Active Valve for Mixing and Dispensing Control in Additive Manufacturing
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Solution Overview
Problem
Current additive manufacturing systems face challenges in handling a wide range of materials, particularly those with varying viscosities and particle-loaded materials, and struggle with achieving clean starts and stops, which are critical for fine feature and high-resolution prints.
Innovation Solution
The system incorporates a material combiner chamber with a valve having a mixing rod that can be moved and spun to mix and dispense materials in real-time, featuring pressure sensors and valves for precise control, allowing for clean starts and stops, and a controller to manage the mixing and dispensing process, including the ability to handle materials from low to high viscosity and particle-loaded materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple 3D printers or re-configurable pumps are used to handle different materials, then material versatility is improved, but system complexity and manufacturing time increase
Solution Approach 1:
The patent implements a single 3D printing system capable of handling multiple material types (low viscosity, high viscosity, and particle-loaded materials) through a universal material feed system with adjustable pumping mechanisms, eliminating the need for multiple specialized printers while maintaining real-time manufacturing capability
Solution Approach 2:
The system employs dynamically adjustable pumping mechanisms and flow control valves that can adapt their operation in real-time based on material properties, allowing the same hardware to efficiently handle varying material viscosities and compositions without reconfiguration or stopping the printing process
2Manufacturing precision
If conventional dispensing systems are used, then system simplicity is maintained, but clean starts and stops cannot be achieved
Solution Approach 1:
The system performs preliminary actions by precisely controlling material flow initiation and termination through electronically controlled valves and pumping mechanisms, ensuring clean starts and stops without extruding unwanted material, which is critical for high-resolution printing
Solution Approach 2:
The patent incorporates feedback mechanisms through pressure sensors and flow monitoring that continuously track material dispensing, allowing the control system to make real-time adjustments to valve positioning and pumping rates to achieve precise start/stop control and maintain print quality
3Manufacturing precision
If material flow is controlled closer to the pen tip, then print quality is improved, but control system complexity increases
Solution Approach 1:
The control system is segmented into multiple independent components (material feed system, combiner chamber, valve assembly, and pen tip) that can be controlled individually, allowing precise flow regulation at the pen tip while maintaining overall system manageability through modular architecture
Solution Approach 2:
The patent introduces an intermediary valve and actuator system positioned between the material source and pen tip that serves as a control mediator, enabling precise flow regulation close to the dispensing point while isolating the complexity from the main printing 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
This solution enables the handling of diverse materials, ensures clean starts and stops, and allows for the creation of gradient patterns, improving the ease and control of the 3D printing process, resulting in higher quality prints with reduced material waste and improved resolution.
Implementation Method 1
a first actuator for moving the rod back and forth along a longitudinal axis to open and close the first seal
Implementation Method 2
a second actuator operatively connected to the rod for spinning the rod
Implementation Method 3
a first pressure sensor associated with the first material feed and a second pressure sensor associated with the second material feed, the first pressure sensor and the second pressure sensor both operatively connected to the controller for providing sensor data to the controller
Implementation Method 4
The first material may chemically react with the second material when mixed within the material combiner chamber
Data Source
AI summary
An assembly for performing an additive manufacturing process includes a first material feed for dispensing a first material, a second material feed for dispensing a second material, a material combiner chamber, a first entry channel fluidly connecting the first material feed and the material combiner chamber, and a second entry channel fluidly connecting the second material feed and the material combiner chamber. The assembly further includes a pen tip for dispensing a material in the additive manufacturing process, the material comprising the first material and the second material, a valve having a rod, a first seal between the material combiner and the pen tip, and a first actuator for moving the rod back and forth along a longitudinal axis to open and close the first seal.