Abstract: This paper is concerned with the active compensation of the roll-eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. 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 methods for the active ...
Rolls in rolling mills are never completely round but have eccentricity which can be caused by: • grinding inaccuracy • non-uniform thermal expansion • asymmetrical adjustment of bearing rolls shell via drive keys Each eccentricity consists of a base frequency which is the rotary frequency of the roll and several harmonic frequencies.
ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Francis Wagner, Manager Rolling Mill Automation Hatch Associates Consultants, Inc., Buffalo, NY, USA ABSTRACT: The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the BISRA principle for gage control.
In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is used. Because of roll eccentricity in backup rolls, the exit thickness deviates periodically. In this paper, we design PI controller in outer loop for the strip exit thickness while PD controller is ...
Typically, the number of backup roll cycles is as shown in Table I. TABLE 1 TYPICAL BACKUP ROLL CYCLES FOR DIFFERENT MILL TYPES MILL TYPE srAND PRODUCT NUMBER OF THICKNESS BACKUP ROLL (mm) CYCLES/PRODUCT Tandem cold mill First 0.3 100-400 Tandem hot mill First 2.5 10-25 Last 2.5 50-200 Plate mill Last 10.0 1-6 A review of previously proposed ...
hot rolling mill roll eccentricity. Fault diagnosis of roll shape under the speed variation in hot rolling Sep 1 2006 Especially the defects in a work roll are critical to the quality of strip. In this study a new diagnosis method for roll eccentricity under the roll Title Fault diagnosis of roll shape under the speed variation in hot rolling mill
how to control eccentricity problem in hot rolling mill. Rolling Mill Tutorial Before continuing make sure you have read Chapter 5 Another control problem besides the continuous caster arising in the steel industry is the control of the exit steel thickness in a rolling mill The diagram below shows the layout of a rolling mill with thick steel going in one side and thin steel coming out the other
The mill stretch compensation and other disturbances during the rolling process are compensated and a rolling speed dependent, adaptive PI controller is developed to accomplish fine thickness control.
hot rolling mill roll eccentricity-xinhai global. An in-depth review of the roll eccentricity control design problem is provided which encompasses a number of recent, novel, design contributions and includes experimental results from two separate steel, tandem cold rolling mill installations.
Neural network for identification of roll eccentricity in rolling mills. Feb 16, 1999 ... The roll eccentricity in a rolling mill may define the limit of ... thus is subject of interest for the automation equipment in hot rolling mills as well as...
Hot Rolling Mill Roll Eccentricity We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment.
Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network Article (PDF Available) in Engineering 06(01):27-33 · January 2014 with 543 Reads
A Cold Rolling Mill rolls, in subsequent short passes(due to the relative thick material), coiled strip from a thickness of up to 8 mm (coming from Hot Rolling Mill) down to 0.2 mm; the mill is designed with high rolling force and power capability and efficient and fast coil handling to minimize the waiting time.
Abstract: This paper is concerned with the active compensation of the roll eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons, like e.g. inexact roll grinding or nonuniform thermal expansion of the rolls.
non-circular shape was ground on the rolls. The empirical research took place at a hot strip mill. As a result, the 3D ground non-circular geometry of the backup rolls considerably reduced the rolling force variation. Key words: non-circular grinding, rolling mill, backup roll, rolling force variation. 1. INTRODUCTION
hot rolling mill roll eccentricity . how to control eccentricity problem in hot rolling mill. ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED … ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Francis Wagner, Manager Rolling Mill Automation Hatch Associates Consultants, Inc., Buffalo, NY, USA ABSTRACT: The Force Feed Forward (FFF) System is the only hot strip mill …
The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.
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Method for detecting eccentricity and phase angle of working or backing roll in rolling mill US3793860A (en) * : : Westinghouse Electric Corp: System to compensate for roll eccentricity effects and/or to simulate a mill with variable stretch characteristics US3882705A (en) * :
FAULT DIAGNOSIS OF ROLL SHAPE UNDER THE SPEED CHANGE IN HOT ROLLING MILL Kee Hyun Shin, Chang Woo Lee*, Hyun Kyoo Kang*, Cheol Jae Park** Dept. of Mechanical and Aerospace Eng., Konkuk University, Seoul, Korea [email protected] *Dept. of Mechanical Eng., Konkuk University, Seoul, Korea [email protected], [email protected]
10/18/2017· Rolling is a metal forming process, in which stock of material is passed between one or more pairs of roller to reduce and maintain the uniform thickness. Rolling process is classified as hot ...
Roll eccentricity is not part of the controller but must be considered to be consistent with data reported from operating mills which . Figure 3. Effects of roll eccentricity on output strip thick- ness. usually includes its effects. The eccentricity components remaining in the mill exit thickness after compensation.