  • FIGURE 8 is a sectional view taken on lines VIIIVIII of FIGURE 7.
  • a housing 10 comprising essentially a solid structure having in its upper portion a bore 11 and below the bore a rectangular shaped window 12.
  • a shaft 13 having at its far end a roller bearing 14 and on the opposite end a sleeve bearing 15.
  • a workpiece reducing'roll 16 in which is formed a single groove 17.
  • a chock 18 for receiving a shaft 19, the chock, it will be noted, extending substantially through the entire housing 10.
  • the chock principally takes the form in elevation of a block having on its opposed vertical sides identical tapering portions 20.
  • the choc; 18 supports the shaft 19 by a bearing arrangement similar to that providing for the shaft 13 which also has an overhung shaft portion to which there is secured a workpiece reducing roll 21 and which has formed thereon a groove 22, the grooves 17 and 22 cooperating together to form the roll pass for the rod or bar to be produced.
  • the chock 18 is adapted to be adjusted both horizontally and vertically relative to the housing 10 so that the roll gap can be changed and the proper alignment of the grooves 17 and 22 assured. This is accomplished by providing for the chock 18 an extension 23 which receives a nut 24, the nut being threadably engaged by a horizontally disposed shaft 25, the one end .of which extcnds through the housing 10 at the front of the mill.
  • the end of the shaft 25 is provided with a head so that upon rotation thereof the nut 24 is advanced, hence, advancing the chock horizontally along the engaging tapered surfaces of a pair of wedge elements 28 which are received in the bottom of the housing 10.
  • These members engage through tapered surfaces 38 the chock in the same plane but opposite the wedge elements 28 and are provided with opposite directional screws 39 which allow the members to move in opposite axial directions over tapered surfaces 40 formed at the top of the chock 18.
  • the upper surfaces of the elements 28 have non-tapered surfaces which engage similar surfaces formed in the housing 10.
  • FIGURES 1 and 2 the mechanism for applying a preloading to the mill in order to carry out the aforesaid objects of the present invention
  • FIGURES 1 and 2 the shafts extend away from the housing 10.
  • roller bearings 45 and 46 which rotate relative to the outer portions of the shafts and which are received in bearing support arms 47 and 4. 8 shown best in FIG- URE 2, the arms have flat opposed surfaces between which there is provided a clearance and are adapted to pivot about the shafts 13 and 19.
  • the preloading of the mill is accomplished by providing in the top arm 47 at the right side viewing FIG- URE 2, a screw 49 having its lower threaded end received in a nut 51 held by the arm 47.
  • the screw is adapted to pass through the clearance between the arms and engage the lower arm 48 for which purpose there is provided a wearplate 52.
  • the load cell has a plunger 54 at its lower side which extends into the gap between the arms and engages a wearplate 55 received in the lower arm opposite the plunger 54.
  • the load cell 53 will measure directly the force of the screw.
  • the preload L would be set so that L just declines to zero when the piece enters the mill rolls therefore in equating the above formulae and since from the fixed geometry of the system the relationship between M and M should be constant we can express this relationship as Practically, in order to insure sufificient preload, L would be set somewhat larger than required so that the initial load on the outboard bearings could be expressed as L+AL and in this case AL would be the remaining outboard load after the piece enters the rolls. Consequently, before entry L AL T F -F and after entry P AL vn m and since from above li MD M1 the gap remains constant. The value of AL can be finally adjusted after the piece enters if the preload has been misjudged.
  • the preload device is located between the two bearings of the rolls. More specifically, there is provided a roll housing 76 for receiving, as in the case of the previous arrangements, shafts 77 and 78, the shafts having overhung portions outward of the housing 76 to which there is secured in overhung fashion rolls 79 and 81 having grooves 82 and 83 which cooperate together to roll a rod or bar fed between.
  • the shafts are rotatably received in the housing 76 by sleeve bearings 84 toward the front of the mill and roller bearings 85 at the rear of the mill.
  • a bearing cartridge 86 into which the rolls extend and which is located in the vicinity of bearings 87 mounted on the shafts 77 and 78.
