Advanced Line-Heating Process for Hull-Steel Assembly

2000 ◽  
Vol 16 (02) ◽  
pp. 121-132
Author(s):  
Morinobu Ishiyama ◽  
Yoshihiko Tango
Keyword(s):  
Steel Plate ◽  
Steel Plates ◽  
Heating Process ◽  
The Finite Element Method ◽  
Line Heating ◽  
Thermal Forming ◽  
Computer Aided ◽  
Hull Steel ◽  
Advanced Line ◽  
Automated Line

Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI) has successfully employed the logic of the Finite Element Method on the principle of Thermal Forming or Line Heating, which facilitates use of computer aided, fully automated line heating machines for forming any curvature precisely and efficiently on a hull steel plate in the shipbuilding process. It is undesirable for the future in line heating that only an experienced technician is able to be skilled in the use of existing line heating f1 or steel plate forming. Accuracy of shape formed by existing line heating is not necessarily well controlled and work at succeeding stages is adversely affected by inaccurate interim products, though it is a very useful method informing steel plates and all apparatus required for line heating is just light tools. The IHI-Advanced Line-heating Process for Hull-steel Assembly (IHI-ALPHA) has succeeded in solving these problems.

Heating Path Generation and Simulation for Ship Plate Steel

2011 ◽  
Vol 421 ◽  
pp. 250-253
Author(s):  
Hu Zhu ◽  
Xiao Guang Yang
Keyword(s):  
Steel Plate ◽  
Simulation System ◽  
Simulation Software ◽  
Heating Process ◽  
Path Generation ◽  
Plate Steel ◽  
Heating Equipment ◽  
Line Heating ◽  
Steel Base

To lay the foundation of the automation for line heating forming, a method for heating path generation and simulation for ship plate steel base on STL mode was proposed in this paper. The line heating path was generated by slicing the STL model of the steel plate using a series of planes, and the models of the heating equipment of ship plate steel were build, and the heating process of ship plate steel can be simulated by inputting the models of the heating equipment into the simulation system that was built by using VC++ and OpenGL. The case study shows that the method can primely solve the inconvenient of manual heating and the whole heating process can be observed by the simulation so that the heating process can be made a reasonable monitoring, and the heating path generation and simulation software are runs stably and reliably.

scholarly journals NUMERICAL ANALYSIS OF CORRUGATED STEEL PLATE BRIDGE WITH REINFORCED CONCRETE RELIEVING SLAB

2015 ◽  
Vol 22 (5) ◽  
pp. 585-596 ◽  
Author(s):  
Damian BEBEN ◽  
Adam STRYCZEK
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Steel Plate ◽  
Numerical Models ◽  
Experimental Tests ◽  
Bridge Engineering ◽  
Steel Plates ◽  
The Finite Element Method ◽  
Calculation Results ◽  
Rc Slab

The paper presents a numerical analysis of corrugated steel plate (CSP) bridge with reinforced concrete (RC) relieving slab under static loads. Calculations were made based on the finite element method using Abaqus software. Two computation models were used; in the first one, RC slab was used, and the other was without it. The effect of RC slab to deformations of CSP shell was determined. Comparing the computational results from two numerical models, it can be concluded that when the relieving slab is applied, substantial reductions in displacements, stresses, bending mo­ments and axial thrusts are achieved. Relative reductions of displacements were in the range of 53–66%, and stresses of 73–82%. Maximum displacements and bending moments were obtained at the shell crown, and maximum stresses and axial thrusts at the quarter points. The calculation results were also compared to the values from experimental tests. The course of computed displacements and stresses is similar to those obtained from experimental tests, although the absolute values were generally higher than the measured ones. Results of numerical analyses can be useful for bridge engineering, with particular regard to bridges and culverts made from corrugated steel plates for the range of necessity of using additional relieving elements.

