Effect of Friction on Barreling during cold Upset Forging of Aluminium 6082 Alloy Solid cylinders

[摘要] Friction is one of the significant factors in forging operations since it affects metal flow in the die, forming load, strain distribution, tool and die life, surface quality of the product etc. In upset forging, the frictional forces at the die-workpiece interface oppose the outward flow of the material due to which the specimen develops a barrel shape. As a result, the deformation becomes non-uniform or inhomogeneous which is undesirable. Barreling can be reduced by applying effective lubricant on the surface of the platens. The objective of the present work is to study experimentally the effect of various frictional conditions (dry, grease, mineral oil) on barreling during upset forging of aluminum 6082 solid cylinders of different aspect ratio (length/diameter: 0.5, 0.75, 1). The friction coefficients are determined using the ring compression test. Curvature of barrel is determined based on the assumption that the curvature of the barrel follows the geometry of circular arc.

[发布机构] Department of Mechanical Engineering, BITS Pilani Hyderabad Campus, Hyderabad; 500078, India^1

[效力级别] 机械制造

[关键词] Cold upset forging;Forming loads;Friction coefficients;Frictional forces;Ring compression tests;Solid cylinders;Strain distributions;Upset forging