3D Laser Lacquer Removal for Transparent Plastic Surfaces
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Solution Overview
Problem
Existing methods are unsuitable for removing lacquer coating material from large surfaces of complex three-dimensional transparent plastic parts, as they fail to achieve precise and large-area material removal.
Innovation Solution
The method involves moving the laser machining point along multiple adjacent meandering work paths, with the laser unit adjusting its position and angle to follow the three-dimensional surface, using adjustable deflecting mirrors and actuators to maintain a constant beam angle and precise control of operating parameters such as pulse duration and power, ensuring complete removal of the lacquer coating without damaging the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing laser removal methods are used on complex three-dimensional transparent plastic parts, then the substrate integrity is maintained, but the lacquer coating cannot be completely removed from large surfaces
Solution Approach 1:
The work path is divided into multiple adjacent segments that are processed sequentially. The laser machining point moves along several adjacent work paths, with each path covering a specific region of the lacquer coating. This segmentation allows complete removal of lacquer from large surfaces while maintaining precision control over each segment, resolving the contradiction between removal completeness and processable area.
2Loss of substance
If the laser beam is applied to remove lacquer coating, then the lacquer material is removed, but the transparency of the transparent plastic substrate may be compromised
Solution Approach 1:
The laser beam parameters are optimized to achieve selective removal of lacquer coating while preserving the transparent plastic substrate. By controlling the laser energy density and exposure time locally at the machining point, the process removes lacquer material effectively while maintaining the optical properties and structural integrity of the substrate, thus resolving the contradiction between substance removal and composition stability.
3Manufacturing precision
If the laser unit follows the three-dimensional surface contour, then precise large-area removal is achieved, but the device complexity increases
Solution Approach 1:
The laser unit is designed with dynamic positioning capabilities that allow it to follow the three-dimensional contour of the workpiece surface. The laser beam is deflected by controllable deflecting mirrors and positioned by actuators that adjust the laser unit's position and orientation in real-time. This dynamic adaptation enables precise following of complex surface geometries while maintaining manufacturing precision, resolving the contradiction between surface following accuracy and device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise and large-area removal of lacquer coating material on complex three-dimensional surfaces, maintaining the transparency and integrity of the substrate, enabling the restoration of transparency in decorative elements like motor vehicle lighting components.
Implementation Method 1
generating and emitting a laser beam by the laser unit according to the generated values for the operating parameters, applying the emitted laser beam to the painted workpiece arranged in the machining position at a machining point in the region of the surface of the painted workpiece provided with the lacquer coating, so that material of the lacquer coating is removed locally at the machining point
Implementation Method 2
material of the lacquer coating is removed locally at the machining point
Implementation Method 3
The laser radiation used for this purpose has a high power density and leads to rapid heating of the material and the formation of a plasma on the surface. With laser pulses in the nanosecond range, the energy of the laser leads to a heating of the surface (in the sense of thermal movements of the atoms) during the laser pulse
Implementation Method 4
Ionization (thermally, by laser light or electron impact) creates a plasma of electrons and ions of the removed material at a high power density of the laser
Data Source
AI summary
A method for the material-removing laser machining of a workpiece, comprising a substrate element made from a plastic with a surface, and a lacquer coating applied to the surface prior to the laser machining, wherein the lacquer coating can be removed from a workpiece with a three-dimensional extent in a large-area region of the surface.