JP3319270B2 - Electrode wire for electric discharge machining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode wire for electric discharge machining used for wire electric discharge machining, and more particularly to an electrode wire for electric discharge machining having excellent tensile strength and electrical conductivity.

[0002]

2. Description of the Related Art Wire electric discharge machining is a machining method for fusing a workpiece to a predetermined size by an electric discharge phenomenon between a traveling wire electrode wire and the workpiece, and is difficult to mechanically cut and cut. Widely used for processing molds and the like. In the recent mold processing field, there is a high demand for higher precision and higher speed.
/ Mm ² (about 1,500 MPa) or higher tensile strength,
The emergence of ultrafine electrode wires having high conductivity characteristics of 5% IACS or more has been awaited.

As this kind of electrode wire, a W single electrode wire having a high tensile strength has been conventionally used. W electrode wire
Tensile strength of about 400kgf / mm ² (about 4,000MP
a) and about 4 times the strength of general-purpose brass electrode wires. For this reason, the W electrode wire has a wire diameter of 0.1 m for higher accuracy.
Even if the thickness is reduced to m or less, it is possible to apply a sufficient tension that does not cause the vibration of the electrode wire that causes a reduction in processing accuracy. However, taking into account that W itself is a kind of rare metal and is a difficult-to-process material, and that the electrode wire is a consumable item, a very fine W electrode wire using W as an electrode wire is very expensive. It will be something. Furthermore, W
In the case of using the electrode wire, the feed reel and the take-up reel, which apply a voltage to the electrode wire, were so worn out that the strength was too high, and an unstable discharge phenomenon was likely to occur due to a change in contact resistance and the like.

[0004]

In order to improve the disadvantages of these W electrode wires, brass (Cu-35%
A composite electrode wire in which a Cu--Zn alloy layer is coated around a high-strength steel wire having a tensile strength intermediate between that of a Zn (Zn) electrode wire and a W electrode wire has been developed as a high-precision machining electrode wire (for example, see Japanese Unexamined Patent Publication (Kokai) No. 2002-157572). JP-A-56-126528).

[0005] As shown in FIG.
Has a high tensile strength steel 12 as a tension member as a core portion, and a Cu—Zn alloy layer 13 is disposed so as to cover the core portion. Thereby, the composite electrode wire 11 has a tensile strength of about 15
0 to 200 kgf / mm ² (about 1,500 to 2,000
MPa), sufficient tension can be applied to high-precision machining, and wear on the feed reel and the take-up reel can be reduced. That is, the composite electrode wire 11 has an appropriate tensile strength and can be supplied at relatively low cost.

However, since the composite electrode wire 11 has the Cu—Zn alloy layer 12 having a low tensile strength disposed in the outer layer, the composite electrode wire 11 is required to have a sufficient tensile strength as the composite electrode wire 11. The proportion of the high tensile strength steel 12 in the core portion must be increased. However, in this case, since the electrical conductivity of the high tensile strength steel 12 is only about 10% IACS, the electrical conductivity of the composite electrode wire 11 decreases,
There is a major problem that it is difficult to increase the electric discharge machining current which is indispensable for increasing the speed of electric discharge machining.

Accordingly, the present invention solves the above-mentioned problems, and provides an electric discharge machine for electric discharge machining having both high tensile strength and high electrical conductivity, which enables higher precision and higher speed of electric discharge machining. It is to provide an electrode wire.

[0008]

According to a first aspect of the present invention, a core material made of a metal material is coated with a two-phase dispersion strengthened composite, and the two-phase dispersion strengthened composite is provided. in the electrical discharge machining electrode wire coated with Cu-Zn alloy layer, the two-phase dispersion strengthened complex, a powder of Fe or Fe alloy, a mixed powder of powder of Cu or Cu alloy
Dispersed structure in which one of the metals is in the dispersed phase as the parent
Are formed Te, powder volume fraction of the Fe or Fe alloy in the mixed powder material are those 10 to 90%.

