Electric heating – Metal heating – By arc
Patent
1989-03-21
1990-07-31
Albritton, C. L.
Electric heating
Metal heating
By arc
21912172, 21912164, 21912185, B23K 2600
Patent
active
049452070
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an assist gas control method for a CNC laser machining device including a combination of a laser beam machine and a numerical control apparatus (CNC), and more particularly, to an assist gas control method in which instructions for assist gas control are supplied by a machining program for carrying out machining.
DESCRIPTION OF THE RELATED ART
CNC laser machining devices comprising a combination of a laser beam machine and a numerical control apparatus (CNC) are now in practical use, and since the function of the numerical control apparatus (CNC), in particular, allows a workpiece having a complex shape to be machined at a high speed, the CNC laser machining devices are used not only for cutting metal but also for surface treatment of the metal, such as welding, alloying of a metal surface, amorphous treatment of a metal surface, and the like.
An assist gas is widely used in metal machining to prevent contamination of the lens of the laser machining device, protect the workpiece from machining splash, promote the machining of the metal, and the like.
In this operation, however, the kind, pressure, and flow time of the assist gas are selected, set, and adjusted by an operator in charge of the machining, according to working instructions or based on the operator's judgment. Therefore, problems arise in that a considerable time is required actually before starting laser machining and in that a defective machining may occur due to, for example, an error by the operator.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an assist gas control method which solves the above problems and in which instructions for an assist gas control are supplied by a machining program for carrying out the machining.
To solve the above problems, a first embodiment provides an assist gas control method for a CNC laser machining device including a combination of a laser beam machine and a numerical control apparatus (CNC), the step of:
controlling or indicating a kind, mixing ratio, pressure, and flow rate of an assist gas based on instructions from a machining program; and
automatically controlling the kind, mixing ratio, pressure, and flow rate of the assist gas by the numerical control apparatus, to effect laser machining.
A second embodiment provides an assist gas control method for a CNC laser machining device including a combination of a laser beam machine and a numerical control apparatus (CNC), comprising the steps of:
controlling or indicating a pressure and flow time of a pre-flow of an assist gas and a pressure and flow time of a post-flow of the assist gas based on instructions from a machining program; and
automatically controlling the pressure and flow time of the pre-flow before machining and the pressure and flow time of the post-flow after machining by the numerical control apparatus, to effect laser machining.
A third embodiment provides an assist gas control method for a CNC laser machining device including a combination of a laser beam machine and a numerical control apparatus (CNC), comprising the steps of:
controlling or indicating a kind, mixing ratio, pressure, and flow rate of an assist gas, a pressure and flow time of a pre-flow of the assist gas, and a pressure and flow time of a post-flow of the assist gas based on instructions from a machining program; and
automatically controlling the kind, mixing ratio, pressure and flow rate of the assist gas, the pressure and flow time of the pre-flow, and the pressure and flow time of the post-flow by the numerical control apparatus, to effect laser machining.
The kind, mixing ratio, pressure, and flow rate of the assist gas are controlled by instructions from the machining program, and thus the assist gas is controlled automatically, whereby the operator need not select, set or adjust the assist gas.
Furthermore, the pressure and flow time of the assist gas pre-flow before machining and the pressure and flow time of the assist gas post-flow after machining are controlled by
REFERENCES:
patent: 4319120 (1982-03-01), La Rocca
Albritton C. L.
Fanuc Ltd.
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