FE Analysis of Spread in Hot Rolling of Large Rings with Different Sizes

2012 ◽  
Vol 433-440 ◽  
pp. 558-562
Author(s):  
Min Wang
Keyword(s):  
Hot Rolling ◽  
Fe Simulation ◽  
Three Dimensional ◽  
Middle Layer ◽  
Ring Rolling ◽  
Relative Reduction ◽  
Fe Model ◽  
Large Rings ◽  
The Relationship

How to effectively reduce spread is an important subject in the area of ring rolling. In the paper, a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for hot rolling of large rings is developed. The relationship between spread and the equivalent shape parameters of the deformation zone is discussed. Variations of spread with relative reduction Rr during hot rolling of titanium alloy large rings with different sizes are analyzed and compared using FE simulation. The main results reveal that (1) the spread in a ring exhibits an axisymmetric distribution after the first revolution of the ring. (2) the peak spread appears in the inside or outside layer of a ring, and the minimum spread is found in the middle layer. (2) as Rr increases, the spread increases and the end-plane quality of the ring reduces.

Rolling Force in Hot Rolling of Large Rings

2011 ◽  
Vol 314-316 ◽  
pp. 539-542
Author(s):  
Min Wang ◽  
Chun Zhang
Keyword(s):  
Hot Rolling ◽  
Rolling Force ◽  
Three Dimensional ◽  
Processing Parameters ◽  
Ring Rolling ◽  
Relative Reduction ◽  
Fe Model ◽  
Large Rings ◽  
Average Shape

For hot rolling of large rings, determination of rolling force plays an important role in designing, choosing and optimizing of processing plan and rolling mill. The average shape parameter of the deformation zone of ring rolling is presented, and a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for the process is developed. The effects of processing parameters on rolling force during hot rolling of titanium alloy large rings with different sizes are explored and the results obtained show that different rings follow a similar trend: increasing the relative reduction or rotational speed of the driver roll, or decreasing the feed rate of the idle roll is beneficial to a reduction in rolling force.

Friction Effect in Hot Rolling of Large Rings with Different Sizes

2011 ◽  
Vol 213 ◽  
pp. 487-491
Author(s):  
Min Wang
Keyword(s):  
Friction Coefficient ◽  
Hot Rolling ◽  
Rolling Force ◽  
Three Dimensional ◽  
Axial Direction ◽  
Fe Model ◽  
Rolling Moment ◽  
Large Rings ◽  
Forming Condition

For hot rolling of large rings, the friction between a ring and rolls plays an important role in maintaining the stable forming of the process and quality of ring parts. The reasonable range of friction coefficient is determined analytically based on the stable forming condition, and a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for the process is developed. The effect of friction on hot rolling of titanium alloy large rings with different sizes are explored, and the results obtained show that as friction coefficient increases, different rings have similar variation law: less metal flows to the axial direction of a ring and the spread distribution at the end plane of a ring becomes more uniform; the strain and temperature distributions tend to be less uniform; rolling force and rolling moment have little change.

Blank Thickness Effects on Rolling Force in Hot Rolling of Titanium Alloy Large Rings

2011 ◽  
Vol 189-193 ◽  
pp. 2651-2654
Author(s):  
Min Wang
Keyword(s):  
Titanium Alloy ◽  
Hot Rolling ◽  
Rolling Force ◽  
Three Dimensional ◽  
Outer Radius ◽  
Ring Rolling ◽  
Fe Model ◽  
Large Rings ◽  
Inner Radius ◽  
Predominant Effect

For hot rolling of titanium alloy large rings, rolling force is very important for designing, choosing and optimizing of processing plan and rolling mill. In the paper, the average shape parameter of the deformation zone of ring rolling is presented first, and then a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for the process is developed. Finally, influences of the blank outer radius R0 and inner radius r0 on rolling force are discussed and compared for exploring blank thickness effects. The main results show that decreasing the blank thickness by decreasing R0 or increasing r0 leads to a saving of rolling force, while R0 has a predominant effect than r0.

