Optical Mask Modulates Laser Beam for 3D Printing Control
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Solution Overview
Problem
Current 3D printing systems face challenges in controlling the characteristics of 3D objects, such as shape, roughness, and porosity, to achieve desired dimensions and properties.
Innovation Solution
The system employs a platform with a powder bed, a layer forming device, an elevator, and a processing chamber with a laser and gas flow system. The gas flow system creates an optical mask on a window by depositing particles, which modifies the peak power density of the laser beam, allowing for controlled porosity and surface roughness in the 3D objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a laser beam is used to melt powder bed material, then the 3D object can be formed with desired dimensions, but the characteristics such as porosity and surface roughness cannot be precisely controlled
Solution Approach 1:
An optical mask is introduced as an intermediary component between the laser source and the powder bed. This mask modulates the laser beam's energy distribution, enabling precise control over melting characteristics, porosity, and surface roughness without requiring complex adjustments to the laser source or processing parameters.
Solution Approach 2:
The patent utilizes changes in optical parameters (mask material composition, thickness, pattern geometry) to control the laser beam's energy distribution. By varying these optical parameters, precise control over the melting process, porosity formation, and surface roughness is achieved while maintaining relatively simple system architecture.
2Productivity
If the laser beam power is increased to improve melting efficiency, then productivity increases, but the control over material characteristics deteriorates
Solution Approach 1:
The optical mask creates non-uniform energy distribution across the laser beam cross-section, with different regions having different transmission characteristics. This enables local control over energy input, allowing high overall power for efficient melting while maintaining precise local control over material characteristics through the mask's spatially varying pattern.
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 enables the formation of 3D objects with precise control over porosity and surface roughness, improving the quality and characteristics of the printed objects.
Implementation Method 1
a gas flow system configured to provide a flow of gas within the internal volume of the processing chamber, which flow of gas provides a stream of particles that progressively deposits an optical mask on an internal surface of the window
Implementation Method 2
a laser configured to generate a laser beam that melts at least a portion of the powder bed to a molten material as part of the three-dimensional object during the printing
Data Source
AI summary
The present disclosure describes three-dimensional (3D) printing apparatuses, processes, software, and systems for producing high quality 3D objects. Described herein are printing apparatuses that facilitate control of energy beam characteristics using an optical mask during one or more printing operations.