Effect of Line Heating Factors on Transverse Shrinkage Generated by Triangle Heating

概要

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The transverse shrinkage of line heating has been studied using the theory of Torus models and the laser forming experiments. In order to automate line heating work, a basic technology for developing curved surfaces in ships and the transverse shrinkage generated by triangle heating needs to be evaluated quantitatively. The similarity law was applied to specimen of forming plates in order to change their scale from several meters to several millimeters. Laser forming experiments were conducted by varying the width, thickness, radius of width of the plate, line heating length, and travel speed. The numerical simulation of triangle heating based on FEM analysis was used to consider the effects of line heating factors, such as the radius of curvature in the transverse direction, water cooling, and heating length. The following results were obtained: (1) The conditions of triangle heating are given by taking the heating length to be greater than 0.35 times the plate width and changing the travel speed in three or more steps. (2) The radius of plate width does not affect the transverse shrinkage. (3) Water cooling behind the heating torch led to efficient shrinkage. (4) An equation for heat input for obtaining the estimated transverse shrinkage is proposed.
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