The Marking Precision of Fiber Laser Marking Machine

The marking precision of a fiber laser marking machine is a crucial factor in determining its performance, especially for applications requiring fine details and high accuracy. Here’s a detailed breakdown of the key aspects affecting and defining its precision:

1. Factors Affecting Marking Precision

• Laser Spot Size:

• Fiber lasers typically achieve a spot size as small as 10–30 microns (µm), enabling high-resolution markings.

• Smaller spot size = finer details (e.g., QR codes, micro-text, intricate logos).

• Galvanometer System:

• High-quality galvanometers ensure fast and precise beam positioning (accuracy within ±5 µm).

• Servo or closed-loop galvanometers offer better stability than open-loop systems.

• Laser Wavelength (1064 nm):

• Ideal for metals and some plastics, providing clean, high-contrast marks.

• Software Control:

• Advanced marking software (e.g., EzCad, LaserMark) allows for sub-micron adjustments in design alignment.

• Workpiece Stability:

• Fixturing and vibration control prevent misalignment during marking.

• Material Properties:

• Metals (stainless steel, aluminum) allow for finer marks than rough or uneven surfaces.

  
  

2. Typical Precision Levels

• Standard Fiber Laser Markers: 20–50 µm (suitable for most industrial applications).

• High-Precision Models: 5–20 µm (used in electronics, medical devices, and jewelry).

• Ultra-Fine Marking (Specialized Systems): 1–5 µm (for semiconductor or micro-component marking).

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3. Applications Based on Precision Requirements

• High Precision (5–20 µm):

• PCB serial numbers, micro-engraving, medical stents.

• Medium Precision (20–50 µm):

• Automotive parts, barcodes, tool markings.

• Lower Precision (>50 µm):

• Large industrial labels, rough-surface engraving.

  
  

4. How to Improve Marking Precision?

✔ Use a high-quality galvanometer (e.g., CTI or SCANLAB).
✔ Optimize focal length (shorter focal length lenses provide smaller spots).
✔ Ensure proper cooling to minimize thermal drift.
✔ Calibrate regularly to maintain beam alignment.
✔ Choose the right laser power (too much power can cause "halo" effects).