Variable Extruder Head with Shape Memory Alloy Nozzles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional 3D material extrusion printers face limitations in printing complex non-planar shapes and objects with concave or convex surfaces due to fixed nozzle configurations, which restricts their ability to achieve high resolution and efficient build times.
Innovation Solution
The implementation of a variable extruder head with multiple nozzles of varying diameters and angles, actuated by shape memory alloys, allows for dynamic adjustment of nozzle profiles to accommodate different features and shapes, enabling improved resolution and build rate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed nozzle configuration is used, then the device structure is simple, but the manufacturing precision and adaptability are limited
Solution Approach 1:
The patent implements a variable nozzle system where the nozzle diameter can be dynamically changed during the printing process. This allows the system to adapt nozzle size to match feature requirements, improving manufacturing precision for different geometries without requiring multiple fixed nozzles. The dynamic adjustment capability resolves the contradiction by making the nozzle configuration adaptable rather than static.
Solution Approach 2:
The system changes the physical parameter of nozzle diameter dynamically during operation. By adjusting the nozzle diameter parameter to match the size of features being printed, the system achieves higher manufacturing precision for both small and large features. This parameter change approach allows a single nozzle to perform multiple functions that would otherwise require multiple fixed nozzles.
2Adaptability or versatility
If a single nozzle size is used, then the device complexity is low, but the adaptability to different features is poor
Solution Approach 1:
The variable nozzle system enables a single nozzle to perform multiple functions by changing its diameter. The same nozzle can print both fine details and larger features by adjusting its opening size, making it universal rather than specialized. This multi-functionality approach improves adaptability without requiring a complex array of different nozzles.
Solution Approach 2:
The nozzle diameter is made dynamic rather than static, allowing the system to adapt to different feature sizes during the printing process. This dynamic adjustment capability provides versatility for printing various geometries with a single configurable nozzle, resolving the contradiction between adaptability and device complexity.
3Manufacturing precision
If a small nozzle diameter is used, then the manufacturing precision is high, but the productivity decreases
Solution Approach 1:
The system dynamically adjusts nozzle diameter based on the features being printed. When small, detailed features are being printed, the nozzle diameter is reduced to improve precision. When printing larger areas or less critical features, the nozzle diameter is increased to deposit material faster. This dynamic adaptation resolves the contradiction by optimizing for precision only when necessary.
Solution Approach 2:
The nozzle diameter parameter is changed dynamically during the printing process based on feature requirements. For high-precision features, the parameter is set to a smaller value. For non-critical or large-area features, the parameter is increased to improve deposition speed. This parameter optimization resolves the trade-off between precision and productivity.
4Productivity
If a large nozzle diameter is used, then the productivity is high, but the manufacturing precision deteriorates
Solution Approach 1:
The nozzle diameter is dynamically adjusted during printing based on the criticality and size of features. For non-critical or large-area regions, a larger nozzle diameter is used to maximize deposition speed and productivity. For critical detailed features, the nozzle diameter is reduced to ensure precision. This dynamic control resolves the contradiction between build rate and rendering accuracy.
Solution Approach 2:
The system optimizes the nozzle diameter parameter by printing section by section, adjusting the parameter to match local feature requirements. This localized parameter optimization allows large nozzles to be used where productivity is prioritized while small nozzles are used where precision is critical, resolving the trade-off between build rate and rendering accuracy.
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 enhances the capability to print complex shapes with increased accuracy and reduced build time by allowing independent control of nozzle diameter and orientation, optimizing both resolution and build efficiency for diverse object geometries.
Implementation Method 1
The actuator is coupled to the 3-D print applicator. Responsive to an indication from the sensor and based on the received instructions, the actuator is configured to replace the first removable nozzle with a second removable nozzle having a second profile.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
Apparatus and methods for additive manufacturing with variable extruder profiles are described herein. An extruder print head with multiple nozzles placed at different angles allows for additional degrees of freedom to additively manufacture parts with complex shapes. In addition with the use of shape memory alloy materials, the diameter of one or more nozzles can be adjusted during the additive manufacturing process. This allows for independent control of the build resolution and of the build rate.