Hybrid 3D Printing for High-Strength Objects
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Solution Overview
Problem
Existing 3D printing methods using UV networkable polymers face limitations in mechanical strength and surface accuracy due to the use of low-viscosity polymers and the complexity of multi-material processes, which results in objects with compromised mechanical properties and surface quality.
Innovation Solution
A hybrid 3D printing procedure that employs different printing processes for materials with varying properties, utilizing a low-viscosity first material for creating a negative form and a thermoplastic powder-based second material for building the object, which is then sintered to achieve high mechanical strength and surface accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If UV-curable polymers with low viscosity are used for inkjet printing, then printing resolution and surface quality are improved, but mechanical strength and durability of the molded object deteriorate
Solution Approach 1:
The molded object is divided into two distinct material components: a first material (UV-curable polymer) for creating the negative mold and a second material (thermoplastic powder) for forming the final object. This segmentation allows each material to be optimized for its specific function - the first material provides printing resolution while the second material provides mechanical strength
Solution Approach 2:
The first material serving as the negative mold is extracted and removed from the final product through dissolution in a solvent. This extraction eliminates the weak UV-curable polymer from the final object, leaving only the strong thermoplastic powder structure, thereby resolving the contradiction between printing resolution and mechanical strength
2Adaptability or versatility
If a multi-material process with three different materials is used, then functional requirements are better met, but process complexity increases
Solution Approach 1:
One material (the first material/negative mold) is extracted and removed after serving its purpose. This reduces the final object to two materials while maintaining the ability to meet functional requirements during the manufacturing process, thereby reducing complexity
Solution Approach 2:
Different materials are applied with different properties to different locations - the first material is applied only where negative mold structure is needed, and the second material is applied where the final object structure is needed. This local differentiation allows functional versatility without requiring all three materials throughout the entire process
3Ease of operation
If low-viscosity polymers are used for inkjet printing, then jetability and printing resolution are improved, but mechanical stability and durability of the object deteriorate
Solution Approach 1:
The material system is segmented into a first material optimized for jetability (low-viscosity UV-curable polymer) and a second material optimized for mechanical stability (thermoplastic powder). The first material's ease of operation is achieved without compromising the second material's reliability
Solution Approach 2:
The first material that provides ease of operation (jetability) is extracted and removed after manufacturing. This allows the use of low-viscosity polymers for printing without the penalty of reduced mechanical stability in the final product, since the weak material is removed and only the strong thermoplastic remains
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 enables the precise and efficient production of 3D objects with high mechanical stability, surface accuracy, and long-term stability, overcoming the limitations of existing methods by ensuring 100% control over shape and material properties.
Implementation Method 1
liquid polymers which can be solidified by exposure to ultraviolet radiation
Implementation Method 2
a powdery second material, preferably comprising thermoplastic powder particles
Data Source
Figure 1
Figure 2A~2C
Figure 2D~2F
AI summary
In a method for producing a molded three-dimensional object using a layer-by-layer material application, a base surface (3) for receiving the molded three-dimensional object, a liquid, flowable, or pulverulent first material (4) which can be solidified, a second material (5) which comprises pulverulent thermoplastic powder particles, and a solvent (33) are provided. A negative mold layer (12) with a cavity (13) for a molded object layer (16) to be produced is made from the first material, and the negative mold layer is solidified. The base of the cavity (13) is charged to an electric potential of a first polarity, and the powder particles are charged to a potential of a second polarity. The powder particles are applied onto a support surface which is positioned relative to the cavity (13) such that the powder particles are transferred from the support surface into the cavity (13) and, in the cavity, form a molded object layer (16) with a positive mold which matches the negative mold. The molded object layer (16) is sintered by applying heat. A flat surface is produced by removing material, said surface extending over the negative mold layer (12) and the molded object layer (16). The aforementioned steps are repeated at least once. The negative mold layers (12) are then released in the solvent.