Laser additive repairing method for H13 steel mold

Abstract

The invention discloses a laser additive repairing method for an H13 steel mold. The laser additive repairing method comprises the following steps that (1) a to-be-repaired area of the H13 steel mold is pretreated; (2) spherical H13 steel mixed powder with different particle size distribution is adopted for conducting laser metal deposition on the to-be-repaired area through laser additive manufacturing, the position and angle of a nozzle are dynamically adjusted according to the characteristics of the to-be-repaired area, and laser power is dynamically adjusted according to the number of deposition layers; and (3) milling a deposition layer formed by laser metal deposition. By means of the method, laser additive repairing can be conducted on various surfaces such as the plane, the inclined face and the arc face of the H13 steel mold, the strength, hardness and impact toughness of a repairing area are large, and good metallurgical bonding is formed between the repairing area and an H13 steel mold base body.

Description

technical field [0001] The invention relates to the technical field of laser metal material processing, in particular to a laser additive repair method for H13 steel moulds. Background technique [0002] H13 steel is a kind of hot work die steel, which is formed by adding alloy elements on the basis of carbon tool steel. H13 steel has high strength, hardness and toughness, and has good thermal fatigue resistance and medium wear resistance. It is a kind of steel with both strength and toughness. It occupies an important position in the field of die-casting molds. The die casting mold core is made of H13 steel. Die-casting molds are prone to problems such as failure and cracks after experiencing multiple temperature cycle changes and alternating stress cycles under harsh service conditions. Die casting is currently developing in the direction of large-scale and complex. Mold production has problems such as long manufacturing cycle and high cost. Repairing failed molds can pr...

AI Technical Summary

Problems solved by technology

Die-casting molds are prone to problems such as failure and cracks after undergoing multiple temperature cycle changes and alternating stress cycles under harsh service conditions.

Die casting is currently developing in the direction of large-scale and complex. Mold production has problems such as long manufacturing cycle and high cost. Repairing the failed mold can prolong the service life of the mold, improve the utilization rate of materials, and reduce production costs.

[0003]The repair of mold steel usually adopts welding technology (eg: CN 112935485 A) and laser selective melting technology (eg: CN 111270146 A), but both technologies exist Many problems are mainly manifested in the following aspects: 1) During the welding process, a large amount of heat needs to be input, the heat-affected zone is large, and the performance of the relevant parts of the base metal is significantly reduced. At the same time, the high residual stress during the welding process is likely to cause workpiece Warping and deformation; 2) The forming efficiency of laser selective melting technology is low. The original shape and size of some workpieces in additive manufacturing need to be easy to spread powder, but powder spreading on curved or arc surfaces is difficult, and the shape of die-casting or injection molded parts is usually very Complex, so laser selective melting technology is difficult to use for the repair of die-casting / injection molds with complex surfaces

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