Method of cutting workpieces having low thermal conductivity

Details Method of cutting workpieces having low thermal conductivity Method of cutting workpieces having low thermal conductivity

1990-10-15

1992-05-12

Yost, Frank T.

Severing by tearing or breaking

Methods

225 935, B26F 300

Patent

active

051119846

ABSTRACT:
A method of cutting and severing any portion of a nonferrous workpiece having a thickness generally equal to or less than 0.90 inches and a thermal conductivity significantly less than metal. A focused jet of CO.sub.2 crystallites (density of 0.03-0.4 g/cm.sup.3) and a gas, pressurized to at least 100 psi, is translated across the workpiece at a velocity of 250-1000 mm/sec, the jet having a converging focus (0.1-0.5 in.sup.2) substantially near the surface of said workpiece (i) to thermally embrittle the workpiece immediately surrounding said focus, and (ii) to fracture the workpiece at said focus by air pressure.

REFERENCES:
patent: 3676963 (1972-07-01), Rice et al.
patent: 3878978 (1975-04-01), Martinek
patent: 4389820 (1983-06-01), Fong et al.
patent: 4415107 (1983-11-01), Palmieri
patent: 4696421 (1987-09-01), Durr
patent: 4806171 (1989-02-01), Whitlock et al.

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