本文關(guān)鍵詞： 冷彎成形 C型鋼 均勻試驗(yàn)設(shè)計(jì) 非接觸式應(yīng)變測(cè)量 剪切質(zhì)量　出處：《寧波大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：C型鋼作為金屬骨架,廣泛應(yīng)用于建筑行業(yè),其質(zhì)量和使用壽命直接影響著建筑工程的安全。因此,對(duì)C型鋼成形質(zhì)量的研究顯得十分必要。影響成形質(zhì)量除了工藝參數(shù)外,還有型鋼切斷環(huán)節(jié)的斷面質(zhì)量。由于檢測(cè)手段的有限,關(guān)于產(chǎn)品的檢測(cè)多是通過目測(cè),對(duì)其內(nèi)部質(zhì)量的好壞和局部的成形細(xì)節(jié)并沒有成熟的判定指標(biāo),冷彎成形技術(shù)在行業(yè)中仍停留在一個(gè)處處靠經(jīng)驗(yàn)設(shè)計(jì)的階段,這嚴(yán)重影響著我國(guó)冷彎成形技術(shù)的發(fā)展。本文以MSC.Marc和Deform為有限元軟件的平臺(tái),分別建立了冷彎成形的仿真模型和模剪模型,采用實(shí)驗(yàn)和仿真相結(jié)合的方法,對(duì)C型鋼從板材成形到切斷的全過程進(jìn)行了仿真和實(shí)驗(yàn)驗(yàn)證,對(duì)成形的工藝參數(shù)、剪切工藝參數(shù)對(duì)成形質(zhì)量的影響規(guī)律展開了系統(tǒng)研究:(1)建立薄壁型的體單元模型,并將其劃分為外、中、內(nèi)三層進(jìn)行了成形應(yīng)力和應(yīng)變的分析,得到了成形過程的應(yīng)力應(yīng)變分布的規(guī)律。(2)分析了成型角增量,軋輥間距和進(jìn)給速度這三項(xiàng)因素對(duì)成形質(zhì)量的影響,選取軋輥間距和進(jìn)給速度進(jìn)行了五水平的均勻試驗(yàn)設(shè)計(jì),并對(duì)比了與正交試驗(yàn)設(shè)計(jì)的優(yōu)缺點(diǎn),發(fā)現(xiàn)了兩因素對(duì)成形質(zhì)量影響程度的大小及影響規(guī)律。(3)采用三維體單元建立了C型鋼剪切的模型,并對(duì)模型進(jìn)行了大量的網(wǎng)格局部細(xì)化分,通過剪切相關(guān)工藝參數(shù)的仿真及斷面質(zhì)量的分區(qū)域分析以及實(shí)驗(yàn)驗(yàn)證,得到了工藝參數(shù)對(duì)剪切成形質(zhì)量的影響規(guī)律。(4)采用非接觸式應(yīng)變測(cè)量的方法對(duì)成形應(yīng)變進(jìn)行了測(cè)量,并與仿真模型的預(yù)測(cè)結(jié)果進(jìn)行了對(duì)比,驗(yàn)證了仿真模型的可靠性,提供了成形質(zhì)量的測(cè)量指標(biāo);此外,對(duì)冷彎成形的殘余應(yīng)力進(jìn)行了測(cè)量,得到了C型鋼殘余應(yīng)力的分布規(guī)律。本文研究結(jié)果為提高C型鋼的冷彎成形質(zhì)量提供了重要的理論依據(jù)。
[Abstract]:As a metal skeleton, C section steel is widely used in the construction industry. Its quality and service life directly affect the safety of building engineering. Therefore, it is necessary to study the forming quality of C section steel. Due to the limited means of testing, the inspection of products is mostly through visual testing, and there are no mature criteria for determining the quality of the products and the local forming details. The cold forming technology is still in the stage of experience design in the industry, which seriously affects the development of cold forming technology in China. In this paper, MSC.Marc and Deform are taken as the finite element software platform. The simulation model and die shear model of cold forming are established respectively. The whole process from sheet forming to cutting is simulated and experimentally verified by the method of combining experiment and simulation. The influence of shearing process parameters on the forming quality was studied systematically. (1) the thin-walled body element model was established, and it was divided into three layers: outer, middle and inner, and the forming stress and strain were analyzed. The influence of forming angle increment, roll spacing and feed speed on the forming quality is analyzed. Five levels of uniform test design of roll spacing and feed speed are carried out. Comparing with the advantages and disadvantages of orthogonal design, it is found that the influence of two factors on the forming quality and the influence law are found. The model of C section steel shear is established by using three dimensional body element, and a large number of mesh local refinements are carried out on the model. Based on the simulation of shear parameters and the sectional analysis of cross section quality and experimental verification, the influence of process parameters on shear forming quality is obtained. (4) the non-contact strain measurement method is used to measure the forming strain. Compared with the prediction results of the simulation model, the reliability of the simulation model is verified, and the measurement index of forming quality is provided. In addition, the residual stress of cold forming is measured. The distribution of residual stress in C section steel is obtained. The results of this paper provide an important theoretical basis for improving the forming quality of C section steel.
【學(xué)位授予單位】：寧波大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG306

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