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96 Iustina Elena Rotman et al 5. * * * Ultrasound and Ultrasonic Testing. NDT Resource Center. Available from: http://www.ndt-ed.org/EducationResources/HighSchool/Sound/ultrasound.htm, Accessed: 07/02/2010. CONSIDERATII TEORETICE SI EXPERIMENTALE PRIVIND DETERMINAREA EFECTULUI DE DIVERGENTA (Rezumat) Aceasta lucrare prezinta un studiu experimental ce urmareste evidentierea parcursului ultrasunetelor de la traductor catre piesa de examinat, modul de reflexie al acestora si de afisare pe ecranul instrumentului de investigat cu scopul de a obtine rezultate eficiente. Obiectivul principal al acestei lucrari este determinarea efectului marginal de divergenta si eliminarea factorilor perturbatori ce pot influenta negativ rezultatele testarii cu ultrasunete. Studiile de caz prezentate si concluziile finale indeplinesc obiectivele propuse si pot contribui la dezvoltarea bazei de cunostinte.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LVI (LX), Fasc. 2, 2010 Secţia CONSTRUCŢII DE MAŞINI COMPUTERIZED MEASUREMENT SYSTEM BY CĂTĂLIN UNGUREANU 1 , RADU IBĂNESCU 2 and IRINA COZMÎNCĂ 1 Abstract. All technological machining systems parts made real surfaces certain deviations from the theoretical and nominal areas. The role of quality control is to decide whether or not these deviations fall within the allowable accuracy classes that imposed parts. The paper presents a computerized system for determining and recording deviations in shape of the real parts Key words: measurements, inductive transducers, data acquisition. 1. Introduction Accuracy is the degree of form areas of agreement between actual shape of the areas resulting from the processing and documentation of performance prescribed form. The causes of form deviations are multiple of which can be mentioned: • elastic deformation of pieces during processing; • tighten the fixing the wrong parts in devices; • failure of machine tools guidance; • wear or deformation of system machine-tool - cutting tools elements. The effects of shape irregularities are of the least desired, with negative implications for economic and technical performance of pieces processed: • edit the sliding friction between the parts of joints, • reduce static and dynamic tightness of parts and joints, • edit character fits, • they increase wear and may lead to locking parts in contact • decrease the durability of parts in contact.
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