JPH0457623A - Wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To prevent the electric erosion due to working chips on the surface of a workpiece by removing the working chips from the upper surface of the workpiece by jetting fluid on the surface, in a wire-cut electric discharge machine for carrying out the electric discharge machining in an insulative working liquid. CONSTITUTION:When electric discharge work is carried out by applying the pulse voltage between and a wire electrode and a workpiece 2 in an insulative working liquid in a working tank 1, the generated working chips are discharged from the gap between the wire electrode and the workpiece 2, by the working liquid jetted from an upper part working liquid jetting nozzle 4 and a lower part working liquid jetting nozzle 5. The discharged working chips tend to be piled on the upper surface of the workpiece 2 which is separated from a working part and on which the flow of the working liquid is relatively gentle. However, the working liquid is always jutted on the whole of the upper surface of the workpiece 2 from a working liquid injection nozzle 13, and the piling of the working chips on the upper surface of the workpiece 2 is prevented. Accordingly, the workpiece 2 is prevented from being electrically eroded by the working chips.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wire-cut electrical discharge machining device, and particularly relates to a wire-cut electrical discharge machining device that can prevent electrical corrosion caused by machining powder on the surface of a workpiece. .

[Prior Art] FIG. 4 is a side sectional view showing a schematic configuration of a conventional wire-cut electrical discharge machining apparatus.

In the figure, (1) is a machining tank that stores machining fluid;
Electric discharge machining is performed in this process. (2) is the workpiece to be processed, (3) is the surface plate that fixes the workpiece (2),
(4) is an upper machining fluid jetting nozzle that spouts machining fluid onto the upper surface of the workpiece (2); (5) is a lower machining fluid jetting nozzle that spouts machining fluid onto the bottom surface of the workpiece (2); ) is a tank that stores machining fluid, (7) is a pump that supplies machining fluid,
(8) is pipe A connecting tank (6) and pump (7)
, (9) is the pipe B connected to the outlet side of the pump (7), (
10) is a pipe line C1 (
11) is a pipe line for returning the machining fluid in the machining tank (1) to the tank (6).

A conventional wire-cut electrical discharge machining device is configured as described above, and performs electrical discharge machining by applying a pulse voltage between the wire electrode (not shown) and the workpiece (2) in an insulating machining fluid. I am doing it. That is, while moving a wire electrode (not shown) stretched between the upper machining liquid spouting nozzle (4) and the lower machining liquid spouting nozzle (5) in a state of micro-opposition to the workpiece (2), , while repeatedly applying a pulse voltage to the gap, simultaneously spouting machining fluid from both the upper machining fluid spouting nozzle (4) and the lower machining fluid spouting nozzle (5) onto the machining part of the workpiece (2). , electric discharge is caused between a wire electrode (not shown) and the workpiece (2), and the workpiece (2) is machined using the discharge energy. Also, at this time, the processing tank (1) is connected to the pipe C (1).
The machining fluid in the machining tank (1) is returned to the tank (6) through the pipe D (11), but the liquid level in the machining tank (1) is lower than the workpiece ( 2) It is set higher than the top surface. The conductivity of this machining fluid is also determined in order to prevent electrolytic corrosion on the surface of the workpiece (2) due to the influence of the machining voltage between the wire electrode and the machining tank (1) during machining. It is set high.

Note that conventional wire-cut electrical discharge machining devices of this type are disclosed in Japanese Patent Application Laid-open Nos. 55-157434 and 61-274.
812, JP-A-51-102530, and JP-A-59-169715.

[Problems to be Solved by the Invention] In the conventional wire-cut electric discharge machining apparatus as described above, machining powder generated during electric discharge machining is discharged from the upper machining fluid spouting nozzle (4).
) and the lower machining fluid spouting nozzle (5). Therefore, although these processing powders do not accumulate near the processing section of the workpiece (2), they sometimes accumulate at positions away from the processing section.

When processed powder accumulates on the upper surface of the workpiece (2),
There was a risk that electrical corrosion would occur between the machining powder and the workpiece (2), and the surface of the workpiece (2) would be corroded before the electrical discharge machining was completed. Therefore, after machining, the workpiece (2
) It was necessary to re-polish the surface.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire-cut electric discharge machining apparatus that prevents machining powder from accumulating on the upper surface of a workpiece and prevents electrical corrosion from occurring on the surface of the workpiece.

[Means for Solving the Problems] A wire-cut electric discharge machining apparatus according to the present invention performs electric discharge machining by applying a pulse voltage between a wire electrode and a workpiece (2) in an insulating machining fluid, By ejecting fluid over a wide range on the surface of the workpiece (2),
This is to remove processing powder from the upper surface of the workpiece (2).

