公开(公告)号：US4564119A

公开(公告)日：1986-01-14

申请号：US679383

申请日：1984-12-07

申请人： Mitsuo Tsuge ,  Shigeru Kohmura ,  Keiichi Sugiyama ,  Hisao Saitoh ,  Shigenori Saitoh

发明人： Mitsuo Tsuge ,  Shigeru Kohmura ,  Keiichi Sugiyama ,  Hisao Saitoh ,  Shigenori Saitoh

IPC分类号： B65D17/34

CPC分类号： B65D17/165

摘要： The can end is formed with a circular severing score for severing the area defined thereby from the can end by pulling a manipulating tab secured within the area defined by the score at a position adjacent thereto. In order to increase the pressure resisting strength against the internal pressure caused by the content in the can, the can end is made from a thin aluminum alloy sheet having the yield strength in the range of 24-29 kgf/mm.sup.2 as well as the elongation equal to or greater than 6%, while the aperture rate defined by the ratio of the area formed within the score with respect to the total area of the can end is made at least equal to or greater than 60% so that the pressure resisting strength is kept substantially at least 5 kgf/cm.sup.2. In order to more advantageously maintain the high pressure resisting strength of the can, score is located at a position spaced from the inner periphery of the bottom of the frustoconical portion at least a distance equal to or greater than 1 mm inwardly of the area of the can end, to make the inner radius of curvature of the corner formed around the inner periphery of the bottom of the frustoconical portion equal to or less than 0.5 mm, and to make the taper angle of the frustoconical portion of the can end equal to or less than 10.degree.. An auxiliary score having a score residual smaller than that of the score for severing the area defined thereby from the can end may be formed outwardly or inwardly of the score for severing. The score residual of the can end may be preferably increased from the thinnest portion adjacent to the position where the tab is provided while a plurality of elongated ridges or grooves may be formed within the area defined by the score substantially perpendicular to the line passing through the tab and the center of the can end in order to avoid rapid severing of the area defined by the score from the can end so as to prevent spilling of the content out of the can when the can end is being opened. All these measures are effective to most advantageously enhance the pressure resisting strength of the can end.

公开(公告)号：US5743124A

公开(公告)日：1998-04-28

申请号：US747703

申请日：1996-11-12

申请人： Keiichi Sugiyama ,  Mitsuo Tsuge ,  Tadashi Hakamada ,  Masayoshi Ohhashi ,  Kunihiro Yasunaga

发明人： Keiichi Sugiyama ,  Mitsuo Tsuge ,  Tadashi Hakamada ,  Masayoshi Ohhashi ,  Kunihiro Yasunaga

IPC分类号： B21D7/00 ,  B21D7/025 ,  B21D7/14 ,  B21D5/06

CPC分类号： B21D7/14 ,  B21D7/025 ,  Y10S72/702

摘要： A method of bending extruded shapes of the present invention controls a bending radius and a bending angle in accordance with a moving distance of a movable bending die. In the bending process, hardness of an extruded shape to be processed is measured and converted into proof stress, and the bending condition for compensating the springback is determined. A correction coefficient C showing a ratio of a practical value of the moving distance and a theoretical value of the moving distance in a case of no spring-back occurring is defined by a function of Young's modulus E, geometrical coefficient Z, bending radius R and proof stress .sigma..sub.0.2 for the extruded shape to be processed. The correction coefficient C is obtained by measuring the hardness of the extruded shape to be processed, converting the measured hardness into the proof stress, and substituting the proof stress and a predetermined bending radius R into the function, and the practical value of the moving distance of the movable bending die is determined.

摘要翻译： 本发明的弯曲挤压形状的方法根据可动弯曲模具的移动距离来控制弯曲半径和弯曲角度。 在弯曲过程中，测量待加工的挤出形状的硬度，并将其转化为证明应力，并且确定用于补偿回弹的弯曲条件。 表示在弹跳不发生的情况下移动距离的实际值与移动距离的理论值之比的校正系数C由杨氏模量E，几何系数Z，弯曲半径R和 挤出形状的加工抗力σσ0.2。 校正系数C是通过测定被加工的挤出形状的硬度，将测定的硬度转换为有效应力，将试验应力和规定的弯曲半径R代入功能而得到的，移动距离的实用值 确定可动弯曲模具。