Optimal tool design of the tunnel-type punching machine with multiple quality characteristics

• Main Authors: Chu-Yih Hun, 洪崇益
• Other Authors: Jin-Yih Kao
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/37465392102295806543

碩士 === 龍華科技大學 === 工程技術研究所 === 98 === Sheet metals of the galvanized steel or the cold-rolled steel are the materials that usually used to manufacture the components of ball bearing slides. The sheet metal need to form the designed cross-section by using the successive rolling process first, then the semi-finished part is cut into the desired length on the tunnel-type punching machine. Since the workpiece is not a plate, geometries of the cutting tool varying with the non-linear cross-section is necessary to obtain the expected cutting performance. In this paper, ,optimal tool design in cutting the components of ball bearing slides with considering the multiple performance characteristics by using the Taguchi method and grey relational analysis is reported. Three performance characteristics are chosen to evaluate the cutting effects while eight parameters of tool geometry are selected as the controlled factors. Experiments based on the appropriate orthogonal array are conducted first. The normalized experimental results of the performance characteristics are then introduced to calculate the coefficient and grades according to the grey relational analysis. The optimized process parameters that simultaneously lead to better results are then verified through confirmation experiment. The outcome from Taguchi method indicate the radius of the cutting edge is the most significant geometric parameter to the tool life and the burr of cut edge, and that to the width deviation on both sides of the workpiece is tangent angle. From the grey relational analysis showing, optimal process parameters obtain the improvement of 18% on tool life, of 18% on burr of cut edge and of 133% on the width deviation on both sides of the workpiece, respectively.