The mechanical parameters modeling of heavy steel plate snake/gradient temperature rolling with the same roll diameters

2020 ◽  
Vol 117 (3) ◽  
pp. 301
Author(s):  
Lian-Yun Jiang ◽  
Tao Zhen ◽  
Guo Yuan ◽  
Jin-Bo Huang ◽  
Yao-Yu Wei ◽  
...  
Keyword(s):  
Shear Zone ◽  
Steel Plate ◽  
Rolling Force ◽  
Slip Zone ◽  
Analytic Model ◽  
Mechanical Parameters ◽  
Ansys Software ◽  
Relative Deviation ◽  
Maximum Relative Deviation ◽  
Rolling Torque

The grains in the center of the heavy steel plate can be refined by the snake/gradient temperature rolling, and the deformation penetration, the microstructure, and the properties of the steel plate will be improved. The existing rolling mechanical models are not suitable for the snake/gradient temperature rolling, so it is necessary to establish the mechanical parameters model of the snake/gradient temperature rolling to instruct production. The yield criterion of rolled material was modified based on the idea of equivalent flow stress. The element stress analyses were carried out based on the uniform normal stress and nonuniform shear stress in the vertical sides of each slab. Then the equilibrium equation of the unit pressure based on the slab method was established on this basis. The deformation region was divided into three layers (the top layer, the bottom layer, and the central layer) and maximum four zones (back slip zone, front slip zone, cross shear zone, and reverse deflection zone) according to the temperature distribution and position of the neutral point, and then the 12 zones were formed during the snake/gradient temperature rolling. The boundary conditions of the existence of the back slip zone, the front slip zone, and the cross shear zone were established according to the relationship between the threading angle and the neutral angle. The accurate mechanical parameters model of the rolling force and rolling torque of the snake/gradient temperature rolling with the same roll diameters was set up on this basis. The ANSYS software has been used in the rolling process simulation by many scholars, and the calculating precision has been verified. So the rolling processes were simulated by the ANSYS software to validate the model precision. The results show that the maximum relative deviation of the rolling force analytic model is less than 7% compared with the numerical method, and the maximum relative deviation of the rolling torque analytic model is less than 11% compared with the measured results. The mechanical parameters model can accurately predict the rolling force and rolling torque during the snake/gradient temperature rolling with the same roll diameters, so as to provide a theoretical basis for the design of rolling mill and the setup of the process parameters.

The analytic study on the heavy steel plate snake rolling with the different roll diameters

2019 ◽  
Vol 116 (4) ◽  
pp. 402 ◽  
Author(s):  
Qing-cheng Meng ◽  
Lian-yun Jiang ◽  
Li-feng Ma ◽  
Jun-yi Lei
Keyword(s):  
Shear Zone ◽  
Deformation Zone ◽  
Steel Plate ◽  
Rolling Force ◽  
Slip Zone ◽  
Mechanical Parameters ◽  
Rolling Method ◽  
Rolling Torque ◽  
Inner Region ◽  
Rolling Deformation

The deformation in the inner region along the thickness of the heavy steel plate can be improved by snake rolling method. Then the microstructure and property will be refined and the crack in the inner region may be avoided. So the in-depth research on snake rolling method mechanics parameter modeling should be conducted to guide production. The rolling deformation zone will be divided into back slip zone, cross shear zone, front slip zone and reverse deflection zone according to the direction of the friction during the snake rolling process. The four zones may not exist at the same time. The boundary conditions of existence of the back slip zone, cross shear zone and front slip zone were established by calculating the position of neutral point by a special method. The calculating models which were used to calculate the snake rolling mechanical parameters including the rolling force and rolling torque were setup. The calculated models of unit compressive pressure in the four zones were setup by the slab method, and at this basis, the accurate calculating models of the rolling force and rolling torque were setup according to the composition of the rolling deformation zone and the boundary condition. The mechanical parameters were calculated by the analytic method and the numerical method, and the relative deviation is less than 5% which can satisfy the industrial requirement. The present analytical model can predict the characteristics during snake rolling easily and quickly and it is also suitable for online control applications.

