Metal surface shot peening process

　　Parameters that affect shot peening quality

　　1. Shot peening intensity. The process parameters that affect shot peening intensity mainly include: projectile diameter, projectile velocity, projectile flow rate, shot peening time, etc.

　　2. Coverage Factors that affect coverage: hardness of part material, Projectile diameter, injection angle and distance, shot peening time, etc.

　　3. Surface roughness Factors affecting roughness: strength and hardness of the part material, projectile diameter, injection angle and speed, original surface roughness of the part After shot peening The size of residual compressive stress on the sprayed surface of characteristic parts and the depth of

　　the compressive stress layer depend on the properties of the sprayed material and the shot peening intensity.

　　The higher the strength and hardness of the material, the greater the compressive stress and the shallower the depth of the compressive stress layer. The higher the shot peening intensity, the greater the depth of the compressive stress layer. The material structure of the sprayed surface layer changes. The sprayed surface changes. Gotta be rough. The roughness of the blasted surface becomes worse as the shot peening intensity increases, the surface hardness decreases, and the shot size decreases. Increased size. The metal on the sprayed surface is extruded, forming tiny metal crests, so the size increases.

　　Shot peening application range Shot peening can prevent bending fatigue of automobile parts; shot peening can improve the bending fatigue properties of the tooth profile root; shot peening can improve the fatigue resistance and safe service life of the crankshaft; shot peening can increase the length of the connecting rod Strength and stiffness; the powerful shot peening process can improve the bending fatigue strength and contact fatigue strength of the gear teeth, which is an important way to improve the anti-biting ability of the gear and increase the life of the gear; surface shot peening is to improve the stress resistance of fasteners against fatigue fracture An effective surface strengthening process to prevent corrosion and hydrogen embrittlement fracture. After shot peening, the reliability and durability of the workpiece can be significantly improved; surface shot peening can improve the fatigue performance (including stress corrosion performance) by changing the structure of the material, which can improve the quality of fasteners.