Selection of steel shot and steel grit and the difference between shot blasting, sand blasting and shot peening

Shot blasting is the use of compressed air as a driving force, the role of high-speed air flow from the compressed air, the steel shot blasting to the surface of the workpiece, the surface of the workpiece for cleaning or strengthening of a process.

 Shot blasting is generally a high-speed rotating impeller, the steel shot high-speed ejection, hit the surface of the workpiece, the surface of the workpiece for cleaning or strengthening of a process.

 Shot blasting and shot blasting are basically used in steel shot, steel shot is also divided into several kinds:

 First of all, the cast steel shot its hardness is generally 40 ~ 50HRC, processing hard metal, the hardness can be increased to 57 ~ 62HRC. cast steel shot toughness is better, the use of a wide range of its service life for the cast iron shot more than a few times.

 Now cast steel shot is also divided out of the low carbon bainite steel shot, this steel shot using a more advanced process to reduce the carbon content of the steel shot, making the steel shot more toughness, not easy to break.

 Steel wire cutting shot its hardness is generally 42~52HRC, depending on the hardness of the steel wire. Better toughness, low consumption. Generally used for shot blasting cleaning, initially angular, high cleaning efficiency.

 Steel wire cutting shot now also appeared grinding shot, grinding shot is in the steel wire cutting shot on the basis of improving the control of raw materials, steel wire drawing, grinding round, and further improve the efficiency and effectiveness of cleaning.

 As shot blasting is the use of nozzles to spray steel shot, so shot blasting cleaning has the following characteristics:

 (1) you can arbitrarily use metal or non-metallic projectiles to adapt to the different requirements of cleaning the surface of the workpiece;.

 (2) cleaning flexibility, easy to clean up the inner and outer surfaces of complex workpieces and pipe fittings of the inner wall, and is not subject to site constraints, the equipment can be placed in the vicinity of very large workpieces;.

 (3) The structure of the equipment is simple, less investment in the machine, less wearing parts, low maintenance costs; (4) It is necessary to clean the inner and outer surfaces of complex workpieces and the inner wall of pipe fittings.

 (4) must be equipped with high-power air compressor station, under the same conditions of cleaning effect, energy consumption.

 (5) clean up the surface is easy to have moisture, easy to rust again; (6) clean up the surface is easy to have moisture, easy to rust again.

 (6) low cleaning efficiency, high labor intensity.

 The characteristics of shot blasting cleaning or peening

 Shot blasting is realized by shot blasting machines, which are of the following types according to the size, shape and geometric characteristics of the workpiece to be processed:

 Hanger type, rotary table type, belt pass through type, rubber track type, hanger chain step type, hanger chain continuous type, etc.

 Sandblasting and shot blasting, the same as the use of compressed air as a driving force to form a high-speed jet beam will be sand (copper ore sand, quartz sand, emery, iron sand, Hainan sand) high-speed jet to the need to deal with the surface of the workpiece surface treatment process.

 Sandblasting to make changes in the surface state of the workpiece to obtain a certain degree of cleanliness and different roughness, so that the mechanical properties of the surface of the workpiece has been improved to increase the coating adhesion of the coating material to prolong the durability of the coating film is also conducive to the leveling of the paint and decorative, and sometimes chemical heat treatment to make the surface of the workpiece is a method of activation. Used in glass products, can be used for glass surface furring, or art carving. Many aluminum alloy surface cleaning, also use sandblasting process.