US3616669A - Method of and apparatus for rolling flat strip - Google Patents
Method of and apparatus for rolling flat strip Download PDFInfo
- Publication number
- US3616669A US3616669A US833045A US3616669DA US3616669A US 3616669 A US3616669 A US 3616669A US 833045 A US833045 A US 833045A US 3616669D A US3616669D A US 3616669DA US 3616669 A US3616669 A US 3616669A
- Authority
- US
- United States
- Prior art keywords
- strip
- rolls
- roll
- opposite sides
- work
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
- B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
-
- 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
- B21B2031/206—Horizontal offset of work rolls
Definitions
- the strip is caused to alternately wrap around a portion of each work roll in a manner to effect an overall reduction in the thickness of the strip by compression from the rolls, and at the same time subject the opposite sides of the strip as they come into contact with the work rolls alternately to a tension force sufficient to elongate by tension the opposite sides of the strip.
- the disclosure includes a roll heating and cooling system for varying the crown of the work rolls and hence, the amount of the tension force alternately imposed on the opposite sides of the strip in order to change the degree of elongation transversely across the strip.
- This invention relates to a method of and apparatus for processing strip-like material; for example, the rolling of steel or aluminum strips.
- the object of the present invention to provide a method of and apparatus for producing a strip characterized by substantial flatness obtained not by a separate processing strip, but as a function of the reducing, tempering skin pass rolling or leveling of the strip.
- FIG. 1 is an elevational section view of a 4-high mill incorporating the present invention
- FIG. 2 is a diagrammatic plane view of one form of the crown control apparatus that forms part of the invention
- FIG. 3 is a perspective view of one of non-flat condition of a strip that is to be corrected by the practice of the invention
- FIG. 4 is a partial view of the work rolls of FIG. 1 illustrating by the solid lines in exaggerated form the roll condition that creates the non-flatness illustrated in FIG. 3 and by the dotted lines what correction must be made to remove the non-flatness.
- FIG. 4a is a sectional view taken on lines 4a4a of FIG. 4, illustrating in solid line the rolls of FIG. 4 and in dotted lines what takes place by the practice of the present invention in correcting for the non-fiat strip condition,
- FIG. 5 is a perspective view of a second non-flat condition of a strip
- FIG. -6 is a partial view of the work rolls of FIG. 1 illustrating by the solid line in exaggerated form the roll condition that creates the non-flatness shown in FIG. 5 and by dotted lines what correction must be effected to correct for the non-flatness, and
- FIG. 6a is a sectional view taken on lines 6a-6a of FIG. 6 illustrating in solid lines the rolls of FIG. 6 and in dotted lines what takes place by the practice of the present invention to correct for the non-flat strip condition.
- Buckle describes a deflection of the strip at its center, which, while they usually take the form of either a down-buckle or an up-buckle, on certain occasions they alternate as downand up-buckles or vice-versa,
- uniform wave describes one or both edges of the strip where the deflections of the strip take the form of a sine curve
- (0) scallop is a condition on one or both edges, but
- (d) by a crown is meant the increase or decrease of a radial section of the roll body in engagement with the strip.
- the fundamental purpose of the present invention has to do with a method of and apparatus for rolling metallic strip in a manner whereby, simultaneously with the reductions caused by compression from the work rolls, a given section of the strip being reduced by compression is subject also to a tension force in a manner that the opposite sides are alternated and, if desirable, differentially elongated and wherein the degree and application of the tension force transversely of the strip can be accurately varied by adjusting the crown of one or more of the rolls so that the tension force can be applied with reference to the extent and exact nature of the non-fiat characteristic of the strip, i.e., whether it is a wave, buckle, or scallop and, as to the latter two, the direction of deflection of the strip.
- FIG. 1 there is illustrated diagrammatically a rolling mill housing 11 which receives a pair of backup rolls 12 and 13 for supporting work rolls 14 and 15; thus, constituting the mill a 4-inch mill.
