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.

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.

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.

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 A robust 3D finite element model for concrete columns confined by FRCM system

2019 ◽  
Vol 281 ◽  
pp. 01006 ◽  
Author(s):  
Majid M.A. Kadhim ◽  
Mohammed J Altaee ◽  
Ali Hadi Adheem ◽  
Akram R. Jawdhari
Keyword(s):  
Finite Element ◽  
Cement Mortar ◽  
Three Dimensional ◽  
Concrete Columns ◽  
Element Model ◽  
Fe Model ◽  
3D Finite Element ◽  
Composite Failure ◽  
Global Buckling ◽  
Fibre Reinforced Polymer

Fibre reinforced cementitious matric (FRCM) is a recent application of fibre reinforced polymer (FRP) reinforcement, developed to overcome several limitations associated with the use of organic adhesive [e.g. epoxies] in FRPs. It consists of two dimensional FRP mesh saturated with a cement mortar, which is inorganic in nature and compatible with concrete and masonry substrates. In this study, a robust three-dimensional (3D) finite element (FE) model has been developed to study the behaviour of slender reinforced concrete columns confined by FRCM jackets, and loaded concentrically and eccentrically. The model accounts for material nonlinearities in column core and cement mortar, composite failure of FRP mesh, and global buckling. The model response was validated against several laboratory tests from literature, comparing the ultimate load, load-lateral deflection and failure mode. Maximum divergence between numerical and experimental results was 12%. Following the validation, the model will be used later in a comprehensive parametric analysis to gain a profound knowledge of the strengthening system, and examine the effects of several factors expected to influence the behaviour of confined member.

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.

Application of the Finite Element Technique in the Design and Evaluation of the Artificial Facets for the Lumbar Spine

2006 ◽  
Vol 1 (2) ◽  
pp. 176-179
Author(s):  
Miranda N. Shaw ◽  
Vijay K. Goel ◽  
Koichi Sairyo ◽  
Jayant Jangra ◽  
Ashok Biyani ◽  
...  
Keyword(s):  
Finite Element ◽  
Pedicle Screw ◽  
Three Dimensional ◽  
Fe Model ◽  
3D Finite Element ◽  
Experimental Protocols ◽  
Loading Modes ◽  
Element Technique ◽  
Without Screws ◽  
Spine Segment

An experimentally validated three-dimensional (3D) finite element (FE) model of the ligamentous L3–S1 segment was used to study the effects of artificial facet designs on the segment biomechanics (motion, facet loads, and stresses). The intact model was modified to simulate several artificial facet designs across the L4–L5 segment including capping with and without screws and pedicle screw based designs with sliding articulating surfaces. For the pedicle screw based design, the effect of increasing the connecting shaft thickness and increasing width surrounding the pedicle screw, butted against the vertebral pedicle for further support, was studied. All of the FE models were evaluated in response to 6 Nm moment in extension, flexion, bending, and rotation. The predicted increases in motion, compared to the intact case, were smaller. The predicted facet loads decreased up to 25.7% in extension and 25.1% in bending at the implanted level as compared to intact spine segment. For all of the loading modes, the stresses in both implant designs were less than the yield stress of titanium. Therefore, the implants are unlikely to fail. Additional cadaver and other experimental protocols are essential for the evaluations of the most appropriate designs identified through the FE investigations.

The Effect of the Initial Temperature of Ring Blank on Conical Ring Rolling Process

2014 ◽  
Vol 597 ◽  
pp. 266-271
Author(s):  
Wen Meng ◽  
Guo Qun Zhao ◽  
Yan Jin Guan
Keyword(s):  
Temperature Distribution ◽  
Initial Temperature ◽  
Rolling Force ◽  
Rolling Process ◽  
Ring Rolling ◽  
Fe Model ◽  
Rolling Moment ◽  
Rolled Ring ◽  
Ring Rolling Process ◽  
Ring Blank

A FE model of radial conical ring rolling process with a closed die structure on the top and bottom part of driven roll (RCRRCDS) process was set up based on ABAQUS/Explicit software. The effect of the initial temperature of conical ring blank on equivalent plastic strain (PEEQ) and temperature distribution of rolled ring, average rolling force and average rolling moment was investigated. The results indicated that with the increase of the initial temperature of ring blank, the PEEQ distribution of rolled ring becomes uniform at first and then less uniform; the temperature distribution gradually becomes homogeneous; and both average rolling force and average rolling moment decrease. When the initial temperature of ring blank is 925°C, the PEEQ distribution of rolled ring is most uniform; the temperature distribution of rolled ring is relatively uniform; the average rolling force and average rolling moment are relatively smaller.

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.

Simulation of Cold Ring Rolling Based on Rate Dependent Crystal Plasticity

2007 ◽  
Vol 561-565 ◽  
pp. 1813-1817
Author(s):  
Hong Wei Li ◽  
He Yang ◽  
Zhi Chao Sun ◽  
M. Wang ◽  
Lan Yun Li
Keyword(s):  
Crystal Plasticity ◽  
Rolling Force ◽  
Rate Sensitivity ◽  
Sensitivity Coefficient ◽  
Ring Rolling ◽  
Fe Model ◽  
Forming Process ◽  
Rate Dependent ◽  
Cold Ring Rolling ◽  
Material Behaviors

Material behaviors of anisotropy and rate sensitivity affect cold ring rolling greatly. So, a self-developed incremental model of rate dependent crystal plasticity (RDCP) is utilized to forecast the deformation characteristics of this forming process based on a 3D FE model under ABAQUS/Explicit environment. The results show that the model of RDCP captures material behaviors of anisotropy and rate sensitivity better in this forming process by the comparison with the model of J2 plasticity; with the decrease of rate sensitivity coefficient, the forming process becomes more unstable with smaller rolling force and growth in ring radial direction; with the increase of feed rate of idle roll, the deformation of ring becomes more even while the rolling force becomes larger.

Numerical Analysis of Force and Power Parameters in Cold Ring Rolling

2007 ◽  
Vol 561-565 ◽  
pp. 805-808 ◽  
Author(s):  
L.G. Guo ◽  
He Yang
Keyword(s):  
Numerical Analysis ◽  
Three Dimensional ◽  
Rolling Process ◽  
Ring Rolling ◽  
Fe Model ◽  
Roll Force ◽  
Rolling Mills ◽  
Roll Moment ◽  
Cold Ring Rolling ◽  
Ring Rolling Process

During cold ring rolling process, the accurate prediction and analysis of force and power parameters, including roll force (RF) and roll moment (RM), is important in selecting, designing and developing the forming rolls and cold ring rolling mills. In this paper, a three-dimensional elastic-plastic dynamic explicit FE model of cold ring rolling process has been presented and validated in terms of roll force and geometry development. Based on the model, the variation laws of force and power parameters under different sizes of forming rolls (including driver roll and idle roll) and forming parameters (including the rotational speed of driver roll 1 n and the feed rate of idle roll v ) have been revealed by comprehensive numerical simulations.

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