- 學位論文
射出成型參數與纖維含量對製品真圓度影響之研究
Study of the Influence of Injection Molding Parameters and Fiber Contents on the Product Roundness Accuracy
摘要
中文摘要 塑膠射出產品具有比重輕、精密度高且生產速度快等優點廣泛受到消費電子產品的重用，然而塑膠產品容易因為在射出成型過程的體積收縮不均，導致塑件翹曲或脫模變形，若是圓形類產品將造成真圓度不佳。 本研究針對圓型塑膠產品在成型條件的變更，包含模溫、熔膠溫度、射出速度的變化來找出最佳條件，並使用PC原料與含10%纖維及30%纖維三種不同含纖量做比對，得知纖維含量對真圓度的影響，並經由CAE軟體分析和實驗量測結果相互印證顯示，PC原料的真圓度值均優異於含纖的材質，且含纖維越多之塑料其流動平衡越低，纖維本身的收縮小，所以添加纖維可抑制收縮，分子或纖維配向在平行和垂直流動方向的差異與成品內部溫度的變化是造成真圓度變化收縮不均的因素，成型條件上使用高模溫對於真圓度會有較優異的效益。
並列摘要
Abstract Plastic injection products with light weight, high precision and productivity have been widely utilized on consumer electronics. However, the uneven volume shrinkage during the process of injection will cause the product curved or deformed after demolding. It will also result in poor roundness of round products. To find the best approach, the study focus on the round plastic products with different molding conditions, including mold temperature, melting temperature and injection speed. Comparing PC material in 0% fiber, 10% fibers and 30% fibers by CAE software and physical experiment will know the effect of fiber content in terms of the roundness. It came to a conclusion that the roundness of products in PC material without fibers is better than those with fibers. Moreover, those which contain more fibers got lower flow balance. Due to small shrinkage rate of the fiber, adding fibers can restrain shrinkage rate of the product. The reason of uneven shrinkage and variation of roundness came from the fiber orientation in the direction parallel or perpendicular to the flow, as well as the temperature difference inside the product. Rising temperature in molding condition can improve roundness.