Abstract
The present paper describes a tube drawing method with diameter expansion, which is herein referred to as “expansion drawing”, for effectively producing thin-walled tube. In the proposed method, the tube end is flared by pushing a plug into the tube, and the tube is then expanded by drawing the plug in the axial direction while the flared end is chucked. The forming characteristics and effectiveness of the proposed method were investigated through a series of finite element method (FEM) analyses and experiments. As a result of FEM analysis, the expansion drawing effectively reduced the tube thickness with a smaller axial load when compared with the conventional method. According to the experimental results, the thin-walled tube was produced successfully by the expansion drawing. Maximum thickness reduction ratios for a carbon steel (STKM13C) and an aluminum alloy (AA1070) were 0.15 and 0.29 when the maximum expansion ratios were 0.23 and 0.31, respectively. The above results suggest that the proposed expansion drawing method is effective for producing thin-walled tubes.
Highlights
Thin-walled tubes, which are used for various machine components, contribute to the reduction in size and weight of various machines
The present paper proposed a tube drawing method with diameter expansion, which is referred to
The present paper proposed a tube drawing method with diameter expansion, which is referred as ‘expansion drawing’, for producing thin-walled tubes effectively
Summary
Thin-walled tubes, which are used for various machine components, contribute to the reduction in size and weight of various machines. Various fundamental studies about the tube expansion have been conducted numerically and hoop directions, and negative deviatoric inresearch the thickness becomes larger than that in the conventional diameter shrinkage. 2 compares the stress state the and tube wall during with drawing was carried out to investigate the forming characteristics and the deformation mechanism, and the proposed method was compared with the conventional method. The tube wall stretches biaxially in the and the proposed method was compared with the conventional method. Based on the results for the tube flaring, FEM analysis of the expansion drawing was carried out to investigate the forming characteristics and the deformation mechanism, and the proposed method was compared with the conventional method. Methods used to calculate the maximum flaring ratio κf_max
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