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1
Content available remote An attempt to specify the degradation of the electric furnace hearth for the determination of future operating properties
Soszyński W., Studnicka A.
Archives of Materials Science and Engineering
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2012
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Vol. 57, nr 2
88-93
EN
Purpose: of this paper is the analysis of potential use of new materials in the electric furnace hearth lining and indication of the operating effects for the furnace resulting from their use. The impact of the application of new hearth lining materials on a total power needed to receive through air cooling system of the furnace hearth was also analyzed. Design/methodology/approach: Within the frameworks of research, electric furnace operational properties were compiled and a furnace mathematical model on the basis of the finite element method was created. Based on operational data the created model was calibrated. Analysis of the influence of new hearth lining materials on the furnace operation was performed. In analysis the change of materials properties resulting from the furnace operation over the years was taken into consideration. Findings: As a result of carried out calculations and analysis the amounts of heat flux transferred, in successive periods of operation, through hearth working layer to cooling installations were acquired. Basing on simulations and calculations, for the above mentioned heat flux, temperatures were calculated on the bottom shell of furnace, in the electrodes axes for different periods of furnace operation. Practical implications: To achieve a decrease in thermal load of hearth it is advisable to reduce thickness of filling material near the vertical wall of furnace and filling the acquired space with new graphite blocks applied to the last layer of hearth. Those information were crucial and had an actual impact on a final design of furnace lining. Originality/value: Carried out analysis have crucial meaning for furnace user, as they allow to predict the probable operation of furnace with new lining materials over the years. This will also make it easier to control the state of lining materials wear and will allow for a better process control.
2
Content available remote Montaż silników liniowych w obrabiarkach i maszynach technologicznych
Kowalski T., Niedbała M.
Technologia i Automatyzacja Montażu
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2008
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nr 2
24-27
EN
Application of linear engines to power machine tools. Advantages and disadvantages of the linear engines. Assembling difficulties. Necessary assembling tools. Testing of the power modulus with the linear engines used and comparison of those results with the properties of a classically powered engine modulus.
3
Content available remote The signal connections in robot integrated manufacturing systems
Reclik D., Kost G., Świder J.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
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Vol. 23, nr 1
87-90
EN
Purpose: The main goal of this paper is that, the robot integrated manufacturing systems are more popular and useful in the industry. Moreover, the communication in those systems might be realized by many different data exchange solutions. Using this kind of solution causes the data exchange incompatibility. This paper deals with different ways in informatics connection of all of the components in robot integrated manufacturing system. Design/methodology/approach: Incompatibility is a result of usage many different communication systems between components in lathe center. The way of mutual signal connections were the target of researches. Findings: As a result of scientific work, the universal and compatible informatics connection system of the robot lathe center was created. Research limitations/implications: The project of the data exchange system is confined to PROFIBUS DP Ian. Practical implications: The result of the researches was developing a technical element choice procedure of the data exchange depending on transport means quantity and system composition in the robot lathe system. Originality/value: This is a brand new paper, which describes internal systems of data exchange in robot integrated manufacturing system in example of automatic lathe center.
4
Content available remote Processing of soybean meal into concentrates and testing for Genetically Modified Organism (GMO)
Vindis P., Mursec B., Janzekovic M., Cus F.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
|
Vol. 20, nr 1-2
507-510
EN
Purpose: The purpose of the paper is to show how the soybean meal is processed into the feed concentrate and how the GMO content is tested when the soybean meal is accepted in the feed concentrate factory. Design/methodology/approach: After acceptance of the soybean meal the analysis for the protein and moisture content is made by the use of Inframatic. The average monthly sample is sent to an external laboratory for testing for GMO content. According to the regulations the GMO content must not exceed 0,9% and is determined by the PCR (polymeraze chain reaction) method. The soybean meal is processed into the feed concentrate by the use of hammer mill, feed mixer and pellet mill. Ten analyses for GMO content have been performed by establishing the influence of the origin on the GMO content; the average percentage of GMO in the soybean meal was 0,3%. Findings: In two cases the results of analyses of the soybean meal were negative, which means that the soybean meal did not contain any GMO; in eight cases the test was positive, but none exceeded the sill of 0,9%. Irrespective of the supplier or origin the average percentage of the GMO in soybean meal is approximately identical, i.e., 0,3%. Only the soybean meal, arriving from Brazil, has a smaller percentage of the GMO, i.e., 0,22%. It means that not the supplier, but only the origin has an influence on the percentage of the GMO in soybean meal. Research/limitations/implications: The research has been performed on soybean meal, arriving from Brazil and Hungary, where ten analyses for GMO content have been performed. Practical implications: On the average, the soybean meal coming from Hungary contains more GMO, i.e., 0,3%, than the soybean meal coming from Brazil, which contains 0,22%. Originality/value: The research showed that most soybean meal were genetically modified, but in no case the limit prescribed by the regulations, i.e., 0,9% was exceeded.
