Determination of Barreling of Aluminum Solid Cylinders During Cold Upsetting Using Genetic Algorithm

Abstract

This study presents Genetic Programming models for the formulation of barreling of aluminum solid cylinders
during cold upsetting based on experimental results. The maximum and minimum radii of the barreled
cylinders having different aspect ratio (d/h= 0.5, 1.0 and 2.0) were measured for various frictional conditions
(m=0.1-0.4). The change in radii with respect to height reduction showed different trends before and after
folding, therefore, the corresponding reduction ratios of folding were also determined by using incremental
upsetting. Genetic programming models were prepared using the experimental results with the input variables
of the aspect ratio, the friction coefficient, and the reduction in height. The minimum and maximum barreling
radii were formulated as output taking the folding into consideration. The performance of proposed GP models
are quite satisfactory (R2 = 0.908-0.998).
Keywords: Upset, forging, barreling, bulging, axisymmetric compression.