- the rolls are received in and supported by customary bearing chock assemblies and that the upper rolls 12 and 14 are adjustable within the housing towards and away from the lower rolls 13 and 15 by a screw-down mechanism, according to well-known practice.
- the bearing chock assemblies of the work assemblies 14 and 15 are so constructed and arranged with respect to the housing and/or the bearing chock assemblies of the backup rolls 12 and 13 that they are held in a predetermined offset relationship with respect to a vertical plane containing the axes of the backup rolls 12 and 13.
- FIG. 1 shows this ofiset condition in an exaggerated form as it does with respect to the strip passing between the work rolls 14 and 15.
- these nozzles are adapted to admit into the gap formed by the roll sets, and continuously along such gap, a discharge of either a heating or cooling medium, say, for example, water.
- the nozzles are arranged so that the outer two constitute a pair 16a as do the next adjacent inner ones 16b, while the center one 160 is independent of the other two sets.
- Each set of sprays as well as the center spray 160 is connected to valves 18, 19 and 21 which, in turn, through headers 22 and 23 are connected to heat exchangers in the form of a medium cooling unit 24 and medium heating unit 25; the heat exchangers, in turn, being connected to a pumping system and reservoir not shown.
- FIGS. 3, 4 and 4a and FIGS. 5, 6 and 6a are designed to illustrate both the reduction of the strip by compression from the work rolls 14 and 15 and the correcting effect of the elongation by controlling the crown of the rolls for two different strip non-flat conditions.
- the encircling effect of the strip with respect to the work rolls impose differential tensions on the strip with respect to the two opposite sides, which differential tensions alternate from one side to the other depending on whether the side is caused to be placed under compression or tension as it is forced to wrap around the work rolls.
- buckles where they generally consist of an upward or downward deflection from the body of the strip, by increasing the crown on one roll and allowing the crown to remain unchanged on the other or reducing the crown on the other roll, the elongatiorrs can be controlled to be related exactly to the direction of deflection of the strip.
- FIGS. 3, 4 and 4a where there is shown a greatly exaggerated representation of the rolling action between the work rolls 14 and 15.
- the hard-line representations of FIGS. 4 and 4a are designed to portray a condition Where the work rolls 14 and 15 are crowned to the same extent and that under these conditions a wave is formed in the strip issuing from the rolls.
- this wave is a result of the rolls not being properly crowned for the particular rolling load generated by the reduction being taken.
- the waved condition will be observed either by the operator or by some apparatus designed to 'detect the presence of a wave.
- the operator examining this condition has the option of either increasing the crown in the center of the Work rolls 14 and 15 or decreasing the crowns at the edges or doing both, but in a lesser amount.
- FIGS. 4 and 4a An application of the coolant or heating medium in the above manner with respect to changing the crown at the center of the roll or rolls 14 and 15 is illustrated in dotted lines in FIGS. 4 and 4a, where it is shown that the rolls 14 and 15 have increased in diameter at the centers while the ends remain unchanged.
- FIGS. 5, 6 and 6a are addressed to a buckled condition where the buckles deflect upwardly.
- the general analysis is similar to the wave condition described with reference to FIGS. 3, 4 and 4a, except that with the buckled condition, the operator of the apparatus employed must also determine the direction of the deflection of the buckles-in this case upward deflection.
- the operator has the option to either decrease the crown at the center of the roll 15 or increase the crown at the center of the roll 14 and increase the crown of the rolls 14 and 15 at these ends by operation of the valves 18, 19 or 21.
- FIG. 4a has been provided with certain letter identifications for the purpose of allowing ready reference to the various arcs formed by the engagement of the strip with the rolls 14 and 15.
- the offset between the axes of the work rolls 14 and 15 is /2 inch with a work roll radius of 9 inches and the angle of CD of 3.2 degrees having a sine of .0556, the length of the are where t is the incoming thickness of the strip, which is the same as the sine of the arc CD; likewise, the length of the arc DEBF where t is the final thickness of the strip, and is the same as the sine of the first angle.
