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Shijiazhuang Faith Machinery Co., Ltd. operates as a manufacturer in the industrial machinery sector, focusing on the engineering and production of carbon steel tube mills. The design and construction of these mills involve a detailed understanding of material properties, mechanical engineering, and production workflows.
A carbon steel tube mill is a coordinated production line that transforms flat carbon steel strip into finished round, square, or rectangular tubing. The process begins with material preparation. An uncoiler holds the master coil, and a precision levelling machine ensures the strip is flat and free of twists or camber before it enters the forming section. This initial step is critical, as any irregularities in the strip can lead to defects in the final tube profile.
The forming section is comprised of a sequential set of roll stands. Each stand features a pair of contoured rolls that incrementally bend the strip edges upward until a cylindrical shape with an open seam is achieved. The number of forming stands and the precise geometry of each roll are calculated based on the tube's diameter, wall thickness, and the specific grade of carbon steel being processed. This careful engineering minimizes stress on the material.
The welding station is where the open seam is fused. For carbon steel, high-frequency (HF) electric resistance welding is a common method. The mill employs a solid-state welder that uses high-frequency current to heat the edges of the strip to a forging temperature. Squeeze rolls then apply pressure to consolidate the metal, creating a solid-state weld. Following welding, the internal and external weld bead is typically removed to create a smooth surface.
Subsequent stages include cooling and sizing. The sizing section uses another series of roll stands to calibrate the tube to its final dimensional tolerances and improve its roundness. Finally, a traveling cut-off saw slices the continuous tube into specified lengths. Shijiazhuang Faith Machinery integrates programmable logic controllers (PLC) to manage the synchronization of these components, allowing for consistent production and simplified operational control.
