Dual-Formulation 3D Printing for Thermal and Impact Balance
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Solution Overview
Problem
Additive manufacturing techniques face challenges in achieving desirable mechanical properties, such as high Heat Deflection Temperature (HDT) without compromising other properties like Izod impact resistance, in three-dimensional objects.
Innovation Solution
A method involving the layerwise fabrication of three-dimensional objects using two distinct modeling formulations, where one formulation provides a high HDT and the other provides high Izod impact resistance, with a specific ratio of elastic moduli and thermal properties, and exposure to curing energy to achieve the desired mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single modeling formulation is used to achieve high HDT, then the Heat Deflection Temperature is improved, but the Izod impact resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining two distinct modeling formulations with different material properties. The first formulation provides high HDT characteristics while the second formulation provides high impact resistance. These formulations are deposited in an interlaced voxel pattern to create a composite structure that achieves both high HDT (at least 100°C) and high Izod impact resistance (at least 100 J/m), resolving the contradiction between thermal stability and mechanical toughness.
Solution Approach 2:
The patent implements local quality by assigning different material formulations to different spatial locations within the same layer. Specifically, voxels are arranged in an interlaced pattern where the first formulation and second formulation are distributed throughout the core region. This local differentiation allows the object to exhibit high HDT in regions dominated by the first formulation while maintaining high impact resistance in regions dominated by the second formulation.
2Strength
If multiple modeling formulations are used to improve mechanical properties, then the thermo-mechanical properties are improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the object into discrete voxels that are selectively assigned different material formulations. The object is constructed layer by layer, with each layer containing an interlaced pattern of voxels from the first and second formulations. This segmentation approach allows independent control of material distribution while using a standardized fabrication process, managing complexity through modular construction.
Solution Approach 2:
The patent utilizes parameter changes by varying the material formulation parameter across different voxels within the same layer. The system controls which formulation (first or second) is deposited in each voxel location based on the desired property distribution. This parameter variation enables tailored thermo-mechanical properties throughout the object without requiring fundamentally different fabrication equipment.
3Stability of the object's composition
If different formulations are deposited in an interlaced pattern, then the structural integrity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies homogeneity by creating a uniform interlaced distribution pattern of the two formulations throughout the object's core region. Rather than random or clustered arrangements, the voxels are systematically interlaced to ensure homogeneous property distribution. This homogeneous structure enhances structural integrity by evenly distributing stress and thermal properties, while the systematic pattern simplifies manufacturing precision requirements compared to random arrangements.
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 results in objects with improved thermo-mechanical properties, including HDT of at least 100°C and Izod impact resistance of at least 100 J/m, while minimizing curling and maintaining structural integrity.
Implementation Method 1
exposing the layer to curing energy
Data Source
AI summary
A method of layerwise fabrication of a three-dimensional object is disclosed. The method comprises, for each of at least a few of the layers: dispensing at least a first modeling formulation and a second modeling formulation to form a core region using both the first and the second modeling formulations, and at least one envelope region at least partially surrounding the core region using one of the first and the second modeling formulations but not the other one of the first and the second modeling formulations. The method can also comprise exposing the layer to curing energy. The first modeling formulation is characterized, when hardened, by heat deflection temperature (HDT) of at least 90° C., and the second modeling formulation is characterized, when hardened, by Izod impact resistance (IR) value of at least 45 J/m.