A second aspect of the present invention is a core material made of a metal material.
Is coated with a two-phase dispersion enhanced composite, and the two-phase dispersion enhanced
Machining Electrode with Copper-Type Composite Coated with Cu-Zn Alloy Layer
In line, the two-phase dispersion strengthened composites, and Fe or Fe alloy, is formed in the cast material of the Cu or Cu alloy, the weight percentage of the Cu or Cu alloy in the casting material is 10% or more It is an electrode wire for electric discharge machining characterized by the following.

A third aspect of the present invention is an electrode for electric discharge machining, wherein a core material made of a metal material is covered with a two-phase dispersion strengthened composite, and the two-phase dispersion strengthened composite is covered with a Cu—Zn alloy layer. In the line, the two-phase dispersion strengthened composite is Ni or N
The base material is a mixed powder of any one of i-alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, and stainless steel, and Cu or Cu alloy powder
One of the metal have been made <br/> shape becomes dispersed tissue became dispersed phase as said Ni or N in the mixed powder body
The powder has a volume ratio of any one of i-alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, and stainless steel material of 10 to 90%.

According to a fourth aspect of the present invention, there is provided a core material made of a metal material.
Is coated with a two-phase dispersion strengthened composite,
Electrode wire for electrical discharge machining with composite coated with Cu-Zn alloy layer
In the above, the two-phase dispersion strengthened composite is made of Ni or N
i-alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, any one of stainless steel materials,
An electrode wire for electric discharge machining characterized by being formed of a cast material with Cu or Cu alloy, wherein the weight percentage of the Cu or Cu alloy in the cast material is 10% or more.

According to a fifth aspect of the present invention, there is provided an electrode for electric discharge machining, wherein a core material made of a metal material is covered with a two-phase dispersion strengthened composite, and the two-phase dispersion strengthened composite is covered with a Cu—Zn alloy layer. In the line, the two-phase dispersion strengthened composite is Ni or N
A base material is a mixed powder of i-alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, or any one of stainless steel powder and Ag or Ag alloy powder
One of the metal have been made <br/> shape becomes dispersed tissue became dispersed phase as said Ni or N in the mixed powder body
The powder has a volume ratio of any one of i-alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, and stainless steel material of 10 to 90%.

According to a sixth aspect of the present invention, there is provided a core material made of a metal material.
Is coated with a two-phase dispersion strengthened composite,
Electrode wire for electrical discharge machining with composite coated with Cu-Zn alloy layer
In the above, the two-phase dispersion strengthened composite is made of Ni or N
i-alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, any one of stainless steel materials,
It is formed in the cast material of Ag or an Ag alloy, a discharge machining electrode wire, wherein the percentage by weight of the Ag or Ag alloy in the casting material is 10% or more.

According to a seventh aspect of the present invention, there is provided an electrode for electric discharge machining, wherein a core material made of a metal material is covered with a two-phase dispersion strengthened composite, and the two-phase dispersion strengthened composite is covered with a Cu—Zn alloy layer. In the line, the two-phase dispersion-strengthened composite is composed of a mixture of a stainless steel material, a powder of Ni or a Ni alloy, and a powder of Fe or an Fe alloy as a base,
Genus is Tei shall be formed by a distributed organization became dispersed phase.

[0015] The invention according to claim 8 is a core material made of a metal material.
Is coated with a two-phase dispersion strengthened composite,
Electrode wire for electrical discharge machining with composite coated with Cu-Zn alloy layer
In the above, the two-phase dispersion-strengthened composite is made of a stainless steel, Ni or a Ni alloy, and Fe or Fe.
It is an electrode wire for electric discharge machining characterized by being formed of a casting material with an alloy.

According to a ninth aspect of the present invention, the core material has a volume ratio of 3
0% or less, the volume ratio of the two-phase dispersion strengthened composite is 40%
The electrode wire for electrical discharge machining according to any one of claims 1 to 8, wherein the volume ratio of the Cu-Zn alloy layer is 65% or less.

