Cold rolled sheet (roll) common defects, characteristics ...

Apr 17, 2019· 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 …

Chatter in Cold Rolling - ScienceDirect

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.

Model for the solution of metal rolling mill vibration ...

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 process.

Analysis of Vibration for Sendzimir Mill in Cold Rolling ...

May 29, 2009· 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. Two distinct vibration modes were found to …

Dynamic control of lubrication characteristics in high ...

Mar 01, 2016· Vibration stability in the rolling mill was investigated based on a self-excited vibration model. In a tandem cold rolling mill, the balance of the friction coefficients between the neighboring stands has a great effect on vibration stability. Therefore, it is important to control the …

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

4-1993, "Vibration Analysis of a Hot roughing Mill during Asymmetrical Rolling", 2nd Asian-Pacific Conference on Computational Mechanics, Sydney. 5-1993, "Mechanical properties of Hot Steel", 13 th Australasian Conference on the

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

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 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 stand.

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. …

Aluminium rolling - Innoval Technology : Innoval Technology

Mill Vibration Phenomena during Cold Rolling. Roll and Strip Chatter Marks; 5th octave chatter. A brief history of metal rolling for sheet and plate products. Flatness measurement challenges. Industry 4.0: where is the revolution? part 1. Which type of levelling line is suitable for my product?

Chapter Cold-Rolling Mill Vibration and Its Impact on ...

This chapter describes the common types of mill vibration that can be experienced during the cold rolling of steel and aluminum. Two main problems are

THE STUDY OF INFLUENCE OF WORK ROLLS VIBRATION …

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 ...

Optimization of cold rolling process parameters in order ...

Statistical analysis of the rolling parameters during the vibration of the five-cell cold rolling mill was conducted by Makarov et al. [7]. Brusa and Lemma [8] analyzed the dynamic effects in ...

Tandem Strip Mill's Multi-parameter Coupling Dynamic ...

rolling mill torsional vibration nonlinear measurement model with consideration of roll slippage. The vibration phenomenona of a Baosteel 2030 tandem cold rolling mill were analyzed by ZOU and XU[4], who simplified the rolling mill into a six degrees of freedom mass-spring system. The model of high-frequency vibration during …

Dynamic analysis of vibration stability in tandem cold ...

Oct 01, 2019· Valigi et al. (2014) investigated the chatter marks and vibration phenomenon in a six-high cold rolling mill, and pointed out that the typical vibration frequency of the six-high cold rolling mill was still within the range of third-octave mode chatter. Recently, mill chatter has been recognized as the bottleneck in high speed rolling.

(PDF) Vertical Vibration Model for Unsteady Lubrication in ...

Vertical Vibration Model for Unsteady Lubrication in Rolls-Strip Interface of Cold Rolling Mills. Liza Horobets. Download with Google Download with Facebook. or. Create a free account to download. Download Full PDF Package. This paper. A short summary of this paper.

INFLUENCE OF THE STANDS CONSTRUCTION ON THE …

vibration. It was shown that strips, rolled in the LWM with the bearings stands, have not got any wavy surface. It was proved that during rolling in LWM the dangerous vibrations do not fall into the working space of the external loads, therefore construction of the new mill is good enough, in terms of strength at the vibrations.

(PDF) Stability Analysis of a Nonlinear Coupled Vibration ...

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 ...

Vibration-Based Condition Monitoring of Rolling Mill

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 are frequently occurred.

Experimental and Numerical Investigation of the Vibration ...

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.

Numerical Simulation and Parameter Design of Strip Cold ...

May 29, 2020· Gong et al. made a numerical simulation of the roll vibration during the cold rolling in 6-roll mill, and through the analysis of the results, it was considered that the vibration had the minimum value when the rolling speed was 25 m/s. With the further improvement of the flatness standard on the market, as the most mature high-precision cold ...

Dynamic analysis and control of strip mill vibration under ...

According to the "Hill rolling force formula", taking particular account of the influence from horizontal vibration of rolled piece in roll gap, a dynamic rolling force model is analyzed. Considering the interaction between vibration of strip and roll, the dynamic vibration model of rolling mill is established. On this basis, the time delayed feedback is introduced to control the vibration ...

(PDF) VIBRATION MONITORING OF TANDEM MILLS AT …

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 ...

Study on vibration characteristics of rolling mill based ...

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. Based on the main resonance singularity of the rolling mill system, the best combination of opening parameters was obtained.