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Prediction of Geometrical Error Due to Gas and Plasma Cuttings and Its Control

气体和等离子切削引起的几何误差预测及其控制

基本信息

批准号：
05650943
负责人：
MURAKAWA Hidekazu
金额：
$ 0.83万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650943/
关键词：
Gas Cutting Plasma Cutting Cutting Deformation Cutting Error Cutting Precision Finite Element Method Residual Stress Inherent Strain 有限要素性過渡変形

项目摘要

To achieve automation or mechanization of a ship structure assembling line, it is necessary to maintain much higher precision in each manufacturing stage, such as cutting and welding, compared to that required for a system which depends on skills of workers. Since flame cutting is the first stage of assembly and it determines a large part of the accuracy problems, the precision of flame cutting is the receiving more attention. Although it has long been considered that residual plastic strain and the motion of the plate due to the transient thermal deformation during cutting are the main causes of cutting error, hardly any studies have been conducted to investigate these factors theoretically and quantitatively. In this research, a computational method, based on thermal-elastic-plastic FEM,has been developed to simulate the cutting process. The proposed method is verified by comparing the computations with the experimental results obtained for plasma cutting.Using the FEM model, the residual plastic strain and the motion of the plate due to the transient thermal expansion are computed. Their effects on cutting error are quantitatively discussed. The results show that these factors have great influences on one-side cutting and small effects on two-side simultaneous cutting. The influences of the residual stress existing in the plate before cutting are also investigated.

为了实现船舶结构装配线的自动化或机械化，与依赖工人技能的系统相比，在每个制造阶段（例如切割和焊接）都必须保持更高的精度。由于火焰切割是装配的第一阶段，它决定了很大一部分的精度问题，因此火焰切割的精度越来越受到重视。虽然人们一直认为，残余塑性应变和运动的板由于瞬态热变形在切割过程中的主要原因是切割误差，几乎没有任何研究已经进行了理论和定量研究这些因素。在这项研究中，一种计算方法，基于热弹塑性有限元法，已被开发来模拟切削过程。通过等离子切割实验结果与计算结果的对比，验证了本文方法的有效性，并利用有限元模型计算了残余塑性应变和瞬态热膨胀引起的板材运动。定量地讨论了它们对切削误差的影响。结果表明，这些因素对单面切削影响较大，而对双面同时切削影响较小。还研究了板料切割前残余应力的影响。