JPS55147448A - Head forming method of eyebolt for clamping - Google Patents
Head forming method of eyebolt for clampingInfo
- Publication number
- JPS55147448A JPS55147448A JP5334479A JP5334479A JPS55147448A JP S55147448 A JPS55147448 A JP S55147448A JP 5334479 A JP5334479 A JP 5334479A JP 5334479 A JP5334479 A JP 5334479A JP S55147448 A JPS55147448 A JP S55147448A
- Authority
- JP
- Japan
- Prior art keywords
- head part
- pressure
- lower dies
- blank
- sandwiched
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Forging (AREA)
Abstract
PURPOSE: To make the head part stronger than thread part within the limited size by forming the upper half of the circular head part to the specific shape and subjecting the base metal bulged by pressure-sandwiching to compression plastic deformation by the upper die at the time of forming the circular head part for shaft hole being flat at the front and rear through pressure-sandwiching of the upper and lower dies to the end part of a round bar blank.
CONSTITUTION: A steel round bar blank 1 of the diameter conforming to the thread part of a clamp bolt for assembling scaffolding steel pipes or the like is pressure-sandwiched in the axial direction by upper and lower dies 2, 3 in the preliminary process of cold pressing. At this time the portions which become the front and rear planes of the bye bolt head part are defined of bulging by inside walls 2a, 3a. Next, it is pressure-sandwiched in the axial direction by upper and lower dies 5, 6 in the finishing process so that the entire region of both edge parts 7a of the outside circumferential surface of the upper half of the circular head part or the region other than said peak part is formed to a circular peak part 7 lower than its central strip-form region 7b. The blank is then pressure-sandwiched by the upper, lower dies 5, 6 until the blank base metal bulging at the molding contacts the upper die inside surface forming both edge parts 7a and causes compression plastic deformation. This lets both edge 7a surfaces be compression fortified. The forging flashes 4, 8 in the fore- and post-processes are removed and a shaft hole is opened in the head part.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5334479A JPS55147448A (en) | 1979-05-02 | 1979-05-02 | Head forming method of eyebolt for clamping |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5334479A JPS55147448A (en) | 1979-05-02 | 1979-05-02 | Head forming method of eyebolt for clamping |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55147448A true JPS55147448A (en) | 1980-11-17 |
JPS5615984B2 JPS5615984B2 (en) | 1981-04-14 |
Family
ID=12940142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5334479A Granted JPS55147448A (en) | 1979-05-02 | 1979-05-02 | Head forming method of eyebolt for clamping |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55147448A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01228636A (en) * | 1988-03-07 | 1989-09-12 | Susumu Ito | Multistep cold forging method for eye bolt |
CN100368653C (en) * | 2006-06-02 | 2008-02-13 | 丹阳市利普机械配件厂 | Bowl fastening type up bowl of scaffold, and forging method |
JP2009014049A (en) * | 2007-07-03 | 2009-01-22 | Kunimoto Co Ltd | Bolt, nut and processing method for bolt |
KR100965306B1 (en) * | 2007-07-02 | 2010-06-22 | 김재중 | Forging mold for manufacturing T-slot bolt |
JP2015136787A (en) * | 2014-01-21 | 2015-07-30 | ブ チョン プレシジョン メタル カンパニー,リミテッド | Forming apparatus and method of smart fastener for clamp and smart fastener for clamp formed through the same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57150780U (en) * | 1981-03-17 | 1982-09-21 |
-
1979
- 1979-05-02 JP JP5334479A patent/JPS55147448A/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01228636A (en) * | 1988-03-07 | 1989-09-12 | Susumu Ito | Multistep cold forging method for eye bolt |
CN100368653C (en) * | 2006-06-02 | 2008-02-13 | 丹阳市利普机械配件厂 | Bowl fastening type up bowl of scaffold, and forging method |
KR100965306B1 (en) * | 2007-07-02 | 2010-06-22 | 김재중 | Forging mold for manufacturing T-slot bolt |
JP2009014049A (en) * | 2007-07-03 | 2009-01-22 | Kunimoto Co Ltd | Bolt, nut and processing method for bolt |
JP2015136787A (en) * | 2014-01-21 | 2015-07-30 | ブ チョン プレシジョン メタル カンパニー,リミテッド | Forming apparatus and method of smart fastener for clamp and smart fastener for clamp formed through the same |
Also Published As
Publication number | Publication date |
---|---|
JPS5615984B2 (en) | 1981-04-14 |
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