Wyniki wyszukiwania - BazTech

1

Badania stanowiskowe i eksploatacyjne innowacyjnego bębna mieszalnika

Bernaczek Jacek, Fudali Paweł, Kalandyk Anita, Koperski Mateusz, Nagnajewicz Marek

Przegląd Techniczny : Gazeta Inżynierska

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2022

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nr 11

24--27

PL

Publikacja obejmuje opracowanie konstrukcji oraz badania stanowiskowe i eksploatacyjne innowacyjnego bębna mieszalnika hydraulicznej betonomieszarki samochodowej o pojemności 9m3 . Przeprowadzono złożony proces projektowania poszczególnych elementów płaszcza bębna mieszalnika oraz spirali mieszająco-rozładowującej. Opracowano dobór i analizę materiałową dla przedmiotowego zespołu. Na podstawie wybranych materiałów wstępnych opracowano technologię wytwarzania prototypowych mieszalników. Innowacyjne bębny poddano badaniom na stanowisku autorskiej konstrukcji. Ostatnim etapem realizacji projektu były badania eksploatacyjne mieszalników w warunkach rzeczywistych. Podsumowanie stanowi analiza oraz opracowanie wyników badań.

EN

The publication covers the development of the structure as well as bench and operational tests of an innovative drum ofa hydraulic truck mixer with a capacity of 9m3 . A complex process of designing individual elements of the mixer drum shell and the mixing-unloading spiral was carried out. The selection and material analysis for the team in question was developed. Based on the selected initial materials, a technology for the production of prototype mixers was developed. Innovative drums were tested on the stand of an original design. The last stage of the project implementation was the exploitation testsof mixers in real conditions. The summary is the analysis and preparation of the research results.

2

Initial Analysis of the Surface Layer of AVGI Cast Iron Subject to Abrasion

Jakubus Aneta

Archives of Foundry Engineering

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2022

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Vol. 22, iss. 2

50--56

EN

The article presents the results of research on the abrasion resistance of cast iron with vermicular graphite in the as-cast state and after austempering (the latter material is referred to as AVGI – Austempered Vermicular Graphite Iron). Austenitization was carried out at the temperature values of either 900°C or 960°C, and austempering at the temperature values of either 290°C and or 390°C. Both the austenitization and the austempering time was equal to 90 minutes. The change of the pearlitic-ferritic matrix to the ausferritic one resulted in an increase in mechanical properties. Abrasion tests were conducted by means of the T-01M pin-on-disc tribometer. The counter-sample (i.e. the disc) was made of the JT6500 friction material. Each sample was subject to abrasion over a sliding distance of 4000 m. The weight losses of both samples and counter-samples were determined by the gravimetric method. It was found that the vermicular cast iron austenitized at 900°C and austempered at 290°C was characterized by the lowest wear among the evaluated cast iron types. The geometric structure of the surface layer after the dry friction test exhibited irregular noticeable grooves, distinct oriented abrasion traces, plastic flow of the material, microcracks, and pits generated by tearing out the abraded material. The largest surface roughness was found for the AVGI cast iron heat-treated according to the variant 3 (Tγ =900 ºC; Tpi = 390°C), while the smallest one occurred in AVGI cast iron subject to either the variant 2 (Tγ =960 ºC; Tpi = 290°C) or the variant 4 (Tγ =900 ºC; Tpi = 290°C) of heat treatment and was equal to either 2.5 μm or 2.66 μm, respectively. It can be seen that the surface roughness decreases with the decrease in the austempering temperature.

3

The effects of Nano SiO2 and Silica Fume on the properties of concrete

Tran Huu-Bang, Phan Vu To-Anh

Archives of Civil Engineering

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2022

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Vol. 68, nr 2

391-407

EN

This study investigates the effects of Nano SiO2 (NS) and Silica fume (SF) on the mechanical properties and durability of Portland cement concrete. On specimens with varying NS and SF concentrations, compressive strength, flexural strength, abrasion resistance, elastic modulus, and chloride ion penetration were all tested. All specimens were subjected to the proposed method/technique cured at the ages of 3, 7, 28, and 60 days. NS particles were added to cement concrete at various replacements of 0, 0.5, 1.0, 1.5, and 2.0% by the mass of the binder. The water/binder ratio has remained at 0.37 for all mixes. Then, for cement-concrete were prepared 45 MPa (C45) with NS and SF. The specimens confirm the new method effectiveness evaluation were prepared under two different categories: (1) Portland cement replacement with NS of 0%, 0.5%, 1.0%, 1.5%, and 2.0%, by weight for adhesives; (2) Portland cement replacement with NS of 0.5%, 1.0% and each NS content in combination with SF of 5%, 10%, and 15%, respectively, by weight for adhesives. The results indicated that the abrasion resistance and Chloride ion penetration of concrete containing NS and SF are improved. Finally, an analytical model for forecasting the Elastic modulus, flexural strength, and compressive strength of cement concrete was established from obtained data.

