Numerical Simulation of the Rolling Process of Pipeline Sheet

2015 ◽  
Vol 220-221 ◽  
pp. 813-817
Author(s):  
Anna Kawałek ◽  
Monika Magiera ◽  
Henryk Dyja ◽  
Marcin Knapiński ◽  
Bartosz Koczurkiewicz ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Metal Forming ◽  
Energy Analysis ◽  
Rolling Process ◽  
Chemical Compositions ◽  
New Materials ◽  
Rolling Moment ◽  
Heavy Loads ◽  
High Level ◽  
Rolling Technology

The Institute of Metal Forming and Safety Engineering has developed technology for manufacturing grade X80 pipeline plates according to European standard EN 10208-2. Experimental chemical compositions ensuring a high level of yield strength have been developed. The article describes a method for selecting chemical composition [1]. The advancement of rolling technology takes much time and many calculations. Thus, using numerical simulations provides a possibility of a theoretical analysis of the plates made from new materials [4], [5]. Preliminary studies [1] have disclosed a large volume of deformations during the rolling process, which causes the distortion of rolls and generates heavy loads. For the theoretical analysis of rolling plates, Forge 2008® was used. The paper presents the obtained results of energy analysis and strength parameters displayed in Figure 1. The article considers a total amount of pressure on metal rollers and changes in the rolling moment.

Numerical Modelling of the Microstructure during Rolling of Flat Bars

2010 ◽  
Vol 165 ◽  
pp. 382-387
Author(s):  
Piotr Szota ◽  
Andrzej Stefanik ◽  
Henryk Dyja
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Analysis ◽  
Numerical Modelling ◽  
Computer Software ◽  
Rolling Process ◽  
Accelerated Cooling ◽  
Bar Rolling ◽  
Proposed Modification ◽  
Rolling Technology

This paper presents theoretical analysis of microstructure changes in the material during standard rolling and normalizing rolling of the 35x20 mm flat bars. The analysis was carried out by means of computer software Forge 2007® that is based on finite element method. Two cases of accelerated cooling during rolling process were considered. Numerical results of 35x20 mm flat bars rolling process allowed to determine the average recrystallized austenite diameter as well as basis energy and force parameters. Proposed modification of the 35x20 mm flat bar rolling technology with accelerated cooling results in the reduction of average austenite diameter, which could improve the strength of the final product.

scholarly journals Machine Learning-Based Models for the Estimation of the Energy Consumption in Metal Forming Processes

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 833
Author(s):  
Irene Mirandola ◽  
Guido A. Berti ◽  
Roberto Caracciolo ◽  
Seungro Lee ◽  
Naksoo Kim ◽  
...  
Keyword(s):  
Machine Learning ◽  
Finite Element ◽  
Energy Consumption ◽  
Metal Forming ◽  
Mutual Influence ◽  
Rolling Process ◽  
Ring Rolling ◽  
Gradient Boosting ◽  
Average Error ◽  
Ring Rolling Mill

This research provides an insight on the performances of machine learning (ML)-based algorithms for the estimation of the energy consumption in metal forming processes and is applied to the radial-axial ring rolling process. To define the mutual influence between ring geometry, process settings, and ring rolling mill geometries with the resulting energy consumption, measured in terms of the force integral over the processing time (FIOT), FEM simulations have been implemented in the commercial SW Simufact Forming 15. A total of 380 finite element simulations with rings ranging from 650 mm < DF < 2000 mm have been implemented and constitute the bulk of the training and validation datasets. Both finite element simulation settings (input), as well as the FI (output), have been utilized for the training of eight machine learning models, implemented with Python scripts. The results allow defining that the Gradient Boosting (GB) method is the most reliable for the FIOT prediction in forming processes, being its maximum and average errors equal to 9.03% and 3.18%, respectively. The trained ML models have been also applied to own and literature experimental cases, showing a maximum and average error equal to 8.00% and 5.70%, respectively, thus proving once again its reliability.

Hohl-Quer-Fließpressen mit geregelten Querstempeln*/Hollow lateral extrusion with controlled counterpunches - Improving the branches’ form accuracy by a superposition of a hydrostatic pressure on the forming zone

2015 ◽  
Vol 105 (10) ◽  
pp. 697-703
Author(s):  
J. Wälder ◽  
A. Felde ◽  
M. Liewald ◽  
O. Napierala ◽  
M. Haase ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Metal Forming ◽  
Feasibility Studies ◽  
Drive Train ◽  
Lightweight Construction ◽  
Form Accuracy ◽  
Lateral Extrusion ◽  
Forming Technology ◽  
New Process ◽  
High Level

