The difference between shot blasting and sand blasting (II)

The difference between shot blasting and sand blasting (II)

In the article "A Detailed Introduction to the Differences between Shot Blasting and Sand Blasting (I)", Zhugnwei Precision Editor has introduced some differences between shot blasting and sand blasting in detail

Zhugnwei Precision Editor will introduce the differences between them.

Shot blasting is to use the motor to drive the impeller body to rotate. With the centrifugal force, the shot with a diameter of 0.2~3.0 (including cast shot, cut shot, stainless steel shot, etc.) is thrown to the surface of the workpiece to make the surface of the workpiece reach a certain roughness, making the workpiece beautiful, or changing the welding tensile stress of the workpiece to compressive stress, so as to improve the service life of the workpiece. Shot blasting is almost used in most fields of machinery, such as ship building, MIM, automobile parts, aircraft parts, gun tank surfaces, bridges, steel structures, glass, steel plates, pipes, etc. Sand blasting (shot blasting) is to use compressed air as power to spray sand with a diameter of 40~120 mesh or shot with a diameter of 0.1~2.0 to the surface of the workpiece, so that the workpiece can achieve the same effect. The treatment effect will be different if the size of pellets is different. Zhangnwei precision key points put forward that shot peening can also play a role in strengthening. Now the domestic equipment has entered a misunderstanding that only shot blasting can achieve the purpose of strengthening. The enterprises in the United States and Japan use shot blasting together for strengthening, and each has its own advantages. For example, for workpieces such as powder metallurgy micro gear and powder metallurgy small module gear, the shot blasting angle cannot be changed, and the initial speed can only be changed by frequency conversion. However, it has a large amount of treatment and fast speed, while shot peening is just the opposite. The effect of shot blasting is not as good as that of shot peening.

Sand blasting is a method of using compressed air to blow quartz sand out at high speed to clean the surface of parts. The metal powder injection molding factory is also called sand blowing. It can not only remove rust, but also remove oil, which is very useful for painting. It is commonly used for derusting the surface of parts; Surface modification of precision and complex parts (small wet sand blasting machines sold in the market are used for this purpose. The sand is usually corundum and the medium is water); In the steel structure, it is an advanced method to use high-strength bolts for connection. Because high-strength connection uses the friction between the joint surfaces to transmit force, the quality of the joint surface is required to be high. At this time, the joint surface must be treated with sand blasting.

Sand blasting is used for complex shape, easy to remove rust manually, with low efficiency, poor site environment and uneven rust removal. General sandblasting machines have sandblasting guns of various specifications, which can be put in and cleaned as long as the box is not too small.

Sand blasting is also one of the most common processes in surface processing of MIM technology products. One kind of precision machining of Zhugnwei is to use water as a carrier to drive the emery to process parts, which is sandblasting.

Both shot blasting and sand blasting can clean and decontaminate the workpiece, so as to prepare for the subsequent process, that is, to ensure the roughness requirements of the next process, or to ensure the consistency of the surface, shot blasting can strengthen the workpiece, so the sand blasting is not obvious. Generally, shot blasting is small steel ball and sand blasting is quartz sand. Number of items according to different requirements. Sand blasting and shot blasting are used almost every day in precision casting.

The above is a detailed introduction about the difference between shot blasting and sand blasting compiled by Zhangnwei Precision Group, and more about other polishing methods. Welcome to consult the MIM technical professional team of Zhangnwei Precision Metal Powder Injection Molding in Qinhuangdao!