Triangle Hatch Pattern for Additive Manufacturing Heat Control
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Solution Overview
Problem
Existing additive manufacturing 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, varying the angle between linear paths for each layer to control microstructure and prevent heat concentration, thereby enhancing build efficiency and material properties.
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 improper heat management and material defects
Solution Approach 1:
The patent implements alternating hatch patterns where the laser scanning direction periodically changes between layers. Odd layers are scanned in one direction while even layers are scanned in the opposite direction, creating a periodic action that prevents heat concentration in single directions and improves both build speed and melt pattern accuracy simultaneously
Solution Approach 2:
The patent dynamically adjusts the scanning strategy by varying the angle of solidification lines for each layer. The angle is changed systematically between layers to optimize heat distribution and prevent defects, allowing the system to adapt scanning parameters in real-time to maintain precision at high build speeds
2Productivity
If high concentrations of heat are generated in the powder over a short period to maintain build efficiency, then productivity is improved, but manufacturing precision deteriorates due to high thermal stress and localized non-equilibrium phases
Solution Approach 1:
The patent segments the heat input by dividing the build into alternating layers with different scanning directions. Each layer receives heat treatment independently with optimized scanning parameters, preventing cumulative thermal stress and controlling microstructure development while maintaining overall build efficiency
Solution Approach 2:
The patent applies local quality control by tailoring the scanning angle and heat input parameters to specific layers. Each layer receives customized heat treatment based on its position in the build, ensuring optimal microstructure control in different regions while maintaining high build efficiency
3Manufacturing precision
If the laser scanning strategy is optimized for microstructure control with angled solidification lines, then manufacturing precision is improved, but device complexity increases due to varying angles for each layer
Solution Approach 1:
The patent simplifies the scanning strategy complexity by using a periodic alternating pattern between layers. The systematic alternation between odd and even layers with fixed angle relationships reduces the need for complex real-time calculations while achieving superior microstructure control
Solution Approach 2:
The patent implements dynamic scanning angle adjustment through a systematic pattern that changes angles between layers. This dynamic approach optimizes microstructure control while using predetermined angle sequences that simplify control algorithm complexity compared to fully adaptive strategies
4Device complexity
If conventional hatch patterns are used to maintain simple scanning, then device complexity is reduced, but manufacturing precision deteriorates due to heat concentration and material defects
Solution Approach 1:
The patent eliminates material defects by implementing periodic alternation of scanning directions between layers. This simple periodic pattern prevents heat concentration and ensures uniform melting without requiring complex real-time monitoring or adjustment systems
Solution Approach 2:
The patent segments the scanning pattern into alternating layers with different directions. This segmentation approach distributes heat input more evenly throughout the powder bed, preventing localized defects while maintaining relatively simple scanning control logic
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 allows for increased control over the microstructure and material properties of the finished component, reducing material defects and improving build efficiency by optimizing heat distribution and laser control.
Implementation Method 1
a laser beam to sinter or melt a powder material
Implementation Method 2
The physical processes associated with laser sintering or laser melting include heat transfer to a powder material
Implementation Method 3
electron beam melting (EBM) utilizes a focused electron beam to melt powder
Implementation Method 4
sintering entails fusing (agglomerating) particles of a powder at a temperature below the melting point of the powder material
Data Source
AI summary
A scanning technique for the additive manufacturing of an object. The method comprises the irradiation of 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 path bounded by a first stripe, wherein the first irradiation path is formed at an oblique angle with respect to the first stripe. The first irradiation path further comprises at least a first scan vector and a second scan vector at least partially melting a powder and forming a first solidification line and second solidification line respectively, wherein the first solidification intersects and forms an oblique angle with respect to the second solidification line. After a layer is completed, a subsequent layer of powder is provided over the completed layer, and the subsequent layer of powder is irradiated. Irradiation of the subsequent layer of powder follows a second irradiation path bounded by a second stripe. wherein the second irradiation path is formed at an oblique angle with respect to the second stripe. The first irradiation path further comprises at least a third scan vector and a fourth scan vector at least partially melting a powder and forming a third solidification line and fourth solidification line respectively, wherein the third solidification intersects and forms an oblique angle with respect to the fourth solidification line.