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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.1 (1969) No.2 ■■■■■■■■■■■■■■■■■■■ |
| 超深絞り用KTS冷延鋼板のプレス成形性 Press-Formability of KTS Cold-Rolled Steel Sheet for Deep Drawing 中里 嘉夫(Yoshio Nakazato) 伊藤 庸(Yo Ito) 佐々木 徹(Toru Sasaki) 野原 清彦(Kiyohiko Nohara) |
| 要旨 : 冷延鋼板のプレス成形性とは，深絞り性，張り出し性，形状性，張り剛性および二次成形性などの諸特性の総称である。深絞り性はｒ値が高いほどよく，その意味で板面に平行な｛111｝集合組織をもつことが望ましい。張り出し性は延性破壊の起点となる非金属介在物や炭化物などが少ない板ほど良好である。形状性は降伏点が低いほどよい。張り剛性は弾性定数が高い｛111｝集合組織をもつ板が良好である。またこのような板は二次成形に関する異方性が少ない。KTS鋼板は，微量のP, Sb, Biなどを添加し，オープンコイル焼鈍によって脱炭脱窒したリムド冷延鋼板で，プレス成形性に必要な諸特性がアルミキルド冷延鋼板よりもさらにすぐれている。 |
| Synopsis : "Press-formability" of cold-rolled sheet is a generic term of the properties such as deep-drawability, stretch-formability, shape-fixability, rigidity and so-called "re-formability" etc. Deep-drawability of sheet is excellent as its r-value on tensile testing is high and this may be achieved by the sheet having the texture of preferred orientation in which {111} planes are parallel to the rolling surface. Stretch-formability of sheet is improved by minimizing the amounts of non-metallic inclusions or carbides etc. which can originate a ductile fracture in steel. The sheet of low yield strength is suitable for drawings which require good shape-fixability. Rigidity of drawings is enhanced if the sheet has "{111} texture" because the elastic properties of specimens in all directions on tensile testing are higher than those of steels having other textures. Sheet with {111} texture has little planer anisotropy for "re-formability". KTS sheet is a cold-rolled rimmed steel in which small amounts of special elements such as P, Sb and Bi etc. are added and the amounts of carbon and nitrogen are extremely decreased by open coil annealing, and its properties for press-formability described above are much superior than those of ordinary aluminum-killed steel for deep drawing quality. |
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