Wyniki wyszukiwania - BazTech

1

A comparative thermal analysis of two workpiece materials of different machinability when turning based on IR thermography

Uhrynski Andrzej, Nurkusheva Saltanat, Usserbayev Muratbek, Hyla Pawel, Bembenek Michał

Journal of Machine Engineering

|

2024

|

Vol. 24, No. 1

50--59

EN

The comparative thermography analysis of temperature during machining by turning was presented. For the tests cast iron EN-GJL 250 and stainless steel 1.4301 were used. The machining by turning was performed with the TNMG 220408HS PC9030 and TNMA 220208 NC6210 cutting inserts design for machining that kind of materials. The temperature was measured on the machined material and on the surface of the cutting insert. The temperature distribution was performed during 3 subsequent turning passes; therefore, the coolant was not used during machining. The emissivity of TNMG 220408HS PC9030 and TNMA 220208 NC6210 cutting inserts was performed. In the case of EN-GJL-250 cast iron, the tests have shown that due to safety reasons (the lack of the safety cover in the working area of the lathe) it was impossible to perform the measurements at the highest assumed machining speed of 339.1 m/min. The higher average temperatures in the material were recorded for 1.4301 steel, even though the machining process was performed at a much lower machining speed than in the case of EN-GJL-250 cast iron. The average cutting insert temperature when turning EN-GJL-250 cast iron was approximately 100°C higher than for 1.4301 steel.

2

Comparative study of experimental thermographic data and finite element analysis on temperature evolution of PET-G layer deposition during additive manufacturing process

Kowalski Łukasz, Bembenek Michał, Uhryński Andrzej, Bajda Szymon

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2024

|

Vol. 72, nr 1

art. no. e147926

EN

Additive manufacturing (AM) technologies have been gaining popularity in recent years due to patent releases – and in effect – better accessibility of the technology. One of the most popular AM technologies is fused deposition modeling (FDM), which is used to manufacture products out of thermoplastic polymers in a layer-by-layer manner. Due to the specificity of the method, parts manufactured in this manner tend to have non-isotropic properties. One of the factors influencing the part’s mechanical behavior and quality is the thermoplastic material’s bonding mechanism correlated with the processing temperature, as well as thermal shrinkage during processing. In this research, the authors verified the suitability of finite element method (FEM) analysis for determining PET-G thermal evolution during the process, by creating a layer transient heat transfer model, and comparing the obtained modelling results with ones registered during a real-time process recorded with a FLIR T1020 thermal imaging camera. Our model is a valuable resource for providing thermal conditions in existing numerical models that connect heat transfer, mesostructure and AM product strength, especially when experimental data is lacking. The FE model presented reached a maximum sample-specific error of 11.3%, while the arithmetic mean percentage error for all samples and layer heights is equal to 4.3%, which the authors consider satisfactory. Model-to-experiment error is partially caused by glass transition of the material, which can be observed on the experimental cooling rate curve after processing the temperature signal.

3

Study of parameters of the mixture and heat generation of the dd15 diesel engine of the sandvik lh514 loader in the process of using alternative fuels based on rme

