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1. 发明专利

JPH01252723A METHOD FOR PREVENTING OXIDATION OF ATMOSPHERE 失效
公开(公告)号：JPH01252723A
公开(公告)日：1989-10-09
申请号：JP7965788
申请日：1988-03-31
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , ABUKAWA FUMITAKA , GOI HITOSHI , FUJITA KAZUYOSHI , KITAMOTO KENICHI , KONAGAYA HIROYUKI
IPC分类号： C21D1/76
摘要： PURPOSE:To prevent the flowing of an oxidizing atmosphere into a heating chamber and further to prevent the turbulence of the atmosphere in the heating chamber by sucking raw gas and air into the heating chamber when evacuated, and thermally decomposing the gaseous mixture to form a reducing gas in the heating chamber. CONSTITUTION:Solenoid valves 14 and 15 are opened along with the movement of a high-temp. work to introduce a mixture contg. an appropriate ratio of the raw gas such as propane and air (oxygen) into ring burners 11 and 13 when the heating chamber H is evacuated. In this case, the opening degree of the valves 14 and 15 is controlled so that a small amt. of air is left after the combustion in the burner 11. The gas is ignited in the burner 13, but incompletely burned due air deficiency at the combustion port 12. Concretely, the combustion is adjusted based on the flame lengths of the burners 11 and 13. A solenoid 7 is then energized, and a stop valve 2 is opened to introduce the external air freed of oxygen into the heating chamber H. Since the chamber H is held at high temp., the sucked raw gas and air are thermally decomposed to form a reducing gas, and the oxidation is prevented. The vacuum in a furnace is simultaneously turned off, and hence the turbulence of the atmosphere in the chamber H can be prevented.

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