Abstract:
A circular-shaped metal structure is fabricated by plastic-working and has a wall thickness in the range of 0.03 mm to 0.09 mm both inclusive. A film composed of one of (a) silicon and fluorocarbon resin and (b) copper is coated on a surface of the circular-shaped metal structure.
Abstract:
The invention provides a circumferential length correcting method for a metal ring including: a circumferential length measuring step of passing the metal ring around a driving roller and a driven roller, displacing the driving roller and the driven roller away from each other, and measuring the actual circumferential length of the ring under tension; and a circumferential length correcting step of correcting the circumferential length of the ring by displacing a circumferential length correcting roller by a predetermined distance in a direction in which the metal ring is extended, the method being capable of imparting an appropriate arc shape to the metal ring while correcting the circumferential length to fall within an appropriate value range, and a circumferential length correcting apparatus therefor. Before the circumferential length correcting step, the method includes an arc-shape imparting step of displacing an arc-shape imparting roller 3, which has an arc-shaped circumference and is positioned inside a metal ring W, by a predetermined distance in a direction in which the metal ring W is extended, thereby imparting an arc shape W1 conforming to the shape of the circumference of the arc-shape imparting roller 3 to the metal ring W.
Abstract:
A manufacturing method of an endless metal belt having metal rings built up and differing in circumference, includes the following steps of: a first circumference correction step of expanding each of the metal rings; and a second circumference correction step of expanding each of the metal rings after conducting a solution heat treatment to the expanded metal ring. In the manufacturing method, by executing the first circumference correction step and the second circumference correction step before and after the solution heat treatment, respectively, an expansion quantity for setting a circumference of each of the metal rings to become a predetermined length is attained.
Abstract:
A circular-shaped metal structure formed by spinning working has a thickness equal to or smaller than 0.09 mm. The structure may be used as a photosensitive drum or fixing belt in an electrophotographic printer.
Abstract:
Notched areas are provided on the outer periphery of a flat plate in the coining process to allow material of said plate flow more easily toward the periphery during the coining process. Use of flat plate provides a more economical way of making elements with accurate size and dimensions for continuously variable transmission belt.
Abstract:
A cylindrical drum is prepared by welding opposite ends of a thin sheet of maraging steel. A first solution treatment is effected on the cylindrical drum, and then the cylindrical drum is severed into a plurality of rings each having a predetermined width. After the rings are rolled, a second solution treatment is effected on the rings which have been rolled, and then the circumferential length of each of the rings is corrected. The rings are aged and nitrided, and then stacked into a laminated ring. The first solution treatment and the second solution treatment are effected using the same heating furnace in the same atmosphere in the same temperature range.
Abstract:
A method of fabricating a circular-shaped metal structure, includes the steps of (a) rotating a pipe around an axis thereof, the pipe being composed of a plastic-workable metal, and (b) applying drawing to an outer wall of the pipe with the pipe being kept rotated, to reduce a wall thickness of the pipe and lengthen a wall of the pipe. A resultant circular-shaped metal structure fabricated by the method could have a thickness equal to or smaller than 0.09 mm.
Abstract:
A method of manufacturing an endless metallic belt of high strength for use as a drive belt or a part of a drive belt. A stress gradient is introduced in the belt in the radial direction thereof by bending the belt at such a radius as to produce plastic deformation of the metal. The belt is first subjected to tensile stress, which stress is maintained during the bending process.
Abstract:
A method and apparatus for installing endless steel belts or steel bands of improved characteristics on machines of the type having a large roll and an endless steel belt extending around the roll and held under tension against the roll surface as the roll is turned. This type of equipment is used for producing a continuous sheet of a product by feeding a layer of the feed products in between the belt and the roll to thereby compress the products while subjecting them to a heat treatment. The belts must be replaced from time to time and must be repaired upon occasion, and the present invention permits such replacement and repair with belts having very high tensile strength.