Roll formed finned tube is an efficient heat exchange element manufactured through cold plastic processing. Its core lies in using rollers to roll the tube, forming a specific fin structure on the surface, thereby significantly increasing the heat exchange area and improving heat transfer efficiency. This technology is widely used in heat exchange equipment in refrigeration, air conditioning, chemical and other fields, featuring both high performance and reliability.

 

The manufacturing process includes several precise steps. First, the base material (such as copper tube or steel-aluminum composite tube) undergoes preprocessing, including rolling for tube preparation, acid pickling for oil removal, and lubricant coating. Subsequently, a mandrel with a threaded profile is inserted into the tube, and through the coordinated application of rolling force by the mandrel and multiple circumferentially distributed rollers, the tube wall metal undergoes plastic deformation and fills the cavity. Finally, the finished product is obtained through drawing for shaping and trimming burrs and other processes. This cold working process has high efficiency and high material utilization rate, with the formed fins having a smooth surface and low residual stress, while also improving the mechanical properties and corrosion resistance of the tube.

 

In terms of material application, roll forming technology is applicable to both copper tubes (such as inner grooved copper tubes) and steel-aluminum composite tubes. For steel-aluminum composite finned tubes, it is necessary to first achieve the composite of steel tube and aluminum layer through explosive welding or hydraulic expansion to ensure interface bonding strength and heat conduction efficiency, and then roll the aluminum layer to form fins. This structure combines the pressure resistance of steel and the high thermal conductivity of aluminum, enabling the product to have both structural stability and excellent heat transfer performance in heat exchange equipment.

 

Process control and quality requirements are extremely strict. It is necessary to precisely control the rolling pressure, speed and roller pattern design to avoid fin cracking, deformation or burrs. The finished product undergoes surface treatment such as acid pickling and passivation to remove oil stains and oxide layers, and eddy current testing is used to detect the bonding quality of the composite interface. At the same time, the fin geometry and pressure resistance are strictly measured to ensure the product meets engineering requirements.
 

In conclusion, roll formed finned tubes significantly improve the performance of heat exchange elements through efficient cold plastic processing and material composite technology, making them an indispensable key component in modern industry.