Bembenek Michał, Melnyk Vasyl, Mosora Yurii

Acta Mechanica et Automatica

|

2024

|

Vol. 18, no. 2

169--176

EN

Today, there is a growing shortage of commercial motor fuels in the world. This is due to the tendency to regulate the extraction of hydrocarbons, which are the main raw materials for their production; and, therefore, to reduce the import of oil, alternative types of fuel for diesel engines based on oils and animal fats are becoming widespread today. In this regard, intensive work is underway to convert internal combustion engines to biofuel-based ones both in countries with limited fuel and energy resources and in highly developed countries that have the opportunity to purchase liquid energy carriers. Biodiesel fuel (biodiesel, PME, RME, FAME, EMAG, etc.) is an environmentally friendly type of biofuel obtained from vegetable and animal fats and used to replace petroleum diesel fuel. According to the results of modelling, in the process of using RME B100 biodiesel fuel, we found a reduction in nitrogen dioxide emissions by 21.5% and a reduction in soot emissions by 34.5%. This will positively affect the environmental performance of the Sandvik LH514 loader, which is especially relevant in closed environments such as mines. So, according to the results of studies of the operation of the DD15 engine of the Sandvik LH514 loader on commercial and RME B100 biodiesel fuel, it was established that the use of biodiesel fuel leads to a deterioration of the mixture, due to which heat generation is reduced and, as a result, fuel consumption increases and engine power decreases, but the aspect of environmental indicators constitutes the significant improvement demonstrated by the present work.

4

On the Wear Mechanism of High-Chromium Gyratory Crusher Mantle Lining in Terms of the Assessment of the Used Material

Bembenek Michał, Krawczyk Janusz, Zagórski Krzysztof, Pawlik Jan

Tribologia

|

2023

|

nr 1

27--40

EN

After the rock is excavated in bulky chunks, it must be processed into fractions usable by diverse branches of industry. There are many approaches to achieving a fine aggregate, and the gyratory crusher is often preferable. Alas, since its working surfaces are subjected to heavy loads of abrasive material, the lining of the gyratory crusher is prone to specific geometry degeneration mechanisms. The authors subjected the mantle lining to a series of tests, such as metallurgical microstructure analysis, chemical composition and hardness evaluation and X-ray examination. Although most mantles are manufactured from the high-manganese Hadfield steel family, the lining was fabricated from high-chromium hypoeutectic white cast steel with a white iron structure. The difference in the chosen material's chemical composition resulted in an uncommon wear mechanism with visible inclined craters emerging in the lower part of the cone, where erosive, dynamically-moving particles were concentrated.

PL

Po wydobyciu skały w dużych kawałkach wymaga ona przetworzenia na frakcje nadające się do wykorzystania przez różne gałęzie przemysłu. Istnieje wiele sposobów na uzyskanie drobnego kruszywa, a kruszarka stożkowa jest często preferowaną opcją. Niestety, jej powierzchnie robocze poddawane są dużym obciążeniom ściernym, co skutkuje tym, że wykładzina kruszarki stożkowej jest podatna na specyficzne mechanizmy degeneracji geometrii. Autorzy poddali wyłożenie stożka szeregowi badań, m.in. analizie mikrostruktury, ocenie składu chemicznego, rentgenowskiej analizie fazowej i twardości w odniesieniu do właściwości tribologicznych na podstawie analizy mechanizmu zużycia. Większość stożków jest wykonywana ze stali wysokomanganowej rodziny Hadfielda, w tym przypadku wyłożenie zostało wykonane z wysokochromowej, podeutektycznego staliwa o strukturze odpowiadającej żeliwu białemu. Zastosowany materiał spowodował występowanie charakterystycznego mechanizmu zużycia w postaci tworzenia się kraterów, gdzie zużycie erozyjne koncentruje się w dolnej części stożka, przy której koncentruje się oddziaływanie większych dynamicznie przemieszczających się cząstek.

5

The role and importance of risk assessment in machinery design and control systems on the example of a model research line designed for the production of low-emission composite fuel

Kozłowski Artur, Smyła Jarosław, Bembenek Michał, Wojtas Piotr, Kasprzyczak Leszek

Journal of KONBiN

|

2023

|

Vol. 53, iss. 1

25--45

EN

The article discusses the construction and functionality of a modular line for the production of low-emission composite fuel, which was developed as part of a project cofinanced by European Funds, the aim of which was to develop an ecological, composite solid fuel intended for low and medium power boilers. The designed and built innovative production line has been tested in terms of safety requirements in accordance with the Machinery Directive 2006/42/EC. Based on the harmonized standards, the risk estimation algorithm was selected. The assessment covered, inter alia, mechanical, electrical and thermal hazards, hazards related to noise and processed material, and those related to control systems that perform safety functions. In order to eliminate non-conformities, technical and organizational measures increasing the safety of service were proposed.

