Dynamic Hob Pinch Force Control for FDM Filament Feed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current FDM print heads in additive manufacturing suffer from material feed issues such as scoring, crimping, and friction due to manual adjustment of hob forces, limiting efficiency and performance, especially in medium to high volume production.
Innovation Solution
An apparatus and method for dynamic hob pinch force adjustment using a motor-driven mechanism with a controller to automate and adjust the force applied between hobs, enabling precise and real-time control of filament feed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual adjustment of hob forces is used, then device complexity is reduced, but manufacturing precision deteriorates due to scoring and crimping of filament
Solution Approach 1:
The patent applies dynamics by transitioning from static manual hob force adjustment to dynamic automated control. The system uses motors to drive hobs with programmable speed and force variations, allowing real-time adaptation of feed parameters based on print requirements, thereby improving filament feed precision without excessive complexity
Solution Approach 2:
The patent implements parameter changes by enabling programmable control of hob rotation speed and applied force. The system can vary these parameters dynamically during printing based on filament type, diameter, and print plan requirements, resolving the precision issue while maintaining manageable device complexity through software control
2Productivity
If higher hob force is applied to increase feed speed, then productivity improves, but reliability deteriorates due to material feed errors
Solution Approach 1:
The patent applies dynamics by enabling real-time adjustment of hob feed speed and force. The system can accelerate filament feed during non-critical sections and reduce speed or force when approaching features requiring precision, thereby maintaining both productivity and reliability through adaptive control
Solution Approach 2:
The patent implements feedback mechanisms that monitor filament feed conditions and adjust hob force and speed accordingly. This closed-loop control prevents material feed errors by detecting anomalies and correcting them, allowing high feed speeds without sacrificing reliability
3Ease of operation
If fixed hob force is used, then ease of operation improves, but adaptability deteriorates for different material types and diameters
Solution Approach 1:
The patent implements parameter changes by providing programmable control of hob rotation speed and applied force. Different material types and diameters can be accommodated by loading appropriate parameter sets, maintaining ease of operation through standardized interfaces while achieving high adaptability to various filaments
Solution Approach 2:
The patent applies universality by designing a multi-functional hob drive system that can handle various filament types, diameters, and print requirements through programmable control. A single system configuration serves multiple functions by adjusting parameters, eliminating the need for manual reconfiguration while maintaining simplicity
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
Enhances printing efficiency and quality by minimizing material feed errors, allowing for optimized hob force adjustments based on material type, diameter, and print plan, improving filament handling and reducing clogging.
Implementation Method 1
the current print material feeds often scores or crimps the filament, and further subjects the print material filament to various undesirable effects, such as compression, friction, and lag
Implementation Method 2
a dynamic force adjustment capable of exerting force on one of the two hobs to urge the force-receiving hob toward the other of the two hobs
Data Source
AI summary
The disclosure is of and includes at least an apparatus, system and method for a print head for additive manufacturing. The apparatus, system and method may include at least two proximate hobs suitable to receive and extrude therebetween a print material filament for the additive manufacturing; a motor capable of imparting a rotation to at least one of the two hobs, wherein the extrusion results from the rotation; a dynamic force adjustment capable of exerting force on one of the two hobs to urge the force-receiving hob toward the other of the two hobs; and a controller communicatively connected with the dynamic force adjustment and capable of controlling the force exertion thereof.