Causes and solutions of scratches and bumps on alu

The causes and solutions of scratches, scratches and bumps on the aluminum profile of heat sink

the aluminum profile of heat sink is widely used because of its good plasticity, moderate heat treatment strength, good welding performance and gorgeous color of the surface after anodic oxidation treatment. However, there are often some problems in the production process, which lead to the low quality of the aluminum profile of the heat sink, the reduction of the yield, the increase of production costs and the decline of benefits, resulting in the decline of the market competitiveness of the enterprise. Therefore, to solve the defect of aluminum profile of heat sink is that the fuel efficiency of Tianjin can be increased by 6% - 8%; Every 100kg reduction in vehicle mass is an important aspect to improve its competitiveness. Next, I will share the causes of scratches, scratches and bumps on the aluminum profile of the heat sink and their solutions

I. phenomenon: scratch, scratch and bruise are the surface damage of aluminum profile of heat sink when the profile flows out of the mold hole and contacts with tools and equipment in subsequent processes

II. Main reasons

1. There are bare metal or hard inclusions in the graphite strip on the discharge track or swing bed, which scratch the surface of the aluminum profile of the heat sink when it contacts with the profile

2. When the fork bar sends the profile from the discharge track to the swing bed, the profile is bruised due to too fast speed

3. Impurities or ingot composition segregation are attached to the ingot surface. When there are a large number of segregation floating objects on the surface of the ingot and the ingot is not homogenized or the homogenization treatment effect is not good, there are a certain number of hard metal particles in the ingot. When the metal flows through the working belt during the extrusion process, these segregation floating objects or hard metal particles adhere to the surface of the working belt or cause damage to the working belt, and finally cause scratch to the surface of the profile

4. There are sundries in the mold cavity or the working belt, and the hardness of the working belt of the mold is low, so that the surface of the working belt is injured during extrusion and the aluminum profile of the heat sink is scratched

5. During transportation, the experimenter should not put his hands or other objects under the hammer or puncture cone, and the aluminum profiles of the heat sink will be damaged by friction or extrusion between the profiles

III. solutions

1. Strengthen the control of ingot quality

2. Improve the quality of mold repair, and the mold production rate reaches 90% for nitriding, and strictly implement the nitriding process

3. Use soft felt to isolate the profile from the auxiliary equipment, and try to reduce the contact damage between the profile and the auxiliary equipment

4. Handle with care during production, and try to avoid dragging or turning the aluminum profile of the heat sink at will