4

Ścieralność betonowych posadzek przemysłowych w technologii DST

Słonina Sławomir

Nowoczesne Hale

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2021

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Nr 1

42--47

PL

W artykule przedstawiono najistotniejsze informacje zawarte w aktualnej literaturze technicznej dotyczące ścieralności betonowych posadzek przemysłowych wykonywanych w technologii DST.

EN

The paper presents the most important information featured in the current technical literature about the abrasion resistance of concrete industrial DST floors.

5

Using FCAW with Electrodes Based on Fe-Ti-Mo-B-C System for Increasing of Durability of Junk Removal Tools

Ivanov Olexandr, Prysyazhnyuk Pavlo, Romanyshyn Liubomyr, Romanyshyn Taras, Mosora Yurii

Multidisciplinary Aspects of Production Engineering

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2021

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Vol. 4, Iss. 1

132--141

EN

In this work were analyzed factors and working conditions that leads to the wearing of junk mills tools that are a part of junk removal equipment used in drilling and workover of borehole. Such equipment is a part of oil and gas industry and work under condition of intense abrasive wearing with increased pressures and cyclic loads. Was established that traditional hardfacing materials based on the Fe-Cr-C system are not effective for improvement of abrasion resistance of elements of such equipment due to their low crack resistance and low hardness of chromium carbides. The aim of this work was to increase a durability of that equipment by using of flux cored electrodes with reaction components of pure metal powders, which leads to forming the fine-grained structure with increased hardness. Powders of Ti, Mo, B4C and their combinations were used. Structures of the hardfacing coatings were investigated by method of metallography, scanning electron microscopy (SEM). Abrasion wear tests were held under condition of fixed and non-fixed abrasion. Using of pure metal powders led to formation of a fine-grained structure with grains of Mo2FeB2 that forms around TiC, which work as modifier. It was investigated that the researched material based on Fe-Ti-Mo-C-B system that was used for increasing the wear resistance of junk mills led to increasing of the TBO period in 1.5-1.6 times comparing with serial hardfacing materials based on tungsten.

6

Performance Evaluation of Upholstery Fabric Developed from Recycled Fibres

Jamshaid Hafsa, Zahid Bilal, Rajput Abdul Waqar, Hussain Sajid, Hussain Uzair

Fibres & Textiles in Eastern Europe

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2021

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Vol. 29, no. 5 (149)

46--49

EN

The aim of this work was to investigate the properties of upholstery fabric produced from recycled hard waste of coloured fabric clippings. Mélange yarns were formed with the combination of red, green, black and yellow in different ratios. Five yarn samples of 5 Nec linear density were produced from each blend ratio using the rotor spinning technique. These yarns were used to develop fabric samples in a satin weave. These yarn and fabric samples were investigated for different quality parameters, especially the abrasion resistance, pilling resistance, absorbency and light fastness of the fabrics as per standard test methods. The abrasion test is important for the durability and longer-lasting performance of upholstery fabric. From the analysis of test results, it is concluded that all the serviceability properties are in a good range, and these fabrics can be used for waiting room area upholstery fabric.

PL

Celem pracy było zbadanie właściwości tkanin obiciowych wytworzonych z recyklingu odpadów kolorowych ścinków tkanin. Przędze melanżowe powstały z połączenia czerwonego, zielonego, czarnego i żółtego koloru w różnych proporcjach. Wytworzono pięć próbek przędzy z każdego stosunku mieszanki przy użyciu techniki przędzenia rotorowego. Przędze zostały wykorzystane do opracowania próbek tkanin. Następnie próbki przędzy i tkanin zbadano pod kątem różnych parametrów jakościowych, w szczególności odporności na ścieranie, odporności na pilling, chłonności i odporności na światło tkanin zgodnie ze standardowymi metodami badawczymi. Test ścieralności jest ważny z punktu widzenia trwałości tkaniny obiciowej. Z analizy wyników badań wynikało, że wszystkie właściwości użytkowe mieszczą się w dobrym zakresie, a tkaniny te mogą być stosowane jako tkaniny obiciowe.

