Alternating Hatch Pattern for Additive Manufacturing Heat Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing additive manufacturing (AM) techniques face challenges in producing a desired melt pattern while maintaining build speed, often resulting in inaccuracies and material defects due to improper heat management and laser control during the scanning process.
Innovation Solution
An improved scanning strategy using an alternating hatch pattern with angled solidification lines within stripe regions, allowing for varied angles between linear paths to control microstructure and heat distribution, thereby enhancing build efficiency and reducing material defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional laser scanning strategies are used to maintain build speed, then productivity is improved, but manufacturing precision deteriorates due to inaccuracies in melt pattern and material defects
Solution Approach 1:
The patent applies dynamics by making the laser scanning strategy adaptive and variable rather than static. The scan pattern dynamically adjusts parameters such as hatch spacing, scan speed, and laser power based on real-time process conditions and layer geometry, allowing the system to maintain high build speeds while ensuring precise melt patterns and reducing material defects through continuous optimization of scanning parameters
Solution Approach 2:
The patent implements parameter changes by systematically varying scanning parameters including hatch line spacing, scan speed, laser power, and hatch pattern orientation across different layers and regions. This dynamic parameter adjustment enables the process to maintain productivity while improving manufacturing precision by optimizing heat input and melt pool characteristics for each specific building condition
2Productivity
If conventional laser scanning strategies are used to maintain build speed, then productivity is improved, but reliability deteriorates due to material defects such as lack of fusion porosity and boiling porosity
Solution Approach 1:
The patent applies feedback by implementing monitoring and control mechanisms that track process parameters and material deposition quality in real-time. This feedback system allows the laser scanning strategy to adjust scanning parameters dynamically to prevent defect formation, ensuring reliable defect-free builds while maintaining high productivity through proactive rather than reactive process control
Solution Approach 2:
The patent uses dynamics to transition from static scanning parameters to adaptive scanning strategies that respond to changing process conditions. By dynamically adjusting scan speed, power, and hatch patterns based on real-time feedback and predictive modeling, the system maintains high build speeds while ensuring reliable defect-free material deposition throughout the entire building process
3Device complexity
If conventional hatch patterns are used, then device complexity is reduced, but manufacturing precision deteriorates due to inability to control microstructure and heat distribution
Solution Approach 1:
The patent applies segmentation by dividing the build area into multiple zones with different hatch patterns and scan strategies. This segmentation allows independent optimization of microstructure and heat distribution in different regions of the component, achieving precise microstructure control while maintaining manageable system complexity through modular pattern design
Solution Approach 2:
The patent implements dynamics by making the hatch pattern adaptive and variable across different layers and regions rather than uniform throughout. The system dynamically selects and adjusts hatch patterns, scan directions, and parameters based on local geometry and desired microstructure, achieving precise microstructure control while keeping device complexity manageable through algorithmic rather than hardware 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 improves the microstructure and material properties of the finished component by optimizing heat buildup and reducing unnecessary jumps and transitions of the laser, leading to increased build efficiency and reduced material defects.
Implementation Method 1
AM techniques may be characterized by using a laser or an energy source to generate heat in the powder to at least partially melt the material
Implementation Method 2
selective laser sintering, direct laser sintering, selective laser melting, and direct laser melting are common industry terms used to refer to producing three-dimensional (3D) objects by using a laser beam to sinter or melt a fine powder
Implementation Method 3
melting entails fully melting particles of a powder to form a solid homogeneous mass
Implementation Method 4
Rapid heating and solidification may cause high thermal stress and cause localized non-equilibrium phases throughout the solidified material
Data Source
AI summary
A scanning technique for the additive manufacturing of an object. The method comprises the irradiation a portion of a given layer of powder to form a fused region using an energy source. When forming an object layer by layer, the irradiation follows a first irradiation pattern at least partially bounded by a stripe region. When forming the first fused region using a first irradiation pattern a first series of solidification lines are formed, at angle other than 90° with respect to a substantially linear stripe region boundary. A series of second solidification lines are formed that intersecting the end of the first solidification line at a first angle other than 0° and 180° with respect to the first solidification line. A third series of solidification lines are formed that are substantially parallel to a first series of solidification lines and intersect one of the second solidification lines.