The paper presents the methodology and results of experimental works concerning temperature of burnishing process. The research was carried out during disk burnishing of external cylindrical surfaces on a universal lathe CDS 6250 BX-1000 with severe parameters. As workpiece material steel S235JR has been selected. For temperature measurements infrared thermography method was chosen. This technique has a lot of advantages, the main is that it is non-contact technique and therefore there is no disturbance of the temperature field. In presented research infrared camera E95 produced by FLIR® Systems Inc. was used. Test results indicates the slight influence of process parameters on burnishing temperature.
PL
W pracy przedstawiono metodykę i wyniki prac eksperymentalnych związanych z wyznaczeniem temperatury nagniatania. Badania prowadzono w trakcie nagniatania krążkowego zewnętrznych powierzchni walcowych na tokarce uniwersalnej CDS 6250 BX-1000 przy różnych parametrach obróbki. Jako materiał obrabiany przyjęto stal S235JR. Do pomiarów temperatury wybrano metodę termograficzną, ze względu na szereg jej zalet na tle innych metod. Główną zaletą jest możliwość zdalnego, bezkontaktowego pomiaru, dzięki czemu rozkład temperatury na powierzchni jest niezakłócony. W przedstawionych badaniach do pomiaru temperatury stosowano kamerę E95 firmy FLIR® Systems, Inc. Wyniki badań wskazują, że wpływ parametrów nagniatania na temperaturę w strefie obróbki jest niewielki.
Currently, the manufacturing management board applies technologies in line with the concept of Industry 4.0. Cyber-physical production systems (CPSs) mean integrating computational processes with the corresponding physical ones, i.e., allowing work at the operational level and at the strategic level to run side by side. This paper proposes a framework to collect data and information from a production process, namely, the burnishing one, in order to monitor real-time deviations from the correct course of the process and thus reduce the number of defective products within the manufacturing process. The proposed new solutions consist of (i) the data and information of the production process, acquired from sensors, (ii) a predictive model, based on the Hellwig method for errors in the production process, relying on indications of a machine status, and (iii) an information layer system, integrating the process data acquired in real time with the model for predicting errors within the production process in an enterprise resource planning (ERP) system, that is, the business intelligence module. The possibilities of using the results of research in managerial practice are demonstrated through the application of an actual burnishing process. This new framework can be treated as a solution which will help managers to monitor the production flow and respond, in real time, to interruptions.
Urabianiu skał, zwłaszcza trudno urabialnych oraz silnie abrazyjnych, kombajnami górniczymi towarzyszy intensywne zużycie narzędzi o różnym charakterze. Dominującymi formami uszkodzeń eksploatacyjnych noży kombajnowych jest zużycie ściernoerozyjne ostrzy oraz wykruszanie węglików spiekanych. Narzędzia te poddawane są przy tym działaniu cyklicznie zmiennych, silnych obciążeń, nierzadko o charakterze udarowym. Prowadzi to niejednokrotnie do wskrośnego pękania zmęczeniowego trzonków noży w obrębie karbu konstrukcyjnego, jakim jest przejście pomiędzy kołnierzem oporowym i częścią chwytową trzonka noża. Własności wytrzymałościowe zastosowanego materiału, postać konstrukcyjna oraz technologia wykonania noży kombajnowych zapewnić powinny dlatego możliwość przenoszenia dużej liczby cykli zmian obciążenia do wystąpienia pełnego przełomu zmęczeniowego. W artykule zajęto się możliwością wydatnego zwiększenia trwałości zmęczeniowej trzonków noży dzięki wykorzystaniu zgniotu powierzchniowego wykonywanego na zimno. Przedstawiono opracowane w Katedrze Mechanizacji i Robotyzacji Górnictwa Politechniki Śląskiej wybrane rozwiązania urządzeń do umacniania trzonków noży styczno-obrotowych stosowanych w kombajnach górniczych, zwłaszcza w kombajnach chodnikowych metodą naporowego i dynamicznego ich nagniatania. Zaletą tych rozwiązań jest prosta konstrukcja, możliwość wykorzystania konwencjonalnego parku maszynowego oraz niski koszt takiego zabiegu.
