Two-stage broaching of engine block bearings

Gear cutting – milling – or planing – Broaching – Process

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407 18, 409265, 409299, B23D 3722

Patent

active

054356768

ABSTRACT:
A method and apparatus for broaching a series of axially aligned and spaced bores in which a first broach is provided for broaching in an initial operation. The first broach has circumferentially extending cutting teeth. The first broach also has arcuately spaced, longitudinally extending grooves which cross the cutting teeth and divide the cutting teeth into arcuate segments. Broach guides in the spaces between bores have ribs arranged in the same arcuately spaced relation as the grooves about an axis coinciding with the aligned axes of the bores. The first broach is advanced through the bores with the ribs slidably received in the grooves to guide the first broach and the cutting segments, broaching arcuately spaced sectors of the bores but leaving unbroached ridges therebetween. A second broach broaches the ridges left by the first broach.

REFERENCES:
patent: 1197132 (1916-09-01), Lapointe
patent: 1318537 (1919-10-01), Bunting
patent: 2215616 (1940-09-01), Lapointe et al.
patent: 2292900 (1942-08-01), Schmidt
patent: 2314160 (1943-03-01), Phaneuf
patent: 2487757 (1949-11-01), Iversen
patent: 2644369 (1953-07-01), Praeg
patent: 3178800 (1965-04-01), Psenka
patent: 4498361 (1985-02-01), Grace
patent: 5224804 (1993-07-01), Shepley

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