Thread cutting machine and thread cutting method

Details Thread cutting machine and thread cutting method Thread cutting machine and thread cutting method

1995-11-17

1998-03-31

Larson, Lowell A.

Threaded, headed fastener, or washer making: process and apparat

Apparatus for making internally threaded fastener, i.e., nut

Having tapper

470 18, 470 44, 470181, 470198, B21D 5324

Patent

active

057331987

ABSTRACT:
Axial loads encountered during thread cutting are reduced by controlling interactions between rotation speed, axial feeding speed, feeding (threading) pitch, and feeding position. A counterload is generated by changing a feeding pitch to a corrected feeding pitch, which changes the rotation speed, while keeping the feeding speed constant; by changing the feeding speed, while compensating the rotation speed (which is derived from the feeding speed) to remain constant; by changing the rotation speed, while compensating the rotation speed deviation feedback (to allow the deviation correction to follow the rotation speed change), while keeping the feeding speed constant; by generating a function according to empirical results that controls the feeding pitch, and therefore the rotation speed, while keeping the feeding speed constant; and by combinations of these methods.

REFERENCES:
patent: 4745557 (1988-05-01), Pekar et al.
patent: 4780654 (1988-10-01), Shoji et al.
patent: 4813821 (1989-03-01), Hirota
patent: 4879660 (1989-11-01), Asakura et al.
patent: 4911588 (1990-03-01), Ikemota et al.
patent: 4985841 (1991-01-01), Iwagaya
patent: 5062744 (1991-11-01), Nakamura et al.
patent: 5316520 (1994-05-01), Green
patent: 5352069 (1994-10-01), Rourke
JP Provisional Publication No. SHO 60-155319 Published on Aug. 15, 1985. * English Abstract*.
JP Provisional Publication No. SHO 63-251121 Published on Oct. 18, 1988.
JP Provisional Publication No. SHO 64-58425 Published on Mar. 6, 1989.

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