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Wyświetlanie 1-15 z 876
Tytuł:
The burnishing process of the stainless steel in aspect of the reduction roughness and surface hardening
Autorzy:
Dyl, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/246904.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
burnishing rolling–pressuring process
BRP
surface roughness reduction ratio
degree of relative strain hardening
stainless steel
Opis:
In the article were presented influence of technological parameters of burnishing process on the degree of hardness and reduction roughness. Burnishing process carried out for stainless steels X2CrNiMo17-12-2. The experimental research were obtained in the surface layer increase in hardness and the material ratio curve a convex shaped, which, taking into account the load capacity of the surface will be directly affected by its resistance to wear and corrosion. The experimental research by application of the burnishing rolling – pressuring process (BRP) method were made in the Laboratory of Production Engineering at the Department of Marine Maintenance at the Faculty of Marine Engineering at the Gdynia Maritime University. After the studies it was found that the hardness of the surface layer and the roughness of the shaft necks an important influenced by technological parameters of processing (burnishing speed, feed and depth of burnishing). The objective of applying burnishing process may be, for example, the need to increase surface smoothness and dimensional accuracy of part. To achieve the objectives strengthen and smooth of burnishing stainless steel should be used the one pass burnisher roller and feed fn = 0.2 mm/rev and disk burnishing tool feed an = 1.0 mm and burnishing speed vn = 70 m/min.
Źródło:
Journal of KONES; 2017, 24, 3; 63-69
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the geometry of the cutting edge and machining parameters of duplex cast steel after turning
Autorzy:
Dyl, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/246936.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turning
finishing
forming surface layer
surface roughness reduction
duplex cast steel
Opis:
The development and research activity is connected to the production of newer and more functional products. Innovative processes are being developed and applied; services and projects are delivered. Products are work items that should be initially designed, then manufactured and finally sold and utilized. Examples of products may be airplanes, ships, cars, machine tools, gears, crankshafts, drive shaft, tubes as well as gasoline, electricity and gas, etc. The product has to meet the expectations of the future use. It is characterized by a set of functional features. In the case of machines and their capabilities and performance, for example, durability, reliability, resulting from the characteristics represented by the structural units forming the structure. The formation of the desired features of the surface layer in the technological process is an important problem due to the ability of the elements of kinematic pairs to fulfil the function as long as possible foreseen for them. The article presents results of experimental studies of turning cast steel grade GX2CrNiMoCuN25-6-3-3. The aim of the research was to determine the geometry of the cutting edge and the technological parameters of cutting that are conducive to obtaining the roughness in the field of very accurate machining. It can achieve the appropriate technological quality of the workpiece surface. After these experimental studies was determined that there is a reduction roughness using suitable inserts. Turning was made for the duplex cast steel. The technological parameters of machining process were used: feed rate f = 0.1-0.2 mm/rev, depth of cut ap = 0.5 mm, cutting speed vc = 50-100 m/min. Turning was made using universal lathe CDS 500x1000 equipped with CCMT carbide tipped inserts.
Źródło:
Journal of KONES; 2018, 25, 4; 75-81
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finishing intermetallic coatings in order to reduce the surface roughness
Autorzy:
Dyl, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/247045.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
thermal spraying
intermetallic coatings
surface finishing
cutting inserts
Opis:
The paper presents a shape and grade of inserts depending on the surface roughness of the intermetallic coatings NiAl and Ni3Al. Intermetallic coatings on nickel based were sprayed with a torch Casto-Dyn 8000 on the steel samples. Thermal spraying intermetallic coatings have been high surface roughness, and therefore they must to be finishing. Experimental research was conducted for unalloyed steel samples with thermal spraying NiAl and Ni3Al intermetallic coatings. Before applying coatings, the samples surface was properly prepared by stream abrasive working, degreasing and finally by cleaning of oxidation products. To testing cutting inserts shape selects square and trigon made tungsten carbide and cubic boron nitride (borazon). Machining intermetallic nickel based coatings were carried out for the cutting speed vc = 214 m/min in the case of after-machining with inserts of borazon, vc = 107 m/min cutting inserts for tungsten carbide, used feed fn = 0.06 mm/rev and depth of cut ap = 0.3 mm. Intermetallic coatings are characterized by high resistance to tribology wear. These materials are used in such fields of technology, such as: electronics, energy, defense, automotive, aviation, shipbuilding, and more industry. The NiAl and Ni3Al intermetallic have found widespread applications as high – temperature structural material due to their high melting point, low density, good thermal conductivity and excellent oxidation resistance. The paper proposes the finishing flame sprayed intermetallic coatings.
