US3759078A - Roll supporting means for a rolling mill - Google Patents

Roll supporting means for a rolling mill Download PDF

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Publication number
US3759078A
US3759078A US00257507A US3759078DA US3759078A US 3759078 A US3759078 A US 3759078A US 00257507 A US00257507 A US 00257507A US 3759078D A US3759078D A US 3759078DA US 3759078 A US3759078 A US 3759078A
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US
United States
Prior art keywords
chocks
roll
rolling mill
rolls
supporting means
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
US00257507A
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English (en)
Inventor
F Rotter
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.)
Siemag Siegener Maschinenbau GmbH
Original Assignee
Siemag Siegener Maschinenbau GmbH
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 Siemag Siegener Maschinenbau GmbH filed Critical Siemag Siegener Maschinenbau GmbH
Application granted granted Critical
Publication of US3759078A publication Critical patent/US3759078A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/203—Balancing rolls
    • 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
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing
    • B21B31/106—Vertical displacement of rolls or roll chocks during horizontal roll changing

Definitions

  • ABSTRACT The disclosure pertains to a rolling mill having balance piston cylinder assemblies arranged in the lower work roll bearing chocks and extending towards and engaging the cooperative bearing chocks of the upper work roll.
  • a supporting pressure for the piston cylinder assemblies is generated by hydrostatic compression of elastomers, self-contained within the cylinders, which material has a prestressed pressure larger than the combined weights of the upper work roll and its chocks which it is designed to support during roll changing of the rolls.
  • This invention relates to a quick work roll change mechanism for a rolling mill stand, whereby the work rolls are maintained separated during the installing and removing processes, but yet transported as a unit with the top roll and its chocks being supported by the chocks of the bottom roll. In this manner the surfaces of the work rolls do not come into contact with each other, thereby avoiding marking when installed in or removed from the mill stand.
  • the chocks of the work rolls with projections or extensions on their surfaces facing each other, which during the normal rolling operation are capable of projecting into pocket-like indentations of the other corresponding chock.
  • the upper work roll with its chocks is raised to such an extent that the projections are completely withdrawn from the pocket-like indentations.
  • the bottom roll with its chocks is then slightly displaced laterally parallel to its longitudinal axis before the upper work roll with its chocks is lowered.
  • the projections of the upper chocks touch down on a flat surface of the other chock located sideways to the pocket-like indentations to bring about, on the one hand, a maintenance of distance between the surfaces of both work rolls, and on the other hand, the firm support of the upper work roll with its chocks by the chocks of the bottom roll.
  • the object of the present invention is to provide a construction for the work rolls quick-change mechanisms for roll stands which will during the installing and removing process of a set of work rolls automatically maintain at a distance the surfaces of the work rolls effecting, thereby, a firm support of the upper work rolls with its chocks by the chocks of the bottom work roll.
  • the solution of this object consists firstly in that the supporting components of the chocks are constructed as prestressed cushions of hydrostatic compressionof elastomers whose common initial working or supporting force is larger than the weight of a work roll with its chocks.
  • Such prestressed cushions working with an hydrostatic compression of elastomers are available to the trade under the trade name of JARRET manufactured by Domange-Jarret of Paris, France, who is also represented by Rotator Products Ltd., 464 McNicoll Ave., Willowdale, Ontario, Canada.
  • These cushions or force limiters can be provided with a high initial stress or energy through the internal initial pressure of the elastomer which, in accordance with the invention, is utilized to support the weight of the upper work roll with its chocks; thus, lifting the surfaces of the work rolls from each other and creating thereby an automatic firm support of the upper work roll with its chocks by the chocks of the bottom work roll.
  • a further characteristic of the invention is that the cushions or force limiters are installed in the plungers of the work roll balance piston cylinder assemblies of the mill.
  • the cushions or force limiters can consist of a self-contained cylinder containing an elastomer and a plunger piston penetrating into the elastomer.
  • the plunger pistons of the cushions or force limiters include a mechanical detent, at least for their extended final position. In this way it is assured that all cushions or force limiters rest at a same level in their extended final position creating thus a firm support for the set of work rolls.
  • the plungers of the work roll balance piston cylinder assemblies engage with centering disks located in indentations of the upper work roll chocks.
  • FIG. 1 a partial sectional side view of the roll assem bly supporting mechanism in which the rolls and mechanism are shown in their roll changing positions;
  • FIG. 2 an enlarged view of one of the supporting mechanisms shown in FIG. 1;
  • FIG. 3 a view similar to FIG. 2, but illustrating the position of the supporting mechanism during the rolling operation.
  • FIG. 1 there is shown an indication of one of two housings 1 of a roll stand'in whose windowZ there is supported a chock 3 for the upper work roll 4 and a chock 5 for the bottom work roll 6, according to wellknown practice.
  • a similar chock arrangement, while not shown, will be provided for the other housing.
  • the set of work rolls 4, 6 together with its chocks 3, S are designed to be removed from and installed with the windows of the housings for the purpose of roll changing in which the rolls, as a unit, are axially moved relative to the roll stand 1.
  • the upper work roll chocks 3 are supported on the bottom work roll chocks 5 at such a distance that both work rolls 4 and 6 are prevented from touching each other. It is important, as noted previously, that during the changing of the rolls a positively supported and stable work roll set be obtained.
