金屬微細線材伸線之多道次製程分析

The Multi-Pass Design in the Wire Drawing Process

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。研究發現減少道次改良後，能有效降低線材應力與應變值，以及每一道次的抽線負荷起伏降低，且最後一道次的抽線負荷明顯較小，可減少最後一道次眼模的磨耗，使得線材最終尺寸較為精準。因此藉由有限元素法分析伸線製程，可在每一道次面積縮減時，材料抽拉負荷能達到平衡且都能低於一安全值為目標，而減少製程之道次，如此可減少成本。

In this paper the designs of diamond dies for multi-pass metal alloy wire drawing processes is investigated. A finite element analysis of wire drawing is used to predict the stress distributions and the forming force. The multi-pass analysis is aimed to achieve a satisfactory balance of the drawing stress on the material maintaining in the meantime the drawing stress at each pass below a safety value. Both the traditional drawing process and the reduced drawing process are simulated. The results indicate that the reduced drawing process improves the forming force, effective stress and strain. The cost of forming is also greatly reduced.