Vibration-Assisted Stereolithography Separation Force Reduction
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Solution Overview
Problem
Constrained surface stereolithography faces challenges in separating newly cured layers from the build surface due to adhesive bonding, leading to high separation forces, especially for parts with large cross-sectional areas, which affects fabrication speed, reliability, and productivity.
Innovation Solution
A vibration-assisted stereolithography process that uses a vibratory source, such as a piezo actuator or audio speaker, to reduce the separation force required by vibrating the constrained surface, allowing for easier separation of the build surface from the constrained surface, particularly effective for large cross-sectional areas without increasing construction complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a constrained surface method is used to increase dimensional accuracy and build speed, then manufacturing precision and productivity are improved, but the separation force required to detach cured layers increases significantly
Solution Approach 1:
The patent applies mechanical vibration to the constrained surface to reduce the separation force required to detach cured layers. The vibration creates dynamic effects that weaken the adhesive bonding between the cured layer and the constrained surface, enabling easier separation while maintaining the benefits of constrained surface methods for dimensional accuracy and build speed.
2Productivity
If the build surface area is increased to accommodate larger parts, then productivity is improved, but the separation force and construction complexity increase
Solution Approach 1:
The vibration mechanism provides a scalable solution that works effectively across different build surface areas. By applying vibration to the constrained surface, the system can handle larger parts and increased build surface areas without proportionally increasing construction complexity, as the vibratory effect distributes the separation force across the entire surface area.
3Ease of operation
If separation force is applied to detach cured layers, then ease of operation is improved, but fabrication time and productivity decrease
Solution Approach 1:
The vibration-assisted separation approach reduces the force required for detachment, making the separation process easier and faster. The vibratory effects dynamically weaken adhesive bonds, allowing for quicker separation compared to applying static separation force, thereby reducing fabrication time while improving ease of operation.
Solution Approach 2:
The periodic vibratory action continuously works to weaken and detach the adhesive bonding between cured layers and the constrained surface. This periodic mechanical action is more efficient than continuous static force application, reducing the time required for separation while maintaining ease of operation.
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
Significantly reduces the required separation force, improving the efficiency and productivity of the 3D printing process for parts with large build surface areas by minimizing the force needed to separate the build surface from the constrained surface, while maintaining the accuracy and quality of the fabricated parts.
Implementation Method 1
a vibratory source configured to vibrate the constrained surface
Data Source
AI summary
A system for additively manufacturing a build part. The system includes a build platform configured for disposition within a resin tank, and a light source configured to cure a layer of resin. The layer of resin is disposed adjacent to a pre-cure build surface of the build part. The system also includes a constrained surface located between the build platform and the light source and configured to form a boundary for the layer of resin disposed between the constrained surface and the pre-cure build surface. The constrained surface is configured to vibrate to reduce a separation force required to separate the constrained surface from a post-cure build surface of the build part. The system also includes a vibratory source configured to vibrate the constrained surface.