基于性能梯度分布的硼钢热冲压工艺对形状精度的影响

发布时间：2018-03-18 20:25

本文选题：材料合成与加工工艺　切入点：硼钢　出处：《吉林大学学报(工学版)》2017年06期 　论文类型：期刊论文

【摘要】：为探究性能梯度分布的热冲压零件的回弹机理,采用模具分区加热技术,对USIBOR1500P硼钢板进行U形件热冲压试验,并采用NDI三坐标测量仪PRO CMM3500分析了不同保压压力和模具温度下冲压件热区、冷区及过渡区的回弹规律,零件组织采用扫描电子显微镜进行观察。试验发现:随着保压压力的增大,热区、冷区和过渡区的回弹角均减小;随着模具温度的升高,冷区回弹角基本不变,热区和过渡区回弹角均减小,且过渡区的回弹程度在同样条件下比冷区和热区小。组织分析结果表明:马氏体组织越多回弹越大,贝氏体组织越多回弹越小。
[Abstract]:In order to investigate the springback mechanism of hot stamping parts with performance gradient distribution, the U-shaped hot stamping test of USIBOR1500P boron steel sheet was carried out by using the die partition heating technology. The springback laws of hot, cold and transition zones of stamping parts under different pressure holding pressure and die temperature are analyzed by PRO CMM3500, a NDI coordinate measuring instrument. The microstructure of the parts was observed by scanning electron microscope. It was found that the springback angle of the hot zone, cold zone and transition zone decreased with the increase of the pressure holding pressure, and the springback angle of the cold zone basically remained unchanged with the increase of die temperature. The springback angle of the hot zone and the transition zone are both decreased, and the springback degree of the transition zone is smaller than that of the cold zone and the hot zone under the same conditions. The results of microstructure analysis show that the more martensite microstructure is, the larger the springback is, and the smaller the bainite structure is.
【作者单位】：吉林大学材料科学与工程学院;吉林大学辊锻工艺研究所;
【基金】：国家自然科学基金项目(51205162,51275203) 吉林大学研究生创新基金项目(2017184)
【分类号】：TG306

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