In industrial cutting scenarios, compressed air is used 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 in different cutting processes, which need to be scientifically configured in combination with specific working conditions. The following from the cutting process, equipment characteristics, safety specifications three dimensions, analysis of compressed air in the cutting operation of the common pressure range.
1. cutting process and pressure requirements
- plasma cutting
- pressure range: Usually required0.4-0.6MPa (4-6bar)of compressed air.
- Technical principle: High-pressure air is ionized under the action of an arc to form a plasma cutting metal. Insufficient pressure will cause arc instability and rough cutting surface; too high pressure may increase energy consumption and accelerate electrode wear.
- laser cutting
- pressure range: The auxiliary gas pressure is generally0.2-0.4MPa (2-4bar).
- Technical principle: Compressed air is used as an auxiliary gas to blow away the molten metal and cool the cutting head. The pressure needs to match the laser power, too low will cause slag residue, too high may cause airflow disturbance.
- Mechanical cutting (e. g. pneumatic saws, pneumatic shears)
- pressure range: usually0.1-0.3MPa (1-3bar).
- Technical principle: 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. If it is too low, it will cause insufficient power. If it is too high, it may accelerate the wear of parts.
Effect of 2. equipment characteristics on pressure
- hand-held cutting tools
- pressure demand: usually0.3-0.5MPa (3-5bar).
- Characteristics: Portability and cutting efficiency need to be taken into account, and pressure setting needs to balance equipment weight and power output.
- Automatic cutting machine
- pressure demand: usually0.5-0.8MPa (5-8bar).
- Characteristics: Need to support continuous high-speed cutting, pressure stability requirements are higher, often equipped with gas storage tanks and pressure stabilizing devices.
- Cutting material thickness
- sheet (≤5mm): The pressure can be appropriately reduced0.3-0.4MPa (3-4bar)to reduce deformation.
- Thick plate (> 5mm): The pressure needs to be increased0.6-0.8MPa (6-8bar)to ensure penetration.
3. safety specifications and operational recommendations
- pressure setting principle
- avoid overpressure: Excessive pressure may cause increased equipment vibration, seal leakage, and even damage to the cutting head.
- Avoid low pressure: Insufficient pressure will lead to a decrease in cutting efficiency and increase the cost of secondary processing.
- pressure fluctuation control
- configuration of gas tank: It is recommended to configure the air storage tank according to 1/3-1/2 of the air compressor displacement to buffer pressure fluctuations.
- Install pressure regulator valve: Install a pressure regulator valve at the air inlet of the cutting equipment to ensure that the pressure is stable within ± 0.05MPa.
- Regular inspection and maintenance
- pressure gauge calibration: Check the accuracy of the pressure gauge every month to avoid pressure loss due to instrument errors.
- Pipeline inspectionregularly check the pipeline leakage, especially the vulnerable parts such as joints and elbows.
4. Typical Application Scenario Reference
| cutting process | common pressure range (MPa) | typical application scenarios |
|---|---|---|
| plasma cutting | 0.4-0.6 | sheet metal blanking and steel structure processing |
| laser cutting | 0.2-0.4 | precision sheet metal processing, auto parts manufacturing |
| pneumatic sawing | 0.1-0.3 | wood, plastic pipe cutting |
| pneumatic shear | 0.2-0.5 | sheet metal strip, advertising word production |
conclusion
the pressure setting of compressed air in cutting operation shall be determined comprehensively according to the process type, equipment characteristics and material thickness. In general, plasma cutting needs 0. 4-0.6MPa, laser cutting needs 0. 2-0.4MPa, mechanical cutting needs 0. 1-0.3MPa. Enterprises should ensure that the pressure is stable in a safe and efficient range by configuring gas storage tanks, pressure stabilizing valves and regular inspection and maintenance to balance cutting quality, equipment life and operating costs.
