Efficient Algorithms for Inspection and Reforming of Double-Curved Plates in Line-Heating Process

2006 ◽  
Vol 22 (03) ◽  
pp. 184-193
Author(s):  
Yujun Liu ◽  
Zhuoshang Ji ◽  
Yanping Deng ◽  
Jun Zhang ◽  
Ji Wang
Keyword(s):  
Manufacturing Process ◽  
Three Dimensional ◽  
Efficient Algorithms ◽  
Heating Process ◽  
Line Heating ◽  
Technical Parameters ◽  
Error Analyses ◽  
Metal Plates ◽  
Plate Formation ◽  
Prospective Application

Line heating is an effective and economical method for forming metal plates into three-dimensional shaped plates for ships, trains, and airplanes. When a curved plate subject to deformation is formed in line-heating process, the deformed shape is repeatedly inspected and reformed to reach the designed shape. Efficient automatic inspection and reforming processes are essential to enhance productivity in the whole manufacturing process. In this paper, efficient algorithms for inspection and reforming of double-curved plates are introduced. These algorithms have been developed to automatically inspect the transverse and longitudinal shape of plate surfaces and provide technical parameters to reform the unformed plates. The longitudinal shape of the plate surface is examined based on a shell plate development with plastic deformation during the plate formation, and the transverse shape is inspected through error analyses of transverse curvature radiuses. How to use the inspection results to reform unformed plates is discussed. In the end, experiments are performed with comparison to the current industrial plate manufacture, and results show a prospective application of our algorithms to the practical manufacturing of doublecurved plates. The methods presented in this study may play a role in realizing the automation of the entire curved-plate manufacturing process.

Development of Computer-Aided Process Planning System for Plate Bending by Line Heating (Report 3)—Relation Between Heating Condition and Deformation

1994 ◽  
Vol 10 (04) ◽  
pp. 248-257 ◽  
Author(s):  
Yukio Ueda ◽  
Hidekazu Murakawa ◽  
Ahmed Mohamed Rashwan ◽  
Isao Neki ◽  
Ryoichi Kamichika ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Planning System ◽  
Heating Process ◽  
Plate Bending ◽  
Heating Condition ◽  
Line Heating ◽  
Computer Aided Process Planning ◽  
Dimensional Finite Element ◽  
General Relations ◽  
Three Dimensional Finite Element

An effective plate bending process by line heating can be achieved when the heating conditions are properly selected to produce desirable bending or inplane deformations. To make such decisions on he heating condition, the relation between heating conditions and deformations must be clarified. For his purpose, the authors studied the similarity rule which holds for the line heating process and derived wo parameters governing the deformations. Also, they developed new three-dimensional finite-element method codes as versatile tools to replace costly experiments. The validity of these codes is examined through comparison with an experiment, and they are applied to study the general relations between he parameters and the deformations of plates.

The Line Heating Temperature Field Theory Analysis and Numerical Simulation

2013 ◽  
Vol 316-317 ◽  
pp. 1087-1093
Author(s):  
Wei Zheng Xu ◽  
Shao Chun Zheng ◽  
Xu Dong Han
Keyword(s):  
Temperature Field ◽  
Waste Heat ◽  
Heating Temperature ◽  
Three Dimensional ◽  
Absorption Efficiency ◽  
Transient Temperature ◽  
Heating Process ◽  
Line Heating ◽  
Linear Partial Differential Equations ◽  
Gas Flame

This paper analyzed the endothermic efficiency of the plate in line heating process combing with the need of researching on the recovery of waste heat in the gas flame process. Firstly the non-linear partial differential equations of three-dimensional transient temperature field were derived with the analysis of hexahedron in the plate. Then the temperature field of the plate was numerically simulated using gaussian heat source heat flux model with ANSYS software. Finally the heat absorption efficiency formula of the plate was derived based on the finite volume method. The endothermic efficiency model in this paper provides a basis for further analysis of the whereabouts of the heat released in line heating process in theory.

Modified Strip Model for Analyzing the Line Heating Method-Part 1: Elastic Plates

1991 ◽  
Vol 35 (02) ◽  
pp. 172-182
Author(s):  
Jong Gye Shin ◽  
Amiram Moshaiov
Keyword(s):  
Strain Field ◽  
Three Dimensional ◽  
Past Research ◽  
Stress Fields ◽  
Transient Temperature ◽  
Heating Process ◽  
Elastic Strip ◽  
Elastic Plates ◽  
Line Heating ◽  
Heating Method

The line heating method can be most useful in the automation of plate forming and for removal of undesired residual distortions during shipbuilding. The three-dimensional transient temperature and stress fields complicate the problem of simulating the line heating process. In past research efforts, a strip model taken perpendicular to the heated line was used. However, recent experimental and theoretical works have demonstrated the need for a different model. Recognizing that the existing strip model cannot be used effectively in the analysis of the stress-strain field during the line heating process, a modified strip model is suggested. In Part 1 of this paper, the concept of a modified strip is introduced by developing a theory for an elastic modified strip. The results of selected examples show that the modified strip model gives excellent results for elastic plates in comparison with a regular strip model. In Part 2 (to be published in a later issue of JSR), the theory is extended to the thermo-elastic-plastic modified strip. The concept of a modified elastic strip may have other useful applications and therefore is highlighted separately.

