Back to results
US 4,362,078 AGranted
Method of blanking
AssigneeAkzona Incorporated
InventorsTatsuo Ohnishi, Takeshi Uemura, Teruo Nakajima
Life of this patent
Estimating the term…
Abstract
A method of blanking wherein an endless V-shaped groove of desired contour is formed on at least one of the top and bottom sides of a material sheet. The groove is shaped so that the external side thereof is at a right angle to the groove-cut surface of the sheet. A blank having the desired contour is then cut out of the sheet along the right-angled external side of the groove.
Claims6
A method of blanking, comprising the steps of:
- providing a lancing punch having an endless lancing edge projecting outwardly from one end thereof, which lancing edge is of a generally V-shaped cross section with the exterior side of the V-shaped lancing edge extending perpendicular to the material sheet which is to be punched;
- moving said lancing punch into engagement with a surface of said material sheet for causing the lancing edge to penetrate said surface and form an endless groove in said sheet, which groove projects into said sheet from said surface and has a V-shaped cross section, with the outer peripheral edge of said groove extending at right angles to said surface;
- positioning said material sheet on a support having a knockout opening therein corresponding to the profile of the proposed blank as defined by said endless groove so that said proposed blank is aligned with and positioned over said knockout opening;
- providing a blanking punch having an endless blanking edge projecting from one end thereof, which blanking edge corresponds to and is adapted to occupy said endless groove;
- moving said blanking punch into engagement with said material sheet so that the blanking edge occupies said groove;
- and then movin said blanking punch towards the material sheet for cutting the blank from the material sheet and moving same into said knockout opening.
3 more elements
Dependencies are inferred from the claim text.