High-kinetic-energy micro-particle composite shot blasting surface strengthening process

Abstract

The invention discloses a high-kinetic-energy micro-particle composite shot blasting surface strengthening process. The process comprises the following steps of (1) setting shot blasting parameters; (2) shot treatment; (3) preparing shots; (4) placing a workpiece in place; (5) front shot blasting; and (6) reverse shot blasting. According to the process, aiming at the defects in the prior art, medium-frequency induction heating is used while micro-particles are subjected to shot blasting, micro-particles are heated to a certain temperature and ejected out through medium-frequency induction heating while shots generate kinetic energy under pushing of compressed air, after heated micro-particles make contact with the surface of the workpiece, a high heat conduction effect is generated, the surface of the workpiece is heated, surface hardness is reduced, high-kinetic-energy particles can further refine metal grains on the surface layer of the workpiece, while a strong surface pressure layer is generated, a grain size of the surface of the workpiece is improved, a surface contact stress of the workpiece is improved, and the fatigue life of the workpiece is prolonged.

Description

technical field [0001] The invention belongs to the field of shot peening treatment, and in particular relates to a high kinetic energy particle composite shot peening surface strengthening process. Background technique [0002] Conventional shot peening treatment is to spray steel shot, glass shot and ceramic shot onto the surface of the workpiece to cause plastic deformation of the workpiece to form a certain compressive stress strengthening layer, and a high residual stress is formed in the strengthening layer. The existence of the workpiece can offset part of the stress when the workpiece is under load, thereby improving the fatigue strength of the workpiece. The advantages of shot peening are that the equipment is simple, the cost is low, it is not limited by the shape and position of the workpiece, and it is easy to operate. The disadvantage is that the working environment is poor, the unit output is low, and the efficiency is lower than shot blasting. The types of sh...

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Problems solved by technology

[0003] In the actual operation, it is found that in the process of shot peening with 0.1mm particles, due to the high hardness and high strength of the processed workpiece, it is difficult to form a satisfactory surface compressive stress layer, and the pressure should be small, and the formed stress layer is relatively small. Shallow, cannot effectively improve the fatigue life of metal workpieces under cyclic stress

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