1、 第 1 页 共 9 页 SOLVING PUNCH HEAD BREAKAGE PROBLEMS Punch fracture, especially in heavy stamping and high-speed press work during the compression cutting, is a serious problem. High-speed stamping process of rapid shear rate may make ordinary strength of cutting load increases to as close to the ultim
2、ate tensile strength. Figure 1. The stamping process compressed cutting operations happened. The factors to punch fracture High stripping load tends to head fracture. However, the single high stripping load cannot make head down. Peel strength depends on the amount of several factors. These factors
3、include: 1 and the type of handle mould thickness. 2 the use of lubrication. 3 the scratches on the press or stamping wear. 4 punch and stamping mould sharp degree. According to the different speed and working conditions, another punch fault model, is due to cap over Under pressure and heavy load ca
4、used by the reverse, especially in high-speed operation process and cutting thick billet is more serious when. Please note that the tensile strength, stripping may not be enough to cause by. The failure mode is usually the cyclical loading and crack propagation in failure. Figure 2 shows the failure of stamping part of start-up.
