A study on the optimum parameters selection in the precision casting of hip and knee implant by using Taguchi method

• Main Authors: Sheng-Chih Hu, 胡勝智
• Other Authors: Wu-Yao Chiou
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/eh62zf

碩士 === 國立高雄應用科技大學 === 模具系碩士在職專班 === 103 === Distal femoral is the key components in total knee prostheses and hip bipolar is the key components in total hip replacement. The purpose of this study is to improve the shrinkage cavities ( shrinkage and microporosity ) volume of distal femoral and hip bipolar in the process of precision casting. The casting gating and riser design in distal femoral are defined by two kinds of runner system (rectangular and square) and in hip bipolar is just defined by one kind of runner system (rectangular). This study simulates the distal femoral and hip bipolar by Finite Difference Method. Then, using four factors ( casting temperature, pouring time, shell thickness and shell temperature ) to optimize the shrinkage volume of femoral and bipolar by Taguchi method and to discuss the differences between the simulation and experience results. Based on the results of simulation, it is shown that the shrinkage of the casting could be reduced by increasing the shell temperature and the shell thickness. The shrinkage occurred rate were reduced from 30% to 98% depend on the different shape of casting that compare with the original parameters. Also, after twice Taguchi method can found the optimum parameters for reduce the shrinkage and microporosity much more. The accuracy of simulation was validated by the experiment. The results also show that the experiments agree with the simulation.