What are pressure casting, what are the advantages and disadvantages?
Not only saves assembly time, but also saves metal.Die casting defectsAlthough there are many advantages of die casting, there are still some shortcomings to be solved. Such as:1) when die-casting, because liquid metal filling cavity speed is high, the flow pattern is unstable, therefore, using the general die-casting process, the casting easy to produce the blowhole, can not carry on the heat treatment;2) it is difficult to die casting with complex concave parts;3) high melting point alloys (such as copper, ferrous metals), die casting die life is low;4) it is not suitable for small batch production, the main reason is that the cost of die casting is high, the production efficiency of die casting machine is high, and the small batch production is uneconomical.
For example, at present, the minimum wall thickness of zinc alloy die castings can reach 0.3mm; the aluminum alloy castings can reach 0.5mm; the minimum casting hole diameter is 0.7mm; the minimum pitch is 0.75mm.High production efficiencyThe machine has high productivity, such as domestic J III 3 type horizontal cold air machine an average of eight hours can be 600 ~ 700 times of small die casting, hot chamber die casting machine every eight hours can be 3000~7000 times of die casting; long life, a pair of pressing mould, die casting bell alloy, life of up to hundreds of thousands of times, even millions of times easily; the realization of mechanization and automation.Good economic resultsDue to the precise size of the die castings, the surface is smooth and bright. General no longer machining and use directly or processing capacity is very small, so it improves the utilization rate of the metal, and reduce the processing equipment and a large number of working hours; the price of the casting is easy; can be used in combination with other casting metal or non-metal materials.
High pressure die casting pressure casting (the casting) is the essence of under high pressure, the liquid or semi liquid metal with high speed filling pressure casting (die casting) cavity, and forming under pressure and solidification and casting method.Compared with other casting methods, die casting has the following three advantages:Product quality is goodHigh dimension accuracy of castings, generally equivalent to 6~7, even up to 4; the surface finish, generally equivalent to 5~8; the hardness and strength of high strength than sand casting to improve 25~30%, but the elongation decreased about 70%; dimensional stability, good interchangeability; complex thin-walled castings can be cast.
