Metals 2021, 11, 170 4 of 24 Figure 2. Structure diagram of a four-high hot rolling mill. 2.1. Piecewise Nonlinear Spring Force Model The hydraulic elastic stiffness refers to the nonlinear ...
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In addition, a rolling mill structure model is established by considering the structure gap and a piecewise nonlinear horizontal-vertical-torsional vibration model of the rolling mill is ...
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An effective dynamic model is the basis for studying rolling mill vibration. Through analyzing characteristics of different types of vibration, a coupling vibration structure model is established ...
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In this paper, a dynamic increment model for chatter in a Universal Crown Control mill (UCM mill) is proposed with the considering of strip hardening, elastic …
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Rolling mill vibration is a coupling vibration among mechanical, electrical, hydraulic, and rolling interfacial ... the structure of the mill is considered a rigid body; (5) the upper back roll ...
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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 …
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For KOCKS mill, dynamic characteristics of roll system are the main factors influencing the quality of rolled products. In this paper, the rigid-flexible-coupling virtual prototype of roll system is established. Under the limit condition of rolling 25 mm-40Cr bar, dynamic analysis on whole rolling process including idling, biting steel, steady rolling …
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It is shown that last-generation hybrid and double hybrid functionals in conjunction with partially augmented double- and triple-zeta basis sets can offer, in the framework of second order vibrational perturbation theory, a general, robust, and user-friendly tool with unprecedented accuracy for medium-size semi-rigid molecules.
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Based on the Orowan unit pressure differential equation, a vertical-horizontal dynamic rolling force model of workpiece was studied. Then, considering the influence of the rolling mill structure, the vertical-horizontal coupling vibration dynamic model of mill rollers was estabilished. The parse approximation solution of coupling system were …
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It is found that the natural frequency of the second order vertical vibration of the rolling mill is about 80 Hz. In its main vibration mode, six rollers vibrate inversely with the hydraulic cylinder block, as shown in Fig. 9. This is the ultimate cause of mill vibration, but it's hard to change because the mill structure has been determined.
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Johnson and Qi assumed that the rolling mill structure is symmetrical along the rolling line and therefore the rolling mill can be simplified to a single-degree-of-freedom vibration model. Shi et al. [ 8 ] established a parametric vibration model with the dynamic change in the inclination of a rolling mill drive system and analyzed the ...
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The frequencies at which free vibration occur are called natural frequencies. This has one natural frequency, whereas a complex structure such as a paper machine will have many natural frequencies. The motion that a structure undergoes will be different for each natural frequency; the higher the natural frequency, the more complex …
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Based on the symmetry of the mill structure can be divided into symmetric vibration model and asymmetric vibration model. The asymmetry of the mill structure is …
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The total vibration, which is the sum of the two vibrations above is as follows: (3) X = X 1 + X 2 = asin (ω 1 t) + bsin (ω 2 t) Any vibration can be shown as a series of sine functions with the circular frequencies (i.e., ω 1, ω 2) are referred to as the harmonics of the primary frequency ω. The equation is also known as a Fourier Series.
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Download scientific diagram | Schematic diagram of mill structure. from publication: Active vibration suppression for rolling mills vibration based on extended state observer and parameter ...
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In addition, a rolling mill structure model is established by considering the structure gap and a piecewise nonlinear horizontal-vertical-torsional vibration model of the rolling mill is ...
WhatsApp: +86 18221755073
eccentric vibrating mill is used for fibre-free micro-com-minution of asbestos waste. When asbestos is micro-comminuted with the eccentric vibrating mill, complete destruction of …
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As the core control system of a rolling mill, the hydraulic automatic gauge control (HAGC) system is key to ensuring a rolling process with high speed, high precision and high reliability. However, a HAGC system is typically a mechanical-electric-hydraulic coupling system with nonlinear characteristics. The vertical vibration of the load easily …
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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 …
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2. Understanding criteria for the vibration design of sensitive environments; 3. Refresher on dynamics of structural systems; 4. Understanding of the significance of the vibration path and how strategic siting and layouts can reduce the cost of vibration control; and, 5. Identify some of the implications of vibration control on structural design .
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Mill vibration monitoring system for cold rolling mills. Fig. 1 shown the layout of the experimental universal crown control mill (UCM) cold rolling line. It consisted of five 6-high rolling mills. The structure of a single stand in the UCM was shown in Fig. 2. The mill vibration data was collected from the UCM cold rolling plant.
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Considering the nonlinear stiffness constraint action from the hydraulic cylinder in the four-high rolling mill process, the vertical vibration dynamic model with …
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Rolling mill vibration not only affects rolling production quality and rolling speed, but also causes damage to rolling equipment and even more serious economic …
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Download scientific diagram | Structure of 1780 hot rolling mill. from publication: Coupled Vibration Behavior of Hot Rolling Mill Rolls under Multinonlinear Effects | A coupled vibration model of ...
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Vibration mill structure diagram. RETRACTED ARTICLE. 1040 The Open Automation and Control Systems Journal, 2015, Volume 7 Xiaolan et al. 3. DESIGN OF THE TWO PENDULUMS VIBRATION EXCITER IN NEW VIBRATION MILL. To make the grinding cylinder could produce transient high vibration intensity continuously; the pendulum …
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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. …
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Vibration Mill for Efficient Sample Preparation, Suitable for Crushing and Grinding a Variety of Materials with Analytical Precision. ... It can also produce particles with varying shapes, sizes, and structures, making it adaptable to diverse industrial needs. High Processing Capacity: With a filling capacity of up to 80% in the grinding ...
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Vibration mill is a device using the principle of vibration. It can effectively conduct fine grinding and super fine grinding. It is consisted of upper mass, lower mass, vibration …
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