Method of cleaving a brittle material using a point heat source

Details Method of cleaving a brittle material using a point heat source Method of cleaving a brittle material using a point heat source

1997-10-29

2000-02-08

Rada, Rinaldi I.

Electric heating

Metal heating

By arc

21912172, 21912185, 225 1, 225 935, B23K 2600

Patent

active

060230398

ABSTRACT:
A method of cleaving a strip by tensile stress applied by a pulse laser point heat source by shifting a pulse-heating position of the pulse laser point heat source on the basis of both an optimum distance "D" of a center position of a pulse beam spot of the pulse laser point heat source irradiated on the strip from a tip of a crack of the strip and an optimum pulse time "t" of the pulse laser point heat source, wherein the optimum distance "D" is determined by the steps of: selecting "t" to find a value of 4.kappa.t/W.sup.2 where ".kappa." is a thermal diffusivity of the strip, "W" is a width defined as a distance between a cleaving-intended line and a side edge of the strip; and finding an optimum value of D/W from the value of 4.kappa.t/W.sup.2 with reference to a previously obtained relationship between the optimum value of D/W and the value of 4.kappa.t/W.sup.2 thereby to find the optimum distance "D". The optimum distance "D" is found so that if the value of 4.kappa.t/W.sup.2 is in the range of 0.0001-0.05, then the optimum value of D/W is 0.1, if the value of 4.kappa.t/W.sup.2 is in the range of 0.05-1.0, then the optimum value of D/W is 0.2, and if the value of 4.kappa.t/W.sup.2 is not less than 1.0, then the optimum value of D/W is 0.4.

REFERENCES:
patent: 3453097 (1969-07-01), Hafner
patent: 3629545 (1971-12-01), Graham
patent: 3790362 (1974-02-01), Dahlberg et al.
patent: 3935419 (1976-01-01), Lambert et al.
patent: 4615765 (1986-10-01), Levinson et al.
patent: 5084604 (1992-01-01), Dekker et al.
patent: 5138131 (1992-08-01), Nishikawa et al.
patent: 5154334 (1992-10-01), Dekker et al.
patent: 5254833 (1993-10-01), Okiyama
patent: 5585018 (1996-12-01), Kanaoka et al.
patent: 5609284 (1997-03-01), Kondratenko
patent: 5776220 (1998-07-01), Allaire et al.

Affiliated with

Also associated with

Rating

Method of cleaving a brittle material using a point heat source does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of cleaving a brittle material using a point heat source , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of cleaving a brittle material using a point heat source will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1682755