JP2003326420A - Electrode wire for electric discharge machining - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode wire for electric discharge machining to be decreased in the amount of wear powder generated during electric discharge machining. <P>SOLUTION: The electrode wire 10 for electric discharge machining forms a lubrication film 12, formed that a film thickness is 0.005-0.020 μm and the film thickness is uniform throughout a longitudinal direction, on the outer periphery of an electrode wire body 11 having an outside diameter of 0.1 mm or more. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machining electrode wire, and more particularly to a wire cut electric discharge machining electrode wire having a lubricating coating as an outermost layer.

[0002]

2. Description of the Related Art Wire cut electric discharge machining is for cutting an object to be processed by causing an electric discharge between an electrode wire and the object to be processed. As the electrode wire for electric discharge machining, Cu-Zn
Simple substance (Cu-35Zn, Cu-38Zn, or Cu-4
Brass wire made of 0 Zn (wt%) or the like, a coated wire having a coating layer of a multi-layer structure formed around a core material made of a Cu alloy,
Also, a Zn-plated wire having a Zn layer formed on the surface of a brass wire or a covered wire is used.

In recent years, the machining speed of electric discharge machining has tended to increase. In order to meet the demand for higher speed, as shown in FIG. 5, a lubricant such as paraffin is applied to the surface of each electrode wire described above, and the electric discharge machining electrode wire 50 having the lubricating coating 52 on the outermost layer is formed. ing.

[0004]

However, in the conventional electric discharge machining electrode wire 50 having the lubricating coating 52, the relationship between the outer diameter of the electrode wire body (each electrode wire) 51 and the film thickness of the lubricating coating 52 is shown. Since no consideration was given, the thickness of the lubricating coating 52 was not sufficient (thin) for the outer diameter of the electrode wire body 51. Moreover, since the thickness of the lubricating coating 52 was thin (for example, 0.005 μm or less), it was difficult to form the thickness uniformly over the longitudinal direction of the electrode wire 50. That is, when the electrode wire 50 is used by running it with an electric discharge machine, the lubricating film 52 has a very thin film thickness and the film thickness is not uniform in the longitudinal direction. The performance was not good. As a result, as shown in FIGS. 2 and 3, each pulley 22 of the electric discharge machine 20 is
a to 22f, felt (pad) 26, guide guide 2
3, 23, or the guide dies 24a, 24b, etc. (only the guide dies 24a are shown in FIG. 3), the electrode wire 5
Abrasion powder 31 was generated due to friction with 0.

Since the generation amount of the abrasion powder 31 increases as the running length increases, clogging occurs in the guides and guide dies of the electric discharge machine 20 as the electric discharge machining progresses. As a result, it becomes difficult to continue running the electrode wire 50, and in the worst case, the electrode wire 50 may be broken.

An object of the present invention, which was conceived in consideration of the above circumstances, is to provide an electrode wire for electric discharge machining in which the amount of abrasion powder generated during electric discharge machining is small.

[0007]

In order to achieve the above object, the electrode wire for electric discharge machining according to the present invention has a film thickness of 0.005 to 0. 020
A lubricating coating having a thickness of μm and a uniform film thickness in the longitudinal direction is formed.

Specifically, the above lubricating film is formed of a paraffin film.

As a result, the amount of abrasion powder generated during electrical discharge machining is reduced, and there is no risk of clogging of the guide or guide die of the electrical discharge machine.
As a result, there is no possibility of breaking the electrode wire.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a cross-sectional view of the electric discharge machining electrode wire according to the first embodiment.

As shown in FIG. 1, the electric discharge machining electrode wire 10 according to this embodiment has a film thickness of 0.005 to 0.020 μm on the outer circumference of an electrode wire body 11 having an outer diameter of 0.1 mm or more.
In addition, a paraffin coating (lubrication coating) 12 having a uniform film thickness in the longitudinal direction is formed. The paraffin-based coating mentioned here indicates all coatings formed by using paraffin hydrocarbons.

The outer diameter of the electrode wire main body 11 is specified to be 0.1 mm or more, preferably 0.1 to 0.3 mm.

Further, the thickness of the paraffin coating 12 is
The range of 0.005 to 0.020 μm is defined because the effect as a lubricating film cannot be sufficiently obtained when the film thickness is less than 0.005 μm, and the wear of the film 12 when the film thickness is greater than 0.020 μm. This is because the amount of debris, that is, abrasion powder, is increased.

Further, the uniformity of the film thickness of the paraffin coating 12 is not particularly limited as long as it is uniform in the longitudinal direction, but specifically, there is a variation when the average film thickness is 1. ± 0.3, preferably ± 0.1 (the variation when the average film thickness is 100% is ± 30%, preferably ± 10%).

As the method for forming the paraffin coating 12, all methods conventionally used for forming the coating can be applied and are not particularly limited, and examples thereof include a spraying method and a roll coating method. To be

Next, the operation of the present embodiment will be described with reference to the accompanying drawings.

