How widely can forgings be used?

2022-04-20

In the process of die forging design, due to the influence of unreasonable blank selection and other factors, backflow or convection phenomenon often occurs in the cavity of the blank, which leads to obvious folding. Conventional flange production molding process. With the punch diameter and the blank diameter. As the ratio between is gradually increasing, the incidence of folding phenomenon will gradually decrease; on the contrary, the incidence of folding phenomenon will be higher.



The increase of mold cavity size proportion value, that is, the gradual deepening and narrowing of the cavity, can greatly reduce the incidence of folding, on the contrary, the incidence of folding phenomenon will be high. As the radius of the punch edge fillet increases gradually, the incidence of folding will decrease, on the contrary, the incidence of folding will be higher. However, the radius only affects the blank with larger diameter, but it has little effect on the punch with smaller diameter.

Forgings are folded by assembling and disassembling the mold for many times. Under normal circumstances, the use temperature of the mold is 25℃. In the multi-fire production process, the repair temperature between the forgings is room temperature. Before the next fire production, the mold needs to be reinstalled, heated, disassembled and other processing, the last fire and this fire after the fire treatment of the mold hitting center usually will not completely coincide. The forgings boss in the upper cavity cannot fully enter the upper cavity, which will lead to folding phenomenon on the side where the impact deviates. The occurrence of this folding phenomenon is similar to the folding caused by forging deformation, but the causes of the two are completely different. The main treatment method is to minimize the die forging fire times, so as to realize the improvement of technological level.



The folding caused by the deformation of the forgings, there are discontinuous, boss shape forgings in the upper module, after the multi-fire die forging treatment, by the impact of factors such as falling and punching edge cutting in the operation process, the die forging usually has different degrees of deformation. In the next fire die forging, as the center of the previous fire hammer is the same as this fire, but the shaped boss can not be all placed into the upper model cavity, and a edge boss of the die forging will produce folding phenomenon, and the more treatment measures, the higher the incidence of folding, the more serious the degree. Therefore, in the die forging process, should minimize the fire times, as far as possible to achieve a fire molding.