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High pressure gas quenching cooling method of aerosol forced circulation

A technology of high-pressure gas and forced circulation, applied in the direction of quenching agent, quenching device, manufacturing tools, etc., can solve the problems of insufficient cooling capacity of high-pressure gas, uneven cooling of spray quenching, etc., to overcome insufficient cooling capacity, uneven cooling, The effect of improving the cooling capacity

Inactive Publication Date: 2006-02-08
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention utilizes the characteristics of spray quenching with high cooling strength and high-pressure gas quenching to achieve uniform cooling under the action of a forced circulation fan, mixes water mist and high-pressure gas into an aerosol mixture, and is driven by a strong stirring fan The gas-mist mixture realizes rapid and uniform movement in the container, which overcomes the shortcomings of uneven spray quenching and insufficient cooling capacity of high-pressure air, and achieves the purpose of rapid and uniform quenching and cooling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First, the tool steel heated to the quenching temperature in the heating furnace is transferred to a container equipped with a powerful stirring fan, a heat exchanger, and gas and water mist nozzles, then the powerful stirring fan is turned on, and nitrogen and water are injected into the container at the same time Fog, nitrogen and water mist form a gas-liquid mixture driven by a powerful stirring fan, and the gas-liquid mixture exchanges heat with the hot workpiece under the drive of a powerful stirring fan, and the gas pressure in the container is adjusted to 5×10 5 Pa, the pressure of spraying water mist is 5×10 5 Pa and its water content are 50%, and the rotation speed of the powerful stirring fan is 1500rpm, so as to adjust the cooling intensity to achieve the cooling capacity between water and still air. The heat absorbed by the gas-liquid mixture from the workpiece passes through the heat exchange set in it. Take it away with the device or discharge the containe...

Embodiment 2

[0012] First, the tool steel heated to the quenching temperature in the heating furnace is transferred to a container equipped with a powerful stirring fan, a heat exchanger, and gas and water mist nozzles, then the powerful stirring fan is turned on, and helium and spray are injected into the container at the same time. Into water mist, helium and water mist form a gas-liquid mixture driven by a powerful stirring fan, and the gas-liquid mixture exchanges heat with the hot workpiece under the drive of a powerful stirring fan, and the gas pressure in the container is adjusted to 2×10 5 Pa, the pressure of spraying water mist is 5×10 6 Pa and its water content are 100%, and the rotation speed of the powerful stirring fan is 2800rpm, so as to adjust the cooling intensity to achieve the cooling capacity between water and still air. The heat absorbed by the gas-liquid mixture from the workpiece passes through the heat exchange set in it. Take it away with the device or discharge th...

Embodiment 3

[0014] First, the tool steel heated to the quenching temperature in the heating furnace is transferred to a container equipped with a powerful stirring fan, a heat exchanger, and gas and water mist nozzles, and then the powerful stirring fan is turned on, and at the same time, air and water are injected into the container Fog, air and water mist are driven by a powerful stirring fan to form a gas-liquid mixture, and the gas-liquid mixture is driven by a strong stirring fan to exchange heat with the hot workpiece, and the gas pressure in the container is adjusted to 10 3 Pa, the pressure of spraying water mist is 5×10 4 Pa and its water content are 10%, and the rotation speed of the strong stirring fan is 500rpm, so as to adjust the cooling intensity to achieve the cooling capacity between water and still air. The heat absorbed by the gas-liquid mixture from the workpiece passes through the heat exchange set in it. Take it away with the device or discharge the container through...

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Abstract

The present invention belongs to the field of heat treatment of metal material. Gas and water fog is led into a container with forced stirring blower and heat exchanger for heat exchange with the hot workpiece, and the heat the gas and water fog absorb from the workpiece is taken away by the forced stirring blower and the heat exchanger to reach the aim of quickly cooling the quenched workpiece. The combination of gas and water fog can raise the heat exchange coefficient between the medium and the workpiece obviously and cooling capacity and the cooling capacity may be adjusted in certain range.

Description

technical field [0001] The invention relates to a quenching and cooling method, in particular to a gas mist forced circulation high-pressure gas quenching and cooling method suitable for heating workpieces under vacuum or protective atmosphere, and belongs to the field of metal heat treatment. Background technique [0002] Conventional, special and combined cooling methods and equipment are usually used in order to obtain a predetermined structure and performance. High pressure gas quenching and spray quenching are two different quenching cooling methods that have been used. High-pressure gas quenching uses neutral or inert gases such as nitrogen and helium as the medium, and passes them into a heating furnace or a specific container at a certain pressure (2 to 20 bar or higher), and the gas is forced to convect under the drive of a high-power fan. The heat exchange between the gas and the workpiece is realized, and the heat absorbed by the gas from the workpiece is taken a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/613C21D1/62
Inventor 潘健生陈乃录张伟民胡明娟刘占仓
Owner SHANGHAI JIAOTONG UNIV
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