Method and device for manufacturing bolt, screw rolling die...

Details Method and device for manufacturing bolt, screw rolling die... Method and device for manufacturing bolt, screw rolling die...

2007-01-09

2007-01-09

Tolan, Ed (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C470S010000, C470S066000, C470S070000, C470S185000, C072S104000

Reexamination Certificate

active

10549898

ABSTRACT:
A method and apparatus for manufacturing a bolt capable of mass-producing a multiple screw bolt such as a so-called double screw bolt at a low unit price, and a thread rolling die for use therein. The apparatus for manufacturing a bolt comprises a pair of thread rolling dies (1) which are arranged opposite to each other at a predetermined interval, and a bolt supporting unit (2) which supports a cylindrical bolt material (3) in a predetermined position. The thread rolling dies (1) are provided with a transfer pattern (4) having a coarse thread portion (5) which is part of a coarse thread formed by developing a coarse screw, and projections (6) which are part of a fine thread (6a) formed by developing a fine screw as shown by an imaginary line (6a), the fine thread (6a) being formed cyclically on a root portion (5a) of the coarse thread according to a phase shift between the fine thread and the coarse thread.

REFERENCES:
patent: 4237948 (1980-12-01), Jones et al.
patent: 6149363 (2000-11-01), March
patent: 6216510 (2001-04-01), Hashimoto
patent: 2003/0156921 (2003-08-01), Nagawa et al.
patent: 2003-232326 (2003-08-01), None
patent: 2003-260532 (2003-09-01), None
patent: 02/077466 (2002-10-01), None

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