7

Wybrane zagadnienia projektowania, wykonawstwa oraz użytkowania betonowych posadzek przemysłowych w aspekcie ich ścieralności

Świątek-Żołyńska Sylwia, Majewski Tomasz, Niedostatkiewicz Maciej

Przegląd Budowlany

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2020

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R. 91, nr 6

36--43

PL

Posadzki są elementem, którego stan techniczny wpływa zarówno na bezpieczeństwo użytkowania, jak również na komfort eksploatacyjny obiektu budowlanego. Jednym z najbardziej popularnych rozwiązań w zakresie betonowych posadzek przemysłowych są posadzki z impregnacją górnej powierzchni z zastosowaniem suchej posypki nawierzchniowej (DST – z ang. Dry Shake Topping). W następstwie błędów i niedociągnięć zarówno projektowych, jak i wykonawczych oraz niewłaściwej eksploatacji posadzki betonowe mogą ulegać przyśpieszonej dekapitalizacji. W artykule opisano najczęściej popełniane błędy przyczyniające się do nadmiernej ścieralności betonowych posadzek przemysłowych, których górna powierzchnia została zabezpieczona suchą posypką nawierzchniową oraz podano sposób ich usuwania. Przedmiot artykułu stanowi również dyskusja na temat współczesnych metod diagnostyki betonowych posadzek przemysłowych w zakresie oceny ich ścieralności.

EN

Floors are an element whose technical condition affects both the safety of use and the operational comfort of a building. One of the most popular solutions in the field of concrete industrial floors are floors with impregnation of the upper surface using dry topping (DST – Dry Shake Topping). As a result of errors and shortcomings in both design and execution, as well as improper operation, concrete floors may undergo accelerated decapitalization. The paper describes the most common mistakes contributing to excessive abrasion of industrial concrete floors whose upper surface has been secured with dry topping and a method of removing them. The subject of the paper is also a discussion on contemporary methods of diagnostics of concrete industrial floors in the scope of assessing their abrasion.

8

Wear Resistance Improvement of Equipment for Production of Building Ceramics by Hardfacing with Flux-Coerd Electrodes based on Fe-Ti-B-C System

Prysyazhnyuk Pavlo, Ivanov Oleksandr, Lutsak Dmytro, Lutsak Lyubomyr

Multidisciplinary Aspects of Production Engineering

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2020

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Vol. 3, Iss. 1

263--273

EN

In this work were analyzed factors that leads to wearing of equipment of production engineering, construction, oil and gas, woodworking, tillage industries. Was established that traditional hardfacing materials based on the Fe-Cr-C system are not effective for improvement of abrasion resistance of elements of equipment for production of ceramic building materials due to working conditions. The aim of this work was to increase a durability of that equipment by using of flux cored electrodes with reaction components that provide “in-situ” synthesis, which leads to fine-grained structure of refractory borides and carbides and their solid solutions with increased hardness. Powders of Ti, Mo, B4C and their combinations were used. Structure of the hardfacing coatings were investigated by method of metallography, scanning electron microscopy (SEM). Using of pure metal powders led to forming a fine-grained structure with refractory borides and carbides and their solid solutions. It was investigated that the offered material based on Fe-Ti-Mo-C-B system used for increasing the wear resistance of extruder-screw for production of ceramic building material can increase the TBO period in 2.2-2.4 times in comparison with serial hardfacing materials based on Fe-Cr-C system.

9

Comprehensive tests of sintered carbides in the aspect of conical picks operational life

Grzegorzek Wojciech, Jaszczuk Marek

Mining Science

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2020

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Vol. 27

119--131

EN

The results of tests on the brittle fracture and abrasive wear of conical picks sintered carbides taking into account the size of tungsten carbide grains and the content of cobalt are presented. The tests were carried out on the innovative laboratory stand for tribological tests using the method for determination of resistance to edge fracture and abrasive wear. Test results have shown that an increase in the size of tungsten carbide grains, and thus an increase in the cobalt content, reduces the wear resistance and increases the resistance to brittle fracture. The results of the tests of sintered carbides inserts in the aspect of their durability are presented.

