The sizing machine is a device used for continuously rolling into straight seam pipe blanks. Its working principle is to form different specifications of strip steel into corresponding straight seam pipe blanks through roller or row roller forming, and then use high-frequency induction (or contact) heating to weld the pipe blanks into straight seam steel pipes. The number of working frames of the sizing machine is relatively small, usually 5-14 frames, with a total reduction rate of about 3% -7%. Increasing the number of sizing frames can expand product specifications and bring convenience to production. There are many forms of sizing machines, which can be divided into two roll, three roll, and four roll types according to the number of rolls; According to the rolling method, it is divided into longitudinal rolling sizing machine and oblique rolling sizing machine. The service life of the bearings in the sizing machine is limited by the service life of the sizing roller box, and the service life of the bearings is closely related to the design, manufacturing, and installation of the sizing roller box. The main function of the sizing machine is to form different specifications of strip steel through roller or row roller forming, continuously roll it into corresponding straight seam pipe blanks, and use high-frequency induction (or contact) heating to weld the pipe blanks into straight seam steel pipes.
