Method for manufacturing ball screw nut

There is provided a method for forming a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die, even in a case where a nut having a long axial dimension and a small diameter is manufactured. Letter S shaped co...

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Bibliographische Detailangaben
Hauptverfasser:	WATANABE, Atsushi, NAKAMURA, Toshio, OOTSUKA, Kiyoshi, KOBAYASHI, Kazuto, MOGI, Shinobu, YAMASHITA, Tomofumi, HASHIMOTO, Koji, SAITOU, Shingo, YOKOYAMA, Shouji, HARADA, Toru
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING ENGINEERING ELEMENTS AND UNITS FORGE FURNACES FORGING GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HAMMERING HEATING LIGHTING MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	There is provided a method for forming a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die, even in a case where a nut having a long axial dimension and a small diameter is manufactured. Letter S shaped concaves (15, 16) are formed on an inner circumferential surface (11) of a nut blank (1), by a pressing method by use of a die having a blank holder (2), a cam driver (6), cam sliders (7, 8), and a cylindrical member (5). The cam driver (6) has inclined surfaces (61b, 61d) having the same angle of inclination with inclined surfaces (71, 81) of cam sliders (7, 8). The cam sliders (7, 8) have letter S shaped convexes (73, 83) corresponding to the letter S shaped concaves (15, 16), ad are held by through holes (52, 53), respectively. When the cam driver (6) is pressed under pressure from the top thereof, the cam sliders (7, 8) move outwardly in the radial direction, respectively, and the letter S shaped convexes (73, 83) push the inner circumferential surface (11) of the nut blank (1) for plastic deformation.