LPBF Defect Detection With Short-Pulse Laser Removal
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Solution Overview
Problem
Laser powder bed fusion (LPBF) processes suffer from defects such as spatter, pores, and stress build-up between layers, which compromise material properties and lead to part weakness or failure, and existing methods fail to detect and correct these defects without slowing or stopping the manufacturing process.
Innovation Solution
A system utilizing a sensor to detect defects and a short-pulse laser to correct them, including a controller to determine defect location and activate the laser for precise removal, enabling continuous manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sensor and short-pulse laser system is added to detect and remove defects during LPBF manufacturing, then part quality and material properties are improved, but device complexity increases
Solution Approach 1:
The sensor system and short-pulse laser system are integrated into the existing LPBF manufacturing system, combining multiple functions (detection, processing, and correction) into a unified system that operates during the manufacturing process without requiring separate standalone systems
Solution Approach 2:
A controller acts as an intermediary between the sensor and the short-pulse laser, processing sensor data and controlling laser activation to remove defects, thereby coordinating the interaction between detection and correction components
2Manufacturing precision
If real-time defect detection and correction is implemented during LPBF manufacturing, then part quality is improved, but manufacturing time increases
Solution Approach 1:
The defect detection and correction process operates continuously during the LPBF manufacturing process without interrupting or stopping the build, allowing the manufacturing action to continue uninterrupted while defects are simultaneously detected and removed
Solution Approach 2:
Defects are detected and corrected during the manufacturing process itself, performing the correction action before the part is completed and before subsequent layers are built, preventing defect propagation without requiring post-processing
3Object-affected harmful factors
If inert gas is added to reduce vapor plumes during LPBF, then harmful factors are reduced, but material property uniformity deteriorates due to uneven cooling
Solution Approach 1:
The system changes the parameters of the short-pulse laser (pulse duration, power, frequency) to precisely control the melting and vaporization of metal powder, achieving adequate protection against vapor plumes and defects without requiring inert gas, thereby maintaining uniform material properties through precise parameter control rather than gas flow
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
The system effectively detects and corrects defects in real-time, maintaining part quality and preventing material weaknesses by using a short-pulse laser to ablate spatter, pores, and reduce stress, ensuring consistent material properties.
Implementation Method 1
A sensor may be used to detect defects in the part or defects in the process
Implementation Method 2
employing a short-pulse laser to correct the defects... activating the laser to remove the defect
Data Source
AI summary
Systems, methods, and programs for detecting and removing defects on a part during laser powder bed fusion manufacturing are described. A sensor may detect defects on the part during manufacturing of the part. A controller may obtain the sensor data and determine the defect and control a short-pulse laser to remove the defect. Furthermore, processes of manufacture and material properties of the part may be evaluated to determine a likelihood of a defect and the short-pulse laser may be operated to reduce the likelihood of the defect. Furthermore, the short-pulse laser may be operated to reduce stress in layers of the part.