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The wall thickness of aluminum castings varies with the different shapes of the aluminum castings, generally known as overlapping boxes, overlapping edges and biased cores. There are many reasons for this problem, such as improper mold matching, damage to the locating pin sleeve, and the mold moving on the aluminum casting, etc. Errors in other parts of the template, model or clay box; It's also possible that the sand box is not suitable; The clay core deforms during production, baking and transportation; The sand box was moved before pouring because the mold to be poured was ignored.

To avoid problems with the thickness of aluminum castings, the damage to the mold and sand box should be adjusted immediately in one aspect to cause the aluminum castings to shift. Also, check whether the locating pins and pins have moved or been damaged. On the sand box and formwork, inspect the locating pins and pin holes to ensure there is no wear or deformation. In addition, the gaps between cores must be strictly adhered to. When molding the template, locating pins should be used to ensure that the postures of the upper and lower shell aluminum castings are consistent. If necessary, tenons can be used to avoid tilting. A clay core not supported by a clay core.

The deformation of aluminum castings is caused by casting stress. The posture and size of aluminum castings do not match the type. The reason is simple: due to the large difference in thickness between the top and bottom, the temperature difference formed by refrigeration is also very large. Since the beams are connected from top to bottom, the thickness of the beams not only shrinks due to the drop in temperature, but also increases due to the reduction in thinness. On the contrary, thin contraction reduces contraction, resulting in thickness contraction exceeding thickness contraction.