Non-circular slug splitter punch
AssigneeGreenlee Textron Inc.
InventorLarry Adleman
Life of this patent
Estimating the term…
Abstract
The punch comprises peripheral cutting edges and lateral cutting edges. The peripheral edges cut a slug in the desired shape, for examples, rectangular, square, oval, trapezoidal, D and double D-shaped, etc. while the lateral edges cut transversely from one peripheral edge to an opposite peripheral edge, thereby splitting the slug. Lateral cutting edges provide a dividing line across the working face. Surfaces and cutting edges on each side of the dividing line are similar and canted at opposite angles. Lateral cutting edges and peripheral cutting edges at their juncture provide pyramidal cutting sections which initially pierce the workpiece and initiate lateral slug splitting. This split grows from the slug periphery toward the center. Splitting is complete before a substantial portion of the slug periphery is cut.
Claims19
A punch for use with a die producing a slug in at least two pieces when forming a non-round opening in a workpiece positioned between said punch and die, said non-round opening and said at least two-piece slug being cut by movement of said punch and die toward each other in a direction along a Z axis, said punch having a working face which when viewed along said Z axis corresponds in shape with said opening, said working face being definable as having an X axis and a Y axis perpendicular to said plane, said X and Y axes extending respectively from the peripheral edge at one side of said face to the peripheral edge at the opposite side of said face, said X axis defining a dividing line for said working face as viewed in the direction of the Z axis, said working face comprising:
- a pair of first inclined surfaces disposed on opposite sides of said dividing line and sloping in opposite directions at an angle .alpha. relative to said X-Y plane as viewed in the X-Z plane and in the direction of the Y axis, said first surfaces being at a non-zero angle .beta. relative to said X-Y plane when viewed in the Y-Z plane and in the direction of the X axis, said first surfaces each having an outer periphery forming a first outer cutting edge on opposite sides of said dividing line;
- a pair of second inclined surfaces each joining with a respective one of said first inclined surfaces, said second surfaces being inclined at said angle .alpha. relative to said X-Y plane as viewed in the X-Z plane and in the direction of the Y axis, said second inclined surfaces being inclined at a non-zero angle .theta. relative to said X-Y plane when viewed in the Y-Z plane and in the direction of the X axis, said second inclined surfaces each having an outer periphery forming a second cutting edge contiguous with the respective first cutting edges on opposite sides of said dividing line;
- a pair of lateral cutting edges extending along said X axis inwardly from opposite ones of said peripheral edges, said second inclined surfaces each terminating at a respective one of said lateral cutting edges;
- and
- third surfaces associated with each said lateral cutting edge and connecting respectively between said cutting edges and said second inclined surfaces.
Dependencies are inferred from the claim text.