Method of broaching outer periphery of lobe-type rotor of roots-

Gear cutting – milling – or planing – Broaching – Process

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29 235, 291568CF, 407 19, 409268, 409293, 409310, 409319, B23D 1502

Patent

active

046938133

ABSTRACT:
A broaching method for finishing an outer peripheral surface of a resin layer of a resin-coated lobe-type rotor for a rotary fluid machine of a Roots type, which includes the steps of forming, with a leading grooving cutter, at least one chip-breaker groove in the outer peripheral surface of the resin layer, such that the chip-breaker groove extends in a broaching direction parallel to an axis of rotation of the rotor. The method further includes the steps of finishing at least a portion of the outer peripheral surface of the resin layer with a trailing finish cutter having a cutting edge contour corresponding to the portion of the outer peripheral surface of the resin layer, which is finished by the finish cutter after the chip-breaker groove is formed therein by the grooving cutter. A composite broach or formed broach having the grooving and finish cutters is fed such that the grooving cutter leads the finish cutter in the broaching direction.

REFERENCES:
patent: 4512066 (1985-04-01), McCullough
patent: 4595349 (1986-06-01), Preston et al.
B. Wiedemann, SAE Technical Paper Series (Development of Volkswagen's Supercharger G-Lader), Feb. 24-28, 1986.

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