模锻生产中,在压力机上进行热锻件的切边、冲孔工序是经常遇到的。为保持压力机与模锻设备的生产拍节,通常情况下均采用压力机在一个行程中能同时完成热锻件的切边和冲孔的复合模。中小型锻件内孔需冲穿的连皮直径(或异形孔的相当直径)往往比较小,当采用较细的冲头并固定在下模时,由于长时间受到下模内存放的热锻件的影响,冲头会强烈地过热并迅 Forging production, the hot forging on the press trimming, punching process is often encountered. In order to maintain the production of presses and forging equipment, it is common to use a press in the same stroke to complete the trimming and punching composite mold for hot forging. Small and medium-sized forging pieces to punch through the skin diameter (or the equivalent diameter of the hole) is often relatively small, when using finer punches and fixed in the lower mold, due to a long time by the mold under the influence of hot forging , The punch will overheat strongly and quickly