Electric heating – Metal heating – By arc
Patent
1991-12-02
1993-03-02
Albritton, C. L.
Electric heating
Metal heating
By arc
2191217, 340463, B23K 2602
Patent
active
051911884
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of preventing an interference by a machining head with a work holder in compound machining equipment designed to perform punch-pressing and laser machining.
BACKGROUND ART
A punching press is provided with an interference area for protecting a work holder, to thereby prevent an interference by a punching head with the work holder. The punching head is programmed to be properly positioned for machining a work, and the relative position of the work on a table with respect to the punching head is controlled by a computerized numerical control machine which moves the table to reach such a relative position. If the punching head attempts to enter the interference area, then punch-pressing is prevented, and an alarm is sounded.
Recently, however, the number of types of compound machining equipment which combine a punching press and a laser machining unit has increased, as such compound machining equipment combines the advantages of both a punching press and laser machining unit; one setup enables a free selection of punching, ribbing, forming or laser-cutting, and then punching, hollowing out or contour cutting a work to the desired shape. In such compound machining equipment, therefore, it is necessary to prevent interference between the punching head and the work holders during a punch-pressing process, or between a laser head and the work holders during a laser machining process.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a method of preventing an interference by a machining head with a work holder, in accordance with the conditions of a punch-pressing process or a laser machining process.
To attain the above object, a machining head interference preventive method is provided for preventing an interference between a punching head and work holders, or between a laser head and work holders in compound equipment designed to perform a punch-pressing and laser machining. In this method, a horizontal interference area wherein the punching head and the laser head would horizontally interfere with the work holder is established, and a vertical interference area wherein the laser head would vertically interfere with said work holder is also established, and accordingly, if the punching head attempts to enter the horizontal interference area, the system prevents the punch-pressing and sounds an alarm, or if the laser head descends into the vertical interference area, and further, enters the horizontal interference area, the system sounds an alarm.
In compound equipment, either a punch-pressing or laser machining is selected. If a punch-pressing is selected, then the system determines whether or not a punching head is attempting to enter a horizontal interference area wherein the punching head will interfere with a work holder. If the punching head is attempting to enter a horizontal interference area, then the system prevents the punch-pressing and sounds an alarm.
When a laser machining is selected, if the laser head descends into the vertical interference area wherein the laser head would vertically interfere with the work holder, then the position of the laser head is monitored, and if the laser head enters a horizontal interference area, an alarm is sounded.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a flowchart of the machining head interference preventive method according to the present invention;
FIG. 2(a) shows an outline of the horizontal positional relationship between the machining heads and the work holders of compound equipment;
FIG. 2(b) shows an outline of the vertical positional relationship between the machining heads and the work holders of the compound equipment; and
FIG. 3 is a block diagram of hardware of a computerized numerical control machine (CNC) for implementing the present invention.
BEST MODE OF CARRYING OUT OF THE INVENTION
An embodiment according to the present invention is described, with reference to the drawings.
FIG. 2(a) shows the outline of the horizontal positional relationshi
REFERENCES:
patent: 4109233 (1978-08-01), Erickson
patent: 4335296 (1982-06-01), Bredow
patent: 4427873 (1984-01-01), Orita et al.
patent: 4698480 (1987-10-01), Klingel
patent: 5021632 (1991-06-01), Hauert
patent: 5047752 (1991-09-01), Schorn
patent: 5067086 (1991-11-01), Yamazaki et al.
Albritton C. L.
Fanuc Ltd.
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