Axial Spread Evolution during Hot Rolling of Large Rings with Different Sizes

2011 ◽  
Vol 189-193 ◽  
pp. 2092-2095
Author(s):  
Min Wang
Keyword(s):  
Finite Element ◽  
Titanium Alloy ◽  
Hot Rolling ◽  
Outer Layer ◽  
Three Dimensional ◽  
Ring Rolling ◽  
Fe Model ◽  
3D Finite Element ◽  
Equivalent Ratio ◽  
Large Rings

For ring rolling without axial rolls, how to effectively suppress axial spread has become an important subject. In the paper, a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for hot rolling of large rings is developed. Spread evolution of titanium alloy large rings with different sizes are explored and compared based the developed model. The main results show that (1) the spread in a ring takes on an axisymmetric distribution after the first revolution of the ring. (2) with the equivalent ratio of feed amount per revolution decreasing, the peak spread transfers from the outer layer to the inner layer for rings with different sizes.

scholarly journals The three-dimensional lattice as an architectural space

2018 ◽  
Vol 212 ◽  
pp. 04005
Author(s):  
Andrey Bolshakov
Keyword(s):  
Three Dimensional ◽  
Human Movement ◽  
Theoretical Understanding ◽  
Architectural Space ◽  
Spatial Lattice ◽  
Spatial Grids ◽  
Relationship Of ◽  
The Relationship ◽  
Main Material

Space is the main material with which the architect works. The space organized by the means of architecture is an art environment for the life of society. With many aspects of the organization of space, which are studied in the literature, the problem of their assembly and integration remains unsolved. The paper proposes a method of assembling spatial representations in architecture-the correlation of the spatial lattice and the factors of its form-formation, considered in the system, i.e. together. The approach is that in a broad overview of the world architecture, both in its theory and in practice, from historical to modern, examples of modification of spatial grids under the influence of one or a group of dominant factors are revealed. As a result, provisions on the relationship of the geometry of spatial grids with the following factors have been revealed: publicity and privacy; architectonics, the influence of the lattice on the differentiation of the streams of human movement; the architecture’s ability to carry a message; navigation properties, evaluation of connectivity and centrality of places in the spatial lattice; evaluation of the quality of the composition through the identification of ways of order and randomness in the elements of the spatial lattice. The results of the work can be used both for theoretical understanding of the architectural space in the study and design of architecture, and in architectural education.

Influences of Geometric Factors on Rolling Force and Moment in Hot Ring Rolling of Large Parts

2012 ◽  
Vol 433-440 ◽  
pp. 563-566 ◽  
Author(s):  
Min Wang
Keyword(s):  
Titanium Alloy ◽  
Shape Parameter ◽  
Rolling Force ◽  
Three Dimensional ◽  
Ring Rolling ◽  
Fe Model ◽  
Average Radius ◽  
3D Finite Element ◽  
Geometric Factors ◽  
Average Shape

For hot ring rolling of large parts, rolling force and moment are of significance for designing, choosing and optimizing of rolling die and mill. In the study, the average shape parameter of the deformation zone of ring rolling is presented first, and then a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for the process is developed. Finally, the influences of geometric factors on rolling force and moment during hot ring rolling of titanium alloy large parts are explored. The main results show that increasing the ratio of driver roll radius to idle roll radius or decreasing the average radius of blank is beneficial to a saving of rolling force and moment, while the axial height of blank has a little influence.

Effects of Rotational Speed of Driver Roll on Hot Ring Rolling of 6061 Aluminum Alloy by 3D FE Simulation

2013 ◽  
Vol 773 ◽  
pp. 309-315 ◽  
Author(s):  
Lian Jie Li ◽  
Xiao Dong Luo ◽  
Yong Xiang Zhu
Keyword(s):  
Aluminum Alloy ◽  
Rotational Speed ◽  
Rolling Process ◽  
Ring Rolling ◽  
Fe Model ◽  
6061 Aluminum Alloy ◽  
Hot Rolling Process ◽  
Rolled Ring ◽  
Force Contact

In this paper, a 3D elastic-plastic and coupled thermo-mechanical FE model of radial ring rolling of 6061 aluminum alloy is developed, and the hot rolling process with different the rotational speed of driver roll n is simulated by using the dynamic explicit code ABAQUS/Explicit. The influence laws of the rotational speed of driver roll on the uniformity of strain and temperature distribution (STD), fishtail coefficient, roll force, contact area and roll moment are revealed respectively. One optimum n is obtained, under which SDT is relatively uniform; meanwhile, another optimum n is obtained, under which the quality of end-plane of the rolled ring is the best. The result can provide a valuable guideline to research and optimum of the hot ring rolling of aluminum alloys.

