Powder metallurgy products have been widely used in many fields due to their unique advantages, such as near-net-shape manufacturing, high material utilization, and the ability to manufacture complex components. However, since the surface quality of powder metallurgy products directly affects their usability and decorative effect, mechanical Polishing methods occupy an important position in the post-processing of powder metallurgy products. This paper will focus on the mechanical polishing method of powder metallurgy products.

First, the surface quality requirements of powder metallurgy products

The surface quality requirements of powder metallurgy products mainly depend on their Application areas. Generally speaking, the surface finish, flatness, no obvious depression, no cracks, etc. are the basic requirements. For some special applications, such as bearings, gears, etc., the surface of the product is also required to have a specific texture or pattern to improve its performance.

Second, the principle of mechanical polishing method

Mechanical polishing method is to use the friction between the abrasive and the surface of the powder metallurgy products to remove the microscopic unevenness of the surface of the products, so as to improve its surface finish. During the polishing process, the abrasive tool applies a certain pressure and speed to the surface of the product, so that the abrasive grains on the abrasive tool and the surface of the product produce friction, removing a layer of microscopic unevenness on the surface. By repeating this process, the surface of the product gradually achieve the effect of flat and smooth.

Third, the choice of mechanical polishing methods

According to the material, shape, size and surface quality requirements of powder metallurgy products, it is important to choose the appropriate mechanical polishing method. Common mechanical polishing methods are manual polishing, semi-automatic polishing and automatic polishing.

1. Manual polishing: suitable for small batch, diversified, complex shape of the powder metallurgy products. Manual polishing can be flexibly adjusted according to the specific requirements of the products, polishing pressure, speed and polishing path, so as to achieve the ideal surface quality.

2. Semi-automatic polishing: It is suitable for powder metallurgy products with medium batch and regular shape. Semi-automatic polishing usually use special equipment, with a certain degree of automation, can improve the polishing efficiency.

3. Full-automatic polishing: applicable to large quantities of powder metallurgy products with uniform shape and high surface quality requirements. Fully automatic polishing using a high degree of automation equipment, with high polishing efficiency and stability, but the equipment investment costs are higher.

Fourth, the attention of the mechanical polishing process

In order to ensure the surface quality of powder metallurgy products, the following points need to be noted in the mechanical polishing process:

1. Selection of suitable abrasives: According to the material and surface quality requirements of the products, select the appropriate abrasives. Generally speaking, higher hardness abrasives are suitable for hard materials, while lower hardness abrasives are suitable for soft materials.

2. Choose the right abrasive: the hardness, grain size and shape of the abrasive have a great influence on the polishing effect. According to the material of the product and surface quality requirements, choose the right abrasive.

3. control the polishing pressure and speed: polishing pressure and speed will affect the degree of friction between the abrasive and the surface of the product, thus affecting the polishing effect. Should be based on the specific requirements of the product, reasonable control of polishing pressure and speed. 4.

4. Keep the Polishing fluid clean: impurities in the polishing fluid will affect the polishing effect, and may even lead to product surface damage. Therefore, the polishing fluid should be replaced or cleaned in a timely manner. 5.

5. Regular inspection and maintenance of equipment: in order to ensure that the polishing effect and stable operation of equipment, should be regularly checked and maintained polishing equipment.

In short, the mechanical polishing method of powder metallurgy products is the key technology to improve its surface quality. By reasonably selecting the polishing method and process parameters, the surface finish and aesthetics of powder metallurgy products can be effectively improved to meet their application needs in different fields.