Als Beitrag zur Gewichtsreduktion von Komponenten im Antriebsstrang moderner PKWs wird am IFU Stuttgart und am IUL Dortmund ein neues Verfahren zur Herstellung hohler Bauteile mittels Querfließpressen entwickelt. Aufbauend auf ersten Machbarkeitsuntersuchungen werden in dieser Veröffentlichung Maßnahmen gezeigt, mit denen das herstellbare Geometriespektrum hinsichtlich der Verfahrensgrenze gegen Risse erweitert sowie eine Verbesserung der Formabweichung erreicht werden kann. &nbsp; As a contribution towards a reduction in weight of automotive drive train components, a new process for producing hollow components by lateral extrusion is being developed at the Institute for Metal Forming Technology (IFU) in Stuttgart and the Institute of Forming Technology and Lightweight Construction (IUL) in Dortmund. Based upon first feasibility studies, methods are shown in this publication to extend the spectrum of the producible geometries and to achieve a high level of form accuracy.

Achievements of female athletes in different disciplines of ketlebell lifting at the present stage

2021 ◽  
pp. 110-113
Author(s):  
K. V. Prontenko ◽  
V. Ya. Andreychuk ◽  
O. M. Kisilyuk ◽  
S. P. Griban ◽  
D. P. Polozenko ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Research Methods ◽  
Female Athletes ◽  
Present Stage ◽  
Training Process ◽  
Documentary Method ◽  
Stage Of Development ◽  
Current State ◽  
Arbitrary Change ◽  
High Level

The article is devoted to the study of the current state of female athletes’ training in ketlebell lifting. The dynamics of fulfillment of standards of the master of sports of Ukraine by female athletes in all disciplines of ketlebell lifting in the period from 2016 to 2021 is analyzed. Female athletes (women aged 18-35 years) of national teams of regions of Ukraine in weight categories up to 58 kg, up to 63 kg, up to 68 kg and over 68 kg took part in the study. The protocols of the championships of Ukraine for the specified period were analyzed. Research methods: theoretical analysis and generalization of scientific and methodical literature and documentary method (study of competition protocols). It was found that in the snatch for the period under study the standard of the master of sports obeyed only three athletes, but in the jerk and long cycle no one female athletes have not fulfill the standarts. In addition, in a snatch with an arbitrary change of hands for 12 minutes (R-12), which was introduced in 2019 to attract more women to ketlebell lifting and popularize ketlebell lifting among women, in three years the standard of master of sports obeyed 27 female athletes. This allows us to say that at the present stage of development of ketlebell lifting there is a high level of preparedness of female athletes in the discipline of R-12 and the popularity of exercises with ketlebells among women. The need to improve the training process of female athletes in other disciplines of ketlebell lifting was also confirmed.

The First Molecular Wheel: A Theoretical Investigation

2011 ◽  
Vol 1286 ◽  
Author(s):  
Gustavo Brunetto ◽  
Fernando Sato ◽  
Xavier Bouju ◽  
Douglas S. Galvao
Keyword(s):  
Molecular Dynamics ◽  
Theoretical Analysis ◽  
Scanning Tunneling Microscope ◽  
Copper Substrate ◽  
Spatial Separation ◽  
Rolling Process ◽  
Scanning Tunneling ◽  
Hydrocarbon Molecule ◽  
Tunneling Microscope ◽  
Molecular Dynamics Methods

ABSTRACTRecently, the first molecular nanowheel was synthesized and characterized from Scanning Tunneling Microscope (STM) experiments. It was demonstrated that a specifically designed hydrocarbon molecule (C44H24) could roll on a copper substrate along the [110] surface direction. In this work we report a preliminary theoretical analysis of the isolated molecule and of its rolling processes on different Cu surfaces. We have used ab initio and classical molecular dynamics methods. The simulations showed that the rolling mechanism is only possible for the [110] surface. In this case, the spatial separation among rows of copper atoms is enough to ‘trap’ the molecule and to create the necessary torque to roll it. Other surface orientations ([111] and [100]) are too smooth and cannot provide the necessary torque for the rolling process.

Study of dynamics of value systems of youth’s leaders under pedagogical conditions of value-motivational development

2020 ◽  
pp. 23-27
Author(s):  
A.A. Oschepkov ◽  
◽  
V.V. Friauf
Keyword(s):  
Experimental Study ◽  
Leadership Development ◽  
Social Interaction ◽  
Theoretical Analysis ◽  
Value Systems ◽  
Study Results ◽  
Values Development ◽  
High Level ◽  
Group Interests

Presented is study in the problem of leadership in youth environment, in frames of which theoretical analysis of scientific works was conducted. The analysis showed, that the most actual in the present time is the value approach to leadership development for verification of which is experimental study is conducted. Results of the experiment showed dynamics of changes in values systems of both girls and boys during the period of conducting psycho-pedagogical program of values development. The analysis of experimental study results showed, that values orientations system of girls with high level of leader’s ability is oriented to social interaction, and values orientations system of boys with high level of leader’s ability is oriented to inner-group interests.