According to a tenth aspect of the present invention, the core material is 10k
It is gf / mm ² or more of claims 1 to 8 discharge machining electrode wire according to any one of a metallic material having a room temperature tensile strength.

The reason for limiting the above numerical range will be described below.

The reason why the volume fraction of the two-phase dispersion strengthened composite is limited to 40% or more is that if the volume fraction of the two-phase dispersion strengthened composite is not at least 40% or more, high precision and high precision during electric discharge machining can be achieved. This is because characteristics required for speeding up cannot be obtained. The reason that the volume ratio of the core material is limited to 30% or less is that the core material only needs to be contained to an extent that the workability during powder extrusion or wire drawing can be ensured.

Fe or Fe alloy in the mixed powder body,
Ni or Ni alloy, V or V alloy, Ta or Ta
The reason for limiting the volume ratio of the alloy, Cr or Cr alloy, or the powder of the stainless steel material to the range of 10 to 90% is that Fe or Fe alloy, Ni or Ni alloy,
V or V alloy, Ta or Ta alloy, Cr or Cr
If the volume ratio of the alloy or stainless steel powder is less than 10%, sufficient tensile strength cannot be obtained. Conversely, if it exceeds 90%, the electrical conductivity of the electrode wire for electric discharge machining is greatly reduced.

Cu or Cu alloy in cast material, Ag
Alternatively, the weight percentage of Ag alloy, Fe or Fe alloy is 1
The reason for limiting to 0% or more is that when the weight percentage of Cu or Cu alloy, Ag or Ag alloy, Fe or Fe alloy in the cast material is less than 10%, the electrical conductivity of the electrode wire for electric discharge machining is greatly reduced. is there.

The reason for limiting the use of a metal material having a room temperature tensile strength of 10 kgf / mm ² or more as the core material is as follows.
If the room-temperature tensile strength of the core material is less than 10 kgf / mm ² , a plastic instability phenomenon called a necking phenomenon occurs in plastic working of a composite material having a large difference in deformation resistance between the constituent materials, resulting in disconnection and the like. Trouble is more likely to occur,
This is because the strength of the two-phase dispersion strengthened composite of the present invention, that is, the deformation resistance is increased.

According to the above construction, the core material is mainly
A two-phase dispersion-strengthened composite as a strength member and a Cu-Zn alloy are arranged around it, so that it is excellent in electric discharge machining and has high tensile strength and high electrical conductivity. Electrode wire, and
Strain hardening is achieved by surface reduction at room temperature, and as a result, the occurrence of a plastic instability phenomenon can be prevented, and good surface reduction workability can be maintained.

[0024]

Embodiments of the present invention will be described below.

As shown in FIG. 1, an electrode wire 1 for electric discharge machining according to the present invention comprises a core material 2, a two-phase dispersion strengthened composite 3 and Cu
-It is composed of three layers of a Zn alloy layer 4.

The core material 2 is arranged to ensure workability during powder extrusion and wire drawing.
For example, it is formed in a rod shape having a predetermined length and diameter made of Fe or an Fe alloy.

The two-phase dispersion-strengthened composite 3 is arranged to improve the high tensile strength and the high electrical conductivity characteristics. For example, a mixed powder of Fe or Fe alloy powder and Cu or Cu alloy powder is used. One metal is a dispersed phase
It is made of a cast material of Fe or an alloy of Fe and Cu or a Cu alloy, and is provided so as to cover the core material 2.

The Cu—Zn alloy layer 4 is provided to improve the electric discharge machining property, and is provided so as to cover the two-phase dispersion strengthened composite 3. Cu-Z to which 10-50 wt% of Zn having good electric discharge machining characteristics is added as the Cu-Zn alloy layer 4
Other than the n alloy, a composite material in which Zn or a Zn-based alloy is coated around a metal material that can be cold-cut with a cross-sectional reduction rate of 50% or more in a cold state may be used.

