Gas cooling type vacuum heat treating furnace and cooling gas direction switching device

Abstract

The present invention provides a gas cooling type vacuum heat treating furnace, comprising a gas cooling furnace having a cooling chamber allowing the stationary placement of a treated article therein and forming a gas flow passage in the vertical direction, a gas cooling / circulating device circulatingly cooling gas flowing in the cooling chamber, a gas direction switching device alternately switching the direction of the gas vertically passing the inside of the cooling chamber, and upper and lower straighteners closing the upper and lower ends of the cooling chamber to uniformize the velocity distribution of the gas passing the cooling chamber.

Description

Technical field [0001] The invention relates to a gas cooling type vacuum heat treatment furnace and its cooling gas reversing device. Background technique [0002] A vacuum heat treatment furnace is a heat treatment furnace that depressurizes the inside and then fills it with inert gas to heat treat the processed product. The vacuum heat treatment furnace has the advantage that during heat treatment, the moisture attached to the furnace and the processed product is vaporized by heating, and then the pressure is reduced again and filled with inert gas, etc., so that the moisture can be completely removed. To eliminate the color caused by moisture, this heat treatment (called bright heat treatment). [0003] In addition, the gas-cooled vacuum heat treatment furnace also has a series of advantages, such as bright heat treatment without decarburization and carburization, less deformation, and good working environment. However, the early gas-cooled vacuum heat treatment furnace had s...

AI Technical Summary

Problems solved by technology

[0011] (1) At the end of heating, the temperature of the heating heater and the furnace body will become very high, and at the time of cooling, the temperature of the heater and the furnace body will be cooled at the same time, so the heat treatment material cannot be cooled at a high speed

[0012] (2) There are heaters and furnaces for heating around the heat treatment material, so the cooling gas cannot be uniformly supplied during cooling

[0013] (3) Even if gas cooling is carried out alternately in the up and down direction, there is no device to rectify the upward and downward cooling gas into a uniform speed and flow direction, so it is difficult to reduce the stress of the entire heat treatment material

[0015] (4) Due to the switch position of the regulating device, under the action of wind pressure passing through at high speed, its load changes greatly

Therefore, it is difficult to adjust the balance of the opening area when switching between the upper and lower drive units, and the opening area of ​​the suction port and the discharge port will be different, or its variation will be large, and the amount of cold air will fluctuate, making it difficult to perform stable air cooling.

[0017] (6) Due to the existence of multiple adjustment devices, multiple driving devices are required, resulting in a complicated structure

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