An Investigation into the Possibility of Roll Peen-Forming: Some Experimental Results

Summary

A preliminary investigation was made to ascertain the possibility of roll peen-forming aluminium, copper and steel sheets in a two high mill, i.e. rolling them between a flat roll and a roll with a number of balls of ½ in. in diameter embedded around its curved surface at regular distances. The thickness of the sheet material varied (from 0.034 in. to 0.125 in.) as also did the width of the sheets. The pock-marked surface of the sheet was observed to form its convex surface and was harder than the base material. The curvature of the sheets reached a maximum with the greatest penetration. The characteristic features of the roll peen-forming process were studied and the effect of ball indentation on roll load, roll torque, radius of curvature of the product and the indentation shape.