Stereolithography Apparatus with Auto Offload Cart and Dual Vat
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Solution Overview
Problem
Current stereolithography systems require significant human intervention and are inefficient in producing multiple three-dimensional objects sequentially, as they need operator attendance for each build, leading to reduced productivity and precision.
Innovation Solution
The system enables unattended building of multiple three-dimensional objects using a dual-chamber housing with automated components, including an elevator, auto off-load cart, and computer-controlled recoater assembly, which allows for simultaneous builds in multiple vats with precise resin level control and RFID identification to maintain resin integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional RP&M systems are used with operator attendance for each build, then human intervention ensures operational control, but productivity is reduced due to significant human intervention requirements
Solution Approach 1:
The system enables unattended operation through self-service mechanisms including an automatic off-load cart that removes completed builds from the vat, an automatic recoater that replenishes resin layers, and computer-controlled systems that manage the entire stereolithography process without human intervention, allowing the system to service itself between builds
Solution Approach 2:
The system performs preliminary actions by pre-positioning the off-load cart and recoater mechanisms before builds begin, pre-programming computer control sequences for unattended operation, and pre-preparing resin reservoirs and build platforms to enable continuous unattended operation across multiple builds
2Productivity
If conventional systems require operator attendance for each build, then operational precision can be maintained, but efficiency is reduced due to reduced productivity
Solution Approach 1:
The system incorporates feedback mechanisms through computer control that continuously monitors build progress, resin levels, and system parameters, automatically adjusting operations to maintain precision specifications without human intervention, ensuring that unattended builds meet the same quality standards as attended builds
Solution Approach 2:
The system replaces manual mechanical operations with automated mechanical and computer-controlled systems, including automated platform positioning, laser control, and resin dispensing mechanisms that maintain precision through programmed control rather than human operator skill
3Productivity
If unattended sequential builds are implemented, then productivity increases by allowing multiple objects to be built simultaneously, but system complexity increases due to automated components
Solution Approach 1:
The system divides functionality into separate modular components including the off-load cart, recoater assembly, computer control system, and stereolithography vat, allowing each component to perform its specific function independently and be maintained or replaced separately, thus managing complexity through functional segmentation
4Productivity
If multiple vats are used for simultaneous builds, then productivity increases through parallel production, but device complexity increases due to dual-chamber housing and multiple components
Solution Approach 1:
The system merges multiple stereolithography vats and build chambers into a single integrated dual-chamber housing structure, allowing parallel builds to occur simultaneously while sharing common support infrastructure, thus increasing productivity without proportionally increasing overall system complexity
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 solution increases productivity by allowing unattended sequential builds, reduces human intervention, and enhances precision through automated processes, enabling the production of multiple objects with improved accuracy and efficiency.
Implementation Method 1
Stereolithography builds solid images from thin layers of polymerizable liquid, commonly referred to as resin... An ultraviolet laser generates a small and intense spot of light that is moved across the liquid surface... The laser cures selected portions of liquid resin at the working surface
Implementation Method 2
Excess liquid resin runs off to level the resin by gravity to a single layer thickness
Data Source
AI summary
A stereolithography apparatus having a resin vat with resupply containers in one-way flow communication and a leveling container in two-way flow communication, an automatic offload cart to remove and replace build support platforms, an elevator assembly for supporting and releasably retaining a build platform removably attached to the stereolithography apparatus frame such that elevator forks supporting the build platform can be released into the vat and removed from the stereolithography apparatus with the vat, and a recoater assembly and recoater blade for mapping the resin surface in the vat and applying a fresh coating of resin to a cross-section being built in the vat.