Prediction of Deformations of Steel Plate by GEP in Forming Process

2012 ◽  
Vol 544 ◽  
pp. 268-273
Author(s):  
Lei Yang ◽  
Liang Gao
Keyword(s):  
Mathematical Model ◽  
Influencing Factors ◽  
Steel Plate ◽  
Heating Process ◽  
Forming Process ◽  
Line Heating ◽  
Main Method ◽  
Plate Deformation ◽  
Final Deformation

Line heating is the main method for forming compound curved shells of hull. The accuracy of final deformation and the productivity depend on the experience of the workers. To predict the plate deformation, the explicit mathematical model for deformation and the main influencing factors by FEA and GEP is established in this paper. The main influencing factors in line heating process were analyzed firstly. Then, 16 group deformation results of steel plate under the five main influencing factors were obtained by FEA. At last, the explicit mathematical model for deformation and the main influencing factors was established.

An Embedded Prototype for a Distributed and Automated Line Heating System

2009 ◽  
Vol 25 (04) ◽  
pp. 182-190 ◽  
Author(s):  
Jackyou Noh ◽  
Jong Gye Shin ◽  
Kwang Hee Ko ◽  
Jae An Chun
Keyword(s):  
Robot Control ◽  
Heating System ◽  
Heating Process ◽  
Current Line ◽  
Line Heating ◽  
Design Data ◽  
Heating Systems ◽  
Network Information ◽  
Automated Process ◽  
Automated Line

Automated line heating systems have been developed based on stand-alone operation with no consideration of the extensibility and maintainability. In the line heating shop, many of the line heating works are performed simultaneously; therefore, a collaborative and simultaneous automated line heating system is needed. In order to develop such a new line heating system, the current line heating process was analyzed, and then a distributed and automated process was determined, and the parts to be distributed and automated were identified to propose a distributed and automated line heating system based on modularization and network. Information and data flow from production design to robot control have been analyzed and integrated in the system. The system has two main processes: the calculation of the line heating information and execution of a working unit without calculation. A prototype of the system has been developed to study the feasibility of the system. Tests were carried out by using real production design data of a middle-sized Korean shipyard.

A Comprehensive Line-Heating Algorithm for Automatic Formation of Curved Shell Plates

2004 ◽  
Vol 20 (02) ◽  
pp. 69-78 ◽  
Author(s):  
Jong Gye Shin ◽  
Cheol Ho Ryu ◽  
Jong-Ho Nam
Keyword(s):  
Heating Process ◽  
Heat Sources ◽  
Line Heating ◽  
Heating Facility ◽  
Measuring Methods ◽  
Process Line ◽  
Automated Line ◽  
Automatic Formation ◽  
Surface Comparison

Line heating is a method used in the production of highly curved plates in the shipbuilding process. Line-heating process is generally regarded as one of the outdated technologies in the modernized and automated shipbuilding process. No piece of information in the line-heating process is either quantified or computerized. These drawbacks have restricted the automation of line-heating process and, as a result, the entire shipbuilding process. Therefore, a new automated line-heating process based on quantitative and computerized heating information has been sought. This paper describes a comprehensive algorithm for an automated line-heating process. By focusing on the overview of the complete algorithm, this paper integrates the components of the algorithm that have been separately published by the authors. The overall procedure of the automated line-heating process, including shell piece modeling, shell development, cylindrical approximation for curved plates, computation of heating information, and measurement and surface comparison, is discussed. The comprehensive algorithm is adjustable for different heat sources and measuring methods, without incurring fundamental changes in algorithm. The proposed line-heating algorithm has been implemented and transferred to some shipyards for customized applications. Simulation of automated line-heating facility

scholarly journals Development of 780 MPa Grade Steel Plate with Low Yield Ratio by Microstructural Control Through the On-Line Heating Process

Materia Japan ◽  
2009 ◽  
Vol 48 (1) ◽  
pp. 26-28
Author(s):  
Keiji Ueda ◽  
Shinichi Suzuki ◽  
Shinji Mitao ◽  
Takayuki Ito ◽  
Teruhisa Kinugawa
Keyword(s):  
Steel Plate ◽  
Yield Ratio ◽  
Heating Process ◽  
Line Heating ◽  
On Line ◽  
Grade Steel ◽  
Microstructural Control

