US3645046A - Polishing of strip metal - Google Patents

Polishing of strip metal Download PDF

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US3645046A
US3645046A US888274A US3645046DA US3645046A US 3645046 A US3645046 A US 3645046A US 888274 A US888274 A US 888274A US 3645046D A US3645046D A US 3645046DA US 3645046 A US3645046 A US 3645046A
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strip
abrasive
bridle
rolls
abrasive device
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US888274A
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Kenneth L Bandy
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WEAN IND Inc
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WEAN IND Inc
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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
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP. OH.
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). RECORDED ON REEL 4792 Assignors: WEAN UNITED INC./NOW WEAN INCORPORATED PA CORP.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
    • B24B7/24—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass
    • B24B7/26—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass for simultaneously grinding or polishing opposite faces of continuously travelling sheets or bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work

Definitions

  • the metal strip to be polished is run through spaced drag and pull bridles to establish a tension on the strip portion therebetween.
  • An abrasive device contacts a surface of the tensioned strip portion to polish such surface.
  • the strip is run through the rolls of a leveler to continuously work the strip as it passes from the drag bridle to the abrasive device and thus relieve the strip of stresses and make more effective the tension on the strip so as to present a flat surface to said abrasive device. 1n so passing through the leveler, the strip is also elongated as in the usual tension leveling operation.
  • the strip was not flat, particularly in a longitudinal direction, and I have solved this problem by placing a leveler between the drag bridle and the abrasive device.
  • the strip is presented to the abrasive device in acceptable flat condition, free of any canoeing effect, so that the latter uniformly polishes the strip surface, without an increase in strip tension.
  • the abrasive action on the strip, and the slight bending of the strip about the abrasive device backup roll may form a canoeing configuration in the strip, and my invention further includes the disposition of final bending rolls between the abrasive device and the pull bridle to relieve such undesirable configuration.
  • FIG. 1 is a schematic representation of a strip polishing line, illustrating my invention
  • FIG. 2 is an enlarged fragmentary view of the strip, showing in exaggerated manner, an out-of-flat condition which my invention overcomes, and
  • FIGS. 3 and 4 are fragmentary enlarged details of certain apparatus utilized in the line shown in FIG. 1.
  • the strip S is tensioned between spaced devices which may take any suitable form, and in the preferred embodiment herein disclosed such devices take the form of a drag bridle l and a pull bridle 11. It will be appreciated that other tension producing devices may be employed, such as an uncoiler reel with a drag thereon, and a coiler reel with a pull thereon.
  • the drag and pull bridles are preferred and, as shown, the drag bridle takes the strip from an uncoiler reel 12 and the pull bridle 11 delivers the strip to a coiler reel 14.
  • Abrasive devices 15 and 16 are disposed to effect polishing of the opposite surfaces of the strips S and these devices may be of any commercially available form.
  • each abrasive device comprises an endless abrasive belt 17, such as emery cloth or the like, trained over a pair of rolls 18 and 19, the roll 18 being preferably driven and the roll 19 being an idler roll, so that the endless belt scrubs the strip surface and polishes the same.
  • a backup roll 20 opposes each of the rolls 19 to hold the strip in contact with the abrasive belt.
  • a strip leveler apparatus 21 is interposed between the drag bridle l0 and the abrasive device 15, and a final-bend flattening apparatus 22 is disposed between the abrasive device 16 and the pull bridle II.
  • the leveler 21 may take the form shown in FIG. 3, wherein working rolls 23, 24 engage respective opposite sides of the strip and work the strip to relieve stresses therein.
  • Backup rolls 25, 26 support the respective working rolls against deflection.
  • the working rolls 23, 24 and their backup rolls 25, 26 are carried by respective frames 27, 28 which are relatively adjustable so that the working rolls may be adjusted to vary the amount the strip is worked by the rolls 23, 24.
  • the latter In order to remove any canoeing of the strip which may be caused by the working rolls 23, 24 as they relieve stresses in the strip, the latter is engaged by working rolls 29, 30 as it leaves the rolls 23, 24.
  • the strip has a slight wrap about the backup rolls 20, 20 of the abrasive devices l5, l6 and to remove any canoeing in the strip which may be caused by such wrap, and to relieve any stresses introduced into the strip by the grinding operation, the final-bend flattening apparatus 22 is utilized.
  • This apparatus may comprise working rolls 3], 32 and backup rolls 33, 34 similar to the rolls 23, 24, 25 and 26.
  • the method of polishing the surface of a thin metal strip which comprises passing the strip through a drag bridle and a spaced pull bridle to establish tension on the strip portion between the bridles, contacting a surface of tensioned strip portion with an abrasive device to polish such surface, and continuously passing said tensioned strip portion through the rolls of a leveler before it reaches said abrasive device to relieve stresses in said strip portion and combine with strip tension to present a flat surface to said abrasive device.
  • Apparatus for polishing the surface of a longitudinally moving thin metal strip comprising a drag bridle and pull bridle spaced from said drag bridle, said strip passing from said drag bridle to said pull bridle whereby the strip portion between said bridles is tensioned, an abrasive device having an abrasive surface contacting a surface of said strip portion to polish such surface, and leveling rolls between said drag bridle and said abrasive device, said rolls being arranged to continuously work the strip as it passes from said drag bridle to said abrasive device, whereby stresses in said strip portion are relieved and strip tension more effectively utilized to present a flat surface to said abrasive device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The metal strip to be polished is run through spaced drag and pull bridles to establish a tension on the strip portion therebetween. An abrasive device contacts a surface of the tensioned strip portion to polish such surface. The strip is run through the rolls of a leveler to continuously work the strip as it passes from the drag bridle to the abrasive device and thus relieve the strip of stresses and make more effective the tension on the strip so as to present a flat surface to said abrasive device. In so passing through the leveler, the strip is also elongated as in the usual tension leveling operation.

