Method of broaching outer periphery of lobe-type rotor of roots-type fluid machine, and broaching cutter used in the method
US4693813A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1986 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Jul 30, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T409/505084
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.