synonymSandblasting(The process of cleaning and roughening the substrate surface by using the impact of high-speed sand flow) Generally refers to sand blasting
Sand blasting is a kind of workpiecesurface treatmentTechnology.The compressed air is used as the power to form a high-speed jet beam to spray the material（Copper ore、Quartz sand、Emery、iron sand、Sea sand）High speed spray to the surface of the workpiece to be treated, which changes the appearance or shape of the workpiece surface.Due to the impact and cutting effect of abrasive on the surface of the workpiece, the surface of the workpiece can obtain a certain degree of cleanliness and different roughness, so that the mechanical properties of the surface of the workpiece can be improved, thus improving the fatigue resistance of the workpiece, increasing the adhesion between it and the coating, extending the durability of the coating, and also conducive to the leveling and decoration of the coating.
Sand blasting: technical term for gold and silver coin casting.That is to say, on the production mould of gold and silver coins, metal sand grains of different sizes and models are used to spray the pattern part into a very fine frosted surface. When gold and silver coins are produced, the pattern part appears a beautiful silver color, which increases the sense of three-dimensional and hierarchical.Sand blasting: (refers to metal surface rust removal or plating on metal surface)Ordinary quartz sand，Refined quartz sandHigh hardness, good derusting effect, physical and chemical indexes are as follows[1]
SiO2≥88—99.8% Fe2O3≤0.06—0.005%,The fire resistance is 1750 -- 1800 ℃, the appearance particles are uniform, the common particle sizes are 1-3MM and 0.1-0.3MM, pure white.The particle size range is mostly 5-220 mesh, which can be produced according to the user's requirements.Main applications: metallurgy, black silicon carbide, glass and glass products, enamel, cast steel, water filtration, foam alkali, chemical industry, sand blasting and other industries.The common packaging in sandblasting production is 25KG and 50KG[1]
Process characteristics
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1、 Sand blasting is the most thorough, universal, rapid and efficient cleaning method.[1]
2、 Sand blasting can be chosen arbitrarily between different roughness, which cannot be achieved by other processes.Manual polishing can produce rough surface but the speed is too slow, while chemical solvent cleaning is too smooth for coating bonding.[1]
Process classification
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Sand blasting machine
Sand blasting and shot blasting are collectively referred to as sand blasting. According to different sand blasting methods, there are four classification methods as follows:
1、 Pressure blasting and suction blasting.
2、 Dry sand blasting and liquid sand blasting.
3、 Open sandblasting and box (room) sandblasting.
4、 The above classification of manual sandblasting and automatic sandblasting is only relative, such as open sandblasting and box sandblasting. These two types may also be press in or suction sandblasting, dry sandblasting or liquid sandblasting, manual sandblasting or automatic sandblasting, and others are the same, with one exception: press in sandblasting is not liquid sandblasting, and vice versa.(Refer to the product catalog) Sometimes there is a concept, such as ×× special sandblasting equipment, but it is narrow, so it is not a classification method.[1]
Process application
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（1） Sand blasting for pretreatment of workpiece coating and workpiece bonding can remove all dirt on the surface of workpiece, such as rust scale, and establish a very important basic pattern (commonly called rough surface) on the surface of workpiece. In addition, it can achieve different degrees of roughness by changing abrasives with different particle sizes, greatly improving the adhesion between workpiece and coating and plating materials.Or make the bonding parts more firm and better quality.[1]
（2） Cleaning and polishing of rough surface of casting and forging, and workpiece after heat treatment. Sand blasting can clean all dirt (such as oxide skin, oil stain and other residues) on the surface of casting and forging and workpiece after heat treatment, and polish the surface of workpiece to improve the smoothness of workpiece, so that the workpiece can expose uniform metal color, make the appearance of workpiece more beautiful, and achieve the role of beautification and decoration.[1]
（3） Burr cleaning and surface beautification sandblasting of machined parts can clean the tiny burrs on the surface of the workpiece, make the surface of the workpiece more flat, eliminate the harm of burrs, and improve the grade of the workpiece.In addition, sandblasting can make a small round corner at the junction of the workpiece surface, making the workpiece more beautiful and precise.[1]
（4） Improve mechanical properties of parts After sandblasting, mechanical parts can produce even and fine concave and convex surfaces (basic schema) on the surface of parts, so that lubricating oil can be stored, thus improving lubrication conditions, reducing noise and improving mechanical service life.[1]
（5） Polishing function For some special purpose workpieces, sandblasting can achieve different reflections or matt at will.For example, the surface of stainless steel workpieces and wooden furniture is matt,Frosted glassThe pattern of the surface, and the texturing of the cloth surface.[1]
matters needing attention
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1. Wear protective equipment before work, and do not work with bare arms.At least two people shall work.2. The air receiver, pressure gauge and safety valve shall be calibrated regularly.Dust is discharged from the air tank once every two weeks, and the filter in the sand tank is checked once a month.3. Check whether the ventilation pipe and sandblasting machine door are sealed.Five minutes before work, the ventilation and dust removal equipment must be started. When the ventilation and dust removal equipment fails, the sandblasting machine is forbidden to work.4. The compressed air valve shall be opened slowly, and the air pressure shall not exceed 0.8MPa.5. The grit size of sand blasting shall be consistent with the work requirements, generally between No. 10 and No. 20, and the sand shall be kept dry.6. When the sandblasting machine is working, irrelevant personnel are prohibited from approaching.When cleaning and adjusting the running parts, the machine should be stopped.7. Do not use compressed air to blow dust on your body or make jokes.8. After the work is completed, the ventilation and dust removal equipment should continue to run for five minutes and then be closed to discharge indoor dust and keep the site clean.9. In case of personal and equipment accidents, keep the scene and report to relevant departments.[1]