  • the bearing cartridge 86 at its top is provided with an opening 88 which at its lower end is enlarged for the reception of a stationary nut 89 and a washer type load cell 91.
  • a bolt 92 passes through the cartridge and engages at its lower end the bearing 87 received on the shaft 77.
  • a similar bearing 87 is received by the lower shaft 78 which is also carried by the cartridge 86. This arrangement is such that on applying a force through rotation of the bolt 92 the end of the bolt engaging the bearing 87 causes a deflection of the shaft 77 in the same direction as the separating force.
  • the reaction force of the bolt 92 is taken into the nut 89 and into the load cell 91 hence, into the cartridge 86- itself to tend to move the cartridge relative to the bolt 92. This movement, of course, will apply a similar force on the lower roll 78 causing this roll to be deflected in a direction of the separating force.
  • FIG- URES 7 and 8 this embodiment differs from the form shown in FIGURES 1, 2, and 3 in that in place of the wedge locking members 36 and 37, piston cylinder assemblies are employed.
  • the employment of the piston cylinder assembly presents the additional advantage of allowing the lower roll to be adjusted while the mill is still being operated.
  • FIGURES 7 and 8 show a housing 93 for receiving rolls 94 and 95, the bearing chock assembly 96 of the lower roll 95 receiving two pairs of piston cylinder assemblies 97 and 98.
  • the pistons it will be noted, engage the housing 93 and forcibly urge the bearing chock assembly against the pair of wedge elements 99.
  • the mill in operating the mill by malntalning the sum of the preloading force and the separating force substantially constant, the mill is extremely rigid or, what is referred to in the trade as a very hard mill. It is desirable, however, in certain mill operations to employ a relatively flexible or soft mill. In this event a mill incorporating the features of the present invention can be advantageously employed, wherein the structural components and relationship of parts associated with the prestress means, such as the arms and the lever effect will be made to possess a predetermined limberness. While such a construction will lessen the accuracy of the rolled product, the benefit of the prestress mill construction can still be realized.
  • said force applying means carried by one of said shafts and constructed and arranged to exert a force on each shaft greater than the reduction force
  • said means being characterized by the fact that on the experience of the reduction force said shafts are displaceable away from the force applying means such that the prestress force is lessened by at least a portion of the reduction force.
  • a rolling mill having a housing, a pair of shafts supported by said housing, an opening in said housing for receiving a bearing chock assembly for one of said shafts,
  • first arm carried by one of said shafts of the rolls at a point axially displaced from said rolls
  • second arm carried by the other shaft of the rolls at a point axially displaced from said rolls
  • force exerting means carried by one arm and arranged to engage the other arm so as to force said arms apart and at the same time the rolls away from each other
  • said force exerting means capable of exerting a prestress force greater than the rolling load developed by said rolls
  • bearing chock assembly having a projection which includes a tapered surface
  • said upper surface of said projection having two opposed tapers
  • said means for applying the prestress force comprises a threaded screw rotatably received in one of said arms at one end thereof,
  • one end of said screw being arranged so as to engage the other arm
  • said force measuring means arranged on the other end of said one arm adapted to engage the other arm
  • said means for applying the initial prestress force includes a yoke arranged inside said housing having an opening through which said shafts extend,
  • bearing assemblies for said shafts mounted in said yoke the bearing assembly of one of said shafts being carried by said yoke and the bearing assembly of the other shaft being discrete from said yoke, and
  • said means for applying the initial prestress force carried by said yoke and adapted to engage said discrete bearing.
  • the constitution being such that the piston cylinder assembly does not interfere with the movement of the bearing chock assembly in said two directions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Rolling Contact Bearings (AREA)
US611692A 1966-02-14 1967-01-25 Rolling mill method and apparatus Expired - Lifetime US3491571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6444/66A GB1177339A (en) 1966-02-14 1966-02-14 Rolling Mill Method and Apparatus

