四角筒容器の深絞り加工(第2報)

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In the previous paper, the shape of blank, maximum drawing force and drawing limit for deep-drawing of the aluminium square shells of 100mm width were described. In this paper, those experimental results for 7/3 brass and copper are shown together with those of aluminium. Also the relation between results for drawing of square shell and circular shell is described. The experimental results are as follow; 1) The suitable shape of blank for square shell are octagonal shape and rounded corner shape, and the best result is obtained by the latter. In this case, the suitable ratio of the actual coner radius of blank R_0 to the calculated radius R_c is affected by kind of material, and it is from about 1.05 to 1.10 for aluminium, but takes the value up to 1, 4 for 7/3 brass. 2) The maximum drawing force P_m, for square shells drawn with blank of octagonal and rounded corner shape, together with the p_m for circular shells drawing, show a following relation with the drawing dimensions; [numerical formula] where m_1=( l/2_<r1>)^<0.2>, m_2=1/25, R_0=actual corner radius of blank, r_2=corner radius of die. r_1=corner radius of punch, r_a = radius of die shoulder, l=length of straight side, l'=total length of straight portion of shell contour, t_0=thickness of blank, σ_b=tensile strength, σ_s=0.2% yielding stress. 3) If the concentration of drawing stress are avoided by the sufficientlly larger values of γ_d and γ_p, the deepest drawn depth for square shell is approximatly equal to the width.
宇宙航空研究開発機構の論文
1954-03-15

四角筒容器の深絞り加工(第2報)

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