Heat exchanger tube sheet processing
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The connection between the heat exchange tube and the tube sheet is achieved through expansion joining; the thickness of the tube sheet is δ=60, and the diameter of the tube is φ89. What method is used to fabricate the holes in the tube sheet, and what diameter should those holes have? How to ensure surface roughness, and what are the specific steps for expansion joining? I’m a beginner, sorry
Marking → Drilling positioning holes → Boring → Reaming, all can be done on a Z80 drilling machine. Expansion joining requires an expansion tube machine and expanders; follow their instructions for the specific procedures.
Marking → Drilling positioning holes → Boring → Reaming; if the heat exchange tubes are only expanded and fitted to the tube sheet without being welded, very high requirements are imposed. The tube ends of the heat exchange tubes need to be annealed (using a lead bath); hydraulic expansion is the preferred method for expansion joining. Grooves must be machined in the holes of the tube sheet (using a specialized grooving tool). When ordering heat exchange tubes, it is necessary to emphasize the ellipticity and tolerances of the tube diameter.
Marking, drilling, reaming, counterboring, and grooving – the other steps are relatively easy to understand; the key lies in counterboring and grooving, as any mistakes will occur in these two aspects
What kind of heat exchanger is this? Using heat exchange tubes with such large diameters – must be a mistake. In production, before expanding the tubes, a small tube sheet with the same specifications as the actual tube sheet is used for testing; only after it passes the tests is the appropriate tube expansion process established before proceeding with the expansion