Four-roller bending and rounding machine

摘要

A tube-making machine has a pair of axially spaced end supports between which upper and lower bending rollers extend axially. These rollers have ends journaled in the supports with the upper roller vertically limitedly displaceable in the support and the lower roller vertically nondisplaceable. A pair of axially extending side rollers horizontally flanking the upper and lower rollers have ends also journaled and vertically limitedly displaceable in the supports. A C-shaped rigid member lying generally in a plane between the supports and perpendicular to the axes of the rollers has rigid upper and lower arms respectively juxtaposed with the upper and lower bending rollers. Respective upper and lower support rollers are urged by respective upper and lower hydraulic cylinders respectively downwardly and upwardly into engagement with the upper and lower bending rollers at the plane to prevent deflection of these rollers during operation of the machine for bending or crimping. The C-shaped member with the support rollers can be pivoted between a position embracing the upper and lower rollers as described above and a position offset therefrom to allow rounding of a tubular workpiece by the machine.