Method of manufacturing a washer
OwnerWen-Yuan Leeinventor
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a washer includes the steps of: (a) feeding a metal wire into a die having a bearing face and a through hole which opens to the bearing face so as to permit the metal wire in the through hole to protrude out of the bearing face at a predetermined length; (b) punching the protruded metal wire against the bearing face to form a disc with a punching head which includes a core and a shell; (c) punching the disc to form a central hole on the disc by forcing the core out of said shell and into the through hole; and (d) retracting the punching head to allow the disc to separate from the metal wire.
Claims2
A method for manufacturing a washer, comprising the steps of:
- providing a one-piece die having a downstream bearing face, an upstream end and a through hole extending from said downstream bearing face to said upstream end;
- providing a stationary clamp adjacent to said upstream end of said die;
- providing a moving clamp operatively positioned adjacent to said stationary clamp;
- advancing a metal wire by means of said moving clamp through said stationary clamp and said upstream end until a predetermined length of said metal wire protrudes out of said downstream bearing face via said through hole;
- clamping said metal wire by means of said stationary clamp so as to position said metal wire in said die;
- operating a punching head with a core and a shell so as to punch said protruding length of said metal wire against said downstream bearing face in order to form a disc;
- releasing said stationary clamp from the metal wire;
- and
- forming a central hole in said disc by forcing said core out of said shell and into said through hole.
Dependencies are inferred from the claim text.