Jun , 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 PriceWhat Can I Do For You?
Hello! If you are interested in our products and leave your needs, we will reply to you in time!
Get Price
We will strictly protect the privacy of users'personal information and never disclose it.
Mill vibration during cold rolling february 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
And hz, is a selfexcited vibration phenomena typically occurring in the rear stands of tandem cold mills it can produce significant gauge variations and even cause strip breaks rd octave mill chatter is characterized by a quickly diverging vertical vibration of the rolls for specific rolling conditions material, mill speed, forces,
Get Price
Aug , mill vibrations chatter especially occurring at high rolling speeds affect product quality of the coldrolled material and thus lead to yield losses and quality issues among other supportive measures active chatter damping has turned out to be an effective approach to counteract these problems by significantly reducing vibration issues of
Get Price
vibration measurement of the rolling mill the cold rolling process is usually conducted with a workpiece that is initially at room temperature a schematic illustration of the high cold rolling mill is shown in fig the stands are arranged to produce a sequential reduction in the thickness of the strip work rolls are the tools
Get Price
Mar , models for the occurrence of the vibrational instability during rolling known as third octave chatter are presented and discussed an analysis of rolling mill chatter was performed for the purpose of identifying characteristics of the vibrations and to determine any dependency on the rolling
Get Price
The cold rolling process is a high speed, transient, and timerelated 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
Get Price
In this paper, we propose an effective mechanicalelectricalhydraulicinterfacial 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
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
Jan , 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 labourintensive process, but the improved mechanical properties increase the value of the finished product, whether that is a sheet, strip, or coil
Get Price
Oct , based on vibration problems of a six roller cold rolling mill, hydraulicmachinery coupling vibration system dynamic model of the mm stand tandem cold rolling mills
Get Price
The rolling process is shown in fig rolling is done both hot and cold it is accomplishes in rolling mills a rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc rollers may be plain or grooved depends upon the shape of rolled product
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 such as a low frequency torsional vibration hz which is associated with drive train and small thickness
Get Price
In the present paper rolling mill is considered as this rolling mill is older therefore defects such as a looseness of fasteners and belts, b misalignment of parts, c wear out of the components such as gear teeth, bushes, couplings and bearings are observed during inspection, which
Get Price
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 be nealy hz
Get Price
The cold rolling process is a high speed, transient, and timerelated 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
Vibration types the complex nature of a five stand cold mill prevents the discussion of all steps performed to date to improve performance we will discuss three basic types we encountered as we began to increase mill speeds rumble, third octave and fifth octave rumble vibration occurring near hz was encountered during acceleration
Get Price
Elastoplastic deformation during cold rolling and its surface quality model description in order to reveal the mechanism of defects occurrence on the surface of steel cold rolled strips during work rolls vibration, the finite element method implemented in the deformd program was used the th stand of the stand mill of pao severstal
Get Price
Mar , the influence of hydraulic agc system is often ignored when the vertical vibration of rolling mill is analyzed , h xu, l l cui, and d g shang, a study of nonlinear coupling dynamic characteristics of the cold rolling mill system under different rolling parameters, advances in mechanical engineering ,
Get Price
The analyzed rolling mill has six rolls able to roll steel strip coming directly from hot rolling mill train the purpose of the present work is to identify the reason of the excitation in order to limit the problem a solution based on empirical observations, vibration analysis and considerations of a model is proposed
Get Price
Jan , 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
Fig , heat migration in cold mill work rolls hotter regions shown in red this localized heat input output process results in a nonuniform distribution of heat, circumferentially around the roll and transversely across the roll body additionally the roll is subjected to thermal and mechanical fatigue during rolling
Get Price
Oils, soap emulsions, fatty acids are used as lubricants during hot rolling nonferrous metals mineral oils, paraffin, fatty acids are used for cold rolling normally, foe ferrous alloys no lubricant is used rolling mill control production of continuous sheets and strips is one of the attractive features of modern rolling mills
Get Price
Rolling mills are not a standard machine tool, nor are they built for stock they are designed and builttoorder to specifically accomplish an end product or process at one point during the industrial revolution in america, the united states led the world in hot and cold rolling, plate mills, slabbing mills and blooming mills
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 hotrolled 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 PriceMany 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 longterm 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 machine,it
Get Price
On account of the selfexcited vibration in no stand of cold rolling mill, the relationship between rolling lubrications and selfexcited vibration of rolling mill was theoretically studied the selfexcited vibration in no stand of the mill was restrained by optimizing the lubrication technical parameters, and the critical stabilized rolling speed was increased from mmin to
Get Price
Mixer electric hammer mill rock gold ore beneficiation equipment for chrome ore in brazil mill ballast gold ore in r ce approved single phase concrete grinding machine single toggle jaw crusher tightening wedge for sale used in cement ball mill operasi mesin feed mill mobile static and crushing machine and screening products
Get Price
vibration measurement of the rolling mill the cold rolling process is usually conducted with a workpiece that is initially at room temperature a schematic illustration of the high cold rolling mill is shown in fig the stands are arranged to produce a sequential reduction in the thickness of the strip work rolls are the tools
Get Price
Jun , 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
Most important parts of cold rolling mills this phenomenon causes severe damage for the mill machine and strip quality fig fig strip faults, due to rolling mill vibration the integrated control process is made to analyse the vibrations which are produced
Get Price
Mar , models for the occurrence of the vibrational instability during rolling known as third octave chatter are presented and discussed an analysis of rolling mill chatter was performed for the purpose of identifying characteristics of the vibrations and to determine any dependency on the rolling
Get Price
Oct , since vibrations mainly occur at higher speeds, in most cases the rolling speed of single or multistand mills for steel and aluminum has to be limited the most critical vibration issues when running cold rolling mills are the rd octave chatter hz hz and the
Get PriceYou can follow the news below to learn more