Źródło:
Journal of KONES; 2013, 20, 1; 77-82
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of parameters burnishing rolling – pressuring process in aspect to technological quality surface layer of 316L stainless steel
Autorzy:
Dyl, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/244990.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
burnishing process
hardness
roughness
surface layer
stainless steel
proces nagniatania
twardość
chropowatość
warstwa powierzchniowa
stal nierdzewna
Opis:
In the manufacturing of machine elements was important to technological quality products. In surface engineering one of the economic and ecological treatments used for technological properties were burnishing rolling – pressuring process. This is a surface plastic forming a local plastic deformation based on the overall impression given by smooth and hard tool. In production, engineering cylindrical outer surfaces (e.g. plugs propulsion shaft centrifugal pumps seawater) were finishing. You can therefore propose burnishing in exchange for abrasive machining. The article presents the influence of parameters for burnishing rolling – pressuring process on the degree of relative strain hardening and surface roughness reduction ratio. Burnishing process carried out for 316L stainless steels. After the experimental study, it was determined that there was an increase in hardness and a decrease in roughness of the top outer cylindrical layer of stainless steel, which can be applied to the centrifugal pump shafts ship. Important question to determine in the article of the research was to receive appropriate technological quality. The burnishing due the technological and economic aspect in the production of machine parts in exchange for the abrasive processing can be used. After the experiments, it was found that the technical parameters are influenced by the hardness and the roughness of the outer cylindrical surfaces and the material ratio curve a convex shaped, which, taking into account the load capacity of the surface will be directly affected by its resistance to wear and corrosion of the surface layer.
Źródło:
Journal of KONES; 2018, 25, 1; 75-81
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Updates of deductive knowledge bases
Uaktualnianie dedukcyjnych baz wiedzy
Autorzy:
Przymusiński, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/91389.pdf
Data publikacji:
2011
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
update
types of updates
intelligent artifacts
baza wiedzy
programy adiustacyjne
uaktualnianie wiedzy
Opis:
We are continuously faced with the need to update the knowledge that we possess. Performing frequent updates allows us to learn new facts and discard those that no longer apply. One can reasonably argue that most, if not all, of our knowledge is acquired via suitable sequences of updates. By extension, the same applies to intelligent artifacts, such as intelligent knowledge bases and intelligent agents. However, performing meaningful updates is by no means a trivial task. First of all, we have to be able to properly represent our knowledge and provide it with a precise meaning or semantics. Intelligent artifacts, such as databases and intelligent agents, must be provided with a mathematically precise representation of the knowledge. Moreover, such knowledge must be represented in a manner, which is independent of procedural considerations, easy to communicate, exchange and reason about. We must be able to handle updates in a dynamically changing world and thus we have to decide how to resolve contradictions arising from new updates. Quite often, adding a new fact or a new rule to our knowledge base forces us to remove some other facts or rules that are inconsistent with the newly acquired information. At the same time, we want to make sure that the set of facts that need to be revised or outright deleted is, in some precise sense, minimal. Finally, we need to choose between different approaches to and types of updates. After all, updates were quite extensively studied in the literature for a number of years now. In this presentation, I will describe updates using the so-called interpretation or possible world approach. We will show how a commonsense version of Newton’s principle of inertia can be used to provide an elegant and simple characterization of such updates which properly subsumes the important class of revision programs, due to Marek and Truszczynski [MT, MT2], and the formula update approach, due to Winslett [W]. The presentation is intended to be introductory and accessible to non-experts. Consequently, it will only touch upon the important issues involved. The presented results were obtained jointly with Hudson Turner. For details we refer the reader to our joint paper [PT] and to subsequent papers on dynamic logic programs [APPP, ALPPP].
Nieustannie stajemy przed koniecznością uaktualniania wiedzy, którą już posiadamy. Przeprowadzanie częstych aktualizacji pozwala nam poznać nowe fakty i odrzucić te, które już nie znajdują zastosowania. W artykule opisano sposoby uaktualniania wiedzy przy użyciu podejścia zwanego interpretacją lub światem możliwym. Pokazano jak można wykorzystać zdroworozsądkową wersję newtonowskiej zasady bezwładności do scharakteryzowania w sposób elegancki i prosty powyższych uaktualnień, co właściwie podsumowuje istotną klasę programów adiustacyjnych (za Wiktorem Markiem i Mirosławem Truszczyńskim) i podejście uaktualniania formuł (za Marianne Winslett).
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2011, 5, 6; 60-66
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
We dont need jaeger air
Autorzy:
Moore, T. C.
Powiązania:
USNI Proceedings 1996, nr 9, s. 32-36
Data publikacji:
1996
Tematy:
Wojska lądowe działania operacyjne wsparcie lotnicze Stany Zjednoczone 1996 r.
