【摘要】：汽車車身輕量化是降低汽車能耗的有效措施之一。采用高強(qiáng)度鋼板制造汽車零部件,車身減重同時可提高碰撞安全性。高強(qiáng)度鋼板通常采用熱沖壓工藝,即在高溫下沖壓成形后在模具上進(jìn)行保壓淬火,最終獲得熱沖壓零件。本文以高強(qiáng)度22Mn B5硼鋼板和基于22Mn B5設(shè)計的Q-P鋼(以下統(tǒng)稱97#鋼)為研究對象,進(jìn)行熱沖壓實驗,選取合理工藝參數(shù),并設(shè)計用以對22Mn B5硼鋼板進(jìn)行熱沖壓的車門防撞梁零件的熱沖壓模具及其冷卻系統(tǒng),研究內(nèi)容結(jié)果如下:1優(yōu)化了熱沖壓工藝參數(shù):奧氏體化溫度950℃,奧氏體化時間5min,保壓時間60s。結(jié)果表明,在優(yōu)化后的工藝參數(shù)條件下,工件抗拉強(qiáng)度可達(dá)到1600MPa,延伸率為11±1%。相比于目前商用22Mn B5熱沖壓件,工件抗拉強(qiáng)度提高了100MPa左右,延伸率提高了3~5%。2.對97#鋼熱沖壓工藝參數(shù)進(jìn)行選擇,在淬火過程中,在模具200℃下等溫處理5min,可獲得抗拉強(qiáng)度可達(dá)到1975MPa,延伸率為10.4%,強(qiáng)塑積達(dá)到20GPa·%的綜合性能優(yōu)異的工件。3.通過對汽車車門防撞梁零件特征分析,綜合熱沖壓模具設(shè)計要求,對車門防撞梁熱沖壓模具的關(guān)鍵參數(shù)(模具材料、凸凹模間隙、沖壓方向等)進(jìn)行了選擇,設(shè)計了車門防撞梁熱沖壓模具。4.通過多場耦合的數(shù)值模擬分析方法對車門防撞梁熱沖壓模具冷卻系統(tǒng)進(jìn)行了研究。研究結(jié)果表明,冷卻管路距模具型面的間距H對模具、工件的冷卻效果的影響最大,其次為管路間距S,管路直徑D的影響程度最小。幾何參數(shù)的影響其本質(zhì)為:更多冷卻水均勻地靠近工件時,換熱效果越好。
[Abstract]:The lightweight of automobile body is one of the effective measures to reduce the energy consumption of automobile. The automobile parts are made of high strength steel plate, and the weight loss of the body can improve the collision safety at the same time. The hot stamping process is usually used for high strength steel plate, that is to say, the hot stamping parts can be obtained by holding pressure quenching on the die after stamping at high temperature. In this paper, high-strength 22Mn B5 boron steel and 22Mn B5-based QZP steel (97 # steel) as the research object, the hot stamping experiment is carried out, and the reasonable technological parameters are selected. The hot stamping die and its cooling system of the door anti-collision beam parts used for hot stamping of 22Mn B5 boron steel plate are designed. The research results are as follows: 1 the hot stamping process parameters are optimized as follows: austenitizing temperature 950 鈩，

本文編號：2473672