Roll pass desigh of welded steel pipe

Hole is made by the tank formed by a pair (or more) rolls rolling. Steel strip deformation to a certain shape (rolled) through the hole, and through a series of successive deformation molded into a cylindrical tube. For the series of grooved shape and size selection, calculation and determination, and finally drawn into roll chart, the whole process is called the roll pass design. The basic requirements for roll pass design of welded steel pipe (LSAW and SSAW steel pipe)are:
(1) with a minimum passes (i.e., the shortest length of the deformation zone) to complete the forming and deformation process;
(2) the generated edge extending as small as possible when molding without creating ridges and folds;
(3) the edges are fully deformed and tube joints for no beak-shaped;
(4) stable strip forming in the hole;
(5) uniform deformation, roll small and uniform wear;
(6) low energy consumption;
(7) ensure the pipe dimensions and surface quality meet standard requirements;
(8) roll processing convenient, easy to manufacture, pass design can be combined with added processing;
(9) the pass design is with the characteristic of standardization, which can fit the unit with the same type of product specifications;
(10) can make use of computer-aided design (CAD).