Aluminum alloys are widely used in heat dissipating equipment due to their light and beautiful appearance, good thermal conductivity and easy processing to form complex shapes. The design, manufacture and production of aluminum alloy radiator profiles are very difficult.
1. ingot quality requirements
The alloy composition of the ingot must be strictly controlled to ensure the purity of the alloy. The ingot must be homogenized to make the ingot’s microstructure and properties uniform. The surface of the ingots should be smooth, and there is no segregation or slime. The end face of the ingot must be smooth, not cut into a step shape or the cutting slope is too large (the slope should be less than 3mm).
Because the step shape or cutting slope is too large, when the plane die is used to squeeze the heat dissipated profile, if there is no design diversion, the ingot is directly touched by the mold. Because the ingot end face is not flat, the mold is first touched in some places, and the stress concentration is produced. It is easy to squeeze the tooth shape of the mould, or cause the different succor of the material. The phenomenon of extrusion molding is not good.
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2. requirements for the mold
The heat treatment of the mould is very important. It is necessary to use vacuum heating to quenching. It is best to use high pressure pure nitrogen quenching to ensure that all parts of the die after quenching are homogeneous in performance. After quenching, three tempering is required, so that the hardness of the mould is guaranteed to have enough toughness under the premise of HRC48-52. This is an important condition to prevent the die from breaking.
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3. pressure requirements
In order to prevent the die breaking from the extrusion pressure, the extrusion pressure is related to the length of the ingot, the size of the alloy deformation resistance, the state of the ingot, the size of the deformation degree, and so on. Therefore, the extrusion of the cast rod of the aluminum profile should not be too long, which is about (0.6-0.85 times) of the length of the normal casting bar.
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4. Requirements for extrusion process
The key to the production of the profile of the radiator is the first test die of the extrusion die. If there are conditions, the simulation test can be done on the computer to see whether the working belt of the mold design is reasonable, and then the die is tested on the extruder. The first test model is very important, the manipulator should let the main plunger forward and press down under the low pressure of lower than 8MPa. It is best to use the light beam to look after the die outlet. When the die is successfully pressed, the extrusion speed should be controlled so as to achieve smooth operation. When producing radiator profiles, attention should be paid to the heating temperature of the mould, and the mold temperature should be similar to the temperature of the ingot. If the temperature difference is too large, the temperature of the metal will be reduced due to the slow extrusion speed when the upper pressure is pressed.
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In addition to the above factors, the extrusion technology of the profile of the radiator is related to the ability and level of the extruder, the automation of the rear equipment, and the working skills of the workers. The different section of the heat dissipating section should take corresponding measures according to its characteristics, and it can not be generalized. Dongguan Chicco Industrial Co., Ltd., specializing in the processing of aluminum automotive power amplifier radiator, aluminum profile home sound radiator and aluminum LED radiator mainly, also camp CNC processing, all kinds of aluminum and hardware accessories manufacturing.
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