The present research aims at studying both dry machining and alternative solutions to wet machining in the drilling of carbon fiber-reinforced polymers (CFRPs). CFRPs are key materials in aerospace and their drilling is critical and challenging. Specifically, cryogenic fluids such as CO2 and N2 were investigated. Drilling tests were performed using three different CFRP laminates. These CFRP laminates are composed of various unidirectional plies of different orientations. Thus, the configurations to analyze were: 0/90/45, 30/60 and 0/90. As output variables, surface roughness, diameter deviation, delamination and thrust forces were analyzed. In general, the internal application of CO2 and dry machining were the best- and worst-performing techniques for surface roughness, respectively. Regarding the dimensional quality, both CO2 and dry machining offered the best results. In the case of LN2 or LN2 + CO2, the results showed that the CFRP configuration is critical for the obtained results. However, it was identified that cryogenics can improve the results of the dry machining process under certain conditions in terms of delamination. Finally, in general, CO2 provided the worst results when attending to the thrust forces.
It has developed a methodology to implement the Project Group Based Learning (PGBL) to solve the problems associated with the introduction of an innovative process conditioned by different types of restrictions, both the structure and type of curriculum, teaching resources available. This paper describes the characteristics of the experiences in PGBL in class practices related Technologies and Manufacturing Processes in ETSII of Vigo, as a part of changing habits and methods based on educational experiences which occurs in different countries of the European Area of Higher Education. We can conclude that the PGBL is a good alternative to the traditional education, especially to address and solve the real problems that require application of knowledge in Mechanical Manufacturing.
At this moment, the importance of computers in all the areas of knowledge is undeniable. Students must acquire competencies in computer use during their primary and secondary studies. Later on, during college education they must learn to use basic computer science tools used in their respective disciplines. On many occasions the professor is the person who designs the lab set-up, and also sets the configuration, installs and maintains all the computers. These tasks, especially the maintenance of the software and hardware environment, are not simple because, among other reasons, the design of a laboratory determines who uses it and how. Besides, those tasks are very important, as shown by all the research in the literature. In this paper we present a tool that simplifies this work in a very noteworthy way. That tool centralizes the installation, configuration and maintenance of the applications in a remote single server. Ill. 4, bibl. 15 (in English; abstracts in English and Lithuanian). nuotolinio edukacinių kompiuterinių laboratorijų kūrimo ir administravimo įrankis nuotolinio Linux įsikrovimo pagrindu // Elektronika ir elektrotechnika. -Kaunas: Technologija, 2012. -Nr. 3(119). -P. 103-108.Pirmosios ir antrosios pakopos studijų metu studentai turi įgyti kompiuterių naudojimo kompetencijas. Vėliau mokydamiesi jie turi išmokti naudoti pagrindinius kompiuterinius įrankius, taikomus atitinkamose disciplinose. Daugeliu atveju profesorius sukuria laboratorijos struktūrą, nustato jos konfigūraciją, įrengia ir prižiūri visus kompiuterius. Šie uždaviniai, ypač programinės ir aparatinės įrangos aplinkos priežiūra, nėra paprasti, nes laboratorijos projektavimas lemia, kas ir kaip ja naudosis. Pateikiamas įrankis, kuris supaprastina šį darbą. Jis centralizuoja taikomųjų programų įdiegimą, konfigūravimą ir palaikymą nutolusiame serveryje. Il. 4, bibl. 15 (anglų kalba; santraukos anglų ir lietuvių k.).
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