Dual-Material Dispensing for Additive Manufacturing Decaking
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Solution Overview
Problem
In 3D printing systems using powdered build materials, the non-solidified support material often absorbs solvents from binding agents, causing it to stick together and complicating the decaking process, especially with metal objects which are fragile before sintering, leading to difficulties in separating the printed object and hindering recycling and throughput.
Innovation Solution
A 3D printing system with a material dispensing apparatus that uses two distinct materials, where the build material and support material are chosen for specific properties, such as solvent absorption and release, and snap-away features to facilitate easier unpacking and recycling, with a dual-material dispensing mechanism and controlled outlet mechanisms to deposit materials precisely and efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-solidified support material is used to support printed parts, then the printed parts can be formed and supported during printing, but the support material absorbs solvents from binding agents causing it to stick together and complicating the decaking process
Solution Approach 1:
The invention uses two distinct materials with different properties: build material for the printed part and support material for the non-solidified support structure. This segmentation allows the support material to be easily separated from the printed part after printing, as they have different characteristics (e.g., magnetic properties, density, or chemical composition) that enable selective removal without damaging the fragile printed object.
Solution Approach 2:
Different regions of the build platform have different material properties: the printed part area uses build material while the support areas use support material. The support material is specifically chosen to have properties that facilitate easy separation (such as being non-magnetic when the printed part is magnetic, or having different particle size/density), allowing localized quality differences that solve the decaking problem.
2Device complexity
If traditional single-material dispensing is used, then the apparatus is simpler, but the decaking process is complicated and damage to printed parts occurs
Solution Approach 1:
The material dispensing apparatus is segmented into multiple dispensing mechanisms, each dedicated to a specific material (build material and support material). This segmentation ensures that each material is deposited with optimal control and properties, preventing contamination and ensuring that the support material maintains its separation-friendly characteristics throughout the printing process, thereby protecting printed part integrity during decaking.
Solution Approach 2:
The support material acts as an intermediary between the build platform and the printed part. It provides temporary support during printing but is designed to be easily removed afterward. The dual-material system creates an intermediary layer that facilitates the printing process while enabling clean separation, reducing direct contact and potential damage between the printed part and the build platform.
3Reliability
If support material absorbs solvents from binding agents, then the binding agent can perform its function, but the support material sticks together and hinders recycling
Solution Approach 1:
The support material is specifically formulated with local quality properties that differ from the build material. It is designed to have low solvent absorption characteristics or different chemical composition that prevents it from absorbing solvents from binding agents, or to have properties that allow easy separation even after solvent exposure. This localized quality difference enables the binding agent to function while the support material remains separable for recycling.
Solution Approach 2:
The invention changes the material parameters of the support material to optimize both binding agent functionality and recyclability. By adjusting properties such as particle size, chemical composition, surface area, or hydrophobicity/hydrophilicity balance, the support material can allow binding agents to perform their function without excessive solvent absorption that would cause clumping, thereby maintaining recycling efficiency.
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 simplifies the decaking process, reduces damage to printed parts, enhances recycling, and improves the efficiency and cost-effectiveness of 3D printing by allowing for optimized material properties and automated unpacking, particularly for metal objects.
Implementation Method 1
The powdered build material may be used by the system to form a three-dimensional printed part on the build platform, such as by fusing particles of build material in layers, whereby the printed part is generated on a layer-by-layer basis.
Implementation Method 2
Each container has an associated outlet mechanism to control dispensing of material from the container.
Data Source
AI summary
In one example, a material dispensing apparatus comprises a plurality of material containers, wherein the plurality of material containers comprises a first set of material containers arranged to contain a first material and a second set of material containers arranged to contain a second, different, material, and each material container of the second set is located relative to a respective material container of the first set to form a pair of material containers. In use, the material dispensing apparatus is controllable to move across a build platform of an additive manufacturing system. Each of the plurality of material containers comprises an outlet mechanism that is independently controllable, relative to outlet mechanisms of others of the plurality of material containers, such that each pair of material containers selectively dispenses at least a portion of a respective amount of material onto a respective portion of the build platform as the material dispensing apparatus moves across the build platform, such that, collectively, the plurality of material containers forms a complete layer of material on the build platform as the material dispensing apparatus performs a single pass across the build platform.