The design of the die casting must consider seven aspects: the wall thickness of the die casting, the casting fillet the angle of demoulding, the stiffener, the small distance between the hole the edge of the die casting, the rectangular hole groove on the die casting, the insert in the die casting the surplus of the die casting.
1. Code for design of casting fillet
Generally, all parts of the die casting should have round corners (except the parting surface), which can make the metal flow smoothly when filling, the gas can be easily discharged, avoid cracks due to sharp angles. For the die-casting parts that need to be electroplated painted, the fillet can be evenly coated to prevent coating accumulation at the sharp corners. Generally, the fillet radius r of die casting should be less than 1mm, the small fillet radius is 0.5mm.
2. Code for design of inserts in die casting
First of all, the number of inserts on the die casting should be too much; second, the connection between the insert the die casting must be firm, at the same time, it is required to slot, bulge, knurling, etc. on the insert; third, the insert must avoid sharp corners to facilitate placement prevent stress concentration of the casting. If there is serious electrochemical corrosion between the casting the insert, the surface of the insert needs to be protected by coating; casting with the insert Heat treatment shall be avoided to avoid volume change caused by phase transformation of two metals loosening of inserts.
3. Design code for wall thickness of die casting
Thin wall die casting has higher strength better compactness than thick wall die casting. In view of this, the design of die casting should follow the principle that the wall thickness should be reduced as much as possible the uniformity of wall thickness should be maintained on the premise of ensuring that the casting has sufficient strength rigidity.
It has been proved that 2.5-4mm is suitable for the design of the wall thickness of die-casting parts, the parts with wall thickness more than 6mm should be produced by die-casting process. The effects of too thick too thin wall on the quality of the casting: if the wall of the casting is too thin in the design, it will lead to poor metal fusion, directly affect the strength of the casting, cause difficulties in molding; when the wall is too thick seriously uneven, it is easy to produce shrinkage cracks; on the other hand, with the increase of the wall thickness, the defects such as porosity porosity in the casting will increase, as well It will reduce the casting strength affect the casting quality.