本文選題：碟形封頭 + 拉延筋��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：封頭作為壓力容器的主要承壓零部件,廣泛應(yīng)用于航空、航天、鐵路、化工和核電等領(lǐng)域,具有加工技術(shù)條件要求高、制造工藝難度大、工藝復(fù)雜及生產(chǎn)周期長等特點(diǎn)。為提高經(jīng)濟(jì)效益,推動工業(yè)進(jìn)一步發(fā)展,對承壓容器和承壓零部件的使用性能提出了更高的要求,如適應(yīng)嚴(yán)酷工況對強(qiáng)度、韌性、沖擊性能、低溫性能、抗腐蝕等性能的要求,同時為了滿足承壓容器尺寸趨于大型化、使用壽命長、檢查維修更便捷等要求,對其制造工藝提出了更高的的要求。冷拉深工藝由于工藝簡單、生產(chǎn)成本較低成為目前研究的焦點(diǎn)。大型薄壁封頭的成形工藝是封頭沖壓成形研究的重難點(diǎn),研究的主要內(nèi)容是如何避免起皺、鼓包和破裂等成形缺陷。本文結(jié)合金屬塑性成形理論對封頭成形過程進(jìn)行研究,分析了成形缺陷的塑性力學(xué)原理。本文針對大型薄壁碟形封頭在實(shí)際冷拉深生產(chǎn)中遇到的成形缺陷問題,通過對常規(guī)分步拉深成形和引入拉延筋的一次拉深成形工藝進(jìn)行分析研究,提出了一種新的拉延筋應(yīng)用思路,同時分析了沖壓參數(shù)、模具設(shè)計和摩擦系數(shù)對成形缺陷的影響。利用Dynaform有限元軟件,確定具體的拉延筋設(shè)計參數(shù),并通過有限元軟件仿真計算和正交試驗(yàn),將沖壓成形工藝中各參數(shù)進(jìn)行優(yōu)化,并通過實(shí)驗(yàn)驗(yàn)證了新方案的可行性,解決了實(shí)際生產(chǎn)中的成形缺陷問題,實(shí)現(xiàn)了封頭一次拉深成形的工藝優(yōu)化。
[Abstract]:As the main pressure components of pressure vessel, the head is widely used in the fields of aviation, aerospace, railway, chemical industry and nuclear power. It has the characteristics of high requirement of processing technology, high difficulty in manufacturing process, complex process and long production cycle. In order to improve economic efficiency and promote the further development of industry, higher requirements have been put forward for the performance of pressure vessels and pressure components, such as the requirements for strength, toughness, impact performance, low temperature performance, corrosion resistance and so on. At the same time, in order to meet the requirements of large size, long service life and convenient inspection and maintenance of the pressure vessel, a higher requirement for its manufacturing process is put forward. Because of its simple process and low production cost, cold drawing process has become the focus of current research. The forming process of large thin-walled head is the most difficult point in the research of stamping forming. The main content of the research is how to avoid the forming defects such as wrinkling, bulging and cracking. Based on the theory of metal plastic forming, the forming process of head is studied in this paper, and the plastic mechanics principle of forming defect is analyzed. In this paper, aiming at the forming defects of large thin-walled disc head in cold drawing production, the conventional step drawing forming process and one drawing forming process with drawing bars are analyzed and studied. A new train of thought for application of drawing bars is proposed, and the influence of stamping parameters, die design and friction coefficient on forming defects is analyzed. The design parameters of drawing bars are determined by using Dynaform finite element software, and the parameters in stamping process are optimized by means of finite element software simulation and orthogonal test. The feasibility of the new scheme is verified by experiments. The problem of forming defects in practical production is solved, and the process optimization of first-time drawing is realized.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH49;TG386

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本文編號：1864954