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研究生:黃國鈞
研究生(外文):Guo-Jun Huang
論文名稱:棒材旋鍛成形之有限元素分析
論文名稱(外文):FE Analysis of Rotary Swaging of Rods
指導教授:林恆勝林恆勝引用關係
指導教授(外文):Heng-Sheng Lin
學位類別:碩士
校院名稱:國立虎尾科技大學
系所名稱:創意工程與精密科技研究所
學門:藝術學門
學類:視覺藝術學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:67
中文關鍵詞:旋鍛金屬成形有限元素法
外文關鍵詞:rotary swagingmetal formingfinite element method
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  • 被引用被引用:3
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棒材在旋鍛縮徑成形時,旋鍛模塊受到主軸旋轉帶動而對工件造成切方向作用力,進而形成螺旋流線之成形缺陷,本研究藉由DEFORM 3D有限元素軟體來模擬棒材旋鍛成形,探討面積縮減率、旋鍛模傾角、摩擦因子與胚料直徑等參數,對於棒材在旋鍛過程中所形成螺旋流線、等效應變分佈與多餘變形因子之影響。
研究後有以下結論: 棒材旋鍛成形後呈現螺旋流線之成形缺陷,增加面積縮率、減少傾角與增加摩擦因子,都會造成旋鍛模的切向作用力加大,因此工件的扭轉角度也愈大,其中尤其以面積縮率的影響最明顯。在相同成形條件下工件外徑為0.1與1 mm的扭轉角相當接近,而在外徑10 mm的扭轉角則明顯較低,顯示棒徑愈小,表面力作用的效應則更明顯,旋鍛後愈容易造成工件表面等效應變的增加,此效應類似以較大摩擦因子的條件進行旋鍛,間接驗證微旋鍛情形下,表面作用力會較顯著。
藉由多餘變形因子來定量分析圓棒旋鍛之變形不均程度,結果顯示面積縮率較小、眼模半角較大、摩擦因子較大與外徑較小時,變形不均程度較大。較奇特的現象是在面積縮率較小的旋鍛條件下,模具對工件的作用較不易達到軸心部,再加上旋鍛是以漸增方式成形,因此在工件軸心之等效應變會略小於均勻變形之應變值,但是在表面之應變值仍高,因此多餘變形因子仍較高,因此旋鍛製程的最終變形不均程度仍高。
In sinking rods with rotary swaging, spiral defect would occur because the workpiece is subjected to tangential force caused by the swaging dies driven by spindle motor. This work investigates the effect with the aid of FEM software DEFORM 3D. The influence of reduction of area, die inclination angle, friction factor, and workpiece diameter on the formation of spiral defect, distribution of effective strain, and redundant deformation factor was analyzed.
The results showed that spiral became significant with increasing reduction, decreasing die angle or increasing friction factor. The effect of reduction of area was most influential. Under the same forming conditions, the twist of diameters 0.1 and 1 mm were similar, while that of diameter of 10 mm was smaller. This indicated the effect of surface force became more influential and caused the increase in effective strain near workpiece’s surface with small sized workpiece. The effect was also similar to rotary swaging with high friction. Therefore a deduction could be made that surface force became influential in micro rotary swaging.
Redundant deformation factor was used to evaluate the level of deformation inhomogeneity. The results showed that inhomogenity increased with decreasing reduction, increasing die angle and friction factor, and decreasing workpiece diameter. A peculiar phenomenon would occur in rotary swaging with smaller reduction. The effective strain was smaller than the homogeneous strain at workpiece center, while greater than that of drawn rod on the surface. This was due to the swaging die only acted on the surface and less effectively at center, under the increment forming operation. The resultant redundant deformation factor was still greater with rotary swaging because surface strain was still higher than that of drawn rod.
中文摘要..................................................i
英文摘要.................................................ii
誌謝.......................................................iv
目錄.......................................................v
表目錄....................................................vii
圖目錄....................................................viii
第一章 緒論.............................................1
1.1前言...................................................1
1.2研究目的.............................................3
1.3文獻回顧.............................................6
1.4論文總覽.............................................11
第二章 理論基礎.......................................13
2.1金屬成形分析理論介紹..........................13
2.2旋鍛成形基本理論................................16
2.3旋鍛模設計簡述...................................18
第三章 研究方法.......................................23
3.1 Deforom軟體之簡介.............................23
3.2 模型建立與參數設定............................24
3.3模擬策略與技巧...................................27
3.3.1模具與胚料的動作設定.......................27
3.3.2胚料鍛流線設定與量測方法.................30
第四章 圓棒旋鍛模擬結果與討論.................33
4.1 材料流動分析......................................34
4.2 扭轉角分析.........................................35
4.2.1 面縮率對扭轉角的影響......................35
4.2.2 旋鍛模傾角對扭轉角的影響................38
4.2.3 摩擦因子對扭轉角的影響...................40
4.2.4 外徑對扭轉角的影響..........................42
4.3 等效應變分析.......................................44
4.3.1 面積縮率對等效應變的影響.................47
4.3.2 旋鍛模傾角對等效應變的影響..............49
4.3.3 摩擦因子對扭等效應變的影響..............51
4.3.4 外徑對等效應變的影響........................53
4.4 多餘變形因子分析.................................55
4.4.1 面積縮率對多餘變形因子的影響...........55
4.4.2 旋鍛模傾角對多餘變形因子的影響........57
4.4.3 摩擦因子對多餘變形因子的影響...........59
4.4.4 外徑對多餘變形因子的影響..................61
第五章 結論與建議......................................62
5.1 結論.....................................................62
5.2 建議.....................................................63
參考文獻....................................................64
參考文獻
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