SCREW COMBINATION WORKING ALONG FORMER APPARATUS Russian patent published in 2006 - IPC B23P23/04 

FIELD: machine engineering, working precise screws of hard-to-form materials.

SUBSTANCE: apparatus includes diamond-abrasive disc with individual drive. Thickness of former is selected equal to pitch of worked screw. Former is designed for securing to end of blank and probe engaged with it is in the form of friction disc for friction surface hardening. Friction disc is mounted through elastic member by means of flanges in shaft of individual electric drive, arranged diametrically opposite relative to diamond-abrasive disc and spaced from the last in lengthwise direction by distance equal to pitch of worked screw. Radius of working surface in longitudinal section of friction disc is equal to radius of peripheral working surface in longitudinal section of diamond-abrasive disc. Friction disc is designed for using as m movable rest and it is forced to blank by effort equal to cutting force generated by diamond-abrasive disc.

EFFECT: enlarged manufacturing possibilities, enhanced efficiency, quality and accuracy of working.

6 dwg, 1 ex