Bending force prediction for dynamic roll-bending during 3-roller conical bending process

2014 ◽  
Vol 16 (2) ◽  
pp. 284-295 ◽  
Author(s):  
M.K. Chudasama ◽  
H.K. Raval
Keyword(s):  
Force Prediction ◽  
Bending Force ◽  
Roll Bending ◽  
Bending Process

Comparison of Analytical Models of Force Prediction during Dynamic Bending Stage for 3-Roller Conical Bending Process

2014 ◽  
Vol 1016 ◽  
pp. 150-155
Author(s):  
Mahesh Chudasama ◽  
Harit K. Raval
Keyword(s):  
Shear Stress ◽  
Analytical Model ◽  
Optimum Design ◽  
Experimental Results ◽  
Analytical Models ◽  
Force Prediction ◽  
Bending Force ◽  
Bending Process ◽  
Dynamic Bending ◽  
Bottom Roller

Conical bending process using three rollers with different configurations is a widely used process for manufacturing conical sections and shells in the industries. The process involves static as well dynamic stages. For optimum design of the machine, accurate analytical model of the force prediction is required for static as well dynamic bending stages. In this paper the analytical models considering three different stress conditions have been compared with the experimental results. The observations of the comparison have been reported. It is concluded that for higher bottom roller inclination, the shear stress has to be considered for evaluation of bending force whereas for lower bottom roller inclination it can be neglected.

Experimental study on the cross-shear roll bending process

2021 ◽  
Author(s):  
Mengrou Lv ◽  
Lianhong Zhang ◽  
Baiyan He ◽  
Feiping Zhao ◽  
Senlin Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Roll Bending ◽  
Bending Process ◽  
The Cross

HEAT-ASSISTED ROLL-BENDING PROCESS DYNAMIC SIMULATION

2013 ◽  
Vol 33 (1) ◽  
Author(s):  
Tran H. Quan ◽  
Henri Champliaud ◽  
Zhengkun Feng ◽  
Jamel Salem ◽  
Dao T. My
Keyword(s):  
Dynamic Simulation ◽  
Process Dynamic ◽  
Roll Bending ◽  
Bending Process

Object-Oriented Development of an Integrated System for Manufacturing Information of Roll Bending Process

2002 ◽  
Vol 18 (02) ◽  
pp. 86-91
Author(s):  
Jong Gye Shin ◽  
Sun il Won ◽  
Cheol Ho Ryu ◽  
Hyunjune Yim ◽  
Jang Hyun Lee
Keyword(s):  
Object Oriented ◽  
Integrated System ◽  
Software System ◽  
Object Oriented Method ◽  
General Shape ◽  
Roll Bending ◽  
Bending Process ◽  
Manufacturing Information ◽  
Integrated Software ◽  
Program Modules

An integrated software system was developed for the manufacturing information of the roll bending process for ship hull pieces. To this end, the information flow in the process was studied and designed using the object-oriented method. Separate program modules, obtained by introducing new approaches or modifying existing methods, were integrated to yield a software system that can provide all the manufacturing information required for the roll bending of hull pieces of general shape. The information includes roll orientations, roll lines, roll region, and the center roller movement. Two examples are presented to demonstrate the performance of the developed software. The software developed in this work is expected to provide a solid basis for the automated and efficient fabrication of hull pieces. Also, the object-oriented models developed here will be of great use for further study of ship production.

Investigation of Size Effects on Process Models for Plane Strain Microbending

2006 ◽  
Author(s):  
Richard M. Onyancha ◽  
Brad L. Kinsey
Keyword(s):  
Size Effects ◽  
Strain Distribution ◽  
Past Research ◽  
Peak Force ◽  
Process Models ◽  
Analytical Models ◽  
Linear Strain ◽  
Bending Force ◽  
Bending Process ◽  
Individual Grains

Accurate process models provide vital information in the design of manufacturing processes. To characterize bending operations, analytical models have been developed and shown to predict the peak bending forces fairly accurately for sheets in the macro or mesoscale (i.e. sheets with a large number of grains through the thickness). However, whether these models also accurately predict bending forces for sheets in the microscale (i.e. sheets with approximately ten grains or less through the thickness) has not been evaluated. The present study is aimed at investigating the use of two such models from previous work with microscale bending data. In addition, using these previous models as a foundation, additional bending force models were developed to predict the bending force specifically for microscale bending operations. Data analysis showed that the process models from past research, which provide accurate results for macroscale bending, over predict the peak force required for bending microscale sheets. These process models assume a non-linear strain distribution through the thickness and a curved formed wall. The two models developed in this research provide accurate results for the microscale bending tests, however, they under predict the peak force for the macroscale bending operation. These developed process models assume a linear strain distribution through the thickness and a straight formed wall. The linear strain distribution is more appropriate for the microscale bending process as there are few grains through the thickness and the strain in individual grains varies linearly across the grain. The straight formed wall is more appropriate for the microscale bending process as there is not sufficient distance to warrant a curved formed wall assumption. These differences represent size effects for assumptions in the process models. The material used for these investigations was Brass (CuZn15). The sheets had between 2 and 50 grains through the thickness with grain sizes of between 10 μm and 71 μm.

scholarly journals Analysis and Control of Twist Defects of Aluminum Profiles with Large Z-Section in Roll Bending Process

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 31 ◽  
Author(s):  
Anheng Wang ◽  
Hongqian Xue ◽  
Emin Bayraktar ◽  
Yanli Yang ◽  
Shah Saud ◽  
...  
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Element Model ◽  
Effective Control ◽  
Curvature Radius ◽  
3D Fem ◽  
Fe Method ◽  
Element Analysis ◽  
Roll Bending ◽  
Bending Process

This paper focuses on the twist defects and the control strategy in the process of four-roll bending for aluminum alloy Z-section profiles with large cross-section. A 3D finite element model (3D-FEM) of roll bending process has been developed, on the premise of the curvature radius of the profile, the particularly pronounced twist defects characteristic of 7075-O aluminum alloy Z-section profiles were studied by FE method. The simulation results showed that the effective control of the twist defects of the profile could be realized by adjusting the side roller so that the exit guide roll was higher than the entrance one (the side rolls presented an asymmetric loading mode with respect to the main rolls) and increasing the radius of upper roll. Corresponding experimental tests were carried out to verify the accuracy of the numerical analysis. The experimental results indicated that control strategies based on finite element analysis (FEA) had a significant inhibitory function on twist defects in the actual roll bending process.

Study on flexible two-axis roll-bending process for component with non-circular section

2019 ◽  
Vol 33 (9) ◽  
pp. 4421-4429
Author(s):  
Tao Zhang ◽  
Huapu Sha ◽  
Shihong Lu ◽  
Chao Du ◽  
Peng Chen
Keyword(s):  
Circular Section ◽  
Roll Bending ◽  
Bending Process

Experimental analysis of an asymmetrical three-roll bending process

2015 ◽  
Vol 83 (9-12) ◽  
pp. 1823-1833 ◽  
Author(s):  
Jamel Salem ◽  
Henri Champliaud ◽  
Zhengkun Feng ◽  
Thien-My Dao
Keyword(s):  
Experimental Analysis ◽  
Roll Bending ◽  
Bending Process
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