轧制差厚板筒形件充液拉深成形影响因素的灰色关联分析

Grey relation analysis on influencing factors for hydroforming tailor rolled blank cylindrical parts

针对轧制差厚板零件在传统拉深成形工艺中易产生成形缺陷的问题,将充液拉深工艺引入轧制差厚板筒形件的成形中,并通过数值模拟技术对轧制差厚板充液拉深成形过程进行了研究。分析了液池压力对轧制差厚板成形性能的影响,并通过正交试验结合灰色理论讨论了不同工艺参数对轧制差厚板成形性能的影响规律。研究表明:充液拉深成形工艺相对于传统拉深成形工艺能够获取成形性能更好的轧制差厚板。随着液池压力的增加,轧制差厚板筒形件最大厚度减薄率呈现先减小后增大的趋势,而过渡区最大移动量逐渐减小,采用10 MPa的液池压力能够获取较小的最大厚度减薄率,并将过渡区最大移动量限制在较低水平。摩擦因数、压边力以及液池压力对于轧制差厚板充液拉深成形性能的影响程度是依次降低的,采用灰色关联分析获取的优化工艺参数组合可以提高轧制差厚板的成形性能。

For the problem that the tailor rolled blank(TRB) parts were prone to forming defects in the traditional deep drawing process,the hydroforming process was introduced into the forming process of TRB cylindrical parts,and the hydroforming process of TRB was studied by numerical simulation technology.Then,the influence of liquid pool pressure on the formability of TRB was analyzed,and the influencing laws of different process parameters on the formability of TRB were discussed by the orthogonal test combined with the grey theory.The research indicate that the TRB with better formability can be acquired by the hydroforming process compared with the traditional deep drawing process.As the liquid pool pressure increasing,the maximum thickness thinning rate of TRB cylindrical parts decreases first and then increases,and the maximum movement amount of transition zone gradually decreases.When the liquid pool pressure is 10 MPa,the maximum thickness thinning rate is smaller,and the maximum movement amount of transition zone is restricted to a low level.The influencing degree of friction factor,blank holder force and liquid pool pressure on the formability of TRB hydroforming decreases in turn,and the optimized process parameters combination obtained by grey correlation analysis can improve the formability of TRB.