Electric heating – Metal heating – By arc
Patent
1994-09-12
1995-07-11
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912184, B23K 2614
Patent
active
054323169
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improvement of a laser beam machining control apparatus equipped with a contaminant repellent member, such as a rotary impeller, for preventing contaminants produced during laser beam machining from adhering to optical components and the like of a laser beam machine, and to a laser beam machining control method using the apparatus.
BACKGROUND ART
Already known are laser beam machines, in which an impeller rotatable at high speed is arranged between an optical component forming a light path and a workpiece to be machined, to prevent contaminants such as sputters, oil mist, etc. produced during machining from adhering to optical components of the laser beam machine.
A principal part of a conventional laser beam machine of this type provided with an impeller rotatable at high speed is schematically shown in the sectional side elevation of FIG. 7. In the figure, a laser beam emitted from a laser oscillator is reflected at a mirror 2 in a machining head 1 toward a parabolic mirror 3 and then focused by the parabolic mirror 3 to irradiate a workpiece 4 to be machined. Also, an assist gas is introduced into the machining head 1 from supply means, not shown, through a pipe 5, and then supplied to the workpiece 4 after being throttled by a nozzle 6 mounted to a distal end of the machining head 1, thereby melting the workpiece 4 for machining by the interaction of the laser beam and the assist gas.
An impeller is arranged between the parabolic mirror 3, which is the endmost optical component for the laser beam emission, and the workpiece 4. The impeller 7 comprises a rotary shaft 9 to be rotated at high speed by a motor M as rotating means, and a plurality of vanes 10 attached radially to the rotary shaft 9, and repels contaminants 8 scattering from the surface of the workpiece 4, thereby preventing the contaminants 8 from adhering to the parabolic mirror 3. That is, the impeller 7 functions as a contaminant repellent member.
The impeller 7 is rotated by the motor M at such a high speed that the contaminants 8 scattering from the surface of the workpiece 4 during machining are struck by at least one vane 10 without fail while they pass through the rotating vanes 10 from below. The scattering contaminants 8 are thus surely repelled by the vanes 10, whereby the contaminants 8 are prevented from reaching the parabolic mirror 3.
In the conventional laser beam machine, however, rotation of the impeller 7 is controlled by means of general-purpose commands which are independent commands designed for ON/OFF control of external equipment; therefore, rotation of the impeller 7 cannot be controlled unless such commands are specified in a machining program.
The following is an example of a machining program for a conventional laser beam machine equipped with the impeller 7:
______________________________________ Line No. Statement
______________________________________
1. L P[1] 100 mm/sec FINE
2. DO[1] = ON
3. LASER START
4. L P[2] 100 mm/sec CONT 100
5. L P[3] 100 mm/sec FINE
6. LASER END
7. DO[1] = OFF
8. [END]
______________________________________
In the above program, the statements of Line No. 1, 4 and 5 are declarations for commanding movements to target positions P[1], P[2] and P[3] which have respectively been defined in advance in the machining program, moving speeds, interpolation types and the like. The statement of Line No. 3 is a declaration for commanding a pre-flow (preliminary emission of the assist gas) and the start of emission of the laser beam. The statement of Line No. 6 is a declaration for commanding the end of emission of the laser beam and an after-flow (continued emission of the assist gas for a predetermined time), and the statement of Line No. 8 is a declaration for commanding the end of the program. The statements of Line No. 2 and 7 are independent general-purpose commands used for ON/OFF control of external equipment; in the above example, the commands are used for ON/OFF control of the motor M which controls the rot
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Ito Takayuki
Takahashi Hiromitsu
Evans Geoffrey S.
Fanuc Ltd.
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