Ultrasound-Assisted Spin Welding Processing Machine to Analyze and Discuss the Combined Processing of the Dissimilar Plastic Materials

• Main Authors: Chia- Han Chuang, 莊佳翰
• Other Authors: 許坤明
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/22e4uh

碩士 === 國立虎尾科技大學 === 創意工程與精密科技研究所 === 99 === This study used ultrasound-assisted spin welding processing machine to analyze and discuss the combined processing of the dissimilar plastic materials, in order to improve the tensile stress, surface quality, and processing efficiency by enhancing the insufficiency of the connectivity when heterogeneous materials are welded by the ultrasound. An integrated processing machine combining the ultrasonic welding and spin welding and equipped with the high-speed motor was used. Its main principle was to enable the conducting angle of the two work pieces in high-speed spinning to generate high temperature on the top through friction. When the thermoplastic materials reached the thermal deformation temperature, an adequate pressure was exerted on the other materials, so that the surfaces would be welded under the semi-molten state. Meanwhile, an ultrasonic oscillator was used for fierce oscillation, in combination with the amplified displacement effect of the sound wave welding head, the temperature of the contact friction face would rise, which would enhance the connectivity effect of the thermoplastic materials. The processing efficiency of the ultrasound-assisted spin welding of the dissimilar materials was from the design of the sound wave welding head, the quality of which would affect the processing effect. Therefore, this study used ANSYS finite element analysis software to analyze and design the step sound wave welding head, based on the data provided by the manufacturers. Theoretic welding head with the optimal dimension was designed and manufactured taking the step sound wave welding head provided by the manufacturers as the dimension basis. ANSYS was used for oscillation modal analysis, so as to obtain the natural frequency for further analysis and comparison. The frequency measuring instrument was used for the actual measuring of the theoretic welding head. The results showed that, for the sound wave welding head after using the ANSYS theory, the outcome of the actual modal measuring were similar to those obtained through the modal analysis by ANSYS. During welding head processing, the trial and error time for dimension modification could be saved greatly and the efficiency of the welding head could be promoted. The thermoplastic materials PVC and PP were used for processing test. The tensile strength of the test pieces after the experiment was obtained by the tension test. The optimal processing parameters and the contribution rates of the processing factors were determined by Taguchi method. The predicted value and the theoretical value were compared by confirmatory test, and the error rate was within 2%. The main factors to affect the welding results were the welding pressure and the hardening time of the ultrasound.