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HGT Hydraulic Gyratory Crusher

HGT Hydraulic Gyratory Crusher

HGT Gyratory Crusher is a new-type intelligent coarse crusher with big capacity and high efficiency. It integrates mechanical, hydraulic, electric, automated, and intelligent controlling technologies which grant it with advantages traditional crushing

European Type Jaw Crusher PEW

European Type Jaw Crusher PEW

Jaw crushers has stationary jaw crusher, portable jaw crusher and mobile jaw crusher (crawler jaw crusher). Jaw crusher (PEW Series) is not only able to be used together with mine-selecting and gravel processing equipments but also be used independen

Jaw Crusher PE

Jaw Crusher PE

Jaw crusher is driven by a motor, and the moving jaw moves up and down via eccentric shaft. The angle between fixed jaw and moving jaw becomes smaller when the moving jaw runs down, then the materials are crushed into pieces. It will become bigger whe

HPT Hydraulic Cone Crusher

HPT Hydraulic Cone Crusher

Base on the latest technology and decades of years’ producing experience, Our Company designed the HPT series cone crusher. It has excellent crushing efficiency and good hydraulic control system. Now the HPC series cone crusher has wide application

HST Hydraulic Cone Crusher

HST Hydraulic Cone Crusher

HST Single Cylinder Hydraulic Cone Crusher is a new high-efficiency cone crusher independently researched, developed and designed by SBM through summarizing over twenty years of experience and widely absorbing advanced American and German technologies

CI5X Series Impact Crusher

CI5X Series Impact Crusher

CI5X Impact Crusher breaks materials with impact force. When materials enter the working area of hammer, they may be crushed under the high-speed shock and then thrown onto the impact device above the rotor for another crushing. Next, materials bounce

VSI6X Series Vertical Crusher

VSI6X Series Vertical Crusher

Due to the increasing market demand for the scale, intensification, energy conservation, environment protection and high-quality machine-made sand, SBM, a Chinese professional sand maker manufacturer, further optimizes the structure and function of tr

VSI5X Vertical Shaft Impact Crusher

VSI5X Vertical Shaft Impact Crusher

VSI Crushers Working Principle Raw material falls down into feed hopper, and then enters rotor through central entrance hole. It is accelerated in high-speed rotor, and then is thrown out at speed of 60-75m/s. When hitting anvil, it is crushed. Final

VSI Vertical Shaft Impact Crusher

VSI Vertical Shaft Impact Crusher

VSI Series vertical shaft impact crusher is designed by reputed German expert of SBM and every index is in worlds leading standard. It incorporates three crushing types and it can be operated 720 hours continuously. Nowadays, VSI crusher has replaced

VUS aggregate optimization system

VUS aggregate optimization system

The VU system is a global most-advanced dry-process sand-making system. The system is constructed like a tower. Its fully-enclosed layout features high integration. It integrates the functions of high-efficiency sand making, particle shape optimizatio

MTW-Z European Trapezium Mill

MTW-Z European Trapezium Mill

MTW European Grinding Mill is innovatively designed through deep research on grinding mills and development experience. It absorbs the latest European powder grinding technology and concept, and combines the suggestions of 9158 customers on grinding m

5X Series Roller Grinding Mill

5X Series Roller Grinding Mill

Grinding roller of MB5X Pendulum Roller Grinding Mill l adopts diluted oil lubrication. It is a technology initiated domestically which is maintenance-free and easy to operate. Diluted oil lubrication is oil bath lubrication, more convenient than grea

MTW Trapezium Mill

MTW Trapezium Mill

MTW European Grinding Mill is innovatively designed through deep research on grinding mills and development experience. It absorbs the latest European powder grinding technology and concept, and combines the suggestions of 9158 customers on grinding m

LM Vertical Mill

LM Vertical Mill

LM Vertical Grinding Mill integrates crushing, drying, grinding, separating and transport. The structure is simple while the layout is compact. Its occupational area is about 50% of that of the ball-milling system. The LM grinding mill can also be arr

TGM Trapezium Mill

TGM Trapezium Mill

TGM Super Pressure Trapezium Mill The operation principle of main unit of Trapezium mill is that main unit runs with the central shaft that is driven by a gear box. The top of the shaft is connected with a quincunx stand on which a grinding roller is

mill vibration during cold rolling

Mill vibration during cold rolling - researchgate.net

Download Citation Mill vibration during cold rolling In common with other rotating machines, rolling mills are prone to many different vibrations during rolling and most do not cause a problem ...

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Mill Vibration Phenomena during Cold Rolling -

Mill Vibration Phenomena during Cold Rolling Torsional chatter. The simplest type of mill vibration is found in all mills. It is a forced vibration due to roll... Problematic mill vibration. Natural resonances of the rolling mill involve translational motion of the rolls. This... Third Octave Gauge ...

