6 research outputs found
Kontrola kvalitete elektroerozijske teksture
This paper deals with quality control of the electro-discharge texturing. Automobile manufacturers have strict requirements for micro-geometry parameters of rolled metal plates from contractors of body sheet metal. The micro-geometry of the roll surface has significant influence on the final quality of the rolled metal plate. In this paper electro-discharge texturing parameters are analyzed, for example, the texturing current, impulse time, technological pause, and their impact to roughness average and peak counts. Quality control is discussed based on mathematical model for estimating the texturing current, impulse time, and technological pause for roughness average or peak counts required value.Rad opisuje kontrolu kvalitete elektroerozijske teksture. ProizvoÄaÄi automobila postavljaju prema dobavljaÄima lima za karoserije stroge zahtjeve za parametre mikrogeometrije valjanih limova. Mikrogeometrija valjane povrÅ”ine ima znaÄajan utjecaj na zavrÅ”nu kvalitetu valjanih limova. U ovom su radu analizirani parametri elektrolizijske teksture, npr., jakost struje, trajanje impulsa, tehnoloÅ”ka pauza i utjecaj na prosjeÄnu hrapavost i broj vrhova. Kontrola kvalitete se razmatra na osnovu matematiÄkog modela za procjenu jakosti struje, trajanja impulsa i tehnoloÅ”ke pauze za zahtjevanu hrapavost i broj vrhova
Kontrola kvalitete elektroerozijske teksture
This paper deals with quality control of the electro-discharge texturing. Automobile manufacturers have strict requirements for micro-geometry parameters of rolled metal plates from contractors of body sheet metal. The micro-geometry of the roll surface has significant influence on the final quality of the rolled metal plate. In this paper electro-discharge texturing parameters are analyzed, for example, the texturing current, impulse time, technological pause, and their impact to roughness average and peak counts. Quality control is discussed based on mathematical model for estimating the texturing current, impulse time, and technological pause for roughness average or peak counts required value.Rad opisuje kontrolu kvalitete elektroerozijske teksture. ProizvoÄaÄi automobila postavljaju prema dobavljaÄima lima za karoserije stroge zahtjeve za parametre mikrogeometrije valjanih limova. Mikrogeometrija valjane povrÅ”ine ima znaÄajan utjecaj na zavrÅ”nu kvalitetu valjanih limova. U ovom su radu analizirani parametri elektrolizijske teksture, npr., jakost struje, trajanje impulsa, tehnoloÅ”ka pauza i utjecaj na prosjeÄnu hrapavost i broj vrhova. Kontrola kvalitete se razmatra na osnovu matematiÄkog modela za procjenu jakosti struje, trajanja impulsa i tehnoloÅ”ke pauze za zahtjevanu hrapavost i broj vrhova
Kontrola toÄke staljivanja na aglomeracijskoj traci
The paper describes the control of burn-through point for sinter on the agglomeration belt. This control is based on mathematical modelling of agglomeration process. The mathematical models and algorithms are derived from basic models of physical and chemical processes of agglomeration belt and they are based on directly and indirectly measured quantities of agglomeration belt. The feed-forward control is based on the quantity of the gas combusted in the ignition furnace and on the quantity and composition of the raw mix. This value is corrected according to the identified burn-through point. Output from the control system is the required value of turbo-exhausters operating speed.U radu se opisuje kontrola toÄke staljivanja sintera na aglomeracijskoj traci. Ta se kontrola zasniva na matematiÄkom modeliranju aglomeracijskog procesa. MatematiÄki modeli i algoritmi su izvedeni iz temeljnih modela fiziÄkih i kemijskih procesa na aglomeracijskoj traci i osnivaju se na izravno i neizravno izmjerenim koliÄinama na aglomeracijskoj traci. Kontrola kretanja naprijed se zasniva na koliÄini plina izgorenog u potpalnoj peÄi i na koliÄini i sastavu sirove mjeÅ”avine. Ta veliÄina se ispravlja prema utvrÄenoj toÄki staljivanja. Izlaz iz kontrolnog sustava je tražena vrijednost operativne brzine turbo-puhala
Smanjvanje troÅ”kova proizvodnje željeza promjenama parametara vjetra visoke peÄi
