Apparatus and method for ram bending of tube material

摘要

The present invention provides a new bending apparatus and bending method of a tube material which makes it possible to achieve all of bending by a large bending radius not requiring large scale equipment or die, bending resistant to wrinkling and buckling at an inner side of the bending, and bending with a high productivity, that is, a ram bending apparatus using a punch 12 and a set of rolls 13, 13 for three-point bending of a tube material wherein the punch 12 has a groove 12a of a width of the width of a circular tube 11 or more and wherein the set of rolls 13, 13 are supported by a frame 14. The rolls 13, 13 can freely move on the frame 14 in directions away from each other in a state contacting the punch 12. The frame 14 has a hollow space 14a enabling free movement of the descending punch 12 and the circular tube 11 bent along with this during the bending of the circular tube 11.

主权项

1. A ram bending apparatus for bending tube material, the apparatus comprising:
a punch and a set of rolls for three-point bending a tube material, wherein the punch has a groove, the punch groove having a width equal to at least a width of the tube material outer circumference, the set of rolls is supported by a frame, the set of rolls is between the punch and the frame, the set of rolls is configured to be in contact with the punch and the frame and configured to slide on the frame away from each other while contacting the punch when the tube material is in contact with the rolls and the punch, wherein each said roll has at its center part a groove having a width equal to at least a width of the tube material outer circumference, and the frame has a hollow part sufficiently wide to permit the punch and the tube material to freely move within the hollow part during bending of the tube material, and wherein the punch is in contact with the set of rolls from start to finish of the ram bending.