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104 Cătălin Ungureanu et al. SISTEM DE MĂSURARE COMPUTERIZAT (Rezumat) În lucrare este prezentat un sistem de măsurare a abaterilor de formă geometrică. Piesa de măsurat este amplasată pe două reazeme reglabile, astfel încât dreapta adiacentă să fie paralelă cu placa de control pe care se efecuează măsurarea. Pentru măsurare se utilizează un traductor inductiv, alimentat de la o sursă de curent continuu. Se utilizează o cartelă de achiziţie de date, un PC şi mediul de programare LabVIEW. Cu datele astfel obţinute se pot trasa diagrame ale formei reale a piesei. Datorită zgomotelor de măsurare, forma reală a piesei este mai greu de observat. Pentru a înlătura influenţa zgomotelor de măsurare se recomandă o filtrare de tip ”trece jos” a profilului obţinut. Aceasta se poate face cu ajutorul funcţiei smooth a programului Matlab, cu nivele diferite de filtrare.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LVI (LX), Fasc. 2, 2010 Secţia CONSTRUCŢII DE MAŞINI ADHESIVE BONDING OF SURFACE TREATED ALUMINIUM BY BIRGIT KJÆRSIDE STORM Abstract. Adhesive Bonding of aluminium and aluminium alloys can be carried out so a strong bonding is the result. The perfect bonding between two aluminium parts will be a bonding, where the material will break in the aluminium part, because in that case the bonding is stronger than the aluminium. For making a strong bonding a structural adhesive shall be used. A structural adhesive can be made of epoxy, polyurethane, acrylate, cyanoacrylate and a few other types. In some cases an anaerobe adhesive can cure up with aluminium. There is interaction between the adhesive, the aluminium alloy and the surface treatment. Aluminium creates in atmospheric air immediately an oxide layer on the surface. Anodized aluminium reacts with contaminations and CO2, which gives a surface with a low surface tension, though aluminium will have a high surface tension. The low surface tension of the reacted surface cause a bad wetting of the surface with the adhesive, and an insufficient wetting causes bad adhesion between the aluminium and the adhesive. For making a good bonding a good wetting is necessary. The sufficient wetting can be made on the aluminium by making a surface treatment. The surface treatment can be an anodizing. For obtaining the best adhesion on anodized surface the adhesive shall be carried out before the sealing immediately after the anodizing. The fresh anodized aluminium has a bigger surface and open pores, which cause a mechanical bonding in addition to the adhesion. The non sealed aluminium has reactive groups, which in some cases can react with reactive groups in the adhesive and can cause a chemical bonding as well. The non-sealed anodized aluminium can be treated with a primer, which can react with the active groups and can run into the pores and fill out the porousity. Before the primer has cured up totally the adhesive shall be added to the system for making a chemical reaction between the primer and the adhesive. Using such a system can give a higher strength in the bonding. Key words: aluminium, anodizing, adhesive, adhesive bonding, surface treatment, wetting 1. Introduction Adhesive Bonding of aluminium and aluminium alloys can be carried out so a strong bonding is the result. The perfect bonding between two aluminium
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