本文選題：高強(qiáng)鋼 + 連續(xù)軋制變截面板�。� 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著汽車的輕量化、安全性和防撞性能要求越來越高,采用熱沖壓成形將高強(qiáng)鋼連續(xù)軋制變截面板(Tailor Rolled Blanks,TRB)應(yīng)用于汽車零部件的生產(chǎn)技術(shù)應(yīng)運(yùn)而生,其生產(chǎn)的零部件根據(jù)不同部位的承載能力需求具有不同的厚度,可以從材料和結(jié)構(gòu)雙重角度上實(shí)現(xiàn)汽車輕量化。但TRB厚度具有不均勻性,其熱沖壓成形過程中零件的破裂和起皺等缺陷比較突出,因此對高強(qiáng)鋼TRB熱沖壓的成形極限進(jìn)行深入研究尤為重要,而以盒形件為典型件研究其成形極限對探討其他復(fù)雜汽車覆蓋件的的成形極限具有普遍指導(dǎo)意義。根據(jù)B1500HS熱拉伸應(yīng)力-應(yīng)變曲線建立了高強(qiáng)鋼TRB與溫度、應(yīng)變速率和厚度相關(guān)的本構(gòu)關(guān)系模型。以連續(xù)損傷力學(xué)和細(xì)觀損傷力學(xué)為基礎(chǔ),推導(dǎo)出高強(qiáng)鋼B1500HS TRB熱成形的Lemaitre和Rice-Tracey韌性斷裂準(zhǔn)則,通過數(shù)值模擬與試驗(yàn)相結(jié)合的方法求取了韌性斷裂準(zhǔn)則中的材料參數(shù)。利用ABAQUS進(jìn)行了不同壓邊力、TRB板厚差、TRB過渡區(qū)長度下的高強(qiáng)鋼TRB盒形件熱沖壓成形數(shù)值模擬�；陧g性斷裂準(zhǔn)則對ABAQUS進(jìn)行了二次開發(fā),將韌性損傷模型嵌入數(shù)值模擬結(jié)果中得到了不同熱沖壓條件下高強(qiáng)鋼TRB盒形件的熱沖壓成形極限預(yù)測值。設(shè)計(jì)了試驗(yàn)?zāi)＞吆蚑RB壓邊力控制系統(tǒng),搭建了高強(qiáng)鋼TRB盒形件熱沖壓試驗(yàn)臺(tái)。通過試驗(yàn)研究了熱沖壓工藝參數(shù)和板料結(jié)構(gòu)形式對高強(qiáng)鋼TRB盒形件熱沖壓成形極限的影響規(guī)律,對比實(shí)驗(yàn)和數(shù)值模擬的成形極限結(jié)果驗(yàn)證了數(shù)值模擬預(yù)測方法的準(zhǔn)確性,得出Lemaitre韌性斷裂準(zhǔn)則可以較準(zhǔn)確的預(yù)測板料熱成形的破裂位置同時(shí)其成形極限預(yù)測誤差在6.35%以內(nèi)。進(jìn)一步分析熱沖壓參數(shù)對成形極限的影響原因,得到了高強(qiáng)鋼TRB盒形件熱沖壓的合理工藝參數(shù)。
[Abstract]:With the light weight of automobile, the requirement of safety and anti-collision performance is more and more high, the hot stamping forming is used to apply Tailor Rolled Blanksn TRB to the production technology of automobile parts and components. According to the different load capacity requirements of different parts, the components can be used to realize automotive lightweight from the angle of material and structure. However, the thickness of TRB is non-uniform, and the defects such as fracture and wrinkle of the parts in hot stamping process are obvious, so it is very important to study the forming limit of hot stamping of high strength steel TRB. The study on the forming limit of box-shaped parts is of general significance for the study of the forming limit of other complex automobile panels. Based on the thermal tensile stress-strain curve of B1500HS, the constitutive relation model of TRB with temperature, strain rate and thickness is established. Based on continuous damage mechanics and meso-damage mechanics, the Lemaitre and Rice-Tracey ductile fracture criteria for hot forming of high strength steel B1500HS TRB are derived. The material parameters in the ductile fracture criterion are obtained by means of numerical simulation and test. Numerical simulation of hot stamping forming of TRB box of high strength steel with different thickness difference of TRB plate and length of TRB transition zone was carried out by Abaqus. Based on the ductile fracture criterion, Abaqus is redeveloped, and the numerical simulation results of ductile damage model are embedded in the numerical simulation results to obtain the hot forming limit prediction value of TRB box parts of high strength steel under different hot stamping conditions. The test die and TRB blank holding force control system were designed, and the hot stamping test bench for TRB box parts of high strength steel was built. The influence of hot stamping process parameters and sheet metal structure on the forming limit of TRB box parts of high strength steel is studied through experiments. The accuracy of numerical simulation prediction method is verified by comparing the forming limit results of experiment and numerical simulation. It is concluded that the Lemaitre ductile fracture criterion can accurately predict the fracture position of sheet metal hot forming and the prediction error of forming limit is less than 6.35%. The influence of hot stamping parameters on forming limit is further analyzed and the reasonable process parameters of hot stamping for TRB box parts of high strength steel are obtained.
【學(xué)位授予單位】：哈爾濱工業(yè)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：2093776