What is a Serrated Extruded Finned Tube?
A serrated extruded finned tube is a high-efficiency heat exchange element that has serrated fins formed on the surface of a base tube through an extrusion process. Its production process mainly includes key steps such as material preparation, extrusion molding, and post-processing.
Material Preparation
When producing serrated extruded finned tubes, metal materials with good thermal conductivity and mechanical strength are typically selected, such as aluminum alloys, copper alloys, or stainless steel. The base tube is generally a seamless or welded steel tube, requiring pretreatment such as rust removal and degreasing to ensure surface cleanliness for a tight bond with the fin material.
The fin material is mostly aluminum strip or steel strip, requiring surface cleaning (degreasing, descaling) and straightening to ensure dimensional accuracy.
Serrated Design: The fin spacing, height, and serration angle are customized according to heat exchange requirements. The die needs to be precisely machined to form the serrated structure.
Extrusion Molding
Composite Tube Assembly: An aluminum tube is fitted over a base tube, and the aluminum tube is deformed using rolling and extrusion equipment to tightly adhere to the surface of the base tube, forming a preliminary fin structure.
Serrated Edge Processing: During extrusion, the fins are cut or punched using specialized tools to create serrated edges, increasing airflow turbulence.
Extrusion molding is the core step of the entire process. The pre-treated base tube is fed into an extrusion die, and the fin material (such as the aluminum tube) is plastically deformed along the outer surface of the base tube by the extrusion action of the die, forming uniformly distributed serrated fins.
During the extrusion process, parameters such as temperature, pressure, and speed must be precisely controlled to ensure a tight bond between the fins and the base tube, reducing contact thermal resistance.
Post-processing of Serrated Extruded Finned Tubes
After extrusion, the finned tubes need to undergo cooling, straightening, and surface treatment. The cooling process must be slow to avoid internal stress; straightening ensures straightness; surface treatment (such as galvanizing or powder coating) can improve corrosion resistance and extend service life. Applications of Serrated Extruded Finned Tubes
Finned tubes produced by extrusion technology have advantages such as good structural integrity, high heat exchange efficiency, and wide applicability, and are widely used in textile equipment drying, power, petrochemical, and refrigeration fields. Their serrated structure effectively reduces dust accumulation and enhances heat exchange efficiency.
