應用可移動式模具於管材大鼓脹液壓成形之研究

Study of Large-expansion-ratio Tube Hydroforming with Movable Dies

黃永茂(Yeong-Maw Hwang) ； 謝昕諺(Shin-Yan Hsieh) ； 郭乃榮(Nai-Rong Guo)

《鍛造》 25卷3期 (2016/10) Pp. 23-29

摘要

為了應付日新月異的製造需求，提出應用可移動式模具於大鼓脹液壓成形技術，讓液壓成形技術可以製造更多元的產品。本研究成品為具有軸偏心、大鼓脹與塑性變形區空間大等特徵，透過可移動式模具的應用，可以讓成品成形後有更均一的厚度。本研究使用Dynaform與LS-DYNA對各項參數進行有限元素分析，包括次推桿衝程、主推桿衝程、移動模具外型與內壓力路徑的影響性。實驗部分，設計對應機構，參與控制系統開發，並製作複合式液壓桿機台進行實驗，成品實驗計畫使用低碳鋼與不銹鋼鋼管進行實驗。

並列摘要

The technique of large expansion-ratio Tube Hydroforming with Movable Dies is designed for the demand. The product has features of large expansion ratio and different central axis. Tube hydroforming with movable dies is proposed to enhance the capacity of tube hydroforming technology. With movable die design, product with more uniform thickness can be obtained, and the forming pressure becomes lower than that needed in tube hydroforming without movable dies. Finite element code LS-DYNA and DYNAFORM is used to analyze the plastic flow pattern of the tube. The loading paths of internal pressure, axial punches and movable dies for obtaining a sound product are determined by an adaptive simulation algorithm and the basic geometric analysis. The Compound Hydraulic Cylinders is designed for the experiment to verify our simulation. The low-carbon steel and stainless steel tubes are planned to be applied in the experiment.