TOOL FOR EXPANDING HOLES Russian patent published in 1995 - IPC

FIELD: plastic metal working. SUBSTANCE: tool has rollers, mounted at separator at angle of self-feed for interaction with support cone of the case. The case is made with radial and axial channels for lubricant-coolant. The tool is provided with is tied rigidly with the separator and with case, which is mounted in align with the case, as well as friction disks, flexible elements, which interacts with edge surface of one disk, annular plunger, which is spring-loaded relatively the separator. Cavities are made along the edges of the support cone. Radial channels are made in the separator. The plunger is mounted inside one cavity for overlapping radial channels of case and separator. Rollers are made hollow and disposed onto the axes. Surface of the rollers is formed by two conical surfaces. Diameter of common base of conical surfaces is equal to diameter of the axis. EFFECT: improved efficiency. 2 cl, 2 dwg