  • each upper work roll chock 3 and the bottom work roll chock 5 there are utilized as supporting components between each upper work roll chock 3 and the bottom work roll chock 5 two prestressed cushions 7 of the hydrostatic compression of elastomer type which, as noted before, are available on the market as JARRET springs, stress limiters or buffers.
  • Each of these cushions consists of a self-contained cylinder 8, in which there is positioned an elastomer 9, and of a plunger piston 10 arranged to penetrate into the elastomer 9.
  • Elastomers as is well known, belong to a large family of macromolecular materials having a wide range of elasticity, that is to say, an important elastic recovery and at the same time an exceptional aptitude for deformation.
  • These natural, organic or synthetic materials have a putty-like consistency and are capable, therefore, of being displaced to a certain extent in a liquid manner during the penetration of the plunger piston 10 into the cylinder 8 due to the effect of the compression created by the piston.
  • the elastomer 9 is positioned in the cylinder 8 under such an initial stress that it tends to maintain the plunger piston 10 with substantial force at the bottom of the cylinder 8 as indicated in FIG. 2.
  • This common initial stress force of the elastomer 9 in all four cylinders 8 of the four chocks is greater than the net weight of the upper work roll 4 and both of its chocks 3. Due to the initial stress of the elastomers 9 in the cylinders 8, the upper work roll 4 with both of its chocks 3 is therefore completely and automatically lifted away from the bottom work roll 6 and both of its chocks 5 until the lower piston surfaces 11 of the plunger pistons 10 mechanically rest against the lower ends 12 of the cylinders 8 which serve as detents. Thus, a firm position for the set of work rolls is assured during the installing and removing process.
  • the initial stress force of the elastomer 9 in the cylinders 8 can, however, be overcome by means of the well-known screwdown devices of the roll stands during the rolling operation, the lowering of the upper roll 4 by causing each of the plunger pistons 11 to penetrate deeper into the elastomer 9 and that the latter flows at a slight increase of the initial stress force along the plunger piston 10 into the lower part of the cylinder 8, as shown in FIG. 3.
  • the increased initial stress force of the elastomer 9 will have the effect of pushing back the plunger piston l into its initial position, as shown in FIG. 2. In this way, not only can both work rolls 4 and 6 with their chocks 3 and be joined again in a firm supporting position for their installing and removing, but a balancing of the upper roll can be effected during rolling.
  • each cylinder 8 of the cushion 7 is mounted in the plunger 13 of the work roll balance piston cylinder assembly which penetrates into the balancing cylinder 14 in the bottom work roll chock 5.
  • the piston plunger of the cushion 7 is connected to and supported by the bottom of the balancing cylinder 14.
  • the cushions 7 constructed as force limiters or stops also assist during the rolling operation with the balancing of the upper work roll until the piston plunger 10 comes to a rest with its lower piston surface 11 on the lower end of the cylinder 8. Only at this moment is there effected the balancing of the upper work roll 4 in the customary manner by means of the plungers 13 driven by fluid in the balancing cylinders 14.
  • FIGS. 2 and 3 of the drawing shows that the plungers 13 of the work roll balance are provided with centering disks 15 at their free extremities which snugly fit into adapted indentations 16 of the upper work roll chocks 3.
  • This arrangement is especially adequate during the installing and removing of the sets of work rolls since it exactly positions the upper work roll 4 with its chocks 3 in relation to the chocks 5 of the bottom work roll 6.
  • the special advantage of the work roll quick change mechanism in accordance with the invention is that without additional manipulations subsequent to the raising of the screwdown devices the work rolls 4 and 6 with their chocks 3 and 5 automatically attain their supporting position in regard to each other for the installing and removing of the roll set.
  • a further advantage is that the supporting components, installed to obtain this advantage, can be installed in the work roll balance cylinders and that they can, at least partially, aid in the balancing process for the upper work roll 4.
  • a rolling mill having an upper and lower roll, each being carried by bearing chocks arranged at opposite ends of the rolls, in which the chocks on corresponding ends of the rolls oppose each other and form cooperative pairs,
  • said supporting means including an hydrostatic compression elastomer having an initial prestressed pressure larger than combined weights of the upper roll and its bearing chocks.
  • said supporting means comprises a pair of means for each cooperative pair of chocks and in which said supporting means is arranged in the chocks of said lower roll and adapted to support said upper roll and its chocks.
  • said supporting means arranged in the pistons of said piston cylinder assemblies and including means functioning as force limiting devices for said supporting means.
  • each piston cylinder assembly includes an internal cylinder formed in the piston of said piston cylinder assembly into which said internal cylinder said elastomer is received,
  • a plunger received in said internal cylinder arranged to penetrate said elastomer.
  • said upper chocks are provided with indentations and the pistons of said piston cylinder assemblies are provided 6 with centering means for each of said pistons arranged piston thereof towards said opposed chock for the purto be rece'ved by Sam mdemat'ons' pose of balancing the roll associated with said opposed 7.
  • said balance piston cylinder assemblies each include a chamber for receiving pressurized fluid to displace said 5 chock.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Fluid-Damping Devices (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00257507A 1971-06-26 1972-05-30 Roll supporting means for a rolling mill Expired - Lifetime US3759078A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2131882A DE2131882C3 (de) 1971-06-26 1971-06-26 Stutzeinrichtung fur Arbeitswalzen beim Walzenwechsel in Walzgerüsten

