BEARING RING MANUFACTURING METHOD - NTN TOYO BEARING CO LTD

Title:

BEARING RING MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2017/043304

Kind Code:

A1

Abstract:

This bearing ring manufacturing method comprises a first step of placing steel material heated to a temperature above the A1 transformation point on a forming table, and a second step of forming and quenching a ring member after punching out the ring member from the steel on the forming table. A press die (30) is configured to be separable into an inner cylinder (30B) and an outer cylinder (30A). In the second step, a ring member (2A) is punched from coil material (2) by way of the distal end of the inner cylinder (30B) and the distal end of the outer cylinder (30A) being pressed into the coil material (2). The forming process and the quenching process for the punched-out ring member (2A) is performed by the tip of the inner cylinder (30B) being pressed further into the ring member (2A) while the ring member (2A) is being held between the outer cylinder (30A) and a forming die (32). Thus, it is possible to provide a bearing ring manufacturing method that maintains good forming precision for bearing rings and further shortens the manufacturing process.

More Like This:

JP2010286399	METHOD FOR FINISHING RACEWAY OF SPHERICAL ROLLER BEARING AND RACEWAY SURFACE MEASURING INSTRUMENT FOR SPHERICAL ROLLER BEARING
JP3550208	RECTILINEAR MOTION GUIDE DEVICE AND FORMING METHOD THEREFOR
JP2002054642	SINGLE ROW AND DEEP GROOVE RADIAL BALL BEARING

Inventors:

MIZUTA KOHEI (JP)
OHKI CHIKARA (JP)

Application Number:

PCT/JP2016/074476

Publication Date:

March 16, 2017

Filing Date:

August 23, 2016

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NTN TOYO BEARING CO LTD (JP)

International Classes:

F16C33/64; B21D22/20; B21D24/16; B21D28/00; B21D28/14; B21D53/10; C21D1/18; C21D9/00; C21D9/40; F16C19/30; F16C19/46; C21D1/40; C21D1/42

Foreign References:

JP2007170447A	2007-07-05
JP2003004051A	2003-01-08
JPH07265987A	1995-10-17
US20130136387A1	2013-05-30

Other References: