Broach manufacturing method

Details Broach manufacturing method Broach manufacturing method

1983-04-25

1985-02-12

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

51281R, B21K 502

Patent

active

044983611

ABSTRACT:
The broach manufacturing method includes a first turning operation in which the outer diameter of the puller portion, retriever portion and the toothed cutting portion are rough turned to within 0.030-0.050 inch of finished dimension. Also, in the first turning opertion, the cutting teeth are turned to include a gullet radius of finished dimension and an oversized hook angle intersecting therewith. Following a hardening treatment, the cutting teeth are turned to finished dimension in a second turning operation with the exception that the outer diameter and back-off angle of the finishing teeth are turned slightly oversize in the second turning operation followed by grinding to final dimension. The oversized hook angle of the cutting teeth is also nicked off during the second turning operation and blended with the gullet radius turned in the first turning operation. The turning operations are performed on a CNC lathe.

REFERENCES:
patent: 4272927 (1981-06-01), Myers et al.

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