scholarly journals The Analytic Study on the Heavy Steel Plate Snake Rolling with the Same Roll Diameters

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Lian-yun Jiang ◽  
Qing-cheng Meng ◽  
Chun-jiang Zhao ◽  
Shou-xin Wang ◽  
Yan-wei Liu
Keyword(s):  
Steel Plate ◽  
Rolling Force ◽  
Rolling Process ◽  
Slip Zone ◽  
Mechanical Parameters ◽  
Rolling Method ◽  
Set Up ◽  
Rolling Torque ◽  
Inner Region ◽  
Rolling Deformation

The deformation in the inner region along the thickness of the heavy steel plate can be improved by snake rolling method. Then the microstructure and property will be refined and the crack in the inner region may be avoided. Therefore, the in-depth research on snake rolling method mechanics parameter modeling should be conducted to guide production. A snake rolling process with the same roll diameters and different angular velocity was conducted in this paper. The rolling deformation zone will be divided into back slip zone, front slip zone, cross shear zone, and reverse deflection zone according to the direction of the friction during the snake rolling process. The four zones may not exist at the same time. The boundary conditions of existence of the back slip zone, front slip zone, and cross shear zone were established according to the relationship between threading angle and neutral angle. The calculating models which were used to calculate the snake rolling mechanical parameters including the rolling force and rolling torque were set up. The calculated models of unit compressive pressure in the four zones were set up by the slab method, and on this basis the accurate calculating models of the rolling force and rolling torque were set up according to the composition of the rolling deformation zone and the boundary condition. The mechanical parameters were calculated by the analytical method and the numerical method, and the relative deviation is less than 6% which can satisfy the industrial requirement. The present analytical model can predict the characteristics during snake rolling easily and quickly and it is also suitable for online control applications.

Study on Minimum Rollable Thickness in Asymmetrical Rolling

2021 ◽  
Author(s):  
Ji Wang ◽  
Xianghua Liu
Keyword(s):  
Shear Zone ◽  
Deformation Zone ◽  
Rolling Force ◽  
Slip Zone ◽  
Speed Ratio ◽  
Slab Method ◽  
Roll Speed ◽  
Asymmetrical Rolling ◽  
New Model ◽  
Good Agreement

Abstract A new model for the asymmetrical rolling is proposed to calculate the minimum rollable thickness simply and fast by the slab method. The calculation formulas of the rolling pressure, the rolling force, the critical roll speed ratio and the critical front tension under different deformation zone configurations are proposed, and the deformation zone configuration - rolling parameters relationship diagram is given and analyzed. The results show that the minimum rollable thickness can be reached when the rolling parameters keep the deformation zone configuration as cross-shear zone + backward-slip zone (C+B) or all cross-shear zone (AC). The calculation formulas of the minimum rollable thickness and the required rolling parameters for different deformation zone configurations are proposed respectively. The calculated value is in good agreement with the experimental results.

scholarly journals New Numerical Solution of von Karman Equation of Lengthwise Rolling

2015 ◽  
Vol 2015 ◽  
pp. 1-20 ◽  
Author(s):  
Rudolf Pernis ◽  
Tibor Kvackaj
Keyword(s):  
Contact Stress ◽  
Rolling Force ◽  
Rolling Process ◽  
Normal Contact Stress ◽  
Normal Contact ◽  
Circular Arch ◽  
Relative Stress ◽  
Roll Flattening ◽  
Polygonal Curve ◽  
Rolling Torque

The calculation of average material contact pressure to rolls base on mathematical theory of rolling process given by Karman equation was solved by many authors. The solutions reported by authors are used simplifications for solution of Karman equation. The simplifications are based on two cases for approximation of the circular arch: (a) by polygonal curve and (b) by parabola. The contribution of the present paper for solution of two-dimensional differential equation of rolling is based on description of the circular arch by equation of a circle. The new term relative stress as nondimensional variable was defined. The result from derived mathematical models can be calculated following variables: normal contact stress distribution, front and back tensions, angle of neutral point, coefficient of the arm of rolling force, rolling force, and rolling torque during rolling process. Laboratory cold rolled experiment of CuZn30 brass material was performed. Work hardening during brass processing was calculated. Comparison of theoretical values of normal contact stress with values of normal contact stress obtained from cold rolling experiment was performed. The calculations were not concluded with roll flattening.

