FAULT DIAGNOSIS OF ROLL SHAPE UNDER THE SPEED CHANGE …

difficult to detect faults of a roll by using the existing frequency analysis method if the speed of the roll is changing. In this study, a new diagnosis method for roll eccentricity

Hajime Kai Inventions, Patents and Patent Applications ...

Abstract: A rolling load signal is detected during a few rotations of a top and a bottom backup roll at different detection time points at which the top and bottom backup rolls are out of phase from each other and then are analyzed by Fourier analysis so as to detect the amplitudes and phases of the eccentricity of the top and bottom backup ...

Fault diagnosis of roll shape under the speed variation in ...

The roll eccentricity may be caused by different reasons, e.g., inexact roll grinding or nonuniform thermal expansion of the rolls. The increasing demands on the thickness tolerances require new ...

Takao Dobashi Inventions, Patents and Patent Applications ...

Abstract: An apparatus for detecting a roll eccentricity in a rolling mill includes mark pulse generators each provided for upper and lower rolls from which an eccentricity is to be detected, the mark pulse generator generating one pulse per one rotation of the roll, sampling pulse generators each provided for the upper and lower rolls for ...

Inside Power Station: Turbine Eccentricity

2016-03-09· Eccentricity is measured while the turbine is on slow roll (1 to 240 RPM below the speed at which the rotor becomes dynamic and rises in the bearing on the oil wedge) and requires special circuitry to detect the peak- to-peak motion of the shaft.

US3709009A - Method for detecting eccentricity and …

A method for detecting an eccentricity and phase angle (an angle formed between a predetermined point of a roll and a point at which the maximum eccentricity occurs) of a working or backing roll in a rolling mill without use of detectors directly attached to the peripheral surface of the roll is provided. The rolling pressure is sampled ...

US4038848A - Method and apparatus for controlling ...

A roll eccentricity control apparatus for use with an automatic gage control device of gage meter type for a rolling mill comprising rolls for rolling the material to be rolled, a hydraulic jack for providing the rolls with rolling pressure, a flow rate control valve and a valve control device for adjusting the roll gap by controlling the ...

Simulation and Analysis of Roller Eccentricity ...

Based on mufti-resolution decomposition of roll force signal by use of wavelets, eccentricity signals are separated from disturbances and noise,and self-optimization is employed to real-time control the roller eccentricity. The results show that the method is effective.

KB Results - STI Vibration Monitoring Inc. Online Store

Eccentricity is measured while the turbine is on slow roll (1 to 240 RPM below the speed at which the rotor becomes dynamic and rises in the bearing on the oil wedge) and requires special circuitry to detect the peak- to-peak motion of the shaft. This is accomplished using circuitry with long update times selectable between 20 seconds (> 3 RPM) and 2 minutes (<3 RPM).

Roll Eccentricity Phase Identification System - CORE

Abstract. Roll eccentricity is widespread in the strip mill, has cyclical impact on strip thickness, so disturbance compensation is required to improve the product quality. The key step of disturbance compensation is to obtain reliable roll eccentricity signal. Existing direct measurements of roll

An Eccentricity Analysis Method Under Time-Varying Roll ...

We propose an off-line method for detecting a faulty backup roll that generates eccentricity components when the feeding velocity, equivalently the angular velocity of roll, is not constant.

Tandem Cold Mill | Primetals Technologies

The Roll Eccentricity Compensator improves strip quality by eliminating thickness deviations caused by roll eccentricities. Getting strip thickness within narrow tolerances is particularly important to ensure a good strip quality. Thickness variations at mill exit come not only from the incoming strip gauge variations or from the forward slip effect from changes in strip tension, but also from ...

Roll Eccentricity Phase Identification System - Scientific.Net

Roll eccentricity is widespread in the strip mill, has cyclical impact on strip thickness, so disturbance compensation is required to improve the product quality.

Detection of Noncircularity and Eccentricity of a Rolling ...

A common objective in the web transport industry is to increase the velocity as much as possible. Some disturbances drastically limit this velocity. Time-varying eccentricity of the rolling winder is one of the major disturbances which affect the quality of the rolling winder. This unsuitable factor

Study on the Method of Angle Domain Analysis and Active ...

Study on the Method of Angle Domain Analysis and Active Compensation for Roll Eccentricity . Tao Liu . Hebei Provincial Key Laboratory of Heavy Machinery

Fault diagnosis of roll shape under the speed variation in ...

