Effect of Idle Roll Bearing Friction on the Hot-Rolling Performance of Single-Roll Drive Mills

1967 ◽  
Vol 89 (3) ◽  
pp. 482-487 ◽  
Author(s):  
R. L. Holbrook ◽  
C. F. Zorowski
Keyword(s):  
Hot Rolling ◽  
Deformation Process ◽  
Iterative Procedure ◽  
Analytical Models ◽  
Drag Torque ◽  
Point Location ◽  
Rolling Parameter ◽  
Roll Bearing ◽  
Roll Drive ◽  
Bearing Friction

A study is made of the effects of idle roll drag torque on the hot-rolling performance of single-roll drive mills using two analytical models which consider the nonsymmetry of the deformation process. Predictions of roll load, torque, and exit stock curvature for a specified idle roll drag torque on a given mill setup are obtained by applying an iterative procedure of solution to a series of intermediate rolling parameter results presented in terms of the idle roll neutral point location and strip reduction. In general, it is found that the drag torque increases the stock curvature significantly, is essentially additive to the required drive torque, and decreases the roll load only slightly.

Numerical Modelling and Simulation of the Hot Rolling Mill Process

2016 ◽  
Vol 15 ◽  
pp. 64-74
Author(s):  
Filippo Cianetti ◽  
Claudio Braccesi ◽  
Maria Cristina Valigi
Keyword(s):  
Hot Rolling ◽  
Rolling Mill ◽  
Deformation Process ◽  
Rolling Force ◽  
True Strain ◽  
Element Model ◽  
304 Stainless Steel ◽  
Isotropic Hardening ◽  
Main Process ◽  
Hot Rolling Mill

In the design of the rolling mill plants, it is fundamental to study the behaviour of the deformation process to assess the main process variables (such as torque and rolling force) in all operating conditions.In this paper, a finite element model is developed and the numerical simulations of the plastic deformation process, in the hot rolling mill of AISI 304 stainless steel, are shown. In the proposed model a Multilinear Isotropic Hardening behaviour of material has been assumed and true stress-true strain curves have been found, taking into account temperature and strain rate. Numerical results are compared with experimental measures regarding an existing hot rolling mill plant.

Microstructure Modeling of the Ribbed Steel Bar Hot Rolling of V-Microalloyed Steel

2010 ◽  
Vol 168-170 ◽  
pp. 599-602
Author(s):  
Lei Yang ◽  
Yi Zhu He ◽  
Xiao Min Yuan
Keyword(s):  
Grain Size ◽  
Hot Rolling ◽  
Integrated Model ◽  
Analytical Models ◽  
Austenite Grain Size ◽  
Microstructure Modeling ◽  
Austenite Grain ◽  
Steel Bar ◽  
Rod Rolling ◽  
Strain Model

This paper proposes an integrated model for the prediction of the pass-by-pass evolution of the austenite grain size of the ribbed steel bar hot rolling. The integrated model consists of a strain model, a temperature model, a microstructure evolution model of austenite grain size and a flow stress model. Hot rod rolling experiments are conducted to examine the proposed analytical models. The integrated model is employed to examine the effects of modifications of the refined austenite grain size of the 500MPa ribbed steel bar. Refinement of ferrite could be realized by refining the austenite grain size at the final pass.

Calculating the Torques and Meter Factor of Turbine Flow Meter with Numerical Simulation

2015 ◽  
Vol 713-715 ◽  
pp. 164-168
Author(s):  
Yong Zhang Huang ◽  
Ying Tao Sun ◽  
Bao Sheng Zhang ◽  
Gang Chen ◽  
Bao Li Zhu
Keyword(s):  
Numerical Simulation ◽  
Viscous Drag ◽  
Drag Torque ◽  
Friction Drag ◽  
Flow Meter ◽  
Numerical Simulation Methods ◽  
Unsteady Numerical Simulation ◽  
Driving Torque ◽  
Turbine Flow Meter ◽  
Bearing Friction

The torque balancing equations and the torque equation of the turbine flow meter is deduced in the paper. The driving torque, the viscous drag torque and the bearing friction drag torque on the impeller is calculated by unsteady numerical simulation methods. The change rule of the various torques is gotten considering or not the influence of bearing drag torque. Also, the effect of different viscosity on the torque is calculated, which is used to explain the phenomenon of meter factor change law with the viscosity. It makes clear that the possibilities to improve the accuracy of the meter and to predicate the meter factor by unsteady numerical simulation.

