Co-Extruding Composites of cBN-Tic and WC-Co Optimized by Taguchi Methods

• Main Authors: Huei-Han Shiu, 許輝瀚
• Other Authors: Shi-Yung Chiou
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/07868317753701641997

碩士 === 國立高雄應用科技大學 === 模具工程系 === 100 === This research is to co-extruding the composite tube with tough outer layer of WC-Co powder and hard inner layer of cBN-TiC powder based on Taguchi experimental method. The process parameters such as extrusion ratio, half -die angle, extrusion speed and concentration of glyeerin and ethanol are controlled to obtain the maximum hardness and minimum porosity. The orthogonal array of L9 is designed to obtain the optimal parameters by S/N evaluation, analysis of variance (ANOVA) and contribution factor. The results show the optimal parameters A1B3C2D2 (extrusion ratio of 2.3:1, half-die angle of 30°, extrusion speed of 2mm/min and 5% glyeerin with 9% ethanol) for inner layers of cBN-TiC and A1B3C2D2 (extrusion ratio of 4:1, half-die angle of 30°, extrusion speed of 2mm/min and 6% glyeerin with 10% ethanol) for outer layer of WC-Co . The hardness for WC-Co and cBN-TiC is 1849Hv and 3825Hv, respectively while porosity for WC-Co and cBN-TiC in nearly the same with 10.4%. The difference between S/N from the verified experiment and the predicted data in very small to show the valid experimental model.