Requirements in die-casting aluminum processing

Zhejiang Qihong Machinery Casting Co., Ltd. Tell you the requirements in die-casting aluminum processing

(1) Shape and structure requirements of die-casting aluminum parts:

a. Eliminate internal undercuts;

b. Avoid or reduce core pulling parts;

c. Avoid crossover of cores; reasonable die casting structure can not only simplify the structure of die casting mold, reduce manufacturing cost, but also improve the quality of casting

(2) Wall thickness requirements for the design of die-cast aluminum parts:

The wall thickness of the die-casting part (commonly referred to as wall thickness) is a factor of special significance in the die-casting process. The wall thickness is closely related to the entire process specification, such as the calculation of the filling time, the selection of the gate speed, the calculation of the solidification time, the mold The analysis of temperature gradient, the effect of pressure (final specific pressure), the length of mold retention time, the level of the ejection temperature of the casting and the operating efficiency.

(3) Requirements for design ribs of die-cast aluminum parts:

The role of the ribs is to improve the strength and rigidity of the parts after the wall thickness is thinned, to prevent the shrinkage and deformation of the die-cast aluminum parts, and to prevent the workpiece from being deformed when ejected from the mold. Access), the thickness of the die-cast aluminum ribs should be less than the thickness of the wall, generally take 2/3 ~ 3/4 of the thickness of the place;

(4) Fillet requirements for die-cast aluminum design:

All the wall-to-wall connections on die-cast aluminum parts, regardless of the right angle, acute angle or obtuse angle, the roots of blind holes and grooves, should be designed with rounded corners. Round corners are not used only when they are expected to be determined as parting surfaces For connection, the other parts must be rounded corners. The rounded corners should not be too large or too small. If the die-cast aluminum parts are too small, cracks are likely to occur. If the die-bonded parts are too large, loose shrink holes may occur. R≤wall thickness; the role of rounded corners is to help the flow of metal, reduce eddy currents or turbulence; avoid cracks caused by stress concentration on the parts due to the presence of rounded corners; when parts are to be plated or coated, rounded The corners can be uniformly coated to prevent the deposition at the sharp corners; it can extend the service life of the die-casting mold and will not cause chipping or cracking due to the sharp corners of the mold cavity;