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Liquid quenching medium rapid cooling process and device for heat treatment

A technology of quenching medium and liquid cooling medium, applied in the field of heat treatment, can solve the problems of waste of water resources, water cooling capacity can not meet the requirements of workpiece quenching efficiency, no recycling, etc., to improve quenching efficiency, omit booster pump, reduce The effect of energy consumption

Pending Publication Date: 2020-11-17
SHANGHAI FULUDI FLUID TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the external quenching liquid cooling method has the following obvious defects: it is difficult to meet the requirements of uniformity of quenching oil cooling, and it is difficult to achieve the requirements of rapid cooling of quenching oil
[0005] In addition, at present, most of the quenching tanks in machining heat treatment are cooled by cooling water jackets or cooling pipes, which are only suitable for small quenching tanks. The cooling water used must be continuously flowing tap water to achieve the purpose of cooling, and there is no recycling. Inevitable waste of water resources; and the cooling capacity of water cannot meet the requirements of workpiece quenching efficiency

Method used

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  • Liquid quenching medium rapid cooling process and device for heat treatment

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Effect test

Embodiment 1

[0045] see figure 1 As shown, the present embodiment provides a quenching medium rapid cooling process for heat treatment, which is mainly used in heat treatment equipment. The effect of the cylinder 14 drops and is immersed in the quenching tank 1 for quenching and cooling. During the continuous quenching process of the workpiece 15, the temperature of the liquid quenching medium in the quenching tank 1 increases, resulting in a decrease in the quenching quality and efficiency of the workpiece 15. Therefore, it is necessary to treat the high temperature The liquid quenching medium is used for real-time cooling to meet the quenching requirements of the workpiece.

[0046] read on figure 1 As shown, this embodiment provides a rapid cooling process of quenching medium for heat treatment. The main technical solution is to make full use of the latent heat of vaporization of low-temperature liquid carbon dioxide or low-temperature liquid nitrogen to exchange heat and cool down the...

Embodiment 2

[0050] see figure 2 As shown, this embodiment provides a method for recovering and reusing the gaseous cooling medium after heat exchange, which is used in the rapid cooling process of the quenching medium for heat treatment described in Example 1, so as to make full use of the cooling effect of liquid carbon dioxide or liquid nitrogen To maximize the utilization of cooling capacity.

[0051] Such as figure 2 As shown, in this example, by CO 2 The liquid inlet is charged into the first storage tank 4 with liquid carbon dioxide in advance, and the filling amount accounts for at least 60% of the volume of the storage tank. High-pressure gas is used as the transmission power, and the high-pressure gas adopts 3.3MPa high-pressure air, and a certain pressure of high-pressure gas is passed into the first storage tank 4, and the liquid cooling medium in the first storage tank 4 is alternately pressed and sent to the quenching Cold evaporator 2. At the same time, the second stor...

Embodiment 3

[0054] see figure 2 As shown, in order to strengthen the cooling and liquefaction speed of gaseous carbon dioxide in the storage tank, this embodiment provides a method for recycling the gaseous cooling medium after heat exchange, so as to make full use of the cooling capacity of liquid carbon dioxide or liquid nitrogen to realize cooling. Maximize capacity utilization.

[0055] The difference from the above-mentioned embodiment 2 is that this embodiment uses high-pressure gas to pump the liquid cooling medium in the first storage tank 4 through the second injection mechanism 7 and spray it into the second storage tank 5, so that the first storage tank The tank 4 is a liquid storage tank, and the second storage tank 5 is used as a gas recovery tank. The gaseous cooling medium received in the second storage tank 5 is cooled and converted into a liquid cooling medium for recycling by using the principle of throttling and expansion.

[0056] In addition, a first injection mecha...

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Abstract

The invention discloses a quenching medium rapid cooling process and device for heat treatment. The rapid cooling process comprises the following steps: providing a quenching tank for controlling thetemperature of a liquid quenching medium; providing a quenching evaporator, wherein the high-temperature liquid quenching medium circulates between the quenching evaporator and the quenching tank; introducing low-temperature liquid carbon dioxide or low-temperature liquid nitrogen into the quenching evaporator as a cooling medium; and using latent heat of vaporization of the low-temperature liquidcarbon dioxide or the low-temperature liquid nitrogen for carrying out heat exchange and cooling on the high-temperature liquid quenching medium in the quenching tank. Carbon dioxide and liquid nitrogen are used as cooling media, latent heat of vaporization of the low-temperature liquid carbon dioxide or the low-temperature liquid nitrogen is fully utilized, the high-temperature liquid quenchingmedium is subjected to heat exchange and cooling, the cooling strength is high, and it is guaranteed that the liquid quenching medium is rapidly cooled; and re-liquefaction cyclic utilization of gaseous carbon dioxide and gaseous nitrogen is realized, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a quenching medium rapid cooling process for heat treatment and a device thereof. Background technique [0002] Quenching is an important heat treatment process in industrial production and a key technology to improve the physical properties of the workpiece. In the general process, the heated workpiece is placed in a special liquid quenching medium to rapidly cool the workpiece to improve certain physical properties (including Rigidity, hardness, wear resistance, fatigue strength and toughness, etc.). During the quenching process, since the quenching liquid will absorb a large amount of heat from the workpiece, the temperature of the quenching liquid will rise sharply after quenching for a certain period of time, which will seriously affect the quenching effect. [0003] In order to solve the problem that the temperature of the quenching liquid will rise sharply, the tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/63F25D3/10
CPCC21D1/63F25D3/10Y02P10/20
Inventor 杨凡顾剑锋李卫平杨景峰
Owner SHANGHAI FULUDI FLUID TECH CO LTD
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