Load operation causes noise ?????? load operation causes noise or have the tool and workpiece blank between the stripper plate and hit, hit the punching process of twisting and punching. Precision press stamping process which hit the punching noise biggest twist. ?????? 1. Punch punching noise. Stamping different process steps, big noise difference. Than bending sheet metal stamping, deep drawing big noise. The noise stamping presses, pressure wave, flanging, bending and forming processes such as deep drawing small. ?????? 2. Twist punch hit noise. Twist noise and stamping parts hit the same punch thickness, hardness, geometry, hammering speed, die gap and other factors, the noise increases with the increase of these values. When the punch work, punch and plate materials and stripper plate and billet collision impact greatly enhanced, with the impact velocity increases crash also will increase. Material impact noise punch cracked beneath his feet after its occurrence can be separately measured, this measurement method has been implemented. In the same punch, punching thick, hard material than punching thin, soft material of large noise. For thick sheet ductility, impact noise and cracked beneath his feet to reach the same size. These are a few of plain view Hongye wing.