The blast-furnace wind from hot-blast stoves is a significant factor of the blast furnace functioning. The technology was analyzed in which the hot wind from hot-blast stoves is not mixed with the cool wind to a constant wind temperature, but is blown directly into the blast furnace. However, it is necessary to compensate for the changes of the theoretical temperature of burning in blast furnace as a consequence of non-stabilized wind temperature, by changing composition of the wind. This can be done by adding different media into the wind with different results from the operational and economical viewpoints. Essentially, the following types of media are used in blast furnaces: steam, oxygen, substitution fuels, nitrogen, and waste gas.Vjetar visoke peÄi i peÄi za zagrijavanje znaÄajno utjeÄe na rad visoke peÄi. Analizirana je tehnologija kod koje se vruÄi vjetar iz peÄi za zagrijavanje ne mijeÅ”a s hladnim vjetrom do postizanja konstantne temperature nego se direktno upuhuje u visoku peÄ. MeÄutim, potrebno je promjenama sastava vjetra kompenzirati promjene teorijske temperature izgaranja u visokoj peÄi uzrokovane nestabiliziranom temperaturom vjetra. Ovo se može obaviti dodavanjem razliÄitih medija u vjetar uz postizanje razliÄitih rezultata s pogonskog i ekonomskog glediÅ”ta. U biti, kod visokih peÄi se koriste sljedeÄi mediji: vodena para, kisik, zamjenskog goriva, duÅ”ika i otpadnih plinova
Smanjvanje troÅ”kova proizvodnje željeza promjenama parametara vjetra visoke peÄi
The blast-furnace wind from hot-blast stoves is a significant factor of the blast furnace functioning. The technology was analyzed in which the hot wind from hot-blast stoves is not mixed with the cool wind to a constant wind temperature, but is blown directly into the blast furnace. However, it is necessary to compensate for the changes of the theoretical temperature of burning in blast furnace as a consequence of non-stabilized wind temperature, by changing composition of the wind. This can be done by adding different media into the wind with different results from the operational and economical viewpoints. Essentially, the following types of media are used in blast furnaces: steam, oxygen, substitution fuels, nitrogen, and waste gas.Vjetar visoke peÄi i peÄi za zagrijavanje znaÄajno utjeÄe na rad visoke peÄi. Analizirana je tehnologija kod koje se vruÄi vjetar iz peÄi za zagrijavanje ne mijeÅ”a s hladnim vjetrom do postizanja konstantne temperature nego se direktno upuhuje u visoku peÄ. MeÄutim, potrebno je promjenama sastava vjetra kompenzirati promjene teorijske temperature izgaranja u visokoj peÄi uzrokovane nestabiliziranom temperaturom vjetra. Ovo se može obaviti dodavanjem razliÄitih medija u vjetar uz postizanje razliÄitih rezultata s pogonskog i ekonomskog glediÅ”ta. U biti, kod visokih peÄi se koriste sljedeÄi mediji: vodena para, kisik, zamjenskog goriva, duÅ”ika i otpadnih plinova
Metode praÄenja intenziteta toplinskog toka u stjenci visoke peÄi
In this paper we present the main features of an online system for real-time monitoring of the bottom part of the blast furnace. Firstly, monitoring concerns the furnace walls and furnace bottom temperatures measurement and their visualization. Secondly, monitored are the heat flows of the furnace walls and furnace bottom. In the case of two measured temperatures, the heat flow is calculated using multi-layer implicit difference scheme and in the case of only one measured temperature, the heat flow is calculated using a method based on application of fractional-order derivatives. Thirdly, monitored is the theoretical temperature of the blast furnace combustion process in the area of tuyeres.U radu se prikazuju osnovna svojstva on-line sustava za praÄenje u realnom vremenu donjeg dijela visoke peÄi. Prvo, praÄenje obuhvaÄa mjerenje temperatura stijenki i dna visoke peÄi te njihovu vizualizaciju. Drugo, prate se toplinski tokovi na stijenkama i dnu peÄi. U sluÄaju dvaput izmjerene temperature, toplinski tok se raÄuna koriÅ”tenjem viÅ”eslojne implicitne sheme diferencije, a u sluÄaju samo jednom izmjerene temperature, toplinski tok se raÄuna koriÅ”tenjem metode koja se temelji na primjeni frakcionalnih derivacija. TreÄe, prati se teoretska temperatra procesa izgaranja u podruÄju otvora za zrak