Surface strengthening method of extrusion die

An extrusion die and surface strengthening technology, which is applied in the field of extrusion die surface strengthening, can solve the problems that the friction coefficient of the die surface cannot be reduced, the surface of the extrusion die is prone to wear, and the surface oxidation resistance is not high, so as to achieve the performance of protection , reduce the friction coefficient, improve the effect of hardness

Active Publication Date: 2014-12-10
SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the surface strengthening technology of H13 extrusion die mainly adopts the process of surface nitriding after heat treatment and quenching. Through surface nitriding, the hardness of the mold surface can be increased from the original HV700 to about HV1000-1200. At the same time, the surface after nitriding has A certain anti-oxidation ability prolongs the service life of the mold, and is also adopted by most aluminum and aluminum alloy manufacturers, but this method has certain limitations. (1) The hardness of the surface is increased by 40%-70%. , although the service life of the mold can be significantly improved, but the improvement is still relatively limited. At the same time, considering the cost factor of the nitriding process, the production cost of qualified aluminum and aluminum alloy profiles per unit weight is limited; (2), surface oxidation resistance The performance is still not high, and working for a long time in a medium temperature environment is likely to cause an increase in the extrusion force due to surface oxidation and a decrease in the surface quality of the product; (3), this process cannot reduce the friction coefficient of the mold surface, which is beneficial to improving product quality and reducing Equipment load doesn't help
[0004] Therefore, the surface nitriding process after quenching, which is widely used in the prior art for the surface strengthening treatment of extrusion dies of aluminum and aluminum alloy profiles, still cannot make the treated die surface well meet the service environment of wear resistance and fatigue resistance. requirements, and the surface of the extrusion die treated by this existing process is also prone to wear during work, and may induce cracks and then fatigue failure, resulting in faster die replacement frequency and increased output costs of aluminum profiles. Therefore, for extrusion It is of great significance to propose a new and efficient surface strengthening treatment method for compression dies, especially extrusion dies for aluminum and aluminum alloy profiles

Method used

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Experimental program
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Effect test

Embodiment 1

[0054] The remanufacturing and strengthening treatment of the extrusion die surface made of H13 hot work die steel includes the following steps:

[0055] (1) Perform gas nitriding treatment on the surface of the mold to be treated, the nitriding medium is NH3, the nitriding temperature is 550°C, and the holding time is 12h. After the mold temperature drops to room temperature, take out the mold;

[0056] (2) Use a hand-held polishing grinder to polish the surface of the nitriding mold, remove the "white layer" on the nitriding surface of the mold, and at the same time polish the surface so that the surface of the mold is in a mirror state, and the roughness Ra≯0.40μm;

[0057] (3) Put the polished and polished mold into the ultrasonic cleaning equipment, and use the mixed solution of absolute ethanol and acetone to clean the surface of the mold. The mixing volume ratio of absolute ethanol and acetone is 1.5:1 to ensure the mold The surface is free of oil, rust, and impurities...

Embodiment 2

[0068] The remanufacturing and strengthening treatment of the surface of the extrusion die suitable for common aluminum profiles includes the following steps:

[0069] (1) Perform gas nitriding treatment on the surface of the mold to be treated, and the nitriding medium is NH 3 , the nitriding temperature is 510°C, and the holding time is 10h. After the mold temperature drops to room temperature, take out the mold;

[0070] (2) Use a hand-held polishing grinder to polish the surface of the nitriding mold, remove the "white layer" on the nitriding surface of the mold, and at the same time polish the surface so that the surface of the mold is in a mirror state, and the roughness Ra≯0.40μm;

[0071] (3) Put the mold that has been polished and polished into an ultrasonic cleaning device, and use a mixed solution of absolute ethanol and acetone to clean the surface of the mold. The mixing volume ratio of absolute ethanol and acetone is 1:1 to ensure that the mold The surface is f...

Embodiment 3

[0082] The remanufacturing and strengthening treatment of the surface of the extrusion die suitable for common aluminum alloy profiles includes the following steps:

[0083] (1) Perform gas nitriding treatment on the surface of the mold to be treated, and the nitriding medium is NH 3 , the nitriding temperature is 530°C, and the holding time is 12 hours. After the mold temperature drops to room temperature, take out the mold;

[0084] (2) Use a hand-held polishing grinder to polish the surface of the nitriding mold, remove the "white layer" on the nitriding surface of the mold, and at the same time polish the surface so that the surface of the mold is in a mirror state, and the roughness Ra≯0.40μm;

[0085] (3) Put the polished and polished mold into the ultrasonic cleaning equipment, and use the mixed solution of absolute ethanol and acetone to clean the surface of the mold. The mixing volume ratio of absolute ethanol and acetone is 1.2:1 to ensure the mold The surface is f...

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Abstract

The invention proposes a surface strengthening method of an extrusion die. The method comprises the following steps: introducing a superhard coating life-extending technology, removing oil stains on the surface and close to the surface and participating solid particles by a reasonable surface pretreatment mode, and then carrying out die surface strengthening in an environment at 150-200 DEG C by adopting a multi-layer composite deposition film. Particularly, a multi-layer composite film structure, which takes a TiN film as a priming coat and is combined with a TiAlN film and a CrN film, is formed on the surface of the extrusion die; the friction coefficient of the die surface is reduced by over 60% on the premise that the mechanical property and the geometric accuracy of a die base material are not affected, the Vickers hardness of the die surface is improved by over 2.5 times, the service life of the die is prolonged by over three times, the exchange frequency of the extrusion die and the workload of operating personnel in the production process are greatly reduced, the usability and the production efficiency of the extrusion die are improved, and the equipment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of die surface strengthening, and in particular to a surface strengthening method of an extrusion die. Background technique [0002] In aluminum and aluminum alloy profile production enterprises, the extrusion dies not only need to withstand strong friction and wear under high temperature and high load, but also need to withstand cyclical loads, and the working conditions are very harsh. At present, in order to meet the requirements of wear resistance, high temperature resistance, and fatigue resistance, the extrusion dies of aluminum and aluminum alloy profiles generally use H13 hot work die steel, which has good comprehensive performance at medium temperature and high hardenability. The quenching medium does not produce cracks, and the hardness of the material after quenching is greater than HRC 50. It is suitable for hot processing molds with a temperature below 600 ° C, and because the hot extrusion temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/04C23C14/35C23C14/06
Inventor 王春昌马尚刘鸣戴君畅庚榕
Owner SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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