Publications (1)

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US3491571A true US3491571A (en) 1970-01-27

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Application Number Title Priority Date Filing Date
US611692A Expired - Lifetime US3491571A (en) 1966-02-14 1967-01-25 Rolling mill method and apparatus

Country Status (7)

Country Link
US (1) US3491571A (en, 2012)
BE (1) BE693866A (en, 2012)
DE (1) DE1602187A1 (en, 2012)
ES (1) ES336699A1 (en, 2012)
FR (1) FR1511360A (en, 2012)
GB (1) GB1177339A (en, 2012)
NL (1) NL6701801A (en, 2012)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3575028A (en) * 1969-01-28 1971-04-13 Blaw Knox Co Rolling mills
US3577758A (en) * 1969-04-21 1971-05-04 United Eng Foundry Co Apparatus for extracting chocks, guides, and couplings from roll assemblies
US3628366A (en) * 1968-11-26 1971-12-21 Siemag Siegener Masch Bau Rolling mill
US4222258A (en) * 1978-11-17 1980-09-16 Co-Steel International Limited Mill stand
US4653304A (en) * 1984-04-28 1987-03-31 Sms Schloemann-Siemag Ag Rolling stand
EP0154249B1 (de) * 1984-02-28 1989-05-03 Sms Schloemann-Siemag Aktiengesellschaft Walzgerüst mit auf ein Walzentragwellenpaar einseitig (fliegend) aufgesestzten Walzringen
US5056345A (en) * 1988-02-25 1991-10-15 Danieli & C. Officine Meccaniche S.P.A. Rolling stand with rolling rings supported as a cantilever and having their axes at an angle to each other
US20040221637A1 (en) * 2003-05-08 2004-11-11 Titus David G. Triple bearing arrangement for cantilevered roll shafts
CN1301809C (zh) * 2004-04-21 2007-02-28 摩根建设公司 悬臂辊轴的三轴承结构
CN107626741A (zh) * 2017-10-31 2018-01-26 天津旭智机电设备制造有限公司 一种焊丝轧机用辊轮轴

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985012A (en) * 1975-07-28 1976-10-12 The Gleason Works Apparatus for finish rolling bevel pinions and gears

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE875035C (de) * 1950-01-31 1953-04-30 Kocks Gmbh Friedrich Verstellbare Lagerung fuer Walzen, Walz- oder Richtrollen, insbesondere fuer Rundquerschnitte
US3190098A (en) * 1959-02-16 1965-06-22 British Iron Steel Research Cantilever rolling mill
US3327508A (en) * 1963-04-10 1967-06-27 Loewy Eng Co Ltd Rolling mills

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE875035C (de) * 1950-01-31 1953-04-30 Kocks Gmbh Friedrich Verstellbare Lagerung fuer Walzen, Walz- oder Richtrollen, insbesondere fuer Rundquerschnitte
US3190098A (en) * 1959-02-16 1965-06-22 British Iron Steel Research Cantilever rolling mill
US3327508A (en) * 1963-04-10 1967-06-27 Loewy Eng Co Ltd Rolling mills

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628366A (en) * 1968-11-26 1971-12-21 Siemag Siegener Masch Bau Rolling mill
US3575028A (en) * 1969-01-28 1971-04-13 Blaw Knox Co Rolling mills
US3577758A (en) * 1969-04-21 1971-05-04 United Eng Foundry Co Apparatus for extracting chocks, guides, and couplings from roll assemblies
US4222258A (en) * 1978-11-17 1980-09-16 Co-Steel International Limited Mill stand
EP0154249B1 (de) * 1984-02-28 1989-05-03 Sms Schloemann-Siemag Aktiengesellschaft Walzgerüst mit auf ein Walzentragwellenpaar einseitig (fliegend) aufgesestzten Walzringen
US4653304A (en) * 1984-04-28 1987-03-31 Sms Schloemann-Siemag Ag Rolling stand
US5056345A (en) * 1988-02-25 1991-10-15 Danieli & C. Officine Meccaniche S.P.A. Rolling stand with rolling rings supported as a cantilever and having their axes at an angle to each other
US20040221637A1 (en) * 2003-05-08 2004-11-11 Titus David G. Triple bearing arrangement for cantilevered roll shafts
US6959579B2 (en) * 2003-05-08 2005-11-01 Morgan Construction Company Triple bearing arrangement for cantilevered roll shafts
EP1475165A3 (en) * 2003-05-08 2006-03-08 Morgan Construction Company Triple bearing arrangement for cantilevered roll shafts
CN1301809C (zh) * 2004-04-21 2007-02-28 摩根建设公司 悬臂辊轴的三轴承结构
CN107626741A (zh) * 2017-10-31 2018-01-26 天津旭智机电设备制造有限公司 一种焊丝轧机用辊轮轴

Also Published As

Publication number Publication date
ES336699A1 (es) 1968-06-01
DE1602187A1 (de) 1970-03-26
BE693866A (en, 2012) 1967-08-09
NL6701801A (en, 2012) 1967-08-15
GB1177339A (en) 1970-01-07
FR1511360A (fr) 1968-01-26

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Owner name: PITTSBURGH NATIONAL BANK

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP.OF OH;REEL/FRAME:004458/0765

Effective date: 19850610

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Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307

Effective date: 19860630

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Effective date: 19860630