Laser Array Scan Patterns for Higher DMLM Utilization
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Solution Overview
Problem
Existing Direct Metal Laser Melting (DMLM) systems suffer from poor laser array utilization, resulting in increased manufacturing costs and reduced efficiency due to most lasers being OFF for the majority of the component buildup time.
Innovation Solution
Implementing novel scan strategies that allow the laser arrays to sweep across the build platform in radial, circumferential, or modified zig-zag patterns, with only a portion of the lasers being ON at any given time, optimizing the operation of individually operable laser beams to generate successive layers of melted powdered material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all lasers in the array are kept ON 100% of the time, then manufacturing time is minimized and productivity is maximized, but manufacturing cost increases due to unnecessary energy consumption and equipment wear
Solution Approach 1:
The system dynamically adjusts the operational state of individual lasers in the array based on real-time process requirements. The controller selectively activates only those lasers needed for current melting operations while keeping others in standby, creating a dynamic balance between productivity and energy consumption rather than using a static all-on approach.
Solution Approach 2:
Different lasers in the array are treated with different operational qualities - some are actively melting powder while others remain in standby mode. This local differentiation allows the system to concentrate energy where needed for rapid layer formation while avoiding unnecessary energy consumption in regions where no material processing is occurring.
2Productivity
If all lasers in the array are kept ON 100% of the time, then manufacturing speed is maximized, but manufacturing cost increases due to poor laser utilization
Solution Approach 1:
The system applies partial action by activating only the subset of lasers required for current processing needs rather than all lasers simultaneously. This partial activation maintains adequate manufacturing speed by concentrating power where needed while improving overall laser utilization efficiency by avoiding redundant activation of unnecessary lasers.
Solution Approach 2:
The controller ensures continuous useful action by seamlessly managing the activation and deactivation of lasers as the build platform moves and layers are formed. This continuous optimization maintains high manufacturing speed while ensuring that laser energy is consistently applied only where material processing is actually occurring, eliminating periods of useless laser operation.
3Loss of energy
If individual lasers are selectively turned ON and OFF during sweeping, then laser utilization is improved and manufacturing cost is reduced, but system complexity increases due to control requirements
Solution Approach 1:
The controller automatically manages the selective activation and deactivation of lasers based on real-time monitoring of build platform position, layer geometry, and material distribution. This self-service approach improves laser utilization by ensuring each laser operates only when and where needed, while the automated control logic manages the complexity internally without requiring external intervention or complex manual coordination.
Solution Approach 2:
The system employs feedback mechanisms where the controller continuously monitors the state of the build process including platform position, laser melting effectiveness, and material distribution. Based on this feedback, the controller dynamically adjusts which lasers remain active versus switched to standby, optimizing laser utilization while the feedback loop manages the control complexity through closed-loop regulation rather than open-loop 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 enhances laser array utilization, reducing the overall cost of part manufacture and improving manufacturing efficiency by ensuring that only necessary lasers are active during the building process.
Implementation Method 1
The laser arrays generate multiple laser beams that melt the powder material on the build platform in and around the area where the laser beams are incident on the powder material, resulting in a melt pool
Data Source
AI summary
An additive manufacturing system configured to manufacture a component including scan strategies for efficient utilization of one or more laser arrays. The additive manufacturing system includes at least one laser device, each configured as a laser array, and a build platform. Each laser device is configured to generate a plurality of laser beams. The component is disposed on the build platform. The at least one laser device is configured to sweep across the component and the build platform in at least one of a radial direction, a circumferential direction or a modified zig-zag pattern and simultaneously operate the one or more of the plurality of individually operable laser beams corresponding to a pattern of the layer of a build to generate successive layers of a melted powdered material on the component and the build platform corresponding to the pattern of the layer of the build. A method of manufacturing a component with the additive manufacturing system is also disclosed.