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Cr12MoV cold stamping mold laser repair technology using cobalt-based tungsten carbide as fusion covering alloy

A cobalt-based plus tungsten carbide, laser repair technology, applied in the direction of metal material coating process, coating, etc., can solve the problem that the hardness and wear resistance of the cladding layer cannot meet the production requirements, nickel-based alloy and tungsten carbide hard phase. Poor compatibility, unsuitable for complex mold repair, etc., to achieve the effect of improving resource utilization, dense organization, and small processing volume

Inactive Publication Date: 2014-07-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also the following disadvantages: arc surfacing has a great thermal influence on the substrate; it is not suitable for repairing complex molds; the amount of machining before and after surfacing is large, and the efficiency is low; preheating treatment is required before repairing, which increases the repair cost
However, the hardness of the nickel-based alloy cladding layer is low, and the compatibility between the nickel-based alloy and the tungsten carbide hard phase is poor. After adding tungsten carbide, the hardness and wear resistance of the cladding layer still cannot meet the production requirements.

Method used

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  • Cr12MoV cold stamping mold laser repair technology using cobalt-based tungsten carbide as fusion covering alloy
  • Cr12MoV cold stamping mold laser repair technology using cobalt-based tungsten carbide as fusion covering alloy
  • Cr12MoV cold stamping mold laser repair technology using cobalt-based tungsten carbide as fusion covering alloy

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Experimental program
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Effect test

Embodiment 1

[0038] The cutting edge of the mold is the most prone to failure. The surface of the cutting edge of Cr12MoV cold stamping die steel with a length of 50mm, a width of 12mm, and a thickness of 11mm is repaired by laser cladding (the surface has wear marks with a thickness of 1mm). The final dimensions are 50 x 12 x 12mm workpieces. The Cr12MoV stamping die laser repair process with cobalt base plus tungsten carbide as the cladding alloy is adopted. The specific process steps are:

[0039] (1) Use a grinder to clean surface defects on one side of the Cr12MoV mold steel workpiece in the length direction, and remove surface wear marks, oil stains, etc.;

[0040] (2) Use LDF4000-100 fiber-coupled semiconductor laser, adjust the equipment, use Fe316 alloy powder as the bottom layer, 200g of the alloy powder has been dried at 150°C for 2 hours, adjust the laser power to 3.6kW, and the cladding speed is 3mm / s, laser primer cladding, cladding layer thickness is 1mm, during the claddin...

Embodiment 2

[0047] Laser cladding is performed on both sides of the Cr12MoV cold stamping die steel cutting edge (seriously worn) with a length of 30mm, a width of 30mm, and a thickness of 12mm, so that the cutting edge meets the standard size requirements. The Cr12MoV stamping die laser repair process with cobalt base plus tungsten carbide as the cladding alloy is adopted. The specific process steps are:

[0048] (1) Use a grinder to clean the surface defects on both sides of the Cr12MoV mold steel workpiece in the vertical direction in the length direction, and remove surface wear marks, oil stains, etc.;

[0049] (2) Use the LDF4000-100 fiber-coupled semiconductor laser, adjust the equipment, and perform laser cladding on the wide side first, and use Fe316 alloy powder as the primer layer. 300g of the powder has been dried at 150°C for 2 hours before use, and adjusted The laser power is 3.6kW, the cladding speed is 3mm / s, and the laser cladding is used as a primer. The thickness of the...

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Abstract

The invention discloses a Cr12MoV cold stamping mold laser repair technology using cobalt-based tungsten carbide as fusion covering alloy. The Cr12MoV cold stamping mold laser repair technology comprises the following steps: (1) cleaning defects on the surface of a cold stamping mold, and removing grinding racks, oil stains and microcracks on the surface; (2) using Fe316 alloy powder as a bottoming layer, and carrying out laser bottoming fusion covering; (3) using Co06+WC alloy powder as a covering layer, and after cooling the mold to 300-600 DEG C, carrying out laser fusion covering on the covering layer; and (4) carrying out mechanical machining on the surface of the fusion covering layer. According to the technology, the fusion covering layer with high interface bonding strength and compact structure and without cracks is obtained without preheating, the microhardness of the fusion covering layer reaches 58-62HRC9.8N, particularly the fusion covering layer has good abrasive resistance and can meet the production requirements, and the service life of the cold stamping mold can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of laser cladding and relates to a method for repairing the surface of a mold, in particular to a laser repair process for a Cr12MoV cold stamping die with cobalt base plus tungsten carbide as a cladding alloy. Background technique [0002] Cr12MoV steel is an alloy tool steel with a carbon content of 1.45% to 1.7%. It has high hardenability and small volume changes during quenching. It can be used to manufacture various molds with large cross-sections, complex shapes, and high impact loads. and tools. For example, punching dies with complex shapes, inserts on complex dies, steel plate deep drawing dies, wire drawing dies, cold extrusion dies, cold cutting scissors, etc. The Cr12MoV steel used in the cold stamping die is prone to local wear due to the harsh working environment (high pressure impact, intermittent load). In addition, cold stamping products are generally final products and are no longer machi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C32/00C22C19/07C22C38/58C22C38/40
Inventor 李亚江艾铭杰王娟
Owner SHANDONG UNIV
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