本文關鍵詞： 冷彎成形 C型鋼 均勻試驗設計 非接觸式應變測量 剪切質量　出處：《寧波大學》2017年碩士論文　論文類型：學位論文

【摘要】：C型鋼作為金屬骨架,廣泛應用于建筑行業(yè),其質量和使用壽命直接影響著建筑工程的安全。因此,對C型鋼成形質量的研究顯得十分必要。影響成形質量除了工藝參數外,還有型鋼切斷環(huán)節(jié)的斷面質量。由于檢測手段的有限,關于產品的檢測多是通過目測,對其內部質量的好壞和局部的成形細節(jié)并沒有成熟的判定指標,冷彎成形技術在行業(yè)中仍停留在一個處處靠經驗設計的階段,這嚴重影響著我國冷彎成形技術的發(fā)展。本文以MSC.Marc和Deform為有限元軟件的平臺,分別建立了冷彎成形的仿真模型和模剪模型,采用實驗和仿真相結合的方法,對C型鋼從板材成形到切斷的全過程進行了仿真和實驗驗證,對成形的工藝參數、剪切工藝參數對成形質量的影響規(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、內三層進行了成形應力和應變的分析,得到了成形過程的應力應變分布的規(guī)律。(2)分析了成型角增量,軋輥間距和進給速度這三項因素對成形質量的影響,選取軋輥間距和進給速度進行了五水平的均勻試驗設計,并對比了與正交試驗設計的優(yōu)缺點,發(fā)現了兩因素對成形質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,并對模型進行了大量的網格局部細化分,通過剪切相關工藝參數的仿真及斷面質量的分區(qū)域分析以及實驗驗證,得到了工藝參數對剪切成形質量的影響規(guī)律。(4)采用非接觸式應變測量的方法對成形應變進行了測量,并與仿真模型的預測結果進行了對比,驗證了仿真模型的可靠性,提供了成形質量的測量指標;此外,對冷彎成形的殘余應力進行了測量,得到了C型鋼殘余應力的分布規(guī)律。本文研究結果為提高C型鋼的冷彎成形質量提供了重要的理論依據。
[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.
【學位授予單位】：寧波大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG306

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