公开(公告)号：US20030019533A1

公开(公告)日：2003-01-30

申请号：US09933475

申请日：2001-07-27

申请人： Manoir Industries, Inc.

发明人： Joel Demarest ,  Gilles Verdier

IPC分类号： F16L011/00

CPC分类号： B23D37/04 ,  B22D13/02 ,  B23D39/00 ,  B23D43/02 ,  B23D43/04 ,  B23P15/00 ,  F28D2021/0059 ,  F28F1/40 ,  Y10T83/0304 ,  Y10T83/0311 ,  Y10T83/0524 ,  Y10T83/0596 ,  Y10T83/384 ,  Y10T407/1628 ,  Y10T407/1671 ,  Y10T409/400175 ,  Y10T409/40105 ,  Y10T409/40175 ,  Y10T409/4028 ,  Y10T409/402975 ,  Y10T409/40315 ,  Y10T409/404375 ,  Y10T409/4063 ,  Y10T409/4077 ,  Y10T409/503116 ,  Y10T428/12

摘要： An improved centrifugally-cast tube is provided, along with a related method and apparatus of making the tube. The tube includes a plurality of grooves and bosses that are mechanically machined into an interior surface of the tube, such as by a broaching process. The profile of grooves and bosses may be defined by a plurality of intersecting concave and convex radii. The tube is resistant to creep, carburization and metal dusting. The tube also has an enhanced heat transfer rate, and a desirable surface roughness. A method of making the tube is also provided. The method essentially consists of mechanically deforming the interior surface of the tube by passing a series of cutting inserts on support rings having incrementally-differing dimensions over the interior surface. An apparatus is also provided which includes a telescoping shaft upon which is mounted at least one cutting tool that has a plurality of cutting inserts and is adapted to form a plurality of grooves and bosses in the interior surface of the tube. The grooves and bosses may be straight or spiraled.