3D Print Exposure Shells for Tolerance and Print Time Balance
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Solution Overview
Problem
In additive manufacturing, existing methods struggle to maintain dimensional tolerances and surface quality in 3D-printed parts due to issues with over-exposure or under-exposure of resin, leading to reduced accuracy and fidelity, as well as increased print time.
Innovation Solution
A method that involves segmenting a 3D part model into layers and defining print images with specific erosion distances and exposure energies to control polymerization, ensuring minimal crosslink density and inter-layer bond strength, while achieving tight dimensional tolerances and surface finishes by incrementally exposing nested shell layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional additive manufacturing methods are used to print 3D parts, then print time is reduced, but dimensional tolerances and surface quality deteriorate due to over-exposure or under-exposure of resin
Solution Approach 1:
The patent segments the part model into multiple nested shell layers, where each shell represents a specific depth range from the surface. This segmentation allows selective exposure of different shell layers with different energy levels, enabling precise control over polymerization depth and reducing both over-exposure and under-exposure issues while maintaining acceptable print times
Solution Approach 2:
The patent applies different exposure energies to different regions of the part based on local requirements. By calculating erosion distances and assigning specific exposure energies to each shell layer, the system ensures that surface regions receive appropriate energy for dimensional accuracy while interior regions receive sufficient energy for complete polymerization, thereby improving overall manufacturing precision without uniformly increasing print time
2Manufacturing precision
If traditional additive manufacturing methods are used to print 3D parts, then print time is reduced, but surface quality deteriorates due to improper resin polymerization
Solution Approach 1:
The patent divides the part into nested shell layers representing different depth zones from the surface. This segmentation enables differential exposure control where surface shells receive optimized exposure energies to achieve proper polymerization and smooth surface finishes, while interior shells receive appropriate energy levels, thereby improving surface quality without proportionally increasing overall print time
Solution Approach 2:
The patent dynamically adjusts exposure energy parameters for each shell layer based on its depth and position. By calculating erosion distances and assigning specific exposure energies to different shells, the system optimizes resin polymerization at each depth level, ensuring high surface finish quality while maintaining efficient print speeds through parameter optimization rather than uniform parameter application
3Manufacturing precision
If erosion distance is increased to improve dimensional accuracy, then manufacturing precision improves, but the complexity of calculating and defining print images increases
Solution Approach 1:
The patent simplifies the complexity of defining print images by segmenting the part into nested shell layers with predefined erosion distances. Each shell layer corresponds to a specific depth range and requires a single erosion distance calculation, breaking down the complex multi-parameter optimization problem into manageable sequential steps that improve dimensional accuracy without overwhelming computational complexity
Solution Approach 2:
The patent performs preliminary calculations of erosion distances and exposure energies before the actual printing process. By pre-defining the shell layers and their corresponding exposure parameters based on the part geometry and material properties, the system reduces the computational complexity during printing while maintaining high dimensional accuracy through pre-optimized parameters
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 dimensional accuracy, surface finish control, and reduces warpage by precisely managing polymerization, thereby improving the overall quality and reliability of 3D-printed parts.
Implementation Method 1
an additive manufacturing system that selectively polymerizes resin layers when exposed to radiation according to print images
Data Source
AI summary
A method for generating print images for additive manufacturing includes: accessing a part model; accessing a set of dimensional tolerances for the part model; and segmenting the part model into a set of model layers. The method also includes, and, for each model layer: detecting an edge in the model layer; assigning a dimensional tolerance to the edge; defining an outer exposure shell inset from the edge by an erosion distance inversely proportional to a width of the dimensional tolerance; defining an inner exposure shell inset from the outer exposure shell and scheduled for exposure separately from the outer exposure shell; defining an a outer exposure energy proportional to the width of the dimensional tolerance and assigned to the outer exposure shell; and defining an inner exposure energy greater than the outer exposure energy and assigned to the inner exposure shell.