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Laser additive repairing method for H13 steel mold

A laser additive and repair method technology, applied in additive processing, process efficiency improvement, additive manufacturing, etc., can solve the problems of large thermal influence, large heat input, long manufacturing cycle, etc., and achieve high hardness and impact toughness , reduce internal cracks and maintain uniformity

Active Publication Date: 2022-03-25
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Laser additive repairing method for H13 steel mold
  • Laser additive repairing method for H13 steel mold
  • Laser additive repairing method for H13 steel mold

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A kind of laser additive repairing method of H13 steel mould, it comprises the following steps (process flow chart as figure 1 shown):

[0048] 1) Determine the area to be repaired of the H13 steel mold. The area to be repaired is flat and has microcracks with a depth of 1 mm. First, the H13 steel that is 2 mm below the bottom of the area to be repaired and 3 mm outside the center is removed by milling, and the area to be repaired is processed into trapezoidal groove, and then use 400# sandpaper to grind the milling area to a surface roughness Ra value of 3.2, and then clean the milling area with absolute ethanol;

[0049] 2) Spherical H13 steel mixed powders with different particle size distribution were prepared by aerosol method (scanning electron microscope picture as figure 2 shown), the mass percentages of spherical H13 steel mixed powders with different particle size distributions are: C: 0.32% to 0.45%; V: 0.80% to 1.20%; Cr: 4.75% to 5.50%; Mo: 1.10% to 1.75%...

Embodiment 2

[0058] A kind of laser additive repairing method of H13 steel mould, it comprises the following steps (process flow chart as Figure 7 shown):

[0059] 1) Determine the area to be repaired of the H13 steel mold. The area to be repaired is a curved surface, and there are microcracks with a depth of 3 mm. First, remove the H13 steel 2 mm below the bottom of the area to be repaired and 3 mm outside the center by milling, and process the area to be repaired into Arc groove, and then use 400# sandpaper to grind the milling area to a surface roughness Ra value of 3.2, and then clean the milling area with absolute ethanol;

[0060] 2) Spherical H13 steel mixed powders with different particle size distributions were prepared by aerosol method. The element mass percentages of the spherical H13 steel mixed powders with different particle size distributions were: C: 0.32%-0.45%; V: 0.80%-1.20%; Cr: 4.75% to 5.50%; Mo: 1.10% to 1.75%; Mn: 0.20% to 0.50%; Si: 0.80% to 1.20%; P: 0.03%; Fe:...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/66C22C38/02C22C38/04C22C38/22C22C38/24B22F7/08B33Y10/00B33Y40/20B33Y80/00
CPCB22F10/28B22F7/062B22F10/66C22C38/02C22C38/04C22C38/22C22C38/24B33Y10/00B33Y40/20B33Y80/00B22F2007/068Y02P10/25
Inventor 赵海东梁华耀王果邓朝阳马文有
Owner SOUTH CHINA UNIV OF TECH
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