Method and apparatus for induction heating of gear teeth

Details Method and apparatus for induction heating of gear teeth Method and apparatus for induction heating of gear teeth

1989-03-02

1990-01-16

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1059, 219 1075, 266125, 266129, 148147, H05B 614

Patent

active

048945013

ABSTRACT:
A method and apparatus for induction heating and quench hardening of an undulating cylindrical surface, such as that defined by gear or sprocket teeth, provide a hardness pattern uniformly distributed to a controlled depth across and between the teeth surfaces by means of axial scanning of the workpiece relative to a single induction heating coil. A distinct final heating scanning process follows a preheating scanning process whereby preheating and final heating can be conducted at differing controlled axial velocities. Axial scanning of the workpiece repeatedly past a single inductor coil enables preheating and final heating of workpieces which cannot be axially shifted directly between separate inductor coils, such as internal planetary ring gears having a closed end or external gears having a flange or shoulder protruding radially from the cylindrical gear teeth surface.

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