公开(公告)号：US06467510B2

公开(公告)日：2002-10-22

申请号：US09998825

申请日：2001-12-03

申请人： Michio Yamashita ,  Hideo Abe ,  Yoshiharu Daikuzono ,  Singo Emi ,  Nobuo Tomizawa

发明人： Michio Yamashita ,  Hideo Abe ,  Yoshiharu Daikuzono ,  Singo Emi ,  Nobuo Tomizawa

IPC分类号： F16L900

CPC分类号： B21C37/08 ,  B21C37/0811 ,  B21C37/0815 ,  B21D5/14 ,  Y10T29/49826

摘要： In a pipe forming process using bending rolls, load applied to an upper roll is reduced to suppress the deflection of the upper roll, thereby suppressing creation of large end gap at the longitudinal center of the pipe, thus enabling production of high-strength, thick-walled elongated pipes. This is achieved either by (1) setting the roll spacing L between lower rolls to a value greater than the sum of the diameter Dwu of the upper roll 34 and the diameter Dwl of each of the lower rolls 32, and setting the amount S of tightening of the upper roll 34 with respect to the lower rolls 32 to a value greater than the radius Rwl of each of the plural rolls; or by (2) effecting pipe forming work on the sheet material such that the spacing L of the lower rolls 32 satisfies the following condition: (Dp+Dwl)>L≧0.85(Dp+Dwl), where Dp represents the outside diameter of the product pipe and Dwl represents the diameter of one of the plural rolls; or by (3) preparing the sheet material having leading and trailing bent end regions bent beforehand over a length not smaller than ⅕ of the entire circumference of the pipe to be produced; and effecting bending by the bending rolls such that the length of the regions bent by the bending rolls is less than ⅗ the entire circumference of the pipe.

摘要翻译： 在使用弯辊的管形成工序中，施加在上辊上的负荷减小以抑制上辊的挠曲，从而抑制管的纵向中心产生大的端部间隙，从而能够生产高强度， 壁式细长管。 这通过以下方式实现：（1）将下辊之间的辊间距L设定为大于上辊34的直径Dwu与下辊32的直径Dwl之和的值，并将 将上辊34相对于下辊32紧固到大于多个辊中的每一个的半径Rwl的值; 或者通过（2）对片材进行管形成工作，使得下辊32的间隔L满足以下条件：（Dp + Dwl）> L> = 0.85（Dp + Dwl），其中Dp表示外径 的产品管和Dwl表示多个辊之一的直径; 或者（3）制备具有预弯曲的前后弯曲端部区域的片材，其长度不得小于要制造的管的整个圆周的长度; 并且通过弯曲辊进行弯曲，使得弯曲辊弯曲的区域的长度小于管道整个圆周的长度。