What Problems May Be Encountered During Sheet Metal Laser Cutting?

Although sheet metal laser cutting offers high precision and high efficiency, it can still cause problems due to factors such as materials, equipment, processes, and the environment. The following are key issues and solutions:

1. Cutting Quality Defects

Burrs and Dross: These are often caused by insufficient laser power, low gas pressure, or focus deviation, resulting in incomplete blowout of the molten metal. Optimize power-speed matching, ensure gas purity (≥99.9%) and stable pressure, and regularly calibrate the focus position (tolerance ≤±0.05mm).

Rough Cut Surfaces: Surface oxide layers, nozzle diameter mismatch, or beam pattern degradation are the main causes. Pre-treat the material surface, select an appropriate nozzle (e.g., a 1.0mm nozzle for 0.5- 2mm thin sheet), and check laser output stability.

Excessive Heat-Affected Zone: Excessive continuous wave power or materials with high thermal conductivity (such as copper and aluminum) can easily cause this problem. Switch to pulsed cutting mode, choose a fiber laser (the heat-affected zone is 30%-50% smaller than a CO₂ laser), or pre-apply a heat-absorbing coating.

1. Equipment and Process Abnormalities

Wire breakage during cutting: Common causes include uneven material distribution, fluctuating gas flow rates, or transmission system jams. Material uniformity testing, installation of closed-loop gas flow control, and regular maintenance of the guide rails and lead screws are necessary.

Path deviation: Mechanical transmission backlash, insufficient encoder resolution, or incorrect drawing scale may cause this problem. Use a laser interferometer to calibrate the transmission, upgrade to a high-resolution encoder, and verify the consistency between the drawing and the processing file.

3. Material and Cost Issues

Highly reflective materials are difficult to cut: Copper and aluminum have low laser absorption. Blue lasers (450nm wavelength, copper absorption rate >60%) or surface coatings with light-absorbing coatings can be used.

Low material utilization: Flaws in the typesetting algorithm or inefficient waste material management are the main causes. Intelligent typesetting software should be introduced and a waste material database established to facilitate reuse.

4. Safety and Environmental Risks

Laser radiation and smoke: Dual-circuit safety interlocks are mandatory, activated carbon and HEPA filters are installed, and optical path components must be cleaned regularly. By optimizing process parameters, strengthening equipment maintenance, and introducing intelligent control systems, cutting stability and economic efficiency can be systematically improved.