Invention Grant
- Patent Title: Manufacturing method of cylindrical member and manufacturing method of vibration damping rubber bushing having the cylindrical member
- Patent Title (中): 圆柱形构件的制造方法和具有圆柱形构件的减振橡胶衬套的制造方法
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Application No.: US12821429Application Date: 2010-06-23
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Publication No.: US08211348B2Publication Date: 2012-07-03
- Inventor: Norimasa Kuki , Yoshikane Akiyama , Mitiharu Hikosaka , Kazuhiko Kato , Kazumasa Sekido , Daisuke Ueda , Harumi Niwa , Hiroshi Itazu , Yuji Mizuno
- Applicant: Norimasa Kuki , Yoshikane Akiyama , Mitiharu Hikosaka , Kazuhiko Kato , Kazumasa Sekido , Daisuke Ueda , Harumi Niwa , Hiroshi Itazu , Yuji Mizuno
- Applicant Address: JP Komaki-shi JP Nagoya-shi
- Assignee: Tokai Rubber Industries, Ltd.,Sekido Kiko Mfg. Co., Ltd.
- Current Assignee: Tokai Rubber Industries, Ltd.,Sekido Kiko Mfg. Co., Ltd.
- Current Assignee Address: JP Komaki-shi JP Nagoya-shi
- Agency: Oliff & Berridge, PLC
- Priority: JP2009-154036 20090629
- Main IPC: B28B1/02
- IPC: B28B1/02

Abstract:
A method of manufacturing a cylindrical member having anti-slip projections formed on axial end faces, the method comprising the steps of: employing a roller die, which is provided with a circumferential die groove of annular form extending through a medial section in a generatrix direction of a die face defined by an integral tapered outside peripheral face, and with a plurality of sloping die grooves extending in a tapered slope direction of the die face situated to both large-diameter and small-diameter sides of the circumferential die groove; providing plastic working to the axial end face with the small-diameter side of the roller die facing towards an inner peripheral side of the cylindrical member and with the large-diameter side facing towards an outer peripheral side, by pushing the die face against the axial end face while rotating circumferentially; and forming simultaneously an annular water barrier projection and the anti-slip projections.
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