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  • Mill Vibration Phenomena during Cold Rolling Innoval

    Mill Vibration Phenomena during Cold Rolling. All machines vibrate during operation. However, only a few of these vibrations cause problems to the product or the machine itself. Typically, the most damaging vibrations involve a natural resonance of the machine which significantly increases the

  • Prediction and analysis of cold rolling mill vibration

    Nov 01, 2020· A mill vibration monitoring system was developed to monitor the oscillating movements of the rolls in the tandem cold rolling mill. A sketch of the rolling mill vibration data monitoring system and the specific locations of the sensors (locations A, B, C, and D) were shown in Fig. 3.Location A was the operation side of the bottom work roll (WR) bearing, location B was the operation side of the

  • Model for the solution of metal rolling mill vibration

    In common with other rotating machines, rolling mills are prone to many different vibrations during rolling and most do not cause a problem. However, there are several types of rolling mill vibration that can have a significant impact on the quality and/or productivity of the cold rolling process.

  • Experimental and Numerical Investigation of the Vibration

    3.1. Vibration Measurement of the Rolling Mill The cold rolling process is usually conducted with a workpiece that is initially at room temperature. A schematic illustration of the 6-high cold rolling mill is shown in Fig. 1.11) The stands are arranged to produce a sequential reduc-tion in the thickness of the strip. Work rolls are the tools

  • Dynamic analysis of vibration stability in tandem cold

    Oct 01, 2019· Valigi et al. (2014) investigated the chatter marks and vibration phenomenon in a six-high cold rolling mill, and pointed out that the typical vibration frequency of the six-high cold rolling mill was still within the range of third-octave mode chatter. Recently, mill chatter has been recognized as the bottleneck in high speed rolling.

  • mill vibration during cold rolling miccwire.es

    Mill chatter in tandem cold rolling mill is a major rejection to the quality and production of the strips In most mill vibration models, either the roll mass is usually limited to vibrate in vertical direction and vertical-horizontal directions, or the multiple rolls system is simplified to a single mass system However, the torsional chatter is

  • Active chatter damping for cold rolling mills SMS group

    Aug 14, 2018· Mill vibrations (chatter) especially occurring at high rolling speeds affect product quality of the cold-rolled material and thus lead to yield losses and quality issues. Among other supportive measures active chatter damping has turned out to be an effective approach to counteract these problems by significantly reducing vibration issues of

  • CHATTERBLOCK CHATTER VIBRATION IN COLD ROLLING*

    and 150Hz, is a self-excited vibration phenomena typically occurring in the rear stands of tandem cold mills. It can produce significant gauge variations and even cause strip breaks. 3rd octave mill chatter is characterized by a quickly diverging vertical vibration of the rolls for specific rolling conditions (material, mill speed, forces,

  • Detecting critical vibrations in rolling mills iba

    Jun 13, 2019· Cold rolling mills show a complex vibration behavior, consisting of natural vibrations of the plant mechanics as well as excitations from the drive or bearings but also vibrations caused by defects. The aim of the monitoring is to detect vibrations that are caused by external excitation or faults.

  • Vibration analysis of a Sendzimir cold rolling mill and

    The presence of several rolls in cluster cold rolling mills makes on-line vibration monitoring and failure analysis difficult. The dynamic behaviour of rolls strongly depends on the rolling pressure in the roll bite. Strip vibration applies a dynamic component on the rolling force acting on the work roll and may excite the resonance of the mill

  • Experimental and Numerical Investigation of the Vibration

    3.1. Vibration Measurement of the Rolling Mill The cold rolling process is usually conducted with a workpiece that is initially at room temperature. A schematic illustration of the 6-high cold rolling mill is shown in Fig. 1.11) The stands are arranged to produce a sequential reduc-tion in the thickness of the strip. Work rolls are the tools

  • mill vibration during cold rolling miccwire.es

    Mill chatter in tandem cold rolling mill is a major rejection to the quality and production of the strips In most mill vibration models, either the roll mass is usually limited to vibrate in vertical direction and vertical-horizontal directions, or the multiple rolls system is simplified to a single mass system However, the torsional chatter is

  • Vertical Vibration Model for Unsteady Lubrication in Rolls

    The cold rolling process is a high speed, transient, and time-related metal machining molding process [1]. As cold rolling mill is a multimass and rotary motion object system, the vibration as an implicit factor commonly exists in the course of its operation, but it usually does not apparently present due to the conditional constraints of

  • (PDF) VIBRATION MONITORING OF TANDEM MILLS AT THE

    Mill vibration during cold rolling. February 2007. T. Farley; In common with other rotating machines, rolling mills are prone to many different vibrations during rolling and most do not cause a

  • Adaptive Torsional Vibration Control of the Nonlinear

    This paper studies the torsional vibration suppression control problem for the nonlinear rolling mill main drive system with performance constraint requirements and unknown measurement sensitivities. Firstly, considering the nonlinear friction between the roll gaps, a torsional vibration model of the main drive system of rolling mill is established.

  • Coupling vibration model for hot rolling mills and its

    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

  • Cold Rolling process overview EngineeringClicks

    Jan 21, 2019· Cold rolling is a process that occurs after hot rolling in order to reduce the thickness, increase the yield and tensile strength and pliability of metal. It is a relatively expensive and labour-intensive process, but the improved mechanical properties increase the value of the finished product, whether that is a sheet, strip, or coil.

  • CONTROL PROCESS FOR A COLD ROLLING MILL BY

    most important parts of cold rolling mills. This phenomenon causes severe damage for the mill machine and strip quality (Fig. 1). Fig. 1. Strip faults, due to rolling mill vibration The integrated control process is made to analyse the vibrations which are produced

  • A Review on Chatter Analysis in Cold Rolling process

    variation due to roll vibration, friction and cooling during process. According to the frequency of vibrations, generally there are three kind of vibration consider during cold roll forming which may influences chatter marks [4] such as: a. Low frequency torsional vibration (5-20Hz) which is associated with drive train and small thickness

  • Reliability Achievement Silver Award: Improving Mill

    Figure 2 is a scatter plot used by UPI’s Applied Reliability Group (ARG) to evaluate mill vibration during a period of production. On 7/26/2010, a set of work rolls that had both integer ratio and grinder pattern were inserted into the mill.

  • Vibration Based Condition Monitoring ofRolling Mill

    In the present paper Rolling Mill -2 is considered. As this Rolling Mill is older therefore defects such as a) looseness of fasteners and belts, b) mis-alignment of parts, c) wear out of the components such as gear teeth, bushes, couplings and bearings are observed during inspection, which