Development of Simulator for Plate Bending by Line-Heating

在造船工业中最具特色的工作是弯曲厚钢板。人们常说板材弯曲技术是最困难的技术之一。为了解决这些技术问题，日本在过去的30年里进行了大量的研究1)多活塞头万能压力机的自动化弯板2)基于造船技术的人工智能和专家系统的开发本研究的目的是开发一个线加热弯板模拟器。板因加热而弯曲的原理可以解释如下。当从板表面的一侧加热板时，温度分布沿板厚方向产生。这种温度分布导致两种类型的变形。一种是角度变形，另一种是板内收缩。这是由于加热过程中产生的热塑性应变。为了通过数值计算对管道加热过程进行模拟，管道加热过程的建模是非常重要的。因此，我们决定进行弹性有限元计算。因此，模拟系统是基于简化的非线性弹性板弯曲模型，而不是热弹塑性和大变形分析。在等效弯矩和荷载作用下的有限元计算。施加引起角变形的弯矩M和引起横向收缩的板内荷载F。用户可以直观地了解板材弯曲，掌握板材弯曲技术。模拟器对技术人员的培训设施很有用。

The most characteristic work in shipbuilding industry is to bend thick-steel plates. It is often said that plate bending technique is one of the most difficult ones.In order to solve those technological problem, a lot of investigations were conducted in the past 30 years in Japan.1) The universal press with multiple piston heads for automate plate bending2) Development of the artificial intelligence and expert system based on shipbuilding skillsOur aim of this research is developing a simulator for plate bending by Line-Heating. The principle of plate bending due to line heating can be explained as follows. When a plate is heated from one side of plate surface, temperature distribution is produced in the direction of plate thickness. This temperature distribution causes two types of deformation. One is angular distortion and the other is in-plate shrinkage. Those are the results from thermal plastic strains induced during line heating process.In order to carry a simulation of line heating process by numerical calculation, modeling of line heating process is very important. Therefore, we decide to carry elastic finite element calculation. So the simulator system was based on a simplified non-linear elastic plate bending model instead of thermal elasto-plastic and large deformation analysis.The finite element calculation subjected to equivalent moment and load. Bending moment M which induces angular distortion and in-plate load F which induces transverse shrinkage are applied.So user can understand plate bending intuitively and acquire know-how of it. The simulator is useful to a training facility for technicians.