Description

United States Patent Bandy 5] Feb. 29, 1972 154] POLISHING 0F STRIP METAL [72] Inventor: [73] Assignee: Wean Industries, Inc., Youngstown, Ohio [22] Filed: Dec. 29, 1969 [21] App1.No.: 888,274
Kenneth L. Bandy, Youngstown, Ohio [52] U.S.Cl ..5l/5,51/75,51/323,
[51] Int. Cl ..B24b 7/00 [58] Field of Search ..51/5, 137, 139,74, 75,80 A, 51/323, 324,112, 215 R [56] References Cited UNITED STATES PATENTS Valette et a1. .15 1/5 Nye etal ..51/112 Bond ..51/5
Primary Examiner-William R. Armstrong Attorney-Michae1 Williams [57] 1 ABSTRACT The metal strip to be polished is run through spaced drag and pull bridles to establish a tension on the strip portion therebetween. An abrasive device contacts a surface of the tensioned strip portion to polish such surface. The strip is run through the rolls of a leveler to continuously work the strip as it passes from the drag bridle to the abrasive device and thus relieve the strip of stresses and make more effective the tension on the strip so as to present a flat surface to said abrasive device. 1n so passing through the leveler, the strip is also elongated as in the usual tension leveling operation.
8 Claims, 4 Drawing Figures Patented Feb. 29, 1972 3,645,046
ENTOR. K E NN ET H .BANDT A 7 rams e7 BYZ/wMMW POLISHING OF STRIP METAL BACKGROUND AND SUMMARY Heretofore, insofar as I am aware, the surface of metal strip was polished by contacting one or both surfaces of the strip with abrasive devices while the strip was tensioned therebetween. It was found that the strip was not presented in sufiiciently flat condition to the abrasive device to produce a uniform polishing of the surface and this deficiency was not overcome even by increase of tension to an ultimate limit.
Many attempts have been made to overcome this deficiency,
without beneficial results. The problem encountered in the prior art was that the strip was not flat, particularly in a longitudinal direction, and I have solved this problem by placing a leveler between the drag bridle and the abrasive device. As a result of this solution, the strip is presented to the abrasive device in acceptable flat condition, free of any canoeing effect, so that the latter uniformly polishes the strip surface, without an increase in strip tension. I have further found that the abrasive action on the strip, and the slight bending of the strip about the abrasive device backup roll, may form a canoeing configuration in the strip, and my invention further includes the disposition of final bending rolls between the abrasive device and the pull bridle to relieve such undesirable configuration.
DESCRIPTION OF THE DRAWING In the drawing accompanying this description and forming a part of this specification, there is shown, for purposes of illustration, an embodiment which my invention may assume, and in this drawing:
FIG. 1 is a schematic representation of a strip polishing line, illustrating my invention,
FIG. 2 is an enlarged fragmentary view of the strip, showing in exaggerated manner, an out-of-flat condition which my invention overcomes, and
FIGS. 3 and 4 are fragmentary enlarged details of certain apparatus utilized in the line shown in FIG. 1.
DESCRIPTION OF PREFERRED EMBODIMENT The strip S is tensioned between spaced devices which may take any suitable form, and in the preferred embodiment herein disclosed such devices take the form of a drag bridle l and a pull bridle 11. It will be appreciated that other tension producing devices may be employed, such as an uncoiler reel with a drag thereon, and a coiler reel with a pull thereon.
However, in order to produce controlled tension in the magnitude required, the drag and pull bridles are preferred and, as shown, the drag bridle takes the strip from an uncoiler reel 12 and the pull bridle 11 delivers the strip to a coiler reel 14.
Abrasive devices 15 and 16 are disposed to effect polishing of the opposite surfaces of the strips S and these devices may be of any commercially available form. In the illustrated embodiment each abrasive device comprises an endless abrasive belt 17, such as emery cloth or the like, trained over a pair of rolls 18 and 19, the roll 18 being preferably driven and the roll 19 being an idler roll, so that the endless belt scrubs the strip surface and polishes the same. A backup roll 20 opposes each of the rolls 19 to hold the strip in contact with the abrasive belt.
