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.
Highlights
During ship manufacturing, many plates with complex curvatures must be formed for the main hull of a ship, which is a time-consuming process
Ueda [1,2] investigated the pattern of ship hull plates forming by line heating, discussed the heating line deployment principle and the heating criteria based on the theory of inherent strain, and verified and modified the path produced via induction heating
Once the applicability of the finite element computing method has been validated by the test results, the finite element method is employed to study the effect of coil dimensions on forming shape results, the finite element method is employed to study the effect of coil dimensions on forming shape and processing efficiency by modifying the coil dimension and calculating the number of heating lines and processing efficiency by modifying the coil dimension and calculating the number of heating required to produce a specific deformation shape in the plate
Summary
Many plates with complex curvatures must be formed for the main hull of a ship, which is a time-consuming process. During this process, the line heating method creates local contraction deformation in a plate via a localized heating source, of which width is significantly narrower in size than the plate length or width as this processing method is based on moving a handheld oxyacetylene gun over a processed plate. After the accuracy of the finite element method is validated, the effect of the induction coil sizes on the plate deformation shape and curvature distribution under induction heating, and the variation of processing efficiency versus induction coil sizes are investigated via numerical simulation. Efficiency means the time required to process the same shape of a plate under different induction coil sizes
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