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How to avoid shrinkage holes and shrinkage problems on die castings

How to avoid shrinkage holes and shrinkage problems on die castings

How to avoid shrinkage holes and shrinkage problems on die castings



I. Characteristics and inspection methods:

(1) Anatomical or flaw inspection, the shape of the holes is irregular, unsmooth, and the surface is dark-colored.

(2) Large and concentrated for shrinkage holes, small and scattered for shrinkage loose.



II. Causes:

(1) castings in the solidification process, due to the production of shrinkage, do not get the metal compensation, thus causing holes;

(2) Pouring temperature is too high, mold temperature gradient distribution is unreasonable;

(3) Pressure injection ratio pressure is low, the pressurization pressure is too low;

(4) The inner gate is thin, the area is too small, premature solidification, is not conducive to the pressure transfer and the liquid metal complementary contraction;

(5) The casting structure has a hot section parts or cross-section changes drastically;

(6) The amount of liquid metal pouring is small, the residual material is too thin, can not play the role of shrinkage.



III.Treatment methods:

(1) Reduce the casting temperature to minimize shrinkage;

(2) Improve the specific pressure of compression injection and pressurization pressure to improve the densification;

(3) Modify the inner gate, so that the pressure is better transferred, in favor of liquid metal shrinkage effect;

(4) Change the casting structure, eliminate metal accumulation parts, wall thickness as uniform as possible;

(5) Speed up the cooling of thick parts;

(6) Thicken the material handle 15~30mm, increase the effect of contraction.


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