Electric heating – Metal heating – By arc
Patent
1995-02-07
1999-04-13
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
36447408, B23K 2600
Patent
active
058939873
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a laser output control system for controlling a laser output in response to a command signal from a CNC.
2. Description of the Related Art
In drilling a hole using a CNC laser beam machine, a CNC transfers in advance waveform data, a repetition frequency and the number of times of output (hereinafter collectively referred to as "output data") necessary for executing hole drilling to an output control circuit (waveform control circuit), and then directs beam-on.
Therefore, when it is required to continuously carry out hole drilling under a plurality of machining conditions, the CNC repeatedly transfers the output data and directs beam-on, the same number of times as the number of the plurality of machining conditions in the manner described above.
By the way, in drilling one hole, it is required to carry out three consecutive steps of preliminary machining, main machining, and cleaning machining while changing machining conditions.
In such machining, the CNC transfers output data for preliminary machining and directs beam-on, then transfers output data for main machining and directs beam-on, and finally transfers output data for cleaning machining and directs beam-on. Thus, the transfer of data is carried out for each step of the machining, requiring, in the above example, as many as three times of data transfer in drilling a single hole. Therefore, in total, there is a waste of time amounting to the number of holes x three transfer time periods.
Summary of the Invention
The present invention has been made in view of the aforesaid problems, and an object thereof is to provide a laser output control system which is capable of sharply reducing a time period required in transfer of waveform data from a CNC during laser-beam machining.
To solve the above problems, the present invention provides a laser output control system responsive to a command signal from a CNC (Computer Numerical Controller), for executing control of laser output, comprising waveform data-storing control means for storing various sets of waveform data into a first memory region, registration data-storing control means for storing registration data including a specification for one of the sets of waveform data, into a second memory region, and output control means responsive to a command from the CNC, for reading the registration data within the second memory region, generating an output waveform, and delivering the output waveform to a power supply for a laser oscillator.
The waveform data-storing control means stores various waveform data transferred from the CNC into the first memory region. The registration data-storing control means stores the registration data transferred from the CNC into the second memory region. The output control means reads the registration data in response to a command from the CNC. The registration data include a specification for a set of the waveform data stored in the first memory region, and the output control means forms an output waveform based on the specified set of waveform data, and transfers the resulting output waveform to the power supply for the laser oscillator, thereby controlling the laser output.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing the whole arrangement of a laser output control system according to the invention;
FIG. 2 is a diagram showing a set of waveform data;
FIG. 3 is a diagram showing a waveform data group input by program commands , which is displayed on a screen;
FIG. 4 is a diagram showing an arrangement of registration data stored in a register;
FIG. 5 is a diagram showing registration data displayed on a screen; and
FIG. 6(A), FIG. 6(B), and FIG. 6(C) are explanatory diagrams illustrating output waveform control, in which FIG. 6 (A), FIG. 6 (B), and FIG. 6 (C) show a first stage, a second stage, and a third stage thereof, respectively.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Next, an embodiment of the invention will be described with reference t
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patent: 5434383 (1995-07-01), Nakata et al.
patent: 5444211 (1995-08-01), Nakata et al.
patent: 5453594 (1995-09-01), Konecny
Iehisa Nobuaki
Suzuki Kazuhiro
Yamazaki Etsuo
Evans Geoffrey S.
Fanuc Ltd.
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