輕量化節能聚乳酸元件耐磨性研究：Part 2－元件表面紋路呈垂直或平行摩擦之摩擦性能的探討

隨著3D列印技術的發展，3D列印PLA材料常用以開發設備元件與組件的原型，例如齒輪、蝸桿與蝸輪，或是皮帶輪與皮帶等，這些原件常承受著高負荷與高速的使用條件。為了減少元件不恰當使用所造成的損傷及浪費，以及評提升元件的耐磨性以提升使用壽命，本研究以往復摩擦實驗進一步探討元件表面紋路呈垂直或呈平行摩擦之條件，在摩擦過程三個階段的磨耗性質。輕負荷條件下，上下試片紋路呈平行摩擦會比紋路呈垂直下表現出更好的耐磨性。在更高負載下，當表面紋理垂直時，耐磨性會顯著增加。在高溫條件下，紋路呈平行摩擦時耐磨性較低。當表面紋理垂直時，摩擦介面在高溫下仍具有較大的摩擦力，可為滑動摩擦生熱提供更多的能量，因此表面紋路呈平行有最高的溫度。由於摩擦界面發生嚴重磨損和材料的轉移，摩擦係數逐漸增加，隨著溫度繼續升高到接近PLA的軟化溫度時，上試片軟化區更容易發生黏滯摩擦，因此摩擦係數變小。由上面的結果可導入3D列印PLA元件的使用條件，讓這些輕量化元件在壽命提升上更有未來導入量產使用的競爭力。

關鍵字

PLA元件；表面紋路；摩擦係數；磨耗

並列摘要

With the development of 3D printing technology, 3D printing PLA materials are often used to develop prototypes of equipment elements and components, such as gears, worms, worm wheels, pulleys, belts, etc. These originals are often subjected to high load and high-speed conditions. To reduce the damage and waste caused by improper use of components, and to improve the wear resistance of components to increase their service life, this study further explored the condition of vertical or parallel friction on the surface of components by using reciprocating friction experiments. During the friction process, three wear properties of each stage. Under light load conditions, the parallel friction of the upper and lower test pieces will show better wear resistance than that of the vertical lines. At higher loads, the wear resistance increases significantly when the surface texture is vertical. Under high-temperature conditions, the wear resistance is lower when the lines are parallel to the friction. When the surface texture is vertical, the friction interface still has greater friction at high temperatures, which can provide more energy for sliding friction to generate heat, so the surface texture is parallel and has the highest temperature. Due to severe wear and material transfer at the friction interface, the friction coefficient gradually increases. As the temperature continues to rise to close to the softening temperature of PLA, viscous friction is more likely to occur in the softening zone of the upper test piece, so the friction coefficient becomes smaller. The above results can be used to guide the use conditions of 3D printed PLA elements, making these lightweight components more competitive for mass production in the future in terms of life expectancy.

並列關鍵字

PLA element ； Surface texture ； Friction coefficient ； Wear

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