In recent years, high-power laser cutting has been chosen by more and more metal processing enterprises due to its advantages such as fast cutting speed, large processing width, high processing efficiency, and the ability to cut thicker metal plates. As a metal processing method, high-power laser cutting machines inevitably encounter some technical problems during practical use. If not properly handled, it will affect the cutting effect. The three common technical difficulties and solutions are as follows:

Problem 1: Cutting with stripes

Possible reasons:

1. Incorrect nozzle selection, nozzle too large;

2. Incorrect air pressure setting, excessive air pressure setting resulting in burning and streaking;

3. The cutting speed is incorrect, and too slow or too fast cutting speed can also cause excessive burning.

terms of settlement:

1. Replace the nozzle, replace it with a smaller diameter nozzle, such as a 16mm carbon steel bright cut, and choose a high-speed nozzle D1.4mm; 20mm carbon steel bright surface can choose high-speed nozzle D1.6mm;

2. Reduce cutting pressure and improve the quality of end face cutting;

3. Adjust the cutting speed to match the power and cutting speed appropriately.

Problem 2: There are nodules at the bottom

Possible reasons:

1. The nozzle selection is too small and the cutting focus does not match;

2. Air pressure too low or too high, cutting speed too fast;

3. The material of the board is poor, the quality of the board is not good, and it is difficult to remove lumps with small nozzles.

terms of settlement:

1. Replace the large-diameter nozzle and adjust the focal point to the appropriate position;

2. Increase or decrease the air pressure until the air flow rate is appropriate;

3. Choose good boards.

Question 3: There are burrs at the bottom

Possible reasons:

1. The nozzle diameter is too small to meet the processing requirements;

2. Negative defocus mismatch, should increase negative defocus and adjust the appropriate position

3. The air pressure is too low, resulting in burrs at the bottom that cannot be fully cut.

terms of settlement:

1. Selecting a large-diameter nozzle can increase air flow rate;

2. Increase negative defocus to reach the bottom position of the cutting section;

3. Increasing air pressure can reduce bottom burrs.

A laser cutting machine focuses the laser emitted from the laser into a high-power laser beam through an optical path system. The laser beam irradiates the surface of the workpiece, causing it to reach the melting or boiling point, and high-pressure gas coaxial with the beam blows away the melted or vaporized metal.

As the beam of light moves relative to the workpiece, the material ultimately forms a cutting seam, thereby achieving the purpose of cutting. How much is the laser cutting machine.

Beam laser

During the cutting process of a laser cutting machine, the beam of light is focused into a small focal point through the lens of the cutting head, achieving high power density. The cutting head is fixed on the z-axis. At this point, the heat input by the beam far exceeds the heat reflected, transmitted, or diffused by the material, and the material quickly heats up to the melting and evaporation temperatures. At the same time, high-speed airflow blows out melted and evaporated materials from the coaxial or non coaxial sides, forming holes for material cutting. With the relative movement of the focus and material, the hole forms a continuous and narrow cutting seam, completing the cutting of the material. Like other natural light, lasers are generated by the jumping of atoms (molecules or ions, etc.). However, unlike ordinary light, lasers only rely on spontaneous radiation for a very short period of time, and the subsequent process is completely determined by laser radiation. Therefore, lasers have a very pure color, almost no divergent directionality, high luminous intensity, and high correlation.

Laser cutting is achieved by utilizing the high power density energy generated by laser focusing. Under the control of a computer, the laser outputs a controlled repetitive high-frequency pulse laser through pulse discharge, forming a beam of light with a certain frequency and pulse width. Pulse laser beams are transmitted and reflected through the optical path, focusing on the surface of the processed object, forming subtle high-energy density light spots that melt or vaporize near the surface to be processed. Each high-energy laser pulse instantly splashes out a small hole on the surface of the object. Under computer control, the laser processing head and processing material move continuously relative to each other based on the pre drawn pattern, allowing the object to be processed into the expected shape.