Metal deforming – By deflecting successively-presented portions of work during... – By use of deflected arranged to provide longitudinally...
Reexamination Certificate
2000-03-15
2001-11-20
Crane, Daniel C. (Department: 3725)
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflected arranged to provide longitudinally...
C072S205000
Reexamination Certificate
active
06318141
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a roller leveller, and more particularly to a roller leveller for correcting a defective shape of a plate.
In this specification, a metal plate and a metal coil plate are collectively called a plate. Also in this specification, removing (mitigating) a camber and forming (emphasizing) a camber are collectively called camber correction.
BACKGROUND ART
Flatness defects of plates are roughly classified into shape defects and warp defects. Warp defects can be corrected by a conventional roller leveller using cylindrical rollers. Shape defects are formed by differences of elongation in a longitudinal direction of a plate, and cannot be corrected unless plastic elongation or shrink is given to the plate in the longitudinal direction. Of such shape defects, a large curve of a plate in the lateral direction is called a camber.
A conventional roller leveller uses cylindrical rollers disposed in a zigzag way as upper and lower roller groups and repeatedly applies a bending force to a plate or coil plate (plate) to remove distortion. This roller leveller can correct warp defects of a plate.
Various methods have been proposed in order to remove a camber of a plate (for example, refer to Japanese Patent Publication No. 7-29137 “Camber Straightener”, Japanese Utility Model Laid-open Publication No. 4-17310 “Straightener for Camber”, and Japanese Patent Publication No. 61-54484 “Roller Leveller”). However, all of these methods require to change settings of a roller leveller depending upon whether the direction of a camber is right or left.
A tension leveller by which a steel coil is processed with tension being applied is effective for correcting a camber of a steel coil. The tension leveller can correct the shape of a workpiece (coil plate) by applying plastic elongation to it in the longitudinal direction. However, although the tension leveller can be applied to a relatively thin coil plate, it cannot be applied to a thick coil plate and a sheet.
It is conceivable that a camber of a wide plate can be corrected by applying a bending moment to the plate in a lateral direction in its plane. However, if a camber correcting bending moment is applied to a thin and wide plate, torsional buckling of the plate occurs before a sufficient bending moment is applied. The bending moment sufficient for correcting the camber cannot therefore be applied.
This bending work for camber straightening is unstable and cannot be used in practice for straightening the camber (for example, refer to “Strength of Materials” by Kansei Ono, published by Maruzen Publishing Co., in Item of Thin Beam, at p. 156). A conventional roller leveller cannot straighten a camber of a plate, although it can correct warp defects of a plate.
It is difficult to straighten a camber. Instead of straightening a camber, both lugs of a plate in the longitudinal direction are cut out or cut away to narrow the plate width and remove the camber. With this method, however, a manufacture yield of plates is reduced.
DISCLOSURE OF THE INVENTION
An object of the invention is to provide a roller leveller capable of correcting a camber.
Another object of the invention is to provide a roller leveller capable of straightening a camber of a plate at fixed settings of the leveller irrespective of right or left direction of the camber.
Another object of the invention is to provide a roller leveller capable of straightening a warp or camber defect of a plate at fixed settings of the leveller irrespective of upward or downward direction of the warp defect and of right or left direction of the camber of the plate.
Still another object of the invention is to provide a roller leveller capable of giving a camber to a plate.
According to one aspect of the present invention, there is provided a roller leveller for working a plate, comprising: a plurality of upper taper rollers each having a large diameter end and a small diameter end with a collar, the large diameter ends being set on a same side, the small diameter ends being set on other side, and lower generating lines being disposed in parallel to a horizontal plane; and a plurality of lower taper rollers each having a large diameter end and a small diameter end with a collar, the large diameter ends being set on a same side, the small diameter ends being set on other side, upper generating lines being disposed in parallel to a horizontal plane, the upper taper rollers and the lower taper rollers being disposed in a zigzag way, with the large and small diameter ends of the upper taper rollers being disposed on opposite sides of the large and small diameter ends of the lower taper rollers.
According to another aspect of the present invention, there is provided a plate working system, comprising: a roller leveller for a plate comprising: a plurality of upper taper rollers each having a large diameter end and a small diameter end with a collar, the large diameter ends being set at a same side, the small diameter ends being set on other side, and lower generating lines being disposed in parallel to a horizontal plane; and a plurality of lower taper rollers each having a large diameter end and a small diameter end with a collar, the large diameter ends being set on a same side, the small diameter ends being set on other side, upper generating lines being disposed in parallel to a horizontal plane, the upper taper rollers and the lower taper rollers being disposed in a zigzag way, with the large and small diameter ends of the upper taper rollers being disposed oppositely to the large and small diameter ends of the lower taper rollers; and a working facility disposed at an output port of the roller leveller.
According to another aspect of the present invention, there is provided a roller leveller for correcting a camber of a plate, comprising: a plurality of upper taper rollers each having a large diameter end and a small diameter end, the large diameter ends being set on a same side and the small diameter ends being set on other side to define a first plate opposing plane; a plurality of lower taper rollers each having a large diameter end and a small diameter end, the large diameter ends being set on a same side and the small diameter ends being set on other side to define a second plate opposing plane, the upper taper rollers and the lower taper rollers being disposed in a zigzag way, with the large and small diameter ends of the upper taper rollers being disposed oppositely to the large and small diameter ends of the lower taper rollers; and a position regulating mechanism for regulating a lateral position of the plate between the first and second plate opposing planes.
REFERENCES:
patent: 790706 (1905-05-01), Simmers
patent: 2279038 (1942-04-01), Gifford
patent: 4022046 (1977-05-01), Serizawa
patent: 4334418 (1982-06-01), Grandell
patent: 653251 (1937-11-01), None
patent: 2721617 (1977-12-01), None
patent: 37223 (1985-02-01), None
patent: SU 412 960 (1974-01-01), None
Supplementary European Search Report, Appln. No. EP 99 92 9895, dated Apr. 4, 2001, 3 pages.
Arent Fox Kintner & Plotkin & Kahn, PLLC
Crane Daniel C.
Kuraitekku Co., Ltd.
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