As shown in FIG. 2, the electrode wire 10 delivered from the delivery drum 21 of the electric discharge machine 20 is connected to each pulley 22.
a to 22f, a felt (pad) 26, and guide guides 23, 23, and guide dies 24a, 24
Guided between b.

A work (workpiece) 25 is disposed between the guide dies 24a and 24b, and electric discharge machining is performed by applying a voltage between the traveling electrode wire 10 and the work 25. Is cut. The electrode wire 10 after being used for cutting the work 25 is appropriately wound up by a winding means such as a winding drum (not shown).

Here, the electrode wire 10 has a film thickness of 0.005 to 0.
A paraffin film (lubrication film) 12 having a thickness of 020 μm and a uniform film thickness in the longitudinal direction is formed. That is, compared with the conventional electrode wire 50 shown in FIG. 5, since the layer thickness of the lubricating coating is formed thicker, the film thickness can be formed more uniformly in the longitudinal direction.

Therefore, when the electrode wire 10 is used in the electric discharge machine 20, the straight running property of the electrode wire becomes very good, and the pulleys 22a to 22f, the felt (pad) 26, and the guide guide 23 of the electric discharge machine 20 are improved. , 23, or the guide dies 24a, 24b, etc., the amount of abrasion powder 31 generated by friction with the electrode wire 10 is ⅕ or less as compared with the conventional case, which is extremely small. In other words, even if electrical discharge machining is performed,
Since the abrasion powder 31 is hardly generated in the electric discharge machine 20, each of the pulleys 22a to 22a with the progress of electric discharge machining.
f, the guide guide 23, 23, or the guide die 24a,
No clogging occurs at 24b. As a result, the electrode wire 10 can be stably and continuously run during the electric discharge machining, and there is no possibility that the electrode wire 10 will be broken.

As described above, the embodiment of the present invention is not limited to the above-mentioned embodiment, and it is needless to say that various other embodiments are possible.

[0023]

Example 1 First, an outer diameter of 0.2 mm (200 μm) formed by forming a coating layer of Cu—Zn with a layer thickness of 20 to 40 μm on the outer circumference of a core material made of a Cu alloy.
The electrode wire body of is prepared in advance. This outer diameter is 0.2m
A paraffin film having a film thickness of 0.010 μm and a uniform film thickness in the longitudinal direction is formed on the outer periphery of the electrode wire main body of m, and an electrode wire for electric discharge machining is manufactured.

(Comparative Example 1) A paraffin film having a film thickness of 0.010 μm is formed on the outer periphery of an electrode wire main body similar to that of Example 1 to prepare an electrode wire for electric discharge machining.

Next, the electrode wires of Example 1 and Comparative Example 1 were used as evaluation samples 41a and 41b, and were wound on the delivery drum 42 of the wear test apparatus 40 shown in FIG. The sample 41a (or 41
b) is a waste collecting felt (pad) 43a, 43b.
The weight 43 is run on the felt 43a so that it is sandwiched between them and the condition (tension) is the same as when actually running with the electric discharge machine. The traveling speed at this time is the same as the actual traveling speed with the electric discharge machine.

After that, the sample 41a (or 41b) was run for 1000 m, and felts (pads) 43a, 43
The weight of the abrasion powder attached to b is measured.

In the case of Sample 41b which is the electrode wire of Comparative Example 1, the amount of abrasion powder generated was as large as 0.010 g or more.
On the other hand, sample 41a which is the electrode wire of Example 1
In the case of No. 1, the amount of abrasion powder generated was 0.002 g or less, which was very small, ie, 1/5 or less, as compared with the sample 41b.

[0028]

In summary, according to the present invention, the film thickness is 0.00 on the outer circumference of the electrode wire body having an outer diameter of 0.1 mm or more.
By forming a lubricating coating having a thickness of 5 to 0.020 μm and a uniform film thickness in the longitudinal direction, the amount of abrasion powder generated during electrical discharge machining is reduced, and a guide or guide for an electrical discharge machine is provided. It has an excellent effect that there is no risk of clogging with the guide die.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electric discharge machining electrode wire according to a first embodiment.

FIG. 2 is a schematic front view of an electric discharge machine used for electric discharge machining.

FIG. 3 is an enlarged view of the guide die in FIG.

FIG. 4 is a schematic front view of a wear test device used in Examples.

FIG. 5 is a cross-sectional view of a conventional electric discharge machining electrode wire.

[Explanation of symbols]

10 EDM electrode wire 11 Electrode wire body 12 Paraffin coating (lubricating coating)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takamitsu Kimura             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. (72) Inventor Katsunori Sawahata             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. (72) Inventor Shigeki Oshima             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. F-term (reference) 3C059 AA01 AB05 DA06 DB02

Claims (2)

[Claims] 1. A lubricating coating having a film thickness of 0.005 to 0.020 μm and a uniform film thickness in the longitudinal direction is formed on the outer periphery of an electrode wire body having an outer diameter of 0.1 mm or more. An electrode wire for electric discharge machining characterized in that 2. The electric discharge machining electrode wire according to claim 1, wherein the lubricating coating is a paraffin coating.