發(fā)布時間：2018-07-16 07:45

【摘要】：以某車型后背門內(nèi)板為研究對象,基于數(shù)值模擬,結合生產(chǎn)現(xiàn)場實驗,驗證僅通過成形極限圖評判準則來判定板件起皺狀態(tài)的不完備性;針對此類產(chǎn)品平緩面塑性成形起皺問題,基于板料成形進料原理,提出型面臺階法和工藝凹包法來優(yōu)化設計前期的拉延局部工藝造型,達到阻礙材料過早進入產(chǎn)品型腔的目的,解決局部起皺缺陷;針對試�，F(xiàn)場局部微小起皺缺陷,提出更為簡便、可操作性強的加強起皺區(qū)域周邊的拉延筋,打磨變薄風險點圓角(后序整形整回)的方法改善缺陷,并進行實際試沖壓試制,通過對比板件拉延結束狀態(tài)以及最終產(chǎn)品結果,進一步驗證了該方案的有效性。
[Abstract]:Based on the numerical simulation and the field experiment, it is verified that the incompleteness of the wrinkling state of the plate is judged only by the criterion of the forming limit diagram. In view of the wrinkling problem of this kind of products, based on the feed principle of sheet metal forming, this paper puts forward the die surface step method and the process concave method to optimize the design of the drawing local process modeling in the early stage, so as to prevent the material from entering the product cavity prematurely. To solve the local wrinkling defect, to improve the defect by strengthening the drawing bar around the wrinkling area and grinding the risk point of thinning round angle (the whole back order shaping), the method of improving the defect is put forward, which is more convenient and more operable to strengthen the drawing bar around the wrinkling area, aiming at the local small wrinkling defect in the field of the test mould. The effectiveness of the scheme is further verified by comparing the end state of sheet metal drawing and the final product results.
【作者單位】： 合肥工業(yè)大學材料科學與工程學院;
【基金】：國家自然科學基金資助項目(51275146)
【分類號】：TG386;U466
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本文編號：2125718