JPH0390238A - Bearing stock for cold rolling - Google Patents

Bearing stock for cold rolling

Info

Publication number
JPH0390238A
JPH0390238A JP22642789A JP22642789A JPH0390238A JP H0390238 A JPH0390238 A JP H0390238A JP 22642789 A JP22642789 A JP 22642789A JP 22642789 A JP22642789 A JP 22642789A JP H0390238 A JPH0390238 A JP H0390238A
Authority
JP
Japan
Prior art keywords
groove
peripheral
rolling
stock
mandrel
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
JP22642789A
Other languages
Japanese (ja)
Inventor
Fujiya Suzuki
Yasuo Fujioka
Shunichi Okura
Original Assignee
Ntn Corp
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 Ntn Corp filed Critical Ntn Corp
Priority to JP22642789A priority Critical patent/JPH0390238A/en
Publication of JPH0390238A publication Critical patent/JPH0390238A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To clear away the anxiety of generation of a crack by forming a groove being similar to a prescribed ball receiving groove shape on the corresponding peripheral surface of an annular stock.
CONSTITUTION: When a protesting part d1 of a mandrel (d) is matched to a groove 2, and a shaft rotation accompanied with pressure of a main roll (f) is started, the mandrel (d) is brought to shaft rotation and by this projecting bar d1, the part of the groove 2 is brought to rolling, and also, a ring-like part of a stock 1 is thinned. In this case, almost simultaneously with a start of rolling of the groove 2, the inside peripheral surface 3 of the stock 1 which is not related directly to formation of the groove comes into contact with other peripheral body than the projecting bar d1 of the mandrel (d), and this inside peripheral surface 3 is also rolled in the diameter direction. Accordingly, rolling of the inside peripheral surface 3 is executed quickly and becomes densified and even if the diameter expansion rate is small, a desired product (bearing constituting ring body) is obtained and an anxiety of generation of a crack is swept off. In such a way, the merit on the accuracy of cold rolling can be maintained.
COPYRIGHT: (C)1991,JPO&Japio
JP22642789A 1989-08-31 1989-08-31 Bearing stock for cold rolling Pending JPH0390238A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22642789A JPH0390238A (en) 1989-08-31 1989-08-31 Bearing stock for cold rolling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22642789A JPH0390238A (en) 1989-08-31 1989-08-31 Bearing stock for cold rolling

Publications (1)

Publication Number Publication Date
JPH0390238A true JPH0390238A (en) 1991-04-16

Family

ID=16844952

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22642789A Pending JPH0390238A (en) 1989-08-31 1989-08-31 Bearing stock for cold rolling

Country Status (1)

Country Link
JP (1) JPH0390238A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016043404A (en) * 2014-08-26 2016-04-04 日本精工株式会社 Manufacturing method and manufacturing apparatus for ring-like member

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5334667A (en) * 1976-09-11 1978-03-31 Le Borichiefuechiesukii I Imee Process for forming ring blank
JPS59212142A (en) * 1983-05-17 1984-12-01 Kyoei Seikou Kk Forming method of ring body for bearing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5334667A (en) * 1976-09-11 1978-03-31 Le Borichiefuechiesukii I Imee Process for forming ring blank
JPS59212142A (en) * 1983-05-17 1984-12-01 Kyoei Seikou Kk Forming method of ring body for bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016043404A (en) * 2014-08-26 2016-04-04 日本精工株式会社 Manufacturing method and manufacturing apparatus for ring-like member

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