JPS63318219A - Wire electric discharge device - Google Patents

Abstract

PURPOSE:To facilitate the connection of wire electrode by providing a seal member on the end of an upper machining liquid nozzle, pressing the seal member against the top face of a workpiece, and feeding not only a jet water column forming liquid but also a machining liquid to the upper machining liquid nozzle. CONSTITUTION:At the time of connecting a wire electrode 1 through a machining starting hole which is smaller than the diameter of a jet water column 14, a seal member 16 on the end of an upper machining liquid nozzle 8 is closely attached to a workpiece 2 by means of a Z-axis driving motor 17 and a jet water column forming liquid 11 as well as an electric discharge machining liquid 3 are allowed to flow. Thereby, the machining liquid is filled in the upper machining liquid nozzle 8 and is put into a machining starting hole 15 under pressure turning into a jet stream, and a wire electrode 1 is guided from the machining starting hole 15 to a lower wire electrode guide 6 along this stream and connected. Thereby, the wire electrode can be easily connected even to the machining starting hole which is smaller than the diameter of a jet water column.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a wire electrical discharge machining apparatus, particularly a jet water column (a water column that guides a wire electrode from an upper wire electrode guide to a lower wire electrode guide during wire electrode connection). This paper relates to the improvement of a wire electrode connection mechanism using a "jet water column".

[Prior Art] A conventionally used wire electrical discharge machining apparatus will be explained based on the drawings.

FIG. 4 is an explanatory cross-sectional view of the vicinity of a machining fluid nozzle of a conventional wire electric discharge machining apparatus using a wire electrode connection method using a jet water column.

In FIG. 4, (1) is a wire electrode, (2) is a workpiece, (3) is a machining liquid, (4) is an upper wire electrode guide,
(5) is the upper diamond die, (6) is the lower wire electrode guide, (7) is the lower diamond die, (8)
is the upper machining liquid nozzle, (9) is the lower machining liquid nozzle, (1
0) is an upper processing liquid nozzle support member fixed to the head.

FIG. 5 is a cross-sectional explanatory diagram showing a connection method using a jet water column.

In FIG. 5, (11) is the jet water column generating liquid, (
12) is a jet water column generation nozzle (hereinafter referred to as "jet nozzle"), (13) is a nozzle outlet of the jet nozzle (12), (14) is a jet water column, and (15) is a machining start hole.

Next, the operation of these conventional wire electric discharge machining devices will be explained.

As shown in Figure 2, wire electrical discharge machining equipment uses a wire electrode (
1) and the workpiece (2) are placed opposite to each other with a small gap through the machining fluid (3), and a high-frequency pulse voltage applied to both generates an electric discharge, and the energy is used to drive the workpiece (2). It is something to be processed.

The wire electrode (1) is disposable and is fed under tension from the supply reel to the collection section. During this time, the workpiece (
2), and machining is performed at the penetrating portion, but near the top and bottom of the workpiece (2), the upper diamond die (5) of the upper wire electrode guide (4) and the lower wire electrode guide (
The lower diamond die (7) of the wire electrode (1)
) and machining liquid (3) for cooling and discharge of machining sludge.
) is ejected from the upper machining liquid nozzle (8) and the lower machining liquid nozzle (9) onto the machining part in substantially the same axial direction as the wire electrode (1).

At the start of processing or when the wire electrode (1) is broken, the wire electrode (1) must be stretched from the upper wire electrode guide (4) through the lower wire electrode guide (6) to the collection section. As shown in Fig. 4, this connection is performed by an upper wire electrode guide (
4), the wire electrode (1) fed through the upper diamond die (5) is heated through the jet water column generation machining fluid (1).
Guided by the jet water column (14) formed from the nozzle outlet (13) of the jet nozzle (12) toward the lower wire electrode guide (6) in step 1), the machining start hole (15), the lower diamond die (7), Lower wire electrode guide (6
), and then transported to a recovery section using a fluid, belt, etc. (not shown).

[Problems to be Solved by the Invention] Since the conventional wire electrical discharge machining apparatus is configured as described above, in a machining start hole larger than the diameter of the jet water column,
As shown in Figure 5, the wire electrode can be connected well, but if the machining starting hole is smaller than the diameter of the jet water column, the jet water column will be scattered on the surface of the workpiece (2) as shown in Figure 6. There was a problem in that wire connection could not be performed because the wire electrode (1) could not be guided.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a wire electrical discharge machining apparatus that can connect a wire electrode even in a machining start hole smaller than the diameter of a jet water column.

[Means for Solving the Problems] The wire electrical discharge machining apparatus according to the present invention is provided with a sealing member at the tip of the upper machining fluid nozzle, and when connecting to a machining start hole at least smaller than the diameter of the jet water column, the wire electrical discharge machining apparatus according to the present invention The sealing member is pressed against the workpiece in addition to the generation liquid, and the machining liquid as well as the jet water column generation liquid is supplied to the upper machining liquid nozzle.

That is, in a wire electrical discharge machining device that generates a thin water column between an upper wire electrode guide and a lower wire electrode guide and guides and connects a wire electrode by the water column, two systems of liquid are used: one for machining and one for generating the water column. system, its control adjustment means, and a sealing member at the tip of the upper machining liquid nozzle, and when connecting the wire in a machining start hole smaller than the diameter of the jet water column, the sealing member is tightly attached to the upper surface of the workpiece. , a wire electric discharge machining apparatus characterized in that a machining fluid for machining is supplied together with the water column generating fluid.

