不同厚度下船舶板材高频感应自由弯曲成形

Free Bending of Ship Plate of Different Thickness on High-Frequency Induction

应用ANSYS软件建立高频感应自由弯曲有限元模型,研究了船板高频感应成形板厚对可加热温度、变形角度、应力、变形及冷却后的残余应力的影响。结果表明:不同厚度的船舶板材可加热温度皆在860℃以上进入奥氏体温度区。在无约束、忽略船板自重的情况下,不同厚度的船舶板材单面弯曲角度在10-2数量级;加热结束后,不同厚度的船舶板材的应力都达到屈服应力,发生了塑性变形。冷却结束后残余应力主要集中在线圈正下方。随着板厚的增加,可加热温度下降,并在中厚板区有波动;弯曲角度先增加,后减小;最大残余应力先减小,后增加。在给定加热频率和功率条件下,船板的高频感应加热变形的最有效厚度为14 mm。

In this paper,a FEM model of high-frequency induction free bending is established;the heated temperature,stress,deformation,residual stress and bending angle after cooling,etc are studied on different thickness ship plate.The results show that the steel plate can be heated to 860℃ above the austenitic temperature.Bending angle of ship plates of different thickness in one-sided is 10-2 degree in the case of the absence of constraints and ignoring ship plate weight.The stresses are to the yield stress and promote plastic deformation of different thickness after the high-frequency heating.When the plate is cooled,the residual stress will mainly be concentrated at the bottom of the coil.Heating temperature is gradually decreased with some fluctuations in the slab area.The maximum bending angle first increases and then decreases;the maximum stress first decreases and then increases as the thickness increases.Under the conditions of a given frequency and power,the best result of deformation thickness of plate is 14mm in high-frequency induction heating.