Structural Design Requirements for Aluminum Alloy Die Castings

（1）Shape and structure requirements of custom aluminium die casting:

a. Eliminate the internal side concave;

b. Avoid or reduce the core pulling part;

c. The reasonable die-casting structure can not only simplify the die casting structure, reduce the manufacturing cost, but also improve the casting quality,

（2）Wall thickness requirements of custom aluminium die casting design:

The wall thickness of die casting is a special factor in the process of die casting. The wall thickness is closely related to the whole process specification, such as the calculation of filling time, the selection of internal gate speed, the calculation of solidification time, the analysis of mould temperature gradient, the effect of pressure (final specific pressure), the length of mould retention time, the height of casting ejection temperature and operation efficiency.

（3）Requirements for design reinforcement of custom aluminium die casting:

The function of the rib is to improve the strength and rigidity of the parts after the wall thickness is thinner, to prevent the reduction of the shrinkage deformation of the custom aluminium die casting. And avoid deformation when the workpiece is ejected from the mould. The thickness of the custom aluminium die casting bar should be less than the thickness of the wall, generally 2 / 3 ~ 3 / 4 of the thickness;

（4）Fillet requirements of custom aluminium die casting design:

On the custom aluminium die casting, the connection between the wall and the wall, no matter the root of right angle, acute angle or obtuse angle, blind hole and groove, shall be designed as the round corner. Fillet connection is not used only when it is expected to be determined as the part of the parting surface, and the rest parts must be fillet generally. The fillet should not be too large or too small, too small customer aluminium die casting is easy to produces cracks. Too large is easy to produce porosity. Generally, the fillet of custom aluminium die casting is 1 / 2 of the wall thickness ≤ R ≤ the wall thickness; the function of the fillet is to help the metal flow, reduce eddy current or turbulence;

（5）Avoid the crack caused by stress concentration due to the presence of fillet on parts;

When the parts are to be electroplated or coated, the fillet can obtain a uniform coating to prevent deposition at sharp corners;

The utility model can prolong the service life of the die-casting mould, and can not cause the angle to collapse or crack due to the existence of the sharp angle of the mould cavity;

（6）Casting slope requirements of custom aluminium die casting design:

The inclination function is to reduce the friction between the casting and the mould cavity, to take out the custom aluminium die casting easily, to ensure that the surface of the custom aluminium die casting is not strained, and to extend the service life of the custom aluminium die casting mould.

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