A Modification Method Based on Electron Beam Ring Gun Cladding Bar Cylindrical Surface

Abstract

The invention discloses a method for modifying the cylindrical surface of a bar stock based on an electron beam annular gun cladding. Firstly, the surface of the bar stock substrate whose surface performance is to be improved is turned to remove the surface oxide layer, and then the residual lubricating oil is removed. Grinding, then roughening with sandpaper, then removing the surface oil, and putting it in a drier for later use; then heating the modified layer powder, and making the heated and melted modified layer powder into a coating slurry; The surface of the substrate is sand blasted, and then the coating slurry is sprayed on the surface of the substrate by an air compressor to form a coating, and the coating is closed for sealing treatment; finally, the obtained pre-coated rod substrate is placed in a vacuum electron beam processing Electron beam cladding modification treatment is carried out in the equipment. The method of the invention can improve a series of mechanical, physical and chemical properties such as corrosion resistance, hardness and wear resistance of the surface of the bar, and can greatly improve the performance expected to be achieved on the surface of the bar.

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 A process method to surface certain functional properties. 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 meeting the requ...

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

Images