Heating – Processes of heating or heater operation – Treating an article – container – batch or body as a unit
Patent
1982-02-17
1984-02-07
Camby, J.
Heating
Processes of heating or heater operation
Treating an article, container, batch or body as a unit
266250, 266252, 373112, 373115, 432 18, 432205, C21D 174, C21D 106, F27D 300, F27B 504
Patent
active
044300557
ABSTRACT:
A semi-continuous vacuum heat-treating furnace of two-chambers and one-door type is composed of a vacuum heating chamber which includes a heating element and a heat insulation material, both being stable in chemical property and strength in vacuum condition and atmospheric pressure at high temperature, a cooling chamber which is associated with the vacuum heating chamber, and an intermediate vacuum door which separates the vacuum heating chamber and the cooling chamber from each other. Operation process of the heat-treating furnace comprises steps of entering a first substance to the vacuum heating chamber in atmospheric pressure and heating it at vacuum condition, transferring the heated first substance to the cooling chamber and cooling it under pressure, entering a second substance to the vacuum heating chamber simultaneously with the cooling step of the first substance and then heating the second substance at vacuum condition, and discharging the first substance within the cooling chamber out of the furnace.
REFERENCES:
patent: 3866891 (1975-02-01), Kalbfleisch
patent: 4118016 (1978-10-01), Westeren et al.
patent: 4336412 (1982-06-01), Thomander et al.
"Vacuum Goes High-Production", Jerry Mayfield, American Machinist, Oct.1978.
"Metals Handbook Ninth Edition", vol. 4, Heat Treating.
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