Application of Shot Blasting Process on Surface Treatment of Clip Raw Material
The raw materials were cleaned by different shot blasting processes with different pellet and different currents.The surface morphology,roughness and cleaning grade of the raw materials after shot blasting were analyzed,and the raw materials after different shot blasting processes were produced into clips,and their fatigue properties were compared.The results show that the surface appearance and roughness of the raw material cleaned by casting steel shot are better than that by cutting steel wire shot.With the increase of shot blasting current,the surface roughness of raw material increases gradually when the pellet and conveying speed are the same.Different shot blasting processes can clean the surface of raw materials.When the pellet is the same,with the increase of shot blasting current,the surface cleaning level of raw materials is improved after shot blasting,and the oxide sheet dropped in the subsequent production process is reduced.The cleaning effect of the cast steel shot is better than that of the steel wire cut shot on the whole,so the elastic strip made of the raw material of the cast steel shot cleaning has better fatigue resistance.Before shot blasting of raw materials,it is necessary to select reasonable pellet.On the basis of considering the loss,the pellet with rounded surface and regular shape should be selected as far as possible to avoid forming defects such as pits with sharp edges and corners on the surface of raw materials,which will affect the fatigue life of the clips.
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