Before mechanical polishing of lead die casting, the quality of die casting should be inspected first. Inappropriate mold design and casting technology will lead to defects in the surface layer, such as cracks, subcutaneous bubbles, pores, cracks and other defects, which are potential corrosion sources and one of the main factors affecting the coating quality. The quality of die casting is unqualified, so it is forbidden to enter the polishing process. The surface of China Lead Die Casting should be bright, clean, compact and flat, free of cold lines and air holes.

When polishing, attention should be paid to the characteristics of fine surface and loose internal structure of lead die casting. If the loose layer is exposed by throwing away the dense layer on the surface, the phenomenon of more polishing and hairiness will appear, which will seriously affect the adhesion of the electroplating layer. If the surface of the workpiece is rough, it is advisable to use a grinding wheel with a lower rotating speed and a smaller diameter. Never use too much force during operation, and do not throw away the dense layer on the surface. When polishing cloth wheel, we should choose the appropriate rotating speed, throwing wheel material and throwing wheel diameter. If the rotating speed is too fast, the force is too hard, and there is no polishing paste on the throwing wheel, fine pits and wrinkles will be formed on the surface of the parts, which will not only affect the decoration, but also cause blistering and peeling. Pay attention to handle with care during operation. Electroplate polished parts as soon as possible. If they are left for too long, the appearance and adhesion of the coating will be affected.

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