本研究為結合化學熱浸式處理與不同攪拌方式對高速積層製造之多噴嘴燒熔技術進行後處理製程之研究，以PA12粉末材料列印後處理試片，探討在經過磁石攪拌處理與超音波震盪處理後其機械性質與表面粗糙度之變化，以及經處理前、後試片對於色彩附著度的比較。
本研究方法是先利用漢森溶解度參數尋找與PA12溶解度相符之化學溶劑二甲基乙醯胺(Dimethylacetamide, DMAC)，進行分析以確定此溶劑與PA12列印件之起始反應溫度，並以此溫度作為區間進行化學熱浸式處理溫度與時間參數之研究，以化學溶劑中之強氫鍵與列印件表面反應形成液態溶劑薄膜，使其達到表面平滑並改善表面粗糙度之效果，並探討其機械性質之變化；再對PA12列印件在磁石攪拌與超音波震盪兩種不同攪拌方式下進行化學熱浸式處理，以探討試片表面處理均勻度與形貌尺寸變化的穩定性；接著將未處理和經化學熱浸式處理之PA12試片進行浸染法與噴漆法染色，並使用百格試驗比較兩種上色方法對於有無化學熱浸式處理之試片的色彩附著度。
研究結果發現PA12列印件經過化學熱浸式處理後成功改善其表面粗糙度與拉伸應變，可證實化學熱浸式處理對表面粗糙度與機械性質都能獲得相當的改善，並且藉由此有效處理溫度與時間進行磁石攪拌與超音波震盪化學熱浸式處理；在不同攪拌方式處理之結果中，超音波震盪處理表面粗糙度最多能降低至0.54µm改善96.0%，有效平滑PA12列印件表面，並且能成功地控制不穩定的尺寸變化；在處理前、後試片色彩附著度之結果中，浸染法對於化學熱浸式處理之PA12試片能成功上色，並且能保留經處理後改善的表面粗糙度值。綜合以上結果可以證明本研究所開發之後處理製程結合超音波震盪能有效改善化學蒸氣處理所面臨的腔體對流不足、變形劇烈和處理時間較長的問題，同時也能達到市場對於色彩美觀的需求度，可望在未來開發此後處理製程之商用設備，以提高PA12列印件後處理之品質與效率。

This research is a post-treatment process of the multi-jet fusion technology for high-speed additive manufacturing by combining chemical hot-dipping treatment and different stirring methods. The material of the post-treatment samples are printed with PA12 powder, and the changes of mechanical properties and surface roughness after magnet stirring treatment and ultrasonic vibration treatment, and the comparison of color adhesion of samples before and after treatment were discussed.
This research method is to first use the Hansen solubility parameter to find the chemical solvent DMAC that is consistent with the solubility of PA12. And analyze to determine the initial reaction temperature of the solvent and PA12 prints, and this temperature was used as an interval to research the temperature and time parameters of chemical hot-dipping treatment. Use the strong hydrogen bond in chemical solvent to react with the surface of the printed part to form a liquid solvent film to improve the surface roughness, and to explore the change of its mechanical properties. Then, the PA12 prints were subjected to chemical hot-dipped treatment under two different stirring methods: magnet stirring and ultrasonic vibration. And discussing the stability of the surface treatment uniformity and the dimensional change of the samples. Then, the untreated and chemically hot-dipping treated PA12 samples were colored by dip dyeing and spray painting. And use the cross-cut tape test to compare the color adhesion of the two coloring methods to the samples with or without chemical hot-dipping treatment.
The results of the research found that the surface roughness and tensile strain of PA12 printed parts were successfully improved by chemical hot-dipping treatment. It can be proved that the chemical hot-dipping treatment can achieve considerable improvement in the surface roughness and mechanical properties, and the effective temperature and time is used for magnetic stirring and ultrasonic vibration treatment; In the results of different stirring methods, the surface roughness of ultrasonic vibration treatment can be reduced to 0.54µm at most and improved by 96.0%, effectively smoothing the surface of the printed part, and can successfully control unstable dimensional changes; In the results of color adhesion of samples before and after treatment, the dip dyeing method can successfully color the PA12 samples treated by chemical hot dipping treatment, and can retain the improved surface roughness value after treatment. Based on the above results, it can be proved that the post-treatment process developed by this research combined with ultrasonic vibration can effectively improve the problems faced by PA12 printed parts, at the same time, it can also meet the market demand for beautiful colors. It is expected that commercial equipment for the chemical hot dipping treatment will be developed in the future to improve the quality and efficiency of the post-treatment of PA12 prints.

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