PROCEDURE FOR CENTRIFUGAL STRENGTHENING OF SCREWS Russian patent published in 2010 - IPC B24B39/04 B21H3/12 

FIELD: machine building.

SUBSTANCE: facility is rotated for surface plastic deformation and is lengthwise fed. A treated screw is driven to rotation. The facility for surface plastic deforming consists of a disk with radial slots made in form of pneumatic cylinders wherein deforming elements made as two-step rollers are installed. Each of two-step rollers is made with a step of smaller diametre in form of a rod of the pneumatic cylinder and with a step of bigger diametre in form of a piston equipped with a groove and a packing ring; the piston is installed in the pneumatic cylinder. A ring with holes is fixed on periphery surface of the disk; the holes facilitate free passage of steps of smaller diametre of the two-step rollers through them and retain the rollers in radial slots of the disk. Also ends of rods impact surface of the screw and perform plastic deforming.

EFFECT: expanded process functionality, raised efficiency and reduced expenditures.

4 dwg, 1 ex, 1 tbl