The quality requirements of the ingot include strict control of impurity content in the alloy composition of the ingot to ensure the purity of the alloy melt. For 6063 alloy, the content of Fe, Mg, and Si should be controlled. The content of Fe should be less than 0.2%, and the content of Mg and Si should generally be controlled within the lower limit of national standards, with Mg content ranging from 0.45% to 0.55% and Si content ranging from 0.25% to 0.35%. The ingot needs to undergo sufficient homogenization treatment to ensure a uniform and consistent structure and properties of the ingot.

The surface of the ingot should be smooth, and there should be no segregation or sticking of sand or mud. The end face of the ingot should be flat and cannot be cut into a stepped shape or with a large cutting angle (the cutting angle should be within 3mm). Due to the large step shape or cutting slope, when using a flat die to extrude heat dissipation profiles, if there is no design of a flow guide, the ingot will directly contact the mold. Due to the uneven end face of the ingot, some parts of the aluminum profile manufacturer may first contact the mold, causing stress concentration, which can easily break the tooth shape of the mold or cause different discharge sequences, leading to mold blockage or poor extrusion molding.

The requirement for molds is that the molds for radiator profiles are made of many slender teeth that need to withstand significant extrusion pressure. Each tooth must have high strength and toughness. If there is a significant difference in performance between them, it is easy to cause the teeth with poor strength or toughness to fracture. Therefore, the quality of mold steel must be reliable, using H13 steel produced by reliable manufacturers or imported steel selected. The heat treatment of the mold is very important. Vacuum heating quenching and high-pressure pure nitrogen quenching can ensure uniform performance of all parts of the mold after quenching. After quenching, three tempering steps should be taken to ensure that the hardness of the mold is within the range of HRC48-52 and has sufficient toughness. This is an important condition to prevent mold tooth breakage.

The key to successful extrusion of radiator profiles is to have a reasonable mold design and a good manufacturing process for aluminum profiles. Generally, try to avoid direct extrusion of the ingot onto the mold working strip. For the flat and wide comb shaped radiator profile, the aluminum profile is designed with a small center and large side guide mold to allow the metal to flow towards both sides, reduce the extrusion pressure on the working strip of the mold, and ensure uniform pressure distribution. Due to the large wall thickness difference in the cross-section of the radiator profile, it is necessary to maintain their differences when designing the mold work strip. That is, the work strip should be specially increased in areas with large wall thickness, which can be as large as 20mm~30mm. The position of the tooth tip should break through the convention and reduce the work strip to a small size. In short, it is necessary to ensure the uniformity of metal flow in various places. For flat and wide radiators, to ensure a certain degree of stiffness in the mold, the thickness of the mold should be appropriately increased. The increase in thickness is about 30-60%. The production of the mold should also be very precise, and the empty cutter should maintain symmetry in the top, bottom, left, right, and middle. The machining error between teeth should be less than 0.05mm. Large machining errors in aluminum profiles are prone to tooth deviation, which means that the thickness of the heat sink is uneven, and even tooth breakage may occur.