Effect Study and Better Combination of Process Parameters for Tube Forming by a New Processing Technique of Bending and Hydroforming

新的彎曲及液壓管件成形製程技術較佳製程參數組合及影響效應之研究

林盛勇(Shen-Yung Lin) ； 施志承(Jhih-Cheng Shih)

《中國機械工程學刊》 41卷6期 (2020/12) Pp. 745-753

摘要

This work presents a new forming processing technique for tubular forming which the bending and hydroforming bulging are completed subsequently by a die set. The FEM is applied to simulate the entire forming processes for producing a bending and bulging tube. The effects of such process parameters as bending angle, bending radius, bending velocity, punch velocity and internal pressure on distributions of wall thickness, effective stress, effective strain and formability of the tube are investigated. Furthermore, the orthogonal array and factor response in the Taguchi method are applied together to determine the optimal process conditions. Because possible forming defects are not considered as a constraint when determining the optimal process conditions, analysis of variance for factor contribution is applied to adjust the obtained optimal process conditions. A better process condition is thus ascertained such that the finished tube is free of forming defects and has a thicker tube wall thickness.

關鍵字

subsequent technique ； bending ； hydroforming bulging ； Taguchi method

並列摘要

本文提出一新的管件成形製程技術，藉由一組模具依序完成彎曲與液壓成形鼓脹。使用有限元素法模擬整個管件彎曲與鼓脹成形製程。研究製程參數，例如彎曲角、彎曲半徑、彎曲速度、冲頭速度及內壓力，對於壁厚分布、有效應力、有效應變、及管件成形性的影響效應。再者，結合田口法的直交表及因子反應表加以應用，以求取最佳的製程條件。因最佳製程條件求取過程中可能的成形缺陷沒有被考慮為拘束條件，故使用因子貢獻率的變異數分析來調整所求得最佳的製程條件。最後，一較佳製程條件被確立，使得完成的管件沒有成形缺陷，且具有較厚的管壁厚度。