- the elongation of the bottom surface AB is 5 /2 percent more than the top surface CD.
- the elongation of the top surface DE is 5% percent more than the bottom surface BF.
- valve 19 connected to the heat exchangers 24 and 25 delivering 100 F. and 150 F., respectively, valve 19 will deliver a medium temperature of 125 P. which represents the mean temperature of the discharge of the heat exchangers and that the medium issuing from valves 18 and 21 is also 125 F. If the particular non-flat condition is one of wavy edges, i.e., the edges are being overrolled by improperly crowned rolls, the valve 21 will be caused to emit fluid at 110 F. (80 percent at 100 F. +20 percent of 150 F.) and the valve 18 will be changed to emit fluid at 140 F. which represents (20 percent at 100 F.
- the method and apparatus of the present invention may be practiced to level the strip where no reduction is imparted by compression between the rolls.
- the elongation of the bottom fibers of the strip is caused by the bending action of the top roll 14, i.e., the strip side AB and the elongation of the top fibers of the strip is caused by the bending action of the lower roll 15, i.e., the side of the strip DE.
- the compression between points D and B is held below the yield strength of the material and hence is not suflicient to impart any reduction.
- the degree and application of the tension on one or both sides of the strip is similar to what has already been described above and is effected by the control of the crown or crowns of one or both of the rolls.
- each work roll is backed up by a backup roll
- each backup roll means for mounting each backup roll so that their axes fall in substantially the vertical planes containing the aXes of their cooperative work rolls.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US83304569A | 1969-06-13 | 1969-06-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3616669A true US3616669A (en) | 1971-11-02 |
Family
ID=25263270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US833045A Expired - Lifetime US3616669A (en) | 1969-06-13 | 1969-06-13 | Method of and apparatus for rolling flat strip |
Country Status (4)
Country | Link |
---|---|
US (1) | US3616669A (en) |
JP (1) | JPS4915540B1 (en) |
CA (1) | CA957531A (en) |
GB (1) | GB1316786A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3841132A (en) * | 1971-09-14 | 1974-10-15 | Lysaght Ltd John | Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point |
US4023391A (en) * | 1974-03-20 | 1977-05-17 | Nippon Steel Corporation | Method of and apparatus for controlling the shape of rolled objects in the rolling of plate, sheet, strip and the like |
EP0049425A2 (en) * | 1980-10-04 | 1982-04-14 | Sms Schloemann-Siemag Aktiengesellschaft | Method and device for the rolling of strips, free of stress |
US4467629A (en) * | 1981-10-02 | 1984-08-28 | Sms Schloemann-Siemag Ag | Method of flattening steel strip in rolling mill |
US4541263A (en) * | 1983-04-21 | 1985-09-17 | Kramatorsky Industrialny Institut | Roll mill stand |
US4612788A (en) * | 1985-11-15 | 1986-09-23 | Kabushiki Kaisha Kobe Seiko Sho | Method for controlling shape of material in rolling process |
US4781050A (en) * | 1982-01-21 | 1988-11-01 | Olin Corporation | Process and apparatus for producing high reduction in soft metal materials |
EP0315694A1 (en) * | 1987-05-26 | 1989-05-17 | Nippon Kokan Kabushiki Kaisha | Hot rolling method and equipment for fragile strip |
EP0381756A1 (en) * | 1987-03-06 | 1990-08-16 | Nippon Kokan Kabushiki Kaisha | Hot rolling equipment for strip coils |
US5195344A (en) * | 1987-03-06 | 1993-03-23 | Nippon Kokan Kabushiki Kaisha | Warm rolling facility for steel strip coils |
