Because magnesium alloys are extremely active, there is often a layer of
oxide on the surface. Therefore, the surface treatment of magnesium alloys has
certain difficulties. It is necessary to adopt special treatment methods. The
appearance treatment of magnesium alloy is mainly to improve the appearance of
Magnesium Die Casting Parts and to improve the wear resistance and
anti-corrosion functions. Its functions include the following:
Die Casting Mould Components
(A) Decorative appearance;
(B) Improve wear resistance
(C) Adding and retouching the small holes of die-casting parts;
(D) Form a protective layer to prevent the magnesium alloy from being exposed to the air;
(E) The adhesion between the added magnesium alloy substrate and the organic coating;
(F) Insulate the magnesium alloy from contact with other metals to avoid electrochemical corrosion.
Unreasonable die casting structure often produces unpredictable defects. These are all things that Die Casting Parts Supplier doesn't want to see, so it is very necessary to design a good casting structure. However, each type of die casting process often has different structural requirements and different wall thickness requirements. Another factor is the ease of demolding (to facilitate production) to be designed.
1. The wall thickness should not be less than the minimum wall thickness
Under certain casting conditions, the minimum wall thickness of the casting alloy that can fill the mold is called the minimum wall thickness of the casting alloy. In order to avoid defects such as insufficient casting and cold insulation of the casting, the design wall thickness of the casting should be not less than the minimum wall thickness.
2. Thickness of inner wall of casting
During sand casting, the inner wall of the casting has poor heat dissipation conditions. Even if the thickness of the inner wall is equal to the thickness of the outer wall, the mechanical properties are often lower than the outer wall due to its slower solidification speed than the outer wall. At the same time, it is easy to generate heat at the junction of the inner and outer walls during the casting Stress causes cracks in the casting. For casting alloys with large solidification shrinkage, shrinkage holes and shrinkage are also easy to occur, so the inner wall thickness of the casting should be thinner than the outer wall thickness.
3. The casting wall should be connected reasonably
The uneven thickness of the castings and the large difference between the thickness and the thickness will cause heat concentration and uneven cooling, which is not only prone to shrinkage and shrinkage, but also easy to produce stress, deformation and cracks. Therefore, it is required that the wall thickness of the casting is as uniform as possible. If it is not uniform, it is easy to form shrinkage holes in the thick part, and cracks are easily formed in the thick and thin connection. The arrangement of reinforcement ribs should try to avoid or reduce crossovers, to prevent the habit from becoming a hot festival.
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