| 摘要 |
PURPOSE:To uniformly and rapidly execute cooling and quenching of a material to be treated, to eliminate uneven hardness on the material to be treated and to prevent lowering of the product yield caused by improper heat treatment by spirally arranging gas blowing hole for cooling on peripheral face of a cylindrical chamber charging the material to be treated in a vacuum heat treating furnace. CONSTITUTION:The chamber is set in the furnace body 3 of the vacuum heat treating furnace 1 through a chamber receiving table 4, and a work 6 to be heat-treated is charged into the chamber and heated by a heater 8 under vacuum condition. The heated work 6 is rapidly cooled by blowing the inert gas of Ar, etc., as coolant into the chamber 5 and treated for the quenching, to execute the heat-treatment of surface hardening, etc. In this case, by spirally arranging the inert gas blowing hole 22 as the coolant on the outer periphery of the chamber 5, as the cooling gas does not mutually collide and interfere in the chamber 5, the cooling is uniformly and effectively executed, and the heat-treated product without any uneven hardness can be obtd.
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