Electric heating – Inductive heating – Specific heating application
Patent
1993-02-08
1994-11-01
Leung, Philip H.
Electric heating
Inductive heating
Specific heating application
219652, 219672, 148573, 266129, H05B 640, H05B 614
Patent
active
053609638
ABSTRACT:
An induction-hardening machine for the contour hardening of cross-axis, intersecting-axis and nonintersecting-axis gears such as hypoid gears includes a programmable logic control unit, a source of quench liquid and a high-frequency induction generator which are operably connected to a high-frequency induction coil which, in one embodiment, is disposed at an inclined angle above the horizontally disposed workpiece (hypoid gear). Fluid connections are made between the source of quench liquid and the induction coil for the rapid delivery of quench liquid. The support platform for the hypoid gear is connected to a rotary drive motor and with the hypoid gear rotating at approximately 900 to 1800 RPM the induction coil is energized with four low energy pulses of relatively short duration. The final heating step is a high energy pulse followed immediately by the quenching step. In one embodiment the induction coil is also offset from the geometric center of the gear and it is this offset and the inclined angle of the induction coil which address the heel to toe tooth differences and the spiral configuration of a hypoid gear.
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Induction Gear Hardening by the Dual Frequency Method, Heat Treating magazine, vol. 19, No. 6, Jun. 1987.
Chaplin Michael R.
Storm John M.
Contour Hardening, Inc.
Leung Philip H.
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