scholarly journals Overriding plate thickness control on subducting plate curvature

2015 ◽  
Vol 42 (10) ◽  
pp. 3802-3810 ◽  
Author(s):  
Adam F. Holt ◽  
Bruce A. Buffett ◽  
Thorsten W. Becker
Keyword(s):  
Plate Thickness ◽  
Thickness Control ◽  
Plate Curvature ◽  
Subducting Plate

High-Accuracy Plate Thickness Control

1981 ◽  
Vol 14 (2) ◽  
pp. 2507-2514
Author(s):  
M. Saito ◽  
S. Tanimoto ◽  
H. Tsukamoto ◽  
Y. Naba
Keyword(s):  
Plate Thickness ◽  
High Accuracy ◽  
Thickness Control

The steel plate curvature analytic modeling for the snake rolling with the same roll diameters

2021 ◽  
Vol 118 (2) ◽  
pp. 205
Author(s):  
Lian-Yun Jiang ◽  
Jin-Bo Huang ◽  
Tao Zhen ◽  
Yao-Yu Wei ◽  
Zhen-Lei Li
Keyword(s):  
Shear Strain ◽  
High Performance ◽  
Steel Plate ◽  
Axial Strain ◽  
Plate Thickness ◽  
Theoretical Method ◽  
Simulation Method ◽  
Rolling Process ◽  
Speed Ratio ◽  
Plate Curvature

The snake rolling can keep the plate shape well, and the larger shear strain produced by the snake rolling is conducive to the deformation penetrating into the center of the heavy plate. So it provides a new method for producing the high-performance heavy steel plate. However, there is little research on the plate curvature modeling which is the key to achieve the snake rolling process. The deformation region was divided into four different zones at most which was depended on the positions of the two neutral points, and this number could be dropped to three or two in some other conditions. It was divided into three different cases according to the neutral point position: I, II, III and IV; I, II and IV; II and IV. The unit pressure and the accumulated shear strain deviation between the top and bottom portions of the plate with every case were established, and the plate curvature caused by shear strain was calculated on this basis. The plate curvature caused by the axial strain was also calculated according to the flow criterion. The approximations are corrected by a fitting coefficient E. The homogeneity coefficient E was introduced during the plate curvature modeling process to make the model more accurate. Then the total plate curvature model was established. The simulation of snake rolling process is carried out by using ANSYS LS-DYNA, and the plate curvature results are compared with the theoretical method. The results showed that the maximum and minimum relative error of the model was 11.61% and 0.28% compared to the simulation method, which can be applied for the online plate curvature control application with the effect of some self-learning methods. The plate curvature affecting law with the different process parameters (roll offset, roll speed ratio, rolling reduction, plate thickness and so on) was obtained in this paper. The research about the plate curvature modeling will provide important references for the heavy steel plate snake rolling production.

scholarly journals Improving the Control Accuracy of the Strip Plate During Shaped Rolling Using Electric and Hydraulic Drives

2019 ◽  
pp. 43-53
Author(s):  
Vadim R. Gasiyarov ◽  
Boris M. Loginov ◽  
Stanislav S. Voronin
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Plate Thickness ◽  
Response Speed ◽  
Automatic Process Control System ◽  
Plate Mill ◽  
Thickness Control ◽  
Technological Advantage ◽  
Strip Plate

It is important to reduce the amount of metal waste caused by scrap edge and scrap ends in the process of rolling at plate rolling mills. The influence of the correlation of the elongation ratio during drawing and spreading on the geometric shape of the strip plate was estimated. The paper shows the advantages of rolling process forming a double-cone profile at the head and tail sections. The ASC technology was introduced, which makes use of the multipoint strategy of thickness setting along the strip plate length. The importance of improving the accuracy of automatic control of position of screw-down structures and thickness was established when this strategy is used. The paper shows the structure and characteristics of the thickness automatic control system of the plate mill 5000. The analysis of oscillograph records of the strip plate thickness was carried out during the shaping pass for the current settings of the thickness automatic control system. Some deviations were recorded, which were caused by the lag of the regulating signal with respect to the actual deviation of thickness during displacement of the screw-down structures. To improve the response speed of the thickness automatic control system and to reduce the dynamic lag, a method of thickness control with pre-control was offered. The research group considered the double-circuit thickness automatic control system with the feed forward control of the target signal and established the transfer function of the pre-control channel. The paper demonstrated the structure of the simulation model of interrelated electric systems of a reverse rolling stand providing the opportunity of the joint research of shaped rolling and forming of a bend at the head end of the strip plate. The circuits of individual blocks of the model were considered. Comparative analysis of time curves of the strip plate thickness was carried out for the implementation of the design and the developed control algorithms and the increase in the response speed of the thickness automatic control system was proved. The paper demonstrates the oscillograph records obtained during the implementation of the developed algorithm in the automatic process control system of the reverse stand of the plate mill 5000. As a result of their comparison with the oscillograph records of the designed settings of the thickness automatic control system, it was proved that the accuracy of the thickness control improved. The paper notes that the main technological advantage of implementation of the developed algorithm is improving of the final product quality.

