Method and tool for removing tubes from multi-tube finned heat e

Details Method and tool for removing tubes from multi-tube finned heat e Method and tool for removing tubes from multi-tube finned heat e

1975-12-18

1977-08-23

Duzan, James R.

Metal working

Method of mechanical manufacture

Shaping mating parts for reassembly in different positions

291574, 408 1R, B23P 1902

Patent

active

040430189

ABSTRACT:
Damaged tubes are removed from a multi-tube finned coil of the type in which the tubes are expanded into the fins by cutting a helix in the tube wall for the length of the tube from internally of the tube and then pulling the tube out by collapsing the helix upon itself.
The tool for accomplishing this has a cutting end portion which has a succession of cutting teeth in a helical array in one rotative direction and with the tips of the cutting teeth successively along the length of the cutting end portion generally progressing radially outwardly from about the internal diameter of the tube to about the external diameter of the tube to be removed, the cutting portion also having a series of flutes extending helically along the length of the cutting end portion in the opposite direction from the helical array of the teeth, the tool being used to carry out the method of cutting a helix into the wall of the tube as the cutting end portion of the tool passes through the length of the tube.

REFERENCES:
patent: 2411246 (1946-11-01), Clapper
patent: 2918955 (1959-12-01), Simas
patent: 3058199 (1962-10-01), Cave et al.
patent: 3176384 (1965-04-01), Johnson

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