Effect of shot peening on surface roughness of workpiece

In production practice, in order to obtain a better shot peening surface, we should start from the following aspects: to provide a better original surface, Ra value should be less than 6.3mm; Select reasonable shot diameter and shot peening pressure; After the shot peening of large diameter steel shot, the low pressure of small steel shot (without changing the shot peening strength value) is used to cover once, and the better surface roughness can be achieved. The surface of the parts after shot peening should be slightly polished, and the amount of metal removal on the surface should be controlled when grinding. In this way, the strengthening effect of shot peening is not damaged, and the surface roughness can be improved.
      The reinforced shot peening of steel shot will cause the plastic deformation of the surface of the parts, and the surface roughness of the parts will change. Surface roughness is a kind of microscopic geometry error, also known as microscopic irregularity. Surface roughness, like surface waviness and shape error, belong to the geometric shape error of parts, and surface roughness has an important impact on the performance of machine parts.
       The effect of shot peening on the surface roughness of the material is usually in the range of Ra0.6 ~ 20mm. Under the condition that the process parameters are not changed, the higher the original surface roughness of the material, the higher the Ra value after shot peening. Production practice has proved that, in general, shot peening can improve or maintain the original surface roughness when the surface roughness is below 6.3mm before shot peening. If the original surface roughness is above 6.3mm, the surface roughness after shot peening is somewhat reduced. Dafeng YuCHAO MACHINERY CO., Ltd. is a professional metal abrasive manufacturing enterprise, with an annual output of 300,000 tons of various specifications of cast steel shot, cast steel sand, alloy steel shot, high carbon steel shot, stainless steel shot, reinforced steel shot, wire cut shot and other qualified metal abrasive. Products sell well all over the country, products are widely used in casting, shipbuilding, machinery, automobiles, locomotives, steel structure, container, national defense, nuclear industry, wind power, steel pipe, stone and other aspects. By the majority of users trust, is China's production specifications of the most complete metal abrasive supplier.