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During the hot rolling industrial production process, strip width narrowing is the main quality problem of product. In this paper, it is obtained through experimental analysis that incoming material temperature, roll eccentricity and the control accuracy of looper equipment are the three main factors leading to strip width narrowing in the hot …
Roll eccentricities are the result of various factors that include non-uniform thermal expansion of the rolls, grinding inaccuracy or asymmetrical adjustment of the bearing roll shells via drive keys with the …
Roll eccentricity is an important factor causing thickness variations during hot strip rolling and might define the limit of strip thickness control accuracy. An improved multi-resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in both …
The key equipme nt in hot/cold tand em rolling mills is the finishing mill g roup, which usually consists o f 7 mill stands in hot rolling and 5 mill stands in cold rolling.
thickness, roll gap, and rolling force can be expressed by spring equation Eq. (1): M F h S 0 0 (1) where S 0 is unloaded roll gap; F 0 is rolling force; M is the mill stiffness or mill modulus. The strip thickness reference has to be created first during the lock-on process by
A performance indicator based on product expectations or the empirical value of quality-related process variables, which can be quantitatively visualized with four zones, is proposed in the high level of parameter estimation and online monitoring of roll eccentricity in rolling mills. This paper deals with the parameter estimation and online monitoring of …
The coupled pickling line and tandem cold mill (PL-TCM) using Universal Crown Control Mill (UC-MILL) has become a de facto standard for large-scale prodcution of high-quality strip. Main benefits: Highest production rates (1.2-2 million t/a) with optimized yield. Tight tolerances for strip thickness and flatness with uniform high-quality surface.
Maanshan Iron & Steel Co., China. Type of plant: Reversing cold mill for silicon steel production. Technical data: Mill type: HYPER UC-Mill. Strip thickness: 0.35 ~ 0.65 mm. Strip width: 900 mm ~ 1,280 mm. Our solution: The installation of a Hyper UC-MILL enabled the customer to produce high-grade silicon products.
Hot rolling mill thus helps in reducing the size of a metal thereby molding it into the desired form and shape. Rolling mills perform the function to reform the metal pieces such as billet and ingot whilst maintaining its well equipped micro structure into bar, wire, sheet, strip, and plate. ... Definition and Causes of Roll Eccentricity Design ...
1 Introduction. Aluminium cold rolling is a rolling process to reduce the thickness with a further objective of improving the strength, surface finish and formability of the stock by conducting the process of rolling at the room temperature [].Aluminium alloys can be cold rolled down to thickness of around 0.05 mm. Pure (low-alloy) aluminium can …
These studies had concentrated to improve the mill stretch design and the rolling speed control in order to accomplish fine thickness with respect to the compensation of the roll eccentricity and ...
These studies had concentrated to improve the mill stretch design and the rolling speed control in order to accomplish fine thickness with respect to the compensation of the roll eccentricity and ...
The hot rolling technology is the most widely used method of shaping metals and is particularly important in the manufacture of steel for use in construction and other industries. In metalworking, rolling is a metal forming process in which metal stock is passed through a pair of rolls. Rolling is classified according to the temperature of the …
This study seeks to improve the strip thickness accuracy by adding filter and compensator in strip rolling mills. Based on wavelet packet de-noising theory, this paper designed a wavelet packet analyzer of roll eccentricity (WPARE) to eliminate noises and useless frequencies in rolling force signal. By combining WPARE with a compensator, …
No.98CH36242) 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.
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.
ISBN: 9788190568586. Code: NI147. Pages: 656. Price: Rs. 1,575.00 US$ 150.00. Publisher: NIIR PROJECT CONSULTANCY SERVICES. Usually ships within 5 days. The hot rolling technology is the most widely used method of shaping metals and is particularly important in. the manufacture of steel for use in construction and other industries. In ...
