JPS5514176A - Cold forming method of non-tempered high tension bolt - Google Patents

Cold forming method of non-tempered high tension bolt

Info

Publication number
JPS5514176A
JPS5514176A JP8730378A JP8730378A JPS5514176A JP S5514176 A JPS5514176 A JP S5514176A JP 8730378 A JP8730378 A JP 8730378A JP 8730378 A JP8730378 A JP 8730378A JP S5514176 A JPS5514176 A JP S5514176A
Authority
JP
Japan
Prior art keywords
bolt
hardness
punch
head
head part
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
JP8730378A
Other languages
Japanese (ja)
Inventor
Shigeo Obara
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP8730378A priority Critical patent/JPS5514176A/en
Publication of JPS5514176A publication Critical patent/JPS5514176A/en
Pending legal-status Critical Current

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  • Forging (AREA)

Abstract

PURPOSE: To make the hardness of bolt head part below a fixed value, prevent the decrease in the life of a punch and prevent the head part from fracturing from the stem part by using steel material of 0.10 to 0.30% of C as raw material and fabricating the same to the bolt through cold forging by the specific reduction of area.
CONSTITUTION: A steel wire 1 made of carbon steel or alloy steel containing C; 0.10 to 0.30% is force-inserted into a hole die 2 directly or after its tensile strength has been intensified to 60 to 85 kg/mm2 through drawing. This is subjected to axial drawing only at the cold forging of less than 30% in reduction of area to make the tensile strength of the bolt stem part 70 to 110 kg/mm2. Next, this work 1' is inserted into a die hole 3 to punch the head part at above upset rate 70%, whereby it is formed stepwise to a hexagonal shape. The head center hardness of this time becomes a value of 400 or under in Vicker's hardness from the C-content, thus the decrease in the life of the punch owing to excessive hardness and the head breakage of the bolt are prevented.
COPYRIGHT: (C)1980,JPO&Japio
JP8730378A 1978-07-18 1978-07-18 Cold forming method of non-tempered high tension bolt Pending JPS5514176A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8730378A JPS5514176A (en) 1978-07-18 1978-07-18 Cold forming method of non-tempered high tension bolt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8730378A JPS5514176A (en) 1978-07-18 1978-07-18 Cold forming method of non-tempered high tension bolt

Publications (1)

Publication Number Publication Date
JPS5514176A true JPS5514176A (en) 1980-01-31

Family

ID=13911050

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8730378A Pending JPS5514176A (en) 1978-07-18 1978-07-18 Cold forming method of non-tempered high tension bolt

Country Status (1)

Country Link
JP (1) JPS5514176A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2841947A1 (en) * 2002-07-05 2004-01-09 Valmex STEEL SCREW WITH HOLLOW HEAD
KR100931200B1 (en) 2007-12-24 2009-12-10 주식회사 포스코 Method and apparatus for manufacturing high strength bolt using extrusion process
ES2394400A1 (en) * 2009-05-12 2013-01-31 Metagra Bergara, S.A. Method for manufacturing fixing members adapted for railway sleepers by cold forming
CN109909410A (en) * 2019-04-11 2019-06-21 无锡派克新材料科技股份有限公司 A kind of forging method improving aluminum alloy round dish-shaped forgings flaw detection qualification rate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4965317A (en) * 1972-10-27 1974-06-25
JPS5210819A (en) * 1975-06-12 1977-01-27 Kiyoshi Inoue Malleable high permeability alloy for high frequency

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4965317A (en) * 1972-10-27 1974-06-25
JPS5210819A (en) * 1975-06-12 1977-01-27 Kiyoshi Inoue Malleable high permeability alloy for high frequency

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2841947A1 (en) * 2002-07-05 2004-01-09 Valmex STEEL SCREW WITH HOLLOW HEAD
WO2004004944A3 (en) * 2002-07-05 2004-04-15 Valmex Steel hollow-head screw
CN100374228C (en) * 2002-07-05 2008-03-12 瓦尔梅克斯公司 Steel hollow head bolt
KR100931200B1 (en) 2007-12-24 2009-12-10 주식회사 포스코 Method and apparatus for manufacturing high strength bolt using extrusion process
ES2394400A1 (en) * 2009-05-12 2013-01-31 Metagra Bergara, S.A. Method for manufacturing fixing members adapted for railway sleepers by cold forming
CN109909410A (en) * 2019-04-11 2019-06-21 无锡派克新材料科技股份有限公司 A kind of forging method improving aluminum alloy round dish-shaped forgings flaw detection qualification rate

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