[Function] When the wire discharge application device of the present invention is connected to a machining start hole that is at least smaller in diameter than the jet water column, the upper machining fluid nozzle with a sealing member at the tip is pressed against the surface of the workpiece. By supplying machining fluid not only to the jet water column generating fluid but also to the upper machining fluid nozzle, the machining fluid press-fitted into the machining start hole guides the wire electrode to the machining start hole, and machining starts from the bottom surface of the workpiece. The hole becomes a kind of jet nozzle to guide the wire electrode to the lower wire electrode guide.

Next, embodiments of the present invention will be described.

[Example] FIG. 1 is a detailed explanatory diagram of the present invention.

In FIG. 1, (16) is a sealing member provided at the tip of the upper processing liquid nozzle (8).

FIG. 2 is a schematic explanatory diagram showing the entire wire electrical discharge machining apparatus, and in the figure (17) is a Z-axis drive motor that moves the upper machining liquid nozzle (8) up and down.

Note that the same reference numerals indicate the same or corresponding parts, so the explanation thereof will be omitted.

Next, the operation of the wire electrical discharge machining apparatus of the present invention will be explained.

As shown in Fig. 1, when connecting the wire electrode at a machining start hole smaller than the diameter of the jet water column (14), drive the Z-axis drive motor (17) to seal the tip of the upper machining liquid nozzle (8). The member (16) is brought into close contact with the upper surface of the workpiece (2).

Then, a conventional jet water column generation liquid (11) is flowed, and a machining liquid for electrical discharge machining (3) is also flowed.

As a result, the inside of the upper processing liquid nozzle (8) and jet nozzle (12), the seal member (16), and the workpiece (2)
) The upper surface, the area surrounded by the upper machining fluid nozzle (8) is filled with machining fluid and is press-fitted into the machining start hole (15).
The wire electrode (1) passes through the machining liquid hole (15) along the flow.
).

From the lower surface of the workpiece (2), the machining start hole (15) serves as a kind of jet nozzle to guide the wire electrode (1) to the lower wire electrode guide (6) for wire connection.

If the machining start hole (15) is larger than the jet water column (14), there is no problem in bringing the sealing member (16) into close contact with the upper surface of the workpiece (2), but the machining liquid (3) for electrical discharge machining may be larger than the jet water column. If the generation liquid (11) and the production liquid (11) are flowed at the same time, the jet water column (14) will interfere and the wire electrode (1) will not be able to be guided properly, so do not flow it.

It may be possible to manually select whether or not to flow the machining fluid (3) for electrical discharge machining when connecting the wire electrode (1), and there are multiple machining start holes (15) with various diameters. In some cases, it is also possible to automatically switch by NC device command depending on the machining block.

During machining, the Z-axis drive motor (17) is driven to raise the upper machining liquid nozzle (8) to a predetermined position.

In the above embodiment, when connecting the wire to the machining start hole (15) smaller than the jet nozzle diameter, the Z-axis drive motor (17) is driven to lower the upper machining fluid nozzle (8) so that its tip The sealing member (16) provided at The seal member (16) is the workpiece (2)
It may be pressed against the upper surface. (19) is a φ ring.

[Effects of the Invention] As described above, according to the wire electrical discharge machining apparatus of the present invention,
A sealing member is provided at the tip of the upper machining fluid nozzle to press against the top surface of the workpiece and is configured to supply not only jet water column generation fluid but also machining fluid to the upper machining fluid nozzle, so that the diameter of the jet water column is smaller than the diameter of the jet water column. This has the effect that the wire electrode can also be connected to the machining start hole.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram when wire electrodes are connected according to one embodiment of the present invention, FIG. 2 is a schematic explanatory diagram showing the entire wire electric discharge machining apparatus, and FIG. 3 is a cross-sectional explanatory diagram showing another embodiment. Figure 4 is an explanatory cross-sectional view of the area around the machining liquid nozzle, including a conventional jet nozzle. Figure 5 is an explanatory diagram of the connection method when the machining start hole is larger than the diameter of the jet water column. Figure 6 is an explanatory diagram of the connection method when the diameter of the machining liquid nozzle is smaller than the diameter of the jet water column. It is an explanatory view of the connection method in the case of a machining start hole. In the figure, (1) is a wire electrode, (2) is a workpiece,
(3) is the machining fluid, (4) is the upper wire electrode guide, and (5) is the upper wire electrode guide.
) is the upper diamond die, (6) is the lower wire electrode guide, (7) is the lower diamond die, (8) is the upper machining liquid nozzle, (9) is the lower machining liquid nozzle, (10)
(11) is the liquid for jet water column generation, (12) is the jet nozzle, (13) is the jet nozzle outlet, (14) is the jet water column, (15)
is the machining start hole, (16) is the seal member, (17) is the Z-axis drive motor, (18) is the air cylinder, (19) is φ
It's a ring. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A wire electrical discharge machining device that generates a thin water column between an upper wire electrode guide and a lower wire electrode guide, and guides and connects a wire electrode by the water column, including two liquid systems for machining and for generating the water column; its control adjustment means;
A sealing member is provided at the tip of the upper machining liquid nozzle, and when connecting a wire in a machining start hole smaller than the diameter of the jet water column, the sealing member is brought into close contact with the upper surface of the workpiece, and the machining process is carried out together with the water column generating liquid. A wire electrical discharge machining device characterized by supplying machining fluid for use.