Experimental research of the quality of plating strip trimming during cladding the strips with cold rolling

Abstract

This paper examines the quality of trimming the edges of bimetal strips got by cold rolling. By producing the hard–soft–hard layered metal compositions, a low quality of cutting-up of clad strip edges is often observed. The trimming quality depends on the ratio of thickness of bimetal layers and their mechanical properties. The bimetals studied were composed of annealed strips of aluminium alloys A5 and AMg2 (thickness 1.0 mm, width 25 mm) as a base and brass L90, nickel silver MNTs 15-20 and steel 08kp as a cladding layer. The thickness of the cladding layer was from 7 to 35 % of the thickness of aluminium strip, with the width being equal to 50 mm. The ratio of tensile strength of the plating and the base varied in a wide range from 0.98 to 6.85. The experiments showed that trimming worsens as the ratio increases. The mathematical relation was obtained that gives the limit ratio of component thickness depending on the ratio of tensile strengths of the cladding material and the base providing high quality of edge cutting.