The foregoing description is illustrative of prior construction wherein drag and pull bridles establish tension on the strip, and this tension has been in the order of 50,000 pounds per square inch. Yet, despite such tension, and even an increase in such tension, it has been found that the strip has not been presented to the abrasive devices 15 and 16 in sufficiently flat condition to produce uniform polishing of the strip surfaces. As seen in FIG. 2, a common out-of-flat condition is illustrated in exaggerated manner, wherein the sheet has a wave formation running longitudinally thereof.
It has been discovered that disposition of strip working rolls between the drag bridle and the abrasive device 15 results in to a desired condition, and this is beflattening of the strip lieved to be brought about by a continuous working of the strip to relieve stresses therein so that the tension force is more effective to straighten the strip.
As shown in FIG. 1, a strip leveler apparatus 21 is interposed between the drag bridle l0 and the abrasive device 15, and a final-bend flattening apparatus 22 is disposed between the abrasive device 16 and the pull bridle II. The leveler 21 may take the form shown in FIG. 3, wherein working rolls 23, 24 engage respective opposite sides of the strip and work the strip to relieve stresses therein. Backup rolls 25, 26 support the respective working rolls against deflection. The working rolls 23, 24 and their backup rolls 25, 26 are carried by respective frames 27, 28 which are relatively adjustable so that the working rolls may be adjusted to vary the amount the strip is worked by the rolls 23, 24.
In order to remove any canoeing of the strip which may be caused by the working rolls 23, 24 as they relieve stresses in the strip, the latter is engaged by working rolls 29, 30 as it leaves the rolls 23, 24. During the abrading operation, the strip has a slight wrap about the backup rolls 20, 20 of the abrasive devices l5, l6 and to remove any canoeing in the strip which may be caused by such wrap, and to relieve any stresses introduced into the strip by the grinding operation, the final-bend flattening apparatus 22 is utilized. This apparatus may comprise working rolls 3], 32 and backup rolls 33, 34 similar to the rolls 23, 24, 25 and 26.
I claim:
1. The method of polishing the surface of a thin metal strip, which comprises passing the strip through a drag bridle and a spaced pull bridle to establish tension on the strip portion between the bridles, contacting a surface of tensioned strip portion with an abrasive device to polish such surface, and continuously passing said tensioned strip portion through the rolls of a leveler before it reaches said abrasive device to relieve stresses in said strip portion and combine with strip tension to present a flat surface to said abrasive device.
2. The method of claim 1 and including the step of passing said strip portion through bending rolls located between said abrasive device and said pull bridle to remove canoeing and to relieve stresses set up in said strip by the abrasive action.
3. The method of claim 1 wherein opposite surfaces of said strip portion are contacted by abrasive devices to polish both surfaces of said strip.
4. The method of claim 1 wherein said strip is engaged by working rolls as said strip portion leaves said leveler rolls and before it reaches said abrasive device to remove any canoeing of the strip which may be caused by the leveler operation.
5. Apparatus for polishing the surface of a longitudinally moving thin metal strip, comprising a drag bridle and pull bridle spaced from said drag bridle, said strip passing from said drag bridle to said pull bridle whereby the strip portion between said bridles is tensioned, an abrasive device having an abrasive surface contacting a surface of said strip portion to polish such surface, and leveling rolls between said drag bridle and said abrasive device, said rolls being arranged to continuously work the strip as it passes from said drag bridle to said abrasive device, whereby stresses in said strip portion are relieved and strip tension more effectively utilized to present a flat surface to said abrasive device.
6. Apparatus according to claim 5 and further including strip bending rolls located between said abrasive device and said pull bridle to remove canoeing and to relieve stresses in the strip caused by the abrasive action.
7. Apparatus according to claim 5 wherein abrasive devices contact opposite surfaces of the strip to polish the same.
8. Apparatus according to claim 5 wherein said strip is engaged by working rolls as said strip portion leaves said leveling rolls and before it reaches said abrasive device to remove any canoeing of the strip which may be caused by the strip leveling operation.

