Shot peening of metal shrapnel

Nowadays, the variety of hardware shrapnel occupational raw materials is increasing, and its subsequent processing methods are constantly changing and improving, such as structural shape, heat treatment and appearance quality processing, etc., so that the use of hardware shrapnel can more satisfy the functional requirements of special products. , And further improved the application characteristics of hardware shrapnel products. Shot peening of 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 surface finish is repaired with small balls for the second time. 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 hardware The profession of 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 residual stress of the product can reach 1500 MPa, thus achieving high fatigue resistance. effect.