The rule of casting a cold die process without tolerance
The cold die process is a metal casting process in which molten metal is poured into a metal mold to form a metal part. In order to ensure the accuracy and quality of the metal part shape, the metal mold must be carefully designed and manufactured, and must be strictly controlled during manufacturing and use.
In the process of casting a cold die, whether it is mass production or trial production of metal parts, it is necessary to control the accuracy of the metal parts. One parameter in the control accuracy is the tolerance of the metal parts. Generally speaking, tolerance refers to the difference between the two adjacent sizes of a metal part formed by a part. In the process of casting a cold die without tolerance, how to make the die casting parts meet the requirements of accuracy?
In the process of casting a cold die without tolerance, the main control accuracy lies in the process and design of the mold. First of all, the design of the metal mold should be completed according to the design drawing of the metal part. The internal dimensions of the die should be determined according to the nuances stipulated in the design drawing, including the parallelism of the interior size and the size of each part. Secondly, the core of the die should be designed to ensure that the metal parts will not shift too much and the parallelism of the surfaces exposed after the parts are cleaved should be checked. In addition, the metal mold should be heated so that the molten metal can be fully filled, cooled, and solidified quickly, and the surface temperature of the mold should be closely monitored to avoid temperature differences, so as to ensure the accuracy of the die surface temperature.
When the metal die is manufactured and assembled, strong fixtures should be used to ensure that the parts are aligned. The accuracy of the alignment should be checked, and the internal parts should be assembled as closely as possible so that the parts are integrated. Besides, the mold should be polished and cleaned before the die casting process to avoid the defects caused by debris, rust spots and the like.
In the die casting process, the temperature of the molten metal is a very important factor. The temperature of the molten metal should be closely monitored to avoid errors when the metal is poured. The mold temperature should also be closely monitored to avoid temperature differences and ensure uniform cooling and solidification.
Last of all, when the metal parts are obtained, they should be tested. According to the requirements of the design drawing, the appearance and size should be measured, and the deviation should be controlled within the specified range.
In short, although the cold die process is a versatile process that can be used to produce metal parts of various shapes and sizes, in order to ensure the accuracy of the metal parts, the process must be strictly controlled. Especially for the process without tolerance, the key lies in the design and assembly of the mold, the temperature control and the quality inspection after the die casting process.
