Shot peening of precision metal shrapnel 'hardware'

Nowadays, the variety of professional original materials of precision metal shrapnel is increasing day by day, and its subsequent processing methods are constantly changing and improving, such as structure shape, heat treatment and appearance quality processing, etc., so that the use of precision metal shrapnel can more satisfy the functional requirements of special products. At the same time, it has further improved the application characteristics of precision hardware shrapnel products. Shot peening of precision metal shrapnel is one of them. 1. Combination shot peening. Combination shot peening is also called multiple shot peening. Many of them use secondary shot peening. The product is strengthened by spraying with different shots. Larger diameter shots are used for the first time. After the residual compressive stress is removed, the second time is to use the small ball pill to beautify the surface finish. 2. Stress shot peening skills. Stress shot peening is an experienced shot peening skill, but it is difficult to use it for mass production. However, in recent years, due to the rapid development of the automotive industry and the improvement of stress shot peening equipment, it has been used in automotive precision The profession of hardware shrapnel has been well represented. Especially the combined application of stress-strengthening shot peening and other shot peening techniques. Stress shot peening is usually set at 800 MPa or so. After stress shot peening, the peak value of the residual stress of the product can reach 1500 MPa, thus achieving high fatigue resistance. effect.