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Deep cooling treatment technology for copper pipe manufacturing die

A cryogenic treatment and mold technology, used in heat treatment furnaces, manufacturing tools, heat treatment equipment, etc., can solve problems such as poor wear resistance, and achieve the effects of enhanced reliability, improved service life and simple operation.

Inactive Publication Date: 2019-03-26
CHONGQING LONGYU PRECISION COPPER TUBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to solve the problem that the wear resistance of the core mold used in the process of making high-precision copper pipes is relatively poor, and introduce a method that can improve the wear resistance of the core mold. revolutionary cryogenic treatment process

Method used

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  • Deep cooling treatment technology for copper pipe manufacturing die
  • Deep cooling treatment technology for copper pipe manufacturing die
  • Deep cooling treatment technology for copper pipe manufacturing die

Examples

Experimental program
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Effect test

Embodiment 1

[0031] like Figure 1-Figure 3 Shown, among the present invention, a kind of cryogenic treatment process that is used for copper tube making mould, is characterized in that, comprises the steps:

[0032] 1) Driven by the intelligent controller, the machined copper tube mold is placed on the fixture, and the copper tube mold is driven by the fixture to put the copper tube mold into the liquid nitrogen cryogenic tank;

[0033] 2) The temperature in the liquid nitrogen cryogenic tank is kept at -155°C~-170°C, and the copper tube mold is kept in the cryogenic tank for 2.5~4 hours;

[0034] 3) After taking out the copper tube mold, immerse it in warm water at 20°C~30°C to quickly return to temperature. The temperature return rate during soaking is 185°C~210°C / s, and the cryogenically treated copper tube mold is obtained.

[0035]The low-temperature tank includes a steel wall 1, expanded perlite 5, an ultra-low temperature linear sensor 12, and a vacuum valve 16. The inner side of ...

Embodiment 2

[0038] The difference between this embodiment and embodiment 1 is:

[0039] In the present invention, the copper pipe mold is controlled by gradual temperature changes in the low temperature tank, and the temperature in the low temperature tank changes in three stages. First, the low temperature tank maintains a temperature of -155°C~-160°C, and the holding time is 1~2.5 hours; then The low temperature tank maintains the temperature at -160°C~-165°C, and the holding time is 0.5~1 hour; finally, the low temperature tank keeps the temperature at -165°C~-170°C, and the holding time is 0.5~1 hour. The lower end of the steel wall 1 is provided with a leg 19 , which is welded to the steel wall 1 , and the leg 19 is more stably fixed on the lower end of the steel wall 1 through welding.

[0040] In the present invention, when the cryogenic tank is working, the vacuum valve 16 is opened when the cryogenic liquid is input, and the interlayer between the high-strength carbon steel 4 and...

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Abstract

The invention discloses a deep cooling treatment technology for a copper pipe manufacturing die. The deep cooling treatment technology comprises the steps that under driving of an intelligent controller, the machined copper pipe die is placed on a clamp, and the copper pipe die is driven by a clamp to be placed in a liquid nitrogen low-temperature tank; the temperature in the liquid nitrogen low-temperature tank is kept to range from -155 DEG C to -170 DEG C, and the time for heat preservation of the copper pipe die in the low-temperature tank is 2.5-4 h; and after the copper pipe die is takenout, immersing is conducted in warm water at the temperature from 20 DEG C to 30 DEG C, rapid temperature return is conducted, the temperature return speed during immersing is 185 DEG C-210 DEG C / s,and the copper pipe die subjected to deep cooling treatment is obtained. By means of the deep cooling treatment technology, the microstructure of a core head die can be changed, the mechanical performance of a core head is greatly improved, and particularly abrasion resistance and hardness are obviously improved.

Description

technical field [0001] The invention relates to a processing technology for making molds for copper tubes, in particular to a cryogenic treatment process for making molds for copper tubes, and belongs to the technical field of copper tube processing. Background technique [0002] High-precision copper tubes are important materials for air-conditioning and refrigeration equipment and cable communication equipment, and they are widely used. Since these devices have high requirements for the accuracy of copper tubes, they need to be used in conjunction with them in the process of making high-precision copper tubes. High-precision molds. In order to ensure that the copper tube is not deformed or scratched during the production process, the requirements for the corresponding mold are relatively high. For example, for the core head of the copper tube, it is necessary not only to have good hardness, but also to wear resistance. However, most of the die cores currently used to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/04C21D9/00C21D11/00
CPCC21D6/04C21D9/0068C21D11/00
Inventor 李红安罗海潮张德志刘俊彪杨中辉葛会见罗应江常俊杰张贵卢桂焕白洁傅远清娄助军
Owner CHONGQING LONGYU PRECISION COPPER TUBE CO LTD
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