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212 Ovidiu Niţă and Vasile Braha instrument de apreciere a deformabilităţii tablelor metalice. Astfel, pentru efectuarea cercetărilor experimentale ce au vizat determinarea CLD s-au luat în calcul trei tipuri de materiale metalice des utilizate în mediul industrial: alamă, aluminiul si oţelul. Factorii consideraţi ca factori de influentă ai sistemului au fost grosimea semifabricatului şi forma plăcilor active folosite în cadrul dispozitivului experimental. Astfel, pentru efectuarea încercărilor experimentale s-au folosit semifabricate din table cu o grosime de 0,5mm; 1mm si 1,5mm în funcţie de materialul studiat. Trebuie specificat că pentru obţinerea deformaţiei s-a optat pentru procedeul de umflare hidraulică. De asemenea, soluţia constructivă a standului de lucru a permis varierea plăcii active între placă cu forma rotundă, eliptică si patrată.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI CONSIDERATIONS REGARDING THE BEHAVIOR OF STEEL XC45 AT DRY FRICTION AT A TEMPERATURE OF 80°C BY MARIAN TEODOR POPESCU ∗ , NICOLAE POPA, CONSTANTIN ONESCU and RADU NICOLAE DOBRESCU Received: October 12, 2012 Accepted for publication: November 28, 2012 University of Piteşti Abstract. One of the technologies for modifying the mechanical properties of materials is the rough chroming. Because of the advantages obtained with this procedure, rough chroming of steel XC45 was used also for obtaining good tribological properties. We have used a pawn-disc tribometer in order to obtain data regarding the behavior at dry friction. The experimental results and the conclusions are presented in this paper. Key words: Tribometer pawn-disc, wear ratio, friction surface 1. Introduction A great number of modern technologies for modifying the mechanical properties is used in the industry, to obtain advantages from the mechanical and tribological properties point of view. In paper (Popescu et al., 2011) are widely presented the advantages of rough chroming procedure. Since paper (Popescu et al., 2011) refers to the testing of steel XC45 at a temperature of 400°C on a pawn-disc tribometer, this paper presents the testing of the same material in the same conditions, so we will present only the results. ∗ Corresponding author: e-mail: npopa49@yahoo.com
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