Clamping electrified heating and rotary electric field stirring based laser cladding method and device

Abstract

The invention discloses a laser cladding method and device based on clamping electric heating and rotating electric field stirring, including laser equipment, a combined power supply, a clamping part, an adjustment mechanism and a controller, and the clamping part is arranged on the laser head of the laser device The lower end of the cladding substrate is used to clamp the cladding substrate. The clamping part includes a bottom plate with a conductive sheet and two facing clamping plates. The clamping plate moves in the horizontal plane under the action of the adjustment mechanism and is aligned with the laser equipment. Form a stable clamping force; the combined power supply energizes the conductive sheet of the clamping part, and the controller controls the energization type, sequence and / or positive and negative of the combined power supply to form a rotating current field on the surface of the substrate, causing the substrate to generate a rotating current Field, moving induced electromagnetic field and changing induced electromagnetic force realize stirring of molten pool.

Description

technical field [0001] The invention relates to a laser cladding method and device based on clamping electric heating and rotating electric field stirring. Background technique [0002] With the development of high-power lasers, laser cladding has emerged as a new surface modification technology. The use of lasers to melt alloy powder on the surface of the substrate and then solidify into a coating with excellent performance can significantly improve the mechanical properties of the workpiece surface. Since the formation of the cladding layer is a chemical metallurgical process of rapid melting and solidification, the heat-affected zone range of the laser beam on the base material is small, and the deformation caused is also small, which can reduce the scrap rate of parts and increase their service life. Therefore, laser Cladding technology has been applied on a large scale. [0003] However, the rapid melting and cooling process will cause an excessive temperature gradient...

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent with the patent number CN 106637200 A discloses a method for thermal, acoustic and magnetic composite energy field-assisted laser cladding of metal-based ceramic coatings, which is characterized in that it adopts multi-layer energy field-assisted laser cladding, which can obtain relatively high Good performance cladding layer, but this method has too many steps, is too cumbersome and complicated, and uses a single direction induction heating coil to heat the substrate indirectly, which will make the surface of the substrate heated unevenly

[0005] The Chinese invention patent with the patent number CN 103602977 B discloses a device for realizing the method of refining the solidification structure of the cladding layer metal coating with pulse current, which is characterized in that pulse current is used to supply power to the substrate during laser cladding, and the fine The structure of the cladding layer has a certain effect, but the function of this method is too single, and the effect of reducing pores and cracks is not obvious, and the device is too simple, without clamping and fixing devices

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