| 摘要 |
PCT No. PCT/JP94/00516 Sec. 371 Date Nov. 16, 1994 Sec. 102(e) Date Nov. 16, 1994 PCT Filed Mar. 29, 1994 PCT Pub. No. WO94/23887 PCT Pub. Date Oct. 27, 1994A laser beam machine which makes it possible to diagonally cut a workpiece by the use of a laser beam. The laser beam (1) is condensed by a condensing lens (1a) and irradiated diagonally to a workpiece (5). An assist gas nozzle (3) is held perpendicularly to the workpiece (5), and an assist gas (3b) introduced via an assist gas-introducing port (3a) is jetted via an open end of the assist gas nozzle (3) against the cutting point (5a) on the workpiece (5) from above. By perpendicularly blowing the assist gas (3b) against the workpiece, sufficient pressure of the assist gas is applied to the cutting point (5a), whereby when a groove (5b) is formed through shifting of the cutting point (5a) as the diagonal cutting proceeds, the assist gas (3b) is constantly supplied through the groove (5b) to the optimum degree. At each cutting point (5a) , the laser beam (1) diagonally irradiated and the assist gas (3b) perpendicularly blown cause thermal and chemical reactions of a metal to melt same, while molten metal is immediately removed by the assist gas (3b). As a result, the diagonal cutting of the workpiece proceeds smoothly.
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