EN
The cutting with mining machines, especially of hard and very abrasive rocks, is accompanied by various types of intensive wear and tear of the tools. The predominant types of wear and tear are abrasive and erosive wear of the picks and chipping of the carbide tips. These tools are subjected to the action of cyclically variable, strong and often impact loads. This often leads to fatigue cracking of the shank of the picks within the constructional notch, which is the transition between the thrust collar and the handle of the shank. The strength properties of the material used, the constructional form and the technology of cutting picks should therefore ensure the possibility of transferring a large number of cycles of load changes to the occurrence of a full fatigue break. The article looks at the possibility of significantly increasing the durability of mining machines picks due to the use of burnishing process. The selected solutions of devices for strengthening the shanks of conical picks used in mining machines, especially in roadheaders by means of static and dynamic burnishing developed at the Department of Mining Mechanization and Robotisation of the Silesian University of Technology are presented.
Products used in the construction of machines and shipbuilding as well as petrochemical industry, such as shafts, bars, pipes and the like from two-phase stainless steel are currently very popular. It is required that they meet certain quality criteria. They must be characterized by suitable properties of the surface layer to meet the requirements of potential buyers. In the article impact of processing parameters on the degree of relative strain hardening and index of surface roughness reduction were presented. The burnishing process was carried out for two-phase stainless steel. Burnishing process of the shafts neck was performed using burnisher roller. 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 process was made in the Laboratory of Production Engineering. 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 rate 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.
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.
Throughout planning of technological process of manufacturing or regenerating machine components, the method of burnishing, the machining conditions, the shape and number of burners should be selected. The choice of static pressure conditions during burnishing process is dependent on how the pressure components are applied to the workpiece surface, which can be elastic or rigid. The reliability of working machine and equipment is very important in the engineering, power, metallurgical or marine industries. For example, on a ship during a cruise, are made repairs of individual components of the ship’s machinery. Often are regenerated external cylindrical surfaces (e.g. shaft seals of seawater pumps), for this purpose can be proposed burnishing process can be proposed as a finishing, which enables to obtain the technological quality requirements of the products surface layer. The effect of technological conditions of burnishing process on the degree of relative strain hardening and surface roughness reduction ratio were presented. The burnishing process carried out for duplex cast steels series GX2CrNiMoCuN25–6–3–3. The use of duplex cast steel burnishing process is a novelty technology. The experimental investigation 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 process were made in the Laboratory of Production Engineering of the Department of Marine Maintenance. 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 (the recommended parameters: burnishing speed vn = 70 m/min; feed rate fn = 0.2 mm/rev; depth of burnishing an = 1.0 mm; number of machining passes i = 2). The aim of applying burnishing may be, for example, the need to increase surface smoothness and dimensional accuracy of part.
PL
Celem pracy było wyznaczenie wpływu parametrów obróbki plastycznej przez nagniatanie na zmianę współczynnika zmniejszenia chropowatości powierzchni i względnego stopnia umocnienia warstwy wierzchniej staliwa typu dupleks. W artykule przedstawiono wyniki badań doświadczalnych nagniatania staliwa typu dupleks w gatunku GX2CrNiMoCuN25–6–3–3. Nagniatanie czopów wałów przeprowadzono z wykorzystaniem nagniataka krążkowego (NK-01). Po przeprowadzonych badaniach eksperymentalnych określono, że występuje wzrost stopnia umocnienia, następuje zmniejszenie chropowatości, a krzywa udziału materiałowego ma kształt wypukły, co, biorąc pod uwagę nośność powierzchni, wpływa bezpośrednio na jej odporność na zużywanie ścierne i korozyjne. Stwierdzono, że na twardość warstwy wierzchniej oraz chropowatość zewnętrznych powierzchni walcowych mają wpływ parametry technologiczne: posuw nagniatania, dosuw nagniataka, prędkość nagniatania i liczba przejść obróbkowych.
