scholarly journals A Feeding Strategy in Inner L-Shape Ring Hot Rolling Process

2017 ◽  
Vol 2017 ◽  
pp. 1-17
Author(s):  
Wen Meng ◽  
Feifan Wang ◽  
Yanjin Guan
Keyword(s):  
Feeding Strategy ◽  
Equivalent Plastic Strain ◽  
Rolling Process ◽  
Middle Part ◽  
Outer Radius ◽  
Ring Rolling ◽  
Inner Radius ◽  
Die Structure ◽  
Rolled Ring ◽  
Higher Temperature

In order to make the inner L-shape ring polling process with a closed die structure (ILRRCDS) on the top and bottom of the driven roll stable, at first, this paper established the mathematical model for ILRRCDS. Then, the plastic penetration and biting-in conditions for ILRRCDS were deduced based on plain ring rolling theory. Moreover, a feeding strategy that can realize a constant growth of the ring’s outer radius was proposed and the reasonable value ranges of the feed rate of the mandrel were determined. The numerical simulation model for ILRRCDS is established based on ABAQUS software. Finally, the equivalent plastic strain (PEEQ) and temperature distributions of rolled ring were obtained. The results indicated that the proposed feeding strategy can realize a stable ILRRCDS. At the end of ILRRCDS, the PEEQ at the inner radius surface of the ring is maximum, the PEEQ at the outer radius surface of the ring takes the second place, and the PEEQ at the middle part of ring is minimum. With the increase of rolling time, the higher temperature zone of the rolled ring gradually moves from the center part of the ring to the “inner corner zone” of the ring.

scholarly journals A Mandrel Feeding Strategy in Conical Ring Rolling Process

2014 ◽  
Vol 2014 ◽  
pp. 1-13
Author(s):  
Wen Meng ◽  
Guoqun Zhao ◽  
Yanjin Guan
Keyword(s):  
Feed Rate ◽  
Feeding Strategy ◽  
Simulation Method ◽  
Rolling Process ◽  
Ring Rolling ◽  
Fe Model ◽  
Die Structure ◽  
Value Range ◽  
Ring Rolling Process

A mathematical model for radial conical ring rolling with a closed die structure on the top and bottom of driven roll, simplified as RCRRCDS, was established. The plastic penetration and biting-in conditions in RCRRCDS process were determined. A mandrel feeding strategy for RCRRCDS process was proposed. The mandrel feed rate and its reasonable value range were deduced. The coupled thermal-mechanical FE model of RCRRCDS process was established. The reasonable value range of the mandrel feed rate was verified by using numerical simulation method. The results indicate that the reasonable value range of the mandrel feed rate is feasible, the proposed mandrel feeding strategy can realize a steady RCRRCDS process, and the forming quality of conical ring rolled by using the proposed feeding strategy is better than that of conical ring rolled by using a constant mandrel feed rate.

scholarly journals The Effects of Forming Parameters on Conical Ring Rolling Process

2014 ◽  
Vol 2014 ◽  
pp. 1-18
Author(s):  
Wen Meng ◽  
Guoqun Zhao ◽  
Yanjin Guan
Keyword(s):  
Growth Rate ◽  
Equivalent Plastic Strain ◽  
Rolling Process ◽  
Outer Radius ◽  
Ring Rolling ◽  
Obtuse Angle ◽  
Fe Model ◽  
Rolling Moment ◽  
Temperature Distributions ◽  
Ring Rolling Process

The plastic penetration condition and biting-in condition of a radial conical ring rolling process with a closed die structure on the top and bottom of driven roll, simplified as RCRRCDS, were established. The reasonable value range of mandrel feed rate in rolling process was deduced. A coupled thermomechanical 3D FE model of RCRRCDS process was established. The changing laws of equivalent plastic strain (PEEQ) and temperature distributions with rolling time were investigated. The effects of ring’s outer radius growth rate and rolls sizes on the uniformities of PEEQ and temperature distributions, average rolling force, and average rolling moment were studied. The results indicate that the PEEQ at the inner layer and outer layer of rolled ring are larger than that at the middle layer of ring; the temperatures at the “obtuse angle zone” of ring’s cross-section are higher than those at “acute angle zone”; the temperature at the central part of ring is higher than that at the middle part of ring’s outer surfaces. As the ring’s outer radius growth rate increases at its reasonable value ranges, the uniformities of PEEQ and temperature distributions increase. Finally, the optimal values of the ring’s outer radius growth rate and rolls sizes were obtained.

