Polishing method for zinc alloy die casting

Zinc alloy die-casting can remove serious cracks, bubbles, shrinkage holes and loose workpieces before polishing, and then polish and polish.

Polishing is mainly to remove the surface burrs, parting lines, flashing and other defects of the die casting of the workpiece to obtain a roughly flat and smooth surface. The cloth wheel is used for polishing. The diameter of the cloth wheel is 50-400mm. The large circumferential speed should not be greater than 2500m/min. Use a low speed of 1100-1400m/min for small parts. The adhesion force on the cloth wheel is 0.069~0.045mm, sharp angle should be used, iron oxide is the main polishing paste as the polishing auxiliary material, dry grinding is not allowed. Polishing should be carried out in one direction, the grinding marks should not be crossed, and the polishing pressure should not be too large to avoid excessive grinding.https://www.cncmachiningptj.com/copper-machining

Can polish the polished workpiece. The polished workpiece should reach Ra0.025~0.05μm. To polish, use cloth wheels, non-stick abrasives, first use rough polishing paste, and then use white polishing paste (alumina) for fine polishing. When polishing, use less polishing paste. In order to avoid the difficulty of degreasing due to excessive polishing paste.https://www.cncmachiningptj.com/titanium-machining However, if there is no polishing paste or there is too little polishing paste, the surface of the part will be overheated, pitting corrosion will occur, and bubbles will easily occur during the electroplating process. The polishing wheel speed should not be greater than 2150m/min, and the small pieces should be between 1100~1600m/min. When polishing, the pressure should not be too high. Pay attention to the amount of grinding. Polishing should be done in one direction, and scratches should not cross. After checking the polished parts, they should be placed in a special work piece to prevent scratches. Polished parts should be processed as soon as possible, otherwise the aged polishing paste will be difficult to handle.

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