ZESZYTY NAUKOWE POLITECHNIKI RZESZOWSKIEJ 288, Mechanika 85 RUTMech, t. XXX, z. 85 (2/13), kwiecień-czerwiec 2013, s. 129-137 Emil EVIN 1 Milan ÁBEL 2 Ján VIŇÁŠ 3 Jana TKÁČOVÁ 4 Bogdan ANTOSZEWSKI 5 TRIBOLOGICAL CHARACTERISTICS OF STAMPING DIES WITH COATINGS A variety of cast iron and steel grades are used for manufacturing dies in stamping industry. The costs of these materials may vary considerably. However, with ap- propriate surface treatments, coatings and lubricants, a cost-effective die material may outperform the expensive ones. Therefore, in selecting die materials, a sys- tematic evaluation of tool materials, coatings and heat treatments are required, considering the cost and tool life as parameters. In the contribution the plasma sprayed ceramic coatings Cr 2 0 3 and Al 2 O 3 were investigated in sliding contact with steel in both, the block-on-ring arrangement (tester T 05) and deep drawing proc- ess. The friction coefficient and wear of these coatings were measured at dry fric- tion conditions and with lubricant at utilization of tester T 05. For different types of die rings (with and without ceramic coatings) the punching forces were meas- ured during deep-drawing process. The results show that the main advantage of application of A1 2 0 3 and Cr 2 0 3 coatings on dies contact surfaces in comparison with dies made of tool steel may be the increase of life-time and wear resistance, the in- crease of the cup surface quality, savings of deficient elements by replacement of expensive tool steels by common constructional steels. Keywords: deep drawing, stamping die, ceramic coatings, friction coefficient 1. Introduction The result of deep drawing process depends on the one hand on steel sheets properties (mechanical and technological, chemical composition, surface micro- geometry, size of grain, homogeneity of structure, uniformity of mechanical 1 Autor do korespondencji/corresponding author: Emil Evin, Technical University in Košice, Mäsiarska 74, 040 01 Košice, Slovakia, tel.: +421 556023502, e-mail: emil.evin@tuke.sk 2 Milan Ábel, Technical University in Košice, Mäsiarska 74, 040 01 Košice, Slovakia 3 Ján Viňáš, Technical University in Košice, Mäsiarska 74, 040 01 Košice, Slovakia 4 Jana Tkáčová, Technical University in Košice, Mäsiarska 74, 040 01 Košice, Slovakia 5 Bogdan Antoszewski, Kielce University of Technology, 7 Tysiąclecia P.P. Ave, 25-314 Kielce, e-mail: ktrba@tu.kielce.pl