Electric heating – Metal heating – Cutting or disintegrating
Patent
1990-03-28
1992-05-12
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23H 706, B23H 718, B23H 720
Patent
active
051130513
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method in which, when a wire electrode is broken during machining, the wire electrode is connected and returned to the position where the breakage of the wire electrode has occurred.
BACKGROUND ART
A wire cut electric discharge of this type is as shown in FIG. 1. In FIG. 1, reference numeral 1 designates a workpiece to be machined; 2, a movable table on which a workpiece is mounted; 3, a wire cut electric discharge machine body which operates to move the movable table 2 to machine the workpiece 1 with a wire electrode 4 and a machining solution; 5, a machining solution supplying unit for supplying a machining solution to the workpiece 1; 6, a numerical control unit for controlling the positions of the movable parts of the machine to perform a machining control operation and an automatic wire electrode returning operation; 7, an automatic wire electrode supplying unit for automatically connecting or cutting the wire electrode 4; and 8, a machining electric power unit for supplying electric power to cause electric discharge between the wire electrode 4 and the workpiece 1.
FIG. 2 is an explanatory diagram for a description of an automatic wire electrode returning operation which is carried out when the wire electrode is broken. In this case, the wire electrode is broken when it is on a path (e) after moving along paths (a), (b), (c) and (d). In FIG. 2, reference character (f) designates a wire electrode returning path which is extended from the point B where the wire electrode has been broken to the start point A.
FIG. 3 is a block diagram showing the internal control operation of the numerical control unit. In FIG. 3, reference numeral 9 designates an NC (numerical control) program for operating the machine body 3; 10, a program analyzing section for analyzing the NC program; 11, a machining solution controlling section for controlling the machining solution supplying unit 5 to supply the machining solution to the workpiece 1 and the wire electrode 4; 12, a wire electrode controlling section for turning on and off a wire electrode supplying operation, and for transmitting a wire electrode break signal and a contact signal representing the contact between the workpiece 1 and the wire electrode to a control section 13 (described later); 14, an automatic supply controlling section for controlling the automatic wire electrode supplying unit 7 to connect or cut the wire electrode 4; and 15, a machining input/output section for transmitting signals to and receiving signals from the machining solution controlling section 11, the wire electrode controlling section 12, and the automatic supply controlling section 14, to transmit the wire electrode break signal and the contact signal to the control section 13.
According to the output signal of the program analyzing section 10, the control section 13 applies a signal to a servo motor 16 to control the position of the movable table 2, and applies a signal to the machine input/output section 15 to perform the machining solution control, the wire electrode control, and the machining control. In addition, when the wire electrode is broken, the control section 13 performs all the control for automatically returning the wire electrode. Further in FIG. 3, reference numeral 17 designates a display controlling section for displaying data such as coordinates on a CRT (cathode ray tube) 18.
FIG. 4 is a flow chart for a description of the automatic wire electrode returning operation. In FIG. 4, reference numeral 19 designates a step of retuning the wire electrode to the initial hole A; 20, a step of causing the automatic wire electrode supplying unit 7 to connect the wire electrode 4; 21, a step of determining whether or not the wire electrode has been returned to the wire electrode break point B; 22, a step of setting a speed to return the wire electrode to the wire electrode break point B; 23, a step of returning the wire electrode along the locus to the wire electrode break point B 24, a step of starting the machining operation a
REFERENCES:
patent: 4686343 (1987-08-01), Inoue
patent: 4940871 (1990-07-01), Watanabe
Evans Geoffrey S.
Mitsubishi Denki K.K.
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