Position-Synchronized Laser Arrays for Faster Powder Bed Fusion
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Solution Overview
Problem
Conventional powder bed fusion systems are limited in power delivery per unit area and scalability, leading to constraints in additive manufacturing speed while maintaining high part quality, and existing control systems for multi-laser systems are complex and unsuitable for large numbers of lasers, resulting in errors and increased computational and hardware costs.
Innovation Solution
A scalable laser control system that uses a position sensor to determine the position of a laser array and generates trigger signals for subsets of lasers based on predefined positions, allowing synchronized control of a large number of independent lasers with reduced complexity and increased resolution, using a matrix of laser firing states to manage the activation of lasers in a controlled manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional powder bed fusion systems use single or multi-laser systems with traditional control methods, then the system can maintain operational simplicity, but the power delivery per unit area is limited and manufacturing speed is constrained
Solution Approach 1:
The system segments the laser delivery function into multiple independent laser sources (e.g., 16 or more lasers) arranged in an array, where each laser can be independently controlled to target specific locations on the build surface. This segmentation enables simultaneous multi-point processing, dramatically increasing power delivery per unit area and manufacturing speed while maintaining individual laser control simplicity
Solution Approach 2:
The patent merges multiple laser sources into a coordinated array system that operates as a unified processing platform. By combining the output of multiple lasers and synchronizing their operation through a centralized control system, the system achieves high power delivery across multiple locations simultaneously, resolving the contradiction between power delivery and manufacturing speed
2Productivity
If the system uses a large number of independent lasers to increase power delivery, then the manufacturing speed and resolution improve, but the control system complexity and computational costs increase
Solution Approach 1:
The patent replaces complex mechanical control systems with a digital/computational control architecture. A centralized controller uses software-based trajectory generation and synchronization algorithms to coordinate multiple lasers, replacing what would otherwise require complex mechanical synchronization mechanisms. This substitution reduces physical hardware complexity while enabling precise control of numerous lasers
Solution Approach 2:
The control system is designed as a universal platform that can manage any number of lasers in the array through a single standardized interface and control architecture. The system uses general-purpose computational algorithms and data structures that can accommodate varying numbers of lasers without requiring laser-specific control hardware, reducing overall system complexity while maintaining high productivity
3Adaptability or versatility
If traditional laser scanning systems use galvanometers or motion stages to scan lasers over the build surface, then the system can maintain operational flexibility, but the spacing between optical components increases and system complexity grows
Solution Approach 1:
The patent transitions from traditional one-dimensional laser scanning (moving a single laser back and forth) to a two-dimensional laser array configuration where multiple lasers are arranged in a grid pattern. This dimensional change allows simultaneous processing across the build surface without requiring long optical paths or large component spacing, as each laser in the array can independently target its designated location
Solution Approach 2:
The scanning function is segmented across multiple stationary laser sources arranged in an array, eliminating the need for a single laser to traverse the entire build surface. This segmentation allows compact optical component spacing since each laser remains in a fixed position, yet the system maintains scanning flexibility through electronic control of which lasers are activated and at what power levels
Data Source
AI summary
Laser control systems and related methods for controlling arrays of lasers are disclosed. A laser control system may include a first controller configured to generate a trigger signal based on a position of a laser array, and a second controller configured to send a firing signal to one or more lasers of the laser array upon receiving the trigger signal. The one or more lasers may be selected based on a desired pattern of laser energy to be formed at a particular position of the laser array.