（1） The shape and structure requirements of die casting aluminum parts are as follows: A. eliminate the internal side concave; B. avoid or reduce the core pulling position; C. avoid the cross of core; reasonable die casting structure can not only simplify the structure of die casting mold, reduce the manufacturing cost, but also improve the quality of casting,
（2） Wall thickness requirements of die casting aluminum parts: the wall thickness of die casting parts (usually called wall thickness) is a special factor in the die casting process, and the wall thickness is closely related to the whole process specification, such as the calculation of filling time, the selection of gate speed, the calculation of solidification time, the analysis of die temperature gradient, the effect of pressure (final specific pressure), the length of mold retention time, and the casting Ejection temperature and operation efficiency.
（3） Requirements for design rib of die casting aluminum parts:
The function of the rib is to improve the strength and rigidity of the parts after the wall thickness is thinned, so as to prevent the shrinkage deformation of the die-casting aluminum parts, and to avoid the deformation of the workpiece when the workpiece is ejected from the mold. When filling, it is used to act as the auxiliary circuit (metal flow path). The thickness of the reinforcement of the die-casting aluminum part should be less than the thickness of the wall, generally 2 / 3 ~ 3 / 4 of the thickness of the die-casting aluminum part is taken;
（4） Requirements for fillet design of die casting aluminum parts:
All wall to wall connections on die casting aluminum parts, regardless of right angle, acute angle or obtuse angle, blind hole and root of groove, shall be designed as fillet. Fillet connection is not used only when it is expected to be determined as parting surface. Other parts generally must be fillet. Fillet should not be too large or too small. If it is too small, the die-casting aluminum parts are easy to crack, and if it is too large, it is easy to produce loose shrinkage cavity The angle is generally taken as: 1 / 2 wall thickness ≤ R ≤ wall thickness; the function of fillet is to help metal flow and reduce eddy current or turbulence; to avoid cracking caused by stress concentration due to the existence of fillet; when parts are to be electroplated or coated, the fillet can obtain uniform coating to prevent deposition at sharp corners; It can prolong the service life of the die casting die and prevent the corner collapse or cracking due to the existence of the die cavity sharp angle;
（5） Requirements for casting angle of die casting aluminum parts are as follows:
The function of inclination is to reduce the friction between the casting and the mold cavity, and to take out the die-casting aluminum parts easily; to ensure that the surface of the die-casting aluminum parts is not damaged; to prolong the service life of the die-casting aluminum parts, the minimum casting gradient of the die-casting aluminum parts is as follows: the minimum casting slope of the die-casting aluminum parts is 1 ° 1 ° 30 ′ 2 ° on the inner surface (single side).