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Purpose: The aim of the study was description to the influence of technological parameters of burnishing process on the degree of relative strain hardening and surface roughness reduction ratio. Design/methodology/approach: Burnishing process carried out for stainless steels X2CrNiMo17-12-2. After the experimental research, it was determined that there was an increase in hardness and a decrease in roughness. The hardness was measured with the use of Vickers hardness tester. Observation of the microstructure of stainless steel samples was carried out using scanning electron microscopy and optical microscopy. The parameters of surface roughness measurements were performed to the principles contained in ISO standards. Findings: In the production and regeneration of metal products used in machine elements is important to technological quality surface layer. In surface engineering one of the ecological and economic treatments used for endurance and technological properties is burnishing. This is a surface forming a local plastic deformation based on the overall impression given by smooth and hard tool. Practical implications: The burnishing due the technological and economic aspect in the production and regeneration of machine parts in exchange for the abrasive processing can be used. In production engineering or technology of repair cylindrical outer surfaces (e.g. plugs propulsion shaft centrifugal pumps seawater) are finishing. You can therefore propose burnishing in exchange for abrasive machining. Originality/value: Important question to determine in the article of the research was to received appropriate technological quality. After the tests, it was found that the technological 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.
W pracy badano wpływ parametrów technologicznych (głębokości nagniatania) powierzchniowej obróbki plastycznej na wytrzymałość zmęczeniową wałków podczas ich zginania obrotowego. Próbki walcowe ze stali C45 były wstępnie toczone, a następnie nagniatane na różne głębokości. Tak przygotowane próbki poddawano cyklicznemu zginaniu, aż do ich przełamania. Na tej podstawie określono wpływ głębokości nagniatania na wytrzymałość zmęczeniową. Otrzymane wyniki przedstawiono w postaci tabeli oraz wykresów.
EN
In the paper the influence of technological parameters (burnishing depth) of the plastic surface treatment on the fatigue strength of the shafts during bending tests was investigated. C45 cylindrical specimens were prerolled, then burnished on the different depths. The samples prepared in that way were subjected to cyclic bending until they were broken. On this basis the impact of the burnishing depth on the fatigue strength was determined. Results obtained are presented in the form of table and graphs.
W pracy omówiony został proces nagniatania tocznego osiowego powierzchni wałków ze stali C45. Powierzchnie do nagniatania przygotowano w procesie toczenia. Następnie wykonano pomiary powierzchni i określono parametry chropowatości po obróbce poprzedzającej (toczeniu). Proces nagniatania przeprowadzono na obrabiarce RM 4010, stosując różne głębokości procesu. Powierzchnie ponownie zmierzono i określono parametry chropowatości po procesie nagniatania. Analizie poddano wpływ głębokości nagniatania na chropowatość powierzchni wałków stalowych. Otrzymane wyniki przedstawiono w postaci profilogramów, tabeli oraz wykresów.
EN
The process of axial burnishing rolling of surfaces from C45 steel rollers is discussed. Finishing surfaces were prepared in a rolling process. Then surface measurements were made and the roughness parameters were determined after pretreatment (turning). Burning was performed on a RM 4010 machine using different depths of the process. Surfaces were remeasured and roughness parameters determined after the burnishing process. The influence of the burnishing depth on the surface roughness after axial burnishing rolling was analyzed. The results are presented in the form of profilographs, table and graphs.
The article presents the experimental results of investigation of the pumps shaft surface made of stainless steel after burnishing process. The process of burnishing shafts proposed here aims at increasing the service durability of marine pump shafts of seawater installations, which should give economic benefits in comparison with traditional methods. Burnishing process enables the achievement of high smoothness of machined surface together with the surface layer hardening. This process has been performed in industrial experience on universal machine tools and on CNC machines but it is regarded as plastic tooling. Therefore, the final formation of dimensions and service properties with the use of burnishing constitutes a chipless and dustless treatment, which allows for ranking burnishing among ecological tooling methods. The properties of the surface layers determine the tribological properties of the shaft. The methods of scanning electron microscopy (SEM), atomic force microscopy (AFM) and nanoindentation (NI) were used. The morphology of the changed layers formed by plastic deforming of steel during burnishing treatment was investigated on micro- and nanolevel by SEM and AFM after 1, 2, 3 and 4 passed of burnishing tool. The values of microhardness and Young´s modulus were measured on the shaft cross section from the surface till the 50 – 300 μm depth. The presence of the soft changed layer on the hardened shaft surface after burnishing process determines the decrease of the coefficient of friction during exploitation.
