قائمة الطعام
This article examines ways of reducing the consumption of rolling-mill rolls, extending their service life, improving the use of existing rolls, and introducing new rolls. Among the methods that can improve roll use are moving rolls to different stands of hot-and cold-rolling mills and implementing a system to assemble sets of rolls for the mills. …
The vibration of the rolling mill has been a persistent issue affecting its safe and stable operation. To address the vibration problem in the F2 stand of a continuous rolling mill, this paper establishes a digital twin model of the rolling mill. Based on the digital twin model, a rolling mill virtual commissioning framework has been proposed to …
The entire set up is called a rolling mill stand. One or more number of rolling stands in combination with other necessary and related equipment to obtain finished rolled products from one or similar group of input materials is called a rolling mill or rolling plant. Rolling process can be classified based on various conditions/methods employed ...
Therefore, four-high rolling mill vibrations take place in six degree of freedom (DOF) leading to spatial behaviors involving vertical, horizontal, axial, torsional, cross and swinging vibration modes resulting in complex relative motions between the rolls. Two numerical methods, modified Riccati-transfer matrix method (Riccati-TMM) and finite ...
To develop an analytical method for spatial vibration analysis of rolling mill, a 250 mm (diameter of the roll) high-stiffness rolling mill (without housing) is taken as an object for analysis.As shown in Fig. 2, the upper and lower chocks are connected by two square columns and two rods with left and right threads.Connections between chocks …
Mandrel rolling mill refers to the tandem mill that covers the shell on the long mandrel, which is sequentially arranged by multiple stands, and the roll gaps of adjacent stands are staggered by 90°. ... The elongation coefficient of this rolling method is 7–15, which can be directly produced with an ingot. However, it has a low production ...
A new method is developed for quantifying the shape controllability of rolling mills for flat products. The method enables one to acquire a comprehensive and accurate assessment of shape control performance in such a way that both the adjusting range and the ability to bear undesirable rolling force fluctuations can be efficiently articulated, …
Rolling is a metal forming process in which the deformation takes place under the application of Compressive forces between the rollers. In …
Therefore, four-high rolling mill vibrations take place in six degree of freedom (DOF) leading to spatial behaviors involving vertical, horizontal, axial, torsional, cross and swinging vibration modes resulting in complex relative motions between the rolls. Two numerical methods, modified Riccati-transfer matrix method (Riccati-TMM) and …
An online roll separating force model for cold rolling mill by numerical integration method was developed by Chen et al. according to the load equilibrium equation and the boundary condition. A non-circular contact arc was obtained naturally as a part of the solution of the governing equation by Guo [ 12, 13 ] who proposed a semi-analytical ...
Ring rolling is an another method of rolling which is used to rolled rings of large bearings, turbines etc. In this process, two rollers (Main Roller and Idler Roller) are arranged as shown in figure and rotate in same direction to each other. The ring rotates due to rotation of roller and the rollers start move closer to each other.
The rolling mill model is established in the upper computer Matlab/Simulink software, and the lower computer S7-1500 series PLC realizes the control of the rolling mill model through the TIA Portal software. ... given a step signal with a displacement of 0.1 cm for the upper roll system, three different tuning methods of the PID parameters are ...
Did you know not all steelmaking rolling processes involve heating? You can opt for cold rolling too. Learn more about how cold rolling is done here.
What is a Rolling Mill? Rolling Mills – Types, Function, Material, Applications, Advantages & Disadvantages: – Rolling is a metal forming process in which metal stock is passed through one or more pairs …
The traditional mill chatter mechanism model cannot meet the monitoring and rapid diagnosis needs of the rolling process in the field. In this paper, a data-driven mill vibration analysis method ...
Roll deformation is an important part of profile and flatness control system. Computation speed and accuracy of roll deformation model is a research hotspot, which provides a precondition for online application. This paper puts for- ward a new roll deformation model of four high hot rolling mills based on improved influence function …
In conventional ring rolling mills, a signal of the main roll velocity is usually available, but it cannot be easily inferred to the rotation velocity of the ring. ... that the presented measurement method enables to track the ring position on an industrial radial-axial ring rolling mill. The measurement method is based on hall sensors which ...
Processing Methods Applicable to Thermoplastic Elastomers. Jiri George Drobny, in Handbook of Thermoplastic Elastomers (Second Edition), 2014. 4.2.3.1.1 Roll Mills. The roll mill is the simplest batch mixing equipment. The principal design consists of two horizontal rolls, usually of equal size, arranged side by side and rotating toward each …
An analysis is made of the processes used on a rolling mill at the Belarus Metallurgical Plant to subdivide slabs lengthwise in the production line. New schemes are proposed for the location of the rolls used for subdividing slabs by the slitting process, and a method is developed to determine the dimensions of these rolls' working profile.
The rolling mill vibration not only seriously causes the strip thickness heterogeneity, but also damages the rolling mill equipment and its electrical components. Existing vibration suppression methods are passive and mainly tune mechanical, hydraulic, electrical and rolling process parameters. A new active vibration suppression method …
The method to predict strip profile presented in this work employs a global stiffnessbased linear system, and can therefore, if required, be used together with an appropriate mass matrix to predict dynamic responses of the rolling mill using well-known methods. 3.
Mill chatter seriously restricts the improvement of production efficiency and the development of new products. Thus, a method of cold rolling chatter monitoring and early warning is proposed based ...
2.1 CVC work roll contour. The research in this paper is based on a 1780 mm hot steel strip rolling line in China, Fig. 1 is a real photo of its seven-stand finishing mills (F1−F7). The first four finishing stands (F1−F4) are equipped with CVC work rolls, and the remaining finishing stands (F5−F7) are equipped with conventional contour work rolls.
In this chapter, the rolling practices generally followed by rollers have been discussed. For producing one or a group of finished rolled products (of different metals/alloys, shapes, sizes, quantities, etc.) the choice of mill stand design, its layout, rolling methods and techniques, pass sequence and schedule, etc., followed by a roller, …
In this work, a four high cold rolling mill is modeled as a spring-mass-damper system considering horizontally and vertically applied time-dependent forces due to the interaction between the strip and the working rolls. The effect of vibration of the moving strip on the work roll vibration is also considered for developing the governing equation …
A rolling mill and a method for setting the rolling mill according to the first embodiment of the present invention have been described above. According to the present embodiment, utilizing the fact that although the sizes of vertical roll load differences during normal roll rotation and during reverse roll rotation are approximately identical ...
Variable gauge rolling technology is a significant example of flexible metal forming technology and plays a crucial role in the high-quality development of the iron and steel industry [].It is considered the core technology of flexible rolling, flying gauge change and online roll change technology [].Longitudinally variable thickness strips produced by …
Steel factory hot rolling mill problem definition. The function of the hot rolling mill is based upon the simple mechanism of using rolls to press steel slabs and reduce their thickness, as illustrated in Fig. 3. Before slabs can be rolled into hot rolling mills, slabs should be heated to the deformation temperature using reheating furnaces.
This study is a comprehensive review about steel hot rolling mill scheduling from an operations research point of view, but some seemingly obvious articles are not included in the study for the following reasons: (1) the articles are not about steel hot rolling mill but are about aluminum or other metals (de Ladurantaye, Gendreau, & Potvin, …
Addressing the challenge of roll loss and strip deformation arising from the lack of precise prediction of the roll temperature field in hot tandem rolling mills, this study employs numerical analysis via the finite difference method. Based on the roll temperature field and hot roll crown model, an intelligent support cooling control system for the roll …
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