Section snippets Equivalent dynamic model. The simplified structure of the CNC vertical milling machine spindle system is shown in Fig. 1, which is mainly composed of tool, pre-tightening nut, tool holder, shaft, synchronous toothed belt pulley and angular contact ball bearings.
Pareto Table for Pareto Diagram -Mill Vibration analysis ... Vertical roller mills, VRMs, are widely used for grinding raw materials in factories engaged in the extraction and processing of ...
This paper studies mathematical model of a Vertical Roller Mill (VRM). VRMs are widely used in cement, chemical, coal and electricity industries to reduce …
The vertical roller mill (VRM), including powder separation and crushing sub-systems, is used extensively for intermediate crushing of minerals in several industries such as cement, electric power, and chemical. Compression crushing is also the main crushing mechanism in the VRM, but there is also shear force between grinding roller …
In this paper, taking a model of the vertical vibration of a four-roller cold rolling mill under harmonic excitation as a prototype class for a real system, the effects …
Fig. 5, Fig. 6 show the amplitude frequency response curve of the strip mill roll system when the rolling parameters change. The analysis of the amplitude frequency response curve of the system can better grasp the vibration mechanism of the strip mill and provide a theoretical reference for restraining the vibration of the strip mill.
Request PDF | Analysis on parametrically excited nonlinear vertical vibration of roller system in rolling mills | A vertical nonlinear parametrically excited vibration model of 4-h rolling system ...
The vibration phenomenon of the rolling mill always exists during working. The vibration of the rolling mill not only reduces the quality of the products, but also damages the equipment in severe cases and even leads to huge economic losses [1, 2].In order to avoid the vibration of the rolling mill, a lot of research work has been carried …
Vibration Analysis of a Vertical Roller Mill: Modeling and... Dou, H. J., Chai, X. T., & Nie, W. H. (2011). Numerical study of the flow field in a vertical roller mill. In Applied... W.L. Du et al. Fault diagnosis expert system for large vertical mill with alarming judgement based on measured data.
Fig. 3 shows the steady-state amplitude responses of the vertical vibration model of a four-roller cold milling mill when the noise intensity η t = 0. It can be observed . Conclusions. In this paper, the stochastic response of a Gaussian white noise-induced vertical vibration model of a four-roller cold rolling mill with harmonic excitation is ...
In this paper, vibration characteristics of a Vertical Roller Mill (VRM) are studied by using physical parameters of an operating VRM. The mathematical model is …
DOI: 10.1016/J.ENGFAILANAL.2014.04.012 Corpus ID: 136653988; Vibration characteristic analysis of twenty-high rolling mill with local defect on roll surface based on the time-varying contact stiffness
Section snippets Assumptions and model description. Earlier modal analysis of the classical discrete-continuous model indicates that for vibrations with the second mode shape (for frequencies 120–150. Hz) the roller pairs (consisting of the working and backing rolls) behave as rigidly connected lump masses [1], and so a …
Rolling mill vibration is a worldwide problem, although it has been found that the mill structure defects are the main cause of vibration, but the inhibition measures are difficult to implement. So we discussed the rolling force parameters influence on rolling mill vibration and suppression measures from rolling technology in this article. The results …
It was a Vertical Roller Mill & is designed for rated capacity 215 TPH but its ... Analysis of pre-improve phase data Brain storming sessions & defining the problem statement ... Mill vibration Breakdowns Grinding bed thickness Dam Ring Table & Roller Liners
The modal superposition method was used to solve the vertical vibration equations for the rolls of a six-high rolling mill; thus, the natural frequencies and modal …
The Geometry model of roll gap, the unsteady lubrication model of roller-strip working interface, the distribution model of normal rolling stress and friction stress, and the rolling vertical structure model were taken into account. ... which is not quite suitable in the analysis of mill vertical vibration, that is, parameter sensitive dynamic ...
