金屬線材多道次伸線過程中鑽石眼模之尺寸設計及磨耗分析

Design and Wear Analysis of Diamond Dies for Multi-Pass in the Wire Drawing Process

余尚翰(Shang-Han Yu)

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2007年)

摘要

目前的微細金屬線材，大都以伸線製程完成，伸線係指將金屬線材由粗變細的過程，一般業者使用連續式的抽線機械生產線材產品，且經過多道次眼模抽線製程，達成所需直徑之高品質線材。本文採用有限元素分析軟體DEFORM-2D，模擬微細金屬線材之伸線製程，且研究減少伸線道次以及伸線眼模的磨耗預測分析。研究發現減少道次改良後，能有效降低線材最大等效應變、最大等效應力值，結合延性破裂準則後探討伸線線材，發現延性破壞指數(Damage)會隨著摩擦係數、面積減縮率的增加而增加，並能預測發生延性破裂時機與方位，結合Archard磨耗模式應用於磨耗分析中，發現伸線眼模的最大磨耗量發生在減縮部靠近成形部處，並能預測各道次眼模磨耗量。

並列摘要

In this paper the designs of diamond dies for multi-pass metal alloy wire drawing processes is investigated. A finite element analysis of wire.The results indicate that the reduced drawing process improves the forming force, effective stress and strain. After combined the ductile fracture criteria, the value of ductile fracture on billet is growing with increased friction coefficients and reduction of area. Moreover, it can predict the timing and position when ductile fracture happen. Applied the Archard mode to the wear analysis, which can find the maximum wear quantity of drawing dies occurred at the position of reduction close to bearing, and can predict wear quantity of dies in every pass.

參考文獻

[33] 許源泉，鍛造製程分析講義，國立虎尾科技大學機械製造工程系，雲林，臺灣。

[3] C. C. Chen, S. I. Oh and S. Kobayashi, “Ductile Fracture in Axisymmetric Extrusion and Drawing. Part 1: Deformation Mechanics of Extrusion and Drawing”, Journal of Engineering for Industry, Vol. 101, pp.23-35, 1979.

[4] S. I. Oh, C. C. Chen and S. Kobayashi, “Ductile Fracture in Axisymmetric Extrusion and Drawing, Part 2: Workability in Extrusion and Drawing”, Trans. ASME, Journal of Engineering for Industry, Vol. 101, pp.36-41, 1979.

[5] M. S. Joun, S. M. Hwang, ”Optimal Process Design in Steady State Metal Forming by Finite Element Method. I. Theoretical Considerations”, Int. J. Mach. Tools Manuf., Vol. 33, pp. 51-61, 1993.

[6] M. S. Joun, S. M. Hwang, “Optimal Process Design in Steady State Metal Forming by Finite Element Method. II. Application to Extrusion Die Profile Design”, Int. J. Mach. Tools Manuf., Vol. 33, pp. 63-70, 1993.