10

Improvement of abrasion resistance of production equipment wear parts by hardfacing with flux-cored wires containing boron carbide/metal powder reaction mixtures

Ivanov Oleksandr, Prysyazhnyuk Pavlo, Lutsak Dmytro, Matviienkiv Oleh, Aulin Vicktor

Management Systems in Production Engineering

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2020

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nr 3 (28)

178--183

EN

In this work was established that serial traditional hardfacing materials based on the Fe-Cr-C system are not effective for improvement of abrasion resistance of elements of equipment for production of bricks, solid fuel briquettes and for restoration of augers, due to the fact that this equipment works at significant specific and cyclic loads. Features of the coarse-grained structure of Fe-Cr-C based coatings leads to intensive abrasive wear. The aim of this study was to increase a durability of that equipment by using of flux cored electrodes with reaction components of Ti, Cr, Mo, B4C and their combinations to provide synthesis, which leads to finegrained structure of refractory borides and carbides and their solid solutions with increased hardness. Structure of the hardfacing coatings were investigated by method of metallography, scanning electron microscopy (SEM), electron backscatter diffraction (BSD) mode and energy dispersive X-ray spectroscopy (EDS). Temperature dependences of equilibrium phase amount of the hardfacing materials were calculated by the CALPHAD technique, using JMatPro software. It was investigated that the offered materials are characterized by higher wear resistance at high specific and cyclic loads in comparison with serial production high-chromium hardfacing materials (Lastek, ESAB, Paton IEW). It was established that the abrasion wear resistance at high specific and cyclic loads depends mostly of formation of the structure of hardfacing material, and not the hardness. Also, using of powders of pure metals and their combination as reaction mixture for FCAW leads to fine structure which contains of refractory borides and carbides and their solid solutions.

11

Thermal analysis of matrix composite reinforced with Al2O3 particles

Włodarczyk-Fligier A., Polok-Rubiniec M., Konieczny J.

Journal of Achievements in Materials and Manufacturing Engineering

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2020

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Vol. 100, nr 1

5--11

EN

Purpose: The aim of this paper is to present a modern manufacturing method of production and compare the thermal, mechanical, properties of composite materials with aluminium alloy matrix reinforced by Al2O3 particles. Design/methodology/approach: The material for investigation was manufactured by the method of powder metallurgy (consolidation, pressing, hot concurrent extrusion of powder mixtures of aluminium EN AW-AlCu4Mg1 (A) and ceramic particles Al2O3). The amount of the added powder was in the range of 5 mass.%, 10 mass.% and 15 mass.%. Findings: The received results concerning the enhancement of hardness, which show the possibility of obtaining the MMC composite materials with required microstructure, influencing the properties of the new elaborated composite materials components. Concerning the thermal properties, especially the linear thermal expansion coefficient was measured, as well as the dilatometric change of the sample length was analysed. Practical implications: Concerning practical implications it can be stated that the tested composite materials can be applied among others in the transportation industry, but it requires additional research. Originality/value: The received results show the possibility of obtaining new composite materials with controlled and required microstructure with possible practical implications.

12

Research on Footwear Laces with Respect to Abrasion Resistance and Spontaneous Untying

Czaplicki Zdzisław, Rylski Adam, Serweta Wioleta, Strzelecki Stanisław

Fibres & Textiles in Eastern Europe

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2020

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Vol. 28, no. 3 (141)

23--26

EN

In this paper, two types of footwear laces research were undertaken. The first was connected with abrasion resistance and the second with the displacement force at the knot. The abrasion resistance was registered by the level of abrasion for standard eyelet. The displacement force was measured with the use of a tensile test machine, where the force and extension were registered. As a criterion of test evaluation, the maximum force was established when the knot was untied. The research was conducted for a set of different types of shoelaces (differing in shape, structure and raw materials). The evaluation criteria proposed can be used in order to determine the raw materials and optimal construction of shoelaces. From the user’s point of view, the measures identified i. e. the displacement force in the knot (Fpw) and abrasion resistance (Ks) are the most important factors.

