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Konstrukcja korygowanej przekładni zębatej o zębach prostych w Inventorze : generator przekładni walcowej

Maciejczyk A.

Autobusy : technika, eksploatacja, systemy transportowe

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2018

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R. 19, nr 12

545--548

PL

W artykule przedstawiono proces konstrukcji korygowanej przekładni walcowej o zębach prostych. Omówiono pracę generatora przekładni zębatych. Wskazano procedurę korekcji zazębienia w oparciu o korekcję typy P0. Wstępne obliczenia wykonano z użyciem metod analitycznych. Dokonano analizy pracy kreatora komponentów przekładni. Wskazano błędy modułu obliczeniowego.

EN

The article presented the process of construction of a corrected cylindrical gear with straight teeth. The operation of the gear generator is discussed. The procedure of gear engagement correction based on P0 type correction was indicated. Preliminary calculations were made using analytical methods. The work of the generator of gear components was analyzed. Calculation module errors are indicated.

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An analysis of criterion for choosing constructional solutions for aeronautical multi-power path gear units

Kozik B.

Journal of KONES

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2011

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Vol. 18, No. 3

169-175

EN

Contemporary aeronautical constructions require applying systems of drive transmission based on gear units. Trends in development of aeronautical gears assume diminishing weight of the gear retaining its basic features which are; the possibility of transmitting high load and reliability. The article presents an analysis of criterion for choosing constructional solutions for aeronautical multi-power path gear units. A few criteria were chosen for the analysis: constructional solutions of aircrafts (planes, helicopters), constructional solutions of engine- moment receiver system and a kind of applied drive. Because the field of issues connected with aeronautical drive transmission systems is very wide, the material and technological factors were not taken into account. They are a subject of separate analysis. The main aim of the presented analysis is determining the criterion for choosing constructional solutions of drives based on existing solutions which allow for implementing new solutions for newly developed aeronautical constructions on the prototype stage. Modernising existing constructional solutions is difficult to put into practice because of procedures followed in the aeronautic industry. That is why the carried out analysis aims at preparing solutions for research on the stage of making a virtual and demonstrative prototype. The final effect of such analysis and research can be developing a solution for gear unit parts assuring the possibility of transmitting a given moment while diminishing, for example, weight in comparison to gears which are produced nowadays. This factor is extremely important for parts of aeronautical constructions.

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A demonstrative prototype of aeronautical dual-power path gear unit

Budzik G.

Journal of KONES

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2011

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Vol. 18, No. 4

41-46

EN

The paper presents a process of designing, modelling and manufacturing of a demonstrative prototype of a dual-power path gear unit to be applied in aeronautical systems of drive transmission. The process of making a demonstrator of a dual-power path gear unit by means of 3D-CAD modelling and Rapid Prototyping has been described here. Designing gears is based on Computer Aided Design (CAD), Computer Aided Engineering (CAE), Computer Aided Manufacturing (CAM) systems including also Rapid Prototyping (RP). The first stage of the designing process of a gear unit is always defining basic parameters of gear work (among others; power, rotational speed, transmission ratio) depending on the unit's predestination. On the basis of the above, the calculation of main constructional parameters is carried out. Subsequently, it is possible to make 3D-CAD models of toothed wheels and the remaining parts of the gear unit. In case of designing demonstrative prototypes, it is important to take into consideration the assumptions of modelling similarity to a real gear unit. 3D-CAD systems are often equipped with modules for analysing geometrical parameters and cooperation of individual parts of the unit for example the area of contact. A detailed analysis of cooperation of gear parts of the unit allows for detecting models' faults early and for deleting them. After making 3D-CAD models one can approach to creating a prototype by means of Rapid Prototyping methods. It is necessary to prepare the numerical data essential as a subsequent stage of the process of making the demonstrator. On that basis the individual parts of the gear unit are made in an incremental process. The accuracy of creating a physical prototype depends mainly on the accuracy of a 3D-CAD/3D-RP model prepared in a process of processing numerical data. A demonstrator described in the paper has been made by means of FDM method. The prototype allowed for analysing constructional solutions of gear units on a physical model and for preparing assumptions for introductory stand tests.

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Kinetics of phase transformations of undercooled austenite in 18CrNiMo7-6 steel applied for toothed wheels

Krawczyk J., Bała P., Pawłowski B.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 3 spec.

