Post-Processing of FDM 3D-Printed Polylactic Acid Parts by Laser Beam Cutting

Area of Science:

• Materials Science and Engineering
• Additive Manufacturing
• Laser Processing

Background:

• 3D-printed poly lactic acid (PLA) parts often exhibit edge defects after fused deposition modeling (FDM).
• Post-processing is crucial for enhancing the dimensional accuracy and surface quality of FDM parts.
• Low-power CO2 laser treatment presents a potential solution for defect mitigation.

Purpose of the Study:

• To investigate the post-processing of 3D-printed PLA parts using a low-power CO2 laser.
• To examine the effects of laser process parameters on kerf geometry and part quality.
• To determine optimal parameters for achieving high-quality laser post-processing.

Main Methods:

• Fused Deposition Modeling (FDM) was used to fabricate 3.2 mm thick PLA samples.
• A Design of Experiments (DOE) approach was employed to study laser process parameters.
• Key parameters investigated included focal plane position, laser power, and laser cutting speed.

Main Results:

• The study analyzed geometrical features such as top/bottom kerf width and taper.
• Regression equations were derived to model the relationship between process parameters and kerf quality.
• Optimal parameters were identified, leading to excellent physical features and precise kerf dimensions (e.g., 276.9 μm top, 261.5 μm bottom kerf width).

Conclusions:

• Laser post-processing is effective in improving the quality of 3D-printed PLA parts.
• Optimized CO2 laser parameters can achieve high-precision kerf geometry and superior part features.
• The findings provide valuable insights for industrial applications of laser post-processing in additive manufacturing.