Severing by tearing or breaking – Methods – With preliminary weakening
Patent
1979-08-02
1981-02-03
Yost, Frank T.
Severing by tearing or breaking
Methods
With preliminary weakening
219121LN, 225 96, 225 965, B26F 300
Patent
active
042483697
ABSTRACT:
Polycrystalline alumina tubing is scribed by means of laser pulses which are reiteratively focused on the same spots at spaced time intervals. By drilling small holes, the laser need be on for a very short period of time only, and only the surface layers are vaporized, thereby minimizing heat shock. The holes are deepened by repeating the series of pulses and directing them sequentially into the same holes. For tubing, an encoder is used which senses the angular position of the tubing as it is rotated and causes the laser to deliver pulses at the same angles at every revolution. When the holes have been sufficiently deepened, the tubing is snapped and breaks clean in the plane of the holes.
REFERENCES:
patent: 2879439 (1959-03-01), Townes
patent: 3026210 (1962-03-01), Coble
patent: 3157328 (1964-11-01), Hennings et al.
patent: 4044936 (1977-08-01), Obersby et al.
patent: 4169976 (1979-10-01), Cirri
General Electric Company
Kempton Lawrence R.
Legree Ernest W.
Schlamp Philip L.
Yost Frank T.
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