(PDF) VIBRATION MONITORING OF TANDEM MILLS AT THE …
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 ...
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 ...
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,
There are many reasons for the vibration of the rolling mill, Wu et al. studied the effects of different sizes defects on the surface of the work roll of the Sendzimir 20-high rolling mill on the ...
Milling Equipment: mill vibration during cold rolling - A class of machinery and equipment that can be used to meet the production requirements of coarse grinding, fine grinding and super fine grinding in the field of industrial grinding.The finished product can be controlled freely from 0 to 3000 mesh.If you want to learn about our products, please call or write mail consultation.
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 ...
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.
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 good.Maintenance 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 ...
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 ...
Nov 22, 2013· As a 5 to 6 micron finish is desirable during the final rolling or "skin pass" the work rolls are changed for the 'skin pass" operation. Typical regrinding time for work roll is 100 passes. The first step in cold rolling is alignment, during which the centre line of feed stock is aligned with the centre line of the mill.
A coupled vibration model of hot rolling mill rolls under multiple nonlinear effects is established by considering the nonlinear spring force produced by the hydraulic cylinder, the nonlinear friction between the work rolls, the dynamic variation of rolling force, and the effect of external excitation as well as according to the structural constraints of a four-high hot rolling mill in the ...
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 …
Jan 09, 2012· Statistical analysis of the rolling parameters during the vibration of the five-cell cold rolling mill was conducted by Makarov et al. . Brusa and Lemma analyzed the dynamic effects in compact cluster mills for cold rolling numerically and experimentally. Their research activity was aimed to assess an approach suitable to model the cold rolling ...
The vibration demolding of the crystallizer leads to slab thickness deviation in continuous casting processes. Therefore, in this paper, the dynamic model of the hot strip rolling mill vibration resulting from entry thickness deviation is proposed and its dynamic characteristics are studied. First, the dynamic model of vertical vibration in the hot strip rolling mill is established based on ...
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 …
In the context of on-line monitoring for the cold rolling mill process we study the vibration for the most important parts of the cold rolling mill equipment. When in work, the rolling mill, causes severe damage for the mill machine and has a negative influence on the strip quality (Fig. 1). When we talk about steel strip quality, we take
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.
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.
Mar 26, 2002· 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 …
Fig 2, Heat Migration in Cold Mill Work rolls (Hotter regions shown in red) This localized heat input / output process results in a non-uniform 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:
Mill Vibration Phenomena during Cold Rolling - Innoval . For large metal structures that are commonly stress relieved with vibration ring or reverse ring times (the time periods are the same whether the amplitude is growing or decaying) can be 20 40 seconds or longer. See Figure 2. Read More
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 …
In the context of on-line monitoring for the cold rolling mill process we study the vibration for the most important parts of the cold rolling mill equipment. When in work, the rolling mill, causes severe damage for the mill machine and has a negative influence on the strip quality (Fig. 1). When we talk about steel strip quality, we take