scholarly journals Development of Plate Thickness Control with High Accuracy in Plate Mill

1993 ◽  
Vol 79 (3) ◽  
pp. 318-325 ◽  
Author(s):  
Kenichi OHE ◽  
Yoshio MORIMOTO ◽  
Shigemi KAJIURA ◽  
Kazuhiko HIGASHI ◽  
Keima ANRAKU ◽  
...  
Keyword(s):  
Plate Thickness ◽  
High Accuracy ◽  
Plate Mill ◽  
Thickness Control

Using phase field and third-order shear deformation theory to study the effect of cracks on free vibration of rectangular plates with varying thickness

2020 ◽  
Vol 71 (7) ◽  
pp. 853-867
Author(s):  
Phuc Pham Minh
Keyword(s):  
Free Vibration ◽  
Shear Deformation ◽  
Phase Field ◽  
Deformation Theory ◽  
Plate Thickness ◽  
Shear Deformation Theory ◽  
Rectangular Plates ◽  
Equilibrium Equations ◽  
Third Order ◽  
Free Vibration Frequency

The paper researches the free vibration of a rectangular plate with one or more cracks. The plate thickness varies along the x-axis with linear rules. Using Shi's third-order shear deformation theory and phase field theory to set up the equilibrium equations, which are solved by finite element methods. The frequency of free vibration plates is calculated and compared with the published articles, the agreement between the results is good. Then, the paper will examine the free vibration frequency of plate depending on the change of the plate thickness ratio, the length of cracks, the number of cracks, the location of cracks and different boundary conditions

Estimation of Some Mechanical Properties for Similar & Dissimilar Welded Joints

2014 ◽  
Vol 2 (1) ◽  
pp. 59-76
Author(s):  
Abdullah Daie'e Assi
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Austenitic Stainless Steel ◽  
Base Metal ◽  
Welded Joints ◽  
Plate Thickness ◽  
Low Carbon Steel ◽  
Dissimilar Metals ◽  
Low Carbon ◽  
Steel Type

This research deals with the choice of the suitable filler metal to weld the similar and dissimilar metals (Low carbon steel type A516 & Austenitic stainless steel type 316L) under constant conditions such as, plate thickness (6 mm), voltage (78 v), current (120 A), straight polarity. This research deals with three major parts. The first parts Four types of electrodes were used for welding of dissimilar metals (C.St A516 And St.St 316L) two from mild steel (E7018, E6013) and other two from austenitic stainless steel (E309L, E308L) various inspection were carried out include (Visual T., X-ray T., δ- Ferrite phase T., and Microstructures T.) and mechanical testing include (tensile T., bending T. and micro hardness T.) The second parts done by used the same parameters to welding similar metals from (C.St A516) Or (St.St 316L). The third parts deals with welding of dissimilar weldments (C.St And St.St) by two processes, gas tungsten are welding (GTAW) and shielded metal are welding (SMAW).        The results indicated that the spread of carbon from low carbon steel to the welding zone in the case of welding stainless steel elect pole (E309L) led to Configuration Carbides and then high hardness the link to high values ​​compared with the base metal. In most similar weldments showed hardness of the welding area is  higher than the hardness of the base metal. The electrode (E309L) is the most suitable to welding dissimilar metals from (C.St A516 With St.St 316L). The results also showed that the method of welding (GTAW) were better than the method of welding (SMAW) in dissimilar welded joints (St.St 316L with C.St A516) in terms of irregular shape and integrity of the welding defects, as well as characterized this weldments the high-lift and resistance ductility good when using the welding conditions are similar.

Simultaneous Diameter and Thickness Control in Tube Extrusion

1991 ◽  
Vol 6 (3) ◽  
pp. 188-194 ◽  
Author(s):  
G. Defaye ◽  
L. Caralp ◽  
B. Delfanne ◽  
J. J. Labaig
Keyword(s):  
Thickness Control ◽  
Tube Extrusion
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