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Radiator profiles extrusion technology

2020-08-10

Aluminum alloy because of light and beautiful, good thermal conductivity and easy processing into complex shapes, is widely used in the cooling equipment. There are three main types: aluminum alloy heat dissipation equipment wide flat shape, comb form or bones form; Round or oval round outside fin radiated; Dendrite. Their common features are: the short distance between the heat sink, a channel formed between two adjacent heat sink, its deep wide than large; Thin wall thickness difference is big, the general heat sink, and the roots of plate thickness. So to the thermal profile of the mold design, manufacturing and production of great difficulty.

Radiator profiles some of the smaller size, shape, symmetry of easy production, most of the radiator profiles wide flat shape, dimension is bigger, some asymmetric, deep trough width between the fin than large, its production is difficult. Need from ingot casting, mold, extrusion process, to produce the radiator profiles properly. Extruded alloy radiator profiles with must have the good extrudability and thermal conductivity, generally use one a30, 1035, and 6063 alloy, etc. Is more commonly used at present is 6063 alloy, because it besides good extrudability, thermal conductivity, and good mechanical properties.

Aluminum alloy radiator profiles production from the quality of ingot casting, mold material and the aspects of design, reduce the extrusion pressure and extrusion process.

1, the quality of ingot casting

Ingot casting alloy composition to strictly control the impurity content, to ensure that the alloy high purity. For 6063 alloy to control the content of Fe, Mg and Si. The Fe content should be less than 0.2%, the content of Mg and Si are general control in the lower limit of the national standard, Mg content 0.45% - 0.55%, Si content 0.25% - 0.35%. Go through full homogenization treatment, make the organization of the ingot and uniform performance.

Ingot surface is smooth, there is no segregation tumors or with sand and mud. Ingot end face should level off, can't cut into the steps or cut slope is too large (cut slope should be within 3 ㎜). Because the steps or cut slope is too large, with flat die extrusion cooling section, if there is no design guide 㭴, ingot mold, directly because of a ingot end face appeared in some places first contact with the mould, to produce stress concentration, the tooth profile of the die cut of the crowded break easily, or cause of discharging successively, prone to die blocked or extrusion.

2, the requirement of mould

For radiator profiles of the mold are many elongated teeth, to bear a lot of extrusion, each tooth should have high strength and toughness, if the performance has a great deal of difference between each other, and is easy to make poor strength and toughness of the tooth fracture. So the quality of the die steel must be reliable, it is best to use good quality of factory production of H13 steel, or quality of imported steel. Mold heat treatment is very important, should use vacuum quenching, had better use pure high pressure nitrogen quenching, can ensure uniform mold parts of the performance after quenching. Take three tempering after quenching, make mold hardness of guarantee under the premise of HRC48-52, enough toughness. This is one of the important conditions to prevent mold broken teeth.

Radiator profiles need to be able to smooth extrusion, the key to success is the mould design is reasonable, precise manufacturing. Generally avoid ingot extrusion directly to the die to work with you. For wide flat comb radiator profiles, design a on both sides of the smaller, larger diversion mode, make on both sides of the metal to flow, reduce the extrusion mould work wear, but also makes the uniform pressure distribution. The radiator section of wall thickness difference is big, mold design work to keep corresponding with the difference of them, namely the wall thickness of local work to increase, with can be big - 30 mm to 20 mm, and the position of the tooth to break through the conventional, bringing work to a minimum. All in all to ensure the uniformity of metal flow everywhere. For wide flat type radiator, in order to ensure the mold has a certain stiffness, the thickness of the mould to increase appropriately. Thickness increase about 30% - 60%. Mold production should also be very careful, air knife will be up and down, left and right sides, maintain symmetry, between the tooth and tooth machining error is less than 0.05 mm, machining error prone to a great teeth, namely the fin thickness uneven, even will produce the phenomenon of broken teeth.

For cross section design is mature, with Mosaic alloy steel die is also a good method, because of the alloy steel has good rigidity and wear resistance, not easy deformation, is advantageous to the forming of radiator profiles

 

3, reduce the extrusion pressure

In order to prevent mould broken teeth should minimize the extrusion, and extrusion deformation resistance and long, alloy ingot, the state of the ingot, the size of the deformation degree of size and other factors. Therefore extrusion cooling aluminum casting rods shoulds not be too long, about the normal casting rod length (0.6-0.85 times). Especially in the first stick of casting die and extrusion, in order to ensure to produce qualified products smoothly, had better use shorter casting rod, the length of the normal casting (0.4-0.6) times the die casting rods to try.

For complex shape of the cooling yell section, in addition to shorten the length of casting rod, also can consider to use pure aluminium short do first try squeezing casting, trying to squeeze again after successful extrusion production in normal ingot casting.

Ingot homogenizing annealing can not only make the uniform microstructure and mechanical properties, and can improve the performance and reduce the extrusion pressure extrusion, so must required ingot homogenizing annealing. As for the influence of deformation degree, due to the radiator profiles of sectional area is compared commonly big, extrusion coefficient is generally within 40, so its influence is small.

4, extrusion process

Radiator profiles extrusion die is the key to production of the first test, conditional word, can do simulation test on the computer first, see the mould design is reasonable, and then try on the extrusion machine mold. Test is very important for the first time, operator to make pressure on the main plunger in less than 8 mpa under low pressure slow progress, best someone to look after the mold exit with the torch light, such as extrusion die of each heat sink even after extrusion die, can squeeze pressure gradually accelerated. After the success of the test continue to squeeze the attention should be paid to control the extrusion speed, smooth operation. Production radiator profiles should be paid attention to when the heating temperature of the mold, to make the mould temperature and the temperature of ingot casting. If the temperature difference is too big, due to the pressure on the extrusion speed is slow, can make the metal temperature drop, easy blocking mode or velocity of uneven phenomenon.



5, last word radiator profiles extrusion technology in addition to the above factors, also extruder and the ability and level, the degree of automation of the back of the equipment, workers' skills and so on, different cooling section should take corresponding measures according to its characteristics, cannot treat as the same.

 

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