一般傳統管材液壓成形時模具不動而只靠軸向進料推桿來推進管材。在成形過程中，若控制不良，會有挫曲或皺褶發生。另外，成形過程中管件與模具之間會有摩擦產生，使管件較難流動，造成膨脹區的厚度過薄而可能會破裂，厚度分布會不均勻。
因此提出之可移動式模具的觀念，可減少管材與模具之間的接觸摩擦力影響，使在成形過程中管件能夠均勻的流動，一旦有良好的流動性，甚至可提高擴管率的可能性，成形後厚度分布會因流動性良好，不會有變薄的現象。本論文使用可移動式模具設計之觀念，針對局部大鼓脹及全部大鼓脹之液壓成形提出一負載路徑進行液壓鼓脹之有限元素分析，進行厚度變化對有無可移動式模具影響之探討。經過模擬結果，可移動式模具及推桿之間的作動方式要進行兩次階段才能成功。
關鍵字：管材液壓成形、挫曲、皺摺、可移動式模具、摩擦力、負載路徑

When traditional hydroforming, die fixed and rely the axial feed punch press tube during the forming process, it is inevitable there will be buckling or wrinkling occurs. In addition, between the tube and the die of the forming process will be generated by the frictional force, so that the billet is difficult to flow, resulting in the thickness of the expansion zone is too thin and may fracture, the thickness distribution will be uneven.
Therefore, the concept of the movable die, it can reduce the influence of the frictional force contact between the tube and the die so that the billet during the forming process can be uniformly flow, once a good flowability can be improved even flaring the possibility of the rate of the thickness distribution after deformation due to the good flowability, and the not have thinned phenomenon. This thesis used the concept of movable die design for the local big bulging and all the big bulging hydroforming, and made a loading path for finite element analysis of hydraulic bulging thickness change with or without movable die effect discussed. After simulation results, the actuations of between movable die and punch have to do two phases that can success.
Keywords: tube hydroforming, bucking, wrinkling, movable die, frictional force,
loading path

第一章 緒論 ........................................................................................................ 1
1-1 前言 ............................................................................................................. 1
1-2 管材液壓成形製程之簡介及應用 .......................................................................4
1-3 文獻回顧 ...................................................................................................... 9
1-4 研究動機與目的 ........................................................................................... 10
1-5 論文架構 ..................................................................................................... 11
第二章 局部鼓脹成形之可移動式模具之設計 ......................................................... 12
2-1 前言 ............................................................................................................ 12
2-2 設計概念及原理 ............................................................................................ 13
2-3 有限元素模擬 ............................................................................................... 18
2-3-1 幾何模型建立 ............................................................................................ 18
2-3-2 軟鋼 JIS G3141 之塑流應力 ........................................................................ 21
2-3-3 模擬分析之假設 ..........................................................................................22
2-3-4 模擬結果 .................................................................................................. 22
第三章 全鼓脹成形之可移動式模具之設計 ............................................................ 34
3-1 前言 ........................................................................................................... 34
3-2 設計概念及原理 ........................................................................................... 34
3-3 有限元素模擬 .............................................................................................. 39
3-3-1 幾何模型建立 ........................................................................................... 39
3-3-2 模擬結果 .................................................................................................. 47
第四章 結論 ...................................................................................................... 57
參考文獻 .......................................................................................................... 58

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