PL
 |
EN
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 5

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Influence of machining of EN-GJL-250 and EN-GJS-400 cast irons on tribological behavior
100%
Martinez J. , Pereira A. , Perez J. A. , Mathia T.
Archives of Mechanical Technology and Materials
|
2015
|
tom Vol. 35
12--22
EN
In transport and, particularly in the case of the present study, naval industries, one of the major objectives of research on wear and friction is focused principally on solid lubrication. In the following paper, the tribological behaviors of two well-known, different cast irons, lamellar grey iron (EN-GJL-250) and spheroidal graphite ductile iron (EN-GJS-400), are compared and the results are analyzed. For each material's family, the surfaces’ properties are characterized at different stages of the machining process. The particular influence of diverse feed rates in a turning facing is evaluated. Moreover, some tests of the laser cladding process, which contribute to the improvement of superficial properties, are carried out; therefore, the initial morphology before surface treatment is carefully characterized and evaluated in the context of subsequent adhesion qualification. The final goal of the study is to deliver feasible initial information concerning two similar cast irons that are traditionally used in the naval industry, which would be manufactured and employed in the future as dry lubricated bearings
2
Content available remote Machinability of high-strength low-alloy steel D38MSV5S forged crankshafts
100%
Pereira A. , Riveiro E. , Martínez J. , Pérez J. A.
Archives of Mechanical Technology and Automation
|
2014
|
tom Vol. 34, no. 4
45--57
EN
The high strength low steel alloy (HSLA) denominated D38MSV5S, is a steel material widely used by forging companies, especially in the automotive industry, as crankshaft material due to its high fatigue resistance when is subjected to torsion. The aim of the following work verifies the machining conditions with two different cutting inserts. Moreover, it must be an initial step for comparison of the machinability of current crankshafts’ steel to new micro-alloyed steel used in forging in the purpose of future study. To verify the cutting conditions and tools’ behaviors, it was necessary to take into consideration the roughness measurements at different stages of machining operations. Also, surface wear measurements for tools and specimens were included. The next three different machining operations: facing, turning and drilling in lathe were studied both for roughing and finishing. And finally, determining the way to optimize the machine’s electric consumption, the surface’s characterization, the insert’s wear and the process time were included in the study.
3
Content available A concept of in-process measurement system for spline forming
100%
Wieczorowski M. , Eichner T. , Lindner I. , Pereira A.
Management and Production Engineering Review
|
2015
|
tom Vol. 6, No. 2
73--81
EN
In the paper a possibility of in-process inspection of gear and spline shafts during forming was discussed. Different methods of forming toothed elements were discussed as well as the other technologies were mentioned. Coordinate measurement technique as a way of post process inspection was presented. However, it is not possible to use it for checking features during forming process. To do it different sensors were used and their combinations were described.
4
Design and manufacture of casting pattern plates by rapid tooling
100%
Pereira A. , Perez J. A. , Dieguez J. L. , Pelaez G.
Archives of Materials Science
|
2008
|
tom Vol. 29, nr 1-2
63-67
EN
The primary target of this project consists of combining the technique of rapid prototyping and casting to produce aluminum parts in a sand mold being made the corresponding models and core boxes by means of the technology of rapid tooling, FDM (fused deposition modeling) of ABS. The followed process to obtain the pieces is casting, that consists of the fused metal spill in a mold pattern previously conformed, followed of a cooling and later rinding of the solidified piece. The models and core box, generally, is made in wood or plaster, but in this case they were made by means of a Rapid prototyping machine of the company 3Ddimension. The phase of design and manufacture of the model and the mold are most expensive and critical of the process. In this work it is tried to study the valuation of the time of manufacture of the models, core box and molds. The application Catia V5 R17 has been used for the geometric definition of the model and care box. This model is exported in stereolithography format (stl) and after this, the file was sent to the printer Dimension BST 768 and begin the construction of the models. The proposal methodology using rapid prototyping to generate the models is a clean and fast solution, and in addition it allows to obtain geometries that are nonviable by another procedure. The surface finish quality of the model is appropriate for the casting process, and reproduces with a high reliability the model CAD.
5
Phylogenetic affinities and infection patterns of Goussia infecting Sardina pilchardus from the NE Atlantic
75%
Xavier R. , Barroso R. , Cardoso J. , Cruz C. , Pereira A. , Saraiva A.
Acta Parasitologica
|
2021
|
tom 66
|
nr 2
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.