Additive Manufacturing Nozzle Movement System with Belt Assembly
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Solution Overview
Problem
Additive manufacturing machines face issues with molten filament leakage at the nozzle tip, inefficient cooling of deposited filament, and instability in nozzle and print plate movements, leading to inaccuracies, increased print time, and material wastage.
Innovation Solution
A movement system for the nozzle and print plate using a belt assembly with gears and bearings for stable movement, and an integrated cooling system with a cooler, blower, and delivery duct to rapidly cool the molten filament, along with a carriage system for enhanced stability and reduced leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the filament is retracted to reduce leakage of molten filament at the nozzle tip, then leakage is reduced, but the time involved to retract and then extrude the filament increases, thereby increasing the print time
Solution Approach 1:
The system performs preliminary cooling of the molten filament immediately after deposition before the nozzle moves away. The cooling air is directed at the deposited filament to rapidly reduce its temperature and viscosity, causing it to solidify in place. This eliminates the need to retract the filament to prevent leakage, as the filament solidifies where it is deposited. The cooling mechanism is activated in advance and continues during the movement phase, enabling continuous operation without retraction.
2Temperature
If cool air is blown towards the print plate to cool the molten filament, then cooling is achieved, but the cool air flows in all directions and is not localised, resulting in slow cooling and requiring more cool air to be pumped in
Solution Approach 1:
The cooling system uses a directed airflow approach where cool air is channeled through specific openings in the print plate structure, positioning it directly at the deposition location. The cooling air flow is concentrated and directed downward onto the molten filament, creating a localized cooling zone rather than ambient cooling. This targeted approach increases cooling efficiency and reduces the total volume of cool air required compared to general air circulation methods.
3Ease of operation
If conventional belt assemblies are used to move the nozzle and print plate, then movement is achieved, but the belt assemblies tend to lose tension, resulting in flawed printing
Solution Approach 1:
The system replaces conventional belt-driven movement mechanisms with a direct linear motion system using linear guides and linear motors. The linear guides provide rigid, precise movement paths for both the print plate and nozzle assembly, eliminating the tension loss and sagging issues inherent in belt systems. This mechanical substitution maintains ease of operation while significantly improving positioning accuracy and printing stability through rigid guidance and active motor control.
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 solution reduces filament leakage, enhances cooling efficiency, and improves the stability and accuracy of the printing process, thereby reducing material wastage and print time while maintaining mechanical performance.
Implementation Method 1
a cooler (802) to cool the air
Implementation Method 2
a blower (804) to move the air towards the print plate
Implementation Method 3
cool air blown towards the print plate, flows in all directions and is not localised. This results in slow cooling of the molten filament
Data Source
AI summary
A movement system for achieving movement of at least a nozzle assembly in an additive manufacturing machine is provided. The movement system comprises a first tower and a belt assembly. The first tower is configured to move back and forth along a first axis. The belt assembly is configured to enable the back and forth movement of the first tower along the first axis. The belt assembly comprises a belt, a gear and at least two bearings. The belt interfaces with the gear and the two bearings, with one bearing on each side of the gear, such that the belt is sandwiched between the gear and the bearings. The belt is engaged to the first tower. Rotation of the gear results in movement of the belt, and thereby the first tower, along the first axis.