3D Shaping Chamber Pressure Control for Resin Layer Temperature
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Solution Overview
Problem
Existing 3D printing techniques face challenges in controlling the temperature of resin layers uniformly, leading to residual stress and reduced interlayer strength in three-dimensional objects, as simply heating the chamber is insufficient to maintain uniform temperature and reduce stress effectively.
Innovation Solution
A three-dimensional shaping method and apparatus that adjusts pressure in the chamber to reduce the natural convection heat transfer coefficient, slowing down the cooling rate of resin layers and maintaining their temperature within a predetermined range, thereby controlling the temperature of the resin layer and ensuring interlayer strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the inside of the chamber is heated to reduce residual stress, then the temperature of the chamber increases, but the temperature of the resin layer cannot be controlled uniformly
Solution Approach 1:
The patent applies local quality by adjusting pressure specifically in the chamber to control heat transfer to the resin layer, rather than uniformly heating the entire chamber. By reducing pressure, the natural convection heat transfer coefficient is reduced, which locally affects the heat transfer to the resin layer surface, allowing better temperature control where needed.
Solution Approach 2:
The patent changes the pressure parameter in the chamber to control the heat transfer process. By adjusting pressure, the natural convection heat transfer coefficient changes, which directly affects the cooling rate of the resin layer. This parameter change allows indirect control of resin layer temperature without directly heating the chamber.
2Speed
If the resin layer is rapidly cooled to solidify it, then the solidification speed increases, but residual stress is generated in the three dimensional object
Solution Approach 1:
The patent changes the pressure parameter to control the heat transfer coefficient, which in turn controls the cooling rate of the resin layer. By reducing pressure, the natural convection heat transfer is reduced, slowing down the cooling rate. This allows the resin layer to solidify at a controlled pace, reducing thermal gradients and minimizing residual stress generation.
3Ease of manufacture
If the resin layer temperature is not controlled, then the manufacturing process is simple, but interlayer strength is reduced
Solution Approach 1:
The patent uses pressure as a control parameter to indirectly control resin layer temperature. Instead of adding complex temperature control systems, the invention changes the pressure parameter which naturally affects the heat transfer coefficient. This maintains relative process simplicity while achieving better temperature control and interlayer strength through the pressure-temperature relationship.
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 effectively reduces residual stress and ensures interlayer strength by maintaining the resin layer temperature within a specific range, enhancing the quality of the three-dimensional objects produced.
Implementation Method 1
the natural convection heat transfer coefficient is reduced by adjusting the pressure in the chamber to reduce the pressure in the chamber
Implementation Method 2
a melting step of melting the resin material
Implementation Method 3
a head unit disposed in the chamber and configured to melt the resin material
Data Source
AI summary
In a three dimensional shaping method and a three dimensional shaping apparatus, when a three dimensional object is obtained by laminating a resin material having thermoplasticity, the resin material is melted, and the melted resin material is laminated in a chamber to form resin layers. Next, the pressure in the chamber is adjusted to maintain the temperature of each of the resin layers within a predetermined temperature range in the chamber.