Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2274
標題: 連接儲氣筒與氣壓模墊間的接管設計對板件沖壓影響之研究
Effect of the pipe connecting tank to an air cushion on sheet metal stamping
作者: 謝宗倫
Hsieh, Chung-Lung
關鍵字: air cushion;氣壓模墊;blank holder force;sheet metal stamping;壓板力;沖壓成形
出版社: 機械工程學系所
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摘要: 
壓板力的提供乃影響板件成形結果的重要因素,適當的壓板力提供可使板件的成形更趨完美。以氣壓模墊提供成形所需壓板力時,常因機台空間限制,無法獲得較為適當之壓板力。若於汽缸外另以接管連接儲氣筒,解決空間不足的問題,此時汽缸的壓力變化即異於單一缸體時,如此即可能會對成形結果產生影響。故本研究藉由力學模型的建立,探討於不同的沖壓行程及速度,以不同尺寸的接管連接汽缸與儲氣筒,於沖壓過程汽缸壓力的變化。並以計算流體力學之模擬軟體FLUENT進行模擬分析,比較驗證力學模型之可行性。最後利用成形模擬軟體 DYNAFORM ,進行板件成形模擬分析,將力學模型求得各種情況的汽缸壓力曲線,分別作為成形模擬時壓板力的提供,探討其對板件成形的影響。結果證實沖壓條件與接管尺寸確實會影響沖壓過程汽缸的壓力變化,進而影響沖壓過程壓板力的提供,而對成形的結果造成影響。當汽缸的壓力於沖壓過程中,增大的幅度超出汽缸初始壓力的16.67% 時,即會使成形板件有較嚴重的薄化現象甚至破裂。藉此結果反推於各種沖壓條件情況下,合適之氣壓模墊規格與接管尺寸,作為氣壓模墊設計及選擇的參考。

One of the most important factors by stamping a sheet metal is the blank holder force which can offer appropriate clamping forces letting the sheet metal flow or blocking it to flow and therefore a perfect part can be achieved. However when an air cushion is used to build up the blank holder force, the blank holder force might not be appropriate for the forming part due to the limited space underneath the press where the cushion is installed. If a tank out of the press is attached to the cushion, the situation might be improved though, the pipe connecting the tank and the cushion still might affect the blank holder force. Hence a model was generated in this study to describe the pressure drop between two ends of the connecting pipe. The pressure in the air cushion and in the tank at any time during the press operation can therefore be determined. An investigation of the size of the connecting pipe, the press stroke, and the stroke per minute on the pressure in the cushion was performed in this study for forming with a mechanical crank press. To check the feasibility of the model created by this study, a FDM simulation was accomplished with the commercial computational fluid dynamic software FLUENT. Furthermore, an investigation of the blank holder forces above calculated in this study on forming a sheet metal part was carried out with the commercial sheet metal stamping software DYNAFORM. The results show that the model created by this study is suitable to determine the appropriate pipe size for the forming application and the pipe size as well as the application setups should follow the design guideline so that the pressure in the cushion at the bottom dead center does not exceed above 16.67%.
URI: http://hdl.handle.net/11455/2274
其他識別: U0005-1808200912115900
Appears in Collections:機械工程學系所

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