The paper presents the research results of relationship between surface roughness reduction index KRa and three input parameters: burnishing speed Vn, feed fn and burnishing force Fn., and all combinations of levels of yields N measured for 48 points of experiment. The experiment was repeated 3 times. In order to select the model describing the results of tests, the stepping approximation analysis was performed. It relayed at incorporated into the model in following steps approximation elements function, giving the biggest decrease of the sum of squared deviations. The first approximation was based on the ternary monomial of the powers from 0 to 3 for each input value. This approximation aim was to show, that the index of surface roughness reduction does not depend on the burnishing speed in the made in the area of research. The reduced input parameters to two, i.e. fn and Fn. The plan of the experiment was brought to N = 12 and M = 12. The best approximation of test results obtained in the case of Laurent polynomial with stepping selection of elements. The biggest contribution to the decrease in the sum of squared deviations was element 𝑓𝑓𝑛𝑛 −1 ∙ 𝐹𝐹𝑛𝑛 3 , and then fn 2. The article shows that in the range fn {0.6:1.2} there was not information on the successful model and the lack of influence of f and Fn on the results of the experiment. It is postulated to retry the experiment for the feed f <0.6.
New technology with sliding burnishing of holes with cylindrical surface, made of hardened steel (60 HRC), is presented in the paper. Burnishing process was applied with specially designed tools. These tools can be used in CNC lathes and machining centres. After burnishing operation on hole ø 30 mm in satellite gear wheel the surface roughness parameter Ra = 0,02-0,04 mm was obtained. The method and results of research as well as technological conclusions are presented.
PL
W artykule przedstawiono nową technologię otworów o gładkiej powierzchni, wykonanych w elementach maszyn ze stali hartowanej o twardości 60 HRC z zastosowaniem nagniatania ślizgowego. Obróbka wykończeniowa otworów odbywa się z użyciem specjalnych narzędzi nagniatających stosowanych na tokarkach CNC i centrach obróbkowych. Po nagniataniu otworu ø 30 mm w kole zębatym przekładni satelitarnej uzyskano powierzchnię o parametrze Ra = 0,02-0,04 mm. Podano przebieg i wyniki badań doświadczalnych oraz wnioski i zalecenia technologiczne.
The method is based on a combination of previously used two separate operations namely machining and burnishing in a one complex operation implemented on a lathe. The application of such a complex machining operation on a single work station is a technological innovation with high economic efficiency. In one pass of special cutting-burnishing heads three processes: semi-finishing, finishing and strengthening by cold work are realized. In this way, the costly operations like, shafts grinding or holes honing can be eliminated. In the case of the proposed technology, e.g. in the production of hydraulic cylinders, machining time for piston rods and cylinders can be about 6 times shorter in relation to the conventional technology (with grinding or honing). Integrated machining with turning and burnishing is particularly effective and recommended for use on dedicated CNC machines with numerical control. Discs or rollers for generation of plastic deformation in the surface layer are placed in the back of the head. In the case of machining shafts and hydraulic cylinders of steel C45 is possible to obtain a surface roughness Ra= 0,16 – 0,32 micrometers, dimensional accuracy class 7-8 according to ISO standards, and increase in the hardness of the surface up to 40%.
PL
W pracy przedstawiono zintegrowaną metodę – jednoczesne toczenie (lub roztaczanie) i nagniatanie powierzchni cylindrycznych w jednej operacji na specjalizowanych tokarkach. Metodę cechuje duża efektywność – obróbka odbywa się w jednym przejściu roboczym specjalnych głowic skrawająco--nagniatających. Głowice wykonują jednocześnie obróbkę kształtującą i wykończeniową z jednoczesnym umocnieniem warstwy wierzchniej w wyniku plastycznego odkształcania. Obróbka może zastąpić szlifowanie długich wałów lub gładzenie (honowanie) głębokich otworów. Zalecana jest szczególnie w technologii tłoczysk i cylindrów hydraulicznych siłowników – czas obróbki ok. 6 razy krótszy w porównaniu do technologii tradycyjnej (ze szlifowaniem lub honowaniem). Opisane konstrukcje głowic skrawająco-nagniatających zostały sprawdzone w badaniach laboratoryjnych i przemysłowych na tłoczyskach i cylindrach hydraulicznych siłowników wykonanych ze stali C45. Uzyskano chropowatość powierzchni – Ra w zakresie 0,16-0,32 μm i dokładność wykonania średnic w zakresie 7-8 klasy wg ISO. Twardość warstwy wierzchniej zwiększyła się po nagniataniu o ok. 40%.
