摘要(英) |
In accordance with the strength of the product, in the present a lot of plastic materials are applied for the features of light weight, anti-corrosion, non-rust and low cost instead of using metal materials. Among plenty of plastic processing, the injection molding has great result in forming the complicated shapes with high speed and easy control of dimensional accuracy. The processing has advantages in production, however, the limits of mold design, product style, machine adjustment and processing conditions always lead to product external and internal defects. As a result, the product design is aimed to avoid the to decrease the effect on the appearance and the strength of products.
This study used polycarbonate (PC) and added carbon fiber as experimental materials to investigate the effect of injection molding parameters on the tensile strength of weld line through Taguchi experimental methods and response surface methodology. Seven control factors, namely, melt temperature, mold temperature, injection speed, injection pressure, holding speed, and holding pressure, were combined with PC only, PC with 5% added carbon fiber, and PC with 10% added carbon fiber, to derive a total of 27 injection molding parameter combinations for experimental analysis. Accordingly, a tensile strength prediction equation composed of molding parameters was established, and the parameter combination that yields the optimal tensile strength was obtained through optimization. The relationship between molding parameters and tensile strength was thus discerned. It is expected that the experimental results of this research can provide some references for the improvement of processing quality in related fields.
|
參考文獻 |
[1] E.M. Hagerman, “Weld-Line Fracture in Molded Parts”, Plastics Eng. Vol29, pp77-79, (Oct. 1973).
[2] S. G. Kim and N. P. Suh, “Performance Prediction of Weld Line Structure in Amorphous Polymers”, Polym. Eng. And Sci, Vol. 26, No. 17, Sept. pp.1200-1206, (1986).
[3] 黃富勇,“塑膠射出成型之材料參數對縫合線強度的最佳化設計”, 國立成功大學,碩士論文,1996。
[4] 曾宇譚,“射出成型之製程參數對不同材質縫合線強度的影響”, 國立成功大學,碩士論文,1996。
[5] 楊清智,“薄殼射出成型件縫合線之探討”,中原大學,碩士論文,民國88年。
[6] L. Cosmar, “Molding Engineer Resins into Thin Wall Applications: Issues and Answers”, SPE Tech, pp.446-449, (1997).
[7] J. Bozzelli, “Pressure Loss in Thin Wall Moldings”, SPE Tech., pp. 173-175, (1997).
[8] Tantakom, “Processing Strategies for Thin Wall Injection Molding”, SPE Tech, pp.367-371, (1998).
[9] P. Oehle, “Estimation of Machine Requirements and Process Optimization of Thin Wall Injection Molding”, SPE Tech, pp.571-576, (1997).
[10] M.C. Huang, C.C. Tai, “The effective factors in the warpage problem of an injection-molded part with thin shell feature”, Journal of Materials Processing Technology pp.110-119(2001).
[11] C.S. Chena, et al “Investigation on the weld line strength of thin-wall injection molded ABS parts”, International Communications in Heat and Mass Transfer, Vol 34, pp.448-455 (2007).
[12] S. Patcharaphun and P. Jariyatammanukul, “The Effect of Thickness on the Weld-Line Strength of Injection-Molded Thermoplastic Composites”, Polymer-Plastics Technology and Engineering, Vol.41, pp.1305-1309, (2010).
[13] 胡雲宏,射出成形寶典: 現場實務運用工具書,財團法人塑膠工業技術發展中心,2007。
[14] 劉正英、楊鳴波,工程塑膠改善技術,化學工業出版社,2007。
[15] 蘇朝墩,”品質工程”,中華民國品質學會,2003年10月。
[16] 橫山僎子,”品質設計的實驗計畫法”,中國生產力中心,1999年6月。
[17] Tao C. Chang and Ernest Faison, III,” Optimization of Weld Line Quality in Injection Molding Using an Experimental Design Approach” Journal of injection molding Technology, Vol.3, No.2, pp.61-66, (1999).
[18] https://blog.xuite.net/dnalvqrq/wretch/101221110
[19] Xiaofei Yan, Shengbin Cao,” Structure and interfacial shear strength of polypropylene-glass fiber/carbon fiber hybrid composites fabricated by direct fiber feeding injection molding” Composite Structures Vol 185, pp.362-372(2018).
[20] Yuyang Song, et al “CAE method for compression molding of carbon fiber-reinforced thermoplastic composite using bulk materials” Composites Part A Vol 114, pp.388-397 (2018).
|