Mould industry term, because the mould is divided into two parts, which can be separated and combined. When combined, the product is made, and when separated, the product is taken out. Usually, it is a static one and a moving one. According to China's theory of Yin and Yang in the Book of Changes, the static model is called a male model, while the immobile model is called a female model.
For punch forming, the internal dimension of the part is very accurate, because it is the side connected with the thermoforming tool. On the contrary, for female die, the external dimension of the product is very accurate, because its outside is in contact with the thermoforming mold.
Punch rolling and die rolling:
Both punch rolling and die rolling can be used to form shallow and dish-shaped products, but their technological characteristics are different. The feet formed by male mold are smooth and regular, which is better than that of female die. The good quality of feet is an important condition for clothing combustion deformation. In the process of discharging mud, the rolling of the male die is more reasonable than that of the female die, and the mud is continuously and evenly discharged around by the rolling action of the roller head on the mud cake.
The female die is limited by the model, so it is difficult to do this. Punch rolling can be dried with the die, which is convenient for manipulator to take blanks. However, in the drying process of female die blank, operations such as demoulding and backing ring are complicated.
The requirements of male die rolling for blank and model performance are higher than those of female die, and the operation technology is also higher, so it is easy to cause cracks and other defects if it is not mastered well. Relatively speaking, the female die has good adaptability to the blank and model performance, simple operation process and simple processing of the roller head.