JPS60108223A - Wire electric-discharge machining device - Google Patents

Abstract

PURPOSE:To continue at the work of smooth electro-discharge cutting, by feeding a gap between a wire electrode and a work with a machining solution being more decreased in quantity than that in time of electro-discharge machining when the wire electrode snapped in the midway of machining is reset up to the disconnection position after being repaired at a machining start position. CONSTITUTION:The souting quantity of a machining solution 7 is made into minuteness by controlling a machining solution quantity regulating solenoid valve 9 in a solution feed tank 8 and its feed takes palce whereby an amplitude phenomenon or a bending phenomenon in a wire electrode 1 is solved and, what is more, when the electrode 2 returns to a disconnection position passing through a gap 3 of the already machined path after the disconnection is repaired, contact between the wire electrode 1 and a work 2 due to the machining solution is prevented from occurring, thus making continuation of the machining attainable.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for repairing the wire electrode at the machining start position when the wire electrode is broken during wire electrical discharge machining, and then returning the already machined trajectory to the wire electrode breakage position. The present invention relates to a wire electrical discharge machining apparatus that prevents contact between a wire electrode and a workpiece when the wire passes through a gap and returns.

[Prior art]

For 4-electroelectric workpieces, imitate wire electrodes! fi
,? A machining fluid is supplied between the workpiece and the wire pole, and a pulsed discharge is generated 2 times 9 times under the medium of the JD machining fluid, and the discharge energy is discharged. Wire and electrical discharge machining equipment for cutting workpieces are well known)
The advantage is that complex cutting of hard metals and the like can be easily performed with good precision.

However, when a workpiece is to be subjected to electrical discharge cutting, it is necessary to feed the wire electrode so as to penetrate the workpiece.

The wire electrode is usually a thin metal length, and the wire electrode often breaks due to an abnormal situation occurring during electrical discharge machining, and in such cases.

Processing start position - Move the X-Y cross table and replace the wire electrode with a new one at the process start position.

There are two types of wire electrode repair work: one is done automatically, and the other is by acquisition.

After the repair of the wire electrode is completed, the wire electrode is fed one after another, passing through the gap in the vertical machining trajectory, and changing the wire electrode cutting edge position.
In order to continue the cutting process before the wire electrode disconnection, the wire electrode and the workpiece are supplied with machining liquid, and the pulsed radioactive ore is removed. The electric discharge cutting process is continued before attaching the wire hole.

FIG. 1 is a conventional type, and shows an example in which the wire shear passes through the gap of the vertical machining locus.

(1) is the wire electrode, (2J l is the workpiece, (3) is the gap of the vertical machining trajectory - (41 is the cutting waste, (5) is the upper machining liquid supply nozzle, (61 is the lower machining liquid supply nozzle, (7)
is the processing fluid. The wire electrode (1) moves along the vertical machining trajectory (31
When passing through the wire, due to the influence of the amplitude of the wire electrode, the wire \jL pole (1) and the workpiece (2) come into contact, and the wire electrode (η) is cut by the workpiece (2), resulting in cutting waste. (4
7lJ''- occurs, leading to a short-circuit phenomenon.Also, the aggravation of this cutting phenomenon leads to disconnection of the c9 wire electrode.

In this way, when returning to the wire redundant wire breakage position, the wire electrode passes through the gap of the vertical machining trajectory, and the gap through which the wire electrode passes is usually the diameter of the wire electrode plus 0. Since the wire electrode is very small, about 0.05 mm to 0.06 vrvr, it often comes into contact with the workpiece when the wire electrode passes through the gap of the vertical machining trajectory. The pole is attached to the workpiece,
Cυ is cut, cutting) N is generated, the L wire electrode and the workpiece are short-circuited by the cutting waste, the wire electrode returns to the disconnected position, and when attempting to continue the electrical discharge cutting process, the short-circuit occurs. Unable to generate electrical discharge, he has no choice but to experiment with electrical discharge cutting.

Furthermore, if the wire electrode is cut into a workpiece, the wire electrode may not only be cut but may also be broken, making it impossible to continue the electric discharge cutting process.

[Summary of the invention]

The present invention has been made in view of the above-mentioned conventional problems,
The purpose of this is to repair the wire electrode at the machining start position when the wire electrode breaks in the wire electrical discharge machining device, pass through the gap in the vertical machining trajectory, return to the wire electrode breakage position, and continue electrical discharge cutting. Above, the wire electrode is moving 1!1! during the vertical machining trajectory. Wire electrical discharge machining that prevents contact between the wire electrode and the workpiece when passing through the Y, eliminates the generation of cutting waste on the wire electrode and wire electrode breakage, and allows the discharge cutting process to continue smoothly when the wire electrode breaks. The goal is to provide equipment.