scholarly journals Study on the Deformation of Pavement Structure with Multiplex Organic Hydraulicity Mixture under Driving Load Based on Simulation and Experiment

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hairong Gu ◽  
Lingying Zhao ◽  
Min Ye ◽  
Zhiyong Li ◽  
Xinxin Xu ◽  
...  
Keyword(s):  
Global Warming ◽  
Current Literature ◽  
Middle Layer ◽  
Contribution Rate ◽  
Continuous Growth ◽  
Road Surfaces ◽  
Simulation And Experiment ◽  
New Type ◽  
The Relationship

With the continuous growth of global warming and traffic volume, rutting deformation is common on road surfaces. A new type of pavement mixture, a semiflexible mixture, was proposed to solve the easy deformation and low riding quality of traditional pavement mixtures. It can be divided into pouring type and mixing type according to the construction method. However, there is little research on mixed semiflexible mixtures (i.e., multiplex organic hydraulicity (MOH) mixtures) in the current literature, so the deformation of pavement under driving loads was studied based on the MOH mixture in this paper. Four types of pavement composed of the traditional mixture and MOH mixture (i.e., AC13-AC20, AC13-MOH, MOH-MOH, and MOH-AC20) were selected to achieve the purpose of the research. Based on these four types of pavement, the deformation of the pavement was studied by simulations and experiments. The results show that the deformation of the upper layer is almost the same for these four types of pavement and that the deformation of the middle layer changes substantially for these four types of pavement. In regard to the deformation, the relationship is MOH-MOH < AC13-MOH < MOH-AC20 < AC13-AC20. In addition, the contribution rate of the deformation of the middle layer is much greater than that of the upper layer. The antideforming ability of the whole pavement can be improved by using the MOH mixture as the middle layer of the pavement, which means that the performance of the MOH mixture can achieve the best performance when it is applied to the middle layer.

scholarly journals Wavelength-Selective Phase-Shifting Digital Holography: Color Three-Dimensional Imaging Ability in Relation to Bit Depth of Wavelength-Multiplexed Holograms

2018 ◽  
Vol 8 (12) ◽  
pp. 2410 ◽  
Author(s):  
Tatsuki Tahara ◽  
Reo Otani ◽  
Yasuhiro Takaki
Keyword(s):  
Digital Holography ◽  
3D Imaging ◽  
Dynamic Range ◽  
Three Dimensional ◽  
Image Sensor ◽  
Phase Shifting ◽  
3D Images ◽  
Wavelength Resolution ◽  
The Relationship

The quality of reconstructed images in relation to the bit depth of holograms formed by wavelength-selective phase-shifting digital holography was investigated. Wavelength-selective phase-shifting digital holography is a technique to obtain multiwavelength three-dimensional (3D) images with a full space-bandwidth product of an image sensor from wavelength-multiplexed phase-shifted holograms and has been proposed since 2013. The bit resolution required to obtain a multiwavelength holographic image was quantitatively and experimentally evaluated, and the relationship between wavelength resolution and dynamic range of an image sensor was numerically simulated. The results indicate that two-bit resolution per wavelength is required to conduct color 3D imaging.

Effect of Instructions on a Creative Task: Discipline and Form in Hand Sculptures

1966 ◽  
Vol 22 (3) ◽  
pp. 943-950 ◽  
Author(s):  
Leonard M. Lansky ◽  
John M. Peterson
Keyword(s):  
Three Dimensional ◽  
Stimulus Complexity ◽  
Creative Task ◽  
Wooden Cube ◽  
The Relationship ◽  
New Look

How do different limitations which are imposed on a person affect the quality of his creative product? Different freshman sections in architecture were randomly given different limitations for their first three-dimensional assignment which was to produce a handcarving from a 6-in. wooden cube. The limitations were in the number of edges to be left intact: 0, 3, 6, 9, and 12. As predicted, the products differed in relation to the limitations; however, more specific predictions about which carvings would excel were only partially confirmed because, it is speculated, the staff had focused more on the students' frustrations than on some inherent properties of the task. The data do fit an interpretation which relates the architectural concepts of object, void, and their relationships to the “new look” in motivation wherein focus is on the relationship between stimulus complexity and the person's needs and abilities.

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