The high-speed rolling processes offered by Chaluminium. com are tailored to meet the requirements of both low- and high-fin heating and cooling applications. The majority of finned tube components are utilized as heat exchanger tubes in various home appliances like refrigerators, air conditioners, and heaters.

The Process of Rolling Fin Tubes

- Throughfeed or plungefeed rolling with three dies and an internal mandrel is typically used to create fins on materials such as copper, aluminum, and steel

- During rolling, the internal mandrel will support the tube and can be profiled to generate fin-like forms on the internal surface of the tube

- These forms will increase the surface area of the tube as well as induce turbulence and mixing of the working fluids, which will result in improved heat transfer

- To generate continuous finned sections with blank spacing in between for baffle spacing or in places where subsequent tube bending operations are carried out, a combination of throughfeed and plungefeed rolling can be used

GEOMETRY OF THE FIN TUBE
Fin tube forms include a wall thickness under the fins in addition to a profile geometry that is described by straight side flanks with crest flat, root flat, and radius transitions at fixed pitch spacing. These transitions occur at regular intervals. Low flank angles of 10 degrees or less are typical of aluminium finned tubes profiles, and the number of fins per inch (FPI) and the height of the fins are typically used to characterize aluminium finned tubes profiles.

The range of FPI values for the low fin, medium fin, and high fin classifications is from 5 to 8 FPI to 50 to 60 FPI. Low fins are typically no longer than 1/8 inch (3 mm), medium fins are typically no longer than 14 inch (6 mm), and high fins can be as long as 1/2 inch (12 mm) or longer. There is also the possibility of a multi-start geometry for the fin tubes.

The fin geometry of virtually every manufacturer is, in some respect, one of a kind. The two most common types of rolled fin tubes are profiles with a diameter-over-fin that is the same as the pre-roll blank and a significantly reduced inside diameter, and profiles with a diameter-over-fin that is larger than the pre-roll blank and a reduction in inside diameter that is minimal to nonexistent. Both of these types of profiles have a significantly reduced inside diameter. The ASME Boiler and Pressure Vessel Codes, such as SB359, are generally the authorities that govern the specifications for fin tubes. The Chaluminium. com three cylindrical die rolling process can be used to roll the majority of fin profiles, but this process requires careful consideration of wall thickness, fin height, and fin spacing.

Chaluminium. com is the domain name. Important Prerequisites for the Rolling of Fin Tubes

Accuracy of the rolling machine's controls in addition to its stability and rigidity

Accuracy and precision of the discs (dies) that are used for fining

Adjustment of the spindle tilt angle with high levels of accuracy and precision

Maintaining the piece's stability all the way through the rolling process

Measurements of the diameter of the pre-roll blank and the wall thickness

Aspects pertaining to the quality of the pre-roll blank material

adequate cutting speed of the fining dies into the blank material

A sufficient amount of dwell time after the dies have attained their final penetration position.

A support mandrel of the appropriate size

Added Advantages

Root diameter that remains constant

Form of the profile and distance between the fins

The number of leads and the spacing between the fins

Quality and output that is consistent throughout

Obtain the ideal values for the major diameter of the fins and the wall thickness under the fins.

Try to steer clear of cracks and other visual defects.

Produce a radial outward protrusion of the fins.

Roundness of the form must be calibrated.

Check the wall thickness as well as the height of the rolled fins.

FEATURES THAT ALLOW FOR ADVANCED FIN TUBE ROLLING CONTROL

The structure of the Chaluminium. com 3-Die machine.

A True Die Position system that can be driven by either an electric or a hydraulic servo.

Independent adjustment of the axial position of the fin disc, with a readout displayed on the screen.

Independent adjustment of the tilt angle of the fin disc, with a readout displayed on the screen.

KINEFORM rolling disc dies for aluminium finned tubes rolling.

KineMat provides both automatic and manual tube handling units for input and output.