Dynamic Contour Offset Discretization for Curved-Surface 3D Printing
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Solution Overview
Problem
Traditional 3D printing methods using planar layering and slicing face challenges in achieving precise mechanical performance and surface quality for complex curved-surface components, particularly with continuous fiber-reinforced thermoplastic composite materials, due to inherent interlayer staircase effects and limited layer thickness constraints.
Innovation Solution
A path planning method based on dynamic contour offset discretization for spatial curved-surface printing, which involves identifying shape features, setting layer thickness, classifying contour boundaries, calculating normal vectors, and dynamically adjusting contour offsets to achieve precise spatial path planning for multi-degree-of-freedom printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If planar layering and slicing are adopted in traditional 3D printing, then the three-dimensional model can be reduced to a two-dimensional plane for manufacturing, but the forming precision is greatly affected by interlayer staircase effects and mechanical performance is reduced due to poor interlayer bonding
Solution Approach 1:
The patent applies curved-surface layering instead of planar layering, where the slicing planes follow the curvature of the target model surface. This allows the layers to conform to complex curved geometries, eliminating the staircase effect that occurs with flat slicing planes and improving both forming precision and surface quality.
Solution Approach 2:
The patent dynamically adjusts the layer thickness and slicing orientation based on the local curvature and geometry of the model. Rather than using fixed uniform layers, the system adapts the layer parameters to match the surface characteristics, optimizing both precision and material utilization for each region.
2Manufacturing precision
If layer thickness is reduced to minimize staircase effects in thermoplastic printing, then surface quality improves, but continuous fiber-reinforced composite materials are limited by fixed fiber set values and have greatly limited application scenarios
Solution Approach 1:
The patent changes the fundamental parameter of layer thickness from a fixed small value to a dynamically adjusted value that can vary across different regions of the model. This allows the system to use larger effective layer thicknesses where appropriate for composite materials while maintaining surface quality through curved-surface alignment, thereby expanding material versatility.
3Device complexity
If traditional planar slicing is used for complex curved-surface components, then the manufacturing process remains simple, but dimensional accuracy and mechanical performance are compromised due to interlayer bonding issues
Solution Approach 1:
The patent implements curved-surface layering where slicing planes are oriented perpendicular to the target model surface, following its curvature. This approach maintains relatively simple manufacturing processes while dramatically improving dimensional accuracy and interlayer bonding by ensuring layers conform to the intended geometry rather than creating staircase artifacts.
Data Source
AI summary
A path planning method based on dynamic contour offset discretization and for spatial curved-surface printing is provided. Firstly, transversal equal slicing is carried out on a target model, and single/double contours are labeled; secondly, central slicing is carried out on the model, curvature contours are discretized, feature values of contour offsets of slice layers are calculated on the basis of a surface contour curvature of the model, and dynamic offset filling for inner contours of horizontal slices is realized; then longitudinal equal slicing is carried out on the slices, and spatial discrete points of the target model are obtained; and finally, virtual double contours are constructed for the single contours, and labeling processing for the discrete points is carried out, so that a discretized three-dimensional spatial equidistant lattice of the target model is obtained.