永利3044官网

   What exactly causes concave folds to occur? There are several possibilities: first, the diameter reduction during the cold drawing process is too large or the steel pipe hammer head transitions too quickly; second, the thickness of the pipe wall is uneven and partially too thin; the thirty-year honing equipment is too old and cannot meet the processing requirements of the pipe.
   After these numerous improvements, similar bad flaws should be able to be improved.