3D Powder Bed Fusion Scanning Aligned With Protective Gas Flow
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Solution Overview
Problem
The quality of three-dimensional objects produced by selective laser sintering or laser melting is compromised due to splashes, fumes, and vapors from the irradiated material interfering with the laser beam, which deteriorates the mechanical properties of the objects.
Innovation Solution
Aligning the scanning direction of the energy beam with the main gas flow direction prevents splashes, fumes, and vapors from entering the laser's optical path, ensuring better object quality and mechanical properties by using a device with a control unit to coordinate the laser scanning and gas flow directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the laser beam scans the material to be solidified, then the three-dimensional object is produced through selective solidification, but splashes, fumes and vapors are produced which may pass into the optical path and deteriorate the quality of the object
Solution Approach 1:
A gas flow is introduced as an intermediary medium between the laser irradiation zone and the optical path. This gas flow acts as a protective barrier that transports splashes, fumes and vapors away from the laser beam path, preventing contamination while allowing the laser to continue solidifying the material effectively
Solution Approach 2:
A directed gas flow is implemented to remove harmful contaminants from the process chamber. The pneumatic system creates a controlled flow field that directs splashes, fumes and vapors away from the optical path, using gas dynamics to solve the contamination problem without interfering with the laser solidification process
2Strength
If the scanning direction of the laser beam is rotated from layer to layer, then the mechanical properties of the object are improved, but the complexity of the process control increases
Solution Approach 1:
The scanning direction of the laser beam is made dynamic by rotating it according to a predetermined pattern from layer to layer. This dynamic adjustment of the scanning direction improves the mechanical properties of the object by creating more uniform stress distribution, while the rotation follows a simple predetermined pattern that limits control 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 effectively prevents contamination from reaching the laser beam, resulting in improved quality and mechanical properties of the produced objects by ensuring that splashes, fumes, and vapors are diverted away from the laser path.
Implementation Method 1
solidifying build material layer by layer at the locations in the respective layer that correspond to the cross section of the object to be produced through the introduction of energy
Implementation Method 2
selective laser sintering or laser melting
Implementation Method 3
selective laser sintering or laser melting
Implementation Method 4
a protective gas inlet and a protective gas outlet are arranged at two opposite ends, through which a directed protective gas flow through the process chamber is produced
Implementation Method 5
splashes, fumes and vapors are produced which expand into the build space
Data Source
AI summary
A method for producing a three-dimensional object by applying layers of a pulverulent construction material and by selectively solidifying said material by the action of energy comprises the steps: a layer of the pulverulent construction material is applied to a support or to a layer of the construction material that has been previously applied and at least selectively solidified; an energy beam from an energy source sweeps over points on the applied layer corresponding to a cross-section of the object to be produced in order to selectively solidify the pulverulent construction material; and a gas flow is guided in a main flow direction (RG) over the applied layer during the sweep of the energy beam. The main flow direction (RG) of the gas flow (G) and the sweep direction (RL) of the energy beam are adapted to one another at least in one region of the cross-section to be solidified.