Laser additive heterogeneous alloy repairing method for small-thickness defects on surface of injection mold steel

A laser additive and injection mold technology, applied in the direction of additive processing, additive manufacturing, etc., can solve the problems of complex forming process, large differences in composition and structure, easy cracking, etc., and achieve the effect of good process stability

Pending Publication Date: 2022-07-19
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At this stage, there are many kinds of die steels and the forming process is complex, and the composition and structure are very different, and the powder types suitable for laser deposition forming are rel

Method used

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  • Laser additive heterogeneous alloy repairing method for small-thickness defects on surface of injection mold steel
  • Laser additive heterogeneous alloy repairing method for small-thickness defects on surface of injection mold steel

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[0020] Example 1:

[0021] figure 1 For the schematic diagram of the laser additive hetero alloy repair on the surface of the die steel, the main constituent elements of the matrix and the repair material are redistributed in the molten pool, so as to achieve the ability to achieve high hardness repair.

[0022] The process parameters of laser deposition and forming: the laser power is 2000W, the scanning rate is 6mm / s, the powder feeding rate is 8g / min, the forming process is carried out in an argon atmosphere protection environment (oxygen content <200ppm), and the amount of defocusing during the deposition process The diameter of the light spot is 40mm, the diameter of the spot size is 3mm, the flow rate of the carrier gas is 15L / min, and the surface of the substrate is polished with 240# sandpaper before forming. The repair process adopts a lap rate of 40 to 60%.

[0023] The 316L stainless steel powder is used as the repair material, and the hardened P20 mold is used as...

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Abstract

The invention discloses a laser additive heterogeneous alloy repairing method for small-thickness defects on the surface of injection mold steel, and belongs to the technical field of laser additive repairing. In the process of repairing the small-size defects on the surface of the Cr-series injection mold steel, a Fe-Cr-Ni stainless steel material is adopted as a repairing material, a proper dilution rate is designed by adopting reasonable process parameters, and chemical components in a molten pool are re-optimized by utilizing the dilution effect of a matrix on the molten pool in the deposition repairing process; in other words, the low-strength Fe-Cr-Ni steel can be adopted to achieve high-hardness repairing of the surface of the die steel within a certain thickness range, and the hardness value of a repairing area is higher than the hardness of base metal and a repairing material. The invention provides an important solution for adopting a heterogeneous low-hardness material on the surface of the injection mold steel and realizing high-performance repair.

Description

technical field [0001] The invention belongs to the technical field of laser remanufacturing and repairing, and in particular relates to a laser additive heterogeneous alloy repairing method for small thickness defects on the steel surface of an injection mold. Background technique [0002] As a low heat input, high performance repair technology, laser synchronous powder deposition technology has been widely used in aerospace, automotive and other fields. As an important part of the production and forming process of metal and non-metal parts, molds often face the problem of local failure in the long-term service process of tens of thousands to hundreds of thousands of times. Solving the rapid repair of mold can not only prolong its service life but also save manufacturing cost, which is of great significance for aerospace, automobile, energy and other fields. At present, the laser deposition technology has been applied to the repair of the concave surface of the cold work d...

Claims

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Application Information

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IPC IPC(8): B22F10/28B22F10/366B22F10/85B33Y10/00B33Y70/00B33Y50/02
CPCB33Y10/00B33Y70/00B33Y50/02
Inventor 王志国赵吉宾赵宇辉何振丰张文东
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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