With the development of industrial production, noise pollution to the environment and harm to humans are becoming more and more serious. Punching noise is one of the main industrial noise sources. There are many ways to produce and spread the noise of punching presses, and there are many influencing factors. This article will make a simple analysis of the countermeasures to the noise of the press, and put forward some countermeasures in combination with the actual situation.
1. Eliminate noise from working institutions
In order to reduce the clearance, the bearing should be installed according to the specified requirements, and the fitting clearance of the assembly should be appropriate. To increase the gap due to movement, higher viscosity lubricating oil can be used at the bearing to increase damping and reduce the no-load noise of the punch.
2. Improve the structure of the machine tool
The series of open-type double-column fixed table presses and the series of open-type double-column tilting presses are changed to friction clutches. The transmission system of the punch press is mostly driven by spur gears. When the punch gear is engaged, it will make a sound. If the transmission of helical gears or herringbone gears is used, this friction noise can be basically eliminated.
3. Improve the mold structure
The oblique die is used instead of the flat die, and the bevel of the knife edge is used to gradually separate the sheet material, thereby delaying the punching time and achieving a certain noise reduction effect. The noise reduction is related to the shearing angle. The larger the shearing angle, the punching time will increase, and the noise level reduction will increase accordingly. Figure 2 shows the relationship between the shearing angle and the amount of noise reduction. The shearing angle is 8 °~10° is appropriate.
4. Set up sound absorption and vibration reduction devices
How to reduce the noise problem of punch press
Enclose the flywheel of the punch press and its transmission system with a cover, which can significantly reduce the noise of the transmission part. For motors with high power and high noise, local sound insulation covers or enclosed sound insulation covers should also be configured. At the lower part of the punch slide or outside the mold working area, a movable protective grid or soundproof cover is installed. If a soundproof cover is installed on the outside of the mold, and the inner wall of the cover is pasted with sound-absorbing material, the noise reduction effect will be more obvious.
Note: Different on-site environments, different types of presses, and different customer needs, the design of vibration reduction measures and sound insulation cover will be different. When designing the sound insulation cover, not only the noise reduction effect needs to be considered, but also customer needs and the needs of the punching equipment itself, such as the setting of the discharge port, the setting of the soundproof doors and windows, whether it is convenient for workers to operate, and whether it does not affect the service life of the equipment itself Wait.