Method of manufacturing a heat transfer small size tube

Details Method of manufacturing a heat transfer small size tube Method of manufacturing a heat transfer small size tube

1995-02-21

1996-09-17

Cuda, Irene

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

2989005, 2989003, B23P 1526

Patent

active

055556221

ABSTRACT:
A method of manufacturing a heat-transfer small size tube includes inserting a grooved plug in a metal tube having an outer diameter of 4.5 mm or more, performing a rotary or drawing process with respect to the outer surface of the metal tube while pulling the metal tube in the tube-axis direction, thereby continuously forming grooves, in the inner surface of the metal tube, in a spiral shape or in the tube-axis direction, each of the grooves having a ridge bottom width/bottom wall thickness ratio W.sub.2 /t defined as 0.2 to 1.5, a groove depth H defined as 0.15 to 0.30 mm, and a groove bottom width W.sub.1 defined as 0.15 to 0.50, and subjecting to diameter reduction process with a diameter reduction rate of 20 to 40% by performing at least one draw without plug process with respect to the metal tube to obtain a heat-transfer small size tube having a groove depth H defined by 0.15<H<0.25 mm.

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