【摘要】：以寶鋼生產(chǎn)的14種規(guī)格和牌號的鋼板為研究對象,對其V彎成形特性進(jìn)行了研究,通過單向拉伸實驗,獲得材料的基本力學(xué)性能,分析了試驗材料的V彎回彈規(guī)律。試驗結(jié)果表明,材料存在正、負(fù)回彈,相同彎曲角度下隨彎曲半徑增大,回彈量增加且趨向正回彈,在相同彎曲半徑下,彎曲角度增大,回彈量減小且趨向負(fù)回彈,可通過調(diào)整彎曲角度或彎曲模具圓角大小來可合理控制零件回彈;在相同厚度條件下,當(dāng)材料抗拉強(qiáng)度大于600 MPa時,回彈量顯著增大;在相同強(qiáng)度條件下,回彈量隨彎曲角度的增大而趨向負(fù)回彈,同時隨著彎曲半徑的變大,回彈量隨材料厚度產(chǎn)生的差異趨緩,并趨向正回彈;980 MPa強(qiáng)度級別材料中材料厚度越小,不同彎曲半徑下的回彈量差異變大;厚度相同的情況下,QP鋼和MS鋼的回彈量比DP鋼更趨向于正回彈;數(shù)值擬合發(fā)現(xiàn),回彈角度隨R/T值的增大而增大,且經(jīng)歷一個由負(fù)到正的過程。隨著彎曲角度的增大,擬合曲線下移且斜率變小,只有當(dāng)R值足夠大時才會出現(xiàn)正回彈。
[Abstract]:Taking the steel plate of 14 specifications and grades produced by Baosteel as the research object, the V bending forming characteristics of the steel plate were studied. The basic mechanical properties of the material were obtained by unidirectional tensile test, and the V bending springback rule of the test material was analyzed. The experimental results show that the material has positive and negative springback. The springback increases with the increase of bending radius at the same bending angle and tends to positive springback. Under the same bending radius, the bending angle increases, and the springback decreases and tends to negative springback. The springback of the parts can be reasonably controlled by adjusting the bending angle or the fillet size of the bending die. At the same thickness, when the tensile strength of the material is greater than 600 MPa, the springback of the material increases significantly. Under the same strength condition, the springback amount tends to negative springback with the increase of bending angle, at the same time, with the increase of bending radius, the difference between springback quantity and material thickness tends to slow down, and tends to positive springback. Under the same thickness, the springback of QP steel and MS steel tends to be more positive than that of DP steel, when the thickness of the material is smaller than that of DP steel, and the springback of QP steel and MS steel is larger than that of DP steel when the bending radius is the same. The numerical fitting results show that the springback angle increases with the increase of R _ (t) value and goes through a process from negative to positive. With the increase of bending angle, the fitting curve moves downward and the slope decreases. Only when the R value is large enough, there will be a positive rebound.
【作者單位】： 寶山鋼鐵股份有限公司研究院;汽車用鋼開發(fā)與應(yīng)用技術(shù)國家重點實驗室(寶鋼);
【分類號】：TG142.1

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