Why is it not round when laser cutting machine cuts round holes?

The traditional method of punching sheet metal is to punch with a punch, which relies on the direct action of external hard force on the surface of the workpiece, which is easy to cause shortcomings such as low accuracy and more edge stab. However, the emergence of laser cutting technology has changed the current inferior situation, and more and more processing enterprises have begun to choose laser to cut round holes. The processing section is smooth, and the diameter can be changed at any time, so the operation flexibility is high. However, with modern processing methods, a skilled operator is needed, and improper operation will cause irregular circles. Let’s sort out the possible problems.

1. It may be that the light intensity is not adjusted well, which leads to the end not overlapping. 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, the frame may jump, and the result will not overlap.

2. Then look at the hardware: beam, lens, nozzle, etc.

3. Check whether the servo motor or the fixing of the cutting head is loose.

4. The blowing pressure is not suitable
In the process of blowing, when the air pressure is too small, there will be slag scraping and carbonization at the edge, and when the air pressure is too high, it will easily burst. Therefore, this requires the perfect cooperation between the craft proofing division and the machine, and chooses the appropriate air pressure by experience, so as to make the cut round hole more full.

5. The round hole is too small
The best scheme for laser cutting machine to cut round holes is that the ratio of round holes is 1: 1, which means that the ratio of aperture to plate thickness is 1: 1. Of course, the larger the ratio, the easier it is to cut high-quality round holes. Otherwise, when the energy of the fiber laser cutting machine is insufficient, it is easy to leave some breakpoints and the round hole is not round when cutting small holes.

6. Servo motor parameters are wrong.
Circular holes sometimes appear elliptical or irregular, which is related to the mismatch of XY axis motion, and the direct cause of the mismatch of XY axis motion is the improper adjustment of servo motor parameters. Therefore, the quality of cutting round holes also has certain requirements for servo motors.

7. The accuracy error of guide rail and lead screw leads to

If the parameter error of servo motor affects the cutting quality, then the accuracy error of guide rail and screw will directly lead to the failure of round hole accuracy. This is related to the strength of laser cutting machine manufacturers. Usually, some small factories will cheat customers that the precision of 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, which will affect the added value of products. Therefore, it is very necessary to choose high quality and big brand laser cutting machine.

All these parameters are used to identify whether the parameters such as the accuracy and speed of cutting round holes meet the standard requirements, and they are enough to identify whether the quality of the purchased laser cutting machine is up to standard. So be sure to keep your eyes open when buying a laser cutting machine.

Four factors affecting the cutting accuracy of fiber laser cutting machine

The size of laser condensation of laser generator: if the spot is small after focusing, the cutting accuracy is high, and if the gap is small after cutting. It shows that the fiber laser cutting machine has high precision and good quality. However, the beam emitted by the laser is conical, so the slit cut out is also conical. Under this condition, the greater the thickness of the workpiece, the lower the accuracy, so the greater the kerf.

Accuracy of the workbench: If the accuracy of the workbench of the fiber laser cutting machine is high, the cutting accuracy will also be increased. Therefore, the accuracy of the worktable 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 cut workpiece is larger, the cutting accuracy will decrease, and the cut gap will be larger.

Different cutting materials will also affect the accuracy of fiber laser cutting machine. Under the same circumstances, the precision of cutting stainless steel and aluminum by fiber laser cutting machine will be different, the cutting precision of stainless steel will be higher, and the section will be smoother.

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