PL

W artykule omówiono budowę i funkcjonalność modułowej linii do wytwarzania niskoemisyjnego paliwa kompozytowego, która została opracowana w ramach projektu dofinansowanego z Funduszy Europejskich, którego celem było opracowanie ekologicznego, kompozytowego paliwa stałego przeznaczonego do kotłów małej i średniej mocy. Zaprojektowana i zbudowana innowacyjna linia produkcyjna została sprawdzona pod kątem wymagań bezpieczeństwa według Dyrektywy Maszynowej 2006/42/WE. Na podstawie norm zharmonizowanych dokonano wyboru algorytmu szacowania ryzyka. Ocenie podlegały m.in. zagrożenia mechaniczne, elektryczne, termiczne, zagrożenia związane z hałasem i przetwarzanym materiałem oraz dotyczące systemów sterowania realizujących funkcje bezpieczeństwa. W celu eliminacji niezgodności zaproponowane zostały techniczne i organizacyjne środki podnoszące bezpieczeństwo obsługi.

6

A Novel Approach to the Screw Feeder Design to Improve the Reliability of Briquetting Process in the Roller Press

Baiul Kostiantyn, Vashchenko Serhii, Khudyakov Olexander, Bembenek Michał, Zinchenko Andrii, Krot Pavlo V., Solodka Nataliia

Eksploatacja i Niezawodność

|

2023

|

Vol. 25, no. 3

art. no. 167967

EN

The screw feeder design for the pre-compaction of bulk materials to be briquetted in a roll press is considered to increase the overall reliability. The relationship between the parameters of the screw feeder and its technological characteristics is investigated by the example of two fine-grained materials. A new mathematical model and design algorithm have been developed, which takes into account the properties of materials, the roller press parameters, the shape of the briquettes, and their deformation after compaction. The relationship between the pre-compaction pressure and the material stack height at the inlet is determined. The relations between the torque, the screw pitch, and the material stack height above the inlet, as well as the drive power and the screw pitch on productivity, are investigated. In experiments, using the proposed design, the compaction ratio of the peat increases by 22-27%, and hydrolyzed lignin –by 14-17%. The proposed approach allows for preventing drive overloading and ensures the reliable operation of pre-compaction devices for the roller presses.

7

Tribology Characteristics of Heatproof Alloys at a Dynamic Pin Ladening in the Variable Temperature Field

Bembenek Michał, Tsyganov Volodymyr, Sakhniuk Nataliia, Lazarieva Olha, Machnik Ryszard, Ropyak Liubomyr

Advances in Science and Technology. Research Journal

|

2023

|

Vol. 17, no 5

140--152

EN

An analysis of the operating conditions of gas turbine engines, their components, and the destruction causes was carried out. The designer problems of tribo-joints operating under difficult conditions of force and temperature loads are singled out. The study aimed at obtaining the comparable quantitative dependences of blade material wear, taking into account the role of both cyclical changes in the temperature of the gas flow under the conditions close to real ones, and their frictional characteristics. Deformable heat-resistant nickel alloys and foundry heat-resistant nickel alloys from which T-shaped samples were made, were chosen for the research. The tests were carried out on the developed gas dynamic stand, which simulates the working conditions of the bandage joints of the bladed turbomachines of gas turbine installations. The intensity of wear was determined as the ratio of the worn material volume to the number of load cycles under different temperature conditions. The wear resistance of three-way connections operating under the conditions of non-stationary thermal loads and fluctuations in the contact was considered. It was shown that thermal cycling leads to a decrease in the wear resistance of heat-resistant nickel alloys by 2–3 times and depends on the average temperature of the cycle. It was found that resistance to the wear, and also the character of change of coefficient of friction is mainly determined by the terms of education and destruction of the protective superficial layer. Basic factors managing tribology processes in the zone of contact were determined.