Evaluation of Parts Produced by a Novel Additive Manufacturing Process

2013 ◽  
Vol 315 ◽  
pp. 63-67 ◽  
Author(s):  
Muhammad Fahad ◽  
Neil Hopkinson
Keyword(s):  
Additive Manufacturing ◽  
Rapid Prototyping ◽  
Manufacturing Process ◽  
High Speed ◽  
Three Dimensional ◽  
Coordinate Measuring Machine ◽  
Layer By Layer ◽  
Nylon 12 ◽  
Measuring Machine ◽  
End Use

Rapid prototyping refers to building three dimensional parts in a tool-less, layer by layer manner using the CAD geometry of the part. Additive Manufacturing (AM) is the name given to the application of rapid prototyping technologies to produce functional, end use items. Since AM is relatively new area of manufacturing processes, various processes are being developed and analyzed for their performance (mainly speed and accuracy). This paper deals with the design of a new benchmark part to analyze the flatness of parts produced on High Speed Sintering (HSS) which is a novel Additive Manufacturing process and is currently being developed at Loughborough University. The designed benchmark part comprised of various features such as cubes, holes, cylinders, spheres and cones on a flat base and the build material used for these parts was nylon 12 powder. Flatness and curvature of the base of these parts were measured using a coordinate measuring machine (CMM) and the results are discussed in relation to the operating parameters of the process.The result show changes in the flatness of part with the depth of part in the bed which is attributed to the thermal gradient within the build envelope during build.

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.

Coupling Numerical Simulation of Resin Matrix Composites about Temperature and Degree of Cure Fields by Hot-Press Forming

2013 ◽  
Vol 788 ◽  
pp. 43-47
Author(s):  
Fei Sun ◽  
Dun Ming Liao ◽  
Peng Xu ◽  
Chang Chun Dong
Keyword(s):  
Three Dimensional ◽  
Exothermic Peak ◽  
Resin Matrix ◽  
Transient Temperature ◽  
Heating Process ◽  
Curing Process ◽  
Hot Press ◽  
Degree Of Cure ◽  
Resin Matrix Composite ◽  
The Impact

In this paper, a coupled numerical model of three-dimensional transient temperature field and degree of cure field for resin matrix composite curing process was developed. Using this model the hot-press curing process of the plate-shaped composite parts were simulated with considering the impact of tools and auxiliary materials. Thus, the temperature and degree of cure fields distribution in the entire process cycle were obtained. Numerical results show that the curing of the composite has a certain sequence. At the beginning, the composite is first curing at the boundary and gradually to the center. At the end stage, because of the higher curing rate, the center released a large amount of heat which makes the boundary curing simultaneously with center. In addition, there is a significant exothermic peak during the curing process. And the peak temperature is higher when it was closer to the center. This research effectively provides reference for optimizing the heating process parameters to improve product quality.

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.

Development of Computer-Aided Process Planning System for Plate Bending by Line Heating (Report 1)—Relation Between Final Form of Plate and Inherent Strain

1994 ◽  
Vol 10 (01) ◽  
pp. 59-67 ◽  
Author(s):  
Yukio Ueda ◽  
Hidekazu Murakawa ◽  
Ahmed Mohamed Rashwan ◽  
Yasuhisa Okumoto ◽  
Ryoichi Kamichika
Keyword(s):  
Plastic Strain ◽  
Three Dimensional ◽  
Planning System ◽  
Plate Bending ◽  
Line Heating ◽  
Computer Aided Process Planning ◽  
Heating And Cooling ◽  
Process Planning System ◽  
Plan Making ◽  
Inherent Strain

Plate bending by line heating can be considered as a process in which plates are bent to three-dimensional form by the plastic strain caused during the gas heating and water cooling. Therefore, the plan making for this process can be separated into two parts. The first part is to decide what type and how much plastic strain should be applied on which location on the plate. The second part is to find what are the proper heating and cooling conditions to get the desired plastic strain. The authors investigated the relation between the final form of the plate and the plastic strain or the inherent strain to be applied for the plate bending. For this purpose, the finite-element method (FEM) is employed. Based on the knowledge obtained through the analysis, a method to determine the part of the plate to be heated and the magnitude of the required inherent strain is proposed.

CHARACTERIZATION AND ANALYSES ON RESIDUAL STRESS AND DEFORMATION DISTRIBUTION IN LINE HEAT PROCESS

2021 ◽  
Vol 158 (A4) ◽  
Author(s):  
B Zhou ◽  
X Han ◽  
W Guo ◽  
Z Liu ◽  
S-K Tan
Keyword(s):  
Residual Deformation ◽  
Element Model ◽  
Heating Process ◽  
Stress Distributions ◽  
Forming Process ◽  
Line Heating ◽  
Bending Process ◽  
Stress And Deformation ◽  
The Impact ◽  
Residual Stress And Deformation

Line heating is an important plate bending process that has been adopted in shipyards for more than 60 years. This paper presents the results of a numerical and experimental study on the residual deformation and stress distribution in the plate forming process using the line heating method. In this paper, a finite element model was used to simulate the heating process, and the model was validated using experimental results. The model was then used to analyze the deformation and stress distributions in the heating and non-heating region. The impact of line heating and sequence of heating on both sides of a steel plate was discussed. The findings of the study show that the compression stress generated help to increase the shrinkage of line heating process. This study presents a valuable reference for similar thermal process.

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