The wall thickness of Dongguan precision castings changes with the appearance of aluminum castings. They are usually called staggered boxes, staggered edges and eccentric cores. There are many reasons for this problem, such as poor mold matching, wear of positioning pin sleeves, and molds in aluminum castings. Move up and so on. Errors in other parts of the mold, model, or mud box. It is also possible that the sand box is not suitable; the clay core is deformed during manufacturing, baking and transportation; the sand box moves due to neglect of the mold to be poured before pouring.

In order to avoid problems with the wall thickness of aluminum castings, one aspect should immediately repair the damage of the mold and the sand box to cause the aluminum casting to deflect; and whether the positioning pins and positioning pins are moved or damaged, check the sand box and the template. Locating pins and pin holes are free from wear and deformation.

In addition, the gap between the core and the core must be strictly enforced. Dongguan Precision Casting should use positioning pins when molding the template to ensure that the appearance of the aluminum castings of the upper and lower boxes are consistent; if necessary, the tenon can be used to avoid skew. A clay core supported without a clay core.

The deformation of aluminum castings is caused by casting stress. The appearance and size of aluminum castings do not match the type. The reason is very simple. Due to the large difference in thickness between the upper and lower sides, the temperature difference caused by cooling is also large. The ridge is fast, and the close is fast. Because the beams are connected up and down, the thickness of the beam is not only shrunk due to the decrease in temperature, but also expanded and shrunk due to thin compression. Conversely, the thin shrinkage reduces the shrinkage, causing the thickness shrinkage to be greater than the thickness shrinkage. The bending of the cast aluminum dotted line indicates that there is a large thermal stress in the beam.

The typical bending deformation of precision castings in Dongguan is the machine bed. It is because the surface of the guide rail of the bed is thicker and the rest is thinner, resulting in uneven cooling rate and bending deformation. The reverse direction deformation casting process is established to overcome it.