Additive Manufacturing Polyhedral Units Thermal Stress
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Solution Overview
Problem
Metal-laser additive manufacturing faces challenges in ensuring stability and preventing thermal deformation due to uneven thermal stress in 3D objects, despite efforts to disperse thermal stress through scanning methods like stripes and chess scanning.
Innovation Solution
The method involves dividing a 3D digital model into polyhedral units with acute or obtuse angles and cutting it into 2D slices, allowing for even thermal stress dispersion between construction layers by varying scanning vectors, thereby reducing deformation and enhancing axial strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional scanning methods (stripes or chess scanning) are used to disperse thermal stress, then thermal stress concentration is reduced, but thermal stress control still has considerable bottlenecks and deformation cannot be sufficiently prevented
Solution Approach 1:
The 3D digital model is divided into polyhedral 3D units with specific geometric characteristics (acute or obtuse angles), which are then sliced into 2D slices. This segmentation creates alternating scanning directions in adjacent slices, effectively dispersing thermal stress throughout the structure rather than concentrating it in specific layers.
Solution Approach 2:
The patent transitions from conventional 2D slice scanning to 3D polyhedral unit-based scanning. By defining scanning paths that alternate between adjacent 2D slices in different scanning vectors, the method introduces a third-dimensional approach to stress distribution, achieving more uniform thermal stress dispersion across construction layers.
2Productivity
If laser heat is excessively concentrated in metal-laser additive manufacturing, then manufacturing speed may be improved, but thermal deformation of the product occurs
Solution Approach 1:
The patent implements periodic alternation of scanning vectors between adjacent 2D slices. This periodic change in scanning direction creates a rhythm of heat distribution that prevents excessive concentration in any single area, thereby reducing thermal deformation while maintaining manufacturing efficiency.
Solution Approach 2:
Different regions of the 3D object receive different scanning treatments through the polyhedral unit division. Adjacent slices have different scanning vectors, creating local variations in heat input that prevent uniform thermal concentration and reduce overall deformation.
3Manufacturing precision
If polyhedral 3D units with acute or obtuse angles are used for 3D stacking, then thermal stress is evenly dispersed and deformation decreases, but the manufacturing process complexity increases
Solution Approach 1:
The patent employs asymmetric polyhedral 3D units with acute or obtuse angles rather than symmetric shapes. This asymmetry, when combined with alternating scanning vectors in adjacent slices, creates a structured complexity that effectively disperses thermal stress while remaining computationally manageable through systematic generation rules.
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 significantly decreases deformation, improves the quality and stability of 3D objects, and maintains even axial strengths, outperforming conventional scanning strategies by reducing thermal stress accumulation.
Implementation Method 1
providing an energy beam to a material on a working plane along the scanning path to form a construction layer
Implementation Method 2
polyhedral 3D units are adopted to implement 3D stack, so as to evenly disperse the thermal stress between the construction layers
Data Source
AI summary
An additive manufacturing method for a 3D object is provided and includes (a) providing a 3D digital model of the 3D object; (b) dividing the 3D digital model into repeat arrangement of at least one type of polyhedral 3D units and an X-Y plane is an acute angle or an obtuse angle; (c) cutting the 3D digital model along a Z-axis into a plurality of 2D slices; (d) defining a scanning path covering one of the 2D slices; (e) providing an energy beam to a material on a working plane along the scanning path to form a construction layer corresponding to the one of the 2D slices; and (f) repeating the steps (d) and (e) to build up the 3D object by adding a plurality of construction layers in sequence.