Dynamic Hob Force Control in Additive Manufacturing Print Heads
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Solution Overview
Problem
Current additive manufacturing print heads, particularly in FDM technology, suffer from issues such as scoring, crimping, and friction due to manual adjustment of hob forces, leading to inefficiencies and limitations in printing speed, quality, and efficiency, especially in medium to high volume production.
Innovation Solution
A dynamic force adjustment mechanism is implemented in the print head, utilizing a motor-driven hob system with a controller to automatically and dynamically adjust the force applied between hobs, enabling precise and real-time control of filament feed, minimizing scoring and crimping, and optimizing the printing process.
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
Solution Approach 1:
The patent applies the Dynamics principle by replacing static manual hob force adjustment with a dynamic motor-driven system. The hobs are now driven by motors that can dynamically adjust rotation speed and force based on real-time feedback from encoders and control algorithms, enabling precise filament feed control without manual intervention while maintaining system adaptability.
Solution Approach 2:
The patent implements the Feedback principle through encoder sensors that continuously monitor hob rotation position and filament feed status. This feedback is processed by a controller that adjusts motor drive parameters in real-time to optimize filament feeding, prevent scoring and crimping, and maintain manufacturing precision throughout the printing process.
2Manufacturing precision
If motor-driven hob system with dynamic force adjustment is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent applies the Universality principle by designing the motor-driven hob system to perform multiple functions: driving filament feeding, dynamically adjusting hob force, providing position feedback through encoders, and enabling adaptive control. This multi-functionality consolidates what would otherwise require separate components into an integrated system, managing complexity while enhancing precision.
Solution Approach 2:
The patent implements the Self-service principle through the automated control system that monitors filament feed conditions via encoders and autonomously adjusts motor parameters to optimize performance. The system self-regulates hob force and rotation speed based on real-time feedback, eliminating the need for manual adjustment and maintaining precision without proportionally increasing operational complexity.
3Productivity
If dynamic force adjustment is applied, then productivity is improved through faster printing, but loss of substance increases due to material feed errors
Solution Approach 1:
The patent applies the Continuity principle by ensuring uninterrupted, precise filament feeding through motor-driven hobs with encoder feedback. The system maintains continuous optimal force application during high-speed printing, preventing feed errors and material waste while sustaining high productivity throughout the printing process without interruption or adjustment pauses.
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
The dynamic hob force adjustment enhances printing precision, efficiency, and quality by reducing material feed errors, allowing for seamless transitions in filament handling and adapting to varying materials and print plans, thereby improving overall performance.
Implementation Method 1
two print hobs that are forced into rotational contact in order to extrude the print material
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.