PL

W pracy przedstawiono dwie metody badań sznurowadeł obuwniczych, dotyczące odporności na ścieranie i siły przesuwu w węźle. Odporność na ścieranie badano na specjalnie wykonanym stanowisku, w którym elementem ścierającym było standardowe oczko obuwnicze. Badania siły przesuwu sznurowadła w węźle wykonywano na zrywarce wyposażonej w urządzenie rejestrujące siłę i wydłużenie. Jako kryterium oceny przyjęto maksymalną siłę, przy której nastąpiło rozwiązanie węzła sznurowadła. Materiał badań stanowiły sznurowadła obuwnicze różniące się kształtem (strukturą) wykonane z różnych surowców. Zaproponowane kryteria oceny pozwalają na optymalne dobranie surowców i konstrukcji sznurowadeł obuwniczych. Wyznaczane wskaźniki tj. siła przesuwu sznurowadła w węźle (Fpw) i współczynnik odporności na ścieranie (Ks) stanowią najbardziej istotne wskaźniki z punktu widzenia użytkownika.

13

Properties of flame-powder sprayed aluminum coatings reinforced with particles of carbonaceous materials

Czupryński Artur

Welding Technology Review

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2019

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R. 91, nr 4

17--30

EN

The article presents the results of research on tribological properties of aluminum coatings, reinforced with particles of carbon nanotubes Nanocyl NC 7000 in quantities of 0.5 wt.% and 1 wt.% as well as carburite (elemental carbon) in an amount of 0.5 wt.%, flame-powder sprayed on a non-alloy structural steel grade S235J0 according to EN 10027-1. The coating properties were assessed based on macro and microscopic metallographic examinations, chemical composition tests, microhardness measurements and abrasion and erosive wear resistance tests. The obtained results were compared with the results obtained for samples with coatings made of aluminum powder - EN AW 1000 series.

PL

W artykule przedstawiono wyniki badań dotyczących właściwości tribologicznych powłok aluminiowych, wzmacnianych cząstkami materiałów węglowych w postaci nanorurek Nanocyl NC 7000 w ilości 0,5% wag. i 1% wag. oraz karburytu (węgla pierwiastkowego) w ilości 0,5% wag., natryskiwanych płomieniowo proszkowo (PFS) na podłoże z niestopowej stali konstrukcyjnej gatunku S235JO wg EN 10027-1. Oceny właściwości powłok dokonano w oparciu o badania metalograficzne makro- i mikroskopowe, badania składu chemicznego, pomiar twardości oraz badania odporności na zużycie ścierne i erozyjne. Otrzymane wyniki porównano z wynikami otrzymanymi dla próbek z powłokami wykonanymi proszkiem aluminium seria EN AW 1000.

14

Opracowanie nowej gamy płytek o wysokiej odporności na ścieranie z wykorzystaniem innowacyjnego systemu barwienia masy

Poddębniak Anna

Szkło i Ceramika

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2019

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R. 70, nr 1

32--34

15

Wybrane właściwości posadzki cementowej modyfikowanej nanocząstkami fluorku cyny

Krzywiński Kamil, Piechówka-Mielnik Magdalena, Sadowski Łukasz, Szymanowski Jacek

Materiały Budowlane

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2019

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nr 10

9--11

PL

W artykule określono wpływ modyfikacji posadzki cementowej nanocząstkami fluorku cyny(II) na jej wybrane właściwości. Do badań przygotowano jedną próbkę referencyjną oraz trzy różne próbki posadzki cementowej modyfikowanej fluorkiem cyny(II), z zawartością nanocząstek 0,5 ÷ 1,5% co 0,5%, w stosunku do masy cementu. Wykonane posadzki badano pod kątem odporności na ścieranie oraz przypowierzchniowej wytrzymałości na rozciąganie. Na podstawie badania ścieralności wykazano, że wraz ze wzrostem nanocząstek maleje ubytek masy posadzki cementowej. Dodatkowo, większa ilość fluorku cyny(II) w posadzce cementowej pozytywnie wpływa również na jej przypowierzchniową wytrzymałość na rozciąganie.

EN

The main aim of the article is to describe the influence of modification of cement floor with tin (II) fluoride nanoparticles on its selected properties. To the tests, one reference sample was prepared. Moreover, three cement floor samples were modified with different percentage content of tin(II) fluoride nanoparticles, from 0,5% to 1,5%, every 0,5%, in relation to cement mass. On prepared samples the abrasion resistance and subsurface pull-off strength tests were performed. Based on obtained results, it has been proved that abrasion resistance increases with higher amount of tin(II) fluoride nanoparticles in cement floor. Moreover, higher amount of tin(II) fluoride in modified cement floor has positive impact on its subsurface pull-off strength.