Improved Analytical and Semi-Analytical Durability Models (Constrained Models) for Various Surface-Mount Configurations

2002 ◽  
Author(s):  
Pradeep Sharma ◽  
James Loman
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Solder Joint ◽  
Thermal Cycling ◽  
Deformation Process ◽  
Analytical Models ◽  
Surface Mount ◽  
Constrained Models ◽  
Constraint Approach ◽  
Finite Element Calibration

Several analytical and semi-analytical models to predict solder joint durability under thermal cycling loadings have been proposed. In general, these models are overtly conservative often requiring extensive experimental and/or finite element calibration. We present, based on the physics of the deformation process, a direct approach to improve these classes of model by resolving one of the major causes of conservatism. Our contribution is applicable to virtually all known surface mount configurations. The improved models (henceforth termed as constraint models) retain the simplicity of use of the existing ones. The efficacy of constraint approach is demonstrated on leadless resistors and comparisons are made with existing models and experimental data.

Mechanism of irregular crack-propagation in thermal controlled fracture of ceramics induced by microwave

2020 ◽  
Vol 21 (6) ◽  
pp. 610
Author(s):  
Xiaoliang Cheng ◽  
Chunyang Zhao ◽  
Hailong Wang ◽  
Yang Wang ◽  
Zhenlong Wang
Keyword(s):  
Crack Propagation ◽  
Industrial Application ◽  
Ceramic Materials ◽  
Advanced Technology ◽  
Analytical Models ◽  
Propagation Mechanism ◽  
Unstable Crack ◽  
Fracture Simulation ◽  
Initial Stage ◽  
Controlled Fracture

Microwave cutting glass and ceramics based on thermal controlled fracture method has gained much attention recently for its advantages in lower energy-consumption and higher efficiency than conventional processing method. However, the irregular crack-propagation is problematic in this procedure, which hinders the industrial application of this advanced technology. In this study, the irregular crack-propagation is summarized as the unstable propagation in the initial stage, the deviated propagation in the middle stage, and the non-penetrating propagation in the end segment based on experimental work. Method for predicting the unstable propagation in the initial stage has been developed by combining analytical models with thermal-fracture simulation. Experimental results show good agreement with the prediction results, and the relative deviation between them can be <5% in cutting of some ceramics. The mechanism of deviated propagation and the non-penetrating propagation have been revealed by simulation and theoretical analysis. Since this study provides effective methods to predict unstable crack-propagation in the initial stage and understand the irregular propagation mechanism in the whole crack-propagation stage in microwave cutting ceramics, it is of great significance to the industrial application of thermal controlled fracture method for cutting ceramic materials using microwave.

Analysis of interconnections between technical systems on hierarchically connected technological levels of steel sheet production by hot rolling

2020 ◽  
Vol 76 (8) ◽  
pp. 847-855
Author(s):  
E. N. Shiryaeva ◽  
M. A. Polyakov ◽  
D. V. Terent'ev
Keyword(s):  
Hot Rolling ◽  
Systems Analysis ◽  
Rolling Mill ◽  
Steel Sheet ◽  
Technological System ◽  
Necessary Condition ◽  
Rolled Sheet ◽  
Technological Systems ◽  
Hot Rolling Mill ◽  
Technical Systems

Complexity of modern metallurgical plants, presence of great number of horizontal and vertical interactions between their various structural subdivisions makes it necessary to apply a systems analysis to elaborate effective measures for stable development of a plant operation. Among such measures, digitalization of a plant is widespread at present. To implement the digitalization it is necessary to have clear vision about links at all the levels of the technological system of a plant. A terminology quoted, accepted in the existing regulatory documents for defining of conceptions, comprising the technological system. It was shown, that the following four hierarchical levels of technological systems are distinguished: technological systems of operations, technological systems of processes, technological systems of production subdivisions and technological systems of plants. A hierarchical scheme of technological systems of hot-rolled sheet production at an integrated steel plant presented. Existing horizontal and vertical links between the basic plant’s shops shown. Peculiarities of flows of material, energy and information at the operation “rolling” of the technological system “hot rolling of a steel sheet” considered. As a technical system of the technological process of the hot rolling, the hot rolling mill was chosen. A structural diagram of the hot rolling mill was elaborated, the mill being consisted of reheating furnaces, roughing and finishing stand groups, with an intermediate roll-table between them, and down-coilers section. Since the rolling stands are the basic structural elements of the hot rolling mill, structural diagrams of a roughing and a finishing stands were elaborated. Results of the systems analysis of the technological and technical systems, hierarchically linked in the process of steel sheet hot rolling, can be applied for perfection of organization structure of the whole plant, as well as for elaboration mathematical models of a system separate elements functioning, which is a necessary condition for a plant digitalization.

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