Publications (1)

Publication Number Publication Date
US3759078A true US3759078A (en) 1973-09-18

Family

ID=5811917

Family Applications (1)

Application Number Title Priority Date Filing Date
US00257507A Expired - Lifetime US3759078A (en) 1971-06-26 1972-05-30 Roll supporting means for a rolling mill

Country Status (6)

Country Link
US (1) US3759078A (show.php)
JP (1) JPS5517641B1 (show.php)
BE (1) BE785232A (show.php)
DE (1) DE2131882C3 (show.php)
FR (1) FR2143751B1 (show.php)
IT (1) IT956728B (show.php)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533989A (en) * 1980-03-10 1985-08-06 Sprague Electric Company Transformerless power inverter with only one type transistors
EP1227899A4 (en) * 1999-06-25 2003-05-07 Ind Automation Serv Pty Ltd VIBRATION DAMPING APPARATUS
US8578749B2 (en) 2010-04-09 2013-11-12 Sms Siemag Aktiengesellschaft Method for the flying changing of working rolls in continuous casting and rolling installations and hot strip rolling mills using a hold-down roller
CN107282643A (zh) * 2016-04-04 2017-10-24 鞍钢股份有限公司 一种精轧下工作辊断辊处理方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2437050C2 (de) * 1974-08-01 1984-08-09 SMS Schloemann-Siemag AG, 4000 Düsseldorf Vorrichtung in einem Walzgerüst zum Abstützen der Arbeitswalzeneinbaustücke beim Walzenwechsel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541830A (en) * 1967-05-29 1970-11-24 Siegener Maschinenbau Gmbh Rolling mill roll changing
US3589161A (en) * 1969-07-22 1971-06-29 Gulf & Western Ind Prod Co Work roll automatic spacing means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541830A (en) * 1967-05-29 1970-11-24 Siegener Maschinenbau Gmbh Rolling mill roll changing
US3589161A (en) * 1969-07-22 1971-06-29 Gulf & Western Ind Prod Co Work roll automatic spacing means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533989A (en) * 1980-03-10 1985-08-06 Sprague Electric Company Transformerless power inverter with only one type transistors
EP1227899A4 (en) * 1999-06-25 2003-05-07 Ind Automation Serv Pty Ltd VIBRATION DAMPING APPARATUS
US6763694B1 (en) 1999-06-25 2004-07-20 Industrial Automation Services Pty Ltd Vibration damping apparatus
US8578749B2 (en) 2010-04-09 2013-11-12 Sms Siemag Aktiengesellschaft Method for the flying changing of working rolls in continuous casting and rolling installations and hot strip rolling mills using a hold-down roller
CN107282643A (zh) * 2016-04-04 2017-10-24 鞍钢股份有限公司 一种精轧下工作辊断辊处理方法

Also Published As

Publication number Publication date
FR2143751B1 (show.php) 1977-08-26
DE2131882C3 (de) 1980-04-24
JPS5517641B1 (show.php) 1980-05-13
DE2131882A1 (de) 1973-01-11
FR2143751A1 (show.php) 1973-02-09
DE2131882B2 (de) 1975-10-23
IT956728B (it) 1973-10-10
BE785232A (fr) 1972-10-16

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