【摘要】：輥彎成形是一種通過軋輥將板材逐漸彎曲成為型材的工藝。目前輥彎成形有限元仿真的材料性能數(shù)據(jù)主要來自于金屬板材拉伸試驗(yàn)得出的力學(xué)性能數(shù)據(jù),而拉伸力學(xué)性能不能夠全面準(zhǔn)確的表現(xiàn)金屬板材在彎曲成形過程中的應(yīng)力應(yīng)變狀態(tài)。在輥彎成形仿真過程中,材料模型的選擇對(duì)板材最終回彈角度起決定作用。本文設(shè)計(jì)一種彎曲試驗(yàn),獲得板材彎曲變形時(shí)的應(yīng)力應(yīng)變數(shù)據(jù)以提高仿真的準(zhǔn)確性。本文首先進(jìn)行拉伸試驗(yàn)以獲得DP980高強(qiáng)鋼板材拉伸力學(xué)性能。并使用專門設(shè)計(jì)的彎曲試驗(yàn)裝置,將拉伸試驗(yàn)機(jī)縱向運(yùn)動(dòng)轉(zhuǎn)換為試樣的彎曲變形,并配合三維應(yīng)變測量儀對(duì)試樣的彎曲變形過程進(jìn)行測量,得到DP980高強(qiáng)鋼板材在彎曲變形時(shí)的彎矩曲率特性,并將其彎矩曲率數(shù)據(jù)轉(zhuǎn)換為板材在彎曲狀態(tài)下的應(yīng)力應(yīng)變數(shù)據(jù)。建立三點(diǎn)彎、輥彎成形有限元仿真模型,將仿真過程中彎角區(qū)應(yīng)力、應(yīng)變數(shù)據(jù)與兩側(cè)平板區(qū)應(yīng)力應(yīng)變數(shù)據(jù)做對(duì)比,分析三點(diǎn)彎與輥彎成形工藝的成形特點(diǎn)。對(duì)DP980高強(qiáng)鋼板材進(jìn)行三點(diǎn)彎試驗(yàn)、輥彎成形試驗(yàn),并與其對(duì)應(yīng)的有限元仿真結(jié)果進(jìn)行對(duì)比。結(jié)果表明,導(dǎo)入彎曲模型的仿真可以更加準(zhǔn)確的預(yù)測板材在三點(diǎn)彎、輥彎成形過程中的回彈角度;可知,從彎曲試驗(yàn)得出的力學(xué)性能能夠更準(zhǔn)確的描述以彎曲變形方式為主的三點(diǎn)彎、輥彎成形工藝特性,基于材料彎曲性能數(shù)據(jù)建立的有限元仿真模型可以提高三點(diǎn)彎、輥彎成形過程仿真的準(zhǔn)確性。
[Abstract]:Roll forming is a process in which the sheet metal is gradually bent into a profile by roll. At present, the material performance data of the finite element simulation of roll forming mainly come from the mechanical property data obtained from the tensile test of metal sheet. But tensile mechanical properties can not fully and accurately express the stress and strain state of sheet metal in bending process. In the process of roll forming simulation, the choice of material model plays a decisive role in the final springback angle of sheet metal. In this paper, a bending test is designed to obtain the stress-strain data of sheet metal during bending deformation to improve the accuracy of simulation. In this paper, tensile test was first carried out to obtain tensile mechanical properties of DP980 high-strength steel sheet. With the specially designed bending test device, the longitudinal motion of the tensile testing machine is converted into the bending deformation of the specimen, and the bending deformation process of the specimen is measured with a three-dimensional strain measuring instrument. The bending moment curvature characteristics of DP980 high strength steel sheet during bending deformation are obtained, and the moment curvature data are converted into the stress-strain data of the plate under bending condition. The finite element simulation model of three point bending and roll bending is established. The stress and strain data of corner region are compared with the stress and strain data of both sides of flat plates in the simulation process, and the forming characteristics of three point bending and roll bending forming process are analyzed. The three point bending test and roll forming test of DP980 high strength steel sheet were carried out, and the results were compared with the corresponding finite element simulation results. The results show that the simulation with bending model can predict the springback angle of sheet metal in the process of three-point bending and roll bending more accurately. It can be seen that the mechanical properties obtained from the bending tests can more accurately describe the process characteristics of three-point bending and roll bending, and the finite element simulation model based on the material bending performance data can improve the three-point bending. Accuracy of roll forming simulation.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG142.14

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