Apparatus and method for net shape finishing of gears
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United States of America Patent
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Jun 22, 1993
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N/A
app pub date -
Jan 31, 1992
filing date -
Jan 31, 1992
priority date (Note) -
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Abstract
An apparatus is disclosed for performing thermomechanical processing of gears in which precise control of the thermal, metallurgical and mechanical action during the forming process is maintained. The apparatus comprises an induction heating system which reaustenitizes the surface of the gear with minimum decarburization, a material transfer system which provides timely operations on the work piece, tooling and fixture adjustments which provide accurate initial conditions for forming, and a process control architecture that provides the precise sequence and timing necessary to achieve metallurgically sound and dimensionally accurate gears. Using this invention the induction heating cycle can be controlled from the peak, average or minimum gear surface temperature detected with a high response optical pyrometer. An inert environment is maintained around the workpiece during the induction heating and transfer to quenching above the M.sub.s temperature. Both through-feed and in-feed motion are simultaneously controlled by load, position and velocity transducers which provide feedback information to a supervising microprocessor. This apparatus produces metallurgically sound and accurate gears.
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