基于高频感应技术的船体曲面弯板成型的研究

Research on Hull Plate Bending Based on the Technology of High-Frequency Induction

基于高频感应加热原理,建立了船体曲面高频感应弯板成型的圆形高斯加热热源模型。通过不同加热速度下参考点温度的模拟计算值和试验测量值的对比,验证了该热源模型的可靠性。研究了板材厚度及扫描速度等影响因素对弯板成型的影响。结果表明,随着板厚的增加,横向收缩逐渐减小;板材横向角变形主要取决于热输入(加热速度)及板厚(温度差)。对于给定的板厚均存在某个热输入数值(或加热速度),使得角变形最大,另一方面,随着加热速度的增加,平板横向收缩变形逐渐减小;平板横向角变形的变化趋势则比较复杂,试验和数值计算都表明,横向角变形在热源移动速度v=300mm/min时取极值。

Based on the principle of high-frequency induction heating, a circular Gaussian heat source model for circular induction coil is built and applied to hull plate bending. Through a comparison of the temperature on reference points between numerical calculation and experimental measurement under different heating rates, the reliability of this heat source model is verified. Influence of plate thickness and scanning speed on bending forming is investigated. It is shown that lateral contraction decreases gradually with the increase of thickness, while lateral angle of sheet deformation mainly depends on heat input （heating rate） and thickness （temperature difference）. For certain thickness, there exists a heat input value （heating rate） which makes the biggest angle distortion. On the other hand, with the increase of heat source movement speed, plate transverse contraction deformation decreases gradually. Variation of flat angle of lateral deformation is more complex, and it is shown by both experiment and calculation that lateral angular distortion reaches a maximum at 300 mm/min of heat source movement speed.