公开(公告)号：US4534199A

公开(公告)日：1985-08-13

申请号：US532070

申请日：1983-09-14

申请人： Kazuhide Takaishi ,  Toshiki Kadonaga ,  Masamitsu Tamura ,  Shigeharu Nakamura ,  Mitsuru Mizoguchi ,  Yoshinobu Hirota ,  Yukinobu Yamazaki

发明人： Kazuhide Takaishi ,  Toshiki Kadonaga ,  Masamitsu Tamura ,  Shigeharu Nakamura ,  Mitsuru Mizoguchi ,  Yoshinobu Hirota ,  Yukinobu Yamazaki

IPC分类号： B21D39/04 ,  B21C3/02 ,  B21C37/16 ,  B21C37/20 ,  B21C1/24 ,  B21C37/15

CPC分类号： B21C37/16

摘要： A method of producing a stepped tube, the method including the steps of preparing a straight mother tube with a stepped wall portion of a smaller inside diameter on the inner periphery thereof at a predetermined position in the longitudinal direction of the tube between opposite straight portions of a larger inside diameter; inserting the mother tube in a clearance a split die having a die cavity between bearing portions provided at opposite ends thereof and separable into first and second halves in the longitudinal direction at a median point of the die cavity and a plug member extensible through the die cavity; gripping a mouth portion of the mother tube by a carriage while positioning the plug member at one of the die bearing portions on the side of the carriage; moving the carriage in the longitudinal direction of the tube until the stepped wall portion on the inner periphery of the mother tube aligns with the die cavity, thereby expanding and stretching one of the straight portions; next moving the plug member up to the other die bearing portion to expand the inner stepped wall portion into and along the die cavity, forming a reversed stepped wall portion on the outer periphery of the mother tube; releasing the joined first and second halves of the split die to permit the first die half on the side of the carriage to move in the longitudinal direction of the tube; and moving the carriage again in the longitudinal direction of the tube to expand and stretch the other straight portion, thereby forming a tube with a circumferential stepped wall portion from a mother tube with an inner stepped wall portion.

摘要翻译： 一种制造阶梯式管的方法，该方法包括以下步骤：在管的纵向上的预定位置处，在其内周上准备具有较小内径的台阶壁部的直母管， 内径较大; 将母管插入间隙中，在具有设置在其相对端部的轴承部分之间具有模腔的分开模具中，并且在模腔的中点处可沿长度方向分离成第一半部和第二半部，以及通过模腔延伸的塞部件 ; 通过滑架抓住母管的口部，同时将插头构件定位在托架侧面的模具支承部分之一处; 沿着管的纵向方向移动托架，直到母管的内周上的台阶壁部分与模腔对准，从而使直线部分之一伸展和拉伸; 接着将插塞构件移动到另一个模具支承部分，以将内部阶梯壁部分扩展到模腔内并沿着模腔膨胀，在母管的外周上形成反向的台阶壁部分; 释放分离模具的连接的第一和第二半部以允许滑架侧面上的第一模具半部在管的纵向方向上移动; 并且沿着管的纵向方向再次移动托架以使另一直线部分伸展和拉伸，由此从具有内阶梯状壁部分的母管形成具有周向台阶壁部的管。