This study establishes a vertical–horizontal coupling vibration model of hot rolling mill rolls under multi-piecewise nonlinear constraints considering the piecewise nonlinear spring force and …
The paper includes the analysis of the influence of the parameters of the rolling stand, strip and the rolling process on the intensity of vibrations being excited and …
A vibration monitoring method of strip rolling mill based on the digital twin model was proposed which could effectively reduce the structure complexity and test cost of the traditional monitoring system. Firstly, the coupling vibration mechanism model of the dynamic characteristics of roll system and bearings of four-high mill was established. …
In this paper, vibration characteristics of a Vertical Roller Mill (VRM) are studied by using physical parameters of an operating VRM. The mathematical model is derived and simulated for a set of working parameters. Mechanical properties of the grinding material and the physical properties of the mechanical construction are used in …
DOI: 10.1016/J.YMSSP.2021.107970 Corpus ID: 236238143; The vibration analysis of the CNC vertical milling machine spindle system considering nonlinear and nonsmooth bearing restoring force
the vertical direction (V). Horizontal measurements typically show the most vibration due to the machine being more flexible in the horizontal plane. Also, imbalance is one of the most common machinery problems and imbalance produces a radial vibration, that is, part vertical and part horizontal. Because the machine is usually more
Grinding test results for zinc ore showed that it is possible to decrease the total grinding energy consumption from 20.11 to 11.40 kW h/t by using vertical roller mill instead of AG/SAG-ball mill circuit (van Drunick et al., 2010). In another test performed in the Loesche test centre in Germany, 22.9% in airflow-mode and 34.4% energy savings ...
This study establishes a vertical–horizontal coupling vibration model of hot rolling mill rolls under multi-piecewise nonlinear constraints considering the piecewise nonlinear spring force and piecewise nonlinear friction force constraints of the hydraulic cylinder in the vertical direction of the rolls, the piecewise stiffness constraints in the …
Lu X, Sun J, Song ZX, et al. Prediction and analysis of cold rolling mill vibration based on a data-driven method. Appl Soft Comput 2020; 96: 106706. Crossref. Google Scholar ... Ma JZ. Dynamical responses for a vertical vibration model of a four-roller cold rolling mill under combined stochastic and harmonic excitations. Probab Eng …
Download Citation | On Dec 1, 2023, Hongbin Zhang and others published Vertical nonlinear vibration analysis of cold rolling mill considering structural gap and dynamic rolling force | Find, read ...
A rolling mill driving system is a multiple degree of a freedom torsional vibration system [].The torsional vibration of a driving system causes the rolling speed to change dynamically, providing instability factors at rolling interface and impacting the strip quality [2, 3].Therefore, it is necessary to explore the torsional vibration caused by the …
In this paper, vibration characteristics of a Vertical Roller Mill (VRM) are studied by using physical parameters of an operating VRM. The mathematical model is derived and …
In the process of strip rolling, mill vibration induces vertical and horizontal displacements in the rolls and rolled parts, affecting the accuracy of the rolling analysis model. Constant changes occurred in the rolling zone between the upper and lower working rolls due to mill vibration, resulting in slight vertical and horizontal displacements of the …
The working principle and structure of low-vibration vertical roller mills and forces of key component were analyzed intelligently and based on the intelligent numeral calculations, the maximum stresses of three key components were much lower than the yield strength of materials and the rocker arm-roller system of the proposed low …
The vibration of the rolling mill affects the accuracy of products, which becomes one of the key factors. It can be divided into vertical vibration, 3, 14, 15 free transverse vibration, 16 ...
Vertical nonlinear vibration characteristics of the cold rolling mill are studied. •. Using the Magnus series to solve the vibration response and dynamical …
Keywords Vertical roller mill · Acoustic analysis · Multiresolution analysis · SAC-DM 1 Introduction The grinding process in a vertical roller mill basically con-sists of the pressure exerted by the rollers on the material against a table driven by a reduction system. The pres-sures associated with friction and shear forces due to the
This work concentrates on the energy consumption and grinding energy efficiency of a laboratory vertical roller mill (VRM) under various operating parameters. For design of experiments (DOE), the response surface method (RSM) was employed with the VRM experiments to systematically investigate the influence of operating parameters on …
The working principle and structure of low-vibration vertical roller mills and forces of key component were analyzed intelligently and based on the intelligent numeral calculations, the maximum stresses of three key components were much lower than the yield strength of materials and the rocker arm-roller system of the proposed low-Vibration Vertical mill …
