3D Printing Control Instructions for Shrinkage Compensation
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Solution Overview
Problem
3D printing by material extrusion (ME) processes face challenges such as shrinkage-induced deformation and internal mechanical stresses due to uneven cooling rates, leading to inaccuracies and mechanical property changes in the printed objects, which existing compensation methods fail to adequately address.
Innovation Solution
A method for generating adapted control instructions that simulate and compensate for thermal and mechanical deformations by using a mesh model to adjust toolpaths and annealing processes, ensuring the printed object's dimensions and shape align with the original model, incorporating spatial compensation and optimized annealing procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ME process is performed at realistic speeds, then productivity is improved, but manufacturing precision deteriorates due to uneven cooling and shrinkage deformation
Solution Approach 1:
The patent applies preliminary action by pre-calculating shrinkage compensation values and incorporating them into the toolpath generation process before printing begins. The system determines compensation amounts based on geometric features, material properties, and process parameters, then adjusts the toolpath accordingly in advance, eliminating the need for post-processing corrections and enabling high-speed printing with maintained precision
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting toolpath parameters such as extrusion rate, travel speed, and compensation amounts based on real-time temperature measurements and predicted shrinkage values. The system modifies these parameters during the printing process to compensate for thermal effects and maintain dimensional accuracy at realistic printing speeds
2Temperature
If the object exterior cools down faster than the inside, then heat release occurs causing isotherms and curvature, but this leads to internal mechanical stresses and deformation
Solution Approach 1:
The patent applies preliminary anti-action by pre-calculating and compensating for thermal gradients and shrinkage forces before they cause deformation. The system predicts temperature distribution and stress patterns, then adjusts the toolpath and process parameters in advance to counteract these effects, preventing internal stresses and deformation rather than correcting them afterward
Solution Approach 2:
The patent implements feedback by measuring actual temperature distribution during printing using sensors, comparing these measurements with predicted values, and adjusting process parameters in real-time to maintain uniform cooling rates. This closed-loop control prevents thermal gradients from developing to levels that would cause internal stresses and deformation
3Manufacturing precision
If existing compensation methods are used, then some deformation is addressed, but they fail to adequately compensate for shrinkage-induced deformation and internal stresses
Solution Approach 1:
The patent applies segmentation by dividing the object into discrete elements or regions, each with its own predicted shrinkage and stress characteristics. The system calculates compensation values for each segment based on local geometry, material properties, and thermal history, then applies these compensations individually to the toolpath, providing more accurate and reliable deformation compensation than global compensation methods
Solution Approach 2:
The patent employs composite materials by combining multiple compensation strategies including geometric compensation, process parameter adjustment, and real-time temperature-based feedback. This multi-faceted approach creates a composite compensation system that addresses various sources of deformation and stress simultaneously, significantly improving compensation effectiveness and reliability
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
The method effectively compensates for shrinkage and deformation, resulting in printed objects that closely resemble the original 3D model, with improved mechanical properties and reduced residual stress, thereby enhancing the accuracy and reliability of the ME process.
Implementation Method 1
the density of the material increases with decreasing temperature. Therefore, the object shrinks
Implementation Method 2
the exterior of the object to be manufactured cools down faster than the inside. This causes heat to be trapped inside the printed object
Implementation Method 3
simulating an annealing process after simulating the ME process
Data Source
Figure 1A~1B
Figure 2~3A
Figure 3B~3C
AI summary
Method and system arranged for obtaining an electronic 3D model of a 3D object to be fabricated. The method further comprising generating control instructions based on said electronic 3D model and process parameters of said fabrication process, determining a mesh model representing said electronic 3D model, the mesh model comprising elements each having at least one property that is affectable by at least one of said process parameters, and performing simulation of said fabrication process in time using said control instructions, said mesh model and said process parameters. The simulation comprises establishing a deviation of said at least one property relative to a reference thereof for each element of the mesh model, wherein said deviation is induced by at least one of said process parameters, and establishing an adaptation for said at least one property of said each element of the mesh model to compensate for said deviation. Said adaptation is applied to said process of generating control instructions to obtain at least one adapted control instruction.