Compressed air is used when cutting. What is the pressure generally?
In industrial cutting scenarios, compressed air serves as a power source or auxiliary medium, and its pressure setting directly affects cutting efficiency, quality and equipment life. There are significant differences in the pressure requirements of compressed air for different cutting processes, which need to be scientifically configured based on specific working conditions. The following analyzes the common pressure range of compressed air in cutting operations from three dimensions: cutting process, equipment characteristics, and safety specifications.
1. Cutting process and pressure requirements
- plasma cutting
- pressure range: Usually required0.4-0.6MPa（4-6bar）compressed air.
- technical principle: High-pressure air is ionized under the action of an arc, forming a plasma to cut metal. Insufficient pressure can cause unstable arc and rough cutting surfaces; too high pressure may increase energy consumption and accelerate electrode loss.
- laser cutting
- pressure range: Auxiliary gas pressure is generally0.2-0.4MPa（2-4bar）。
- technical principle: Compressed air serves as an auxiliary gas to blow away molten metal and cool the cutting head. The pressure needs to match the laser power. Too low will lead to slag remaining, and too high may cause airflow turbulence.
- Mechanical cutting (e.g. pneumatic saws, pneumatic shears)
- pressure range: Usually0.1-0.3MPa（1-3bar）。
- technical principle: The compressed air drives the pneumatic motor to drive the saw blade or cutter head to move. The pressure needs to be adjusted according to the power of the tool. Too low will lead to insufficient power, and too high may accelerate component wear.
2. Influence of equipment characteristics on pressure
- Handheld cutting tool
- pressure demand: Usually0.3-0.5MPa（3-5bar）。
- characteristics: Need to balance portability and cutting efficiency, pressure setting needs to balance equipment weight and power output.
- Automatic cutting machine
- pressure demand: Usually0.5-0.8MPa（5-8bar）。
- characteristics: Continuous high-speed cutting needs to be supported, pressure stability requirements are higher, and air tanks and pressure stabilizing devices are often equipped.
- Cutting material thickness
- Thin plate (≤5mm): Pressure can be appropriately reduced to0.3-0.4MPa（3-4bar）to reduce distortion.
- Thick plate (>5mm): Pressure needs to be increased to0.6-0.8MPa（6-8bar）to ensure penetration.
3. Safety specifications and operating recommendations
- Pressure setting principles
- Avoid overpressure: Excessive pressure may cause increased vibration of the equipment, leakage of seals, and even damage to the cutting head.
- Avoid low pressure: Insufficient pressure will lead to a decrease in cutting efficiency and increase secondary processing costs.
- Pressure fluctuation control
- Configure air storage tank: It is recommended to configure the air storage tank at 1/3-1/2 of the air compressor displacement to buffer pressure fluctuations.
- Install pressure regulating valve: Install a pressure stabilizing valve at the air inlet of the cutting equipment to ensure that the pressure is stable within ±0.05MPa.
- Regular testing and maintenance
- Pressure gauge calibration: Check the accuracy of the pressure gauge every month to avoid losing control of pressure due to instrument errors.
- line checking: Regularly check for pipeline leaks, especially vulnerable parts such as joints and elbows.
4. Reference for typical application scenarios
| cutting process | Common pressure range (MPa) | typical application scenarios |
|---|---|---|
| plasma cutting | 0.4-0.6 | Metal plate blanking and steel structure processing |
| laser cutting | 0.2-0.4 | Precision sheet metal processing, auto parts manufacturing |
| pneumatic sawing | 0.1-0.3 | Cutting wood and plastic pipes |
| pneumatic cutting | 0.2-0.5 | Sheet metal slicing and advertising word making |
conclusion
The pressure setting of compressed air during cutting operations needs to be comprehensively determined based on the process type, equipment characteristics and material thickness. In general, plasma cutting requires 0.4-0.6MPa, laser cutting requires 0.2-0.4MPa, and mechanical cutting requires 0.1-0.3MPa. Enterprises should ensure that the pressure is stable in a safe and efficient range by configuring air tanks, pressure stabilizing valves and regular inspection and maintenance to balance cutting quality, equipment life and operating costs.