8

Investigation of the Impact of Face Milling Parameters on the Roughness of the Machined Surface for 1.4301 Steel

Bembenek Michał, Dzienniak Damian, Dzindziora Agnieszka, Sułowski Maciej, Ropyak Liubomyr

Advances in Science and Technology. Research Journal

|

2023

|

Vol. 17, no 4

299--312

EN

The objective of this research was to analyze how different milling parameters impact the roughness of the surface produced during the machining process. Kinematic parameters, such as cutting speed and feed per tooth, as well as geometric parameters, such as axial and radial depth of machining, were considered in various configurations to determine which one had the greatest impact on the surface quality of 1.4301 stainless steel (also known as AISI 304, among other designations). This type of steel is commonly used in a number of industries, such as construction, automotive, food, chemical, decoration, oil, and petrochemical, owing to its favorable properties. It is also relatively cheap. The analyzed roughness parameters included Ra, Rq, Rz, Rt, which, considered collectively, provide a comprehensive picture of the overall surface quality. Based on the results, feed per tooth is the one parameter that was to a large degree responsible for the overall quality roughness of the surface of the analyzed samples. The remaining tested parameters also had an impact on the surface quality, which resulted in a dynamic increase or decrease in roughness (extremes), but not to the same degree as in the case of feed per tooth. At one point, for a relatively low axial depth of cut, a sudden increase in the resulting roughness was recorded.

9

Experimental and Numerical Characterization of Thermal Bridges in Windows

Smusz Robert, Bałon Paweł, Kiełbasa Bartłomiej, Rejman Edward, Bembenek Michał, Kowalski Łukasz

Advances in Science and Technology. Research Journal

|

2023

|

Vol. 17, no 1

315--331

EN

Actions aimed at improving the energy performance of buildings increase the share of heat loss through thermal bridges and windows in a building’s energy balance. This is especially true of buildings currently under construc- tion. In addition, it is known that the correct installation of windows is one of the biggest obstacles that must be overcome in order to achieve higher energy efficiency and reduce the impact of linear thermal bridges. Therefore, the study analysed, numerically and experimentally, the energy properties of PVC window frames with improved metal stiffening profiles, which were introduced to reduce the risk of window frame deformation and reduce leakage caused by faulty installation. The value of the frame thermal transmittance coefficient and the linear heat transfer coefficients were determined numerically. The simulation results showed that filling large air spaces with insulation material allowed for the reduction of the Uf frame’s thermal transmittance coefficient by over 10%. Moreover, where the window connects with the wall, there was a reduction in the linear thermal bridges’ influence on heat losses. The reduction in the linear thermal transmittance coefficient Ψ was 9.6%, 1.0%, and 3.5% for the window sill, jamb, and lintel, respectively, compared to a frame without insulation. Moreover, experimental studies were conducted on the influence of the insulation of the PVC window frame with metal closed stiffening profiles on the linear thermal bridge located at the joint with the glass. It was found that the incidence factor Itb decreased by more than 6%. Thus, there is also a positive effect on the linear thermal bridge at the joint of the glass pane with the window frame.

10

Badanie możliwości wytwarzania przyjaznego środowisku kwalifikowanego paliwa kompozytowego dla okresu przejściowego w sektorze komunalno-bytowym w Polsce

