Operating procedures for pipe cutting machines

I. Preparation before operation
1. Equipment inspection
Appearance inspection: Check the overall appearance of the pipe cutting machine, including the cutting head, drive device (if it is a semi-automatic or automatic cutting machine), track (if any), clamping and positioning device and other components to ensure that there is no obvious damage, deformation or looseness.
2. Cutting head inspection
For flame cutting heads, check whether the preheating nozzle and cutting nozzle are blocked, whether the mixing chamber is working properly, and whether the valve is flexibly opened and closed. Ensure that the gas and oxygen pipelines are firmly connected and leak-free.
For plasma cutting heads, check the wear of the electrodes and nozzles, and whether the protective cover is intact. Check whether the spacing between the electrode and the nozzle meets the equipment requirements and whether the working gas pipeline is tightly connected.
3. Drive device inspection
Check whether the motor and reducer are operating normally and whether there are any abnormal sounds or odors. Check whether the rollers or sliders of the walking mechanism can roll or slide flexibly, and whether the track surface is clean and flat.
4. Control system inspection
Check whether the buttons and knobs on the control panel are working properly and whether the display screen (if any) can display normally. For automatic cutting machines with programming functions, ensure that the programming system can input and read the cutting program normally.
5. Check the clamping and positioning device
Check whether the clamp can firmly clamp the pipe and whether the clamping force is uniform. Whether the scale of the positioning device is clear and whether the positioning accuracy meets the requirements.
6. Power supply check
Check whether the power connection is correct and the grounding is good. For plasma power supply, check whether the output voltage and current are within the normal range and whether the power indicator light is on normally.
7. Pipeline preparation
Clean the surface of the pipe: remove impurities such as oil, rust, dust, etc. on the surface of the pipe to ensure the cutting quality. For pipes with anti-corrosion layer, it is necessary to decide whether to remove the anti-corrosion layer according to the specific situation.
Pipeline positioning: Place the pipe on the workbench of the cutting machine or on a suitable support device, and use the clamping and positioning device to fix the pipe in the correct position. For pipes that need to cut bevels or special shapes, accurately adjust the angle and position of the pipe according to the cutting requirements.
2. Manual pipe cutting machine operating procedures
1. Cutting wheel adjustment
Select a suitable cutting wheel according to the material and thickness of the pipe, and install the cutting wheel on the cutting knife. Adjust the position of the cutting wheel so that it is perpendicular to the surface of the pipe and the cutting edge of the cutting wheel is in good contact with the pipe.
2. Cutting operation
The operator holds the handle of the cutting knife with one hand and holds the pipe with the other hand to keep the cutting knife stable. When starting to cut, gently rotate the handle to make the cutting wheel cut into the surface of the pipe, and then gradually increase the rotation force to keep the cutting wheel rotating at a constant speed. During the cutting process, the position of the cutting knife should be constantly adjusted to ensure that the cutting wheel always cuts along the circumferential direction of the pipe. For longer pipes, it can be cut in sections, but attention should be paid to the docking accuracy of the cutting seam.
3. Cutting completion
When the cutting wheel is about to complete a circle of cutting, reduce the rotation force to avoid excessive cutting of the cutting wheel into the pipe, causing an uneven cutting surface. After the cutting is completed, clean up the burrs and residues on the cutting surface.
III. Operating procedures for semi-automatic pipe cutting machines
1. Parameter setting
According to the material, thickness and cutting requirements of the pipe, set the parameters such as plasma arc current, working gas flow, and cutting speed on the control panel. For different materials and thicknesses, refer to the operating manual of the equipment to determine the appropriate parameter values.
2. Pipe positioning and fixing
Place the pipe accurately on the workbench of the cutting machine and use the clamping device to fix the pipe firmly. Make sure that the axis of the pipe is parallel to the moving direction of the cutting head. For pipes that need to be beveled, adjust the inclination angle of the pipe as required.
3. Cutting operation
Install the plasma cutting gun and aim the cutting gun at the starting cutting position of the pipe. Start the cutting program, and the drive device will drive the cutting gun to cut along the surface of the pipe at the set speed. During the cutting process, pay close attention to the cutting process, observe the stability of the plasma arc, the quality of the cutting surface, etc. If defects are found on the cutting surface (such as slag, uneven cuts, etc.), adjust the cutting parameters in time.
4. Cutting completion
When the cutting gun completes the cutting of the pipe, stop the output of the plasma arc first, and then turn off the drive device. After the cutting head cools down, remove it from the pipe, release the clamping device, and take out the cut pipe. Clean up the slag and spatter in the cutting area.
4. Operating procedures of automatic pipe cutting machine
1. Programming or graphic import
If cutting is performed by programming, write the cutting program in the control system according to the cutting shape (such as intersection line, groove, etc.) and size requirements of the pipe. You can also draw the cutting graphics through CAD software and then import the graphics into the control system of the cutting machine. During programming or importing graphics, ensure that the cutting parameters (such as flame size, cutting speed, cutting angle, etc.) are set accurately.
2. Pipe preparation and positioning
Clean the surface of the pipe and place the pipe on the workbench of the cutting machine, and use the clamping and positioning device to accurately fix the pipe. For cutting tasks with complex shapes, ensure that the position of the pipe corresponds to the coordinate system in the cutting program or graphics.
3. Cutting operation
Check whether the position and angle of the flame spray gun are correct and start the automatic cutting program. The control system of the cutting machine will automatically control the movement, flame size and cutting speed of the flame spray gun according to the program or graphics. During the cutting process, the operator should closely observe the cutting process and check the position of the cutting head, flame status, etc. through the monitoring equipment (if any). If an abnormal situation occurs (such as flame extinguishing, cutting head deviating from the trajectory, etc.), stop the cutting operation immediately, and restart cutting after troubleshooting.
4. Cutting completion
When the cutting task is completed, the automatic cutting machine stops working. Close the gas and oxygen valves of the flame spray gun, wait for the cutting head to cool down, loosen the clamping device, and take out the cut pipe. Clean up the slag, dust and other debris in the cutting area, and perform necessary inspections and maintenance on the equipment.
V. Maintenance and care after operation
1. Equipment cleaning
Turn off the power of the pipe cutting machine, and use a clean cloth or brush to remove dust, slag, splashes and other impurities on the surface of the equipment. For the cutting head part, it is necessary to clean it carefully, such as the preheating nozzle and cutting nozzle of the flame cutting head, and the electrode and nozzle of the plasma cutting head.
2. Component inspection and replacement
Check the wear of components such as the cutting head, drive device, clamping and positioning device. For severely worn components, such as cutting wheels (manual cutters), electrodes (plasma cutting heads), rollers (travel mechanisms), etc., replace them in time. Check various pipelines (such as gas, oxygen, working gas pipelines, etc.) for leaks. If there are leaks, repair or replace the pipelines in time.
3. Lubrication and tightening
Properly lubricate the moving parts of the equipment (such as rollers, sliders, motor shafts, etc.) and use appropriate lubricants (such as lubricating oil or grease). Check whether the bolts, nuts and other fasteners on the equipment are loose. If they are loose, tighten them in time to ensure the stability and safety of the equipment.