Tube Expanders are rolling tube type expansion tools used in the manufacturing of heat exchangers such as boilers and condensers for fixing and moulding tubes to tube sheets.
The roller applies rolling pressure to the inside of the tube expander to facilitate plastic deformation. It has a tapered shape and is designed to ensure that the interiors of expanded tubes always take on a spherical shape.
Furthermore, the roller tip has a smooth R-shape chamfer. This helps to avoid intense stress after tube expansion as well as the formation of sharp edges on the inside of the tubes.
The frame keeps the rollers in place at regular intervals and prevents them from falling. It also gives the groove into which the roller is inserted a feed angle. As a result, a configuration in which the mandrel is rotated clockwise is achieved.
A screw-feed-like self-propulsion mechanism is created, resulting in automatic tube expansion. Parallel tube expansion is primarily used in the expansion of tubes in heat exchangers, steam condensers, boilers, and other similar devices.
What is the role of a tube expander?
A tube expander for this type of work includes the MB-type, CB-type, and HB-type. The majority of tube expanders come in a set of two or more sizes. In most cases, the sizes range from small to large, with the small size fitting small copper tubing and the large size working with exhaust pipe.
The advantages of using a tube expander with a small copper tube are mostly found in plumbing applications. Long, straight lengths of tubing can be used for plumbing and then sized with a tube expander to fit snugly around another piece before soldering it tight.
There are no fittings or couplings required, and the joints are tight. When using an expander on a large or thick piece of tubing, it is frequently necessary to heat the tube to help it expand.
When the tube is heated, it becomes more pliable, and the expander does not have to work as hard to expand it. When deciding to use heat, it is critical to remove the expander from the tube first.
Heat applied to the expander while it is inside the pipe can cause it to seize and break. Spray the inside of the tube with a lubricant, such as an all-purpose oil, to help the tube expander slide inside the tube as it opens.
Why should I look for a boiler tube expander?
If you are looking for a boiler tube expander, purchase it from top brand companies where the price is also within budget. Tube joints are created by compressing the tube into a fixed container (i.e. tube sheet).
The ideal rolled joint is formed when the tube state changes to plastic (stays where it stops) and is contained by the elastic properties of the tube sheet (fully recovers). This must happen just before the tube sheet becomes plastic.
Before we conclude-
Under-rolling occurs when the tube is not compressed sufficiently and remains elastic. A bond is not formed because the yield of the material is not compressed sufficiently to convert the tube sheet to elastic.
Over-rolling happens when the tube exceeds the elastic property of the tube sheet, causing the ligaments between the tube sheet holes to shift and adjacent tubes to leak.
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