1. Improve the structure In terms of machine tool structure. The transmission system usually selects spur gears. As soon as the punch starts, the gears are meshed, and a sound is emitted. To reduce or eliminate this friction sound, try to change it to herringbone gear or helical gear for transmission. When unloading the punching parts, try to tilt the bed to make it slide automatically, rather than using high-pressure compressed air to blow it off. In terms of die structure. The punch die in this workshop uses a flat die, which can be replaced by a beveled die. The use of the bevel of the knife edge to separate the sheet material plays a role in delaying the punching time, which can reduce the punching noise to a certain extent. In addition, the shearing angle and punching time also affect the noise. In order to achieve the effect, the shearing angle should be controlled within 8-10. The size of the percent clearance of the stamping die will affect the fracture form of the material, which has a greater impact on its force. When the clearance is small, the noise level is low. 2. Reduce the noise of mechanical stamping. The transmission mechanism of a mechanical punching machine is usually a crank-slider type. When installing bearings, it should be carried out in strict accordance with the specified procedures, and the matching clearance should be kept moderate. When moving, the gap is easy to increase, so high-viscosity lubricating oil can be used to apply to the bearing, which has the effect of increasing damping and reducing noise. Or paste a damping layer on the metal plate stamping, pad the anti-vibration cushion at the impact part of the metal parts, and reinforce it. Stamping noise 3. Reasonable layout of the plant. When the multi-machine linkage automatic line or special stamping production line is arranged in the factory building, the punches are often grouped according to the tonnage, while the ordinary workshop chooses the cluster arrangement. In order to facilitate the operation and reduce the noise, the lathes can be grouped according to the tonnage, and the number of each group is controlled within 5, and a row of machine positions should be vacated between each group as a buffer zone. The punching machine covers an area of 16mZ, and the front and rear spacing should be Zm or more, and the left and right spacing should be greater than lm. 4. Install a vibration damping and noise reduction device. The transmission system of the punching machine is closed with a cover to prevent the diffusion of stamping noise. If the power of the motor is large, stamping noise will be generated, and a sound insulation cover can also be used to seal it. In order to achieve better results, sound insulation can be set at the same time inside and outside, with a sound insulation cover on the outside and an absorbing material on the inside. When installing the punch press, shock pads should be installed. Sound-absorbing walls, sound-absorbing screens, etc. can also be set to absorb sound. 5. Wear earplugs. Reducing contact time If the stamping noise in the workplace is large and uncontrollable, wearing earplugs for workers can reduce or avoid ear hearing damage; there is also a reduction in contact time.