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Title:
FORM-ROLLING METHOD
Document Type and Number:
Japanese Patent JP2012081491
Kind Code:
A
Abstract:

To obtain a favorable form-rolling accuracy even if there are change and variation in material of a workpiece.

There are previously set: a pre-form-rolling command distance presetting a distance between screw-machining dies 21, 23 for a workpiece specification; and a post-form-rolling command distance prescribing a distance between flat dies 22, 24 as a function of a radial force measured by form-rolling multiple different workpieces 4 with the pre-form-rolling command distance. The workpiece 4 is pre-form-rolled with the screw-machining dies 21, 23 in the pre-form-rolling command distance, and the radial force is measured. The post-form-rolling command distance is obtained by a function from the measured radial force. The workpiece is post-(finish-)form-rolled by correcting and setting the distance between the flat dies 22, 24 to the obtained post-form-rolling command distance.


Inventors:
MURAI YASUHIRO
TAKIMOTO SHINYA
Application Number:
JP2010228492A
Publication Date:
April 26, 2012
Filing Date:
October 08, 2010
Export Citation:
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Assignee:
NACHI FUJIKOSHI CORP
International Classes:
B21H1/00; B21H3/04; B21H3/06; B21H5/00; B21H7/18
Domestic Patent References:
JPS6376731A1988-04-07
JP2003285135A2003-10-07
JP2003154497A2003-05-27
JPH10118733A1998-05-12
JPS636296B21988-02-09
JPH04187337A1992-07-06
Attorney, Agent or Firm:
Akiko Okajima