mill vibration during cold rolling

Vertical Vibration Model for Unsteady Lubrication in Rolls ...

The main objective of this study was to develop a mill vibration monitoring method and an intelligent algorithm for mill chatter early warning. Rolling experiments showed that the proposed monitoring method could be a promising and effective technique for assessing the chatter phenomenon. The mill vibration acceleration amplitude prediction performance of a support vector regression, neural …

Simulation on Hydraulic-Mechanical Coupling Vibration of ...

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 …

Active chatter damping for cold rolling mills | SMS group

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.

Detecting critical vibrations in rolling mills - iba

A rolling mill that includes the driving system was modeled by multibody dynamics to investigate the cause and characteristics of the chatter vibration. The proposed numerical model was validated by theoretical analysis and an experiment that was carried out during manufacturing.

Deformation Processing - Rolling

Oct 10, 2020· Based on vibration problems of a six roller cold rolling mill, hydraulic-machinery coupling vibration system dynamic model of the 2180mm 4-stand tandem cold rolling mills …

Chatter in Cold Rolling - ScienceDirect

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 ...

Experimental and Numerical Investigation of the Vibration ...

Mar 26, 2002· Models for the occurrence of the vibrational instability during rolling known as third octave chatter are presented and discussed. An analysis of rolling mill chatter was performed for the purpose of identifying characteristics of the vibrations and to determine any dependency on the rolling …

Active chatter damping for cold rolling mills | SMS group

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 ...

(PDF) VIBRATION MONITORING OF TANDEM MILLS AT THE …

The rolling process is shown in Fig. 2.1: Rolling is done both hot and cold. It is accomplishes in rolling mills. A rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc. Rollers may be plain or grooved depends upon the shape of rolled product.

CHATTERBLOCK CHATTER VIBRATION IN COLD ROLLING*

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 ...

Vibration Instability in Rolling Mills: Modeling 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 ...

Cold Rolling - process overview - EngineeringClicks

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

Experimental and Numerical Investigation of the Vibration ...

The dynamic model of 4-h mill, which couples with the rolling process model, the mill roll stand structure model, and the hydraulic servo system model, is built by analyzing the vibration process of cold rolling.

CHATTERBLOCK CHATTER VIBRATION IN COLD ROLLING*

As a result of the observations, we immediately identified these stripes as mill chatter marks. We then arranged for vibration measurements to be carried out on the cold rolling mill. Vibration measurements. Each of the roll chocks had accelerometers attached which sensed motion in …

Dynamic analysis of vibration stability in tandem cold ...

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 motion of critical components. Rolling mill vibration is no different.

Vibration analysis of a Sendzimir cold rolling mill and ...

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 ...

Vibration analysis and numerical simulation of rolling ...

The tandem cold mill vibration known as chatter or rumble is a rolling phenomenon occurring in mills throughout the world. It affects the very cornerstones of an operation; quality and product ...

Experimental and Numerical Investigation of the Vibration ...

Jan 01, 1982· A basic theory of chatter in. cold rolling is presented which is based on the effect of the variable scrip tension on the rolling force as well as on the variations of contact length The structure of a computer program simulating chatter of a tandem mill is presented and examples given of the effect of rolling speed, strip width, coefficient of friction and of using a tuned damper.

Vibration analysis of a Sendzimir cold rolling mill and ...

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 ...

Active chatter damping for cold rolling mills | SMS group

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

Study on vibration characteristics of rolling mill based ...

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 ...

Coupling vibration model for hot rolling mills and its ...

Oct 01, 2018· Since vibrations mainly occur at higher speeds, in most cases the rolling speed of single- or multi-stand mills for steel and aluminum has to be limited. The most critical vibration issues when running cold rolling mills are the 3 rd Octave Chatter (100 Hz – 160 Hz) and the 5 …

Vertical Vibration Model for Unsteady Lubrication in Rolls ...

The main objective of this study was to develop a mill vibration monitoring method and an intelligent algorithm for mill chatter early warning. Rolling experiments showed that the proposed monitoring method could be a promising and effective technique for assessing the chatter phenomenon. The mill vibration acceleration amplitude prediction performance of a support vector regression, neural …

Simulation on Hydraulic-Mechanical Coupling Vibration of ...

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 …

Active chatter damping for cold rolling mills | SMS group

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.

Detecting critical vibrations in rolling mills - iba

A rolling mill that includes the driving system was modeled by multibody dynamics to investigate the cause and characteristics of the chatter vibration. The proposed numerical model was validated by theoretical analysis and an experiment that was carried out during manufacturing.

Deformation Processing - Rolling

Oct 10, 2020· Based on vibration problems of a six roller cold rolling mill, hydraulic-machinery coupling vibration system dynamic model of the 2180mm 4-stand tandem cold rolling mills …

Chatter in Cold Rolling - ScienceDirect

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 ...

Experimental and Numerical Investigation of the Vibration ...

Mar 26, 2002· Models for the occurrence of the vibrational instability during rolling known as third octave chatter are presented and discussed. An analysis of rolling mill chatter was performed for the purpose of identifying characteristics of the vibrations and to determine any dependency on the rolling …

Active chatter damping for cold rolling mills | SMS group

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 ...

(PDF) VIBRATION MONITORING OF TANDEM MILLS AT THE …

The rolling process is shown in Fig. 2.1: Rolling is done both hot and cold. It is accomplishes in rolling mills. A rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc. Rollers may be plain or grooved depends upon the shape of rolled product.

CHATTERBLOCK CHATTER VIBRATION IN COLD ROLLING*

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 ...

Vibration Instability in Rolling Mills: Modeling 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 ...

Cold Rolling - process overview - EngineeringClicks

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

Experimental and Numerical Investigation of the Vibration ...

The dynamic model of 4-h mill, which couples with the rolling process model, the mill roll stand structure model, and the hydraulic servo system model, is built by analyzing the vibration process of cold rolling.

CHATTERBLOCK CHATTER VIBRATION IN COLD ROLLING*

As a result of the observations, we immediately identified these stripes as mill chatter marks. We then arranged for vibration measurements to be carried out on the cold rolling mill. Vibration measurements. Each of the roll chocks had accelerometers attached which sensed motion in …

Dynamic analysis of vibration stability in tandem cold ...

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 motion of critical components. Rolling mill vibration is no different.

Vibration analysis of a Sendzimir cold rolling mill and ...

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 ...

Vibration analysis and numerical simulation of rolling ...

The tandem cold mill vibration known as chatter or rumble is a rolling phenomenon occurring in mills throughout the world. It affects the very cornerstones of an operation; quality and product ...

Experimental and Numerical Investigation of the Vibration ...

Jan 01, 1982· A basic theory of chatter in. cold rolling is presented which is based on the effect of the variable scrip tension on the rolling force as well as on the variations of contact length The structure of a computer program simulating chatter of a tandem mill is presented and examples given of the effect of rolling speed, strip width, coefficient of friction and of using a tuned damper.

Vibration analysis of a Sendzimir cold rolling mill and ...

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 ...

Active chatter damping for cold rolling mills | SMS group

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

Study on vibration characteristics of rolling mill based ...

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 ...

Coupling vibration model for hot rolling mills and its ...

Oct 01, 2018· Since vibrations mainly occur at higher speeds, in most cases the rolling speed of single- or multi-stand mills for steel and aluminum has to be limited. The most critical vibration issues when running cold rolling mills are the 3 rd Octave Chatter (100 Hz – 160 Hz) and the 5 …