The main design idea of aluminum radiator profiles
is to reduce the impact on the cantilever in the process of metal extrusion by reasonable metal distribution supply and reasonable metal flow velocity regulation, improve the force state of the cantilever and achieve the purpose of improving the strength and stiffness of the cantilever. The practice proves that these methods are feasible and can be used for reference.
The extrusion die of high-density toothed aluminum radiator profiles is selected for the mold structure. Whether flat die or parting die structure, the stop structure should be designed. At the same time, no diversion cavity or welding chamber is designed on the mold or lower die in principle, so that the work can be brought into the mouth end by finishing or plane grinding. Ensure that the datum level of working tape is accurate, effectively avoid working tape error. The external diameter of the mould is based on the maximum external circle of aluminum radiator profiles. When the maximum external circle of the die hole is less than 120mm, the edge distance between the mould and the mould should not be less than 75mm. The larger the shape of the outer circle, the greater the distance.
In addition, the effective thickness of the baffle or upper die should not be too small, otherwise, under the condition of sufficient theoretical calculation strength, the shear pressure residual will be affected by the downward pressure of the metal, which will cause the cantilever to fracture. This thickness parameter, in principle, should not be less than 80 mm. Because of the long cantilever, large tooth ratio, many dangerous sections and large difference in wall thickness, this aluminum radiator profiles uses shunt mold structure and is not easy to be arranged. The metal directly impacts the cantilever root, and the metal first fills the root hole, so that the working belt of the root can be shorter and can be taken according to the multiple of the root wall thickness (0.5~1.0); Using cover type diversion protection die, diversion plate to protect the cantilever head, metal does not directly reach the cantilever root, improve the cantilever force situation, so that the head to the root torque, bending moment is reduced, thereby improving the strength of the die. The overall length of the cantilever (1/3~1/2) is appropriate, and the cantilever length of the baffle hood. To protect the guide die, the surface of the guide plate and the guide die should have a stop location.