轧制差厚板方盒形件起皱缺陷研究

通过数值仿真与冲压实验研究了差厚板方盒形件的起皱缺陷,分析了差厚板方盒形件起皱缺陷的发生机理,讨论了压边力对差厚板起皱缺陷的影响.研究表明:差厚板方盒形件最容易发生起皱的部位是薄板侧的法兰直边区以及过渡区法兰部位,当厚板侧压边力过小时,厚侧法兰直边部分也有可能产生褶皱;在保证零件不产生破裂和较大的厚度过渡区位移的前提下,采用较大的压边力对于提高差厚板的抗皱性是非常有利的;而恒定的压边力类型对于抑制差厚板起皱是最为理想的.

Study on Wrinkle Defect in Square Box of Tailor Rolled Blank

The wrinkle defect in the square box of tailor rolled blank (TRB) was studied by numerical simulation and stamping experiment. The mechanism of producing such wrinkle defect in TRB square box was analyzed and the effect of the binder force on the wrinkle defect was discussed. The results indicate that the spots inclined to form the wrinkle in the TRB square box are the straight flange on the thinner side and the flange in the thickness transition zone. When the binder force on the thicker side is not great enough， the wrinkle could also form at the straight flange on the thicker side. Under the conditions of no crack and the large movement in the thickness transition zone， the larger binder force can help to improve the wrinkle resistance of TRB and when the binder force is constant the restriction of the wrinkle of TRB is the best.