Bembenek Michał, Dzik Tomasz, Smyła Jarosław, Wojtas Piotr

Przemysł Chemiczny

|

2022

|

T. 101, nr 3

191--196

PL

Przedstawiono wyniki wstępnych badań laboratoryjnych dotyczących możliwości wytworzenia w prasie walcowej mikrobrykietu o właściwościach proekologicznych. Wykazano, że z nieużytecznej klasy ziarnowej węgla o frakcji < 5 mm powstającej w produkcji ekogroszku można uzyskać wartościowe paliwo proekologiczne. Brykiety o objętości 1 i 2 cm3 wytwarzane są z węgla rozdrobnionego o granulacji < 2 mm, zmieszanego z dodatkami katalizującymi i/lub sorbentami oraz lepiszczem. Odpowiednio na- wilżona mieszanka poddana jest formowaniu i zagęszczeniu w prasie walcowej. Następnie wytworzone brykiety są suszone do wilgotności końcowej ok. 7% mas. Wstępne wyniki badań wskazały, że tak wytworzone paliwo kompozytowe wykazuje lepsze właściwości eksploatacyjne niż węgiel lub drewno i powinno stanowić bardzo dobry substytut ekogroszku.

EN

Blends of bituminous coal (grain class of < 5 mm reduced to < 2 mm) with additives (catalyst, sorbent and wheat or rye binder) were briquetted in lab. roller press. The produced briquettes were dried to the final moisture of about 7% and analyzed for compressive strength, breakability, water sorption as well as CO, NOx, VOC, PM2.5 and PM10 emissions during the combustion process. Composite fuel showed better operational properties than the traditional eco-pea coal, and its use could reduce CO2 emissions.

11

Comparative analysis of combustion of qualified composite fuel for the transitional period in the household and communal sector in Poland

Bembenek Michał, Dzik Tomasz, Smyła Jarosław, Kozłowski Artur, Wojtas Piotr

Management Systems in Production Engineering

|

2022

|

nr 4 (30)

Bibliogr. 40 poz., rys., tab.

EN

The article presents the results of laboratory combustion tests of the microbriquette obtained from useless coal (grain class of < 5 mm) generated in the production of “eco-pea” (eko-groszek) coal. The briquettes of 1.5 and 2.5 cm3 were made in a roller press of crushed coal granulation down to 2 mm, mixed with a binder and/or catalytic additives and sorbents, then dried to final moisture of about 7%. The tests were carried out on a specially designed stand enabling to determine the differential curve of the weight loss of samples heated to the ignition temperature and then burnt with laminar airflow by natural chimney draft. Comparative tests were carried out with ecopea coal from the “ZG Sobieski” mine. The results indicate that composite fuels, in the form of microbriquette, ignite faster, burn at a higher temperature and leave less ash when burned than lump coal. The greater reactivity of the briquette concerning the lump coal allows for minimizing the air rate by about 10%, which also reduces the exhaust gas volume by the same amount and the stack losses. It reduces the velocity of dust lifting, which leads to the reduction of their emission.

12

The use of thermography to determine the compaction of a saddle-shaped briquette produced in an innovative roller press compaction unit

Bembenek Michał, Uhryński Andrzej

Acta Mechanica et Automatica

|

2022

|

Vol. 16, no. 4

340--346

EN

The unit compacting pressure in the fine-grained material consolidation process in the roller press can reach >100 MPa and is a parameter that results, among other things, from the properties of the consolidated material and the compaction unit geometry. Achieving the right pressure during briquetting is one of the factors that guarantee the proper consolidation and quality of briquettes. The distribution of the temperature on the surface of the briquettes correlates with locally exerted pressure. The present work aimed to analyse the bri-quetting process of four fine-grained materials in a roller press equipped with saddle-shaped briquette-forming rollers based on images ob-tained from the thermography conducted immediately after their consolidation. The tests were carried out in a roller press that was equipped with forming rollers of 450-mm diameter and having a cavity with a volume of 4 cm3, as described by patent PL 222229 B1. Two mixtures of hydrated lime with 9.1 wt% and 13.0 wt% water, a mixture of scale and a mixture of electric arc furnace (EAF) dust were used for the tests. In most mixtures, the highest temperatures were achieved in the middle-upper part of the briquettes. The briquettes from the EAF dust mixture heated locally the most on the surface up to 37.7 °C. The difference between the maximum briquette temperature and the ambient temperature was 20.2 °C.

