Rolling die for ball screw

Details Rolling die for ball screw Rolling die for ball screw

2006-06-27

2006-06-27

Tolan, Ed (Department: 3725)

Metal deforming

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

During rotation of work

C072S098000, C470S066000, C470S185000

Reexamination Certificate

active

07065996

ABSTRACT:
A rolling die for a ball screw has: a cylindrical portion including a helical protrusion formed in an outer peripheral surface thereof for forming a helical ball groove in a raw material of a screw shaft of the ball screw; and a conical lead-in portion formed in one end portion of the cylindrical portion, the lead-in portion including a plurality of frustum-cone-shaped portions, wherein the contact angles of the frustum-cone-shaped portions with respect to the raw material of the screw shaft are each set so as to increase sequentially in the order starting at and from the frustum-cone-shaped portion adjoining the cylindrical portion.

REFERENCES:
patent: 2720801 (1955-10-01), Erdelyi et al.
patent: 2937547 (1960-05-01), Fritz et al.
patent: 3651678 (1972-03-01), Zook et al.
patent: 3942349 (1976-03-01), Williams et al.
patent: 6708544 (2004-03-01), Sannomiya
patent: 25 52 860 (1976-07-01), None
patent: 202 02 470 (2002-07-01), None
patent: 9-133195 (1997-05-01), None

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