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.

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.

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.

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.

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.

Stress State and Deformation Pattern During the Infeed Swaging of Tube Without Mandrel

2015 ◽  
Author(s):  
Dong Mu ◽  
Qi Zhang ◽  
Fei Zeng ◽  
Fengjun Wang
Keyword(s):  
Stress State ◽  
Axial Stress ◽  
Metal Flow ◽  
Circumferential Stress ◽  
Three Dimensional ◽  
Axial Direction ◽  
Deformation Pattern ◽  
Fe Model ◽  
Simulation Code ◽  
High Production Rate

Infeed swaging is a type of rotary swaging process. It is usually used to reduce the cross section from the beginning to the end of the tube. Compared with the infeed swaging with mandrel, the infeed swaging without mandrel has the advantages of less-loading, chipless forming, giving high production rate and low tool costs. It has been widely used in aeronautic and automotive industries. In this paper, using the finite element (FE) simulation code, TRANSVALOR FORGE 2011, three-dimensional (3D) FE model and experiment were developed to investigate the stress state and deformation pattern during the infeed swaging of tube without mandrel. Results show that the stress state varies with the regions. In the sinking zone, the stress state in the middle of the tube is biaxial compressive, while that at the other regions is triaxial. In the forging zone, the material suffers from tensile axial stress, compressive thickness stress and circumferential stress. After unloading, tensile residual stresses occur at the forging zone and the inner surface in the sinking zone. The maximum tensile residual stress is 69.5MPa, which is 77.3% of the yield stress. In the sinking zone, more metal flows radially inside and the deformation type is compressive. In the forging zone, more material tends to flow along the axial direction. The deformation type in the forging zone is tensile. Moreover, experiments were also conducted to validate the FE model. The experimental and simulated results have a good agreement. After the infeed swaging, the microstructure of the tube became smaller and denser. The metal flow lines are continuous, contributing to improve the strength and the fatigue life of tube.

Feed Speed Design and Optimization in Radial-Axial Ring Rolling Process by FEM

2011 ◽  
Vol 421 ◽  
pp. 513-521
Author(s):  
Shi Biao Liu ◽  
Ke Lu Wang ◽  
Shi Qiang Lu ◽  
Xin Li ◽  
Xian Juan Dong
Keyword(s):  
Rolling Force ◽  
Effective Strain ◽  
Rolling Process ◽  
Ring Rolling ◽  
Fe Model ◽  
Feed Speed ◽  
Rigid Plastic ◽  
Axial Ring ◽  
Ring Rolling Process

Radial-axial ring rolling is an important component of advanced manufacturing technology, but it has characteristics of high nonlinear on geometry and physics, so the radial-axial ring rolling process becomes very complex. In addition, the feeding mode of core roller has enormous influence on the quality of the rolled ring as well as the stability of the process. In this paper, a 3D rigid-plastic FE model of radial-axial ring rolling process is established, then three kinds of feed speed design ((1)constant of feed speed; (2)constant of feed in one rotary; (3)variation of feed speed)are offered. The difference of outer radius growth velocity, distribution of effective strain and temperature, rolling force, size of ring are analysised for the three kinds of feed methods. And, an optimized feed method is proposed base on analytic results, the optimized feed method can improve the quality of formed ring, and decrease the requirement of ring rolling mill.

scholarly journals Investigation of brick masonry with using of bad quality of bricks and reinforced concrete frame

2019 ◽  
Vol 258 ◽  
pp. 04008
Author(s):  
Andreas Triwiyono ◽  
I Gusti Lanang Bagus Eratodi
Keyword(s):  
Load Capacity ◽  
Three Dimensional ◽  
Material Model ◽  
Poor Quality ◽  
Brick Masonry ◽  
Fe Model ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Standard Quality

In some region typical resident houses are made of brick masonry. Ministry of Public Work Indonesia and JICA [2] have published a guideline as key requirements for safer houses. A study was carried out to obtain the effect of disparities material quality on the performance of the brick masonry. Six wall specimens were experimentally tested in-plane direction until failure by observing deformation, cracks, and uprooting of the wall. Study based on the finite element was also used by implementing the three-dimensional stress state of concrete and masonry and elastic-plastic for reinforcement. From the study it can be concluded that: the wall following guideline has enough strength but could not reach the load capacity because the wall was uprooted. Bad quality of concrete did not affect the stiffness and strength of the walls. The strength of the walls with a poor quality of mortar and poor quality of bricks comparison to the wall with standard quality of bricks had the strength of about 78%. Wall without plastering with a poor quality of the bricks, mortar, and concrete reduced the strength and stiffness to about 41% compared to the wall with standard quality. The proposed FE model can predict the strength of the wall well but not for its stiffness. The model especially the masonry material model still needs to be developed in order to obtain the close result with the laboratory test.

Effect of Boosting Velocity on Forming Quality of High-Strength TA18 Titanium Alloy Tubes in Numerical Control Bending

2017 ◽  
Vol 748 ◽  
pp. 197-201 ◽  
Author(s):  
Jun Fang ◽  
Chuang Liang ◽  
Shi Qiang Lu ◽  
Ke Lu Wang
Keyword(s):  
Cross Section ◽  
Three Dimensional ◽  
High Strength ◽  
Numerical Control ◽  
Wall Thickening ◽  
Fe Model ◽  
Forming Quality ◽  
Wall Thinning ◽  
Nc Bending

In order to reveal the effect laws of boosting velocity on forming quality of tube bending. A three dimensional (3D) elastic plastic finite element (FE) model of whole process of high-strength TA18 tubes in numerical control (NC) bending was established based on the FE code of ABAQUS, and its reliability was validated by using the experimental results in literature. Then, the effect laws of boosting velocity on deformation behaviors of high-strength TA18 tubes in NC bending were explored with respect to multiple defects such as wall thinning, wall thickening, cross section deformation and springback. The results show that wall thinning ratio decreases with the increasing of boosting velocity; wall thickening ratio increases with the increasing of boosting velocity; cross section deformation ratio decreases with the increasing of boosting velocity; springback decreases slightly with the increasing of boosting velocity.

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