As the constituent material of the two-phase dispersion strengthened composite 3 in the electrode wire 1 for electric discharge machining of the present invention, in addition to the combination of Fe and Cu, Ni, V, Ta, Cr, and stainless steel A combination of Cu and Ni, V, Ta,
A combination of one of Cr and stainless steel material with Ag, a combination of any of stainless steel material and Ni and Fe, and a combination powder or cast material in these combinations.

The constituent material of the core material in the electrode wire for electric discharge machining according to the present invention is not particularly limited to Fe or an Fe alloy, and has a tensile strength of 10 kgf / m at room temperature.
It is needless to say that any metal material of m ² (about 100 MPa) may be used, for example, Nb or Nb alloy, Cu or Cu alloy. Furthermore, core material 2
For example, a material in which the periphery of a rod made of Fe or an Fe alloy is coated with, for example, Cu or a Cu alloy may be used, whereby the conductivity of the electrode wire for electric discharge machining can be further increased.

Although the core material in the electrode wire for electric discharge machining of the present invention hardly contributes to the characteristics of the electrode wire for electric discharge machining, the present invention is applied, and pure Cu is used as the core material. By positively increasing the volume ratio, it is possible to increase the electrical conductivity of the electrode wire for electric discharge machining.

When a mixed powder is used as a matrix of the two-phase dispersion strengthened composite 3, the core 2 is placed at the center of a Cu—Zn alloy tube having a diameter larger than that of the core 2, and then the Cu—
A mixed powder of Fe or Fe alloy powder and Cu or Cu alloy powder is filled between the Zn alloy tube and the core material 2. Thereafter, by performing surface reduction such as powder extrusion and wire drawing, the electrode wire 1 for electric discharge machining having the two-phase dispersion strengthened composite 3 as a strength member can be obtained.

When a cast material is used as the base of the two-phase dispersion strengthened composite 3, the F obtained by melting or casting is used.
After a cast material of e or Fe alloy and Cu or Cu alloy is formed into a rod shape, it is inserted into a Cu-Zn alloy tube having a larger diameter than the Fe-Cu rod. Then, Fe
Forming a hole in the center of the Cu rod, inserting the core material 2 into the hole, and extruding and drawing the same, thereby forming an electrode wire for electric discharge machining having the two-phase dispersion strengthened composite 3 as a strength member. 1 can be obtained.

In the present invention, a two-phase dispersion strengthened composite formed from a mixed powder of a metal (alloy) powder and a metal (alloy) powder or a cast material of a metal (alloy) and a metal (alloy) is used. Although used as a member, other methods for forming the two-phase dispersion strengthened composite include the following methods.

(A) A method of forming a two-phase dispersion-strengthened composite by reducing the surface area by rolling a laminated composite in which different kinds of metal sheets are alternately laminated.

(B) A continuous fiber composite in which a number of other rod-shaped metals (alloys) are buried in one metal (alloy) powder is used as a matrix, and the two-phase dispersion-reinforced composite is formed by extrusion and drawing. How to form the body.

Next, a mixed powder of Fe or Fe alloy powder and Cu or Cu alloy powder, or a cast material of Fe or Fe alloy and Cu or Cu alloy, has two-phase dispersion strengthening having high tensile strength characteristics. The mechanism that changes to a type complex will be described.

A mixed powder of Fe and Cu is used as a base and
Is formed as a dispersed structure in which one of the metals has become a dispersed phase
In the case where the composite is a two-phase dispersion strengthened composite,
-After filling in the Zn alloy tube, the powder structure of Fe and Cu is compressed and adhered by surface reduction processing such as powder extrusion and wire drawing, and finally one of the metals becomes a dispersed phase. Changes to

In a state in which the powders of Fe and Cu do not adhere to each other, since the powder is merely a mixed powder, it naturally does not exhibit the characteristics required for the strength member, and the tensile strength of the mixed powder does not increase. Is also very low.

