APPARATUS FOR FRICTION SURFACE HARDENING OF SCREWS Russian patent published in 2006 - IPC B24B39/04 

FIELD: manufacturing processes in machine engineering, possibly surface hardening of working surfaces of steel and cast iron parts subjected to intensive wear.

SUBSTANCE: apparatus includes friction disc mounted in shaft of separate drive unit, hydraulic cylinder and rest. Friction disc is made of material with low heat conductivity factor and it has peripheral working surface. Rest includes supporting cylindrical roller whose height is no less than two pitches of hardened screw surface. Friction disc is mounted on shaft of separate drive unit between two flanges by means of elastic member and it is joined with housing of hydraulic cylinder for providing crosswise feed and for pressing to hardened surface of screw by constant effort P_f created by means of hydraulic cylinder. Piston of hydraulic cylinder is made according to condition that effort P_r acts upon rest for balancing effort P_f when P_f = P_r. Friction disc and rest are mounted diametrically opposite relative to cross plane of blank.

EFFECT: enlarged manufacturing possibilities, improved quality and accuracy of hardened surface.

5 dwg, 1 ex