Reasons for the formation of adsorbed particles during the extrusion of Industrial Aluminum Profiles

Reasons for the formation of adsorbed particles during the extrusion of Industrial Aluminum Profiles

Oct 15 2020

In the extrusion production process of the industrial aluminum profiles of the heat sink industry, common defects include bending, twisting, deformation, and slag inclusion. The defects of "adsorbed particles" are difficult to find without careful observation or contact. The hazard is that it is difficult to remove in the production process of electrophoresis and spraying profiles, which affects the appearance of the profiles and causes waste products. The main reasons for the formation of "adsorbed particles" are as follows:

1. The influence of casting rod quality

The quality of the cast rod is an important factor affecting the surface and extrusion of the aluminum profile of the heat sink. The cause of "adsorbed particles" has a lot to do with the quality of the cast rod. The common structural defects of cast rods include slag inclusion, porosity, coarse grains, segregation, bright grains, etc. All these casting rod defects have one thing in common, that is, they are not well welded to the base of the cast rod, resulting in the flow of the base Continuity, which is an important factor in the formation of "adsorbed particles".

2.the impact of mold

In extrusion production, the mold is working under high temperature and high pressure, which will produce elastic deformation. The working belt of the die starts to be parallel to the extrusion direction. After receiving pressure, the working belt deforms into a horn shape. Only the cutting edge of the working belt touches the sticky aluminum formed by the aluminum profile of the heat sink, which is similar to the cutting edge of a turning tool. During the formation process of sticky aluminum, particles are continuously carried out by the aluminum profile of the heat sink and adhere to the surface of the profile, resulting in "adsorbed particles".

3. The influence of extrusion process

The correct selection of extrusion process parameters is also an important factor affecting "adsorbed particles". If the extrusion temperature is too high and the extrusion speed is too fast, the more "adsorbed particles" will be. The reason is that due to the high temperature and fast speed, the flow rate of the profile increases, the degree of mold deformation increases, the flow of metal is accelerated, and the deformation resistance of the metal is relatively Weakened, it is easier to form aluminum sticking phenomenon.

The influencing factors of "adsorbed particles" are mainly cast rods, molds, and extrusion processes. The operating level of the operators is also reflected in these three elements. On the basis of production practice, they continue to analyze problems and summarize experience. It can reduce or avoid "adsorption particles", thereby greatly improving the yield and production efficiency of industrial aluminum profiles for heat sinks.