A Surface Strengthening Process of High Kinetic Energy Microparticle Composite Shot Peening

Abstract

The invention discloses a high-kinetic-energy particle composite shot peening surface strengthening process, the steps of which include: (1) shot peening parameter setting; (2) shot treatment; (3) shot batching; (4) workpiece positioning; (5) ) Front side shot peening; (6) Back side shot peening. The present invention aims at the defects in the prior art. While the particles are blasted, medium-frequency induction heating is used. While the pellets generate kinetic energy under the push of compressed air, the particles are heated to a certain temperature and ejected through medium-frequency induction heating, with After the high-temperature particles contact the surface of the workpiece, a strong heat conduction effect will be generated, which will cause a temperature rise on the surface of the workpiece and reduce the surface hardness, so that the high-kinetic energy particles can further refine the metal grains on the surface of the workpiece and produce a strong surface pressure layer. , improve the surface grain size of the workpiece, increase the surface contact stress of the workpiece, and strengthen the fatigue life of the workpiece.

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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