5
Content available remote Manufacturing of mass-scale products from structural microalloyed steels in integrated production lines
Adamczyk J.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
|
Vol. 20, nr 1-2
399-402
EN
Purpose: Technical-economic aspects of the introduction of integrated technological lines for the production of metallurgical products are presented in the work. They have a special importance for microalloyed steels used in different branches of the industry. Design/methodology/approach: The analysis was carried out on a basis of requirements concerning hot-working of microalloyed steels with high mechanical properties produced by the use of the controlled rolling and thermo-mechanical processing. Findings: A modification of some well-known integrated lines consisting in the introduction of the cooling machine between roughing and finishing trains, instead of reheating machine gives a possibility to realize a controlled rolling. Moreover, using retention shields makes possible to manufacture the products by the thermo-mechanical processing. Research limitations/implications: There is a necessity to adjust technological parameters to precise controlling a course of material processes. Practical implications: Development of demands concerning integrated lines enabling to realize the controlled rolling and thermo-mechanical processing. Originality/value: Manufacturing mass-scale products from microalloyed steels in integrated energy-saving lines.
6
Content available remote Analysis of quality of sowing by pneumatic sowing machines for sugar beet
Mursec B., Vindis P., Janzekovic M., Cus F., Brus M.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
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Vol. 22, nr 1
85-88
EN
Purpose: The paper presents two sowing machines for interval sowing, differing in the mode of operation. The pneumatic vacuum sowing machine OLT and the pneumatic pressure sowing machine Aeromat - Becker for sowing sugar beet are compared. We were interested in adequacy of sowing at different working speeds. The purpose of the paper is to find out the optimum working speed for the individual sowing machine. Design/methodology/approach: The measurements were performed with two sowing machines which are most widely used in Slovenia; the sowing machines were tested in completely identical conditions at different speed of sowing. Findings: The parameters such as working efficiency, depth of sowing, inter-row distance and distance between seeds in the sowing row were measured and calculated. Research limitations/implications: Cultivation of sugar beet depends primarily on expert and technically correct sowing. Distance between seeds in the sowing row must enable the plants to have optimum conditions for their growth and development. For successful sowing it is necessary to know adequacy of the soil for sowing, technical properties of the sowing machine and biotechnical characteristics of the seed. Practical implications: Sowing machines and expertly performed sowing are of great importance for cultivation of sugar beet. The principal aim of the paper is to establish whether the higher working speed influences the quality of sowing. The test were aimed at defining the most suitable sowing speed for both sowing machines on the basis of measured data. Cultivation of sugar beet requires much money invested and work performed per unit of area. It is very important for the producers to be well familiarized with all agro - technical measures. Originality/value: Taking into account all measured parameters the optimum sowing speed of the pneumatic vacuum machine OLT is 8 km/h and the optimum sowing speed of the pneumatic pressure sowing machine Aeromat - Becker is 10 km/h.
7
Content available remote Accuracy of calculation of body mass on the basis of measurements
Janzekovic M., Brus M., Mursec B., Cus F.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
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Vol. 23, nr 2
47-50
EN
Purpose: The results of measurements shows that the chest size is not enough accurate to establish the body mass of living animals in all development stages, therefore additional measuring of the trunk length was used to increase reliability of the estimate. Design/methodology/approach: During the test 30 fattened animals were considered and were weighed by electronic weighing device EC 2000. The trunk length (d) and the chest size (o) were measured simultaneously. The body mass (T) was calculated according to the equation: T = o x d / 50. By the statistical package SPSS 12.01. for Windows the basic statistics for the studied properties was calculated. By the t-test the calculated and the actually weighed body masses of animals were compared. Findings: On the young fattened cattle it was established that with 240 - 290 kg body mass, when the body form is most rectangular, the accuracy of calculation on the basis of measured body parts, is the greatest. The percentage difference between weighed and calculated body mass is only 0.06%, which is very accurate. Research limitations/implications: For wide applicability of measurement results on the living animals in all stages of growth it would be necessary in the equation for the calculation to include also the trunk size in the middle of the body and the size in the rear part. Practical implications: On small farms where the cost of purchase of the digital weighing device would be too great a burden, thus, measuring of the chest size at 3 cm behind the elbow joint, in the middle of the trunk (behind the last rib), and measuring of the size in the rear part of the body and the trunk length from the middle of the withers to the tail root are more appropriate. Originality/value: The animals which phenotypically feature cylindrical shape in the period of growth can be measured most simply in the front middle and rear part of the body and, then, their body mass can be determined very accurately on the basis of the data obtained.
8
Content available remote Problemy dokładności i odbioru maszyn i urządzeń technologicznych.
Łunarski J., Ciepiela K.
Technologia i Automatyzacja Montażu
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2002
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nr 2
14-16
9
Content available remote Pneumohydrauliczne napędy w specjalnych urządzeniach technologicznych.
Lenczewski J., Łunarski J.
Technologia i Automatyzacja Montażu
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1998
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nr 2
6-9
10
Content available remote Organizacja skutecznego wykorzystania mocy produkcyjnych przedsiębiorstw montażowych.
Pietrowicz J.
Technologia i Automatyzacja Montażu
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1998
|
nr 3
20-22
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