Vacuum heat treatment method and apparatus
A technology of vacuum heat treatment and vacuum heat treatment furnace, which is applied in the direction of solid-state diffusion coating, coating, metal material coating process, etc., can solve the problem of not being able to obtain carburizing quality with good reproducibility, and achieve good reproducibility and easy operation , the effect of flexible adaptation
Inactive Publication Date: 2006-12-20
KOYO THERMO SYST CO LTD
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Problems solved by technology
[0006] However, in this method, the material of the processed workpiece and the required carburizing quality cannot be accurately and reproducibly obtained at present.
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[0038] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0039] figure 1 Briefly represent the overall structure of the vacuum heat treatment device of the present invention, figure 2 The structure of the control part of this vacuum heat treatment apparatus is shown.
[0040] exist figure 1 Among them, the vacuum heat treatment unit is equipped with:
[0041] A vacuum heat treatment furnace (1); a heating device (2) arranged in the vacuum heat treatment (1); a vacuum pump (4) connected to the vacuum heat treatment furnace (1) through a vacuum exhaust pipe (3) divided into two branches in the middle ); the pressure control valve (5A) in the furnace that is located on a branch of the vacuum exhaust pipe (3); the vacuum switch valve (5B) that is located on another branch of the vacuum exhaust pipe (3); Pipelines (6), (7), (8) connected to the vacuum heat treatment furnace (1) hydrogen high-pressure gas storage cylinder (9), e...
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A method for a vacuum heat treatment such as carburizing carbo-nitriding high temperature carburizing or high concentration carburizing; wherein the treatment is carried out with the supply of a mixed gas of an ethylene gas and a hydrogen gas which comprises measuring the amounts of an ethylene gas and a hydrogen gas in a vacuum heat treatment furnace calculating a carbon potential of the atmosphere in the furnace based on the measured amounts comparing the calculated value to the objective value predetermined based on the quality of the material of an article to be treated and the requirements for the performance of a heat-treated product and controlling the amounts of an ethylene gas and a hydrogen gas supplied to the vacuum heat treatment furnace based on the difference between the calculated value to the objective value. The method allows the production of a heat-treated product having the quality required with improved accuracy and improved reproducibility.
Description
technical field [0001] The present invention relates to a vacuum heat treatment method and a device for carrying out the method. The method is to supply a mixed gas of ethylene gas and hydrogen gas under reduced pressure while performing carburizing, carbonitriding, high-temperature carburizing, high-concentration Carburizing etc. Background technique [0002] As a vacuum carburizing method for carburizing steel automobile parts such as gears, bearings, fuel nozzles, constant velocity joints, etc., it is known to use ethylene gas as the carburizing gas and reduce the pressure in the vacuum heat treatment furnace to 1-10kPa A method of carburizing (see Japanese Patent Application Laid-Open No. 11-315363). [0003] However, in the conventional method, when vacuum carburizing is carried out by placing a basket loaded with many processed workpieces in an effective heating space that can ensure temperature uniformity in a vacuum heat treatment furnace, due to the position of loa...
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IPC IPC(8): C23C8/22C23C8/32C23C8/20C23C8/30
CPCC23C8/30C23C8/20C23C8/22C23C8/32
Inventor 山口和嘉田中康规
Owner KOYO THERMO SYST CO LTD