Wear-Resistant Nozzle for Abrasive 3D Printing Composites
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Solution Overview
Problem
Current three-dimensional printing methods using composite materials face challenges in producing durable parts with high resolution and UV stability, particularly in Stereolithography (SLA) and Fused Filament Fabrication (FFF), which lack durability and are not suitable for long-term applications.
Innovation Solution
A three-dimensional printer is designed to print parts using a composite material with a thermoplastic matrix and chopped fiber filler, where the nozzle is made from materials with high thermal conductivity and Rockwell C hardness, enabling efficient heat transfer and wear resistance, and a method for additively manufacturing parts with reinforced axial fiber filaments and dispersed fiber rods to enhance mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SLA or FFF methods are used to print composite parts, then the parts can be produced with high resolution or ease of manufacture, but the parts lack durability and UV stability
Solution Approach 1:
The patent uses a composite material consisting of a thermoplastic matrix with chopped fiber filler (such as carbon fiber) to create parts that combine the ease of 3D printing with enhanced mechanical properties and durability. The composite material allows the part to maintain manufacturability through standard FFF processes while gaining improved strength and environmental resistance from the fiber reinforcement.
Solution Approach 2:
The patent modifies the material parameters by incorporating fibers with specific hardness (more than two times the hardness of the thermoplastic matrix) and using high thermal conductivity materials (at least substantially 35 w/M-K) for the nozzle to enable efficient heat transfer during printing, thereby achieving durable parts through parameter optimization rather than fundamental process changes.
2Reliability
If a standard nozzle is used to deposit composite material, then the printing process is simple, but the nozzle wears quickly due to abrasion from chopped fiber filler
Solution Approach 1:
The patent applies local quality by making only the nozzle tip (the specific region subject to wear) from a highly wear-resistant material with Rockwell C hardness of at least substantially C40, while the rest of the nozzle body can be made from different materials. This localized application of high-hardness material protects against abrasion from chopped fibers without requiring the entire nozzle assembly to be complex or expensive.
Solution Approach 2:
The nozzle itself is made from a composite or composite-compatible material that combines high thermal conductivity (at least substantially 35 w/M-K) for efficient heat transfer with high hardness (Rockwell C hardness at least substantially C40 for the tip) for wear resistance, allowing it to withstand the abrasive composite material while maintaining printing functionality.
3Reliability
If high hardness material is used for the nozzle tip, then wear resistance is improved, but heat transfer efficiency may be reduced
Solution Approach 1:
The patent carefully selects materials and specifies parameter ranges where both hardness and thermal conductivity are sufficiently high. By requiring the nozzle material to have thermal conductivity of at least substantially 35 w/M-K and the tip to have Rockwell C hardness of at least substantially C40, the patent identifies a parameter space where wear resistance and heat transfer efficiency are simultaneously satisfied, resolving the apparent contradiction between these two properties.
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 printer produces parts with significantly improved hardness and durability, capable of withstanding environmental factors like UV exposure, and achieves enhanced mechanical properties through the strategic deposition of fiber reinforcements, addressing the limitations of existing methods.
Implementation Method 1
The heated nozzle includes a nozzle body through which heat is applied to the composite material, the nozzle body being formed from a material having a thermal conductivity of at least substantially 35 w/M-K
Implementation Method 2
An exterior nozzle tip that contacts and rubs against a top surface of a previously deposited part and is abraded by the chopped fiber filler may be formed from a material having a Rockwell C hardness at least substantially C40
Data Source
AI summary
A three dimensional printer which prints at using at least one composite material having an inherently abrasive filler or fiber material has a Mohs hardness greater than substantially 1, or a Knoop/Vickers hardness greater than substantially 300 kg/mm2, or a Rockwell C hardness at least C30, and where a nozzle tip may contact a top surface of a previously deposited line of material may have a nozzle body includes a material having a thermal conductivity at least 35 w/M-K to conduct heat to the nozzle, and a nozzle throat and/or nozzle tip each include a material having a Rockwell C hardness at least C40, to resist wear from sliding contact of the nozzle tip with the previously deposited lines of the material being printed or another previously deposited material, or from the material being printed as it is printed through the nozzle throat.