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Development of Simulator for Plate Bending by Line-Heating

线加热板材弯曲模拟器的研制

基本信息

批准号：
04402036
负责人：
NOMOTO Toshiharu
金额：
$ 9.92万
依托单位：
The Uiversity of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

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.

造船业最具特色的工作就是厚钢板的弯曲加工。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）用于自动板材弯曲的具有多个活塞头的万能压力机2）基于造船技术的人工智能和专家系统的开发我们这项研究的目的是开发一种通过线加热进行板材弯曲的模拟器。线加热导致板材弯曲的原理可以解释如下。当板材从板表面的一侧加热时，在板厚方向上产生温度分布。这种温度分布会导致两种类型的变形。一是角变形，二是板内收缩。这些都是在线加热过程中引起的热塑性应变的结果。为了通过数值计算来模拟在线加热过程，在线加热过程的建模非常重要。因此，我们决定进行弹性有限元计算。因此模拟器系统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。有限元计算受到等效力矩和载荷的影响。施加引起角度变形的弯矩M和引起横向收缩的板内载荷F。因此用户可以直观地了解板弯曲并获得其专业知识。该模拟器对于技术人员的培训设施很有用。