However, when the powders adhere to each other, F
The characteristics of the e / Cu alloy are exhibited. Since Fe has a low solid solubility in Cu, Fe does not form a solid solution in Cu but has a dispersed structure in which Fe is dispersed in Cu. As the cohesion of the Fe and Cu powders starts to form a dispersed structure, a maximum of 250 kgf / mm ² (about 2,500 MPa
A tensile strength reaching a) can be obtained, and the two-phase dispersion strengthened composite 3 satisfies the characteristics required for the strength member of the electrode wire 1 for electric discharge machining.

On the other hand, even when the cast material of Fe and Cu is a two-phase dispersion strengthened composite, Fe hardly forms a solid solution in Cu, so that Fe in the cast material is dispersed in a Cu matrix. Become an organization. By extruding and drawing this cast material, the granular Fe becomes fibrous Fe,
As a result, a maximum of 250 kgf / mm ² (about 2,500 M
As a result, a two-phase dispersion strengthened composite 3 that satisfies the characteristics required for the strength member of the electrode wire 1 for electric discharge machining can be obtained.

In the electrode wire for electric discharge machining of the present invention, C
Since u or Ag is used as a constituent material of the two-phase dispersion-strengthened composite, even after the dispersed structure is formed, Cu or Cu having high conductivity is used.
Alternatively, the presence of Ag makes it possible to obtain a two-phase dispersion strengthened composite having high conductivity characteristics.

[0043]

(Example 1) Pure iron for industrial use as a core material, Fe powder having a particle size of about 200 μm,
The mixed powder of the Cu powder having a particle size of about 100μm as a host
One metal forms a dispersed structure with a dispersed phase
Is a two-phase dispersion strengthened composite, Cu-35% Z
An electrode wire for electric discharge machining was manufactured using an n alloy (JISC2700) as a Cu-Zn layer.

The volume ratios of the constituent materials of the electrode wire for electric discharge machining were as follows: Cu-Zn: 18 (vol%);
(Vol%) and the amount of Cu powder in Fe / Cu is 35
(Vol%), pure Fe (core material) was 5 (vol%), and the wire diameter was 0.1 (mm).

(Embodiment 2) An electrode wire for electric discharge machining was produced in the same manner as in Embodiment 1, using the same components as in Embodiment 1.

The volume ratio of the constituent materials of the electrode wire for electric discharge machining is as follows.
(Vol%) and the amount of Cu powder in Fe / Cu is 35
(Vol%), pure Fe (core material) was 5 (vol%), and the wire diameter was 0.07 (mm).

(Embodiment 3) An electrode wire for electric discharge machining was produced in the same manner as in Embodiment 1, using the same components as in Embodiment 1.

The volume ratio of the constituent materials of the electrode wire for electric discharge machining is as follows: Cu-Zn is 18 (vol%), Fe / Cu is 77
(Vol%) and the amount of Cu powder in Fe / Cu is 35
(Vol%), pure Fe (core material) was 5 (vol%), and the wire diameter was 0.05 (mm).

(Example 4) A mixed powder body of industrial pure Nb as a core material, a V powder having a particle size of about 200 µm, and a Cu powder having a particle size of about 100 µm was used as a base material.
One metal is formed as a dispersed structure with a dispersed phase.
This was used as a two-phase dispersion strengthened composite, and an electrode wire for electric discharge machining was produced in the same manner as in Example 1.

The volume ratios of the constituent materials of the electrode wire for electric discharge machining were as follows: Cu-Zn: 18 (vol%);
(Vol%) and the Cu powder in V / Cu is 45 (v
ol%), pure Nb (core material) was 5 (vol%), and the wire diameter was 0.07 (mm).

[0051] (Example 5) core of commercially pure Nb, and industrial Ta powder having a particle diameter of about 200 [mu] m, a mixed powder of a Cu powder having a particle size of about 100μm mother
As a body, one metal becomes a dispersed structure with a dispersed phase
The electrode wire for electric discharge machining was produced in the same manner as in Example 1 by using the formed one as a two-phase dispersion strengthened composite.

