| 摘要 |
<p>PURPOSE:To facilitate the charge/discharge of a work into/from a hardening apparatus and to miniaturize the whole hardening apparatus by concentrically arranging a heating coil and a jacket for water cooling with the inner peripheral surface of the work and vertically moving along the axis, in the quenching apparatus for the inner peripheral surface of the annular work. CONSTITUTION:A tooth W1 on the inner peripheral surface of an inner face ring gear W is heated to the hardening temp. with a heating coil 10 by the high-frequency current from a transformer 90, and the cooling liquid L from an inlet 43a is injected to the tooth W1 from the injection holes 31 of the jacket 33. The heating coil 10 and the jacket 30 for water cooling are concentrically arranged with the inner surface of the work W, and the work W is fitted to a supporting member 81 vertically movable by operation of a cylinder 58 and a rod 59. At first, the work W is ascended to a heating device P1 and the electric current is conducted to the coil 10 to heat the inner face tooth W1. Successively, the work W is descended to a cooling position P2 with a supporting member 81, and after hardening the inner face tooth W1 by injecting the cooling water L to the inner surface of the work W from the injection hole 31 of the water cooling jacket 30, the work W is ascended to the position P1 and taken out of the supporting member 81.</p> |
