Mathematical Modelling of the High Frequency Vibrations During Cold Rolling Process

2013 ◽  
Vol 58 (4) ◽  
pp. 1085-1091 ◽  
Author(s):  
A. Światoniowski ◽  
O. Bar
Keyword(s):  
Cold Rolling ◽  
Mathematical Modelling ◽  
Process Parameters ◽  
High Frequency ◽  
Rolling Process ◽  
Metal Sheet ◽  
Continuous Rolling ◽  
Underlying Assumption ◽  
The Subject ◽  
High Frequency Vibrations

Abstract The study explores the model of high-frequency vibrations during the continuous rolling processes, the underlying assumption being that vibrations are self-excited. The effects of rolling stand and rolling process parameters on the nature and intensity of vibrations are investigated. The appearance of darkened streaks occurring on the metal sheet is explained. The results are compared with the data quoted in literature on the subject.

Research on Force Parameter and Deformation Mechanism in the Cold Rolling of Bearing Inner Ring

2011 ◽  
Vol 101-102 ◽  
pp. 534-537
Author(s):  
Bao Shou Sun ◽  
Liang Tao Qi ◽  
Xue Dao Shu
Keyword(s):  
Cold Rolling ◽  
Process Parameters ◽  
Deformation Mechanism ◽  
Rolling Force ◽  
Rolling Process ◽  
Ring Rolling ◽  
Force Parameter ◽  
Finite Element Software ◽  
Deep Groove ◽  
Deform 3D

In this paper, the simulation model of the cold rolling process of the deep groove bearing inner ring was established by using the finite element software Deform-3D. The numerical calculation of the model was made with different process parameters. The law of the influence the process parameters on the rolling force was analyzed. The deformation mechanism of the cold rolling process of the inner ring was revealed. The research indicated that the feed rate of idle roller had the greatest influence on the cold rolling process. Finally the experiment using the XS-50 precision CN ring rolling machine was carried on and a finished product of the inner ring of a better quality came out. It verified that the numerical simulation could provide theoretical basis for the practical production process.

scholarly journals Effect of gripping conditions and strip oscillations on vibrations originating at cold rolling

2020 ◽  
Vol 76 (1) ◽  
pp. 54-58
Author(s):  
A. V. Kozhevnikov
Keyword(s):  
Cold Rolling ◽  
Rolling Process ◽  
Rolling Speed ◽  
Continuous Rolling ◽  
Rolling Mills ◽  
Deformation Parameters ◽  
High Dynamic ◽  
Working Rollers ◽  
Rolling Mode ◽  
Strip Length

The process of continuous rolling is subjected to non-stationarity, accompanied by oscillations of not only basic technological and power parameters, but also parameters in the hearth of deformation. Non-stationarity at the rolling accounting high dynamic of the process results in origination of negative vibration effects. To prevent the vibrations originations the rolling speed is decreased, which prevents the reaching of the designing parameters of rolling mills operation. The study of influence of non-stationarity of the rolling technological process on gripping conditions and origination of dangerous oscillations was carried out. Characteristics of rolling mode of strip of 2.0–0.45 × 970 mm dimension, accompanied by vibration was presented, as well as graphs of the strip oscillations in the process of stationary rolling and under conditions of vibrations origination presented. An assumption made, that during vibrations origination the gripping conditions of the strip by rollers are disturbed. It means that provision of the grip stationarity will decrease the risk of the vibrations originating at the rolling. The assumption was confirmed by the studies of the cold rolling at five-stand mill 1700 of Cherepovets steel-works. The calculations of the hearth of deformation parameters were made by application of an elaborated dynamic model of the rolling process. The higher probability of vibrations originating at the rolling of strips of smaller thickness explained. It was shown, that due to the strip length, the rolling of the thinner metal is accomplished at higher speeds, comparing with the rolling of thicker metal. In addition, it was shown that the friction coefficient value at that would promote increase of risk of non-stationary rolling mode originating. The support of stable friction conditions in the hearth of deformation is promoted by usage of chrome-plated working rollers and asymmetrical rolling.

scholarly journals Dataset showing steel cold rolling process parameters for a 6-high cold rolling mill in Nigeria

Data in Brief ◽  
2018 ◽  
Vol 18 ◽  
pp. 891-901
Author(s):  
Emmanuel O. Ayuba ◽  
Christian.A. Bolu ◽  
Temitope M. John ◽  
Abiodun A. Abioye
Keyword(s):  
Cold Rolling ◽  
Process Parameters ◽  
Rolling Mill ◽  
Rolling Process ◽  
Cold Rolling Mill

SOME FEATURES OF ATMOSPHERIC EDDIES WITH APPLICATIONS TO THE VIBRATIONS OF TRANSMISSION LINES

1933 ◽  
Vol 8 (2) ◽  
pp. 105-113 ◽  
Author(s):  
W. E. Knowles Middleton
Keyword(s):  
Wind Velocity ◽  
Transmission Lines ◽  
High Frequency ◽  
Meteorological Conditions ◽  
Pressure Tube ◽  
Lapse Rate ◽  
Square Root ◽  
The Subject ◽  
High Frequency Vibrations ◽  
The Mean

Some conclusions regarding atmospheric eddies, derived from the records of a pressure-tube anemograph at St. Hubert Airport near Montreal, are applied to the problem of the vibrations of transmission lines, furnishing a meteorological approach to the problem recently discussed by C. D. Niven.It is found (1) that during glaze storms the wind at 60 ft. above ground is generally less gusty than the average; (2) that the mean duration of a gust varies inversely as the square root of the wind velocity, and is too large to resonate with the ordinarily observed period of "galloping"; and (3) that the steadiest winds invariably occur on nights of low wind velocity when a large negative lapse rate of temperature has been built up, leading to the small high-frequency vibrations due to eddies forming behind the cables.The meteorological conditions accompanying a recent destructive case of "galloping" form the subject of part of the paper.

scholarly journals Edge-Drop Control Behavior for Silicon Strip Cold Rolling with a Sendzimir Mill

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 783 ◽  
Author(s):  
Hongbo Li ◽  
Zhenwei Zhao ◽  
Dawei Dong ◽  
Guomin Han ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Cold Rolling ◽  
Process Parameters ◽  
Work Roll ◽  
Rolling Process ◽  
Transverse Flow ◽  
Control Behavior ◽  
Strip Profile ◽  
Sendzimir Mill ◽  
Edge Drop

Edge-drop control is important for silicon strip cold rolling, as the silicon strip is mainly used as a laminated core. Moreover, cold rolling is the key process for the thin strip edge-drop control, and a Sendzimir mill is one of the most popular cold rolling mills for silicon strips. Thus, the mastery of edge-drop control behavior for silicon strip cold rolling with a Sendzimir mill is beneficial for the improvement of the strip profile quality. With the finite element method, two models are built to analyze the edge-drop control behavior, one is the roll system and strip integrated elastic-plastic deformation statics model, and the other is the strip plastic deformation dynamics model. The first model provides the roll gap contour for the second model, then the strip profile can be calculated in the second model, which considers the transverse flow of the metal. Firstly, the compositions of edge-drop for the silicon strip are analyzed systematically, which are the edge-drop for work roll bending, the edge-drop for work roll flattening, and the edge-drop for transverse flow of the metal. Secondly, the influence of different rolling process parameters on the three parts are analyzed, such as the entrance thickness, the rolling reduction, the rolling tension, and so on; further, the influence of the roll contours are also analyzed. Finally, the edge-drop control behavior of the different rolling process parameters and roll contours are obtained. The research results provide theoretical guidance for edge drop control in the Sendzimir mill.

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