This study seeks to improve the strip thickness accuracy by adding filter and compensator in strip rolling mills. Based on wavelet packet de-noising theory, this paper …
A vibration monitoring method of strip rolling mill based on the digital twin model was proposed which could effectively reduce the structure complexity and test cost of the traditional monitoring system. Firstly, the coupling vibration mechanism model of the dynamic characteristics of roll system and bearings of four-high mill was established. …
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 …
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. The increasing demands on the thickness …
Sources of chatter in rolling mill Table 1: Chatters reasons. ... (Radial loads, when applied to bearings through roll bending or unbalance or eccentricity of the rolls). 18 Inter-stand coupling 19 Chatter-affected strip entering the mill stand 20 ... Hot rolled coil after welding, notching and punching.
load cell hydraulic Keywords- rolling mill control; tandem hot metal rolling; multi- Figure 2. ... Compensation of Eccentricity Cyclic variations in the strip thickness can be caused by roll eccentricity which is an axial deviation between the roll barrel uop controller and the roll neck caused by irregularities in the mill rolls, in the + roll ...
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.
2.1 Dynamic Model. The rolling mill drive system mainly consists of the motor, reducer, main shaft, speed divider, arc gear shaft, work roll and bearings at corresponding parts [].The torsional vibration is often closely related to the dynamic energy transformation process of the rolling interface, which causes the relative speed between …
In Kugi et al., 2 an active compensation of the roll-eccentricity-induced periodic disturbances has been done for the strip exit thickness of hot and cold rolling mills. The factorization approach ...
Advantages arising from the design are suitability for hot and cold 4-high rolling mills, with or without pulse generators on the undriven backup rolls, and modest computational requirements. ... Consequent ly. sources of measured centre;ine thickness of strip emergingthickness variation. such as roll eccentricity. from a 4-high rolling mill ...
Rolls in rolling mills are never completely round but have eccentricity which can be caused by: grinding inaccuracy non-uniform thermal expansion asymmetrical adjustment …
Product thickness: min.0.1 mm. Width range: 1,000mm～2,150 mm. Max Rolling Speed: 2,000 m/min. Our Solution: The application of the Universal Cold Mill (UCM) principle and coolant spray zone control delivered excellent shape control, and made high-speed rolling of thin gauge possible. Innovative design & technology enables high-precision ...
Roll eccentricity is not a stationary signal. Its frequency and amplitude might vary with the change of rolling speed and with the thermal expansion of the rolls. Typically, roll eccentricity affects the measured strip thickness of a six-stand hot rolling mill ranging from 25 f-lm to 50 f-lm.
The validation results demonstrate that the eccentricity influence of 1st stand is more serious and that of 5th mill is second in 5 stand tandem cold rolling mill, further more the effects of skid ...
– 99 – P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvement Figure 6 Effect of roll eccentricity on output strip thickness Figure 7 Thickness control loop with eccentricity thickness deviation as …
Author: NIIR Board of Consultants & Engineers Format: Paperback ISBN: 9788190568586 Code: NI147 Pages: 656 Price: Rs. 1,575.00 US$ 150.00 Publisher: NIIR PROJECT CONSULTANCY SERVICES Usually ships within 5 days. The hot rolling technology is the most widely used method of shaping metals and is particularly important in the …
Meeting Demand: Electrical Steel and E-mobility. Cold rolling technologies that work to maximize output while maintaining and improving the quality of electrical steel grades are vital to meet increasing demands. ISSUE #12 (FEB 23) …
1342 IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 34, NO. 6, NOVEMBER/DECEMBER 1998 A Novel Real-Time Fuzzy-Based Diagnostic System of Roll Eccentricity Influence in Finishing Hot Strip Mills Daniel F. Garc´ıa, Jos´e M. L´opez, Francisco J. Su´arez, Javier Garc´ıa, Faustino Obeso, and Juan A. Gonz´alez …
The roll eccentricity can be observed in various rolling mills for plates and strips, and it is a dominant factor affecting the quality of finished strip steels in modern high- precision and high-speed cold-rolling strip steel production.