In order to achieve the above object, a wire electrical discharge machining apparatus according to the present invention has a wire electrode facing a conductive workpiece through a minute gap, and a machining fluid supplied to the minute gap. The generated discharge energy is used to cut the workpiece, and when the wire electrode breaks, the wire is automatically moved to the machining start position I\ via the wire electric 4ffivX-Y cross table, and the wire is cut at the machining start position. In a wire electrical discharge machining device that, after repairing the electrode, passes the wire electrode through the gap in the vertical machining locus, returns to the wire electrode disconnection position, and then generates discharge energy to continue machining. The present invention is characterized in that when returning to the wire electrode disconnection position, a reduced amount of machining fluid different from the amount of machining fluid supplied during electrical discharge machining is supplied between the wire electrode and the workpiece.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 6C is a sectional view of this embodiment, showing a state in which machining fluid is supplied to the gap between the wire' electrode and the workpiece.

Figure 4 is a control diagram for the amount of machining fluid supplied, showing the supply tank, white is the solenoid valve for adjusting the amount of machining fluid, (10) is the manual adjustment valve, (11
) is a pump that sprays machining fluid (7) from the upper and lower machining fluid supply nozzles (51 (61) to prevent contact when the 6° wire electrode (1) passes through the gap (, 51) of the vertical machining trajectory. A machining fluid is injected into the gap between the wire electrode (1) and the workpiece (2).This allows the wire to Electrode (1
) and the workpiece (2) can be prevented.

In addition, pure water is generally used as the machining fluid, and even if the wire electrode (1) and the workpiece ('2J) come into contact, the machining fluid will act as a lubricant and reduce the coefficient of friction. Damage to the 9-wire electrode (1) can be prevented.

However, the spouting amount of the machining fluid (7) is very easy (
li's machining fluid (the force promotes the occurrence of the amplitude phenomenon or deflection phenomenon of the shear wire'-pole, rendering the contact prevention function of the machining fluid meaningless). In order to prevent the amplitude phenomenon and deflection phenomenon of the wire electrode caused by this machining fluid, the spout amount of machining fluid (7) is 2 to prevent contact between the wire electrode (1) and the workpiece (2) due to the machining fluid. The wire electrode ( The amplitude and deflection phenomena described in 1) are eliminated, and both the prevention of contact between the wire electrode and the workpiece due to the machining fluid can be achieved at the same time.

〔Effect of the invention〕

As described above, according to the wire tassel processing apparatus according to the present invention, abnormal situations such as damage to the wire electrode caused by contact between the wire electrode and the workpiece due to contact between the wire electrode and the workpiece can be prevented, and smooth discharge can be achieved. One-cut processing becomes possible.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a state 2 in which a conventional wire electrode contacts a workpiece when passing through a gap, and Fig.
Figure 3 is an explanatory diagram showing an example of the power of the invention, and is an explanatory diagram of a case where a processing liquid tank is placed in the gap between the wire electrode and the workpiece. It is a diagram. In each figure, the same members are given the same symbols, (1) is the wire electrode, (2) is the limb processed product, f31 is the gap of the processed trajectory,
(4) is cutting waste, (5) is the upper machining fluid supply nozzle, (6
) is the lower machining fluid supply nozzle, (8) is the machining fluid tank, (
9) is a solenoid valve for machining liquid volume, (10) is a manual adjustment valve, and (11) is a machining liquid suction pump. Attorney Saburo Dokimura Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A wire electrode is placed opposite to an electrically conductive workpiece through a small gap, and the workpiece is cut by electric discharge energy generated under the medium of the number of machinings supplied to the small gap, and On the other hand, when the wire electrode breaks, the wire electrode is automatically moved to the machining start position via the X-Y cross table, the wire electrode is repaired at the machining start position, and then the wire is inserted into the gap of the already machining trajectory. In a wire release processing device, the wire returns to the extremely clear position while passing the electrode, and then releases α energy to continue processing.
7a'% characterized in that a reduced amount of machining liquid, which is different from the amount supplied during machining, is supplied between the wire electrode and the workpiece when the machining process is carried out. Processing equipment.