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Compressed air is used to form a high-speed jet beam, and spray material (copper ore, quartz sand, iron sand, sea sand, corundum, etc.) is jetted at a high speed to the surface of the workpiece to be processed, so that the appearance of the workpiece surface changes due to the abrasive. Impact and cutting on the surface of the workpiece, so that the surface of the workpiece to obtain a certain degree of cleanliness and different roughness, so that the mechanical properties of the workpiece surface is improved, thus increasing the fatigue of the workpiece, increasing the between it and the coating Adhesion, prolongs the durability of the coating, and also contributes to the leveling and decoration of the coating
Working principle Due to the impact of abrasive on the workpiece surface and the cutting action, the surface of the workpiece gets a certain degree of cleanliness and different roughness, so that the mechanical properties of the workpiece surface are improved, thus improving the fatigue resistance of the workpiece and increasing it. Adhesion between the coating, extending the durability of the coating, is also conducive to the leveling and decoration of the coating, removing the surface impurities, noise and oxide layer, while roughening the surface of the medium, leaving the surface of the substrate surface Stress and the effect of increasing the surface hardness of the substrate.
The main application scope of sandblasting The surface treatment of the workpiece prior to the application of paint spray, paint before; spray before; metal spray before; galvanized, chromium, nickel before; oxidation treatment; before the flaw detection. Change the physical and mechanical properties of the workpiece to increase or decrease the surface roughness; change the surface tensile stress to compressive stress; increase the surface lubrication; reduce the movement noise of the coupling; increase the surface friction coefficient. Polishing of metal exterior finishes; obtaining matt or diffuse reflective surfaces; polishing wood surfaces.
(1) Before workpiece coating and workpiece bonding, sandblasting can remove all the dirt such as scale on the surface of the workpiece, and establish a very important basic pattern (the so-called rough surface) on the surface of the workpiece. Through the exchange of abrasives with different particle sizes, for example, the abrasives of the flying abrasive abrasives reach different degrees of roughness, which greatly improves the binding force between the workpiece and the coating and the plating material. Or make the adhesive bond more firm and better quality.
(2) Cleaning and polishing sandblasting of the matte surface of the casting and the heat-treated workpiece can clean up any dirt (such as oxide scale, oil stain, etc.) on the surface of the workpiece after heat treatment, and polish the workpiece surface to improve the finish of the workpiece. , Can make the workpiece exposed uniform metal color, so that the appearance of the workpiece is more beautiful and beautiful.
(3) The burr cleaning and surface beautification of the machined parts can clean up the tiny burrs on the surface of the workpiece and make the surface of the workpiece smoother, eliminating the danger of burrs and improving the grade of the workpiece. And sandblasting can make a small round at the interface of the workpiece surface, making the workpiece more beautiful and more precise.
(D) to improve the mechanical properties of the parts After the mechanical parts by sandblasting, the surface of the parts can produce uniform and fine concave and convex surface, so that the lubricating oil is stored, so that the lubrication conditions improve, and reduce noise and improve mechanical life.
(5) Polishing effect For some special-purpose workpieces, sandblasting can be used to achieve different reflective or matte finishes. Such as stainless steel workpieces, plastic grinding, polishing jade, wooden furniture surface matt, frosted glass surface pattern, as well as the fabric surface of the wool processing.
Sandblasting process
1 Sandblasting process pre-treatment stage The sandblasting process pre-treatment stage refers to the treatment of the workpiece surface before the workpiece is sprayed or sprayed with a protective layer. The quality of the sandblasting process before treatment affects the adhesion, appearance, moisture resistance and corrosion resistance of the coating. The pre-treatment work is not good, and the corrosion will continue to spread under the coating, causing the coating to fall off. After careful cleaning of the surface and the general simple cleaning of the workpiece, compared with the exposure coating, the life can be 4-5 times the difference. There are many methods for surface cleaning, but the most commonly accepted methods are: solvent cleaning, pickling, hand tools, and power tools.
2 sandblasting process sandblasting process is the use of compressed air as the power to form a high-speed jet beam, the spray material and other high-speed jet to the surface of the workpiece to be processed, so that the appearance of the workpiece surface changes, due to the impact of the abrasive on the workpiece surface and cutting effect The surface of the workpiece is given a certain degree of cleanliness and different roughness, so that the mechanical properties of the workpiece surface are improved.
Classification of sandblasting machines Sandblasting machines are the most widely used products in abrasive jets. Sandblasting machines are generally divided into dry sandblasting machines and liquid sandblasting machines. Dry sandblasting machines can also be classified into suction type and pressure type. Into two types.
Suction dry sandblasting machine Generally, a complete inhalation type dry sandblasting machine generally consists of six systems, namely a structural system, a medium power system, a pipeline system, a dust removal system, a control system, and an auxiliary system.
2. Working principle Inhalation dry sand blasting machine is powered by compressed air, and the negative pressure formed in the spray gun through the high-speed movement of air flow. The abrasive is passed through the sand conveying pipe.
The spray gun is sucked and ejected through the nozzle and sprayed onto the surface to be processed to achieve the desired processing target. In the suction type dry blasting machine, compressed air is available.
Press-in dry sand blaster Generally, a complete press-in dry sand blasting machine working unit is generally composed of four systems, namely a pressure tank, a medium power system, a pipeline system, and a control system.
2. Press-in dry sandblasting machine works.
Press-in type dry blasting machine is powered by compressed air, and the working pressure created by the compressed air in the pressure tank passes the abrasive through the sand outlet valve.
It is pressed into the sand delivery pipe and ejected through the nozzle. It is sprayed onto the machined surface to achieve the desired processing target. In press-in dry sand blasting, compressed air is used for both.
Matters needing attention when sandblasting work 1. Before the work, you must wear protective equipment and do not allow naked arms to work. There must be no less than two people at work.
2, gas tanks, pressure gauges, safety valves to regularly check. Gas tanks emit dust once in two weeks, and the filters in the tanks are checked once a month.
3, check the ventilation pipe and blasting machine door is sealed. Five minutes before the work, ventilation and dust removal equipment shall be activated. When the ventilation and dust removal equipment fails, the sand blasting machine is prohibited to work.
4. The compressed air valve should be opened slowly and the pressure should not exceed 0.8MPa.
5, sandblasting particle size should be compatible with the work requirements, generally apply between the 10th and the 20th, the sand should be kept dry.
6. When the sandblasting machine is working, it is forbidden to be approached by unrelated personnel. When cleaning and adjusting the operating position, it should be stopped.
7. Do not blow dust or joke with compressed air.
8. After the work is completed, the ventilation and dust removal equipment should continue to operate for five minutes before shutting off to remove indoor dust and keep the site clean.
9. Occurrence of personal and equipment accidents shall be maintained on site and reported to relevant departments.
Sandblasting machine knowledge
Sandblasting -