Method of producing semicircular washers having a projection to prevent rotation
AssigneeDaido Metal Company Ltd.
InventorYoshio Iijima
Life of this patent
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Abstract
In producing a semicircular washer having a projection to prevent rotation formed thereon, a blank material in the form of a flat bar is forced to pass a roll caliber between upper and lower forming rolls arranged in a pair and bent on and along one of the forming rolls while being pressed in the breadthwise direction to become a semicircular washer. The semicircular washer then has its outer marginal portion punched out by means of a punch and a die to form thereon a projection for preventing rotation. The method ensures an increase in the yield of semicircular washers having a projection for preventing rotation and enables the projection to be formed in any position on the washer as desired.
Claims3
A method for producing semicircular washers having a projection for preventing rotation, comprising the steps of:
- forcing a flat bar blank to pass through a confined or closed roll caliber defined between an upper and lower forming rolls arranged in a pair to form said flat bar blank to be bent on and along one of said forming rolls while being compressed in the breadthwise direction to produce a semicircular washer, wherein said flat bar blank has been prepared to have a width larger than that of said roll caliber;
- and
- punching out the outer marginal portion of said semicircular washer to using shearing tools to form the projection for preventing rotation on said semicircular washer, thereby to provide a semicircular washer having a projection for preventing rotation thereof.
Dependencies are inferred from the claim text.