The volume ratio of the constituent materials of the electrode wire for electric discharge machining is as follows.
(Vol%) and the Cu powder in Ta / Cu is 25
(Vol%), pure Nb (core material) was 5 (vol%), and the wire diameter was 0.07 (mm).

[0053] (Example 6) core of commercially pure Nb, and industrial Cr powder having a particle diameter of about 200 [mu] m, a mixed powder of a Cu powder having a particle size of about 100μm mother
As a body, one metal becomes a dispersed structure with a dispersed phase
The electrode wire for electric discharge machining was produced in the same manner as in Example 1 by using the formed one as a two-phase dispersion strengthened composite.

The volume ratio of the constituent materials of the electrode wire for electric discharge machining was 18% (vol%) for Cu-Zn and 77% for Cr / Cu.
(Vol%) and the Cu powder in Cr / Cu is 40
(Vol%), pure Nb (core material) was 5 (vol%), and the wire diameter was 0.07 (mm).

(Example 7) One metal is dispersed using a mixed powder body of industrial pure Fe as a core material, industrial stainless steel (SUS) powder having a particle size of about 100 μm, and Cu powder having a particle size of about 50 μm as a base material. Minute that became a phase
An electrode wire for electric discharge machining was produced in the same manner as in Example 1 by using the dispersed structure formed as a two-phase dispersion strengthened composite.

The volume ratio of the constituent materials of the electrode wire for electric discharge machining was 18% (vol%) for Cu-Zn and 7% for SUS / Cu.
7 (vol%) and the Cu powder in SUS / Cu is 4
0 (vol%), pure Fe (core material) was 5 (vol%), and the wire diameter was 0.07 (mm).

(Example 8) Ni powder having a particle diameter of about 100 µm was prepared by using a core material of industrial pure Fe.
As a matrix powder mixture of the Cu powder having a particle diameter of about 50μm
One metal is formed as a dispersed structure with a dispersed phase.
This was used as a two-phase dispersion strengthened composite, and an electrode wire for electric discharge machining was produced in the same manner as in Example 1.

The volume ratio of the constituent materials of this electrode wire for electric discharge machining is as follows.
(Vol%) and the Cu powder in Ni / Cu is 35
(Vol%), pure Fe (core material) was 5 (vol%), and the wire diameter was 0.07 (mm).

(Example 9) One metal is dispersed using a mixed powder of an industrial pure Fe as a core material, an industrial stainless steel (SUS) powder having a particle diameter of about 100 μm, and an Ag powder having a particle diameter of about 50 μm as a base material. Minute that became a phase
An electrode wire for electric discharge machining was produced in the same manner as in Example 1 by using the dispersed structure formed as a two-phase dispersion strengthened composite.

The volume ratio of the constituent materials of the electrode wire for electric discharge machining is as follows: Cu-Zn is 18 (vol%), Fe / Ag is 77
(Vol%) and the Ag powder in Fe / Ag is 45%
(Vol%), pure Fe (core material) was 5 (vol%), and the wire diameter was 0.07 (mm).

Example 10 A mixed powder of an industrial pure Cu as a core material, an industrial stainless steel (SUS) powder having a particle size of about 100 μm, and an industrial Fe powder having a particle size of about 50 μm was used as a base material for one metal. Is a dispersed phase
An electrode wire for electric discharge machining was produced in the same manner as in Example 1 by using a composite having a dispersed structure as described above as a two-phase dispersion strengthened composite.

The volume ratio of the constituent materials of the electrode wire for electric discharge machining is as follows: Cu-Zn is 18 (vol%), SUS / Fe is 5
7 (vol%) and the Fe powder in SUS / Fe is 5
0 (vol%), pure Cu (core material) is 25 (vol%),
The wire diameter was 0.07 (mm).

(Comparative Example 1) An electrode for electric discharge machining using carbon steel (high tensile strength steel) containing 0.25 wt% C as a core material and a Cu-35% Zn alloy (JIS C2700) as a Cu-Zn layer A wire was made.