W artykule zaprezentowano modelowanie analityczne eksperymentalne procesu nagniatania. Przeprowadzono badania modelowe nagniatania statycznego naporowo tocznego powierzchni walcowych zewnętrznych dla różnych rodzajów materiałów, dla stali niestopowych, stopowych nierdzewnych. Obróbka nagniataniem warstwy wierzchniej wałów napędowych (np. pomp wody morskiej) została przeprowadzona z wykorzystaniem nagniataka krążkowego (NK-01). Istotnym zagadnieniem do rozwiązania podjętego problemu w artykule było uzyskanie odpowiedniej jakości technologicznej, a także ze względu na aspekt ekonomiczny wytwarzania i regeneracji części maszyn, zastosowanie obróbki nagniataniem w zamian za gładkościową obróbkę ścierną. W badaniach eksperymentalnych uzyskano w warstwie wierzchniej wzrost twardości i krzywą udziału materiałowego o kształcie wypukłym, co biorąc pod uwagę nośność powierzchni wpływać będzie bezpośrednio na jej odporność na zużycie ścierne i korozyjne.
EN
The paper was an analysis analytical experimental of the burnishing process. Modeling studies conducted burnishing process external cylindrical surfaces. Burnishing carried out for different types of materials for non-alloyed steels, stainless steels.Burnishing processing technology is proposed using burnisher discoid (NK-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 also 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 aim of this article is to demonstrate the applicability of innovative burnishing rolling process in the creation of eco-product. Applying the principle of eco-design one should take into account the construction and manufacturing process. Burnishing rolling process is effective: technologically, economically and environmentally way of treatment of the machine's outer layers. According to the literature promising results can be achieved by using a surface plastic treatment. It allows to receive product with advantageous shaped surface layer adapted to the conditions of exploitation (it is possible to control the surface roughness parameters and residual stress state). Study of the proposed technology may to confirm the possibility of steering of surface layer properties in aspect of receiving optimal utility properties. This approach will make possible the production of parts with minimal loss in material and energy. In order to prove the ability to create eco-product one conducted experimental and numerical researches of burnishing rolling process showing the ability to control the state of the surface layer of the product (surface condition and the state of stress).
The paper presents the environmental, economic and exploitation aspects of the use of burnishing rolling treatments. The validity of the application of the plastic surface treatment in modern technological processes by replacing expensive, energy-intensive defects processing (grinding, turning) was shown. One confirmed the possibility of obtaining resource saving products using burnishing with not worsen their utility quality as well as a lower unit price compared to products prepared using conventional technology.
W pracy przedstawiono analizę wpływu wybranych parametrów obróbki na jakość wyrobu po procesie nagniatania. Nagniatanie naporowe toczne jest geometrycznie i fizycznie nieliniowym problemem brzegowo – początkowym, w którym warunki brzegowe są nieznane w obszarach kontaktu narzędzia z przedmiotem. Analityczne rozwiązanie tego problemu jest niemożliwe. Możliwe jest rozwiązanie przybliżone przy wykorzystaniu metod numerycznych. W metodyce numerycznej zastosowano nowoczesną przyrostową teorię mechaniki ośrodków ciągłych (obliczenia krok po kroku), która pozwala wyznaczyć parametry siłowe dla przypadku braku znajomości warunków brzegowych w obszarze kontaktu. Dlatego też opracowano aplikację umożliwiającą symulację dla różnych warunków realizacji procesu i np. różnych materiałów obróbkowych. Przeprowadzono przykładowe obliczenia na podstawie których stwierdzono, że kąt wierzchołkowy nierówności przygotowanej w obróbce poprzedzającej nagniatanie wpływa na wartość składowej normalnej siły nagniatania. Otrzymane wyniki przedstawiono w postaci wykresów.