[Function] In the present invention, when electrical discharge machining is performed by applying a pulse voltage between the wire electrode and the workpiece (2) in an insulating machining fluid, the fluid is applied to the surface of the workpiece (2). This method sprays out over a wide area and removes machining powder generated during electrical discharge machining from the top surface of the workpiece (2), so that the machining powder does not accumulate on the top surface of the workpiece (2). First, the workpiece (2
) No electrolytic corrosion occurs on the surface due to processed powder.

[Example code] The present invention will be explained in detail below.

FIG. 1 is a side cross-sectional view showing a schematic configuration of a wire-cut electric discharge machining apparatus according to an embodiment of the present invention.

In the figure, (1) to (11) indicate constituent parts that are the same as or correspond to the constituent parts of the above-mentioned conventional example.

In the figure, (12) is a fixture extended to the surface plate (3), (13) is a machining fluid jet nozzle fixed at a predetermined angle by the fixture (12), and (14) is a machining fluid jet nozzle. This is a conduit E that supplies machining fluid to the jet nozzle (3).

The wire-cut electric discharge machining apparatus of this embodiment is constructed as described above, and is a conventional wire-cut electric discharge machining apparatus to which a machining fluid ejecting nozzle (13) and the like are added. Note that the machining operation itself in which electrical discharge machining is performed by applying a pulse voltage between the wire electrode (not shown) and the workpiece (2) in an insulating machining fluid is the same as in the conventional example, so it will not be explained here. Omitted. In particular, the explanation will focus on the differences here.

In this embodiment as well, machining powder generated during electrical discharge machining is removed from the wire electrode (not shown) by machining fluid spouted from both the upper machining fluid spouting nozzle (4) and the lower machining fluid spouting nozzle (5). and the workpiece (2). The removed machining powder floats in the machining fluid and tries to accumulate on the upper surface of the workpiece (2), but between the upper machining fluid jet nozzle (4) and the workpiece (2), Usually, it is set at a distance of 0.1 mm or more, and since machining fluid is spouted around this upper machining fluid jet nozzle (4), is not deposited, but tends to be deposited on the upper surface of the workpiece (2), where the machining fluid flows relatively slowly, away from the machining section. However, in this embodiment, machining fluid is constantly jetted from the machining fluid jetting nozzle (13) toward the entire top surface of the workpiece (2) during machining, and machining powder is removed from the top surface of the workpiece (2). This prevents processing powder from accumulating on the upper surface of the workpiece (2). That is, the machining liquid jetting nozzle (13) fixed to the surface plate (3) via a fixture functions as a machining powder removing means for removing machining powder from the upper surface of the workpiece (2).

Therefore, unlike the conventional method, these processed powders do not accumulate at a position away from the processed portion of the workpiece (2), so the workpiece (2) is not electrolytically corroded by the processed powder. Therefore, the surface of the workpiece (2) will not be corroded. In this embodiment, a device in which one machining fluid jetting nozzle (13) is fixed to the surface plate (3) has been described, but a plurality of machining fluid jetting nozzles (13) may be used.

Particularly when machining a large workpiece (2), it is better to use a device that uses a plurality of machining liquid jetting nozzles (13).

Next, other embodiments will be explained. FIG. 2 is a side cross-sectional view showing a schematic configuration of a wire-cut electric discharge machining apparatus according to another embodiment of the present invention, and FIG. 3 is a schematic diagram of a wire-cut electric discharge machining apparatus according to still another embodiment of the present invention. FIG. 3 is a side sectional view showing the configuration. In the figure, (1) to (11) indicate constituent parts that are the same as or correspond to the constituent parts of the above-mentioned conventional example.

In Fig. 2, (15) is the machining fluid jet nozzle (13)
This is a nozzle drive unit that drives the. This nozzle drive unit (
15) is fixed to the surface plate (3) via a fixture (12), and the machining fluid ejection nozzle (13) is moved by this nozzle drive section (15). That is, during machining, the nozzle drive unit (15) swings the machining fluid jetting nozzle (13) vertically and horizontally, the jetting angle of the machining fluid jetted from the machining fluid jetting nozzle (13) changes, and the workpiece ( 2) Machining fluid is sprayed over the entire upper surface. That is, the machining fluid spouting nozzle (
13) functions as a processing powder removing means for removing processing powder from the upper surface of the workpiece (2).

Therefore, in this embodiment as well, processing powder is removed from the upper surface of the workpiece (2), as in the embodiment shown in FIG.
Processing powder does not accumulate on the upper surface of the workpiece (2). For this reason, electrolytic corrosion due to processed powder does not occur, so the workpiece (2)
The surface will not corrode. In particular, when machining a workpiece (2) with a large surface using one machining fluid spouting nozzle (13), the machining fluid spouting nozzle (13)
It is effective to move 3).