Optimization Design of Powder Molding Pressing Frame Based on Precision Effect

2010 ◽  
Vol 37-38 ◽  
pp. 791-796
Author(s):  
Jun Liu ◽  
Xin Long Dong ◽  
Gang Yi Zhou
Keyword(s):  
Finite Element Method ◽  
Optimization Design ◽  
Steel Plate ◽  
Plate Bending ◽  
Bending Rigidity ◽  
Ansys Software ◽  
Maximum Deformation ◽  
Support Plate ◽  
Deformation Area ◽  
Reduce Stress Concentration

The large deformation of powder molding pressing machine in the load affects the accuracy of the machine. The model of powder molding press was simplified by finite element method. ANSYS software was employed to simulate the location of the frame deformation in load, deformation and stress distribution of the real case. The sizes and structures of the powder molding pressing frame were changed, such as adding stiffeners on the both sides of the frame support shelf to improve the support plate bending rigidity and resistance to flex capacity. The results showed that the increasing thickness of the steel plate can reduce stress concentration. The overall deformation reduced from the original 0.361688mm to 0.254033mm. The maximum deformation area transferred from the support rack of the frame to the edge of mold shelf. The deformation of Y direction is reduced from 0.336271mm to 0.186853mm. The optimized deformation of the rack and the mold shelf significantly is reduced.

scholarly journals A New Method of Manufacturing Hollow Shafts via Flexible Skew Rolling

2021 ◽  
Vol 2101 (1) ◽  
pp. 012010
Author(s):  
Xiaoqing Cao ◽  
Baoyu Wang ◽  
Wei Guo ◽  
Zhidong Ju
Keyword(s):  
Rolling Force ◽  
Rolling Process ◽  
Fe Model ◽  
Forming Process ◽  
Hollow Shaft ◽  
Process Adjustment ◽  
Rolling Load ◽  
Rolling Torque ◽  
Skew Rolling ◽  
Hollow Shafts

Abstract The existing rolling process of large and long axle parts, such as the cross wedge rolling (CWR) process, requires special molds and larger equipment. Flexible skew rolling (FSR) hollow shafts with mandrel is a near net-shape rolling technology which can achieve the diversified production of rolled parts without special molds. It has significant advantages such as small equipment tonnage, small die size, low rolling load, simple process adjustment, and especially suitable for multi-variety and small-batch production. This paper proposes hollow train shafts formed by FSR with mandrel. Reasonable parameters were selected for experiments, and the forming process was calculated by finite element (FE) software. The experimental results are consistent with the simulation results, indicating that the FE model is reliable. The rolling force and rolling torque are analyzed by simulation. Finally, the microstructure of different positions of the rolled-piece is analyzed, and the microstructure of the rolled part is refined. It is provide a feasible scheme for the rolling of large hollow shaft parts.

Chatter in the Strip Rolling Process, Part 1: Dynamic Model of Rolling

1998 ◽  
Vol 120 (2) ◽  
pp. 330-336 ◽  
Author(s):  
I-S. Yun ◽  
W. R. D. Wilson ◽  
K. F. Ehmann
Keyword(s):  
Dynamic Model ◽  
Coulomb Friction ◽  
Rolling Force ◽  
Rolling Process ◽  
Rate Of Change ◽  
Two Dimensional ◽  
Entry And Exit ◽  
Strip Rolling ◽  
Coulomb Friction Law ◽  
Rolling Torque

This paper presents the development of a new dynamic model of the rolling process which provides estimates of the variations in exit gage, strip speed and tension at entry and exit, rolling force and rolling torque in response to variations in roll separation as well as the rate of change of the roll spacing. This two-dimensional dynamic model employs the Tresca friction factor approach instead of Amontons-Coulomb friction law.

