Acalme sua prensa de perfuração: dicas para reduzir a poluição sonora

Quiet Your Drill Press: Tips to Reduce Noise Pollution

What about the NC punch noise?

The evolution from traditional punching to CNC punching has greatly improved the stamping production of many factories. The implementation of CNC punching technology has significantly improved the quality, precision and efficiency of stamped parts, resulting in greater savings in human and material resources.

As a result, CNC punching has gradually replaced traditional punching methods. To control the noise generated by the punch, companies typically install soundproofing covers for the punches. For organizations with higher requirements, a combination of vibration dampening devices, sound insulation covers and other comprehensive measures can be implemented.

  • The equipment foundation must be constructed in accordance with the guidelines specified in the installation manual. The machine tool mounting screws must be fully tightened to ensure stability and minimize vibrations.
  • Using shock-absorbing feet can reduce press vibration and its impact on nearby equipment.
  • Digging a shock-absorbing trench can also minimize the punch's impact on surrounding equipment. The depth of the trench must reach the washing depth to be effective.
the noise of the NC punch

To minimize punch noise, the following measures must be taken, starting with the noise source and the matrix structure:

  • Ensure proper maintenance and cleaning of the mold, keeping the edge sharp.
  • After mold debugging, sound insulation covers or sponge plates should be installed on the punch for sound insulation.
  • Aluminum plates are placed on the surface of the upper and lower die bases for shock absorption.
  • The exhaust grooves are processed to match the precision of the working models.
  • The strike plate is divided into smaller pieces, and the strike plate and bottom formwork are changed to an insertion type to reduce the contact area.
  • The spring source of the stripper plate is changed to a T-shaped ejector rod, with the spring installed on the upper base of the die and the contour sleeve combined with the ejector rod to ensure that the stripper plate still has some freedom of movement when the matrix is ​​open.
  • Maintain adequate lubrication, ensuring the mold is free from interference and operates smoothly.
  • Improve punching accuracy and reduce structural noise by installing a damping, vibration and noise reducing oil cylinder on the bench. The gear is lubricated with helical teeth and has a gear cover, as well as a silencer installed in the pneumatic system.
  • The edge of the die should be perpendicular to the installation surface, with the corresponding gap between the tongue and groove edge of the die being reasonable. When unloading is difficult, the die bottom clearance and unloading force can be increased, and a soft surface unloading plate can be used.
  • The shape, quantity, material and punching line of the die edge must be optimized. The contact surface between the edge of the die and the parts should not be too large. The punch must use an angled edge for step cutting, resulting in different cutting depths at different positions and a cutting process rather than synchronous extrusion.
how to reduce press noise

How to reduce press noise?

1. Determination of reverberation time and noise value of the noise source in the workshop:

Reverberation time refers to the period it takes for sound to reach a stable state after the sound source stops producing sound. When the sound source ceases, the residual sound is reflected back and forth within the room, absorbed by the walls, and the average sound energy density decreases to one millionth of its initial value.

A longer reverberation time indicates that the sound is reflected multiple times into the workspace, resulting in a slower rate of energy attenuation. Under the same sound source conditions, a workspace with a long reverberation time will have higher noise levels compared to a workspace with a short reverberation time.

2. Selection of sound-absorbing materials:

The sound insulation board is made up of five components.

Noise penetrates the sound-absorbing cotton through the small holes in the perforated plate. Part of the energy is transformed into thermal energy through the vibration of the glass wool fibers and is then dissipated.

The other part is isolated by the external steel plate, achieving absorption and separation.

Both sides of the sound-absorbing cotton are covered with a sound-permeable film to prevent moisture and fix the absorbing cotton to the inner perforated plate mesh.

3. Sound absorption board sealing treatment:

To achieve effective noise reduction in the production line, a series of small sound-absorbing plates are assembled to form a sealed body. To ensure that the noise reduction effect is not compromised, the space between each sound-absorbing board must be precisely controlled during the design and manufacturing phases, typically ranging from 1 to 2 mm.

To prevent noise from escaping through these gaps, a sealant is typically used to seal the gaps. This helps maintain the effectiveness of noise reduction efforts.

4. Ventilation treatment:

The heat generated by the operation of the equipment and the thermal insulation properties of the sound-absorbing material, glass wool, often result in an internal temperature in the production line that is 3 to 5 degrees Celsius higher than the external temperature.

To address this, an exhaust fan is typically installed on top of the soundproofing wall when implementing noise reduction measures. The hot air within the enclosed space is then extracted, creating negative pressure and allowing outside air to flow through the soundproofing wall.

When selecting a range hood, it is important to choose a low-noise model to avoid interfering with noise reduction efforts.

5. Treatment of lighting equipment:

After carrying out the attached project, the interior of the equipment is isolated from the workshop's external lighting. As a result, a lighting system must be installed inside the cabinet.

To ensure that the necessary lighting is available for production and equipment maintenance, design lighting is set at a minimum of 500 lumens. The lighting system inside the cabinet must be wired separately and have its own switch, allowing convenient use without impacting the original power system.

Furthermore, an emergency lighting system is installed in the premises to ensure safety in the event of a power failure in the workshop.

The outer steel plate, with a thickness of 2mm, serves as sound insulation and supporting layer, and is the outer surface of the sound-absorbing plate. The central part of the sound-absorbing board is made of sound-absorbing material such as glass wool products and is the main component responsible for reducing noise. A fiberboard is placed on the outside of the sound-absorbing cotton to secure it in place.

These are the measures that can be taken to reduce the noise generated by the press. It is hoped that this information will be useful.

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