In Fig. 3, (16) is the upper machining fluid jet nozzle (4).
), and (17) is a machining fluid spouting port provided on the lower surface of the machining fluid spouting portion (16). This machining fluid spouting part (16) moves in the same direction as the upper machining fluid spouting nozzle (4), and this spout (
17), machining liquid is ejected onto the upper surface of the workpiece (2). That is, the machining fluid spouting part (16) attached to the upper machining fluid spouting nozzle (4) and this spout (17) are connected to the workpiece (
2) It functions as a processing powder removal means for removing processing powder from the upper surface of the machine.

Therefore, in the case of this embodiment as well, as in each of the above embodiments, the processed powder is removed from the upper surface of the workpiece (2), and no processed powder is deposited on the upper surface of the workpiece (2). Therefore, since electrolytic corrosion due to processing powder does not occur, the surface of the workpiece (2) does not corrode. In particular, the upper machining fluid spout nozzle (
Since the downward liquid is ejected intensively in the vicinity of 4), that is, in the vicinity of the machined part, corrosion in the vicinity of the machined part can be prevented.

As described above, the wire-cut electrical discharge machining apparatus of each of these embodiments is capable of processing a wire electrode and a workpiece (2) in an insulating machining fluid.
), a wire-cut electrical discharge machining means for performing electrical discharge machining by applying a pulse voltage between
The machining liquid etc. is sprayed over a wide area on the surface of the workpiece (
2) Machining fluid spout nozzle (1) that removes machining powder from the top surface.
3) Alternatively, a machining powder removing means consisting of a machining liquid spouting part (16) or the like is provided.

When electrical discharge machining is performed in the insulating machining fluid, the machining fluid etc. is sprayed over a wide range on the surface of the workpiece (2), and the machining powder generated during the electrical discharge machining is transferred to the workpiece (2). By removing the powder from the upper surface of the workpiece, processing powder is prevented from being deposited on the surface of the workpiece (2), and the processing powder is prevented from being eaten by the processing powder on the surface of the workpiece (2).

Therefore, since the surface of the workpiece (2) does not corrode unlike in the conventional case, there is no need to re-polish the surface of the workpiece (2) after electrical discharge machining.

By the way, in each of the above embodiments, the machining fluid is applied to the workpiece (2
), the material to be ejected is not limited to machining liquid, but may also be a gas such as air, as long as it is a fluid that can remove machining powder. good.

Further, the processing powder removing means for ejecting fluid onto the surface of the workpiece (2) and thereby removing processing powder from the upper surface of the workpiece (2) uses a nozzle as explained in each of the above embodiments. A fixed injection method may be used, or an injection method may be used in which the injection angle from the nozzle is changed one-dimensionally or two-dimensionally.

[Effects of the Invention As described above, the wire-cut electric discharge machining apparatus of the present invention has the following advantages:
Equipped with a wire-cut electrical discharge machining means that performs electrical discharge machining in an insulating machining liquid, and a machining powder removal means that sprays fluid over a wide range on the surface of the workpiece, pulses are generated between the wire electrode and the workpiece. When electrical discharge machining is performed by applying a voltage, fluid is ejected onto the surface of the workpiece and machining powder generated during electrical discharge machining is removed from the top surface of the workpiece. This prevents deposition on the surface and prevents electrolytic corrosion caused by machining powder on the workpiece, so the surface of the workpiece does not corrode and the surface of the workpiece can be re-polished after electrical discharge machining. There is no need to do the same.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view showing a schematic configuration of a wire-cut electrical discharge machining device which is an embodiment of the present invention, and FIG. 2 is a side sectional view showing a schematic configuration of a wire-cut electrical discharge machining device which is another embodiment of the present invention. 3 is a side sectional view showing a schematic configuration of a wire-cut electric discharge machining apparatus according to another embodiment of the present invention, and FIG. 4 is a side sectional view showing a schematic configuration of a conventional wire-cut electric discharge machining apparatus. It is. In the figure, 2: workpiece 4: upper machining fluid jetting nozzle 5: lower machining fluid jetting nozzle 13: machining fluid jetting nozzle 15: nozzle drive section 16: machining fluid jetting section 17: spout. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts. Agent: Patent attorney Masuo Hitoyoshi and 2 others Heisei (voluntary) October 23, 2010 5. Subject to amendment

Claims (1)

[Scope of Claims] Wire-cut electrical discharge machining means for performing electrical discharge machining by applying a pulse voltage between a wire electrode and a workpiece in an insulating machining fluid, and a method for ejecting fluid onto the surface of the workpiece. A wire-cut electric discharge machining apparatus comprising: a machining powder removing means for removing machining powder from the upper surface of a workpiece.