Jul 22 2019 The rolling mill vibration not only seriously causes the strip thickness heterogeneity but also damages the rolling mill equipment and its electrical components. Existing vibration suppression methods are passive and mainly tune mechanical hydraulic electrical and rolling process parameters. A new active vibration suppression method was thus proposed using the disturbance estimation and .
In this paper we propose an effective mechanical-electrical-hydraulic-interfacial coupling vibration model for hot rolling mills and obtain a practical measure to relieve mill vibration. First an experiment related to mill modulus control gain in automatic gauge control AGC is carried out during manufacturing. Rolling mill vibration is observed to gradually be enhanced with increasing mill .
Dec 02 2008 Many seamless tube producers in North America use cross-roll piercing mills built in the 1950s that were based on designs from the1930s. While it would be advantageous to replace such aged equipment that isnt always necessary. A minor equipment upgrade can do wonders. Improving the bar steadiersthe devices that hold the mandrel the steady as the pipe exits the millcan greatly
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Jul 01 2009 A 7-stand finishing mill is shown in Fig. 2 together with the runout table and coiler.Typical values for strip thickness temperature and speed are also given. A 4-high mill stand consists of two work rolls and two backup rolls supporting them the former having a smaller diameter as seen in Fig. 2.The backup roll supports the work roll to mitigate the deflection caused by the
Dec 01 2010 In order to build high accuracy integral dynamic models of cold rolling mill system by analyzing the vibration process of cold rolling the dynamic model of 4-h mill including the rolling process model the mill roll stand structure model and the hydraulic servo system model is built. These three models are coupled and linearized then the multiple input and multiple output MIMO linear .
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The invention concerns a rolling stand with backup rolls andor work rolls for rolling plate or strip with at least one rest bar which is arranged between chocks of one of the rolls and preferably is assigned to the upper roll with an inletoutlet guide for a medium e.g. cooling water or the like arranged next to the rest bar and with sealing means for preventing the medium from .
The unsteady lubrication is one of the major causes for self-excited vibration in rolling. But it is difficult to build a rolling chatter model which considers the unsteady lubrication state in roll bite. Using the regression exponential function model of rolling friction coefficient a dynamic rolling process model was built. Coupling the dynamic rolling process model with a mill stand .
Sep 25 2019 Hence in the stands of a four-stand mill hydraulic flexure ensures a broad regulation of the strips transverse thickness variation up to 75. Influence of Roller Wear Analysis of 34 wear profiles of rollers from the 2100 mill 14 supporting rollers and 20 working rollers shows that with increase in operating time the wear increases .
full coil is shown for a four-stand cold rolling mill with uncoiler and coiler. The process performance is very simi-lar to the one on the real plant as cor-responding process signal recordings show 6. The testing based on ghost rolling with the TCM HIL-simulator proved to be extremely efficient with respect to pre-commissioning and pre-optimiza-
A device used to lift the upper roll and prevent the impact of the rolled piece when entering and leaving the roll. The forms are spring type mostly used in profile rolling mill heavy hammer type commonly used in blooming mill with large roll movement hydraulic type mostly used in four high strip mill.
The movements of base paper such as clamping amp loosening middle moving laterally translate are driven by full hydraulic system and lifting amp lowering is driven by hydraulic system. The braking device adopts multi-point brake system. Each mill roll stand has 2 loading trolleys to realize simultaneous feeding from both sides.
Quarter-section of a 4-high mill stand with axial work roll shifting Quarter-section of a 6-high mill stand with axial longstroke intermediate roll shifting . cold rolling mill adapted to the individual re quirements of the customers product mix. Mill key components 1 Finite element optimized mill housing 2 Top mounted hydraulic roll .
Yang et al. proposed a coupling vibration model by coupling the rolling process model the mill roll stand structure model and the hydraulic servo system model meanwhile the effects of different working conditions on the stability of cold rolling mill system were discussed It contributes to the further study and suppression of coupling .
Jan 01 2005 The new steering control 23 method is more stable and strip steering has been improved by more than 50. Steering mm 1200 1000 5.CONCLUSION This paper described a newly-developed VSS control system for strip steering in hot rolling mills which is based on sliding mode control using a steering observer.
Nov 01 2014 The roughing mill is one of the most loaded parts of the steel plant it consists of two reversing 3-high mill stands with ten passes eight in first stand and two in second Fig. 1.The failures of the rolls with grooves on the 1.stand of the 3-high-roughing mill stand occurred four times Refs.
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Prevent servo valve and pump failures caused by contamination related surface degradation. Applications include Melt shop DC furnace. Automatic gauge control. Roll stand hydraulic system. Planetary amp ring rolling cold pilger mill. Caster amp Oscillator. LMS hydraulics. Tundish gate.
LQG Regulation Rolling Mill Case Study Overview of this Case Study. This case study demonstrates the use of the LQG design tools in a process control application. The goal is to regulate the horizontal and vertical thickness of the beam produced by a hot steel rolling mill.
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