Because the mold of radiator aluminum profile is many slender teeth, to withstand a lot of extrusion pressure, each tooth should have high strength and toughness, if there is a great difference between the performance of each other, it is easy to make the strength or toughness of those teeth fracture. Therefore, the quality of die steel must be reliable. It is best to use H13 steel produced by reliable manufacturers, or choose high-quality imported steel. The heat treatment of the die is very important, to use vacuum heating quenching, it is best to use high pressure pure nitrogen quenching, can ensure the uniform performance of each part of the die after quenching. After quenching, three times of tempering should be taken to ensure that the hardness of the die is HRC48 ~ 52 and has enough toughness. This is an important condition to prevent mold tooth breakage.
Radiator aluminium profile
In order to successfully extrude the radiator aluminum profile, the key is that the mold design should be reasonable and the manufacturing should be accurate. Generally try to avoid direct extrusion of ingot onto the die strip. For the flat and wide comb radiator profile, design a small in the middle, large on both sides of the diversion die, so that the metal flow to both sides, reduce the extrusion pressure on the die working belt, and make its pressure distribution uniform. Because the wall thickness difference of the radiator profile section is large, the design of the mold working belt should keep their differences accordingly, that is, the working belt where the wall thickness is large should be especially increased, which can be as large as 20mm ~ 30mm, and the position of the tooth tip should break through the routine and reduce the working belt to a minimum. Make sure the metal flows evenly everywhere. For the flat and wide radiator, in order to ensure that the mold has a certain stiffness, the thickness of the mold should be increased appropriately. Thickness increase about 30% ~ 60%. The production of the mold should also be very fine, the empty knife should be symmetrical up and down, around and in the middle, the processing error between the teeth is less than 0.05mm, the processing error is easy to produce bias, that is, the thickness of the heat sink is not uniform, and even the phenomenon of broken teeth.
For the design of more mature section, the Mosaic alloy steel die is also a better method, because the alloy steel die has better rigidity and wear resistance, is not easy to deformation, is conducive to the forming of the radiator profile.