Especially, the defects in a work roll are critical to the quality of strip. It is especially difficult to detect faults of a roll by using the existing frequency analysis method if the speed of the roll is changing. In this study, a new diagnosis method for roll eccentricity under the roll speed changes was developed. The new method was induced from analyzing the rolling mechanism by using ...

Method and apparatus for the detection and correction of ...

1990-03-27· The invention provides a new apparatus for the detection, measurement and display of roll and roll bearing eccentricity in a rolling mill, and also an apparatus for correction of such eccentricities.

Detection of Noncircularity and Eccentricity of a Rolling ...

Time-varying eccentricity of the rolling winder is one of the major disturbances which affect the quality of the rolling winder. This unsuitable factor can lead to a web break for a high-speed ...

Apparatus for detecting eccentricity of roll in rolling ...

1988-08-09· An apparatus for detecting a roll eccentricity in a rolling mill includes mark pulse generators each provided for upper and lower rolls from which an eccentricity …

FAULT DIAGNOSIS OF ROLL SHAPE UNDER THE SPEED …

The metal processing system usually consists of various components such like motors, work rolls, backup rolls, idle rolls, sensors, etc. Even a simple fault in a single component in the system may cause a serious damage on the final product.

Online Eccentricity Monitoring Weihong Guo of Seamless ...

detect abnormal conditions in the cross-roll piercing mill. Using the image-based sensing technique, rich information about the hot piercing operation conditions can be extracted. With UT results available at the model training stage, the relationship between product quality and process information can be established through feature selection and statistical quality control methods. Hotelling ...

CPC Scheme - B21B ROLLING OF METAL

Methods or devices for measuring, {detecting or monitoring} specially adapted for metal-rolling mills, e.g. position detection, inspection of the product {(control devices or methods B21B 37/00)} [2017-08]

GEORG ultragrind Roll Grinding Machine - Linkas Steel

> Roll shape > Roundness, Eccentricity, Run out > Options for measuringofroughness, surface andhardness > Options for Roll Crack detecting systems Mountingpossibiltyforroll inspectionsystems Measuringarm madeofcarbonfiber. machine tool division AutomaticRoll qualitycontrolsystem–online Okt. 2015 Roll Grinding Machine 16 > Options for Roll Crack detecting systems > For roll surface and …

Reversing Cold Mill | Primetals Technologies

REVERSING COLD MILL Advanced reversing cold-mill technology from Primetals Technologies is an ideal solution for small- to medium-sized production capacities, or for the rolling of smaller order lots of special steel grades.

DETECTION OF NON-CIRCULARITY AND ECCENTRICITY OF A …

DETECTION OF NON-CIRCULARITY AND ECCENTRICITY OF A ROLLING WINDER BY ARTIFICIAL VISION Christophe DOIGNON Dominique KNITTEL Laboratoire des Sciences de l'Image, de l'Informatique et de la T el ed etection

Technological control for cold rolling processes - ABB Ltd

Technological control for cold rolling processes Rolling of flat metal products is a complex proc- ess where the quality of the product is influenced by various factors like incoming material, me-chanical and electrical equipment, lubrication, control strategies etc. The significant quality parameters are: material thickness, material shape and surface, and the homogeneity of stress ...

AISTech Paper Form Version 8 140221 - Steel Plantech

Back-up Roll eccentricity compensation function is provided for No. 1 stand as well. In order to realize various modes of automatic gauge control, laser type speed-meter is …

CGE Peterborough Patents - Peterborough Museum & …

CGE Peterborough Patents. To view more details about the patent, either click on the link in the "ID" column, or (if no link exists yet) cut and paste the ID number (i.e. "US2736829A") into the Google search bar at Google Patents.

What is eccentric movement - Answers.com

Eccentricity is the measurement of Rotor Bow at rotor slow roll which may be caused by any or a combination of . Fixed mechanical bow . Temporary thermal bow . Gravity bow In extreme cases of ...

Chatter Detect spec sheet - UNIVIB

Roll Eccentricity and Ovality As an option, the measurement and display of roll eccentricity and ovality is offered as an additional feature of the software. Vibration Analysis An option for single-channel vibration measurement and spectrum analysis is also available. An industry standard icp-type accelerometer with magnetic mount will be supplied along with the required signal conditioning ...