The working surface of the steel plate of the car we ride every day is reinforced with shot peening, which can significantly improve the fatigue strength of the material.
Shot blasting is to use the motor to drive the impeller body to rotate. By the action of centrifugal force, the ball with a diameter of 0.2-3.0 (with the cast pellet-cutting stainless steel shot, etc.) is thrown to the surface of the workpiece, so that the surface of the workpiece reaches a certain degree of roughness. Make the workpiece beautiful, or change the welding tensile stress of the workpiece to compressive stress, and improve the service life of the workpiece. It is used in almost all areas of machinery, repairing ships, auto parts, aircraft parts, guns, tank surface, bridge steel, glass-steel pipes, and so on. Sandblasting (pill) uses compressed air as a power to spray sand with a diameter of 40 to 120 mesh or a pellet of 0.1 to 2.0 to the surface of the workpiece, so that the workpiece achieves the same effect. The size of the pellets is different and the treatment effect is different. The key point is that peening can also play a reinforcing role. Nowadays, domestic equipment has entered a misunderstanding, and it is believed that only shot blasting can achieve the purpose of strengthening. The companies in the United States and Japan used to intensify the use of shot blasting! Each has its own advantages. For example, for a workpiece such as a gear, the angle of shot peening cannot be changed, and the initial speed can only be changed by frequency conversion. However, it handles a large amount and is fast, while shot peening is just the opposite. The effect of shot blasting is not as good as shot peening.
Sand blasting is a method of using compressed air to blow out quartz sand at high speed to clean the surface of the part. The factory is also called sand blowing, not only to rust, but also to remove oil, which is very useful for painting. Commonly used for surface derusting of parts; surface modification of parts (small wet sand blasting machine sold in the market is this use, sand is usually corundum, medium is water); in steel structure, the application of high-strength bolts is a relatively advanced The method is because the high-strength joint uses the friction between the joint surfaces to transmit the force, so the quality of the joint surface is very high, and the joint surface must be treated by sand blasting.
Sandblasting is used for complex shapes, easy to remove by hand, low efficiency, poor on-site environment, and uneven rust removal.
The general sand blasting machine has various types of sand blasting guns. As long as it is not a particularly small box, the gun can be put in and cleaned.
The supporting product of the pressure vessel—the head is sandblasted to remove the scale on the surface of the workpiece. The diameter of the quartz sand is 1.5mm~3.5mm.
One kind of processing is to use water as a carrier to drive the diamond to machine parts, which is a kind of sand blasting.
Both shot blasting and sandblasting can clean and decontaminate the workpiece. The purpose is to prepare for the next step, that is, to ensure the roughness requirements of the next process, and also for the consistency of the surface, the shot peening has on the workpiece. For reinforcement, sand blasting is not obvious. Generally, shot peening is a small steel ball, and sand blasting is quartz sand. According to different requirements, the number of sub-items.
Precision casting is used almost every day with sand blasting and shot blasting.
supplement:
1. Shot blasting and sandblasting are surface treatments, but it is not that only castings are shot.
2. The main functions of sand blasting are surface descaling, descaling, etc., such as heat-treated parts, and the effect and function of shot blasting are more: not only rust removal, but also surface roughness, surface roughness, removal of parts Machining burrs, eliminating internal stress in parts, reducing deformation of parts after heat treatment, improving wear resistance and pressure capacity of parts.
3. There are many processes for shot peening, such as castings, forgings, parts of parts after machining, and parts after heat treatment of parts.
4. Sandblasting is mainly manual operation, while shot blasting is automated and semi-automatic.
5. Steel shots and iron shots used in shot blasting are not really pills in the true sense. It is precisely a small steel wire or a small steel stick. It only looks like a meatball after a period of use. The so-called sandblasted sand To put it bluntly, it is just river sand. It is no different from the construction. It is only sieved with sandblasting, with less mud and particle size specifications. Of course, some industries are also different. For example, the shipbuilding industry uses real steel shots for shot blasting and metal ore (not river sand-quartz sand) for sandblasting. Pills are generally spherical and have no angular particles. Such as wire cutting pills, etc.; sand refers to angular sand, such as brown corundum, white corundum, river sand and so on.
6. Spray and throw
The spray is sprayed with compressed air as the power to spray the sand or pellet onto the surface of the material to achieve a clear and a certain roughness.
The throwing is a method of centrifugal force generated when the pellet is rotated at a high speed, impacting the surface of the material to achieve removal and a certain roughness.
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