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Laser impact method for extrusion die key part

A technology for extrusion dies and key parts, which is applied in the field of surface laser shock strengthening of key parts of extrusion dies. It can solve problems such as die damage and product quality affecting the service life of the die, so as to ensure quality and performance, improve service life and production. Efficiency, improve the effect of stress corrosion resistance

Inactive Publication Date: 2015-06-03
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the advancement of science and technology and the higher and higher requirements for product quality in all walks of life, the requirements for molds at this stage are also getting higher and higher. Due to physical and chemical effects such as thermal fatigue, thermal erosion and severe friction and wear, the weak part of the mold will be damaged and failed early, which will affect the service life of the mold and the quality of the product

Method used

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  • Laser impact method for extrusion die key part
  • Laser impact method for extrusion die key part
  • Laser impact method for extrusion die key part

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Select the extrusion punch made of H13 material, at the quenching temperature of 1020-1060°C and tempering temperature of 560-650°C, increase its hardness, improve its internal microstructure and stress state, so that the surface hardness value after heat treatment is 52HRC, the surface The roughness reaches 0.12μm. Through the comparison of the extrusion punch before and after use, it is found that the outer surface of the extrusion punch has the most severe friction and wear when it is working.

[0031] From figure 1 and figure 2 It can be seen from the figure that the outer surface of the extrusion punch is cylindrical, so the laser impact path is gradually impacted along the outer cylindrical surface of the extrusion punch from top to bottom until the impact is completed; the laser impact parameters are as follows: The area to be impacted by the punch is coated with 0.2mm black paint as the absorbing layer, and the 0.3mm water flow layer is used as the confinement...

Embodiment 2

[0033] Firstly, the material W18Cr4V used in the extrusion die is heat-treated, the quenching temperature is 1200-1240°C, and the tempering temperature is 550-700°C to increase its hardness, improve its internal microstructure and stress state. After heat treatment, its surface hardness value is 56HRC. The roughness reaches 0.09μm. Through the comparison of the extrusion die before and after use, it is found that the inner surface of the extrusion die has the most severe friction and the most serious wear during operation. From Figure 4 and Figure 5 It can be seen from the figure that the inner surface of the extrusion die is a cylindrical surface, so the laser impact path gradually impacts along the inner cylindrical surface of the extrusion die from top to bottom until the impact is completed; the laser parameters are: A 0.2mm black paint is applied to the area to be impacted on the concave die as an absorbing layer, and a 0.3mm water flow layer is used as a confinement la...

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Abstract

The invention belongs to a die surface modifying technique and particularly relates to a laser impact method for an extrusion die key part. The method comprises the following steps: first conducting quenching and tempering heat treatment on an extrusion die; by analyzing the stress, heating and frictional wear of the extrusion die when the extrusion die operates, obtaining the extrusion die key part which is liable to generate a crack source and suffer a wear failure; selecting a laser impact parameter and an impact path according to the position and outline shape of the key part to perform laser impact; measuring the dimensional variation amount of the surface of the key part after laser impact is finished; designing the dimension of a new key part according to the dimensional variation amount; and conducting laser impact on the new extrusion die key part again to obtain a target extrusion die finally. Through the adoption of the laser impact method provided by the invention, the stress corrosion resistance, fatigue resistance and wear resistance of the extrusion die key part are improved, and meanwhile the manufacturing requirements of the extrusion die are met; and the service life and production efficiency of the extrusion die are increased.

Description

technical field [0001] The invention belongs to the mold surface modification technology, and relates to a surface laser shock strengthening method for key parts of an extrusion mold. Background technique [0002] Entering the 21st century, my country's manufacturing industry has developed rapidly, and the mold industry plays a pivotal role in it, involving aviation, aerospace, electronic information, automobiles and other fields. With the advancement of science and technology and the higher and higher requirements for product quality in all walks of life, the requirements for molds at this stage are also getting higher and higher. Due to physical and chemical effects such as thermal fatigue, thermal erosion and severe friction and wear, the weak parts of the mold will be damaged and failed early, which will affect the service life of the mold and the quality of the product. Applying a new surface strengthening method can improve the stress state of the mold surface, genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09
CPCC21D10/005
Inventor 王匀杜金星于浩许桢英殷苏民柏云王建杰李超
Owner JIANGSU UNIV
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