Draw punch having relieved helical working faces

Details Draw punch having relieved helical working faces Draw punch having relieved helical working faces

1995-03-27

1998-03-17

Dexter, Clark F.

Cutting

Tool or tool with support

Cutting couple type

83689, 30360, 30361, B26F 114

Patent

active

057274363

ABSTRACT:
A draw punch of the type used for cutting holes in various materials such as sheet metal has a cylindrical body with a central bore through it and a cutting edge at the outside diameter of the body. A working face is defined at one end of the body between the cutting edge and the bore. The working face includes two diametral axial faces which extend from a root to a peak. The working face further includes two valleys located between the peak of one axial face and the root of the other axial face. Primary helical surfaces extend from a peak to a valley while secondary helical surfaces extend from the valley to the root. The helical surfaces are everywhere relieved in a radial direction from a plane normal to the axis of the body and intersecting any point on the cutting edge.

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