Electric heating – Metal heating – By arc
Patent
1992-01-24
1993-08-24
Albritton, C. L.
Electric heating
Metal heating
By arc
36447408, B23K 2608
Patent
active
052391590
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a nozzle movement system for a laser machining equipment, by which the nozzle of a CNC laser machining equipment for carrying out a three-dimensional machining is moved with respect to a machining surface, and more specifically, to a nozzle movement surface for a laser machining equipment by which a nozzle can be easily moved along the plane surface of a workpiece.
2. Background Art
A NCN laser machining equipment composed of a combination of a laser oscillator and a numerical control apparatus (CNC) is widely used. In particular, a machining of a complex configuration can be carried out at a high speed by a non-contact system, due to a combination of the characteristics of the laser machining equipment by which a machining can be carried out at a high speed and the characteristics of the numerical control apparatus (CNC) by which a complex contour can be controlled. Particularly, a CNC laser machining equipment capable of carrying out a three-dimensional machining which cannot be carried out by a conventional punch press, nibbling machine and the like is put to practical use.
To carry out a three-dimensional machining by the CNC laser machining equipment, the attitude of the nozzle at an extreme end must be controlled, in addition to a control of X-, Y- and Z-axes, and the control axes used for this purpose are referred to as an .alpha.-axis and .beta.-axis. The attitude of the nozzle is controlled by a zero offset type control or an offset type control.
In this three-dimensional laser machining equipment, a machining program is created by moving a nozzle on the surfaces of an actual workpiece and teaching machining points. At this time, the attitude of the nozzle is controlled so that the nozzle is perpendicular to a machining surface of the workpiece, and a predetermined distance is maintained between the nozzle and the machining surface. This is carried out to ensure that a laser beam is focused on a given position on the plane surface of the workpiece.
To achieve the above object, when the machining points are taught, the nozzle must be moved in the same direction as that in which the surface of the workpiece is machined, while maintaining the predetermined distance between the machining surface and the nozzle. Further, when the distance between the nozzle and the workpiece is adjusted, the nozzle must be moved perpendicularly with respect to the machining surface.
Nevertheless, if the plane surface of the workpiece to be subjected to a three-dimensional machining is not parallel to the X-Y plane, the attitude of the nozzle does not coincide with the axis of a basic coordinate, i.e., the nozzle is inclined. Therefore, it is very difficult to control the movement of the nozzle by using a usual operation panel by which movements in the X-, Y- and Z-axis directions are carried out in a basic coordinate system while maintaining a predetermined distance between the nozzle and the machining surface of the workpiece. Further, it is very difficult to adjust the distance between the nozzle and the machining surface by using the usual operation panel.
DISCLOSURE OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a nozzle movement system for a laser machining equipment, by which a nozzle can be moved while maintaining a predetermined distance between the nozzle and the machining surface of a workpiece.
To attain the above object, according to the present invention, there is provided a nozzle movement system for a laser machining equipment, for moving the nozzle of a CNC laser machining equipment when carrying out a three-dimensional machining of a machining surface, the system comprising a movement-command means for outputting a movement command on a hand coordinate system composed of the axial direction of the nozzle and the plane perpendicular to the nozzle, by manually feeding the nozzle on the hand coordinate system, a matrix creation means for creating a matrix for converting the movement
REFERENCES:
patent: 5067086 (1991-11-01), Yamazaki et al.
Albritton C. L.
Fanuc Ltd.
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