How does the aluminum extrusion heatsink made by hard tooling
Aluminum extrusion heatsink is a heat dissipation product obtained by cutting, grooving, drilling, tapping, CNC and other processing on the basis of aluminum profile. Aluminum extruded heatsink is generally made of al6063 material, with good thermal conductivity (160 ~ 180W / ㎡ · K) and relatively low cost. The aluminum extrusion process is to soften the aluminum bar at 480 ~ 530 degrees, and then extrudes through the extrusion tooling under the high pressure of the extruder to obtain a long aluminum profile with constant section.
1： Extrusion principle of aluminum profile
Extrusion is a plastic processing method that applies external force to the metal blank placed in the container (extrusion barrel) to make it flow out of the specific die hole to obtain the required section shape and size.
2： Composition of aluminum extruder
The extruder is composed of base, front column frame, tension column, extrusion cylinder and hydraulic system under electrical control. In addition, it is equipped with die base, thimble, scale plate, sliding plate, etc.
3： Classification of aluminum extrusion methods
According to the type of metal in the extrusion cylinder, stress-strain state, extrusion direction, lubrication state, extrusion temperature, extrusion speed, type or structure of tools and dies, shape or number of blanks, shape or number of products, it can be divided into forward extrusion method, reverse extrusion method (including plane deformation extrusion, axisymmetric deformation extrusion, general three-dimensional deformation extrusion) and lateral extrusion method, Glass lubrication extrusion method, hydrostatic extrusion method, continuous extrusion method, etc.
4： Forward hot deformation aluminum extrusion
The vast majority of hot deformation aluminum production enterprises use the forward hot deformation extrusion method to obtain the aluminum with the required section shape through specific molds (flat die, cone die and shunt die), which is the most aluminum production method adopted by Sinda Thermal so far!
Forward extrusion has the advantages of simple process flow, low equipment requirements, high metal deformation capacity, wide production range, strong controllability of aluminum performance, great production flexibility, and easy maintenance and correction of tools and dies.
The defect is that the friction between the inner surface of the extrusion cylinder and aluminum is strong, accounting for a large proportion of extrusion energy consumption. The friction is easy to heat the ingot in the cylinder, increase the instability of the profile, damage the improvement of the efficiency of the finished product, limit the extrusion speed of aluminum and aluminum alloy, accelerate the wear and service life of the extrusion die, and the front and rear of the product structure and performance table are uneven.
