Shot blasting is used to remove scale, rust, molding sand and old paint film on medium and large metal products and castings and forgings with a thickness of not less than 2 mm or which does not require accurate dimensions and contours. It is a cleaning method before surface coating (plating). Widely used in large shipyards, heavy machinery plants, automobile plants, etc.
Shot peening is a cold process that is widely used to improve the fatigue resistance of long-term service to metal parts such as aircraft engine compressor blades, fuselage structural parts, and automotive transmission system parts under high stress conditions.
Shot peening is a high-speed and continuous spraying of a myriad of small circles called steel shots in a fully controlled state, which is beaten to the surface of the part to create a residual compressive stress layer on the surface. Because when each steel shot hits the metal part, it is like a micro rod that hits the surface and punctures small indentations or depressions. In order to form a depression, the metal surface layer must be stretched. Under the surface layer, the compressed grains attempt to restore the surface to its original shape, resulting in a hemisphere with a high compressive force. Innumerable depressions overlap to form a uniform residual compressive stress layer. Finally, the parts under the protection of the compressive stress layer greatly improve the fatigue strength and extend the safe working life.
Shot peening is divided into shot peening and sand blasting. The surface treatment is carried out by shot peening, and the impact force is large, and the cleaning effect is obvious. However, the treatment of the sheet metal workpiece by the 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, the stripping after peeling, and the oil film and The substrate is deformed together, so the shot blasting and shot peening cannot completely remove the oil stain on the workpiece with oil stains. In the existing surface treatment method of the workpiece, the best cleaning effect is blast cleaning.
Sand blasting is suitable for cleaning surfaces with high surface requirements. However, the current general blasting equipment in China is composed of original bulky sand transporting machinery such as hinges, scrapers and bucket elevators. The user needs to build a deep pit and make a waterproof layer to install the machine. The construction cost is high, the maintenance workload and maintenance cost are great, and a large amount of dust can not be removed during the sand blasting process, which seriously affects the health of the operator and pollutes the environment. .
Shot peening is divided into general shot peening and stress shot peening. In general treatment, the steel plate is struck against the inside of the steel plate with a high-speed steel shot in a free state to cause pre-compression stress on the surface. In order to reduce the tensile stress on the surface of the steel plate during work, the service life is increased. Stress shot peening is to pre-bend the steel sheet under a certain force and then perform shot peening.
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In short, growth lights can provide important value in the agricultural and horticultural industry, such as light, spectrum and photoperiod control, increase yield and quality, save energy and expand planting range.
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