The volume ratio of the constituent materials of the electrode wire for electric discharge machining is as follows: Cu-Zn is 30 (vol%), and high tensile strength steel is 70 (vol%).
(Vol%), and the wire diameter was 0.07 (mm).

Table 1 shows the specifications of the electrode wires for electric discharge machining in Examples 1 to 10 and Comparative Example 1.

[0066]

[Table 1]

Next, the tensile strength and electrical conductivity of the electrode wires for electric discharge machining in Examples 1 to 10 and Comparative Example 1 were measured. Table 2 shows tensile strength (kgf / mm ² ) and conductivity characteristics (% IACS).

[0068]

[Table 2]

As can be seen from Table 2, in Examples 1 to 10, all had a tensile strength of 150 kgf / mm.
² (about 1,500 MPa) or more and 15% IAC
It has a conductivity of S or more, and shows very excellent tensile strength characteristics and conductivity characteristics. On the other hand, in Comparative Example 1, the tensile strength was 205 kgf / mm ² (about 2,000
0 MPa) and excellent tensile strength properties, but since carbon steel (high tensile strength steel) with low conductivity is used as the core material, the conductivity is only 12% IACS, and the conductivity properties are low. Inferior.

From this example, when the tensile strength of only the two-phase dispersion-strengthened composite is calculated backward according to the composite rule, the maximum strength in Example 3 is about 250 kgf / mm ² (about 2,500 MPa).
a). Therefore, the tensile strength is at most about 100
Cu-, which has only kgf / mm ² (about 1,000 MPa)
When combining a Zn alloy and a two-phase dispersion strengthened composite,
Unless the volume ratio of the two-phase dispersion strengthened composite is at least 40% or more, it is not possible to obtain high tensile strength characteristics and high conductivity characteristics required for higher precision and higher speed of electric discharge machining. I understand.

[0071]

In summary, according to the present invention, since the two-phase dispersion strengthened composite is disposed as the strength member,
An excellent effect that an electrode wire for electric discharge machining having high tensile strength and high electrical conductivity can be obtained is exhibited.

[Brief description of the drawings]

FIG. 1 is a view showing a cross section of an electrode wire for electric discharge machining according to the present invention.

FIG. 2 is a view showing a cross section of a conventional electrode wire for electric discharge machining.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode wire for electric discharge machining 2 Core material 3 2 phase dispersion strengthening type composite 4 Cu-Zn alloy layer

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor, Tsukasa Yamanaka 3550 Kida Yomachi, Tsuchiura City, Ibaraki Prefecture Hitachi Systems, Ltd.System Materials Research Laboratory (72) Inventor Kazutaka Sasaki 3550 Kida Yomachi, Tsuchiura City, Ibaraki Hitachi (72) Inventor Takamitsu Kimura 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture In-house Touraura Plant, Hitachi Cable Company, Ltd. (56) References JP-A-9-150322 (JP, A) JP-A-63-34022 (JP, A) JP-A-60-67026 (JP, A) JP-A-8-287749 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23H 7/08

Claims (10)

