The punch has the characteristics of fast speed and high pressure. The reasons for the noise of the punch during operation under load are the impact between the tool and the workpiece or the unloading plate and the blank, the twisting and punching of the punching process. When the noise of the press is severe, it will have a bad impact on the workshop operators and the surrounding environment, so it is said that corresponding noise reduction measures should be taken. The following are specific instructions:
1. Punching and shearing noise
The stamping process is different, and the noise is very different. Blanking of sheet metal is more noisy than bending and Deep Drawing, while the noise of forming processes such as embossing, crimping, flanging, bending, and deep drawing is smaller.
2. Twisting noise
The twisting noise of similar punches is related to the plate thickness, hardness, geometry, hammering speed, die gap and other factors of the stamping parts. The noise increases with the increase of these values. When the punch is working, the collision impact between the punch and the sheet material and the discharge plate and the blank is greatly enhanced. As the impact speed increases, the impact sound also increases. The impact noise and the subsequent material fracture sound can be measured separately. The measurement method has been put into practice. On the same punching machine, the noise of punching thick and hard materials is louder than punching thin and soft materials. For thick ductile sheets, the impact noise is as large as the fracture noise.
The punching press runs abnormally or has abnormal noises, such as battering and cracking. The twisting and punching noises during the punching process are more prominent. The feeding should be stopped immediately and the cause should be checked. If the rotating parts are loose, the control device fails, and the mold is loose or defective, stop and repair it.