In the extrusion production process of heat sink aluminum profile
s, common defects include bending, twisting, deformation and slag inclusion. The defects of adsorbed particles are difficult to find without careful observation or contact. The harm is: in the production process of electrophoresis and spraying profiles, it is difficult to remove them, 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 the quality of the cast rod The quality of the cast rod is an important factor affecting the surface of the aluminum profile and the extrusion molding of the heat sink. The cause of the 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 cast rod defects have one thing in common, that is, they are not well welded to the base of the cast rod, causing the flow of the base to become unstable. Continuity, which is an important factor in the formation of adsorbed particles. Second, the influence of the 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 being pressed, 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 of the 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 adsorption of particles. Third, the influence of extrusion process The correct choice of extrusion process parameters is also an important factor affecting the adsorption of particles. If the extrusion temperature is too high and the extrusion speed is too fast, the more particles will be adsorbed. The reason is that due to the high temperature and high speed, the flow speed 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 the phenomenon of sticking aluminum. 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, we can continuously analyze problems and summarize experience Reduce or avoid adsorption of particles, greatly improving the yield and production efficiency of the aluminum profile of the heat sink.
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