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Vacuum low-pressure ultra-shallow layer carburizing heat treatment method

A heat treatment method, vacuum and low pressure technology, applied in coating, solid diffusion coating, metal material coating process, etc., can solve problems such as furnace gas aging, blind holes of parts, dense packaging production, etc., to improve efficiency and simplify operation , cost reduction effect

Inactive Publication Date: 2018-02-27
成都万可瑞特金属科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The parts are heated and carburized in a cycle within the set low vacuum upper and lower limits, and the furnace gas is repeatedly discharged and replaced by the new within the set time period, which solves the problem of blind holes, dead ends, dense production, and furnace gas aging of parts during the carburizing process. , the uniformity of the penetration layer and other difficulties

Method used

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  • Vacuum low-pressure ultra-shallow layer carburizing heat treatment method

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Embodiment 1

[0058] The invention proposes a vacuum low-pressure ultra-shallow layer carburizing heat treatment method, which forms a "carburizing-diffusion" pulsed carburizing process by vacuuming to carry out carburizing stage treatment in the carburizing process; the carburizing process of parts is a continuous process. The pulse cycle process of automatic vacuuming and replenishing carburizing agent. The parts are heated and carburized in a cycle within the set low vacuum upper and lower limits, and the furnace gas is repeatedly discharged and replaced by the new within the set time period, which solves the problem of blind holes, dead ends, dense production, and furnace gas aging of parts during the carburizing process. , The uniformity of the infiltration layer and other difficulties. The heating chamber used in the present invention is preferably a vacuum carburizing furnace (VCOQ2-150).

[0059] The carburizing heat treatment process uses vacuum furnace technology to carry out low...

Embodiment 2

[0061] This embodiment is further optimized on the basis of the above-mentioned embodiments, and further in order to better realize the present invention, the following setting method is adopted in particular: the "carburizing-diffusion" pulsed carburizing process is specifically:

[0062] 1) Carburizing: Under vacuum conditions, feed carburizing gas into the heating chamber and keep it, and carburize the parts; the preferred flow rate of carburizing gas is 1500-4800L / h;

[0063] 2) Diffusion: After carburizing, vacuumize the heating chamber, extract the aging gas, and maintain it, and carry out diffusion treatment on the parts;

[0064] 3) Cycle step 1) and step 2) until the set carburizing stage time is over. When setting, the preferred carburizing stage time is 5~120min.

[0065] Vacuum low-pressure ultra-shallow carburizing realizes a carburizing process that adapts to different materials and part structures by changing the introduction of carburizing gas and the removal o...

Embodiment 3

[0067]This embodiment is further optimized on the basis of any of the above-mentioned embodiments. Further, in order to better realize the present invention, the following setting method is adopted in particular: the carburizing retention time in the initial carburizing stage is greater than or equal to the diffusion retention time, In the late carburizing stage, the carburizing retention time is less than or equal to the diffusion retention time; due to the vacuum pumping and carburizing agent (carburizing gas) technology, by adjusting the vacuum and carburizing agent time is to adjust The pulse interval time can well adjust the carbon concentration on the surface of the carburized layer, and the depth of the carburized layer can be adjusted by adjusting the carburized time.

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Abstract

The invention discloses a vacuum low-pressure ultra-shallow layer carburizing heat treatment method. Through the vacuum pumping manner, the carburizing-diffusion pulse type carburizing process is formed, the carburizing stage treatment of the carburizing process link is carried out, and the shortcomings that a common carburizing heat treatment process is long in period, high in energy consumption,high in cost, and unstable in carburizing quality, time and labor are wasted, according to a common carburizing technology, the depth of a carburizing layer is not easily ensured, and the carburizinglayer depth and the surface hardness uniformity are poor are overcome. Through the application of the vacuum low-pressure ultra-shallow layer carburizing heat treatment method, quality of a carburizing part is ensured, the carburizing layer depth and the surface hardness uniformity are improved, various property indexes of part carburizing are improved, the carburizing heat treatment process period is shortened, the energy is saved, the part carburizing heat treatment cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the fields of vacuum carburizing heat treatment technology and the like, specifically, a vacuum low-pressure ultra-shallow layer carburizing heat treatment method. Background technique [0002] Carburizing treatment refers to a chemical heat treatment process in which the steel is heated in a carburizing medium and kept warm for carburizing to allow carbon atoms to penetrate into the surface of the part in order to increase the carbon content of the surface of the steel and form a certain carbon concentration gradient. [0003] Carburizing is the process of infiltrating carbon atoms into the surface layer of steel. It is also to make the parts of low carbon steel have the surface layer of high carbon steel, and then after quenching and low temperature tempering, the surface layer of the parts has high hardness and wear resistance, while the central part of the parts still maintains the toughness and toughness of low carbon stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C23C8/80
CPCC23C8/22C23C8/80
Inventor 吴小平
Owner 成都万可瑞特金属科技有限公司
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