Which is more suitable for sand blasting and shot blasting

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Update time : 2022-11-28 09:07:23
Castings are usually shot blasted or sandblasted, commonly known as shot blast and shot penning
Shot peening is efficient, but there will be dead corners, while sandblasting is more flexible, but the power consumption is large. Sand blasting uses high pressure wind as power, and shot blasting is usually high-speed rotating flywheel to throw out the steel sand at high speed. The surface quality of castings obtained by shot blasting is not as good as that of sand blasting, but it is more economical than sand blasting. And can remove some castings difficult to clean up the sticky sand, but not sandblasting.
The hardness of sandblasting is lower than that of shot peening, and the tools used are different.
Sandblasting shot peening is fundamentally the difference between the two kinds of injection media, of course, there are differences in the effect of sandblasting is more fine, easy to control the accuracy and flatness.
Shot peening is economical and practical, easy to control the efficiency and cost, you can control the diameter of the iron shot to control the injection effect. The two kinds of rust removal methods are different according to the needs of manufacturers, and the choice is different.
1. Shot blasting and sandblasting are surface treatments, but it does not mean that only castings are shot blasting.
2. The main function of sandblasting is surface rust removal, in addition to oxide skin, such as parts after heat treatment, and the role and function of shot blasting is more: not only rust removal, in addition to the surface oxide skin, but also improve the surface roughness, remove parts machining burr, eliminate the internal stress of parts, reduce the deformation of parts after heat treatment, improve the surface wear resistance, compression capacity, etc.
3. There are many processes for shot peening, such as castings, forgings, parts table after machining, parts table after heat treatment, etc.
4. Sandblasting is mainly manual operation, while shot blasting is more automatic and semi-automatic.
5. The steel shot and iron shot used is not in fact the real sense of the shot, it is accurate to say that it is a small steel wire or small steel rod, only after a period of time to look like balls, the so-called sandblasting sand through, that is, river sand, and construction is no different, just sandblasting through the sieve system, containing less mud, particle size specifications. Of course, there are also differences in some industries, such as the ship industry shot blasting with real steel shot, sandblasting with metal ore
1. Pellets and sand have different materials
Pellets are generally spherical particles without edges and corners. Such as steel wire shot, steel shot, etc.; Sand refers to angular sand grains, such as brown corundum, white corundum, river sand and so on.
2. Spraying and throwing work in different ways
Spraying is the compressed air as the power to spray sand or shot material to the surface of the material, to achieve clearance and a certain roughness.
Throwing is the method of centrifugal force generated when the pellet is rotated at high speed, impacting the surface of the material to achieve clearance and a certain roughness.
Shot blasting is a process in which metal particles are sprayed to the member in a closed space by a multi-angle and multi-point spray gun. The surface of the member can achieve a four-level effect of rust removal and oil removal. After the anti-corrosion coating of the surface roughness, the grip and retention time of the paint will achieve a very ideal effect.
Sandblasting generally has this effect, but the difference is that the materials used in sandblasting are mostly high hardness sand (such as quartz sand, etc.) or copper slag, and it is also manually completed, its speed is slower than that of shot blasting, and if the sand is used, the impact of sand and components in the process of sandblasting will produce some sand powder, which will not adhere to the component table And the surface roughness of sandblasting is lower than that of shot blasting.
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