(57) [Claims] 1. A core material made of a metal material is coated with a two-phase dispersion-strengthened composite, and the two-phase dispersion-strengthened composite is coated with Cu-
In the electrode wire for electric discharge machining covered with a Zn alloy layer, the two-phase dispersion strengthened composite is formed by using a mixed powder of Fe or Fe alloy powder and Cu or Cu alloy powder as a matrix.
And one of the metal is formed in a dispersed phase and became dispersed tissue, the Fe or Fe in the mixed powder body
An electrode wire for electric discharge machining, wherein a powder volume ratio of the alloy is 10 to 90%. 2. A two-phase dispersion strengthened core material made of a metal material.
Coated with a composite, and the two-phase dispersion strengthened composite is
In the electrode wire for electric discharge machining covered with a Zn alloy layer, the two-phase dispersion strengthened composite is composed of Fe or an Fe alloy and Cu
Or formed with cast material of the Cu alloy, electrical discharge machining electrode wire, wherein the weight percentage of the Cu or Cu alloy in the casting material is 10% or more. 3. A core material made of a metal material is coated with a two-phase dispersion strengthened composite, and the two-phase dispersion strengthened composite is formed of Cu-Z.
In the electrode wire for electric discharge machining covered with the n alloy layer,
The phase dispersion strengthened composite is a mixed powder of a powder of any one of Ni or Ni alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, stainless steel, and a powder of Cu or Cu alloy One metal with the body as the mother
Is formed as a dispersed structure having a dispersed phase, and any one of the above Ni or Ni alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, and stainless steel material in the mixed powder body is formed. Volume ratio of one powder is 10
An electrode wire for electric discharge machining, characterized in that the electrode wire has a thickness of about 90%. 4. A two-phase dispersion strengthened core material made of a metal material.
Coated with a composite, and the two-phase dispersion strengthened composite is
In the electrode wire for electric discharge machining covered with the n alloy layer,
The phase dispersion strengthened composite is formed of a cast material of Ni or Ni alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, any one of stainless steel materials, and Cu or Cu alloy, It is characterized in that the weight percentage of Cu or Cu alloy in the cast material is 10% or more.
Discharge machining electrode wire according to symptoms. 5. A core material made of a metal material is coated with a two-phase dispersion strengthened composite, and the two-phase dispersion strengthened composite is formed of Cu-Z.
In the electrode wire for electric discharge machining covered with the n alloy layer,
The phase dispersion strengthened composite is a mixed powder of Ni or a Ni alloy, V or V alloy, Ta or a Ta alloy, Cr or a Cr alloy, a powder of any one of stainless steel, and a powder of Ag or an Ag alloy One metal with the body as the mother
Is formed as a dispersed structure having a dispersed phase, and any one of the above Ni or Ni alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, and stainless steel material in the mixed powder body is formed. Volume ratio of one powder is 10
An electrode wire for electric discharge machining, characterized in that the electrode wire has a thickness of about 90%. 6. A two-phase dispersion strengthening of a core material made of a metal material.
Coated with a composite, and the two-phase dispersion strengthened composite is
In the electrode wire for electric discharge machining covered with the n alloy layer,
The phase dispersion strengthened composite is formed of a cast material of Ni or Ni alloy, V or V alloy, Ta or Ta alloy, Cr or Cr alloy, any one of stainless steel materials, and Ag or Ag alloy, JP that percentage by weight of the Ag or Ag alloy is 10% or more in the casting material
Discharge machining electrode wire according to symptoms. 7. A core material made of a metal material is coated with a two-phase dispersion-strengthened composite, and the two-phase dispersion-strengthened composite is coated with Cu-Z.
In the electrode wire for electric discharge machining covered with the n alloy layer,
The phase dispersion strengthened composite is made of stainless steel, Ni or N
One of the metals becomes a dispersed phase with a mixed powder of any of the i-alloy powder and Fe or Fe alloy powder as a base material.
Dispersion tissue is formed by electrical discharge machining electrode wire, characterized in Tei Rukoto. 8. A two-phase dispersion strengthened core material made of a metal material.
Coated with a composite, and the two-phase dispersion strengthened composite is
In the electrode wire for electric discharge machining covered with the n alloy layer,
The phase dispersion strengthened composite is made of stainless steel, Ni or N
and either i alloys, electrical discharge machining electrode wire, characterized in that it is formed by the cast material of Fe or Fe alloy. 9. The method according to claim 1, wherein the core material has a volume ratio of 30% or less,
The volume fraction of the phase dispersion strengthened composite is 40% or more, and the Cu-
The electrode wire for electric discharge machining according to any one of claims 1 to 8, wherein a volume ratio of the Zn alloy layer is 65% or less. 10. The core material, 10 kgf / mm ² or more of claims 1 to 8 discharge machining electrode wire according to any one of a metallic material having a room temperature tensile strength.