本文選題：旋壓成形　切入點：旋輪　出處：《山東科技大學(xué)》2017年碩士論文

【摘要】：旋壓是一種先進的塑性加工成形技術(shù),廣泛應(yīng)用于航空航天、軍工生產(chǎn)、機械工程以及日用品生產(chǎn)等行業(yè)中,具有變形力小、節(jié)約原材料、制品強度高等優(yōu)點。近年來,國內(nèi)許多學(xué)者對旋壓技術(shù)進行了研究,主要集中于工藝方法對旋壓制品質(zhì)量的影響,而對旋輪工作狀態(tài)的研究較少。因此,本文基于彈塑性力學(xué)理論,采用有限元方法研究了旋輪在旋壓過程中的力學(xué)行為和磨損機理,并對鋁合金錐形件旋壓進行了實驗研究。采用有限元分析軟件DEFORM-3D,對鋁合金錐形件的變薄旋壓工藝進行了有限元模擬。利用二步法,先建立了錐形件旋壓過程有限元模型,對旋壓過程進行了模擬,得到了旋輪的受力數(shù)據(jù);然后建立了旋輪受力模型,將第一步所得的受力數(shù)據(jù)施加于旋輪上,分析旋壓過程中旋輪的受力狀態(tài)。并對比了不同減薄率和旋輪進給速率下旋輪的應(yīng)力和變形量的變化規(guī)律;結(jié)果表明,減薄率對旋輪最大應(yīng)力和最大變形量的影響較為顯著且呈正相關(guān)性;旋輪進給速率與旋輪最大應(yīng)力和最大變形量之間并非正相關(guān)關(guān)系。建立了旋輪的磨損模型,對旋輪在旋壓過程中的磨損情況進行了模擬。分析了旋輪工作面上磨損帶的演化過程。對比了旋輪在不同初始硬度、摩擦系數(shù)以及旋輪進給速率下的最大磨損量,分析了旋輪在不同工況下的磨損形式的變化規(guī)律;結(jié)果表明提高旋輪的初始硬度、降低摩擦系數(shù)可以顯著減小磨損量,在一定范圍內(nèi)適當(dāng)調(diào)整旋輪進給速率也可以有效降低旋輪的最大磨損量。采用數(shù)控旋壓實驗平臺成功旋壓出了鋁合金錐形件,通過對比旋壓實驗過程中采集的旋輪載荷數(shù)據(jù)與數(shù)值模擬結(jié)果發(fā)現(xiàn),實驗結(jié)果與數(shù)值仿真結(jié)果變化趨勢一致,驗證了本文建立的旋壓過程有限元模型的有效性。
[Abstract]:Spinning is an advanced plastic forming technology, which is widely used in aerospace, military production, mechanical engineering and commodity production, with the advantages of small deformation, saving raw materials, high strength of products and so on.In recent years, many domestic scholars have studied spinning technology, mainly focusing on the effect of process methods on the quality of spinning products, but less on the working state of spinning wheel.Therefore, based on the theory of elastic-plastic mechanics, the mechanical behavior and wear mechanism of rotating wheel during spinning are studied by finite element method, and the spinning of aluminum alloy conical parts is studied experimentally.The thin spinning process of aluminum alloy tapered parts was simulated by finite element analysis software DEFORM-3D.By using the two-step method, the finite element model of the spinning process of the conical part is established, and the stress data of the spinning wheel are obtained by simulating the spinning process, and then the force model of the rotary wheel is established, and the force data obtained from the first step are applied to the rotary wheel.The stress state of the wheel during spinning is analyzed.The effect of thinning rate on the maximum stress and maximum deformation of rotary wheel is significant and positive correlation is obtained by comparing the variation of stress and deformation under different thinning rate and feed rate of the rotary wheel, and the results show that the effect of thinning rate on the maximum stress and the maximum deformation of rotary wheel is significant.There is no positive correlation between the feed rate and the maximum stress and deformation of the rotary wheel.The wear model of rotary wheel was established, and the wear of rotary wheel during spinning was simulated.The evolution process of wear zone on rotary wheel face is analyzed.In this paper, the maximum wear amount of the rotary wheel under different initial hardness, friction coefficient and feed rate is compared, and the wear patterns of the rotary wheel under different working conditions are analyzed, the results show that the initial hardness of the rotary wheel is improved.Reducing the friction coefficient can significantly reduce the wear rate of the rotary wheel, and adjust the feed rate of the rotary wheel in a certain range can also effectively reduce the maximum wear rate of the rotary wheel.Aluminum alloy conical parts were successfully spun by numerical control spinning experiment platform. By comparing the data of wheel load collected during spinning experiment with the numerical simulation results, it was found that the experimental results were consistent with the numerical simulation results.The validity of the finite element model of spinning process established in this paper is verified.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG306

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本文編號：1705593