Effect of Strip Size on Neutral Angle during a Novel Semisolid Shearing-Rolling Process

2012 ◽  
Vol 446-449 ◽  
pp. 216-219
Author(s):  
Ren Guo Guan ◽  
Zhan Yong Zhao ◽  
Run Ze Chao ◽  
Qiu Sheng Zhang ◽  
Chun Ming Liu
Keyword(s):  
Rolling Process ◽  
Strip Thickness ◽  
Strip Width ◽  
Neutral Angle

Based on the SCR process, semisolid shearing-rolling process was proposed. Effect of strip size on neutral angle during the process was analyzed. Neutral angle decreases gradually with the increment of the strip width. When the strip width is less than 40 mm, the neutral angle decreases more obviously with the increment of the strip width. When the strip width is greater than 40 mm, the neutral angle decreases slowly with the increment of the strip width. The neutral angle decreases gradually with the decrease of the strip thickness. Neutral angle is mainly affected by the strip thickness.

Effects of Strip Thickness Difference on Deviation in Aluminum Hot Rolling

2013 ◽  
Vol 690-693 ◽  
pp. 2226-2231
Author(s):  
Li Yong Ma ◽  
Yi Lun Liu ◽  
Xian Qiong Zhao ◽  
Chi Liu
Keyword(s):  
Hot Rolling ◽  
Rolling Process ◽  
Strip Thickness ◽  
Asymmetry Factor ◽  
Fe Model ◽  
Deviation Function ◽  
Characteristic Quantity ◽  
Hot Rolling Process ◽  
The Relationship

In aluminum hot rolling process, strip thickness difference plays a more important role in deviation. An FE model was presented to simulate the rolling process in which strip thickness difference was taken as a horizontal asymmetry factor of disturbance. Parameters information of nodes is processed, with the characteristic quantity of deviation and the asymmetrical thickness difference rate calculated. The result of simulation illustrates the deviation result under the disturbance of thickness difference, and the relationship among deviation function, characteristic quantity of deviation and the asymmetrical thickness difference rate. Deviation tracks under these circumstances are figured out. The effect of thickness difference on deviation in aluminum tandem hot rolling is revealed.

Stability Analysis of Chatter in Tandem Rolling Mills—Part 2: The Regenerative Effect

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Huyue Zhao ◽  
Kornel F. Ehmann
Keyword(s):  
Stability Analysis ◽  
Time Delay ◽  
Modulation Frequency ◽  
Rolling Process ◽  
Strip Thickness ◽  
Analytical Models ◽  
Rolling Mills ◽  
Propagation Paths ◽  
Thickness Variations ◽  
Delay Differential

Using the multi-stand chatter models derived in Part 1, a stability analysis, based on the integral criterion of stability for delay differential equations, will be carried out for the regenerative mechanism to better understand the effects of rolling parameters on regenerative instability. It will be shown that the interactions between consecutive stands through the time delay effect of the strip thickness variations consistently boost the tendency of each stand to chatter and, therefore, reduce the stability of the rolling process. Simulations will demonstrate stable and unstable behaviors of multi-stand rolling mills and aid in verifying stability charts created through stability analysis based on analytical models. They will be instrumental in identifying the critical vibration propagation paths of the regenerative mechanism in multi-stand mills through strip thickness and instant inter-stand tension variations. The critical vibration propagation paths of the regenerative mechanism will explain the modulation frequency observed in tandem mills that, as it will be shown, is inversely proportional to the shortest time delay during strip transport from the upstream stands to the downstream stands.

scholarly journals Non-intrusive measurement of strip thickness and roll-bite length in metal rolling

2020 ◽  
Vol 234 (10) ◽  
pp. 1283-1292
Author(s):  
GJ Adeyemi ◽  
RS Dwyer-Joyce ◽  
C Pinna ◽  
A Hunter ◽  
JT Stephen ◽  
...  
Keyword(s):  
Measurement Techniques ◽  
Piezoelectric Element ◽  
Rolling Process ◽  
Ultrasonic Pulse ◽  
Strip Thickness ◽  
In Situ Measurement ◽  
Rolled Strip ◽  
Thickness Standard ◽  
Roll Bite

It is important to monitor the rolled strip thickness standard to minimize material waste and loss of profit due to strip flatness defects, and also to maintain the product’s size and dimensional homogeneity. Several online measurement techniques are available but none of this can give an in situ measurement within the roll bite. Due to this, a novice experimental method utilizing ultrasonic reflection sensor mounted on one roll was developed for in situ measurement of strip thickness and roll-bite length during cold rolling process. A pitch–catch method was used whereby a piezoelectric element generated an ultrasonic pulse and transmitted to the contact interface evaluated on a pilot mill. The reflected signal was captured by a second piezoelectric element and analysed to determine the condition at the strip–roll interface. This approach was implemented on a pilot mill and reflections from various locations in the roll bite during the rolling were recorded. Recorded signals were used to estimate the rolled strip thickness and roll-bite length after the rolling process.

