巻号一覧
48 巻, 11 号
選択された号の論文の8件中1～8を表示しています
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解説
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胡 建国, 石川 孝司1998 年 48 巻 11 号 p. 540-547
発行日: 1998年
公開日: 2007/03/30
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桑原 利彦1998 年 48 巻 11 号 p. 548-555
発行日: 1998年
公開日: 2007/03/30
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仲町 英治1998 年 48 巻 11 号 p. 556-562
発行日: 1998年
公開日: 2007/06/01
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研究論文
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胡 建国, 村上 糺, 池田 圭介1998 年 48 巻 11 号 p. 563-568
発行日: 1998年
公開日: 2007/03/30
ジャーナル フリーIn this study, plastic anisotropy of typical preferred orientations appeared in textured aluminum and its alloy sheets is predicted according to the finite strain analysis where slip deformation is treated as simple shear. The obtained results are summarized as follows: 1) There exist the orientations of which the plastic anisotropy parameter, r is impossible to be fixed immediately after yielding. This is a logical conclusion in consideration of the yield locus. 2) The r values of the main retained-texture components, {011}<211>, {123}<634> and {112}<111>, vary with tensile strain. Especially, r45 of the {011}<211> and {112}<111> components depends largely on tensile strain. 3) The retained-texture components show maximum r values more than unity in 45° direction. In contrast, the cube component has a minimum in the same direction. 4) The r0 and r90 values of textured aluminum and its alloy sheets show little dependence on tensile strain, while the strain dependence of r45 is large. Such a trend is in good agreement with the experimental results.抄録全体を表示PDF形式でダウンロード (821K) -
大上 哲郎, 臼田 松男, 佐賀 誠, 菊池 正夫1998 年 48 巻 11 号 p. 569-575
発行日: 1998年
公開日: 2007/03/30
ジャーナル フリーInfluence of hydraulic counter pressure forming and teflon (polytetrafuluoroethylene) lubricant forming on the cylindrical deep drawability of various aluminum alloy sheets is investigated. 8 type of aluminum alloy sheets (Al–Mg, Al–Mg–Cu, Al–Mg–Si and Al–Mg–Si–Cu) and a cold rolled steel sheet (SPCC, commercial quality) are used for testing materials. In conventional forming, aluminum alloy sheet with thin Fe–Zn coat shows maximum LDR (limiting drawing ratio) same as LDR of SPCC. In hydraulic counter pressure forming and conventional forming, LDR increases corelatively with surface roughness. In case of large surface roughness materials, LDR of hydraulic counter pressure forming becomes largest, 2'nd is that of teflon lubricant forming and 3'rd is that of conventional forming. However at small surface roughness material, such as bright sheet, LDR of teflon lubricant forming becomes largest. In cylindrical deep drawing of aluminum alloy sheets, with hydraulic counter pressure forming, large surface roughness and thin surface coat are very effective.抄録全体を表示PDF形式でダウンロード (1028K) -
中村 和彦, 小原 英隆1998 年 48 巻 11 号 p. 576-580
発行日: 1998年
公開日: 2007/03/30
ジャーナル フリーThe deep drawing height of an aluminum alloy sheet on a truncated conical shell using the hydraulic counterpressure is determined by the intersection of the body wrinkling limit line occurred in the lower zone of blank holding force with the fracture limit line occurred in the higher zone. When applied the hydraulic counterpressure, the fracture limit line can be raised and the depression effect of body wrinkling is achieved, therefore, the limit height of deep drawing is increased compared to that in the conventional drawing method. Particularly, the nearer the ratio of head- and bottom diameters approaches 1 in a truncated conical shape, the greater the effect of hydraulic counterpressure is. In a shape of which ratio of head and bottom diameters is small, a method is effective to pressurize with an auxiliary pump from the initial stage of stroke. However, when the value of initial hydraulic pressure is too high, fracture may occur due to an excess bulged deformation. Accordingly, there exists an appropriate value of hydraulic pressure. The hydraulic counterpressure method is effective for the deep drawing of aluminum alloy sheet on the truncated conical shell. Compared to the conventional drawing method for the SPCD sheet, the height of deep drawing can be obtained a similar height in the shape in which the ratio of the head- and bottom diameters is 0.4, heights 1.22 times in the ratio of 0.6 and 1.96 times in 0.8.抄録全体を表示PDF形式でダウンロード (862K) -
宇都宮 裕, 斎藤 好弘, 左海 哲夫, 松枝 茂幹, 関野 貴夫1998 年 48 巻 11 号 p. 581-584
発行日: 1998年
公開日: 2007/03/30
ジャーナル フリーA rolling method to increase the width of materials would have advantages in multi-width strip production, yield efficiency, productivity and texture control. The authors proposed a new method for spread rolling of thin and wide strip. The method employs 3-pass caliber rolling, where several portions of the width are reduced. In this study, the method was applied to commercial 1050 Aluminum strips. Necking or fracture occurred at thin portions near edges. In order to prevent the occurrence of defects, the method is improved to the 5-pass rolling method. It is found that the 5-pass rolling is effective in lateral spread as well as in preventing in defects formation. Thin aluminum strips with an aspect ratio (width/thickness) of 100 are successfully widened up to 3% by 30%–reduction rolling. As for the mechanical properties of rolled strips, the spread strips are slightly work-hardened than those of the flat strip. Development of rolling texture is not so remarkable in the spread strips as that in the flat-rolled strips. It is concluded that the proposed spread rolling method can control the texture as well as the width of rolled strips.抄録全体を表示PDF形式でダウンロード (786K) -
前田 恭志, 柳川 政洋, 松井 邦昭, 吉澤 成則, 服部 重夫, 石川 孝司, K. CHUNG, F. BARLAT, S. J. M ...1998 年 48 巻 11 号 p. 585-590
発行日: 1998年
公開日: 2007/03/30
ジャーナル フリーCrystallographic texture is an important material characteristic for the formability of Aluminum alloys. The r-value is well known as a good index of formability for steel. However, there is no such index for aluminum alloys. In this paper, we discuss forming limit strains at the bi-axial region as the formability. We will discuss such an index for aluminum alloys by using numerical simulation and data analysis, in the following steps: Experimentally, we determined a yield function. Such functions can predict the yield surfaces and r-value distributions. Examining the experimental data, we confirmed the reliability of prediction of forming limit strains to predict forming limit strains by using the M–K model. Finally, we will propose a simple linear equation by using mean r-value, Δr-value and work hardening parameters. This equation can separate texture effect and work hardening effect on the forming limit strains. This equation well predicts the formability for 11 examined Al–Mg alloys.抄録全体を表示PDF形式でダウンロード (864K)
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