Pipe crack method and crack machine

摘要

The invention relates to a method for manufacturing a tube in an outer wall (10, 10) of a tube.D '(11, 12, 13, 13a, 13b) has the step: ET1: guide the first printing hole ((50) (...) with preformed teeth on the tube wall until the protrusion (... 55, 56) is obtained,A complete cylinder core (58) is located in the tube, and then ET2: the second cylinder core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core core A punching core (78) is located in a tube and has a groove (79) adapted to accommodate the punching material.