Sandblasting machine parts introduction The surface layer that undergoes cyclic plastic deformation will change with different materials
Shot peening is a process in which the projectile stream continuously hits the surface material of the fastener, thereby causing the surface layer (depth of about 0.05 to 0.20 mm) to undergo cyclic plastic deformation. The surface layer subjected to cyclic plastic deformation will vary with the material according to one or more of the following:
1. A residual compressive stress field is formed in the surface layer;
2. Changes in the substructure (subgrain) size and lattice distortion of surface materials;
3. Plastic transformation induced phase change;
4. Changes in material density in the plastic layer.
The sand blasting machine accessories describe the residual compressive stress field introduced by the blast plastic deformation of the surface layer of the material. After superimposing the tensile stress with the externally applied alternating stress on the same cross section, the maximum tensile stress that the material undergoes is moved from the surface to the subsurface position.
Fatigue cracks on the surface without shot peened specimens originated on the outer surface, while fatigue cracks strengthened by shot peened surface deformation originated on the subsurface layer. Theoretical analysis confirms that after the deformation residual stress induces fatigue cracks on the secondary surface of the material, an internal fatigue limit of 1.05 to 1.35 times higher than the surface fatigue limit can be obtained.
Surface shot peening is an effective surface strengthening process to improve the fatigue corrosion-resistant stress corrosion and hydrogen embrittlement fracture of fasteners. Projectiles include cast steel shots, glass shots, ceramic shots, etc. The surface roughness of the reinforced fastener is 0.65 μm to 2 μm, and the achievable surface roughness is 0.63 to 2.5 μm. The reliability and durability of the workpiece can be significantly improved. Improve and improve.
Shot peened glass beads (GlassBead) is a kind of abrasive with unique characteristics widely used in cleaning or metal surface strengthening treatment, mainly used in sandblasting equipment. Shot peened glass beads are crushed and sorted from high quality cullet. During manufacturing, the broken glass is fused into a ball and then annealed to eliminate internal stress and prevent breakage. This transparent and clear spherical structure product will not have particles embedded in the workpiece, pollute the workpiece or cause other damage during use. With different sizes of abrasives and different operating parameters, shot glass beads will achieve different gloss levels on the surface of the workpiece. The use of shot peened glass beads on the surface of the workpiece for selective local coverage and controlled blasting can produce special decorative effects.
The excellent performance of the shot blasted glass beads of the sand blasting machine parts will not damage the surface of the workpiece when cleaning or deburring the workpiece with strict deviation requirements, which is very suitable for selection. Furthermore, the inherent strength of shot peened glass beads makes it suitable for use in equipment capable of recycling abrasives.