Ruida 6445G 30W RF Metal Tube DC24V CO2 Laser Cutting Engraving Machine 900MM*600MM Cutting Area 6090
Enclosed Type
How to solve the common problems in laser cutting sheet metal
by：Transon
2020-10-31
1.
Laser cutting punching technology
any kind of thermal cutting technology, except a few cases can start on the plate edge, usually have to punch a small hole in the plate. In laser punching compound machine is to use the punch first rushed out of a hole, and then begin from the holes by laser cutting. With no stamping device of laser cutting machine there are two kinds of the basic ways of perforation:
blasting hole - — Material after continuous laser irradiation in the center of the formation of a pit, and then by coaxial laser beam with oxygen flow quickly remove the molten material to form a hole. General hole size and thickness, average diameter of blasting perforation thickness of the half, so the blasting perforation aperture is bigger, thicker plate and not round, should not be used on machining precision to demand higher parts, can only be used for waste. In addition due to perforation of oxygen to the same pressure and cutting, splash is bigger.
- pulse perforation — Using pulse laser peak power make a small amount of material to melt or vaporize, commonly used as auxiliary air or nitrogen gas, to reduce the make hole expansion with exothermic oxidation, gas pressure is cutting the oxygen pressure is small. Each pulse laser to produce only a small particle injection, gradually thorough, so thick plate punch time takes a few seconds. Once the perforated completion, auxiliary gas into oxygen cutting. This perforation diameter smaller, the perforation quality is better than that of blasting hole. For the use of laser should not only have high output power; More important is time and space characteristics of beam of light, so the general crosscurrent CO2 laser can not adapt to the requirements of laser cutting. Pulse perforation also need to have a reliable pneumatic control system, so as to realize the switch of the gas type, gas pressure and aperture time control.
in the case of using pulse perforation, in order to obtain high quality of incision, from workpiece resting pulse perforation to the transition of workpiece speed continuous cutting technology should be attention. In theory usually change accelerating period of cutting conditions, such as focal length, position of nozzle, gas pressure, but in fact, due to the time is too short to change the above conditions is unlikely. Mainly used in industrial production realistic change of laser average power method, the specific method is to change the pulse width; Change the pulse frequency; Change the pulse width and frequency at the same time. Practical results show that the third effect is good.
2。 Cutting machining holes ( Small diameter and thickness) On the basis of analysis on deformation
this is because the machine tools ( Only for high power laser cutting machine) In machining holes not adopt the method of blasting hole, but with the pulse perforation ( Soft puncture) Way, which makes the laser energy is too concentrated in a small area, will not processing areas also burned, cause hole deformation, affect the processing quality. Should be at this time we will process pulse perforation ( Soft puncture) Way to blasting perforation ( Ordinary puncture) Way, try to solve. For the low power laser cutting machine, on the contrary, should take the way of pulse perforation when holes machining good surface finish can be achieved.
3。 Laser cutting low carbon steel, artifacts appear burr solution
based on the work and the design principle of CO2 laser cutting, analysis the following reasons is the main cause of mechanical parts produce burr: fluctuation of laser focus position is not correct, you need to do to test focus position, adjust according to the offset of the focus; The laser output power is not enough, need to check whether the laser generator working normally, if the normal, is to observe the laser control button on the output value is correct, try to adjust; Cutting speed too slow, need to increase the linear velocity when operating control; Cutting gas purity is not enough, need to provide the high quality of cutting gas; Laser focus shifts, focus location test is needed to make adjustment according to the offset of focus, Machine tool operation instability time is too long, need to shutdown restart at this time.
any kind of thermal cutting technology, except a few cases can start on the plate edge, usually have to punch a small hole in the plate. In laser punching compound machine is to use the punch first rushed out of a hole, and then begin from the holes by laser cutting. With no stamping device of laser cutting machine there are two kinds of the basic ways of perforation:
blasting hole - — Material after continuous laser irradiation in the center of the formation of a pit, and then by coaxial laser beam with oxygen flow quickly remove the molten material to form a hole. General hole size and thickness, average diameter of blasting perforation thickness of the half, so the blasting perforation aperture is bigger, thicker plate and not round, should not be used on machining precision to demand higher parts, can only be used for waste. In addition due to perforation of oxygen to the same pressure and cutting, splash is bigger.
- pulse perforation — Using pulse laser peak power make a small amount of material to melt or vaporize, commonly used as auxiliary air or nitrogen gas, to reduce the make hole expansion with exothermic oxidation, gas pressure is cutting the oxygen pressure is small. Each pulse laser to produce only a small particle injection, gradually thorough, so thick plate punch time takes a few seconds. Once the perforated completion, auxiliary gas into oxygen cutting. This perforation diameter smaller, the perforation quality is better than that of blasting hole. For the use of laser should not only have high output power; More important is time and space characteristics of beam of light, so the general crosscurrent CO2 laser can not adapt to the requirements of laser cutting. Pulse perforation also need to have a reliable pneumatic control system, so as to realize the switch of the gas type, gas pressure and aperture time control.
in the case of using pulse perforation, in order to obtain high quality of incision, from workpiece resting pulse perforation to the transition of workpiece speed continuous cutting technology should be attention. In theory usually change accelerating period of cutting conditions, such as focal length, position of nozzle, gas pressure, but in fact, due to the time is too short to change the above conditions is unlikely. Mainly used in industrial production realistic change of laser average power method, the specific method is to change the pulse width; Change the pulse frequency; Change the pulse width and frequency at the same time. Practical results show that the third effect is good.
2。 Cutting machining holes ( Small diameter and thickness) On the basis of analysis on deformation
this is because the machine tools ( Only for high power laser cutting machine) In machining holes not adopt the method of blasting hole, but with the pulse perforation ( Soft puncture) Way, which makes the laser energy is too concentrated in a small area, will not processing areas also burned, cause hole deformation, affect the processing quality. Should be at this time we will process pulse perforation ( Soft puncture) Way to blasting perforation ( Ordinary puncture) Way, try to solve. For the low power laser cutting machine, on the contrary, should take the way of pulse perforation when holes machining good surface finish can be achieved.
3。 Laser cutting low carbon steel, artifacts appear burr solution
based on the work and the design principle of CO2 laser cutting, analysis the following reasons is the main cause of mechanical parts produce burr: fluctuation of laser focus position is not correct, you need to do to test focus position, adjust according to the offset of the focus; The laser output power is not enough, need to check whether the laser generator working normally, if the normal, is to observe the laser control button on the output value is correct, try to adjust; Cutting speed too slow, need to increase the linear velocity when operating control; Cutting gas purity is not enough, need to provide the high quality of cutting gas; Laser focus shifts, focus location test is needed to make adjustment according to the offset of focus, Machine tool operation instability time is too long, need to shutdown restart at this time.
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