【作者】 包叶冬；

【导师】 刘玉君； 汪骥；

【作者基本信息】 大连理工大学 ， 船舶与海洋结构物设计制造， 2011， 硕士

【摘要】 在船体曲面外板的成形加工过程中,水火弯板工艺一直是世界各国的造船厂普遍使用的成形方法。由于水火弯板工艺是利用金属板局部加热和冷却过程中内部产生的热应力来实现弯曲变形的,因而对于较厚或曲率变化较大钢板的成形效果不佳,往往需要将钢板反复加工；而对于高强钢这样的容易产生裂纹的材料,水火弯板工艺存在着控制加工温度和达到所需变形的矛盾。针对水火弯板技术存在的这些不足,本文提出利用电磁力辅助水火弯板成形的新方法。本文运用有限元分析软件ANSYS实现了对电磁力辅助水火弯板成形过程的模拟。首先建立电路—电磁耦合有限元模型,模拟电磁线圈的放电过程,得到了线圈中放电电流的变化规律和电磁力的时空特性；建立电磁—结构耦合有限元模型,实现电磁力的加载,并得到钢板的应变情况。接着考虑温度对电磁力的影响,并将温度作为载荷施加于钢板结构中,模拟得到了钢板在温度和电磁力共同作用下的应变情况,分析了电磁力对水火弯板成形的作用机理。最后,分析了放电回路参数和几何参数的变化对电磁力的影响,为后续的研究提供必要的理论参考。更多还原

【Abstract】 In the process of ship curved plate forming, line heat forming technique has been used as the most popular forming method by shipyards all over the world. For line heat forming, bend deformation occurs when metal plate internally produces heat stress in the process of local heating and cooling, so the forming effect become poor when the steel plate is thick or seriously bend. The steel plate needs to be processed many times. For high-strength steel which is apt to produce crack, the line heat forming technique has a contradiction between keeping the temperature not too high and achieving the expectant deformation. As a result of these disadvantages line heat forming technique has, a new method of aiding line heat forming with electromagnetic force is put forward in this paper.This paper simulates the process of aiding line heat forming with electromagnetic force by using finite element (FE) analysis software ANSYS. First of all, to establish electromagnetic-circuit coupled FE model, simulate the discharging process of electromagnetic coil, gain the variation laws of discharging current in coil and the characteristic of electromagnetic force in period and space; to establish electromagnetic-structure coupled FE model, load the electromagnetic force, gain strain situation of steel plate. Then to consider the influence of temperature to electromagnetic force, load temperature to steel plate structure, gain the strain of steel plate under the action of temperature and electromagnetic force, analyze the action mechanism of electromagnetic force to line heat forming.Finally, to analyze the influence of discharging circuit parameters and geometrical parameters to electromagnetic force, provide theory reference for further research.更多还原