The working principle of the stainless steel pipe forming machine

The working principle of the stainless Steel Tube Forming Machine mainly relies on metal plastic deformation and welding technology. Its core process can be divided into the following key steps:
1. Forming stage
Rolling and extrusion forming
The stainless steel strip is bent into a tubular shape through continuous extrusion by multiple sets of rolls. The roll spacing can be adjusted to accommodate different pipe diameter specifications (such as round pipes, square pipes). The three-roll tube forming machine uses a helical rolling process, with the rolls and the tube billet moving in a spiral motion to achieve uniform deformation.
High-frequency/Laser welding
The formed tube is welded using high-frequency current (100-150kHz) or laser technology at the weld seam. The skin effect is utilized to rapidly heat the contact surface to the melting point, forming a high-strength weld seam. The welding system can precisely control parameters such as current and frequency to adapt to different wall thickness tubes.
2. Diameter control and finishing
Grinding and polishing
The welded tube is corrected for roundness by a sizing die and the weld seam is removed using a grinding wheel or polishing wheel to ensure a smooth surface on the inside and outside. Some equipment is equipped with an online detection system to monitor size tolerances in real time.
Cold rolling strengthening (optional)
For products with high precision requirements, cold rolling is used to further reduce the wall thickness and improve surface quality. Precise deformation is achieved through the periodic changes in the gap between the mandrel and the rolls.
3. Auxiliary systems
Automation control
The PLC system integrates temperature and pressure sensors to dynamically adjust the rolling speed and tension, ensuring the stability of the forming process.
Pickling treatment (special requirements)
Some processes require the use of a nitric acid-hydrofluoric acid mixture to remove the oxide scale, but this step can be omitted in the conventional processing of stainless steel tubes due to the material's corrosion resistance.