Wyniki wyszukiwania - BazTech

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The Off-Line Computer System for Design of the Hot Rolling and Laminar Cooling Technology for Steel Strips

Rauch Ł., Bzowski K., Kuziak R, Kitowski J., Pietrzyk M.

Journal of Machine Engineering

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2016

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Vol. 16, No. 2

27--43

EN

The objective of this work was development of the computer system VirtRoll, which allows designing of the arbitrary rolling line and performing numerical simulations using high efficiency hardware architectures. Selection of the mechanical, thermal, microstructural and phase transformation models, which allow decreasing the computing costs while the accuracy of simulations is maintained on the reasonable level, was one of the objectives of the paper. Thus, metamodel was applied in the mechanical part and a simple finite element approach was used in the thermal part of the hot rolling model. Simulations of microstructure evolution in hot rolling and phase transformations during the laminar cooling were based on modified Avrami equation. The system was designed in the client-server architecture, in which client part is in the form of the graphical interface. This interface allows to design of rolling line. The server part is composed of: i) controllers which prepare computing tasks, ii) middleware layer responsible for launching and monitoring of the computing tasks, iii) the layer of numerical computations. Deal.II library dedicated to solve partial differential equations was used for the time step adaptations. All these parts led to short computing times and additionally allowed parallel solution of the optimization tasks. Simulations of thermal-mechanical-microstructural phenomena were performed for the rolling-cooling sequence and the results allowed validation of the system.

2

Wykorzystanie metod symulacji do usprawnienia procesów planowania i przepływów strumieni materiałowych w walcowni gorącej taśm stalowych

Niekurzak M.

Logistyka

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2014

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nr 6

EN

When planning the production of steel strip hot - rolled there is a need to take into account a number of technological and organizational constraints, because the development of production schedules is very complex. The basis for building a system of production logistics flow of materials in the mill is fully formulate the model in terms of systems theory. The hot strip mill consists of production equipment, transport, storage and tape interop flowing through each device. The main objective of this approach is to support the decision in determining the workload of warehouse processes and the execution of experiments, including the variable load of the system. The presented results demonstrate the usefulness of the proposed models as tools to support decision-making processes at the level of the steel business management in both the design and operation of existing systems

PL

Przy planowaniu produkcji taśm stalowych gorąco-walcowanych istnieje konieczność uwzględnienia wielu ograniczeń technologicznych i organizacyjnych, dlatego opracowanie harmonogramów produkcji jest bardzo złożone. Podstawą do zbudowania logistycznego systemu produkcji przepływu materiałów w walcowni jest pełne sformułowanie modelu w ujęciu teorii systemów. System walcowni gorącej taśm składa się z urządzeń produkcyjnych, transportowych, magazynów międzyoperacyjnych oraz taśm przepływających przez poszczególne urządzenia. Głównym celem zastosowanego podejścia jest wspomaganie decyzji przy określeniu pracochłonności procesów magazynowych oraz wykonanie eksperymentów z uwzględnieniem zmiennych obciążeń systemu. Prezentowane wyniki badań świadczą o przydatności proponowanych modeli jako narzędzi wspomagających procesy decyzyjne na szczeblu zarządzania przedsiębiorstwem hutniczym zarówno na etapie projektowania, jak i eksploatacji istniejących systemów.

3

Influence of heat treatment on the Al-Si coating adhesion to steel strips

Żaba K.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 3 spec.

17--22

EN

A division of methods of coatings adhesion investigations, with special emphasis on qualitative methods is presented in the paper. The obtained results the Al-Si coating adhesion to a steel strips of DX52D grade are given. This strip was examined before and after the heat treatment in temperatures 250-700oC during 30-1440 minutes. Methods of thermal shock, bending, filing, network of cuts and tensile were applied in examinations. The assessment of the method adequacy was performed. Structure changes of coatings due to the heat treatments are presented as observations made by the scanning electron microscope.

4

Ocena jakości taśmy stalowej z powłoką Al-Si, przeznaczonej na rury zgrzewane

Żaba K.

Rudy i Metale Nieżelazne

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2008

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R. 53, nr 11

680-694

PL

W artykule przedstawiono wyniki badań stalowych taśm z powłoką Al-Si w stanie dostawy, przeznaczonych na zgrzewanie rury, wykorzystywane jako elementy układów wydechowych. Badaniom poddano taśmy z gatunku DX52D+AS120 i DX53D+AS120. Określono skład chemiczny, własności mechaniczne taśm, ich grubość, chropowatość i grubość powłoki. Dodatkowo wykonano badania przyczepności, odporności korozyjnej oraz odporności powłoki na działanie cykli cieplnych. Wyniki przedstawiono za pomocą narzędzi dostępnych w profesjonalnym programie Statistica oraz obserwacji makro- i mikroskopowych.

EN

The input materials for manufacturing welded tubes for elements of exhaust systems (strictly correlated and dependent from diameter and wall thickness of the manufactured tubes) are coiled, narrow strips, usually hot rolled (of very good surface quality), and, in case of precise tubes, cold rolled, of thickness determined by wall thickness of ready tubes. This input, directly after transferring to the technological line, is subjected to mechanical processing of edges and joined into an endless strip in the way of cross-wise welding of following coils. Furtherly, in a continuous line, the strip is formed into a tube, welded, calibrated and cut. For production of tubes provided for exhaust systems, strips of low-carbon steel or chromic seel are used. In the hereby work, two grades of steel strips with silumine coating - DX52D+AS120 and DX53D+AS120 - were subjected to detailed tests. The silumine coating is produced in the way of hot dip galvanizing, by submersion in a liquid Al-Si alloy, containing ca. 8-11 % Si. Addition of silicon significantly increases the resistance against performance of high temperatures and decreases problems connected with coating. A characteristic feature of this specific material is the presence of Al-Fe-Si diffusive layer between the metal and the coating, possessing good influence on adhesion and corrosion resistance of the coating. Simultaneously, increase of thickness of this layer, as well as of the thickness of the coating, results in decreasing material's capability for deforming. The work presents results of tests of delivered steel strips with Al-Si coating, provided for welded tubes applied as elements of exhaust systems. The chemical composition, mechanical properties, thickness and porosity of the steel strips, as well as the thickness of the coating, have been determined. Additionally, researches of coating resistance against performance of heat cycles, adhesion and corrosion resistance have been conducted. Results were presented by application of tools available in the professional Statistica program, as well as micro- and macroscope observations.