Factors affecting the accuracy of aluminum die casting mold

The accuracy of aluminum die casting mold is directly related to the quality of die-casting products, and many factors will affect its accuracy.

1. Mold design

Reasonableness of structural design

If the parting surface design of aluminum die casting mold is unreasonable, it may cause gaps when closing the mold, affecting the flash condition of die-casting products. If the demoulding slope is not designed properly, it will cause demoulding difficulties and even damage the mold, thus affecting the accuracy.

The design of the gate and runner system affects the flow state of the molten metal. If the runner size is inaccurate or the layout is unreasonable, the molten metal will flow unevenly and the pressure distribution will be uneven, thus affecting the dimensional accuracy of the casting.

Dimension calculation accuracy

When designing the mold, the size calculation of key parts such as the cavity and core must be accurate. If the shrinkage rate is calculated incorrectly, the size of the aluminum alloy parts after die casting will deviate from the design requirements, resulting in reduced accuracy.

2. Manufacturing process factors

Processing equipment accuracy

The processing equipment used, such as CNC machine tools, is not accurate enough to guarantee the processing size accuracy of mold parts. For example, in milling, drilling and other processing procedures, if the positioning accuracy of the machine tool is low, the shape and size of the processed mold parts will be deviated.

Processing process parameters

In cutting processing, improper settings of parameters such as cutting speed, feed rate and cutting depth will cause problems such as excessive cutting force and excessive cutting heat, which will cause part deformation and affect the overall accuracy of the mold.

Heat treatment process is also critical. If the heating speed, holding time and cooling speed are not well controlled during the heat treatment process, the mold will deform, crack and other problems, seriously affecting the accuracy.

3. Assembly link

Assembly accuracy

When assembling aluminum die casting mold, the assembly accuracy of each component is very high. For example, if the assembly gap between the core and the cavity, the matching accuracy of the guide column and the guide sleeve, etc. do not meet the requirements, it will affect the opening and closing movement accuracy of the mold, and then affect the accuracy of the die-casting product.