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The tandem cold mill vibration known as chatter or rumble is a rolling phenomenon occurring in mills throughout the world it affects the very cornerstones of an operation; quality and product .
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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 .Get Price
During the cold rolling of thin metal sheets undesired mechanical vibrations generally referred to as chatter are often generated it usually lowers the surface finish of the sheet and in some cases causes gauge variation it may also cause severe damage to the rolling mill .Get Price
Variation due to roll vibration friction and cooling during process according to the frequency of vibrations generally there are three kind of vibration consider during cold roll forming which may influences chatter marks 4 such as: a low frequency torsional vibration (5-20hz) which is associated with drive train and small thickness .Get Price
Aug 14 2018 in cold rolling mills vibrations of mechanical parts andor strip can interfere with several quality parameters like thickness shape surface quality and others since vibrations occur at higher speeds in most of the cases rolling speed of single- or multi-stand mills for steel and aluminium has to be limited quite often.Get Price
Since vibrations mainly occur at higher speeds in most cases the rolling speed of single- or multi-stand mills for steel and aluminum has to be limited the most critical vibration issues when running cold rolling mills are the 3 rd octave chatter (100 hz 160 hz) and the 5 th octave chatter ( 440 hz).Get Price
The same time the increased running speed brings out possible vibration problems in the rolling process especially in a cold strip mill if the thickness variation of the hot-rolled aluminum strip can be reduced it will be possible to increase the production speed of the cold strip mill these claims set new demands on the acceptable rolling.Get Price
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.Get Price
Jan 21 2019 cold rolling is a process that occurs after hot rolling in order to reduce the thickness increase the yield and tensile strength and pliability of metal it is a relatively expensive and labour-intensive process but the improved mechanical properties increase the value of the finished product whether that is a sheet strip or coil.Get Price
Most important parts of cold rolling mills this phenomenon causes severe damage for the mill machine and strip quality (fig 1) fig 1 strip faults due to rolling mill vibration the integrated control process is made to analyse the vibrations which are produced .Get Price
Many researchers think that rolling mill vibration is a kind of self-excited vibration tlusty et al proposed a basic theory of chatter in cold rolling based on the influence of the variable strip tension on the rolling force and on the variations in contact length.Get Price
Jun 13 2019 cold rolling mills show a complex vibration behavior consisting of natural vibrations of the plant mechanics as well as excitations from the drive or bearings but also vibrations caused by defects the aim of the monitoring is to detect vibrations that are caused by external excitation or faults.Get Price
Apr 27 2020 a typical 6-hi cold mill for aluminum during pre-assembly in minos workshop in alessandria italy additionally the mill will be equipped with advanced sensors and monitoring systems such as bearings temperature control strip temperature control vibration monitoring and control system and edge cracking detection.Get Price
Sep 09 2015 in this paper the chattering phenomenon in cold rolling is investigated in reference to the finite element method (fem) the structure of the mill stand is modeled as a system of linear springs and lumped masses while the rolling process is modeled utilizing an implicit fem.Get Price
On account of the self-excited vibration in no 5 stand of 1420 cold rolling mill the relationship between rolling lubrications and self-excited vibration of rolling mill was theoretically studied the self-excited vibration in no5 stand of the mill was restrained by optimizing the lubrication technical parameters and the critical stabilized rolling speed was increased from650 mmin to .Get Price
Many customer will only use cold rolling mill but forget to make routine maintenance of cold rolling mill equipment during usage process so for life and long-term operating efficiency of the cold rolling mill it does not do any goodmaintenance of cold rolling mill is related to production quality and equipment life so during the repair and maintenance work of cold rolled ribbed machineit .Get Price
Mill vibration phenomena during cold rolling innoval the simplest type of mill vibration is found in all mills it is a forced vibration due to roll eccentricity and so occurs at roll rotation frequencies these frequencies are usually lower than any of the resonant frequencies of the mill stand.Get Price
Nov 08 2016 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.Get Price
However there are several types of rolling mill vibration that can have a significant impact on the quality andor productivity of the cold rolling process the two common forms of rolling mill vibration that are most difficult to solve are third octave gauge chatter and fifth octave chatter.Get Price
The angular and radial backlashes due to intensive wear are the most distinctive feature of the cold and hot rolling mills drive trains it causes nonlinear torsional vibration and significant torque amplification it leads to equipment failures but it could be used for wear diagnostics in the range of natural frequencies of the drive trains during the transient processes.Get Price
Nov 01 2020 the mill vibration data was collected from the ucm cold rolling plant it was believed that mill chatter during cold rolling is due to abnormal periodic oscillations of the rolls in the vertical direction heidari et al used an accelerometer located at the top of the stand to detect the vertical movement of the rolling mill.Get Price
Sep 08 2016 rolling mill vibration is a technical problem in the iron and steel industry for many years and has serious impact and harm on production there were serious vibrations in the middle mills when rolling thin container strip for the compact strip production (csp) strip hot rolling process this paper studied the hysteretic characteristic of rolled strip and established the vertical vibration .Get Price
Innoval technology limited page 1 mill vibration during cold rolling tom farley innoval technology flaking roller mill polyfloc bcfa liminggroupcom flaking roller mill polyfloc bcfa for highest throughputs in a compact space.Get Price
Consistently during rolling for steel the desired temperature for rolling is around 1200c (2200f) the heating operation is called soaking and the furnaces in which it is carried out are called soaking pits from soaking the ingot is moved to the rolling mill where it is rolled into one of three.Get Price
Oct 10 2020 based on vibration problems of a six roller cold rolling mill hydraulic-machinery coupling vibration system dynamic model of the 2180mm 4-stand tandem cold rolling mills .Get Price
Mill finishing stands and remains so as it runs through the cold mill where high-speed rotating rollers form the strip one com-mon but serious problem that often shows up in a roller stand is a vibration that causes it to lose its ability to maintain critical thickness accuracy of the steel coil potential solution.Get Price
Jan 20 2015 the torsional vibration often occurs during the rolling process which will affect the production equipment based on electromagnetic field theory the air gap magnetic field energy of salient pole synchronous motor was given and the expression of electromagnetic torque was derived using the energy analysis method.Get Price
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.Get Price
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 .Get Price
The cold rolling process is a high speed transient and time-related metal machining molding process 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 factors such as various rolling processes equipment and .Get Price
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 .Get Price
Cold rolling plays a crucial role in flat steel production in recent years it has become extremely difficult to ignore the existence of chatter also called ghost vibration by operators who work in milling plants which restricts the quality and efficiency of strip productionfig 1 shows the layout of a tandem cold rolling process mill vibration often occurs in stand 4 and 5 .Get Price
Zheng et al (2017) 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.Get Price