Surface Smoothing Additively Manufactured Plastic Parts
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Solution Overview
Problem
Additively manufactured plastic molded parts often have rough or porous surfaces that do not meet industrial standards for surface quality, leading to increased wear and aesthetic issues, and existing smoothing methods like mechanical finishing or chemical treatment have limitations, especially with flexible materials and safety concerns for parts in contact with the skin.
Innovation Solution
A method involving a heating step to raise the molded part to a temperature below its melting point, followed by an explosion step where a combustible process gas is ignited to smooth the surface, dissolving or melting the surface without significant material removal, and potentially repeating these steps for enhanced smoothing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical surface finishing processes (grinding/polishing) are used to smooth the surface, then surface roughness is reduced, but material is significantly removed which changes the geometry of the molded part
Solution Approach 1:
The patent replaces mechanical surface finishing processes (grinding, polishing) with a thermal process using short-wave laser radiation. The laser heats the plastic surface to above its melting point, causing the material to melt and resolidify into a smooth surface without significant material removal, thus resolving the contradiction between achieving smooth surfaces and preserving part geometry
Solution Approach 2:
The patent utilizes phase transition of the plastic material by heating it with laser radiation to above the melting point, allowing the surface material to melt and then resolidify. This phase change enables surface smoothing without mechanical contact and significant material removal, addressing both the need for smooth surfaces and geometry preservation
2Manufacturing precision
If acid or solvent vaporization is used to smooth the surface, then pores are closed and surface is smoothed, but harmful substances may be trapped in the pores and released during use, especially concerning parts in contact with skin
Solution Approach 1:
The patent replaces chemical surface treatment methods (acid or solvent vaporization) with a physical thermal process using laser radiation. The laser heats and melts the plastic surface, closing pores through melting rather than chemical dissolution, thereby eliminating the risk of trapping harmful chemical substances while achieving the desired surface smoothing effect
Solution Approach 2:
The patent converts the potentially harmful effect of high-energy laser radiation into a beneficial process by precisely controlling the laser parameters to melt only the surface layer. The high energy is directed specifically at the surface to achieve smoothing without penetrating deeply enough to cause damage, thus converting a potentially harmful energy source into a beneficial surface treatment method
3Manufacturing precision
If chemical surface treatment with acid or solvent is used, then surface smoothing is achieved, but the process is complex requiring vacuum creation and removal of treatment agents
Solution Approach 1:
The patent replaces complex chemical surface treatment processes with a simpler physical thermal process using laser radiation. The laser directly heats and melts the plastic surface in air without requiring vacuum chambers or complex removal systems for treatment agents, significantly simplifying the overall process while achieving effective surface smoothing
Solution Approach 2:
The patent extracts and eliminates the need for complex vacuum systems and chemical removal infrastructure by using laser radiation that works effectively in atmospheric conditions. The process directly melts and smooths the surface without requiring the extraction or removal of treatment agents, thereby simplifying the equipment and process complexity
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
This method achieves a high-quality, homogeneous surface smoothing without changing the geometry of the molded part, effectively sealing pores and improving aesthetics and hygiene, while being safe for use in applications where skin contact is possible.
Implementation Method 1
igniting a combustible process gas introduced into the process chamber, wherein the surface of the molded part is at least partially dissolved by the ignited process gas
Implementation Method 2
the surface of the molded part is at least partially dissolved by the ignited process gas
Implementation Method 3
a heating step of heating the molded part to a predetermined temperature that is lower than the melting temperature of the plastic of the molded part
Data Source
AI summary
A method is provided for surface smoothing an additively manufactured shaped part consisting of plastic. The method has an explosion step with which the surface of the shaped part is smoothed in a process chamber by igniting a combustible process gas introduced into the process chamber, the surface of the shaped part being partly dissolved in at least some sections by the ignited process gas. Also provided is a device for surface smoothing additively manufactured shaped parts consisting of plastic.