The characteristics of metal casting are as follows.
(1) There is a higher dimension precision (it12~it16) and a smaller surface roughness (Ra6.3μm~12.5μm), the machining allowance is small.
(2) Because of the good heat conductivity of metal type, Metal Casting the cooling speed is fast, the grains of the castings are finer and the mechanical properties are good.
(3) can realize "one type multiple casts", raise labor productivity. Metal Casting and save molding materials, can reduce environmental pollution, improve working conditions.
However, the trade network points out that the manufacturing cost of metal mold is high, and it is not suitable to produce large and complex thin-walled castings. Because of the fast cooling speed, the surface of cast iron is easy to produce white mouth, which makes the machining difficult. The alloy with high melting point is not suitable for metal casting because of the limit of the melting point of the metal type material.
Metal casting is mainly used for mass production of non-ferrous castings such as copper alloy and aluminum alloy, such as piston, connecting rod, cylinder head, bushing, bushing, etc. Cast iron parts of the metal casting has also developed, but its size limit within the MM, Metal Casting the quality of not more than 8kg, such as the bottom of an electric iron.
Metal Casting Advantages:
1, metal type can be used many times, metal casting can reach tens of thousands of times without damage, so can save hours and a large number of modelling materials;
2, the metal processing precision is high, the cavity distortion is small, the cavity wall is bright and clean, therefore the casting shape is accurate, Metal Casting the dimensional precision is high, the surface roughness value is small;
3, metal type heat transfer rapidly, casting cooling speed, so small grains, good mechanical properties;
4, high productivity, no dust, Metal Casting working conditions have been improved.