HEIFERS POSTSLAUGHTER MEAT PRODUCTIVITY EVALUATION AT DIET USE OF FEED ADDITIVES BIODARIN

2016 ◽  
Vol 1 (1) ◽  
pp. 30-32
Author(s):  
Тагиров ◽  
Khamit Tagirov ◽  
Долженкова ◽  
Galina Dolzhenkova
Keyword(s):  
Meat Quality ◽  
Meat Products ◽  
Feed Additives ◽  
Feed Additive ◽  
Control Group ◽  
Chemical Compositions ◽  
Group Iii ◽  
Group I ◽  
Meat Productivity ◽  
High Level

The purpose of research focused on post-slaughter evaluation of meat productivity and meat quality the Kazakh White-headed breed when introduced into the diet of feed additives BioDarin. Presents the results of the control slaughter heifers 18 months old as well as the results of studies of morphological and chemical compositions of the carcass. The research was conducted post-slaughter evaluation of meat productivity and meat quality of heifers of Kazakh White-headed breed when introduced into the diet of feed additives BioDarin. Scientific and economic experiment was carried out on the basis of JSC AIC «Alga+» Tuimazinsk district of the Republic of Bashkortostan. For the experiment there were formed 4 groups of heifers of Kazakh white-headed breed: group I – control; group II heifers in addition to the basic diet received a feed additive in a dose of 0.5 kg per 100 kg of grain mixture, the animals of group III received 1 kg of the feed additive per 100 kg of grain mixture, peers IV groups received 1.5 kg of a grain mixture. Among the studied groups, heifers of the III experienced group receiving feed additive at a dose of 1.0 kg per 100 kg of grain mixture, had a high level of meat productivity. It was found that meat products of the best quality was got also from animals of group III.

Three-Roll Planetary Rolling Mill Motion Analysis and Test Research

2013 ◽  
Vol 712-715 ◽  
pp. 1724-1728 ◽  
Author(s):  
Zi Wu Yin
Keyword(s):  
Theoretical Analysis ◽  
Rolling Mill ◽  
Planetary Gear ◽  
Rolling Process ◽  
Planetary Mill ◽  
Gear Train ◽  
System Structure ◽  
Planetary Motion ◽  
Clockwise Rotation ◽  
Planet Carrier

Against defects of three-roll fixed axis rolling mill caused by rolled piece rotating in process of rolling, presented three-roll planetary rolling scheme, designed the planetary transmission system structure, expounded planetary mill rolling process, analyzed movement relationship between planet carrier, roll and rolled piece according to planetary gear train transmission principle. The rolls do planetary motion and spinning motion both, the former acts on the rolled piece to make it do clockwise rotation movement, the latter acts on the rolled piece to make it do anti-clockwise rotation. The actual movement of rolled piece is combination of the two motions. The theoretical analysis and calculation shows that in rolling process of planetary mill, the speeds of above two kinds of motions are very close, directions are opposite. Due to rolls are inclined compare to the rolled piece, as a result rolled piece does axial movement with a speed of vsinα, radial rotation speed is 0.0029 times of planet carrier rotational speed. Thanks to complexity of extrusion and friction between rolls and rolled piece, the actual speed of rolled piece is approximately zero. Prototype rolling test has verified correctness of theoretical analysis and calculation.

A Theoretical Analysis of the Bending into Cylindrical Dies of Metal Strips

1984 ◽  
Vol 198 (2) ◽  
pp. 99-108 ◽  
Author(s):  
T X Yu ◽  
W Johnson
Keyword(s):  
Theoretical Analysis ◽  
Metal Forming ◽  
Plastic Material ◽  
Forming Process ◽  
Rigid Plastic ◽  
Rigid Plastic Material ◽  
Punch Load ◽  
Theoretical Predictions ◽  
Metal Forming Process ◽  
Good Agreement

Based on experiments on the bending of metal strips into cylindrical dies using a semi-circular ended punch (1) a theoretical analysis of this metal forming process is presented to predict the punch load—punch travel characteristic and the clearance between the punch pole and the mid-point of the strip. Elastic/plastic and rigid/plastic material idealizations are employed, and the effect of friction between the strip and the die is also considered. The theoretical predictions show good agreement with the experimental results and are useful for designers.

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