Camshaft lobe hardening method and apparatus

Details Camshaft lobe hardening method and apparatus Camshaft lobe hardening method and apparatus

1986-03-24

1988-01-19

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

266127, 266129, C21D 110

Patent

active

047203110

ABSTRACT:
A method and apparatus for making camshafts of steel by hardening the lobes after they have been rough and finish machined and the final contour and finish of the cam surface formed on each lobe while the steel is soft. Each lobe with the finished cam surface thereon is disposed in an induction coil to which an alternating current is applied for not more than about five seconds to rapidly heat the peripheral portion of the lobe which is then quenched by spraying an aqueous liquid on the lobe preferably while still in the coil. This heating and quenching hardens the peripheral portion of the lobe by a martensite transformation thereof without any significant warping or distortion of the cam surface. To prevent a previously hardened lobe from being annealed by induction heating of an immediately adjacent lobe, preferably a cooling or quenching liquid is also sprayed on the camshaft between these lobes and immediately adjacent the heated lobe.

REFERENCES:
patent: 4604510 (1986-08-01), Laughlin et al.

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