13

Brykietowanie jako proces przygotowania do utylizacji drobnoziarnistych odpadów przemysłu hutniczego

Bembenek Michał

Hutnik, Wiadomości Hutnicze

|

2021

|

Vol. 88, nr 1

11--13

PL

Jednym z ważniejszych problemów w przemyśle hutniczym jest racjonalne zagospodarowanie odpadów. Wykorzystanie brykietowania do utylizacji m.in pyłów i szlamów powstających w przemyśle hutniczym jest procesem umożliwiającym uzyskanie z nich komponentów wsadu pieców hutniczych, bądź stalowniczych. W artykule przedstawiono przegląd możliwości utylizacji lub zawrócenia do technologii macierzystej poprzez brykietowanie w prasach walcowych wielu odpadów hutniczych.

EN

One of the most important problems in the steel industry is rational waste management. The use of briquetting for the waste as dust and sludge generated in the metallurgical industry, is a process that allows to obtain good components for the metallurgical or steel furnaces. The article presents an overview of the possibility of recycling or returning to the main technology by briquetting many metallurgical wastes in the roller presses.

14

Wytwarzanie granulowanego nawozu mineralnego z odpadowego gipsu w granulatorze z płaską matrycą

Bembenek Michał, Wdaniec Paweł, Baran Ewa

Przemysł Chemiczny

|

2020

|

T. 99, nr 2

236--238

PL

Przedstawiono wyniki badań procesu wytwarzania nawozu mineralnego w formie granul o rozmiarze ziarna 2–6 mm z odpadowego gipsu z instalacji odsiarczania spalin w granulatorze z płaską matrycą. W badaniach testowano różne lepiszcza w celu prawidłowego scalenia aglomeratów. Otrzymane granulaty badano pod kątem wytrzymałości na nacisk oraz rozkładu w wodzie.

EN

Gypsum from flue gas desulfurization was granulated to grains 2–6 mm in a granulator with a flat matrix by using various binders. The obtained granules showed satisfactory compression strength and resistance in water.

15

Assessment of the technical level of magnetic fishing tools

Romanyshyn Taras, Romanyshyn Liubomyr, Bembenek Michał, Mokhnii Ihor

Management Systems in Production Engineering

|

2020

|

nr 2 (28)

78--83

EN

A variety of magnetic fishing tools poses the task of the optimal choice of tool for eliminating accidents during the construction, operation and repair of wells. Existing criteria for assessing the quality of fishing magnets are characterized by the complexity of the determination and the ambiguity of the results. Therefore, the aim of research is development of a new approach to determining the technical level of fishing tools of various types and designs. A complex criterion has been developed that allows to evaluate the technical level of magnetic systems by correlating the actual and theoretical values of the total and specific lifting forces. Also it has been carried out a qualimetric analysis of magnetic tools, which are currently offered by world manufacturers. As a result, mathematical models are found that describe the average and modern world level of devices with specific lifting force. Technical decisions are proposed, the implementation of which in the design of magnetic systems of fishing tools will allow to achieve high values of lifting force. Application of the proposed complex criterion along with the results of qualimetric analysis will make it possible to objectively assess the technical level of magnetic fishing tools both at the design stage and during serial production.

16

FEM analysis of working conditions on the stress and strain of low-capacity disc granulator frames

Bembenek Michał, Jankowicz Karol

Computer Methods in Materials Science

|

2020

|

Vol. 20, No. 2

47--62

EN

The common practice of frame selection is a simplified way without calculations of the strength and strain conditions. It is particularly popular in the design of small devices. In the case of granulation in a disc granulator, it is necessary to experimentally determine the correct parameters of the process. Therefore, the disc granulator must operate with a wide range of settings of the inclination of the granulator disc axis in relation to the ground. The use of the granulator for laboratory purposes requires also taking into account the loads resulting from its mobility. In response to this the FEM analysis was carried out as to the effect of the working disc position angle on stresses occurring in the laboratory disc granulators LDG300 and DG750 frame. Additionally, analyses of the stresses of the granulator’s frames during their lifting and displacing were done. The analyses allowed the researchers to identify the main load that affects the frame design most markedly.

