In precision shaft die-casting processing, the control of dimensional accuracy is crucial. The following are some of the main factors that affect the dimensional accuracy of Precision Shaft Die Casting Processing:
First of all, the accuracy and quality of the die-casting mold is one of the key factors. The manufacturing accuracy of the mold directly determines the initial size of the die-cast product. If the mold is worn, deformed or unreasonably designed, such as inaccurate cavity size, improper draft, etc., it will lead to product size deviations. For example, after the mold is used for a long time, the mold cavity will undergo slight deformation due to the impact of high temperature and high pressure, causing the size of the die-cast shaft parts to become larger or smaller.
The setting of die-casting process parameters has a significant impact on dimensional accuracy. If the parameters such as pressure, speed, temperature and time during die-casting are not properly controlled, the molten metal will fill the mold cavity unevenly. Too much pressure may cause excessive wear of the mold, thereby affecting the size of subsequent products; too little pressure may result in insufficient filling of the molten metal, resulting in dimensional defects. If the temperature is too high or too low, it will affect the fluidity and solidification speed of the molten metal, thereby affecting the dimensional accuracy.
The performance and composition of die-cast materials cannot be ignored either. Different shrinkage rates of materials will lead to dimensional changes in the product after die casting. If the shrinkage rate of the selected material is large, large dimensional shrinkage will occur during the cooling and solidification process, making it difficult to meet high precision requirements.
The performance and stability of die-casting equipment also affect dimensional accuracy. Insufficient clamping force of the equipment may cause the mold to expand during the die-casting process, resulting in product dimensions that are out of tolerance. If the injection system of the equipment is not precise enough to accurately control the injection volume and speed of molten metal, it will also affect the size of the product.
Cooling conditions during the die casting process are also important factors. Uneven cooling will cause various parts of the product to shrink inconsistently, causing dimensional deviations. Cooling rates that are too fast or too slow will adversely affect dimensional accuracy.
In addition, subsequent processing steps, such as deburring, cutting, etc., if not performed properly, may also affect the final dimensional accuracy of the product. For example, unreasonable parameter settings such as feed amount and cutting speed during cutting may remove too much material, resulting in smaller dimensions.
The maintenance and upkeep of the mold will also indirectly affect the dimensional accuracy. If the mold is not maintained and maintained regularly, accumulated dirt, wear and other problems will gradually increase, ultimately affecting product dimensions.
To sum up, there are many factors that affect the dimensional accuracy of Precision Shaft Die Casting Processing, including mold accuracy, process parameters, material properties, equipment performance, cooling conditions, subsequent processing procedures, and mold maintenance. In actual production, these factors need to be considered comprehensively and through strict quality control and optimization processes to ensure that the dimensional accuracy of die-cast products meets the requirements.