29--34

EN

Toothed wheels constitute essential part of the steel structural elements market. The most often hypereutectoid structural steels for carburizing are used for toothed wheels. The final producers of toothed wheels are not demanding regarding a microstructure, provided that the determined requirements will be fulfilled (e.g. metallurgical purity determined by ultrasounds). Therefore delivered forgings can be in an annealed or quenched state. This results from the situation that the final heat treatment or heat-chemical one is being done at one of the last stages of the toothed wheel production. An essential factor allowing to develop the proper heat treatment is the knowledge of the kinetics of phase transformations of undercooled austenite and its relating to technological conditions, being at the producer disposal, as well as to forging dimensions. Such investigations should be carried out on real melts used for forgings for toothed wheels production together with an analysis of microstructure changes on the forging cross-section. They should be based on calculation methods determining the distribution of cooling rates on its cross-section in dependence of an applied cooling medium. The mentioned above problems in relation to 18CrNiMo7-6 steel - are elucidated in this paper. The aim of the investigations was the description of the kinetics of phase transformations of undercooled austenite in this steel. The CCT diagram was constructed for the austenitizing temperature determined on the basis of phase transformations temperatures (the so-called critical points).

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Banded microstructure in forged 18CrNiMo7-6 steel

Krawczyk J., Pawłowski B., Bała P.

Metallurgy and Foundry Engineering

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2009

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Vol. 35, no. 1

45-53

EN

18CrNiMo7-6 steel, after hot forging, exhibits a distinct banding of ferritic-pearlitic microstructure, probably related to the segregation of alloying elements during the ingot crystallization. The heat treatment allowing to obtain bainitic microstructure in this steel is described in the paper. The obtained bainitic microstructure exhibits only very small traces of banding.

PL

Stal 18CrNiMo7-6 w stanie po kuciu na gorąco wykazuje wyraźną pasmowość mikrostruktury ferrytyczno-perlitycznej, związaną prawdopodobnie z segregacją pierwiastków stopowych podczas krystalizacji wlewka. Zaprezentowano obróbkę cieplną, pozwalającą na uzyskanie mikrostruktury bainitycznej w tej stali. Uzyskana mikrostruktura bainityczna wykazuje tylko bardzo niewielkie ślady pasmowości.

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Analiza porównawcza naprężeń kontaktowych w zazębieniu przekładni zębatej napędu wału rozrządu silnika Sulzer RTA48T-B

Berczyński S., Grządziel Z., Rukowicz S.

Zeszyty Naukowe / Akademia Morska w Szczecinie

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2006

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nr 10 (82)

51-59

PL

Przedstawiono modelowanie i ocenę naprężeń kontaktowych w zębach przekładni napędu wału rozrządu silnika Sulzer RTA48T-B przeprowadzoną przy wykorzystaniu systemu MSC Nastran for Windows. Weryfikacji modelu dokonano dla zagadnienia Hertza dotyczącego kontaktu dwóch walców. Model umożliwił określenie wartości na-prężeń w strefie kontaktu i w punkcie Bielajewa.

EN

This paper presents the modeling and evaluation of contact stresses in gear teeth of the camshaft drive of a Sulzer RT48T-B engine. The evaluation has been done with the MSC Nastran for Windows system. The model has been verified for the Hertz problem for a contact of two cylinders. The model made it possible to determine the value of stresses in the contact zone and in the Bielaiev point.

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Problem zdolności kształtowej i wymiarowej materiału na koła zębate w procesie obróbki cieplno-chemicznej

Zwolak J.

Problemy Eksploatacji

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1999

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nr 4

263-273

PL

W pracy przedstawiono zagadnienia dotyczące odkształceń zarysu ewolwentowego zębów kół zębatych występujących podczas obróbki cieplno-chemicznej. Spośród pięciu wymienionych materiałów stosowanych na koła zębate wyszczególniono stal 8620 oraz stal 4817. Są to stale mające zdolność zachowania stabilności kształtowej i wymiarowej po zakończeniu obróbki cieplno-chemicznej. Na podstawie badań eksperymentalnych zbudowano model graficzny odkształceń zarysu zęba, który następnie posłużył do ustalenia kierunku i wartości stosowanej modyfikacji technologicznej.

EN

The problems of the involuta profila deformations in the process of heat- chemical treatment owe presentandt in the paper. Two materials hove been specified from all live used in touthed wheeles monoufacture and normaly: stal 8620 and stal 4817. These steels hove the ability to preserve the form and dimension stability after heat-chemical treatment. The graphical model of the toath profile deformation has beed developed on the base of experiment. This model was therafter used in the orrangement of direction and the value of modification of process.