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Prediction and analysis of cold rolling mill vibration ...

01-11-2020  The investigation of the plant showed that when rolling hard and thin strips at high rolling speeds, stands No. 4 and 5 chattered frequently. The dominating vibrations in the cold rolling mill were vertical vibrations. Meanwhile, the roll gap was considered to be the source of the vibration in the cold rolling mill.

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Figure 4 from Mill vibration during cold rolling ...

24-02-2021  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

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mill vibration during cold rolling - proves-projekt.de

mill vibration during cold rolling. 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 high cold rolling mill is shown in fig the stands are arranged to produce a sequential reduction in the thickness of the strip work rolls are the tools

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Detecting critical vibrations in rolling mills - iba

13-06-2019  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.

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Dynamic analysis of vibration stability in tandem

01-10-2019  Zheng et al. (2017) established a spatial vibration model of a six-high cold strip rolling mill based on multi-body transfer matrix method, and demonstrated the vibration characteristics of the mill. Recently, several attempts have been made to analyze chatter characteristics in tandem rolling mills, especially the effect of friction on vibration.

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(PDF) VIBRATION MONITORING OF TANDEM

In common with other rotating machines, rolling mills are prone to many different vibrations during rolling and most do not cause a problem.

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ALUMINIUM 2018: Anti Chatter Device reduces

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 th Octave Chatter (> 440 Hz).

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Active chatter damping for cold rolling mills SMS

14-08-2018  In cold rolling mills vibrations of mechanical parts and/or strip can interfere with several quality parameters like thickness, shape, surface quality and others. Since vibrations occur at higher speeds in most of the cases, rolling speed of single- or multi-stand mills for steel and aluminium has to be limited quite often.

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Detecting critical vibrations in rolling mills - iba

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.

More

Analysis of Vibration for Sendzimir Mill in Cold

The vibration of cluster-type mills such as the 20-high Sendzimir mill is complicated due to their multi-roll structure. In order to clarify the vibration phenomenon in the Sendzimir mill, two simulation models were developed to calculate the natural frequencies of Sendzimir mill vibration, and the frequencies of mill vibration during the cold rolling of stainless steel strip were measured.

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(PDF) VIBRATION MONITORING OF TANDEM

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 ...

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Vibration analysis and numerical simulation of

01-01-2021  Cold rolling plays a crucial role in flat steel production. In recent years, it has become extremely difficult to ignore the existence of chatter, also called “ghost vibration” by operators who work in milling plants [], which restricts the quality and efficiency of strip production.Fig. 1 shows the layout of a tandem cold rolling process.

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THE STUDY OF INFLUENCE OF WORK ROLLS VIBRATION DURING COLD ...

elastoplastic deformation during cold rolling and its surface quality. MODEL DESCRIPTION In order to reveal the mechanism of defects occur-rence on the surface of steel cold rolled strips during work rolls vibration, the finite element method imple-mented in the DEFORM-2D program was used. The 4th stand of the 5-stand mill 1700 of PAO Severstal ...

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Vibration analysis of a Sendzimir cold rolling mill

Abstract. 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

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mill vibration during cold rolling

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 ...

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1994 Asymmetrical rolling and self-excited vibration in a ...

ROLLING MILL VIBRATIONS 1 1.1 Introductio 2 n 1.2 Torsiona 3 l chatter 1.2.1 Introductio 3 n 1.2.2 Torqu (TAF) 4 e amplification factor 1.2.3 Backlas 5 h 1.2.4 Torsiona in hot rolling 6 l vibration 1.2.5 Torsiona in cold rolling 14 l vibration 1.3 Vertica 16 l vibration 1.3.1 Introductio 16 n 1.3.2 Stri and damping 1p stiffness 6

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CHATTER PREVENTION IN STANDS OF CONTINUOUS COLD ROLLING MILLS

The data control system of the mill recorded reso-nant vibration three times in the stand 4 during rolling according to the mode of Table 1, and the rolling speed oscillogram (Figure 1) shows that mill operators dropped the speed from 15 m/s to 11 m/s to prevent chatter development to dangerous levels.

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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.

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CHATTERBLOCK CHATTER VIBRATION IN COLD ROLLING*

The tandem cold mill is currently running thin gauges at rather high rolling forces. Suddenly a loud noise starts, and the mill begins to vibrate violently – it is “chatter”, more precisely and well known as 3rd octave chatter. Maybe you are lucky and you own a chatter detection system, which detects chatter

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mill vibration during cold rolling

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 ,...

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Vertical Vibration Model for Unsteady Lubrication

Vibration Model of Vertical System of Cold Rolling Mill 2.2. Unsteady Lubrication Friction Model on the Working Interface of Roll-Strip. In the mill vertical vibration... 2.3. Stress Distribution Model in Deformation Zone. In the rolling process, the metal withstands the effect of rolling... 2.4. ...

