Effect of Plate Curvature on Heat Source Distribution in Induction Line Heating for Plate Forming

Abstract

Line heating is an essential process in the formation of ship hull plates with a complex curvature. Electromagnetic induction heating is widely used in the line heating process. In electromagnetic induction heating, the shape of the coil and the air gap between the inductor and workpiece could influence the heat source distribution. Moreover, in the line heating process, the change of curvature of the plate will cause a change of the air gap of the inductor. Magnetic thermal coupling calculation is an effective method for simulating induction heating. This paper used the finite element method to calculate the distribution of heat sources in different initial plate curvatures and coil widths. The changes in heat source distribution and its laws were investigated. The results show that when the coil width is less than 100 mm, the effect of plate curvature on heat source distribution and strain distribution is not apparent; when the coil width is greater than 100 mm, the plate curvature has a visible effect on the heat generation distribution. In the case of a curvature increasing from 0 to 1 and a coil width equal to 220 mm, the Joule heat generation in the center of the heating area is reduced by up to 21%.

Numerical Calculation of High-Strength-Steel Saddle Plate Forming Suitable for Lightweight Construction of Ships

“…The results of the two methods showed that the thermal deformation of the steel plate mainly depends on the plate thickness. For the induction heating of the steel plate, Chang et al [ 20 ] studied the effect of curvature on the heat source distribution in line heating. Wang et al [ 21 ] established a numerical calculation model of single-heating line for the forming of high-strength-steel sail plates and studied the effects of plate geometric and forming parameters on deformation.…”

Investigation of an Electrical System for Induction Heating of Cylindrical Parts with Different Sizes

“…In [2] a method for making branches in pipes using induction heating is described, as well as a study of thermal processes in a heated pipe. It was determined that for the design of such inductors, it is necessary to take into account the electromagnetic characteristics of the pipe material (non-magnetic or magnetic steel), the change in physical parameters with temperature (resistivity, thermal conductivity, heat capacity), hydraulic processes in the inductor (laminar / turbulent mode), mechanical processes [3].…”