Laser hardening of screw forms

Details Laser hardening of screw forms Laser hardening of screw forms

1997-07-28

2000-01-11

Sheehan, John

Metal treatment

Stock

Ferrous

148902, 415 71, 415 72, 415 73, 415 75, 415120, 415143, C22C 3800

Patent

active

060131403

ABSTRACT:
A harden screw form and methods of making same for use with, for example, positive displacement rotary axial screw pumps are disclosed. The methods include the use of a CNC machine with a laser and a special, newly developed optic for selectively hardening the contact areas of screw forms, such as for example, rotors used in positive displacement rotary axial screw pumps such that the rotor undergoes only controllable or predictable distortion as a result of the hardening process. Hardened screw forms manufactured by the CNC/laser/optic process that are free of uncontrollable or unpredictable distortion are also disclosed.

REFERENCES:
patent: 3693842 (1972-09-01), Cozzarin et al.
patent: 4502273 (1985-03-01), Miyamoto et al.
patent: 5131957 (1992-07-01), Epstein et al.
patent: 5330587 (1994-07-01), Gavigan et al.
patent: 5601414 (1997-02-01), DiRe
patent: 5719376 (1998-02-01), Snyder et al.
Weber, Tim,Hardening of Steel With a High Power CW Nd:YAG Laser, Proceedings of ICALCO '92 Laser Materials Processing, Oct. 25-29, 1992, Orlando Florida, 1993, pp. 3201-3208.

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