JPS60141432A - Wire-cut electric-discharge machining apparatus - Google Patents

Abstract

PURPOSE:To secure the stable work free from the extension or burn-out of a wire electrode by installing conductors in a working liquid supplied from a nozzle and in the air cut-off from the application of working liquid and permitting the electric conduction of each conductor through switching. CONSTITUTION:When the ordinary high-speed rough work is carried-out in a wire-cut electric-discharge machining apparatus, a working power source 7 is switched for a single polarity pulse 71. Since the electric-conduction polarity of the pulse 71 permits the electric conduction with a workpiece 3 as positive electrode and a wire electrode 1 as negative electrode, the electrode 1 is brought into electric conduction by carrying-out switching to an in-liquid conductor 5 by a switching device 8. When fine finishing work is performed by using a thin wire after rough working, electric conduction is performed by carrying-out switching to the both polarity pulses from a power source 7. In this case, electric conduction to the electrode 1 is performed by carrying-out switching to a conductor 6 installed in the air by the switching device 8. Therefore, the extension or burn-out of the electrode 1 can be prevented, and stable working is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soy-1 hook that performs electric discharge while running and moving a wire electrode.

1 In the Tsuya cut electric discharge machining equipment, the machining power supply and soi A
7 den 4! If an electric current is provided in the air, it will generate heat, so it has been proposed to provide it in the machining fluid supplied from the nozzle. In this case, the cooling effect can be expected, but
Since a water machining fluid is usually used as the machining fluid, there is a 10-john in the solution depending on the polarity of the wire.If the wire electrode is energized as an anode, erosion and consumption occur, which is a drawback.

In normal rough machining, the workpiece is used as an anode and the solenoid V electrode is used as a cathode, but during finishing machining, a regular polarity pulse is usually used. Such drawbacks cannot be avoided.

The present invention was proposed in order to improve this point, and it is possible to switch the energization by providing energizing currents in the machining fluid supplied from the nozzle and in the air not exposed to the machining fluid. This is called a characteristic.

The present invention will be explained below with reference to an example. Reference numeral 1 denotes a wire electrode, which is supplied from a reel (not shown) and runs upward or downward between the upper and lower guides 2 with a predetermined tension and speed. Facing and covering the processing. The workpiece 3 is usually fixed on a table equipped with a plane feeding device, and the workpiece 3 is fixed on a table equipped with a plane feeding device. A relative shape machining feed of a plane perpendicular to the Ii pole 1 is given so that a soi A7 cut can be made. Reference numeral 4 denotes an IC machining liquid supply nozzle provided on both sides and below of the workpiece, which allows the machining liquid supplied from the pump to flow along the wire electrode 1 from the upper and lower surfaces of the liquid adder 1 body 3.
is supplied to the machined groove portion that passes through it. 5 is energized when the liquid in the machining fluid supply nozzle 4 is in contact with the soi 1f electrode 1, and 6 is energized when it comes into contact with the soi 1f electrode 1 in the air outside the nozzle and not exposed to machining fluid. 7 is a machining power source, which applies pulse current between the solenoid electrode 1 and the workpiece 3 via the conductor, and the output supply pulse is a unipolar pulse 71. Positive r1 bipolar pulse 72
It is configured so that energization can be switched. Reference numeral 8 denotes a changeover switch between the conductors 5 and 6.

In electrical discharge machining, a pulse voltage is repeatedly applied from a power source 7 to the opposing gap between the wire electrode 1 and the workpiece 3 between the guide 2, which is moved with a predetermined tension and speed. Normally, when performing high-speed rough machining, the machining power source 7 is switched to unipolar pulse 71, and the pulse height Ill and pulse width τO are
n etc. are switched and set according to the conditions, and the set pulse is repeatedly supplied to perform one process. The polarity of this unipolar pulse 71 is such that the workpiece 3 is the anode and the wire electrode 1 is the cathode.
Change to i7J and energize wire electrode 1. Since the current in the liquid is cathode current, no erosion effect occurs.

If a water machining fluid is used as the machining fluid supplied from the nozzle 4, erosion of the anode will occur to some extent, but due to the unipolar pulse energization, this occurs only on the anode workpiece 3, and on the cathode wire current 5. doesn't happen. Therefore, this 10-john action allows stable electricity to be supplied without wear and deformation, and by increasing the energy supplied from the power source 1, high-speed soy A7 cutting by rough machining can be stably performed.

Therefore, even during rough machining with increased discharge energy in this case, the current-carrying current 5 and the wire electrode 1 in contact with it are sufficiently cooled by the machining liquid supplied into the nozzle 4, and are not heated by the large current application, and the current-carrying resistance is reduced. It can be stably processed without increasing, elongating, breaking, or sagging.

7JII I is used for second cuts after rough machining or fine finishing using a thin soy p.
Power is supplied from the power source 7 by switching to positive and negative polarity pulses. At this time, the switch 8 switches to the conductor 6 installed in the air (
When the soy-coated electrode 1 is energized, the conductor 6 becomes an anode, but the erosion effect does not occur and the current can be energized. Also, is this finishing process free? tf1 energy is lowered (minimal addition of 1°), so even if the current is passed through the air, there is little heating, and this increases the current carrying resistance and stabilizes the wire passing current without stretching or breaking the wire. Can be processed.

Also, by applying this positive polarity pulse, the soi F
The discharge marks, eruptions, etc. formed on the surface of the ffi pole 1 are properly abraded and removed, and this has the effect of reducing and controlling the C thickening wire diameter caused by the discharge marks, and the soy A7 electrode part after machining. When using a guide, especially a die guide, stable and precise guiding can be achieved, but any processing that has such an effect can be performed.

In addition, the switching of the current conductors 5 and 6 can be performed in conjunction with the switching of the machining power source 7, and can also be changed in conjunction with the polarity switching. Discrimination circuit [Discrimination - (Can also be designed to perform switching control. The energizing circuit can be arbitrarily used such as roller-shaped or brush-shaped, and instead of energizing both sides of the workpiece, one side of the workpiece is energized.) Well, any configuration is possible.

[Brief explanation of drawings]

The drawing shows one embodiment of the present invention (j4 configuration). １・・・・・・Wire connection electronic 2・・・・・・・・・Guide ３・・・・・・・・・Workpiece ４・・・・・・・・・Processing liquid nozzle 5・・・・・・・・・Liquid communication electronics 6・・・・・・・・・Airport electronics l・・・・・・・・・h111 power supply 8......Switcher Patent applicant Inoue Japax Laboratory Co., Ltd. Representative Inoue Cho 6′, “゛

Claims (1)

[Claims] Two liquids are supplied from a nozzle into the gap between the solenoid electrode running between the blades and the workpiece facing each other, and the workpiece is processed at the same time. T
In electrical discharge machining by adding pulsed dirt from an f source,
A conductive electric current that conducts electricity between the power supply No. 1 and the soi ~7 electrode is provided in the machining liquid supplied from the nozzle and in the air not exposed to the machining liquid. This is a wire-cut broadcasting device that is characterized by being able to switch between the current and the current for 1 hour.