16

The Influence of the Shape of Graphite Precipitates on the Cast Iron Abrasion Resistance

Jakubus A., Soiński M. S.

Archives of Foundry Engineering

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2019

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iss. 4

87--90

EN

The paper presents the initial results of investigation concerning the abrasion resistance of cast iron with nodular, vermicular, or flake graphite. The nodular and vermicular cast iron specimens were cut out of test coupons of the IIb type with the wall thickness equal to 25 mm, while the specimens made of grey cast iron containing flake graphite were cut out either of special casts with 20 mm thick walls or of the original brake disk. The abrasion tests were carried out by means of the T-01M tribological unit working in the pin-on-disk configuration. The counterface specimens (i.e. the disks) were made of the JT6500 brand name friction material. Each specimen was abraded over a distance of 4000 m. The mass losses, both of the specimens and of the counterface disks, were determined by weighting. It was found that the least wear among the examined materials was exhibited by the nodular cast iron. In turn, the smallest abrasion resistance was found in vermicular cast iron and in cast iron containing flake graphite coming from the brake disk. However, while the three types of specimens (those taken from the nodular cast iron and from grey cast iron coming either from the special casts or from the brake disk) have almost purely pearlitic matrix (P95/Fe05), the vermicular cast iron matrix was composed of pearlite and ferrite occurring in the amounts of about 50% each (P50/Fe50). Additionally, it was found that the highest temperature at the cast iron/counterface disk contact point was reached during the tests held for the nodular cast iron, while the lowest one occurred for the case of specially cast grey iron.

17

Analysis of the Assessment of the Consumption State of Concrete Abrasive Surfaces Using Spatial Scanning

Horszczaruk E., Brzozowski P.

Tribologia

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2018

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nr 6

31--35

EN

The article presents the results of the analysis of surface damage of abraded underwater concretes with the use of spatial scanning. The concrete abrasion test was carried out using the ASTM C1138 underwater method. Spatial scanning was used to prepare a map of wearing of the abraded surfaces of the specimens. This map enabled a better prognosis of the abrasion wear of the concrete, particularly in the context of designing hydrotechnic reinforced concretes.

PL

W artykule przedstawiono wyniki analizy uszkodzeń powierzchni ścieranych betonów podwodnych z zastosowaniem skanowania przestrzennego. Badanie ścieralności betonów wykonano metodą podwodną wg ASTM C1138. Skanowanie przestrzenne umożliwiło wykonanie mapy zużycia powierzchni ścieranych próbek, która pozwoliła na lepsze prognozowanie zużycia ściernego betonu, szczególnie w aspekcie projektowania betonów hydrotechnicznych ze zbrojeniem.

18

Wpływ lakierowania na właściwości zadrukowanych podłoży papierowych

Gajadhur M., Steć A.

Przegląd Papierniczy

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2018

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R. 74, nr 2

119--123

PL

Celem pracy była analiza wpływu procesu lakierowania na właściwości z udziałem fleksograficznych farb wodorozcieńczalnych. W badaniach i lepkości. Właściwości powierzchniowe uzyskanych powłok oceniono mikroskopowo za pomocą profilometru skaningowego. Zbadano współczynniki chropowatości niezadrukowanego papieru oraz podłoży pokrytych ścieralności druków. Odporność na ścieranie oceniono spektrofotometrycznie na podstawie zmian parametru ΔEab*. Stwierdzono, że proces lakierowania znacząco poprawia odporność na ścieranie druków uzyskanych na papierowych podłożach drukowych. Rodzaj użytego lakieru nie ma tak istotnego znaczenia jak sam proces lakierowania. Wykazano wpływ chropowatości powierzchni na ścieranie druków.

EN

The objective of the research is to analyse the surface and resistant properties in flexographic printing with water-based inks. Three water-based varnishes of different gloss and viscosity were used in the studies. The surface properties of unprinted, printed, printed and varnished papers were evaluated with the 3D optical microscope. The surface roughness coefficient was calculated in the studies. Abrasion tests were performed in the Ink Rub Tester. The rub-off resistance was evaluated by spectrophotometric and visual observations. ΔEab* parameter was used in the evaluation. It was observed that the varnishing process significantly improves the the varnish does not have such an influence on improvement of abrasion resistance as that of the varnishing process itself. It was noticed that the surface roughness has an impact on the abrasion resistance.

