Effect of Coil Width on Deformed Shape and Processing Efficiency during Ship Hull Forming by Induction Heating

Abstract

The main hull of a ship is made up of a large number of plates with complex curvatures. Line heating is one of the main approaches used in the forming of a ship hull plate. Because line heating is based on manual heating using a handheld oxyacetylene gun, the typical heating width is extremely narrow. With the development of computer control technology, a newly developed automated plate forming equipment is available and its heat source is typically an electromagnetic induction coil. The temperature field and the induction coil size are correlated. However, investigations into the induction coil size are scarce. In this study, the effect that the induction coil width has on both the forming shape and processing efficiency is investigated via simulation and test. The results show that a moderate expansion of the induction coil width at different input powers has an insignificant impact on forming shapes that is attainable by common line heating. However, as the heating width expands with the expansion of the induction coil width, the number of the processing lines via line heating is reduced which improves the processing efficiency.

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

“…In this paper, it was considered that the workpiece was made of carbon steel, the coil was made of copper, and the material of the core was ferrite. The material properties refer to Dong's [11] data. The whole model, loads, and mesh division are shown in Figure 3 (the air field is excluded).…”

“…In the mechanical analysis, we read the temperature distribution result obtained in the heat transfer calculation. The material of the plate was carbon steel, and the material properties refer to Dong's [11] data and are shown in Table 1. The hardening criteria for the material used a linear hardening model; a bilinear curve represents the strain-stress properties.…”

“…Lee [10] investigated the deformation behavior of induction line heating, and the fixed air gap was considered. Dong [11,12] investigated the effect of the coil width on the processing efficiency and indicated that the processing efficiency increases along with the coil width. Moreover, Dong proposed a simplified heat source model for induction heating, which is verified when the plate is without curvature.…”

Electromagnetic Modeling and Thermal Analysis of a Non-Axisymmetric System for Induction Brazing

“…It can be noted that the two experiments were performed by using two different coil configurationsthree turns for copper and one turn for stainless steel. In order to better match to our model, we decided to decrease the coil current for the steel-to-steel study while our coil had three turns for both cases [16][17][18].…”

Study on the Preparation Technology of a Ceramic Panel with a Magnetic Interlayer for an Induction Cooker

“…Compared with other heating techniques such as flame heating and resistance heating, induction heating technology has been widely used due to its advantages of fast heating, high thermal efficiency, cleanliness, safety, and accurate control [2][3][4]. In recent years, with the introduction of new national laws and regulations on energy and environmental protection, and an increase in people's awareness of energy conservation and environmental protection, induction heating technology has made great progress in the kitchen appliance industry [5,6].…”