Hybrid Additive Manufacturing Nozzle Thermal Segmentation
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Solution Overview
Problem
Fused Deposition Modeling (FDM) printers face limitations in medium to high volume production due to non-uniform heating and movement-related printing defects, such as stringing and clumping, caused by inadequate nozzle heating and thermal mass issues, which affect printing speed, quality, and efficiency.
Innovation Solution
A hybrid additive manufacturing nozzle combining a high thermal mass area for sustained heating and a low thermal mass area for rapid temperature adjustments, allowing for precise control and improved temperature tolerances, thereby addressing the limitations of existing nozzles by providing high heating energy and quick temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high thermal mass heater is used to provide sufficient heating energy for high print rates, then the heating capability is improved, but the temperature responsiveness and control precision deteriorate due to slow heating rates and broad temperature tolerances
Solution Approach 1:
The heater is divided into two distinct segments: a high thermal mass heater (first heater) and a low thermal mass heater (second heater). Each segment serves a specific function - the first provides substantial heating energy for high print rates, while the second enables rapid temperature adjustments and precise control. This segmentation resolves the contradiction by distributing the heating functions across two specialized components rather than relying on a single heater that must compromise between power and precision.
Solution Approach 2:
Different portions of the heating system are given different thermal mass properties tailored to their specific functions. The first heater portion has high thermal mass optimized for sustained high-power heating, while the second heater portion has low thermal mass optimized for rapid response and precise temperature control. This local differentiation of quality allows each region to excel at its intended function without being constrained by the requirements of the other.
2Manufacturing precision
If a low thermal mass heater is used to achieve rapid temperature changes and tight temperature tolerances, then the temperature responsiveness is improved, but the heating energy capability deteriorates due to insufficient heating power for high print rates
Solution Approach 1:
The heating system is segmented into two functional units with distinct thermal mass characteristics. The low thermal mass second heater is specifically designed for rapid temperature adjustments and maintaining tight tolerances, while the high thermal mass first heater handles the bulk heating requirements. This segmentation allows the low thermal mass portion to perform its precision function without being burdened by the high energy requirements of the first heater.
Solution Approach 2:
The patent combines two heater systems with opposite thermal mass characteristics into a single integrated heating system. The first heater (high thermal mass) and second heater (low thermal mass) work together as a unified system, with the controller coordinating their operation. This merging allows the system to simultaneously achieve both high heating power and rapid temperature responsiveness that neither heater could achieve alone.
3Productivity
If the nozzle is moved at high speed to comply with print plan requirements, then the productivity is improved, but printing defects such as stringing and clumping occur due to inadequate material liquefaction
Solution Approach 1:
The high thermal mass first heater continuously maintains the print material in a properly liquefied state before extrusion, ensuring the material is fully prepared for high-speed deposition. This preliminary heating action prevents stringing and clumping by ensuring adequate material liquefaction occurs in advance, allowing the system to move at high speeds without compromising print quality.
Solution Approach 2:
The dual heater system provides continuous and sustained heating action through the high thermal mass first heater, which maintains stable material liquefaction over extended periods. This continuous heating ensures that even during high-speed printing operations, the material remains properly prepared for extrusion without interruption or degradation, thereby maintaining both productivity and print quality.
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 hybrid nozzle enables faster print rates with reduced temperature overshoot, improved print plan compliance, and enhanced precision, allowing for more complex builds at higher speeds while maintaining stability and reducing defects like die swell and material buildup.
Implementation Method 1
A hybrid print nozzle for additive manufacturing includes a lower portion with a high thermal mass heater
Implementation Method 2
a lower portion with a low thermal mass heater different from the high thermal mass heater
Implementation Method 3
the FDM printer nozzle heats the thermoplastic print filament received to a semi-liquid state
Data Source
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AI summary
An additive manufacturing apparatus, system, and method. The apparatus, system and method are for a hybrid additive manufacturing print nozzle that may include a delivery conduit; an extruder capable of extruding print material through the delivery conduit; a high thermal mass heater about the delivery conduit proximate to the extruder; a low thermal mass heater about the delivery conduit distal from the extruder and proximate to an exit from the delivery conduit; and a controller capable of executing at least a print build using the print material, and of controlling both the high thermal mass heater and the lower thermal mass heater.