|
|
1. 2. 3. 4.
|
1.
Edo Meyer, Ashley Stone. Livarski vestnik. MAXImolding! Technology GmbH, Germany.
THE FUTURE OF LIGHTWEIGHT METAL PARTS: THE MAXIMOLDING® PROCESS, THE MAXIMOLDING® MACHINE, MULTI-SHOT-MULTI-INJECTORS-PRESS (TERAPRESS™ AT SMALL SIZE) IN SMART DIGITAL FOUNDRIES.
Abstract
Semisolid metal injection molding is a molding process that involves filling a mold with metal in a partially molten state in which globules of solid are homogeneously dispersed in the liquid. The four currently used semisolid metal casting processes, Thixomolding®, Thixocasting®, Rheocasting®, and stress-induced melt activation (SIMA), are complex to start and very highly maintenance intensive. The processes, cold or hot chamber diecasting or vacuum die-casting, do not fulfill end-user expectations for quality, simplicity, energy savings, safety, economy, and environmental responsibility. This is where the MAXImolding® process comes in and further simplifies and improves the Thixomolding® process. MAXImolding® process involves mechanically stressed chips or chips in preferred metallurgical configurations.
Keywords: high chromium white cast iron, grinding balls, al5ti1b ingots, corrosion
2.
L. Lazić, M. Lovrenić-Jugović, M. Borošić. Livarski vestnik. University of Zagreb, Faculty of metallurgy.
DETERMINING THE RATIO OF THE METAL COMPONENTS OF THE CHARGE AT THE CUPOLA FURNACE.
Abstract
The most important equipment in a foundry is the melting furnace. Various types of furnaces have been used for cast iron melting. In cases of melt preparation for production at high capacities, the primary melting methods used in iron casting plants are cupola furnaces or electric melt furnaces. The main advantages of cupola furnaces compared to electric ones are: simple and economical device, less harmful to the environment, less sensitive to low-quality charge materials and contaminants, oxidation and reduction reactions take place within and above the melt zone during cupola melting, which allows the use of highly oxidized and low-quality scrap material, lower prices of alloys and non-metallic additions. One of the basic technological problems in the work of the cupola furnace is to determine the relationships between the charge components consisting of coke, flux, and metal charge to obtain a melt of a given chemical composition. In practice, the mass ratio of metal charge and coke is in certain mass relations as well as the total mass of flux in relation to the mass of coke. It turns out that the main problem is to determine the components of the metal part of the charge, which usually consists of waste of own production, steel scrap, purchased cast iron, nodular cast iron, silicon manganese, ferrosilicon, etc. In this paper, using the method of selection from the available range, the proportions of metal components of the metal part of the charge were calculated to produce a gray cast iron melt standardized with the code EN-GJL-250.
Keywords: cupola furnace, charge, metal, components
3.
Suresh Kumar Subbarayalu, Muralidhar Manapuram. Livarski vestnik. Dept. of Mechanical Engineering, North Eastern Regional Institute of Science and Technology, India.
STATUS OF ELECTRIC LIGHT MOTOR VEHICLES IN INDIA: A STUDY.
Abstract
India is the fourth largest Light Motor Vehicle (LMV) manufacturer in the world. Presently production of 4 million LMVs has been produced annually using internal combustion engines (ICE). India has started the manufacturing of electric vehicles (EVs) since 2015 and has been increasing production rapidly. Electric Light Motor Vehicles (ELMV) driven by electric motors powered by rechargeable batteries with or without IC engine (ICE) coupled with transmission including differential have been widely manufactured. Hybrid Electric Light Motor Vehicle (HELMV) is propelled by both ICE and battery. HELMV sub-systems comprise of battery, electric motor, power electronics and transmission, power coupler, and ICE. In the present work hybrid electric vehicle and their sub-systems have been identified and different power train systems namely series, parallel, series-parallel, and complex are discussed. An attempt has also been made to find the status of HELMV manufacturing and its future growth by 2030AD, sub-systems identified as suitable to the Indian automobile industry along with techno-economic analysis.
Keywords: Light motor vehicle, Hybrid electric light motor vehicle, Internal combustion engine, Power train system, power electronics, and Techno-economic analysis
4.
Delijić, M. Filipović, V. Manojlović.Livarski vestnik. University of Montenegro, Montenegro, University of Belgrade, Belgrade.
CORROSION BEHAVIOR OF HIGH-CHROMIUM WHITE CAST IRON GRINDING BALLS PRODUCED WITH AL5TI1B INOCULANT.
Abstract
Corrosion behavior of high-chromium white cast iron (HCWCI) alloys for grinding balls produced with the addition of Al5Ti1B grain refiner (0,5 - 2,0 wt.%), were evaluated by electrochemical methods, followed by microstructure analysis and hardness measuring. An Al5Ti1B master alloy is used as an inoculant, having a double role: a degassing agent and a modification agent since in addition to aluminum, it contains carbide-forming elements, titanium and boron. Corrosion tests were performed in 0,1 M NaCl and fresh water. The samples were tested in the as-cast conditions. The HCWCI alloy modified by 0,5 wt.% of Al5Ti1B, showed the optimal combination of tested properties.
Keywords: high-chromium white cast iron, grinding balls, Al5Ti1B inoculants, corrosion