臺灣博碩士論文加值系統

本研究分別針對2D及3D逆向擠製成形進行有限元素模擬，使用商用有限元素軟體2D/3D Deform模擬逆向擠製成形之塑性變形行為與特性，並與Superform商用有限元素軟體進行模擬比較。在常溫下模擬且忽略成形之熱傳導現象，並假設工件與模具及衝頭之界面摩擦為定剪摩擦及庫倫摩擦，模擬逆向擠製成形後之工件幾何外形、等效應力、等效應變、速度場、壓力分佈及擠製負荷等。再者，使用田口法進行2D及3D逆向擠製成形最佳化設計，以田口法L9(34)直交表進行實驗規劃，包含有4種不同之實驗參數，模具圓弧半徑、衝頭鼻面角度、衝頭咬合長度及摩擦因子比(或摩擦係數比)等控制因子，加以探討逆向擠製成形特性之影響，求得工件幾何外形與擠製負荷之最佳化實驗參數。再者，在定剪摩擦下考慮衝頭旋轉之擠製成形模擬分析，並比較衝頭無旋轉之2D及3D擠製成形以瞭解其差異性。為了驗證3D旋轉逆向擠製成形分析模式，與Kim期刊論文實驗結果[41]相互比較，可驗證模式之適用性。

The study aims at 2D and 3D backward extrusion forming to carry out the finite element simulation, the plastic behavior and properties in backward extrusion forming can be simulated by the commercial Deform 2D/3D FEM software. And simulation based on Superform FEM software is used to compare with Deform. Neglect the heat-transfer phenomenon to simulate the backward extrusion forming at the room temperature, and the interface frictions between work-piece and die as well as punch are assumed as constant shear friction and coulomb friction to simulate the geometrical shape of work-piece, the effectibe stress, the effectibe strain, the velocity field, the pressure distribution and the Extrusion Force and so on. Moreover using Taguchi method to perform 2D/3D backward extrusion forming, and the experimental plan of L9(34) orthogonal table is conducted by way of four experimental parameters such as the fillet of die, the punch nose face angle, the punch seizing length, and the frictional factor ratio(or frictional coefficient ratio) to investigate the characteristics influence of backward extrusion forming. The optimal experimental parameters to affecting the geometrical shape of work-piece and Extrusion Force can be obtained. Futhermore, simulation on backward extrusion forming considering punch rotation under constant shear friction is analyzed, and comparing to 2D and 3D backward extrusion forming without rotation to realize the difference. With a view to verifying the 3D rotating backward extrusion, the experimental results of Kim’s journal paper [41] have been comparad to verify the acceptance of the model.

摘要
Abstract
誌謝
目錄
圖目錄
表目錄
符號說明
第一章 緒論
1.1 前言
1.2 塑性加工分析方法
1.3 研究動機與目的
1.4 文獻回顧
1.5 論文架構

第二章 定剪摩擦下2D逆向擠製成形最佳化分析
2.1 前言
2.2 定剪摩擦下Deform 2D逆向擠製成形最佳化分析
2.3定剪摩擦下Superform 2D逆向擠製成形最佳化分析

第三章 庫倫摩擦下2D逆向擠製成形最佳化分析
3.1 庫倫摩擦下Deform 2D逆向擠製成形最佳化分析
3.2 庫倫摩擦下Superform 2D逆向擠製成形最佳化分析

第四章 3D旋轉逆向擠製成形最佳化分析
4.1 前言
4.2 Deform 3D無旋轉逆向擠製成形最佳化分析
4.3 Deform 3D有旋轉成形最佳化分析

第五章 結論與建議
5.1 結論
5.2 建議

參考文獻
作者簡歷

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