Shot peening: Surface treatment with shot peening has a strong impact and obvious cleaning effect. However, the treatment of thin-plate workpieces by shot peening is easy to deform the workpiece, and the steel shot hits the surface of the workpiece (whether shot blasting or shot peening) to deform the metal substrate. Since Fe3O4 and Fe2O3 have no plasticity, they peel off after being broken, and the oil film and The substrate are deformed together, so for workpieces with oil stains, shot blasting and shot peening cannot completely remove the oil stains.
Shot peening features:
- Great flexibility in cleaning. It is easy to clean the inner and outer surfaces of complex workpieces and the inner wall of pipe fittings; and is not limited by the site, it can be moved to the vicinity of extra-large workpieces for cleaning.
- The structure of the equipment is simple, the investment of the whole machine is low, the wearing parts are few, and the maintenance cost is low.
- It consumes a lot of energy and must be equipped with a high-power air compressor station.
- The cleaning surface is prone to moisture and rust.
- Low cleaning efficiency, many operators, and high labor intensity.
Shot blasting features:
- Poor flexibility. Due to the limitation of the site, cleaning the workpiece is somewhat blind, and it is easy to produce dead spots on the inner surface of the workpiece that cannot be cleaned.
- There is no need to use compressed air to accelerate the projectile, and it is not necessary to set up a high-power air compressor station.
- The cleaning surface is not easy to have moisture, and it is not easy to rust.
- The structure of the equipment is relatively complicated, and there are many wearing parts, especially the parts such as blades, which require many maintenance hours and high costs.
- High cleaning efficiency, low cost, few operators, easy to realize automatic control, suitable for mass production.
The difference between shot peening and shot blasting
Shot blasting uses high-pressure air or compressed air as power, and shot blasting is generally a high-speed rotating flywheel that ejects steel grit at high speed. Shot peening has high efficiency, but there will be dead ends, while shot peening is more flexible but consumes a lot of power.
Although the two processes have different jetting power and methods, they are both aimed at the high-speed impact of the workpiece, and their effects are the same. In comparison, shot peening is finer and easier to control the accuracy, but the efficiency is not as high as shot peening, and the shape is complex. For small workpieces, shot blasting is more economical and practical, and it is easy to control the efficiency and cost. The particle size of the shot can be controlled to control the ejection effect, but there will be dead corners. It is suitable for batch processing of workpieces with a single shape and surface. The selection of the two processes mainly depends on the workpiece. shape and processing efficiency.
The difference between shot blasting and sandblasting
Shot blasting and sandblasting both use high-pressure air or compressed air as power to blow it out at high speed to impact the surface of the workpiece to achieve the cleaning effect, but the effect of the selected medium is different. Removed, the surface of the workpiece is slightly damaged, and the surface area is greatly increased, thereby increasing the bonding strength of the workpiece and the coating/plating layer.
The surface of the workpiece that has been sandblasted is metallic, but because the surface is rough, the light is refracted, so there is no metallic luster, and it is a darkened surface. After the shot peening, the dirt on the workpiece surface is removed, and the workpiece surface Without being damaged, the surface area has increased. Since the surface of the workpiece is not damaged during the processing, the excess energy generated during processing will lead to the surface strengthening of the workpiece matrix. The surface of the workpiece after shot peening is also metallic, but Since the surface is spherical, part of the light is refracted, so the workpiece is processed into a matte effect.
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