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
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
In this paper we propose an effective mechanical electrical hydraulic interfacial coupling vibration model for hot rolling mills and obtain a practical measure to relieve mill vibration First an experiment related to mill modulus control gain in automatic gauge control AGC is carried out during manufacturing Rolling mill vibration is observed to gradually be enhanced with increasing mill
Understand mill vibration issues such as 3rd octave gauge chatter and 5th octave roll/strip marking with our Rolling Mill Vibration Model In common with other rotating machines rolling mills are prone to many different vibrations during rolling and most do not cause a problem
Model correctness and validity are confirmed by an experimental observation of a 2021 cold rolling that is present during chatter As the work rolls vibrate the gap widens and
Sun Rise Mill placed an order with Danieli for the supply of mechanical technological and automation equipment for a new push pull pickling line and a 6 high cold rolling reversing mill The new push pull pickling line is designed to be extended to a final production of 600 000 t per year The heart of the supply will be the 6 high cold
Request PDF Chatter Marks and Vibration Analysis in a S6 High Cold Rolling Mill S6 high rolling mill is an advanced mode to work the steel it allows the use of very small work rolls laterally
19 01 2021· Considering the two kinds of nonlinear constraints of rolling mill hydraulic cylinder spring force and friction force the vibration model of rolling mill system is established The amplitude frequency response equations are obtained by using the average method Comparing the time history curves of vertical vibration displacement of rolling mill system under the nonlinear spring force and
Mill Vibration Phenomena during Cold Rolling Innoval 8/11/2021 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 Typically the most damaging vibrations involve a natural resonance of the machine which significantly increases the motion of critical components Rolling
The cold rolling process is a high speed transient and time related metal machining molding process [1] As cold rolling mill is a multimass and rotary motion object system the vibration as an implicit factor commonly exists in the course of its operation but it usually does not apparently present due to the conditional constraints of
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
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
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
· Simulation of the primary drive in a cold rolling mill permits the development of electromagnetic damping of loading and torsional vibrations Correction of the algorithms for the mill s automated control systems proves effective here
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
Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material After the grains deform during processing they recrystallize which maintains an equiaxed microstructure and prevents the metal from work starting material is usually large pieces of metal like semi finished casting products such as slabs blooms and billets
and 150Hz is a self excited vibration phenomena typically occurring in the rear stands of tandem cold mills It can produce significant gauge variations and even cause strip breaks 3rd octave mill chatter is characterized by a quickly diverging vertical vibration of the rolls for specific rolling conditions material mill speed forces
become more stringent However due to the abnormal mill vibration the quality and production of the strip have beenScholars have done plenty scientific works about vibration in cold rolling However the vibrationsignals during the
01 10 2021· Zheng et al 2021 established a spatial vibration model of a six high cold strip rolling mill based on multi body transfer matrix method and demonstrated the vibration characteristics of the mill Recently several attempts have been made to analyze chatter characteristics in tandem rolling mills especially the effect of friction on vibration
26 01 2021· 1994 Asymmetrical rolling and self excited vibration in a hot roughing mill There are many published works on torsional and vertical vibration of rolling mills especially for cold rolling In their simulations the vibrations were calculated with the Torsiona in cold rolling 14 l vibration Vertica 16 l vibration Get Price
ing cold rolling mills 2 030 and 1 700 [12 13] The maximal range of work roll vibration displacement was taken as 0 4 mm and vibration frequency was taken as 100 Hz 200 Hz and 300 Hz At the beginning of the rolling process a boundary condition was established at the front end of the strip for strip grip by rolls assem blies of the front end move in the direction of strip movement in
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 Typically the most damaging vibrations involve a natural resonance of the machine which significantly increases the
Abstract In this paper a two degree of freedom nonlinear vertical vibration equation of the cold rolling mill with the dynamic rolling force was established then the delay feedback control method was introduced into the equation to controlled the vertical vibration of the system
· The elastic deformation of rolling mill elements during the rolling process is important By knowing the displacement of rolls the optimum gap between the work rolls can be calculated In present research a vibration model with two degrees of freedom is proposed for a cold sheet rolling mill and the stiffness parameters of different mill elements are calculated
Mill Vibration During Cold Rolling 2021 10 15on wear is another issue stresses from hertzian pressure in 4 high cold mill back up rolls were measured years ago the results were never published but of high interest also maybe later k h schrder july 2021 k h schrder a basic understanding of the mechanics of rolling mill rolls file
ROLLING MILL VIBRATIONS 1 Introductio 2 n Torsiona 3 l chatter Introductio 3 n Torqu TAF 4 e amplification factor Backlas 5 h Torsiona in hot rolling 6 l vibration Torsiona in cold rolling 14 l vibration Vertica 16 l vibration Introductio 16 n Stri and damping 1p stiffness 6
Excessive machine vibration in one mill critical equipment failures in another and a need for improved mill operations in a third were producing costs ranging from US$ 200 000 to US$ 1 200 000 To solve each problem and contain these costs each mill turned to SKF a global supplier of products customer solutions and services incorporating rolling bearings seals mechatronics and
The torsional vibration model of main drive system for 6 high cold rolling mill was established Calculation formula of torque amplification factor TAF of main drive system was put forward when the clearance exists or not The TAF curve changing by the biting time of blank was drawn and whether torsional vibration could cause mechanical failure in weak link of main drive system was judged
Mill Vibration Phenomena during Cold Rolling Roll and Strip Chatter Marks; 5th octave chatter Productivity benefits of strip cooling A brief history of metal rolling for sheet and plate products Molten metal cleanliness when casting aluminium slabs the basics
cold rolled sheet formation unit and pointed out that the chat ter marks on the steel surface were closely related to self excited vibration of the temper mill
Copyright © Shibang Industry & Technology Group Co., Ltd. Online Chat | Contact Us | sitemap
