Investigation On Effect Of Various Speeds On Springback Characteristic Of Aluminum Alloy Sheet 6061

Wan Nuraini, Mohd Jamil (2011) Investigation On Effect Of Various Speeds On Springback Characteristic Of Aluminum Alloy Sheet 6061. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Aluminum alloy is widely used in manufacturing processing industry for sheet metal forming. However, aluminum alloy sheet have the drawbacks against the springback phenomena in sheet metal forming. Bending is one types of sheet metal forming that create springback or residual plastic strain during the operation which will lead to the inaccurate dimension of the part. The objective of this project is to investigate the springback behaviour and characteristic in order to control and minimize this problem. In this project, the material used is aluminum alloy 6061 series. The U-shaped bending process will be bending into 90° during the experiment. The aim of this bending test is to determine the effect of punch speeds on springback phenomenon during sheet metal forming process. The angle of springback amount can be measured by using the coordinate measuring machine in four characteristic tooling regions. The springback characteristic will be observed in the tensile test by using different speeds. The mechanical test of hardness test is performed according to ASTM standard after the bending and tensile test. The lower punch speed will reduced the elastic recovery. The bending angles are near to 90 degree at the punch speeds below 5mm/s. Other than that, tensile test proved that higher punch speed will give greater elastic recovery. The elastic recovery becomes greater at speed of 10mm/s compared to the speeds of 3mm/s and 0.5mm/s. Then, hardness value is increased with the greater amount of spring back. The greater plastic deformations will contribute to the elastic recovery as the hardness value increasing. Besides, compressive stress of outer bending has higher hardness compared to the tensile stress of inner bending. Through this study, the improvement of the bending process can be inspecting in order to reduce the springback amount.

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