具孔形非軸對稱鍛件之多道次閉模鍛造設計與分析

The Design and Analysis in Multi-stage Cold Closed-die Forging of Non-axisymmetric Hollow Parts

許光城 ； 黃英哲

《鍛造》 16卷4期 (2007/12) Pp. 38-44

https://doi.org/10.29791/Forging.200712.0006

摘要

一個具孔形非軸對稱件之塑性成形，須經過連續的多道次閉模鍛造而成，本文的鍛造製程分別是複合前向軸與反向孔擠伸（衝孔）、置入零件，以及反向擠鍛（閉孔）。三個道次中的衝孔與閉孔是屬於金屬成形的部分，因此作為模具設計與分析的重點。本文使用有限元素法(DEFORM 3D)模擬分析具孔形非軸對稱鍛件的成形與模具設計之最佳化，並針對塑性加工製程中常見的實際應用問題，如負荷大小、材料尺寸與位置、體積分配、溢料等現象加以分析研討，並針對缺陷來改善。在模擬塑性加工過程時，可以設定模具的作動條件，以了解是否會發生溢料、折料。胚料的流向以及充模的情形。更可利用模具應力分析來模擬設計的模具是否會有應力集中問題，增長模具使用壽命；經由前述研究將可以降低試模的成本與開發時間，並提昇產品品質。

關鍵字

具孔形非軸對稱鍛件 ； 閉模鍛造 ； 有限元素分析 ； 塑性加工

並列摘要

A non-axisymmetric hollow part is often manufactured by multi-stage forging process, such as backward cup extrusion and forward extrude-forging, In this paper, a finite-element analysis tool, DEFORM-3D, was used to simulate these forging processes to obtain the optimization of die design. Several practical considerations or problems, such as forging load, billet size and position, volume allocation, flash, and forging defect were solved and discussed. During forging simulation, the condition of die motion can be pre-set in order to find out the problems of flash, folding and die-filling. The die stress analysis was also conducted to realize the stress concentration of forging die so as to increase die life.

並列關鍵字

non-axisymmetric hollow part ； closed-die forging ； finite-element analysis ； plasticity working