As a kind of thermal cutting technology, laser pipe cutting machine cannot avoid using perforation cutting technology when cutting thicker pipes. There are two methods of laser perforation commonly used at present. Let's take a look at it together.
Blasting perforation: After the material is irradiated by continuous laser, a pit is formed in the center, and then the molten material is quickly removed by the oxygen flow coaxial with the laser beam to form a hole. Generally, the size of the hole is related to the thickness of the pipe. The average diameter of the blasting perforation is half of the thickness of the pipe. Therefore, the blasting perforation for thicker plates is larger and not round, and should not be used on parts with higher requirements (such as oil screen slit pipes). ), can only be used on scrap, and because the oxygen pressure used for perforation is the same as that for cutting, the splash is larger.
Pulse perforation: A high peak power pulse laser is used to melt or vaporize a small amount of material. Air or nitrogen is often used as an auxiliary gas to reduce the expansion of the hole due to exothermic oxidation. The gas pressure is lower than the oxygen pressure during cutting. Each pulsed laser produces only a small jet of particles, progressively deeper, so the perforation time for thick plates takes a few seconds. Once the piercing is complete, immediately change the assist gas to oxygen for cutting. In this way, the diameter of the perforation is smaller, and the perforation quality is better than that of blasting perforation. The laser used for this purpose should not only have high output power; more importantly, the time and space characteristics of the beam, so the general cross-flow CO2 laser can not meet the requirements of laser cutting.
In addition, pulse perforation also needs a more reliable gas circuit control system to realize the switching of gas type, gas pressure and control of perforation time. In the case of pulse piercing, in order to obtain high-quality cuts, attention should be paid to the transition technology from pulse piercing when the workpiece is stationary to constant-speed continuous cutting of the workpiece.
The commonly used pipes for wheelchairs are mostly carbon steel, aluminum alloys and other metal materials. The traditional pipe processing methods are relatively complicated, requiring multiple processes such as cutting, punching, and drilling, which consume a lot of molds, manpower, and high investment costs. Later, the laser pipe cutting process was introduced into the pipe processing process, without the need for mold opening, it can be adapted to the cutting of pipes with different diameters, avoiding the high cost of knife mold processing, and saving a lot of time and money.
When the laser cutting machine is used to cut the metal of the pipe, the CNC system and the equipment are combined to directly cut the pipe when the hole is punched. Many pipe workpieces have different drilling requirements. Some of them are very short and some are very long. The laser cutting machine only needs to set the size to complete the cutting and drilling needs at one time.
Different types of special-shaped cutting can be completed by adjusting the settings of different shapes of the metal when the laser cutting machine is cutting metal.
A part of the metal needs to be cut in a wire shape, which is difficult to achieve in the past. It is difficult to make the metal cutting small and smooth without burrs. However, the focused spot of the laser beam emitted by the laser cutting machine is small, so the cutting seam of the laser cutting is fine and the precision is high.
The demand for bevel cutting is difficult to achieve with traditional cutting equipment, but the use of laser cutting machines can complete automatic feeding and unloading fully automatic production lines, which also saves labor costs.