| 摘要 |
A method and apparatus for hardening a small internal passage in a workpiece wherein the workpiece is indexed into coaxial alignment between axially spaced inductor coils and an actuator telescopically inserts a magnetically permeable flux concentrating rod through the passage, and coextensive with the coils and in inductive relationship with the interior surface, such that upon energization of the coils, flux is concentrated in the concentrating rod and effectively inductively delivered to the surface to raise the temperature thereof to a heat treating temperature, the actuator being extended to another position wherein a quenching ring is disposed adjacent to the surface for delivering coolant thereto to quench harden the surface, the actuator being finally retracted to allow sequential indexing of workpieces.
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