Piechota morska działania operacyjne wsparcie lotnicze Stany Zjednoczone 1996 r.
Wsparcie lotnicze operacyjne Stany Zjednoczone 1996 r.
Lotnictwo morskie wsparcie działania operacyjne Stany Zjednoczone 1996 r.
Opis:
Analiza parametrów taktyczno-bojowych lotnictwa morskiego wspierającego operacje wojsk lądowych i piechoty morskiej USA.
Fot.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
The experimental analysis of the burnishing process using the methods : NPS
Autorzy:
Dyl, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/245624.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ballizing process
steel tube holes
surface plastic forming
roughness surface
Opis:
The paper presents selected results of experimental research of burnishing process of the steel tube holes. The ballizing process (NPS) is the method of burnishing where consists of pushing the tool through the hole, wherein the ball is greater in size than the opening of the value of the reduction ratio. Used tools to burnishing are hard and smooth surface. Burnishing elements are made of shape: ball, roll and disk. The ballizing process is carry out by a ball. The precise tube holes are made mostly methods abrasive machining. Machining these methods can usually maintain a within the tolerances established by the constructor size and shape and surface roughness. However, not achieved a satisfactory state surface layer of tube holes. Improve the properties of the surface layer can be obtained after application, as finishing, the slide burnishing. Modelling of the burnishing process using the method, NPS is to determine the impact of a specific curvature a rigid tool with of the workpiece. Ballizing process can increase the dimensional accuracy of tube holes, reducing the surface roughness, the strengthening of the surface layer, compressive residual stresses constitution. Compressive internal stresses substantially influence the fatigue life of machine parts. The aim of experimental research was to obtain surface layer state of compressive residual stress and the material ratio curve of convexity shape.
Źródło:
Journal of KONES; 2016, 23, 1; 107-113
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the burnishing process testing by the methods – BRP
Autorzy:
Dyl, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/247792.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
burnishing rolling–pressuring process
BRP
degree of relative strain hardening
surface roughness reduction ratio
surface layer
Opis:
The paper presents choice results of experimental testing of burnishing process by methods BRP – burnishing rolling – pressuring. The burnishing process is a technology of surface plastic forming of machine parts. The plastic deformations are called out by arrangement of strengths causing the superficial crossing the value of tension pressure of the materials. They set the on cold causing except moving the unevenness also the cold work in top layer of workpiece. Studies were conducted for burnishing process of the external cylindrical surfaces. Burnishing carried out for stainless steels. Burnishing technology was proposed using burnished roller (BR-01) in order to give adequate operational characteristics of the shafts neck centrifugal pumps. An important issue to resolve in the article of the research was to obtain appropriate technological quality, and because of the economic aspect of the production and regeneration of machine parts, burnishing applied in exchange for abrasive processing. In experimental studies were obtained in the surface layer increase in hardness and the Abbott-Firestone curve a convex shaped, which given load capacity of the surface will be directly affected by its resistance to wear and corrosion. The burnishing rolling – pressuring process (BRP) were decreased in surface roughness of the top outer cylindrical layer of stainless steel, which can be applied to the centrifugal pump shafts ship.
Źródło:
Journal of KONES; 2016, 23, 3; 121-126
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The finishing of composite coatings in aspect of surface roughness reduction
Autorzy:
Dyl, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/242029.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
composite coatings
flame spraying
cutting inserts
surface finishing
Opis:
The influence of the shape and grade of inserts upon the geometric structure of the composite coatings Ni-5%Al- 15%Al2O3 and alloy coatings of Ni-5% Al is considered in the paper. Nickel matrix coatings were sprayed by the Casto-Dyn 8000 torch on a steel substrate, and then subjected to straight turning. Determining of the optimum geometry of indexing is now synonymous with the selection of the optimum shape and dimensions of the insert and of an appropriate holder. According to cutting board it was selected square, triangular, trigon inserts, made of carbide and of cubic boron nitride (borazon). Machining of nickel-based coatings was carried out for the cutting speed vc = 214 m/min in the case of treatment with borazon inserts, vc = 107m/min in case of plates treated with tungsten carbide cutting, using the feed fn=0.06mm/rev and the depth of cut ap = 0.3 mm. Metal cutting the surface of steel samples coated with a composite coating containing 15% Al2O3 based on nickel, conducted for the cutting speed vc = 157 m/min when machining with borazon inserts and for vc = 83 m/min inserts with tungsten carbide for feed fn = 0.06 mm/rev and depth of cut ap = 0.3 mm. Highly precise finishing of flame spraying composite and alloy coatings was carried out using turning by tool with borazon inserts. Flank (VB) and attack (KB) wear coefficient of inserts while maintaining a constant spiral cutting length (SCL) were determined. Important elements parts (such as engines, pumps, centrifugal separators) are regenerated during long-term utilization. This paper proposes the use of regenerated technology subsonic flame thermal spraying and surface finishing by turning composite and alloy coatings of ship machinery parts.