PL

Powszechną praktyką konstrukcji ram urządzeń technologicznych jest ich uproszczony dobór bez obliczania warunków wytrzymałości i sztywności. Jest ona szczególnie popularna przy projektowaniu małych urządzeń. W przypadku granulacji w granulatorze talerzowym konieczne jest eksperymentalne określenie prawidłowych parametrów procesu. Dlatego granulator talerzowy musi pracować w szerokim zakresie kątów nachylenia osi talerza granulatora względem poziomu. Wykorzystanie granulatora do celów laboratoryjnych wymaga również uwzględnienia obciążeń wynikających z jego mobilności. W odpowiedzi na to przeprowadzono analizę MES dotyczącą wpływu kąta pochylenia osi granulatora podczas jego pracy na naprężenia występujące w ramie laboratoryjnych granulatorów talerzowych LDG300 oraz DG750. Dodatkowo przeprowadzono analizy naprężeń ramy granulatora podczas jej podnoszenia i przemieszczania. Analizy pozwalają zidentyfikować najważniejsze obciążenia mające wpływ na prawidłowe obliczenia ram w celu uniknięcia ich przewymiarowania.

17

Wpływ rodzaju kruszarki oraz parametrów jej pracy na suchą granulację proszków

Bembenek Michał, Wdaniec Paweł

Przemysł Chemiczny

|

2019

|

T. 98, nr 2

310--313

PL

Granulacja dwustopniowa jest obecnie jednym z procesów aglomeracji ciśnieniowej, dzięki któremu można otrzymywać z materiału drobnoziarnistego granulat o określonym uziarnieniu. Dzięki swoim niewątpliwym zaletom zyskała ona uznanie w przemyśle chemicznym, farmaceutycznym oraz spożywczym. Na uzyskany w procesie końcowy rozmiar ziarna oddziałuje wiele czynników. Przedstawiono wpływ rodzaju urządzenia rozdrabniającego i jego parametrów konstrukcyjno-procesowych na uziarnienie materiałów po rozdrobieniu. Ze względu na to, że badania prowadzono pod kątem procesu granulacji dwustopniowej, materiałami poddawanymi rozdrabnianiu były surowce drobnoziarniste, wcześniej scalone do postaci kawałkowej przy użyciu prasy walcowej.

EN

Five powdered materials (various prodn. wastes, lime, graphite) were preliminarily consolidated with a roll press, then grounded in a hammer crusher or disintegrato. The yield of 0-1.5 mm powder fraction after crushing increased with increasing impact velocity in all cases. The final briquettes showed mech. strength 12.38-28.9 N/g except for graphite (104.95 N/g).

18

The use of computer image analysis in determining material flow in the roller press compacting unit during compacting of fine-grained material

Bembenek Michał

Computer Methods in Materials Science

|

2018

|

Vol. 18, No. 2

58--63

EN

Mechanisms of fine-grained material flow in a roller press are a constant subject of research. The proper transfer of feed in the feeder has a significant influence on the correct course of the compaction and consolidation process, product quality, and the intensity of wear of the forming components. A few mathematical models of compaction process have been put forth, but they are focused mainly on loads in the compacting unit and consolidated material properties. During compaction the loose material properties including the Young module, the external and internal friction coefficient, and the side pressure coefficient change continuously. Therefore visualisation tests were carried out to survey the flow of material in a compaction unit equipped with rollers with a flat working surface and gravity feeder. Using the NI Vision Builder program, the recorded video observations were analyzed and the medium speed distribution of the material in the feeder was determined. The results were presented in the form of graphs and compared with one another, specifying the relationship between the material speed distribution and the press operation parameters.