JPS57112914A - Shaping device for outer and inner surface of metallic pipe - Google Patents

Abstract

PURPOSE: To shape the outer and inner surfaces of the pipe into prescribed shapes as well as making the diameter of a pipe contracted by moving the metallic pipe in the direction of its axial line, by making feed rolls, rolling rolls and guide rolls, which are inclined to the axial line of the pipe, rotatingly press-contacted with a working part of a mandrel in the metallic pipe from the outside of the pipe.

CONSTITUTION: A mandrel 24 is positioned in the inside of a metallic pipe 7 which is inserted into the inside central part of each of rolls 4, 3 through a through hole 14 of a gear 13 under such condition as the inside spaces of feed rolls 4, rolling rolls 3, and guide rolls 5 are respectively enlarged by a cylinder mechanism 2. Next, the rolls 4, 3, 5 are rotated respectively through a gear 19 and universal joints 21, 22 by driving a driving source 18 to rotate a gear 13 through a belt 16. Next, the mechanism 2 is actuated to make the rolls 4 press-contact with the pipe 7 and to make the rolls 3 press the pipe 7 against a working part 25 of a mandrel 24 to contact the dia. of the pipe 7. At this time, the component of frictional force in the direction of the axial line 8 moves the pipe 7 in the direction of said axial line 8 to shape the outer and inner surfaces of the pipe into prescribed shapes, because the rolls 4, 3 are inclined at an angle θ to the axial line 8 of the pipe 7.

COPYRIGHT: (C)1982,JPO&Japio