Keywords
AISI 430 steel
coefficient of friction
bending under tension test
sheet metal forming
How to Cite
Abstract
Friction is an unfavourable phenomenon in sheet metal forming processes because it increases the forming force, reduces the surface quality of the drawpieces and affects the increased wear of the forming tools. This article presents the results of experimental studies on friction occurring due to the drawing die radius. The test materials used were 0.8-mm-thick strip samples made of AISI 430 steel and AW-1100 aluminium alloy sheets. A special bending under tension friction-test simulator was used to carry out the tests. Countersamples (pins) with different radii in the range of 1.5 mm to 13.5 mm were used. The tests were carried out at room temperature under mineral-based oil lubrication conditions. The friction tests were supplemented by determining the hardness and measuring the surface roughness (parameters Ra, Rq and Rt) of the samples. Based on the results, it was found that the coefficient of friction increased with a decrease in the bending pin radius, however, this behaviour changed above a critical radius (4.5 mm), after which the coefficient of friction increased with an increase in the pin radius. Furthermore, the AW-1100 aluminium alloy strip had a higher coefficient of friction than the AISI 430 steel strip.
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