As a common aluminum alloy product, cast aluminum parts are widely used in many fields such as automobile, aviation, construction and so on because of its excellent strength, good corrosion resistance and light weight. In the manufacturing process of cast aluminum parts, polishing is a very important part, which directly affects the appearance quality and durability of cast aluminum parts. In this paper, we will discuss the polishing of cast aluminum parts, introduce the polishing process, methods and precautions.

First, cast aluminum polishing process

1. Rough polishing: rough polishing is mainly to remove the cast aluminum surface oxide film, trachoma, bubbles and other defects, improve surface finish. Commonly used coarse polishing agents are chromium oxide, silicon carbide and so on. When polishing, the polishing agent needs to be evenly coated on the surface of aluminum parts, using appropriate pressure and speed for polishing.

2. Middle polishing: middle polishing is mainly to further remove the traces left by rough polishing, improve the surface finish. Commonly used in the polishing agent has aluminum oxide, zirconium oxide and so on. Polishing method is similar to rough polishing, but the pressure and speed is smaller.

3. Fine polishing: fine polishing is to obtain a higher surface finish and mirror effect. Commonly used fine polishing agents are diamond powder, cerium oxide and so on. Polishing, need to use less pressure and speed, to avoid scratches and damage.

Second, cast aluminum polishing methods

1. Hand polishing: hand polishing is suitable for small quantities, complex shape of cast aluminum parts. The operator needs to master certain skills to ensure that the polishing effect. The main tools for manual polishing are polishing wheel and polishing cloth.

2. Mechanical polishing: mechanical polishing is suitable for large quantities, the shape of simple cast aluminum parts. Common mechanical polishing equipment are polishing machine, polishing wheel and so on. Mechanical polishing can improve productivity and reduce labor intensity.

3. Chemical polishing: chemical polishing is through a chemical reaction to remove the oxide film and dirt on the surface of the cast aluminum parts, to improve the surface finish. Chemical polishing agent has acid, alkali, salt and so on. Chemical polishing is suitable for complex shapes, can not use mechanical polishing of cast aluminum parts.

Third, cast aluminum parts polishing notes

1. Selection of polishing agent: according to the material, shape and polishing requirements of cast aluminum parts, select the appropriate polishing agent. Different polishing agents on the corrosive cast aluminum parts, polishing effect and environmental protection are different.

2. Polishing pressure and speed control: polishing pressure and speed have a greater impact on the polishing effect. Too much or too little pressure and speed will lead to poor polishing. Operators need to adjust the pressure and speed according to the actual situation.

3. Good care of polishing equipment: polishing equipment is the key to ensure the polishing effect. Regular inspection, maintenance and replacement of polishing wheels and other equipment to ensure its normal operation.

4. Safety protection: polishing process, the operator needs to wear good protective equipment, such as gloves, masks, glasses, etc., to prevent the polishing agent on the body.

In short, cast aluminum polishing can not only improve the quality of appearance, but also enhance durability and extend service life. In the actual operation process, according to the material, shape and polishing requirements of cast aluminum parts, need to choose the appropriate polishing process and method, and pay attention to the choice of polishing agent, pressure and speed control, equipment maintenance and safety protection. Only in this way can we obtain the ideal polishing effect.