Modification method for cladding cylindrical surface of bar based on electron beam toroidal gun

Abstract

The invention discloses a modification method for cladding the cylindrical surface of a bar based on an electron beam toroidal gun. The modification method comprises the following steps: firstly turning the surface of a bar base body requiring improvement of the surface properties to remove an oxide layer on the surface, then polishing the surface after removing residual lubricating oil after processing, then roughening the surface with adhesive paper, then clearing away oil stains on the surface and putting the bar base body in a dryer for later use; then heating modified layer powder and preparing coat slurry with the modified layer powder molten by heating; then carrying out sand blasting on the surface of the base body, then spraying the coat slurry on the surface of the base body with an air compressor to form a coat and carrying out seal treatment on the coat; finally putting the obtained bar base body with the preset coat in vacuum electron beam processing equipment to undergo electron beam cladding modification treatment. The method can achieve the effects of improving a series of mechanical, physical and chemical properties of the surface of the bar, such as corrosion resistance, hardness and wear resistance, and improving the properties which the surface of the bar is expected to achieve to the utmost extent.

Description

technical field [0001] The invention relates to a method for modifying the cylindrical surface of a metal bar, in particular to a process method for cladding and modifying the cylindrical surface of a metal bar based on an electron beam annular gun, and belongs to the technical field of material surface treatment. Background technique [0002] Material surface treatment refers to coating the surface of the material matrix or changing the surface morphology, chemical composition, phase composition, microstructure, and defect state, so that it has better performance than the matrix material, so as to improve the ability of the material to resist environmental effects or endow the material The process method of surface with certain functional characteristics. With the rapid development of high-tech, people have put forward higher standards for the surface properties of workpieces, but the original standards of hardness, wear resistance and corrosion resistance are far from meet...

AI Technical Summary

Problems solved by technology

[0003] Applying the existing electron beam to the surface cladding of the bar can only be done through the method of multi-pass lapping. Because this method requires multiple processing of the bar workpiece, the coating and a part of the substrate melt rapidly during the process. During the solidification process, it is bound by the surrounding matrix, so that the heat energy cannot be dissipated in time, resulting in stress and cracks, which affect the service life of the bar.

During the multi-pass processing of the electron beam, the heat of the previous pass is not dissipated in time, and it is heated by the new pass, so that the heat is concentrated, and the cladding coating of the bar is treated again, so that the temperature in the obtained cladding layer is relatively high. Low alloy precipitation will affect the surface properties, coarse structure will affect the surface properties such as wear resistance and hardness

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