Wide-band laser-induced hybrid cladding restoration and surface strengthening method for dies

Abstract

A wide-band laser-induced hybrid cladding repairing and surface strengthening method for dies is characterized in that a Ni based alloy powder for wide-band laser-induced hybrid cladding is used to repair damaged areas of dies or strengthen the surface of dies. By the adoption of a wide-band scanning system, different dies such as plastic die, hot work die, cold work die and the like can be repaired and undergo surface strengthening. The width of a single track laser-induced hybrid cladding layer reaches 20-30mm; the thickness of each track cladding can reaches 3mm; laser scan speed reaches 10m / min; the powder flow reaches 15kg / h; the powder utilization rate is 90%; the efficiency is raised by 5-10 times in comparison with simple laser cladding; repairing time is shortened by 30%; energy is saved by 10-40%; defects such as pores and crack in the coating are eliminated; wear resistance, corrosion resistance, antioxidation performance and fatigue resistance of dies are greatly raised; and the service life of dies can be increased by 3-10 times.

Description

technical field [0001] The invention relates to a method for broadband laser induction composite cladding repair and surface strengthening mold, and belongs to the technical field of laser repair molds. Background technique [0002] As we all know, molds are necessary and important equipment in the fields of machinery, metallurgy, electronics, light industry and national defense. In our country, due to wear, mechanical damage and defects in the casting process of the mold during use, it is easy to produce substandard products and mold failure, and the annual economic loss is billions of RMB. Therefore, the mold must be repaired and surface strengthened. [0003] At present, the methods of mold repair and surface strengthening usually include: [0004] (1) Electroplating: It has the advantages of mature technology and low cost, but the disadvantages are that the coating is thin, the bonding force with the mold is poor, the parts with large shape damage are difficult to repa...

AI Technical Summary

Problems solved by technology

[0004] (1) Electroplating: It has the advantages of mature technology and low cost, but the disadvantages are that the coating is thin, the bonding force with the mold is poor, the parts with large shape damage are difficult to repair and pollute the environment

[0005] (2) Overlay welding: Commonly used overlay welding methods include brazing, arc welding, gas shielded welding, plasma arc welding, etc. During overlay welding, the heat input is large, resulting in a large heat-affected zone of the mold and easy deformation

[0006] (3) Thermal spraying: the process is simple, but the coating is prone to pores, and there are shortcomings such as low bonding strength between the coating and the mold

However, the conventional laser cladding method has the problems of low efficiency, low strength, and easy cracking of the cladding layer.

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