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How to judge the quality of new energy automotive die castings
A die-casting mechanical die-casting machine for die-casting molds, in which a metal such as copper, zinc, aluminum or aluminum alloy heated to a liquid state is poured into a feed port of a die-casting machine, and die-cast by a die-casting machine to cast zinc of a shape and size limited by the die. Aluminum parts or aluminum alloy parts, such parts are usually called die-casting parts. Die-casting parts have different names in different places, such as die-casting parts, pressure casting parts, die-casting parts, die-casting aluminum, die-casting zinc, die-casting copper parts, copper. New die castings, aluminum alloy castings, aluminum alloy die casting parts, etc.
The quality of new energy automotive die castings includes appearance quality, quality and quality of use. Appearance quality refers to the surface roughness, surface quality, dimensional tolerance, shape tolerance and quality deviation of the casting. The internal quality refers to the chemical composition of the casting, physical. And mechanical properties, metallographic structure and pores, inclusions and cracks existing inside the casting; the quality of use means that the casting can meet various requirements and workability, wear resistance, corrosion resistance, and various machinability. Weldability, etc.
The control of the surface temperature of the die-casting mold is very important for the production of high-quality new energy automotive die-casting parts. Unevenly inappropriate mold temperature will also lead to unstable casting size, deformation of castings in the production and middle, resulting in thermal pressure, sticking, surface depression, shrinkage and thermal bubbles, etc. It has different effects on the variables in the production cycle, such as filling, cooling time and spraying time.
In order to produce an internal dense casting, it must be truly achieved when the pressure is timely. Otherwise, when the pressurization is up, the casting has already solidified, and the casting is not pressurized. Therefore, the pressure of the supercharging system is pressurized; the initial pressure of the supercharging pressure (ie, the pressure of the touch) is increasing; The starting time of the pressure should be adjusted organically. For example, the initial pressure of the supercharging pressure is too small, and the supercharging pressure is too small, which causes the casting to be poorly filled. There are many problems from the surface quality of the casting and the clarity of the contour. If the start of the pressurization is too late, the casting has already solidified, and the effect of pressurization is gone. Therefore, the start of the pressurization is also crucial. If the machine has a three-curve display, the adjustment can be viewed from the curve. If there is no curved display, the quality of the casting can be carefully observed to judge.