The traditional method of sheet metal punching is to use a punch, which relies on external hard force acting directly on the surface of the workpiece, which is easy to cause shortcomings such as low accuracy and many edge stabs. However, the emergence of laser cutting technology has changed the current situation of disadvantage. More and more processing enterprises begin to choose laser to cut circular holes. Its processing section is smooth, and the diameter can be changed at any time. It has high operational flexibility. However, with modern processing methods, it also needs a skilled operator. Improper operation will cause irregular circles. Xiaobian and everyone sort out the possible problems.
1. It may be that the light intensity is not adjusted well, resulting in no coincidence at the end. Generally speaking, the difference between the maximum light intensity and the minimum light intensity should not exceed 5%, and the speed should not be adjusted too fast. If it is too fast, it may skip frames, and the result will not coincide.
2. Then look at the hardware: whether there are problems with the beam, lens, nozzle, etc.
3. Check whether the servo motor or the cutting head is loose.
4. Inappropriate blowing pressure
In the process of air blowing, when the pressure is too low, slag scraping and carbonization will occur at the edge, and if the pressure is too high, holes will easily explode. Therefore, it requires that the process proofer and the machine cooperate perfectly, and choose the appropriate air pressure based on experience, so as to make the cut round hole fuller.
5. Round hole is too small
The best scheme for laser cutting machine to cut circular holes is the ratio of circular holes 1:1, that is, the ratio of hole diameter to plate thickness is 1:1. Of course, this ratio, that is, the larger the hole diameter, the easier it is to cut high-quality circular holes. Otherwise, when the energy of the optical fiber laser cutting machine is insufficient, it is easy to leave broken points and circular holes are not round.
6. Servo motor parameter error
The circular hole sometimes appears ellipse or irregularity, which is related to the movement mismatch of XY axis, and the direct cause of the movement mismatch of XY axis is the improper adjustment of servo motor parameters. Therefore, the quality of cutting round holes also has certain requirements for servo motors.
7. Accuracy error of guide rail and lead screw
If the servo motor parameter error affects the cutting quality, then the accuracy error of the guide rail and the lead screw will directly lead to the round hole accuracy not reaching the expectation. This is related to the strength of the laser cutting machine manufacturers. Usually, some small factories will deceive customers that the precision of the laser cutting machine can reach 0.1mm, but in fact, in the actual operation process, the quality and effect of laser drilling will be poor, affecting the added value of the product. Therefore, it is necessary to select high-quality and large brand laser cutting machines.
All these parameters are used to identify whether the accuracy, speed and other parameters of cutting round holes meet the standard requirements, which are enough to identify whether the quality of the laser cutting machine purchased is up to standard. Therefore, you must keep your eyes wide open when purchasing the laser cutting machine.
Four factors affecting the cutting accuracy of fiber laser cutting machine
Size of laser coagulation of the laser generator: if the spot is small after aggregation, the cutting accuracy is high, and if the gap is small after cutting. It shows that the fiber laser cutting machine has high accuracy and good quality. However, the light beam emitted by the laser is tapered, so the slit cut out is also tapered. Under this condition, the greater the thickness of the workpiece, the lower the accuracy will be, so the larger the slit will be.
Accuracy of the workbench: if the accuracy of the workbench of the fiber laser cutting machine is very high, the accuracy of the cutting will also be increased. Therefore, the accuracy of the table is also an important factor to measure the accuracy of the laser generator.
The laser beam condenses into a cone: when the fiber laser cutting machine cuts, the laser beam is tapered downward. At this time, if the thickness of the cutting workpiece is large, the cutting accuracy will be reduced, and the cut gap will be large.
The cutting materials are different: it will also affect the accuracy of the fiber laser cutting machine. In the same case, the accuracy of cutting stainless steel and aluminum by fiber laser cutting machine will be different, the cutting accuracy of stainless steel will be higher, and the cutting surface will be smoother.