Nebulizer Mist Smoothing for Additive-Manufactured Object Surfaces
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Solution Overview
Problem
Additive manufacturing processes, such as FDM or FFF, result in objects with rough surfaces that are aesthetically unappealing and difficult to finish, and have stress concentrators that reduce mechanical properties, requiring labor-intensive and potentially hazardous methods to smooth.
Innovation Solution
An apparatus and method using a nebulizer assembly to generate a mist from a liquid, which surrounds the object to smooth the surface without heating, using thermoplastic polymers and solvents like alcohols, with a vibrating element and mesh to create micro droplets for uniform smoothing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sanding or abrasive techniques are used to smooth the surface, then surface roughness is reduced, but the process becomes labor-intensive and potentially hazardous
Solution Approach 1:
The patent replaces mechanical sanding and abrasive techniques with a chemical vapor smoothing process. A solvent reservoir releases vapor that chemically interacts with the thermoplastic surface to smooth it, eliminating the need for manual sanding operations and their associated labor intensiveness and safety hazards.
Solution Approach 2:
The patent changes the state of the solvent from liquid to vapor phase to achieve surface smoothing. By controlling the temperature and concentration of the solvent vapor, the process achieves effective surface smoothing without requiring direct mechanical contact or abrasive materials.
2Manufacturing precision
If heating is used to smooth the surface, then surface smoothness is improved, but the object may deform
Solution Approach 1:
The patent substitutes thermal heating with chemical vapor interaction. Instead of applying heat that could cause warping or deformation, the solvent vapor chemically interacts with the thermoplastic surface at or near room temperature, achieving smoothing without compromising the object's dimensional stability or shape.
3Manufacturing precision
If vapor smoothing is used to reduce surface roughness, then surface quality is improved, but liquid consumption increases
Solution Approach 1:
The patent utilizes the phase transition of the solvent from liquid to vapor. The solvent is heated to generate vapor that rises and contacts the object surface, providing smoothing action. After the process, the vapor condenses back to liquid and is collected and reused, minimizing overall consumption.
Solution Approach 2:
The patent implements a vapor recovery system where solvent vapor that does not contact the object or excess vapor is condensed back to liquid form and returned to the reservoir. This recycling approach significantly reduces the amount of solvent that would otherwise be wasted.
4Manufacturing precision
If traditional smoothing methods are used, then surface roughness is reduced, but processing time is excessive
Solution Approach 1:
The patent employs continuous vapor generation and circulation throughout the processing chamber, ensuring that the object surface is constantly exposed to smoothing vapor. This continuous action achieves effective surface smoothing in 10-60 minutes, compared to much longer times required for manual sanding or multiple abrasive passes.
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 method achieves a smooth and shiny surface without deforming the object, reducing roughness in 10-60 minutes, allowing multiple objects to be processed simultaneously with minimal liquid consumption and no health risks, maintaining the object's shape and form.
Implementation Method 1
A nebulizer assembly vibrates a liquid against a mesh to generate a mist that smoothly surrounds an object placed in the chamber.
Implementation Method 2
generate a mist by a nebulizer assembly from a liquid held in a reservoir into the chamber
Implementation Method 3
The wick may be made of a material that does not substantially dissolve in or react with the liquid
Implementation Method 4
Many of the materials used in FDM ® printing are soluble or partially soluble in various liquids, including alcohols, ethers, esters, and ketones
Implementation Method 5
The mist may include micro droplets whose diameters range from 5 μm to 100 μm
Data Source
Figure 1A~1D
Figure 2
Figure 3A~3B
AI summary
Embodiments of the disclosure are directed to an apparatus (200) for smoothing a surface of an object (100). The apparatus (200) includes a chamber (210), a reservoir (216, 324) configured to hold a liquid (322), and a nebulizer assembly (212) configured to generate a mist (104) from the liquid (322) into the chamber (210). The nebulizer assembly (212) includes a mesh (732), a vibrating element (731), and a wick (736). The object (100) is received in the chamber (210) and the mist (104) is configured to surround the object (100).