Korea Sintered Metal Co., Ltd.

Young Su Jeon

Jong Kwan Park

A high frequency heat treatment method for a fine bottom-closed hole includes preparing a coil so as to be completely inserted into the fine bottom-closed hole, preparing a core for controlling a magnetic flux within the coil such that the core protrudes from upper and lower sides of the coil, heat-treating a target part of the fine bottom-closed hole under conditions of a heating time of 2&#x2dc;3 seconds, an output power of 200&#x2dc;300 kW, a quenching time of 3&#x2dc;5 seconds, a positive electrode voltage of 4 &#x2dc;8 kV, and a positive electrode current of 2.0&#x2dc;4.5 A, and quenching the heat-treated part of the fine bottom-closed hole with cooling nozzles fixed around the heat-treated part such that a sufficient amount of cooling water is injected uniformly over the whole heated part with a sufficient pressure via the cooling nozzles.

Growing community of inventors

Daegu, South Korea

Young Su Jeon