Optical Projection 3D Printing for Precise Multi-Material Placement
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Solution Overview
Problem
Existing 3D printing technologies are limited to single-material printing, leading to poor printing quality and efficiency due to reliance on nozzle precision and post-processing for coloration and material mixing, with residual materials affecting subsequent layers.
Innovation Solution
A three-dimensional printing apparatus and method that allows for simultaneous supply and precise placement of multiple printing materials using a light-transmissive material carrying mechanism, optical projection, and a forming platform mechanism, with optional leveling and cleaning mechanisms to ensure uniformity and separation of cured layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ink-jet nozzles are used to eject resin of different colors into the material tank, then color printing is enabled, but it is difficult to ensure that the resin flows flat in the material tank, affecting printing precision
Solution Approach 1:
The patent replaces the mechanical ink-jet nozzle system with an optical projection system. Instead of ejecting resin through nozzles and relying on liquid flow, the system uses a projector to project patterns through a light-transmissive material carrying mechanism, causing photo-curable resin to cure directly where light strikes. This substitution eliminates the fluid flow control problems inherent in nozzle-based systems while maintaining the ability to print multiple colors and materials.
Solution Approach 2:
The patent introduces a light-transmissive material carrying mechanism as an intermediary between the resin reservoir and the forming platform. This mechanism carries multiple types of photo-curable resin and allows optical patterns to pass through it, enabling precise control of where different materials are cured without the need for complex nozzle positioning and fluid flow management.
2Adaptability or versatility
If multiple nozzles are disposed on a lateral side of a material tank to eject resin of different colors, then multi-material printing is enabled, but the printing precision heavily depends on the liquid ejecting precision of the nozzles, affecting printing quality
Solution Approach 1:
The patent replaces the multi-nozzle mechanical ejection system with an optical projection system that can project different patterns for different materials. The light-transmissive material carrying mechanism holds multiple resin types, and the projector selectively cures resin in different areas, eliminating dependence on nozzle liquid ejection precision while maintaining multi-material printing capability.
3Device complexity
If conventional photo-curing technology is used with a single material tank, then the apparatus structure is simple, but it can only print parts of single printing material, reducing versatility
Solution Approach 1:
The patent makes the material carrying mechanism multi-functional by enabling it to carry multiple types of photo-curable resin simultaneously. The light-transmissive mechanism serves both as a material carrier and as a projection medium, allowing different resin types to be positioned and cured in different areas according to the projected patterns, thus achieving multi-material printing without significantly increasing overall apparatus complexity.
4Adaptability or versatility
If resin is ejected from the lateral side into the material tank via nozzles, then color printing is achieved, but residual materials affect subsequent layers, requiring post-processing
Solution Approach 1:
The patent replaces the nozzle-based resin ejection system with an optical projection system that cures resin in-place through the light-transmissive material carrying mechanism. This eliminates the lateral resin flow and residual material problems, as each layer is cured directly where needed without leaving residual uncured resin that would affect subsequent layers, thereby eliminating the need for post-processing cleaning steps.
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
Enables multi-material printing with improved precision and reduced material mixing, enhancing printing quality and efficiency by eliminating the need for post-processing and relying on optical projection for edge precision, while reducing material usage and labor costs.
Implementation Method 1
the optical mechanism is configured to project light and expose the printing materials in the carrying area, so that the printing materials are subjected to a photo-curing reaction to form a printing model
Data Source
AI summary
A three-dimensional printing apparatus and a three-dimensional printing method. The three-dimensional printing apparatus includes a material carrying mechanism, a supplying mechanism, a driving mechanism, an optical mechanism and a forming platform mechanism, wherein the material carrying mechanism is provided with a carrying area configured to carry a printing material; the supplying mechanism includes a supplying assembly configured to quantitatively supply a plurality of types of printing materials; and the driving mechanism is configured to realize a relative movement between the carrying area and the supplying assembly, so that the supplying mechanism quantitatively supplies a preset type of printing material at a preset position of the material carrying mechanism.