The Development of Short Stress Path Experimental Asymmetric Multifunctional Rolling Mill

2010 ◽  
Vol 145 ◽  
pp. 171-176
Author(s):  
Ze Jun Chen ◽  
Guang Jie Huang ◽  
Jian Jun Min ◽  
Boa Hua Qian
Keyword(s):  
Principal Components ◽  
Rolling Mill ◽  
Stress Path ◽  
Nonferrous Metals ◽  
Asymmetric Rolling ◽  
Roll Speed ◽  
Teaching And Research ◽  
Design And Manufacture ◽  
Design Ideas ◽  
Conventional Rolling

This paper describes the development and design of a novel short stress path rolling mill which is used for teaching and research. The rolling mill can implement the asymmetric rolling by the way of the adjustment of upper roll speed, and also working as conventional rolling when the roll speeds of two rolls are equal. The rolling mill can produce not only the plate and sheet, but also profiles by the roll of different grooves. The rolling mill is appropriate for the rolling of the steels and nonferrous metals. In this paper, the design ideas and main parameters of principal components are presented with respect to the new rolling mill. It can provide references for the design and manufacture of rolling mill of similar functions and structures.

scholarly journals Tailoring One-Pass Asymmetric Rolling of Extra Low Carbon Steel for Shear Texture and Recrystallization

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1935 ◽  
Author(s):  
Satyaveer Singh Dhinwal ◽  
Laszlo S. Toth ◽  
Rimma Lapovok ◽  
Peter Damian Hodgson
Keyword(s):  
Tensile Strength ◽  
Carbon Steel ◽  
Strain Rate ◽  
Low Carbon Steel ◽  
Thickness Reduction ◽  
Low Carbon ◽  
Asymmetric Rolling ◽  
Shear Texture ◽  
Grain Fragmentation ◽  
Conventional Rolling

Systematic single pass rolling experiments were carried out at room temperature on extra low carbon steel by varying the roll diameter ratio between 1:1 to 1:2 and thickness reduction per pass in the range of 20–75%. The aim of this study was to define the conditions under which the rolling texture can transit into a shear texture. The consequences for grain fragmentation, tensile strength, recrystallization texture, and grain growth kinetics were also studied. It was found that in a certain range of thickness reduction per pass and asymmetric ratio, an effective rotation towards the shear texture takes place in conventional rolling. The value of the shear coefficient factor (shear strain rate/rolling strain rate) in asymmetric rolling depends on the selection of thickness reduction per pass. The measured value of shear coefficient was found to be independent of the number of passes used in asymmetric rolling. The consequence of arising shear textures is an acceleration of grain fragmentation. After rapid heat treatment, both tensile strength and recrystallization kinetics of asymmetric rolled sheets showed merits over the conventional rolling. Only the evolved Goss orientation from asymmetric conditions of deformation shows higher stability than any other preferred shear texture components after complete recrystallization.

The Collaborative Design and Manufacture of Injection Molds Based on the CSCW

2009 ◽  
Vol 16-19 ◽  
pp. 199-202 ◽  
Author(s):  
Zheng Hao Ge ◽  
Qing Kai Yuan ◽  
Meng Jiang ◽  
Xiao Yun Tang
Keyword(s):  
Life Cycle ◽  
Work Environment ◽  
Collaborative Design ◽  
Cooperative Work ◽  
Development Cost ◽  
Organizational Model ◽  
Design And Manufacture ◽  
Design Ideas ◽  
Mold Quality

Cooperative work environment supported by computer (CSCW) is a platform for sharing information, which supports the exchange of design ideas of different teams. The collaborative design and manufacture of injection molds based on the CSCW can shorten the life cycle of mold development, improve the mold quality and lower the development cost. This paper describes the framework of collaborative design and manufacture for injection molds, discusses the construction of the organizational model and analyzes the workflow of design and manufacture.

A comparison of continuous SPD processes for improving the mechanical properties of aluminum alloy 6111

2009 ◽  
Vol 24 (2) ◽  
pp. 459-469 ◽  
Author(s):  
R. Lapovok ◽  
L.S. Tóth ◽  
M. Winkler ◽  
S.L. Semiatin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Velocity ◽  
Asymmetric Rolling ◽  
Shear Texture ◽  
Angular Pressing ◽  
Grain Structures ◽  
Billet Material ◽  
Conventional Rolling ◽  
Aluminum Alloy 6111

Microstructure evolution, mechanical properties, formability, and texture development were determined for AA6111 samples processed by asymmetric rolling (ASR) with different roll friction, velocity, or diameters, conventional rolling (CR), and equal-channel-angular pressing (ECAP). Highly elongated or sheared grain structures were developed during ASR/CR and ECAP, respectively. ASR led to improved r-values and formability compared with CR primarily as a result of the development of moderate shear-texture components analogous to those developed during ECAP of billet material. ASR based on different roll diameters gave the best combination of strength, ductility, and formability.

Finite Element Analysis of the Roller Bearing Used in Rolling Mill

2013 ◽  
Vol 367 ◽  
pp. 141-144
Author(s):  
Yan Gang Wei ◽  
Yan Kui Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Rolling Mill ◽  
Maximum Stress ◽  
Roller Bearing ◽  
Element Analysis ◽  
Roller Bearings ◽  
Conventional Condition ◽  
Design And Manufacture

The loading roller number and maximum stress of the bearings can not be calculated accurately through conventional methods because support manner of the roller bearings used in rolling mill is different from that of the roller bearings used in conventional condition. Based on characteristic of the bearings, the model of the bearing is made combining contact mechanics with finite element method. The loading roller number and maximum stress of the bearings are calculated through FEA. The work of this paper offers a reference to design and manufacture this kind of bearings.