EN
The paper presents analysis of the effect of selected processing parameters on the quality of the product after burnishing process. Burnishing rolling is geometrically and physically nonlinear boundary - initial problem, in which the boundary conditions are unknown in the areas of contact of the tool with the subject. The analytical solution of this problem is impossible. It is possible to approximate the solution using numerical methods. The numerical methodology used modern incremental theory of continuum mechanics (calculations step by step), which allows to determine parameters of the force parameters for the absence of knowledge of the boundary conditions in the contact area. Therefore, the developed application that can simulate various conditions of the process and different materials. Sample calculations were carried out on the basis of which it was found that the apex angle of the prepared asperities in the previous treatment of burnishing give effect on the value of the normal component of the burnishing force. The results are shown in graphs.
W artykule przedstawiono wyniki badań wpływu oleju bazowego SN-150, preparatów eksploatacyjnych do olejów smarowych na bazie metali miękkich (R-2000) oraz o działaniu chemicznym (MotorLIFE) na proces nagniatania żeliwa EN-GJSFP-500-7 oraz na właściwości tribologiczne węzła tarcia przeciwpróbka brąz CuSi3Zn3Mn/próbka nagniatana żeliwo EN-GJSFP-500-7 smarowanego w procesie tarcia olejem bazowym SN-150. Dla celów porównawczych wykonano nagniatanie na sucho. Badania właściwości tribologicznych wykonano za pomocą testera T-05 typu klocek-rolka. Analiza wyników badań potwierdziła pozytywny wpływ preparatu eksploatacyjnego MotorLIFE na właściwości tribologiczne oraz na poprawę parametru chropowatości powierzchni wg Ra dla próbek nagniatanych na sucho i nagniatanych w obecności oleju bazowego SN-150 oraz preparatu eksploatacyjnego R-2000.
EN
In the paper, the results of research on the base machine oil SN-150 and the exploitative preparations R-2000 (preparation on the basis of soft metals) and Motor LIFE (preparation using chemical actions) influence on the tribological properties and stereometric state of cast iron EN-GJSFP-500-7 after a burnishing process. For comparative purposes, dry burnishing was also performed. These investigations were executed on tester T-05 (a roll – the block type tester). The main aim was to establish how the exploitative preparations R-2000 and MotorLIFE influence the surface layer state after the burnishing process. The waste investigations of the burnished surface were realized. Conducted investigations, the obtained results, and their analysis confirm the positive influence of the exploitative preparation MotorLIFE on tribological properties as well as the roughness parameters improvement in relation to the samples of dry burnishing, base machine oil SN-150, and exploitative preparation R-2000.
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Computer modelling and numerical analysis of dynamic burnishing (shoot peening) process in object surface layer internal stresses pattern aspect were the aims of the work. The influence of chosen process parameters on state of stresses was determinate. Incremental Lagrange formalism and adequate measures of stresses and strains were used in the paper. The application in ANSYS program, which allows to determinate the stains of stresses and strains in any point of surface layer of object and any time during the process, was created. The surface layer material was treated as an elastic/viscous-plastic body with nonlinear mixed hardening. Although the shoot was considered as ideally rigid or elastic body. Simulations were carried out basis on three levels experiment design. Simulations results were approximated by regression equations in square polynomial form. Compromising solutions sets for substitute optimization criterion were defined.
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Tematem artykułu jest nowa technologia hybrydowego nagniatania gładkościowo-umacniają-cego, stosowanego w celu jednoczesnego wytworzenia określonego stanu naprężeń własnych w warstwie wierzchniej wyrobu i odpowiedniej - ze względu na przeznaczenie części - struktury geometrycznej powierzchni. Przedstawiono możliwości sterowania rozkładem naprężeń własnych przez wielokrotne nagniatanie hybrydowe. Proces nagniatania hybrydowego modelowano w uaktualnionym opisie Lagrange'a z uwzględnieniem nieliniowości geometrycznej i fizycznej. Przedstawiono przykładowe wyniki symulacji numerycznej dla dwukrotnego nagniatania hybrydowego.
EN
New technology of hybrid smooth-strength burnishing, used in order to create the specified stress stale in product surface layer as well as its proper geometrical structure, has been presented in the paper. The possibility of the internal stress distribution control by means of multiple burnishing has been also shown. The process of the hybrid burnishing has been modelled in updated ; Lagrange description with regarding physical and geometrical nonlinearity. The example results of numerical simulation for double hybrid burnishing have been also attached.
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