公开(公告)号：US06718813B2

公开(公告)日：2004-04-13

申请号：US10153937

申请日：2002-05-23

申请人： Tsutomu Yasuda ,  Masato Ishikawa ,  Yoshihisa Mikami

发明人： Tsutomu Yasuda ,  Masato Ishikawa ,  Yoshihisa Mikami

IPC分类号： B21D1702

CPC分类号： B21K1/767 ,  B21D17/02 ,  B21D53/28 ,  B21K1/768 ,  Y10T29/49474

摘要： In a pipe rack forming method, in a state of holding a pipe forming body by a holding portion in a holding metal mold, at a time of pressing a flat surface portion of the pipe forming body by tooth bottom forming surfaces of respective stages of tooth profile portions in a tooth profile metal mold, the structure is made such as to sequentially employ the tooth profile portions in which a tooth bottom height applied to the flat surface portion is reduced in sequence for the tooth profile portions in the tooth profile metal mold, repeatedly pressing and moving forward and backward mandrels having the same size to an inner periphery of the pipe forming body every time when the respective stages of tooth profile portions in the tooth profile metal mold press the flat surface portion, and forming a rack tooth having a final tooth profile.

摘要翻译： 在管架形成方法中，在通过保持金属模具中的保持部保持管形成体的状态下，在通过齿的各个齿的齿底形成表面按压管形成体的平坦表面部分的时刻 在齿形金属模具中的轮廓部分，该结构被制成为顺序地使用齿轮廓部分，其中施加到平坦表面部分的齿底高度对于齿形金属模具中的齿形部分依次减小， 每次当齿形金属模具中的齿形部分的各阶段按压平坦表面部分时，反复按压和移动具有相同尺寸的向前和向后的心轴到管形成体的内周，并且形成具有 最终齿廓。