The Application of Steady-State Thermal Expansion of the Rolls in Thickness Setup Model for HSM

2014 ◽  
Vol 941-944 ◽  
pp. 1696-1699
Author(s):  
Geng Sheng Ma ◽  
Fang Chen Yin ◽  
Xiao Yan Zhu ◽  
Wen Peng ◽  
Jian Zhao Cao ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Temperature Field ◽  
Steady State ◽  
Rolling Process ◽  
Strip Thickness ◽  
Rolled Strip ◽  
Adaptive Model ◽  
Finite Element Software ◽  
Long Time ◽  
Hot Rolled

The hot rolled strip thickness accuracy sometimes can not be guaranteed after a long time for waiting for slabs or other reasons. The reason is when rolling, the rollgap adaptive model has considered the thermal expansion of the roll. So when rolling is restarted, thermal expansion of the rolls must be cleared in order to accurately calculate the setup rollgap value. The finite element software ANSYS is used to calculate the temperature field and thermal expansion amount of the rolls in the rolling process. Application results show that this method can improve the accuracy of strip thickness.

FEM Analysis of Rolling Pressure Along Strip Width in Cold Rolling Process

2007 ◽  
Vol 14 (5) ◽  
pp. 22-26 ◽  
Author(s):  
Xiang-hua Liu ◽  
Xu Shi ◽  
Shan-qing Li ◽  
Jian-yong Xu ◽  
Guo-dong Wang
Keyword(s):  
Cold Rolling ◽  
Fem Analysis ◽  
Rolling Process ◽  
Strip Width ◽  
Rolling Pressure

scholarly journals Self-regulation during continuous rolling in broadband mills

2018 ◽  
pp. 309-316
Author(s):  
V.V. Verenev ◽  
N.I. Podobedov
Keyword(s):  
Self Regulation ◽  
Rolling Process ◽  
Strip Thickness ◽  
The Self ◽  
Rolled Strip ◽  
Continuous Rolling ◽  
Short Term ◽  
Continuous Band ◽  
Hot Rolling Mill ◽  
The Stability

The aim of the work is the development of ideas about the regulation of the rolling process in continuous groups of stands of a wide-strip hot rolling mill. By mathematical modeling of the dynamics of the interaction of the stands during continuous rolling, taking into account torsional vibrations and transport transfer, the duration of the self-regulation time of the six-yielding group was determined. It is shown that the parameters of the rolled strip significantly affect the nature of the change in tensions and deviations of the strip thickness after each stand. During the filling of a continuous band with a strip in the mill stands, there are perturbations caused by the capture of the strip by the rolls of each stand. The task of regulatory actions at this point can increase the destabilization of the process. The thickness of the rolled strip slightly affects the self-regulation time of the continuous rolling process. In the modes of rolling and filling the group with a strip, this time was ~ 14 s from the beginning of the disturbance at the entrance to the group. The signs of perturbations and their combinations are determined by the deviation of the strip thickness and temperature, at which a short-term loss of process stability is possible due to a drop in tension in some intervals. It has been established that there are such combinations of perturbation signs in thickness and strip temperature when a group disintegrates into two unrelated ones, which leads to a violation of the stability of the tension process. The above features of self-regulation should be considered when managing the process of continuous rolling.

Effect of Strip Size on Neutral Angle during a Novel Semisolid Shearing-Rolling Process

2012 ◽  
Vol 446-449 ◽  
pp. 216-219
Author(s):  
Ren Guo Guan ◽  
Zhan Yong Zhao ◽  
Run Ze Chao ◽  
Qiu Sheng Zhang ◽  
Chun Ming Liu
Keyword(s):  
Rolling Process ◽  
Neutral Angle

An Automatic Control Strategy of Strip Width in Cold Rolling

2014 ◽  
Vol 1004-1005 ◽  
pp. 1221-1225
Author(s):  
Ji Lai Yu ◽  
Ting Quan Gu ◽  
Jian Guo Wang
Keyword(s):  
Cold Rolling ◽  
Automatic Control ◽  
Control Strategy ◽  
Rolling Force ◽  
Rolling Process ◽  
Strip Width ◽  
Rolled Material ◽  
Feed Forward Control ◽  
The Stability ◽  
Hot Rolled

This paper proposes an automatic control strategy of the strip width in cold rolling process. The prediction model for the exit strip width of each stand is established. In addition to the strip width variation of the incoming hot-rolled material between the measured and the pre-set values, the variations of the rolling force, tension, bending force and the roll shift amount of each stand are utilized to model and forecast the stand exit width deformation. Then, the model can be used to determine the compensation values of the different profile adjustment mechanism and the exit strip width can be controlled in high accuracy. In this way, the effect of the strip width variation of the incoming hot-rolled material and the fluctuation of the stand rolling process parameters on the exit strip width can be eliminated. Moreover, the feed-forward control of the strip width can reduce the incidence of abnormal situation, such as the strip breakage and off-tracking ,and improve the stability of the cold rolling process.

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