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Active chatter damping for cold rolling mills

14-08-2018  In cold rolling mills vibrations of mechanical parts and/or strip can interfere with several quality parameters like thickness, shape, surface quality and others. Since vibrations occur at higher speeds in most of the cases, rolling speed of single- or multi-stand mills for steel and aluminium has to be limited quite often.

More

Study on vibration characteristics of rolling mill

The vertical vibration often occurs during the rolling production, which has an influence on the accuracy of rolling mill. In order to effectively suppress the vertical vibration of the rolling equipment, the rolling mill model with vibration absorber device was established.

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811. Frequency analysis of chatter vibrations in tandem ...

During the cold rolling of thin metal sheets, undesired mechanical vibrations, generally referred to as chatter, are often generated. It usually lowers the surface finish of the sheet and in some cases causes gauge variation. It may also cause severe damage to the rolling mill

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CHATTER PREVENTION IN STANDS OF CONTINUOUS COLD ROLLING MILLS

The data control system of the mill recorded reso-nant vibration three times in the stand 4 during rolling according to the mode of Table 1, and the rolling speed oscillogram (Figure 1) shows that mill operators dropped the speed from 15 m/s to 11 m/s to prevent chatter development to dangerous levels.

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Coupling Dynamic Model and Control of Chatter in

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. By linearization, the multiple input multiple output linear transfer function matrix model of single stand 4-h cold mill system is ...

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Reliability Achievement Silver Award: Improving Mill ...

While most of the rolls were ground with vibration levels bel ow 0.03 mils peak-peak (p-p), some rolls exceeded 0.06 mils p-p. Rolls with high vibration levels caused excitation in the DUO Mill. A roll’s performance in the DUO Mill was found to be directly related to its grind session vibration level.

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1. Hot rolling and rolling defects: 1.1 Front and back ...

1.8 Rolling defects: Mill spring is a defect in which the rolled sheet is thicker than the required thickness because, the rolls get deflected by high rolling forces. Elastic deformation of the mill takes place. If we use stiffer rolls, namely roll material of high stiffness or elastic constant, we could avoid mill spring.

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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,

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Vibration analysis of a Sendzimir cold rolling mill

Abstract. 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

More

THE STUDY OF INFLUENCE OF WORK ROLLS VIBRATION DURING COLD ...

elastoplastic deformation during cold rolling and its surface quality. MODEL DESCRIPTION In order to reveal the mechanism of defects occur-rence on the surface of steel cold rolled strips during work rolls vibration, the finite element method imple-mented in the DEFORM-2D program was used. The 4th stand of the 5-stand mill 1700 of PAO Severstal ...

More

Vertical Vibration Model for Unsteady Lubrication

The cold rolling process is a high speed, transient, and time-related metal machining molding process [].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 factors such as various rolling processes, equipment, and ...

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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

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Dynamic behaviour of cold rolling mill with

Dynamic behaviour of cold rolling mill with unsteady lubrication roll-gap interface during sheet... 2015-01-01 00:00:00 This paper presents the results of developing a vibration model for the rolling mill vertical system with respect to the roll gap under the unsteady lubrication conditions to address the frequently self-excited vibration phenomenon of rolling mill vertical systems.

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1994 Asymmetrical rolling and self-excited vibration in a ...

ROLLING MILL VIBRATIONS 1 1.1 Introductio 2 n 1.2 Torsiona 3 l chatter 1.2.1 Introductio 3 n 1.2.2 Torqu (TAF) 4 e amplification factor 1.2.3 Backlas 5 h 1.2.4 Torsiona in hot rolling 6 l vibration 1.2.5 Torsiona in cold rolling 14 l vibration 1.3 Vertica 16 l vibration 1.3.1 Introductio 16 n 1.3.2 Stri and damping 1p stiffness 6

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Cold Rolling - process overview - EngineeringClicks

Adjustment of the grain structure during the process Cold rolled metal properties. The result of cold rolling, i.e., increased hardness, is sometimes referred to as temper, but this is not to be confused with the heat treatment process known as tempering.. The amount of cold rolling that is performed on a sheet of metal determines the name given to the stock.

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Risk Assessment and Control Measures for Cold Rolling Mill ...

Cold rolling mill complex is equipped with the most . modern stainless steel production lines, sourced from leading manufacturers of the world. Coil build up line, bell anneal furnaces continuous annealing and pickling lines, sendzimer mills, skin pass mill, strip grinding line, slitting and

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Cold rolled sheet (roll) common defects,

Due to inclusions in the molten steel during steelmaking, or scratches, chisel marks, etc. on the surface of the steel strip during hot rolling, when cold rolling, a spot-like trace is formed on the surface of the steel strip. Rolling in dirt. The defects are blocky, generally white, and easy to concentrate on a certain length of the steel strip.

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