Microstructures and Mechanical Properties of Nano-Structured Aluminum Fabricated by Accumulative Roll-Bonding Using Different Rolling Methods

2006 ◽  
Vol 317-318 ◽  
pp. 327-330 ◽  
Author(s):  
Seong Hee Lee ◽  
Tetsuo Sakai ◽  
Chung Hyo Lee ◽  
Yong Ho Choa
Keyword(s):  
Mechanical Properties ◽  
Accumulative Roll Bonding ◽  
The Other ◽  
Speed Ratio ◽  
Roll Speed ◽  
Roll Bonding ◽  
Differential Speed Rolling ◽  
Processed Sample ◽  
Conventional Rolling ◽  
Differential Speed

Nano-structured aluminum was fabricated by accumulative roll-bonding (ARB) process using different rolling methods. One is the ARB using conventional rolling (CR) in which the speed of two rolls (3.0m/min) was equal to each other. The other is the ARB using differential speed rolling (DSR) in which the speed of two rolls is different to each other. The roll peripheral speed of one roll was 2.0m/min and that of another roll was 3.6m/min. The roll speed ratio was kept at 1.8. The ARB was conducted up to 6 cycles at ambient temperature without lubrication. In both cases, the ultrafine grains were developed in the samples. The grains formed by the DSR-ARB were more equiaxed and finer than those produced by the CR-ARB. Tensile strength of the DSR-ARB processed sample was superior to that of the CR-ARB processed one. The elongation was not affected significantly by the number of ARB cycles in both cases. Texture analysis demonstrated that the shear strain, in the case of DSR-ARB, was introduced into the center of thickness. It was concluded that the DSR-ARB process was more effective for grain refinement and strengthening than the CR-ARB process.

EVOLUTION OF STRAIN STATES AND TEXTURES IN AA 5052 SHEET DURING CROSS-ROLL ROLLING

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6106-6111 ◽  
Author(s):  
S.H. KIM ◽  
D.G. KIM ◽  
H.G. KANG ◽  
M.Y. HUH ◽  
J.S. LEE ◽  
...  
Keyword(s):  
Rolling Mill ◽  
Three Dimensional ◽  
Fem Simulation ◽  
Deformation Texture ◽  
Rolled Sample ◽  
Complex Shear ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Roll Gap ◽  
Conventional Rolling

Cross-roll rolling of AA 5052 sheets was carried out using a rolling mill in which the roll axes are tilted by ±7.5° away from the transverse direction of the rolled sample. Besides cross-roll rolling, normal-rolling using a conventional rolling mill was also carried out with the same rolling schedule for clarifying the effect of cross-roll rolling. The evolution of strain states during cross-roll rolling was investigated by texture measurements and by three-dimensional finite element method (FEM) simulation. Cross-roll rolling gives rise to the operation of all three shear components ε 12, ε 13 and ε 23 in the roll gap. This complex shear states during cross-roll rolling strongly reduce the intensities of the deformation texture components.

scholarly journals Regulating the Coordinates of the Electromechanical System of the Rolling Mill Based on the Elastic Torque Observer

2021 ◽  
Vol 21 (2) ◽  
pp. 115-129
Keyword(s):  
Automatic Control ◽  
Control Systems ◽  
Electric Drive ◽  
Rolling Mill ◽  
Experimental Studies ◽  
Speed Control ◽  
Electromechanical System ◽  
Transient Processes ◽  
Roll Speed ◽  
Elastic Shaft

The paper considers the electromechanical system of the reversing stand of the plate rolling mill 5000 of PJSC “Magnitogorsk Metallurgical Plant” (PJSC “MMK”). The performed experimental studies of transient processes in the mode of gripping metal by rolls allowed establishing unacceptable dynamic loads of an oscillatory nature and a loss of controllability of the electric drive. This confirms the need for the development of control methods that limit the motor and spindle torques. It is noted that the known control systems for the speed modes of an electric drive, which decrease the elastic moment due to the preliminary closing of the angular gaps, are, in essence, open-loop speed control systems. This does not provide for the controlled regulation of coordinates in dynamic modes. The paper proposes the development of a closed system for automatic control of coordinates of a two-mass electromechanical system with an observer of the moment of the elastic shaft and the speed of the second mass. An observer of the unmeasurable parameters of a two-mass rolling mill system has been developed. It provides an indirect determination (recovery) of the roll speed and the spindle torque in on-line mode. It is based on a system of equations in the state space. By comparing the reconstructed and experimentally obtained transient processes, the satisfactory accuracy of the results has been confirmed. Based on the proposed observer, the authors developed an automatic control system (ACS) of the roll speed with subordinate contours of the elastic shaft moment, speed and engine torque. The setting of closed-loop regulators has been substantiated. Transient processes of moments and velocities are considered at impact application of a load with increased speed of the second mass speed control loop. The analysis of the LAFC and LPFC confirmed the stability of the developed system in the frequency range. The analysis of experimental data substantiated a conclusion about the influence of the angular gap on the accuracy of the elastic moment recovery in the mode of metal capture by rolls. Prospects for the introduction of developments at mill 5000 and other rolling mills operating with shock load are noted.

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