Neural network modeling as an efficient approach to predict the density of ionic liquids/ethanol binary systems

2017 ◽  
Vol 16 (04) ◽  
pp. 1750031 ◽  
Author(s):  
Mostafa Lashkarbolooki
Keyword(s):  
Neural Network ◽  
Ionic Liquids ◽  
Binary Data ◽  
Binary Systems ◽  
Statistical Error ◽  
Percentage Error ◽  
Neural Network Modeling ◽  
Ann Model ◽  
Relative Deviation ◽  
Maximum Relative Deviation

Ionic liquids (ILs) especially their mixtures are of high interest within the different scientific societies due to their amazing properties. In this regard, a number of attempts have been made to measure, correlate, estimate and calculate the properties of ILs in the neat or mixture forms. Among the different possible predictive methods, artificial neural networks (ANNs) are widely used because of their unique and amazing capabilities for prediction of different parameters. With respect to this paper, a feed-forward ANN model is proposed to model the densities of different binary mixtures of ILs/ethanol. The proposed network is trained and tested with 1078 binary data points gathered by mining into the different published literatures. The data gathered from previously published literatures are separated into two different subsets namely training and testing. The statistical error analysis has shown that the proposed neural network correlated the binary densities with the overall mean absolute percentage error (MAPE), average relative deviation percentage error (ARD%), minimum relative deviation percent (RDmin%), maximum relative deviation Percent (RDmax%) and correlation coefficient ([Formula: see text] of 1.5%, [Formula: see text]0.1%, [Formula: see text]13.0%, 15.0% and 0.9712, respectively.

Finite Element Simulation of Bending Stress on Involute Spur Gear Tooth Profiles

2017 ◽  
Vol 30 ◽  
pp. 1-10
Author(s):  
Kolawole Adesola Oladejo ◽  
Dare Aderibigbe Adetan ◽  
Ayobami Samuel Ajayi ◽  
Oluwasanmi Oluwagbenga Aderinola
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Gear Tooth ◽  
Spur Gear ◽  
Bending Stress ◽  
Relative Deviation ◽  
Element Simulation ◽  
Maximum Relative Deviation ◽  
Bending Stresses ◽  
Good Agreement

This study investigated bending stress distribution on involute spur gear tooth profiles with pressure angle of 20 ̊ but different modules 2.5, 4.0 and 6.0 mm, using a finite-element-based simulation package - AutoFEA JL Analyzer. The drafting of the geometry for the three gear tooth profiles were implemented on the platform of VB-AutoCAD customized environment, before importing to the package. These were separately subjected to analysis for bending stresses for a point at the tooth fillet region with appropriate settings of material property, load and boundary conditions. With the same settings, the bending stresses were computed analytically using American Gear Manufacturers Association (AGMA) established equation. The results of the two approaches were in good agreement, with maximum relative deviation of 4.38%. This informed the confidence in the implementation of the package to investigate the variation of bending stress within the gear tooth profile. The simulation revealed decrease in the bending stresses at the investigated regions with increase in the module of the involute spur-gear. The study confirms that Finite element simulation of stresses on gear tooth can be obtained accurately and quickly with the AutoFEA JL Analyzer.

Research on Rolling Force Model Based on Distributed Cooperative Control System

2013 ◽  
Vol 299 ◽  
pp. 93-96
Author(s):  
Hong Jie Li ◽  
Qing Xue Huang ◽  
Chang Jiang Ju ◽  
Xiu Lian Gong ◽  
Jian Mei Wang
Keyword(s):  
Cooperative Control ◽  
Steel Plate ◽  
Rolling Force ◽  
Control Program ◽  
Control Architecture ◽  
Force Model ◽  
Reliable Operation ◽  
Automated Production ◽  
Layer Composite ◽  
Distributed Cooperative Control

Three-stand mills continues produced of multi-layer composite steel plate, multiple L2 servers together computing to complete the tasks, serviced to many models in whole automated production process. In this paper, multi-embedded systems distributed and cooperative control program takes instead of multi L2 server mode, one L2 data collection and record server was remained. An example of rolling force model is used to discuss the control architecture, Sims simplified formula. The experiment and numerical results show that the control architecture is capable of reliable operation, and the accuracy of the target is no less than 94%.

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