Effect of Drive Roll Rotation Speed on Ring Rolling Process

2011 ◽  
Vol 189-193 ◽  
pp. 2586-2592
Author(s):  
Jie Zhou ◽  
Xiao Tao Gong ◽  
Xiao Bing Yang ◽  
Wu Jiao Xu
Keyword(s):  
Rotation Speed ◽  
Rolling Force ◽  
Metal Flow ◽  
Equivalent Plastic Strain ◽  
Rolling Process ◽  
Ring Rolling ◽  
Rolled Ring ◽  
Rolling Torque ◽  
Ring Rolling Process ◽  
Drive Roll

Based on the platform ABAQUS, 3-D FEA model for ring rolling has been constructed to investigate the effect of drive roll rotation speed on the metal flow in the ring rolling process. It can be seen clearly that the axial metal flow in the outside diameter of the rolled ring increases with the increasing of drive roll rotation speed and with the decreasing of the feeding magnitude per revolution , which causes the increasing of fishtail coefficient FT and maximum spread coefficient and in turn makes the quality deterioration of end-plane in the rolled ring. The rolling force and rolling torque necessary to execute the rolling process are reduced when the drive roll rotation speed is elevated, which results in the lower requirement for the characteristic of force and energy in the rolling machine. Besides that, average equivalent plastic strain PEEQ also increases, which indicates the enhancement of plastic deformation and is beneficial to the improvement of the mechanical property of the formed ring. But one point that we should pay attention is that uneven deformation and possibility of the inner defects in the rolled ring might be increased with the increasing of the drive roll rotation speed.

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.

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.

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.

The Optimal Design for Ring Blank Dimensions in Inner L-Shaped Ring Rolling Process

2014 ◽  
Vol 599-601 ◽  
pp. 511-516
Author(s):  
Wen Meng ◽  
Guo Qun Zhao ◽  
Yan Jin Guan
Keyword(s):  
Optimal Design ◽  
Feed Rate ◽  
Rolling Process ◽  
Ring Rolling ◽  
Fe Model ◽  
Deformation Characteristics ◽  
Rolled Ring ◽  
Value Range ◽  
Ring Rolling Process ◽  
Ring Blank

As the needs of profiled rings continuously increase, studies about profiled ring rolling processes is becoming a hot problem. This paper established a FE model of hot ring rolling process of inner L-shaped ring based on ABAQUS/Explicit software. The reasonable value range of mandrel feed rate is determined at first. Then the deformation characteristics of rings are analyzed and compared in L-shaped ring rolling process under four different ring blank dimensions. Finally, for realizing a steady rolling process and obtaining good dimensions properties of rolled ring, an appropriate ring blank dimension is given.

Influence of the Intermediate Annealing on Deformation Ability of the Cold Rolled Ring

2014 ◽  
Vol 893 ◽  
pp. 644-648
Author(s):  
Wen Ting Wei ◽  
Xun Peng Qin ◽  
Song Deng
Keyword(s):  
Rolling Process ◽  
Ring Rolling ◽  
Thickness Reduction ◽  
Intermediate Annealing ◽  
Characterization Methods ◽  
Hardness Tester ◽  
Cold Ring Rolling ◽  
Rolled Ring ◽  
Deformation Ability ◽  
Cold Rolled

This paper studies the influence of the intermediate annealing on deformation ability of the cold rolled ring. The results show that: intermediate annealing can improve the ability of plastic deformation of the cold rolled ring, ring rupture occurred after 62.5% thickness reduction, on the other side the ring suffering intermediate annealing still be intact by rolling to upon 64.8% thickness reduction. The mechanism of the intermediate annealing improving deformation ability of cold rolled ring is explored by using optical microscopy, scanning electron microscopy, micro hardness tester and other materials characterization methods. It is found that after intermediate annealing, the amount of carbide particles significantly reduce and the hardness decrease. Meanwhile, dissolution of partial carbides occur during the cold ring rolling process, and with the increasing of the cold rolling deformation, the quantity of the dissolution of cementite in pearlite will increase, which resulting in the improvement of the deformability of the cold rolled ring.

Influences of Technology Parameters of Heavy Shell Ring Rolling Mill with Double Drive Rolls Based on FEM

2011 ◽  
Vol 299-300 ◽  
pp. 874-877
Author(s):  
Jian Liang Sun ◽  
Yan Peng ◽  
Bo Ma ◽  
Hong Min Liu ◽  
Su Wen Chen ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Rolling Mill ◽  
Equivalent Plastic Strain ◽  
Rolling Process ◽  
Thermal Simulation ◽  
Ring Rolling ◽  
Simulation Test ◽  
Shell Ring ◽  
Ring Rolling Mill ◽  
Ring Rolling Process

The heavy shell ring rolling process was taken as subject investigated. Because the size of shell ring is very large and the material of shell ring is special, in order to make the shell ring to be bitten smoothly and make the rolling process stable, the double drive rolls was proposed in the shell ring rolling mill. The thermal simulation test of heavy shell ring material was made on the Gleeble 3500 thermal simulation test machine. Based on FEM, the three dimensional thermal mechanical coupled model of shell ring rolling process was built in this paper. The influences of process parameters on the stress field, strain field and mechanical parameters were investigated. Simulation results show that, with the increase of feed velocity, the strain of shell ring increases, the forging penetration condition becomes good; With the increase of friction coefficient, the equivalent plastic strain of shell ring surface layers increases, the equivalent plastic strain of shell ring middle layers has little change. The conclusions are significant for designing equipments of shell ring rolling mill and developing new rolling schedule.

Sign in / Sign up

Export Citation Format

Share Document