Development of a novel hybrid molding process to manufacture high-performance composite parts

• Main Authors: WEI-SHENG LI, 李偉聖
• Other Authors: CHIH-YUAN CHANG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/49sau8

碩士 === 國立高雄科技大學 === 模具工程系 === 107 === In recent years, the global plastics industry has ignited a lightweight cyclone. Therefore, the application of fiber-reinforced plastic composite materials with light weight, high strength and high rigidity has been gradually popularized and valued. At present, various types of plastic composite products are produced. Two of the most popular processes for manufacturing plastic composite products are injection molding and thermoforming. However, the addition of long fiber reinforcing material in the injection machine is often caused by the rotation and twisting of the screw. The fiber length is shortened, resulting in a fiber reinforcement effect that is less than expected. Therefore, most of the plastic composite parts with continuous long fibers are produced by thermoforming. The process and mold design of this method are relatively simple, and the structure of long fibers is not arbitrarily cut, but it is not suitable for shape complex and sophisticated products. In the light of this, this research proposes a hybrid molding technology of thermoforming and injection molding, and hopes to successfully produce high-performance composite parts with both long and short fiber structures through proper mold design and process integration. In this study, the standard tensile test, impact test, three-point bending test are used for determining the mechanical properties of the composite parts. An experimental study, based on the Taguchi orthogonal array design, was conducted to characterize the effect of different processing parameters on the hybrid molding of composite parts, so that steps can be taken to optimize the molding process.