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1. 发明专利

JP2009050912A Cylindrical body manufacturing method and drawn cylindrical body 审中-公开
标题翻译：圆柱体制造方法和拉伸圆柱体
公开(公告)号：JP2009050912A
公开(公告)日：2009-03-12
申请号：JP2007222650
申请日：2007-08-29
申请人： Asmo Co Ltd , アスモ株式会社
发明人： NAGAI TAKASHI , KOYANO DAISUKE , MIURA KAZUHIRO , SUGIMOTO YUKIHISA , NISHIOKA YOSHITAKA
IPC分类号： B21D22/28 , B21D53/00
摘要： PROBLEM TO BE SOLVED: To provide a cylindrical body manufacturing method enabling a cylindrical body to have the desired thickness.
SOLUTION: A motor yoke manufacturing method provides a substantially bottomed cylindrical motor yoke from a plate material by performing multi-stage drawing processes using a die and a punch. In a partial thickness-increasing drawing process to be performed as one of the multi-stage drawing processes, the outer circumference of only a bottom part side of a workpiece is reduced while suppressing the axial elongation (the material flow) of the workpiece by a cushion plate 21 (having the axial length being substantially same as that of the workpiece in the previous stage), the punch 22 and the die 23 and thus, a partially thickness-increased intermediate yoke 11e with the thickness of only the bottom part side in the axial direction of the workpiece being increased can be obtained. Thereafter, the motor yoke is obtained by performing a process substantially similar to a general known drawing process (a poststage drawing process).
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够使圆柱形主体具有所需厚度的圆柱体制造方法。解决方案：电动机轭制造方法通过使用模具和冲头进行多级拉伸工艺，从板材提供基本上有底的圆柱形电动机轭。在作为多级拉伸工序之一进行的局部增厚拉伸加工中，仅在工件的底部侧的外周减少工件的轴向伸长（材料流动）缓冲板21（其轴向长度与前一阶段的工件的轴向长度基本相同），冲头22和模具23以及仅部分厚度的部分厚度增加的中间轭11e的厚度仅在底部侧可以获得工件的轴向增加。此后，通过执行与一般已知的绘制过程（后级绘制处理）基本相似的过程来获得电动机轭。版权所有（C）2009，JPO＆INPIT

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