JPS5484861A - Punch for burring method - Google Patents

Punch for burring method

Info

Publication number
JPS5484861A
JPS5484861A JP15255977A JP15255977A JPS5484861A JP S5484861 A JPS5484861 A JP S5484861A JP 15255977 A JP15255977 A JP 15255977A JP 15255977 A JP15255977 A JP 15255977A JP S5484861 A JPS5484861 A JP S5484861A
Authority
JP
Japan
Prior art keywords
punch
cut
metal plate
piercing
piercing portion
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.)
Pending
Application number
JP15255977A
Other languages
Japanese (ja)
Inventor
Kazuo Shibata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP15255977A priority Critical patent/JPS5484861A/en
Publication of JPS5484861A publication Critical patent/JPS5484861A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: A punch which enables to from a cylindrical projection on a method plate with a high productivity by making an opening as a prepared hole without producing slugs by means of the piercing portion of the punch and then forming an bulged section with the tapered portion of the punch.
CONSTITUTION: When a punch 1 is lowerd toward a metal plate placed on a die 6, initially, a straeght edge 3a of the piercing portion thereof forms a straight cut on the metal plate and then the cut is further widened with the piercing portion as the punch lowers. Then, the upper half of the smaller diameter portion of the punch passes through the cut portion with the piercing portion, the tapered section 5 expands the area around the cut downward. Subsequently, in cooperation with the die, the finishing portion 4 finishes the expanded portion in a cylindrical shape. Thereafter, the punch 1 is raised. In this manner, a cylindrical projection 11 is formed on the metal plate 8 with a protruded piece left.
COPYRIGHT: (C)1979,JPO&Japio
JP15255977A 1977-12-19 1977-12-19 Punch for burring method Pending JPS5484861A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15255977A JPS5484861A (en) 1977-12-19 1977-12-19 Punch for burring method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15255977A JPS5484861A (en) 1977-12-19 1977-12-19 Punch for burring method

Publications (1)

Publication Number Publication Date
JPS5484861A true JPS5484861A (en) 1979-07-06

Family

ID=15543114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15255977A Pending JPS5484861A (en) 1977-12-19 1977-12-19 Punch for burring method

Country Status (1)

Country Link
JP (1) JPS5484861A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725221A (en) * 1980-07-21 1982-02-10 Ageo Seimitsu Kk Production of hand for watch
JPS6096328A (en) * 1983-10-27 1985-05-29 Sanyo Electric Co Ltd Working method of burring hole
JPS60176827U (en) * 1984-05-07 1985-11-22 三池工業株式会社 Burring punch
JP2008155216A (en) * 2006-12-20 2008-07-10 Oiles Ind Co Ltd Punch for punching sheet metal, sheet metal punching device provided with the punch, and method therefor
JP2009208948A (en) * 2008-03-06 2009-09-17 Ntn Corp Take-up unit with frame

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725221A (en) * 1980-07-21 1982-02-10 Ageo Seimitsu Kk Production of hand for watch
JPS6096328A (en) * 1983-10-27 1985-05-29 Sanyo Electric Co Ltd Working method of burring hole
JPS60176827U (en) * 1984-05-07 1985-11-22 三池工業株式会社 Burring punch
JP2008155216A (en) * 2006-12-20 2008-07-10 Oiles Ind Co Ltd Punch for punching sheet metal, sheet metal punching device provided with the punch, and method therefor
JP2009208948A (en) * 2008-03-06 2009-09-17 Ntn Corp Take-up unit with frame

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