ストレッチドロー法による円筒成形に関する研究 : 第1報, 単段及び2段成形の実験的検討

概要

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Fundamental and informative data of axi-symmetric stretch-drawing of several sheet metals with thicknesses of 0.7-1.0 mm are presented both for single and double operations. Very small radius is applied to the die profile (or-shoulder) in all operations to induce wall-thinning by the effect of bending-under-tension, from which the name 'stretch-drawing' comes. It is clearly demonstrated that deeper cups could be formed by single and double stretch-drawings from smaller circular blanks due to such wall-thinning action than in the usual deep-drawing of larger blanks. From this fact, it is emphasized that the deep-drawability of a sheet metal is not evaluated simply by the conventional L. D. R (limiting drawing ratio), but the depth of the drawn cup should also be taken into account. Many experimental data about various metals and thicknesses given in this paper offer a valuable information in this process for more general use which recommends to replace the conventional deep-drawing process by the stretch-drawing process both for single and double operations. In the single stretch-drawing, it is also confirmed that a deeper cup can be produced by raising the blanks-holding force at later stage of operation.
社団法人日本機械学会の論文
1999-10-25