Claims (8)

1. The method of polishing the surface of a thin metal strip, which comprises passing the strip through a drag bridle and a spaced pull bridle to establish tension on the strip portion between the bridles, contacting a surface of tensioned strip portion with an abrasive device to polish such surface, and continuously passing said tensioned strip portion through the rolls of a leveler before it reaches said abrasive device to relieve stresses in said strip portion and combine with strip tension to present a flat surface to said abrasive device.
2. The method of claim 1 and including the step of passing said strip portion through bending rolls located between said abrasive device and said pull bridle to remove canoeing and to relieve stresses set up in said strip by the abrasive action.
3. The method of claim 1 wherein opposite surfaces of said strip portion are contacted by abrasive devices to polish both surfaces of said strip.
4. The method of claim 1 wherein said strip is engaged by working rolls as said strip portion leaves said leveler rolls and before it reaches said abrasive device to remove any canoeing of the strip which may be caused by the leveler operation.
5. Apparatus for polishing the surface of a longitudinally moving thin metal strip, comprising a drag bridle and pull brIdle spaced from said drag bridle, said strip passing from said drag bridle to said pull bridle whereby the strip portion between said bridles is tensioned, an abrasive device having an abrasive surface contacting a surface of said strip portion to polish such surface, and leveling rolls between said drag bridle and said abrasive device, said rolls being arranged to continuously work the strip as it passes from said drag bridle to said abrasive device, whereby stresses in said strip portion are relieved and strip tension more effectively utilized to present a flat surface to said abrasive device.
6. Apparatus according to claim 5 and further including strip bending rolls located between said abrasive device and said pull bridle to remove canoeing and to relieve stresses in the strip caused by the abrasive action.
7. Apparatus according to claim 5 wherein abrasive devices contact opposite surfaces of the strip to polish the same.
8. Apparatus according to claim 5 wherein said strip is engaged by working rolls as said strip portion leaves said leveling rolls and before it reaches said abrasive device to remove any canoeing of the strip which may be caused by the strip leveling operation.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768208A (en) * 1969-01-07 1973-10-30 Western Electric Co Rolling and burnishing of contact surfaces
US6439883B1 (en) * 2000-04-11 2002-08-27 Ajax Magnethermic Corporation Threading and scale removal device
US20070044531A1 (en) * 2005-08-31 2007-03-01 Red Bud Industries, Inc. Method and apparatus for conditioning sheet metal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768208A (en) * 1969-01-07 1973-10-30 Western Electric Co Rolling and burnishing of contact surfaces
US6439883B1 (en) * 2000-04-11 2002-08-27 Ajax Magnethermic Corporation Threading and scale removal device
US20070044531A1 (en) * 2005-08-31 2007-03-01 Red Bud Industries, Inc. Method and apparatus for conditioning sheet metal

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