19

Odporność odlewniczych tworzyw modelarskich na abrazyjno-mechaniczne ścieranie – nowa metoda badań

Snopkiewicz T., Zych J., Myszka M.

Prace Instytutu Odlewnictwa

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2018

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Vol. 58, no. 4

261--276

PL

W artykule przedstawiono wyniki badań przebiegów erozyjno- mechanicznego ścierania (zużywania się) powierzchni modeli odlewniczych (próbek testowych) wykonanych z kilku rodzajów tworzyw modelarskich. Badaniami objęto: żywice modelarskie, drewno, drewno malowane i stopy Al-Si. Testy odporności przeprowadzono na nowym, autorskim urządzeniu do badania ścieralności abrazyjno-mechanicznej, w którym materiałem ciernym był suchy piasek formierski. Użycie wybranej frakcji piasku przybliża warunki testów do warunków pracy modelu/rdzennicy przy wytwarzaniu form lub rdzeni. Urządzenie umożliwia prowadzenie prób przy zachowaniu, na wybranym poziomie, takich parametrów, jak: siła nacisku na powierzchnię, szybkość przemieszczania ścierniwa, rodzaj ścierniwa i jego parametry. W artykule prezentowane są schematy i zdjęcia urządzenia oraz badane próbki. Dokonano porównania ścieralności opisanych materiałów, wyniki przedstawiono graficznie – na wykresach. Na podstawie oceny odporności na erozyjne ścieranie można wnioskować o trwałości i przydatności danego materiału jako tworzywa na model/rdzennicę. W artykule przedstawiono wyniki pilotażowych badań. Nowe, prototypowe urządzenie umożliwia prowadzenia badań w szerokim zakresie zmienności parametrów i może być polecane do badań również innych tworzyw pracujących w podobnych warunkach jak modele odlewnicze i rdzennice. Dotyczy to elementów urządzeń, w których występuje proces przemieszczania materiału ziarnistego po powierzchni elementu konstrukcji (np. przy transporcie fluidalnym piasku).

EN

Investigation results of erosion-mechanical grinding (wearing) of surfaces of foundry patterns (test samples) made of several kinds of materials are presented in the hereby paper. Investigations contained: resins, wood, painted wood and Al-Si alloys. Resistance tests were carried out on the new, author’s device, for testing abrasion-mechanical grinding, in which the abrasion material constitutes a dry foundry sand. Using the sand selected fraction makes test conditions similar to operation conditions of patterns/ core boxes at producing moulds and cores. The device allows performing tests while maintaining – on the selected level – such parameters as: pressure on the surface, moving speed of abrasive material, kind of abrasive material and its parameters. Schemes and pictures of the device as well as of the tested samples, are presented in the paper. The comparison of grinding of the tested materials was performed and the results are presented graphically. On the basis of assessing the resistance for erosional grinding the stability and suitability of the given material for patterns/core boxes can be estimated. The results of the pilot investigations are presented in the paper. The new, prototype device allows performing investigations within a wide range of parameters variability and can be recommended for testing other materials operating under similar conditions as foundry patterns and core boxes. This concerns elements of devices in which the process of grain material movements on the surface of structure elements occurs (e.g. at fluidal sand transportation).

20

Tribological aspect of creating abrasion resistance of machine elements

Nosal S.

Journal of Research and Applications in Agricultural Engineering

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2018

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Vol. 63, nr 1

35--39

EN

The article presents the share of particular types of tribological wear and losses caused, with particular regard to abrasion. The wear on anchored grains and abrasion by grains between elements in frictional contact were characterized. General postulates regarding the limitation of abrasive wear depending on the conditions of its occurrence have been proposed.

PL

Przedstawiono udział poszczególnych rodzajów zużywania tribologicznego i strat, które powodują, ze szczególnym uwzględnieniem ścierania. Scharakteryzowano zużywanie o ziarna umocowane i ścieranie przez ziarna obecne między trącymi się elementami. Zaproponowano ogólne postulaty dotyczące ograniczania zużywania ściernego w zależności od warunków jego występowania.