US5755054A (en) * | 1997-03-26 | 1998-05-26 | Crosman Corporation | Trigger blocking device |
CN1050784C (en) * | 1993-11-02 | 2000-03-29 | Sms舒路曼-斯玛公司 | Apparatus for cold rolling belt |
US6675623B2 (en) * | 2001-07-13 | 2004-01-13 | The Furukawa Electric Co., Ltd. | Method and apparatus for manufacturing keystone type superconducting compacted stranded wires |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0216869U (en) * | 1988-07-19 | 1990-02-02 | ||
KR102121677B1 (en) * | 2015-09-21 | 2020-06-11 | 노벨리스 인크. | Preheating and thermal control of work rolls in metal rolling process and its control system |
-
1969
- 1969-06-13 US US833045A patent/US3616669A/en not_active Expired - Lifetime
-
1970
- 1970-05-11 CA CA082,369A patent/CA957531A/en not_active Expired
- 1970-06-11 GB GB2826670A patent/GB1316786A/en not_active Expired
- 1970-06-12 JP JP45050389A patent/JPS4915540B1/ja active Pending
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3841132A (en) * | 1971-09-14 | 1974-10-15 | Lysaght Ltd John | Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point |
US4023391A (en) * | 1974-03-20 | 1977-05-17 | Nippon Steel Corporation | Method of and apparatus for controlling the shape of rolled objects in the rolling of plate, sheet, strip and the like |
EP0049425A2 (en) * | 1980-10-04 | 1982-04-14 | Sms Schloemann-Siemag Aktiengesellschaft | Method and device for the rolling of strips, free of stress |
EP0049425A3 (en) * | 1980-10-04 | 1983-01-26 | Sms Schloemann-Siemag Aktiengesellschaft | Method and device for the rolling of strips, free of stress |
US4467629A (en) * | 1981-10-02 | 1984-08-28 | Sms Schloemann-Siemag Ag | Method of flattening steel strip in rolling mill |
US4781050A (en) * | 1982-01-21 | 1988-11-01 | Olin Corporation | Process and apparatus for producing high reduction in soft metal materials |
US4541263A (en) * | 1983-04-21 | 1985-09-17 | Kramatorsky Industrialny Institut | Roll mill stand |
US4612788A (en) * | 1985-11-15 | 1986-09-23 | Kabushiki Kaisha Kobe Seiko Sho | Method for controlling shape of material in rolling process |
US5195344A (en) * | 1987-03-06 | 1993-03-23 | Nippon Kokan Kabushiki Kaisha | Warm rolling facility for steel strip coils |
EP0381756A1 (en) * | 1987-03-06 | 1990-08-16 | Nippon Kokan Kabushiki Kaisha | Hot rolling equipment for strip coils |
EP0381756A4 (en) * | 1987-03-06 | 1991-09-11 | Nippon Kokan Kabushiki Kaisha | Hot rolling equipment for strip coils |
EP0315694A4 (en) * | 1987-05-26 | 1989-10-04 | Nippon Kokan Kk | Hot rolling method and equipment for fragile strip. |
EP0315694A1 (en) * | 1987-05-26 | 1989-05-17 | Nippon Kokan Kabushiki Kaisha | Hot rolling method and equipment for fragile strip |
CN1050784C (en) * | 1993-11-02 | 2000-03-29 | Sms舒路曼-斯玛公司 | Apparatus for cold rolling belt |
US5755054A (en) * | 1997-03-26 | 1998-05-26 | Crosman Corporation | Trigger blocking device |
US6675623B2 (en) * | 2001-07-13 | 2004-01-13 | The Furukawa Electric Co., Ltd. | Method and apparatus for manufacturing keystone type superconducting compacted stranded wires |
Also Published As
Publication number | Publication date |
---|---|
JPS4915540B1 (en) | 1974-04-16 |
GB1316786A (en) | 1973-05-16 |
CA957531A (en) | 1974-11-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
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 |
|
AS | Assignment |
Owner name: PITTSBURGH NATIONAL BANK,PENNSYLVANIA Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307 Effective date: 19860630 Owner name: PITTSBURGH NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307 Effective date: 19860630 |
|
AS | Assignment |
Owner name: UNITED ENGINEERING ROLLING MILLS, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WEAN INCORPORATED;REEL/FRAME:004920/0256 Effective date: 19880610 |