公开(公告)号：US20070017269A1

公开(公告)日：2007-01-25

申请号：US10570363

申请日：2004-02-27

申请人： Eiji Izumi ,  Katsunori Noguchi

发明人： Eiji Izumi ,  Katsunori Noguchi

IPC分类号： B21D9/05

CPC分类号： B21D9/07 ,  B21D7/024

摘要： In the case of bending an outer pipe, a pressure die provided just in front of a bending section is provided with a groove, wherein the shape of the groove on the side far from the bending section is semi-circular and of which the diameter corresponds to that of the outer pipe before bending, while the shape of the groove on the side near the bending section is tapered semi-elliptically. With this, the cross-sectional shape of the outer pipe is caused to change into a substantially elliptical shape in which the outside of the section to be bent is tapered. The cross-sectional shape becomes substantially circular when bending is completed.

摘要翻译： 在弯曲外管的情况下，刚好设置在弯曲部前方的压模设置有槽，其中，在远离弯曲部的一侧的槽的形状为半圆形，并且其直径对应于 与弯曲前的外管的形状相同，而在弯曲部附近的一侧的槽的形状为半椭圆形的锥形。 由此，使外管的截面形状变为大致椭圆形状，其中待弯曲部分的外侧是锥形的。 当弯曲完成时，横截面形状基本上是圆形的。