Laser cutting of medium and heavy plates sheet by sheet metal laser cutting machine is a very good method, which is also the current trend. However, if it is not handled properly during use, problems will occur. The following is an example of JNCT LASER TECHNOLOGY Co., Ltd. to illustrate common problems encountered when sheet metal laser cutting machine cutting medium and thick metal sheet with laser.
1. When fiber laser cutter cutting mild steel, the workpiece has burrs
The main cause of the workpiece burr: the upper and lower positions of the sheet metal laser cutting machine laser focus are not correct, the focus position test needs to be performed, and the offset is adjusted according to the focus; the sheet metal laser cutting machine laser output power is not enough, it is necessary to check whether the laser cutter generator is working normally, if it is normal, observe the laser control button The output value of the cutting line is correct and adjusted; the sheet metal laser cutting machine cutting line speed is too slow, and the line speed needs to be increased during the operation control process; the purity of the sheet metal laser cutting machine cutting gas is not enough, and high-quality cutting working gas must be provided; moving, need to do focus position test, according to the focus Adjust the offset; the machine running time is not stable for too long and needs to be shut down and restarted.
2. When laser cutting stainless steel and aluminum-zinc plates, the workpiece has burrs
In the above case, the first thing to consider for sheet metal laser cutting machine is the burr when cutting low carbon steel, but it is not easy to increase the cutting speed, because the speed of the plate sometimes does not wear the plate cutting, which is processing aluminum-zinc sheet. At this time, other factors of the machine tool should be considered comprehensively, such as whether the nozzle should be replaced, and whether the motion of the guide rail is unstable.
3. The sheet metal laser cutting machine laser is not completely cut off
The reasons for this problem are: the choice of sheet metal laser cutter laser head nozzle does not match the thickness of the processed metal sheet; the laser cutting line speed is too fast, and operation control is needed to reduce the line speed; in addition, special attention is needed to cut 5 mm in the L3030 laser cutting machine. For the above-mentioned carbon metal sheet, it is necessary to replace the 7.5″ focal length laser lens.
4. Abnormal sparks will be generated when cutting mild steel
This situation will affect the quality of the sheet metal laser cutting machine cut section of the part. At this time, if other parameters are normal, the following conditions should be considered: the loss of the laser head nozzle NOZZEL should be replaced in time. If the nozzle is not replaced with a new nozzle, the sheet metal laser cutting machine cutting working air pressure should be increased; the threads at the joint between the nozzle and the laser head are loose. At this point, you should stop cutting immediately, check the connection status of the laser head, and re-thread.
5. The selection of the puncture point in the laser cutting process.
From the penetration of the medium and thick metal sheet to the contour of the cut part, the vector direction of the laser beam will vary greatly. The 90° rotation in the vector direction is rotated by the tangent direction perpendicular to the cutting contour. It is consistent with the tangent of the cutting contour, that is, the sheet metal laser cutting machine angle with the tangent of the contour is 0°. This will result in a rougher cutting surface on the cut portion of the processed material, which is mainly due to the rapid change in the vector direction of the laser beam during the movement in a short period of time. Therefore, you must pay attention to this situation when using sheet metal laser cutting machine parts. Generally, when the design component has no roughness requirement for the surface cutting fracture, laser cutting programming can be carried out without manual processing, so that the control software automatically generates the puncture point; however, when the design has a cutting part on the part to be processed At high roughness. When asked, it is necessary to pay attention to this question. It is usually necessary to manually adjust the starting position of the laser beam during the laser cutting process, that is, manually control the puncture point. It is necessary to move the puncture point initially generated by the laser program to a reasonable position as needed to meet the surface accuracy requirements of the processed part.