Views: 48 Author: DURMAPRESS Publish Time: 2021-04-26 Origin: DURMAPRESS
1. Discussion on the cutting and perforation skills of laser equipment high efficiency fiber laser tube cutting machine
Any hot-opening technique, except in a few cases where it can start at the edge of the board, usually requires a small hole to be punched through the board.Before in the laser stamping compound fiber laser tube cutting machine is to punch out a hole, and then use the laser from the beginning of the hole to cut.
Therefore, there are two ways to perforate fiber laser cutting machine without stamping equipment:
[pulse perforation] -- select high power pulse laser to melt or vaporize a few materials, commonly used as air or nitrogen as auxiliary gas, in order to reduce the hole expansion due to exothermic oxidation, the gas pressure is smaller than the oxygen pressure when the cut.Each laser pulse produces only small bursts of particles, gradually deepening, so it takes a few seconds for the plate to perforate.Once the perforation is complete, the auxiliary gas is immediately replaced with oxygen for the cut.In this way, the perforation diameter is smaller and the perforation quality is better than that of explosion perforation.For this reason, the laser used must not only have high output power, but also the time and space characteristics of the beam.In addition, it is necessary to have a more reliable gas control system to complete the switch of gas varieties, gas pressure and control the time of perforation.
[Explosive perforation] -- a hole is formed in the middle of the material after being illuminated by a continuous laser beam, and then a flow of oxygen coaxial with the laser beam quickly removes the molten data to form a hole.Usually the size of the hole is related to the thickness of the plate, the uniform diameter of the explosion perforation is half of the thickness of the plate, so the thickness of the plate explosion perforation aperture is larger, and not round, should not be used in the processing precision of the parts with higher demand, can only be used for waste.In addition, due to the perforation of the oxygen pressure and cut the same, the splash is larger.
2. When laser processing stainless steel and aluminum zinc plate, the workpiece has burr
In this case, first of all, we must think about the elements of the burr when cutting stainless steel, which can not simply accelerate the cutting speed, because the added speed sometimes appears in the plate cut, especially in the processing of aluminized zinc steel plate this phenomenon is particularly prominent.At this time, other elements of the fiber laser cutting machine should be considered to solve, such as whether the nozzle is to be replaced, the movement of the guide rail is unstable, etc.
3. Analysis of the deformation of small holes during cutting
This is because the machine tool in the processing did not adopt the method of explosion perforation, but with pulse perforation method, so that the laser energy in a small area is too concentrated, the non-processing area is also burnt, resulting in the deformation of the hole, affecting the processing quality.At this time, pulse perforation method should be changed to explosion perforation method in the machining process.For fiber laser cutting machine with low power, on the contrary, pulse perforation should be adopted to obtain a better surface finish.
4. The solution of abnormal spark in processing low carbon steel
This condition will affect the quality of the cutting and section finish of the parts.At the moment in the case of other parameters are normal, should think about the following questions :1, laser head nozzle loss?The nozzle should be replaced in time.In the absence of replacement of a new nozzle, the cutting operation gas pressure should be increased;2, nozzle and laser head connection thread loose?At this moment should be immediately suspended cut, check the laser head connection, good thread from the beginning.
5. The reason why the workpiece appears burr when laser cut low carbon steel
According to the operation and planning principle of fiber laser cutting machine, the following reasons are analyzed and obtained:
1, the laser focus of the upper and lower azimuth is not correct, need to do focus azimuth test, according to the focus of the offset to adjust;
2, the output power of the laser is not good, need to check the operation of the laser generator is not normal, if normal, then investigate the output value of the laser control button is not correct, and then adjust;
3. The line speed of cutting is too slow, so it is necessary to increase the line speed during control;
4, the purity of the cut gas is not good, need to supply high quality cut gas;
5, laser focus offset, need to do focus azimuth test, according to the focus of the offset adjustment;
6, the machine tool running time is too long presents the instability, now need to shut down and restart.
6. The laser is not thoroughly cut through the situation
After analysis can be found that the following several conditions are the primary condition of processing instability: laser head nozzle selection and processing plate thickness does not match;Laser cutting line speed is too fast, need to reduce the line speed in the control;Due to the large error of nozzle induction rejection to laser focus orientation, nozzle induction data should be detected from scratch, especially when aluminum is cut.