Źródło:
Journal of KONES; 2013, 20, 2; 75-81
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Defect Detection in Ceramic Materials Based on Time-Frequency Analysis by Using the Method of Impulse Noise
Autorzy:
Akinci, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/177471.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
impulse noise
time-frequency analysis
defect detection in ceramic materials
Opis:
In this study, it was achieved by using the method of impulse noise to detect internal or surface cracks that can occur in the production of ceramic plates. Ceramic materials are often used in the industry, especially as kitchenware and in areas such as the construction sector. Many different methods are used in the quality assurance processes of ceramic materials. In this study, the impact noise method was examined. This method is a test technique that was not used in applications. The method is presented as an examination technique based on whether there is a deformation on the material according to the sound coming from it as a result of a plastic bit hammer impact on the ceramic material. The application of the study was performed on plates made of ceramic materials. Here, it was made with the same type of model plates manufactured from the same material. The noise that would occur as a result of the impact applied on a point determined on the materials to be tested has been examined by the method of time-frequency analysis. The method applied gives pretty good results for distinguishing ceramic plates in good condition from those which are cracked.
Źródło:
Archives of Acoustics; 2011, 36, 1; 77-85
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the quality of technological surfaces of machines of composite coatings
Autorzy:
Dyl, T. C.
Starosta, R.
Powiązania:
https://bibliotekanauki.pl/articles/243120.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
composite coatings
flame spraying
surface finishing
technological quality
Opis:
Nickel matrix coatings were sprayed by the Casto-Dyn 8000 torch on a steel substrate, and then subjected to straight turning. Determining of the optimum geometry of indexing is now synonymous with the selection of the optimum shape and dimensions of the insert and of an appropriate holder. According to cutting board, it was selected square, triangular, trigon inserts, made of carbide and of cubic boron nitride (borazon). Machining of nickel-based coatings was carried out for the cutting speed vc = 214 m/min in the case of treatment with borazon inserts, vc = 107 m/min in case of plates treated with tungsten carbide cutting, using the feed f =0.06 mm/rev and the depth of cut ap = 0.3 mm. Metal cutting the surface of steel samples coated with a composite coating containing 15% Al2O3 based on nickel, conducted for the cutting speed vc = 157 m/min when machining with borazon inserts and for vc = 83 m/min inserts with tungsten carbide for feed f = 0.06 mm/rev and depth of cut ap = 0.3 mm. Highly precise finishing of flame spraying composite and alloy coatings was carried out using turning by tool with borazon inserts. Flank (VB) and attack (KB) of turning tool wear while maintaining a constant length of spiral cutting (LSC) were determined. The effect of the shape and grade of inserts upon the geometric structure of the composite coatings and is considered in the paper. The article can determine the shape and grade of inserts is necessary to obtain sufficient quality of the shaft of centrifugal pumps with a composite coating.
Źródło:
Journal of KONES; 2014, 21, 1; 75-82
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power generation problems ranking using a combination of ahp and moora techniques
Autorzy:
Emovon, I.
Nwaoha, T. C.
Powiązania:
https://bibliotekanauki.pl/articles/409492.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
power generation problems
MOORA method
AHP
decision criteria
power generation infrastructure
Opis:
The inadequate electricity generation in Nigeria is the major reason for her economic woes. From the literature some of the problems affecting power generation in Nigeria are lack of policy continuity, drought, Militant activities and corruption. However the degree of impact each of the problem has on power generation varies. Therefore there a need to develop a tool that will identify critical problems such that power generation managers’ will use bulk of the meagre available resources in addressing the more critical ones. In this paper a tool which combine Multi-Objective Optimisation on the basis of Ratio Analysis (MOORA) technique with Analytical Hierarchy Process (AHP) is proposed for the prioritisation of the problems affecting power generation in Nigeria. The technique is illustrated with a numerical example developed from data from experts. From the result of the analysis, poor maintenance of power generation infrastructure, militant activities and corruption are the most critical problems hampering power infrastructure development in Nigeria. The proposed technique have been proven to be effective in prioritising power generation challenges as it produces almost completely same result with well-known mathematical techniques in literature.
Źródło:
Research in Logistics & Production; 2018, 8, 2; 155--168
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 876

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