How to design a heat sink extrusion die reasonably?

How to design a heat sink extrusion die reasonably?

In recent years, with the wide application of radiators in IT, electrical appliances, automobiles and machinery, and other industrial products, the demand for radiators is also growing rapidly. In our country, the heat sink is mainly made of aluminum alloy extrusion molding, because the size of the extrusion blank has a good consistency, the production cycle is short, and the cost is relatively low. The comparison of radiator blanks manufactured by various processing methods is shown in Table 1. There are many shapes of aluminum alloy radiators, but they have common characteristics: the distance between the fins is short, a groove is formed between two adjacent fins, and the ratio of depth to width is large, followed by a large difference in wall thickness. Generally, the heat sink is thin, but the thickness of the bottom plate at its root is large, so it brings great difficulty to mold design, manufacture, and production of the heat dissipation profile.

The gap between the teeth of the radiator is much smaller than that of ordinary profiles, and it has a large cantilever, so it is very easy to have partial teeth and broken teeth during extrusion, resulting in the scrapping of the mold. Therefore, when selecting mold materials, there are extremely high requirements for the hardness, strength, toughness, hardenability, thermal fatigue resistance, and wear resistance of the material. At present, the most widely used steel is H13 steel, which is an air-cooled and hardened hot work die steel, which is an ultra-high-strength steel. It has good hardness, heat strength, wear resistance, plasticity, and high impact toughness, resistance to cold and heat fatigue, small heat treatment deformation, good resistance to crack expansion, and good surface roughness of extruded profiles. The mold is labor-saving, has a long service life, the price is low and the supply is sufficient. It is the preferred mold material. The mold must be nitrided evenly during heat treatment to ensure the performance of each part is consistent, so as to better prevent the mold from breaking teeth and improve the life of the mold.

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