Automatic Line-Heating Process for Forming the Double-Curved Shell Plates

2009 ◽  
Vol 25 (01) ◽  
pp. 7-13
Author(s):  
Ji Wang ◽  
Yujun Liu ◽  
Zhuoshang Ji ◽  
Yanping Deng ◽  
Jun Zhang
Keyword(s):  
Loop System ◽  
Automatic Line ◽  
Heating Process ◽  
Prediction System ◽  
Plate Surface ◽  
Technological Parameters ◽  
Line Heating ◽  
Information Measuring ◽  
Automated Line

An automatic line-heating process for the double-curved shell plates is introduced. This process contains four subprocesses: calculating the heating information based on shell development and analysis of primary technological parameters, which is named as prediction system of heating information; heating the plate by an automated line-heating machine according to the calculated heating information; measuring and inspecting the plate surface to determine whether it matches the designed surface; and calculating the reheating information for the deformed plate and reheating the plate automatically until the designed shape is achieved. Therefore, an iterative loop system of an automated line-heating process can be developed based on the integration of these four components.

Development of 780MPa Grade Steel Plate by Microstructural Control Containing M-A through the On-Line Heating Process

2010 ◽  
Vol 638-642 ◽  
pp. 3555-3560 ◽  
Author(s):  
Keiji Ueda ◽  
Shinichi Suzuki ◽  
Shinji Mitao ◽  
Nobuo Shikanai ◽  
Takayuki Ito
Keyword(s):  
Heating Temperature ◽  
Bainitic Ferrite ◽  
High Strength ◽  
Steel Plates ◽  
Accelerated Cooling ◽  
Heating Process ◽  
Line Heating ◽  
On Line ◽  
Grade Steel ◽  
Microstructural Control

High strength steel plates with 780MPa in tensile strength, suitable for building construction use, have been developed. The steel plates provide excellent combination of high strength, toughness, deformability and weldability. The key technology to obtain the excellent combination in mechanical properties of the steel is the microstructural control of M-A (martensite-austenite constituent) and the bainitic ferrite dual-phase structure, through the on-line heat treatment immediately after the accelerated cooling in Thermo-mechanical control process (TMCP). The developed steel plates have microstructure of fine M-A dispersed in the bainitic ferrite matrix. Basic metallurgical research revealed that the transformation behavior and microstructural morphologies were varied with the cooling stop temperature before the on-line heating, and the on-line heating temperature itself. Trial production of the developed 780MPa grade steel plates was also carried out with the plate mill. The obtained plates showed the satisfactory combination of high strength, low yield ratio, toughness.

The Design and Simulation of Circuit for Electromagnetic Force Assisted Line Heating Device

2013 ◽  
Vol 652-654 ◽  
pp. 2010-2018
Author(s):  
Ji Wang ◽  
Qiang Liu ◽  
Yu Jun Liu ◽  
Bing Shi ◽  
Ye Dong Bao ◽  
...  
Keyword(s):  
Electromagnetic Force ◽  
Coupling Model ◽  
Steel Plates ◽  
Field Analysis ◽  
Heating Process ◽  
Line Heating ◽  
Element Analysis ◽  
Heating Device ◽  
Pulsed Electromagnetic ◽  
Design Ideas

In the process of line heating, a pulsed electromagnetic force is added to steel plates as an approximately consecutive constrained force of certain frequency. It improves the condition of steel plates heated at high temperatures and the efficiency of steel deformation and be conducive to the control of process and the improvement for the accuracy of deformation. According to the actual needs of electromagnetic force assisted line heating process, the design ideas of circuit for the electromagnetic force assisted line heating device (EFALHD) and functions of the branch circuits are introduced. The distribution of the electromagnetic force and parameters’ influence rules are analyzed by building magnetic field and circuit coupling model in ANSYS. By adding thermal analysis on the electromagnetic field analysis, a new method of line heating finite element analysis is established to support the parameter determinations of EFALHD.

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