Additive Manufacturing Scan Regions for Boundary Heat Control
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Solution Overview
Problem
Current additive manufacturing techniques face challenges in controlling energy density between stripe regions and at boundaries, leading to inefficient heat buildup and potential defects in the final product.
Innovation Solution
The method involves altering energy density by adjusting parameters such as electron beam power, laser power, scan speed, and scan spacing across different scan regions to optimize energy distribution and prevent excessive heat buildup during the additive manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform energy density is applied across all scan regions, then the manufacturing process is simple to control, but excessive heat buildup occurs at stripe boundaries leading to defects
Solution Approach 1:
The patent applies different energy density values to different scan regions: a first energy density for first scan regions, a second energy density for second scan regions, and a third (lower) energy density for third scan regions. This local differentiation prevents excessive heat buildup at stripe boundaries while maintaining manufacturing control through systematic regional parameter assignment.
2Productivity
If high energy density is used to improve build efficiency, then productivity increases, but material defects such as porosity and warping increase
Solution Approach 1:
The patent changes the energy density parameter across different scan regions and layers. By systematically varying energy density values (first, second, and third energy density values) and adjusting laser power, scan speed, and hatch spacing, the process optimizes build efficiency while preventing defects through controlled parameter modulation rather than uniform high energy input.
3Productivity
If laser scan speed is increased to reduce build time, then productivity improves, but energy density decreases leading to poor fusion
Solution Approach 1:
The patent compensates for increased scan speed by adjusting other parameters including laser power and hatch spacing to maintain appropriate energy density. The systematic parameter changes across different regions allow faster scanning while preserving fusion quality through coordinated parameter optimization.
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 build efficiency, reduces material defects, and improves the microstructure of the final product by maintaining consistent energy density across the build area, thereby minimizing warping and porosity issues.
Implementation Method 1
a laser beam to sinter or melt a fine powder
Implementation Method 2
The physical processes associated with laser sintering or laser melting include heat transfer to a powder material
Implementation Method 3
an electron beam or electromagnetic radiation such as a laser beam, to sinter or melt a powder material
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 method, apparatus, and program for additive manufacturing. In one aspect, the method and program comprises forming an at least partially solidified portion within a first scan region by irradiating a build material at a first energy density value along a first irradiation path. A second at least partially solidified portion is formed within a second scan region that is spaced with respect to the first scan region, wherein the solidified portion within the first scan region is formed by irradiation a build material at a second energy density value along a second irradiation path. The space between the first scan region and the second scan region is at least partially solidified by irradiating a build material at a third energy density value that less than the first energy density value and the second energy density value.