JP6238938B2 - Manufacturing method of electrode wire for electric discharge machining - Google Patents

Description

  The present invention relates to an electrode wire for electric discharge machining. More specifically, the present invention is used for electric discharge machining, can contribute to environmental protection without falling off even if cut, and is a single metal press working in manufacturing. The present invention relates to a metal alloy wire that can be effectively simplified and can reduce the defect rate.

  As shown in FIG. 3, according to US Pat. No. 8,067,689, the first type of conventional processed electrode wire has an α (Alpha) phase copper metal wire 12, It is a solid alloy obtained by subjecting one brass coating layer 18 to galvanizing treatment, forming an electroplating layer 15 on the surface, and galvanizing copper metal wire 12 of α (Alpha) phase. The β (Beta) phase copper metal wire 12 is applied to the copper metal wire by galvanizing, and after the surface is drawn, heat treated again, and then electroplated with the copper-zinc solid solution 18, The solid alloy formed by heat treatment again becomes a metal alloy wire having a γ (Gamma) phase and a surface plated with the electroplating layer 15. However, as described above, since both are β (Beta) phases formed by galvanizing a copper alloy on the copper-zinc binary eutectic alloy of the conventional metal alloy wire, in the first step of the copper metal wire 12 After forming a β (Beta) phase by performing a certain hot dip galvanization, it is necessary to generate a plating layer to be subjected to electroplating, which is the second step of the copper metal wire 12, and then to perform a heat treatment, and γ (Gamma) In order to achieve the phase, it is necessary to perform a process of secondary electroplating and heat treatment. The copper core can be cut quickly, but the precision is difficult to control, the roughness is unfavorable, the production cost is high, the defect rate is high, the process time is long, and the metal alloy wire cuts the workpiece At this time, the electroplating layer 15 plated on the surface is easily worn and powdered and contaminated, and there is a problem that it does not have environmental protection.

  In addition, as shown in FIGS. 4 and 5, a second type of conventional processed electrode wire is disclosed in US Pat. No. 6,447,930, in which the electrode wire 3 includes a single-layer or multi-layer core 31 and copper or copper- One outer layer (α (Alpha) -Ms, α (Alpha) phase brass core) having a uniform α (Alpha) phase base composed of a zinc alloy, and 1 composed of zinc or a zinc alloy Sheath layers η (Eta) -Zn. Among them, the sheath layer 32 is optimally “applied” to the core when it is lower than one temperature below the diffusion appearance temperature, and the outer sheath layer is α (Alpha), β (Beta), γ (Gamma). Alternatively, it is composed of ε (Epsilon), and the brass core 31 is again applied and galvanized, thereby further improving the electrolytic corrosion performance and the discharge performance. However, the electrode wire 3 is applied again to the core 31 which is still brass with a single sheath layer 32 made of zinc or a copper-zinc alloy, and technically applied to a copper metal wire by hot dip galvanizing. The same is true for the conventional manufacturing technique disclosed above. As a result, the secondary manufacturing process (α (Alpha) + Zn → β (Beta), β (Beta) + Zn → γ () is still applied to the manufacturing process and the cutting performed to produce the workpiece. Gamma)) is required, and there is a defect in which the cost is high, the precision of the metal material forming the electrode wire is difficult to control, and the roughness is not preferable.

As shown in FIGS. 6 and 7, the third type of prior art is disclosed in European Patent EP 0733431, wherein the electrode wire 4 is composed of a single-layer or multi-layer core 41 and copper or copper-zinc alloy. One outer layer (α (Alpha) -Ms, α (Alpha) phase brass core) having a uniform α (Alpha) phase substrate, and one sheath layer η composed of zinc or a zinc alloy (Eta) -Zn. The electrode wire 4 is applied again to the core body 41, which is still brass, with a single sheath layer 42 made of zinc or a copper-zinc alloy, and technically applied to a copper metal wire by hot dip galvanizing. The same is true for the conventional manufacturing technique disclosed above.
As a result, the secondary manufacturing process (α (Alpha) + Zn → β (Beta), β (Beta) + Zn → γ () is still applied to the manufacturing process and the cutting performed to produce the workpiece. Gamma)) is necessary, the cost is high, the precision of the metal material forming the electrode wire is difficult to control, and there is a defect with an undesirable roughness, and the development of an electrode wire with an improved such defect has been eagerly desired. It was.

US Patent No. 8067689 US Pat. No. 6,447,930 European Patent EP 0 733 431

Accordingly, an object of the present invention is to provide an electrode wire for electric discharge machining that can form an electroplating layer on the surface only in one machining step without requiring a secondary manufacturing step as described above, and suppresses generation of fine dust due to cutting. Is to provide.

In order to solve the problems of the present invention, the present inventor has intensively studied, and as a result, an alloy body of all β (beta) phases is used, and the metal core is directly galvanized for low-temperature heat treatment. At the same time, focusing on the fact that a solid alloy containing a γ (Gamma), ε (Epsilon), and η (Eta) phase is formed by extending the low-temperature heat treatment time, and a metal alloy wire is obtained by metal pressing. The present invention has been conceived.
Thus, according to the invention of claim 1,
An electrode wire for electric discharge machining,

The electrode wire for electric discharge machining is obtained by mixing and dissolving copper 60% and zinc 40% and subjecting them to thermal solidification to convert the copper-zinc binary eutectic from a liquid phase to a solid solution phase of all β (Beta) phases. Γ (Gamma), ε (Epsilon) by controlling to extend the low temperature heat treatment time directly after galvanizing the metal nuclei of the alloy body of all β (Beta) phases. , Η (Eta) phase to form a solid alloy in which an electric layer is formed on the surface by mutual dissolution in the β (Beta) crystal phase, and at least γ (Gamma), ε (Epsilon), η ( There is provided an electrode wire for electric discharge machining characterized in that a metal alloy wire containing an Eta) phase is generated.
According to the second aspect of the present invention, when the content ratio of copper and zinc is 60:40, the all β (Beta) phase alloy body undergoes thermal solidification and is binary-coordinated by the equilibrium phase. It is formed by controlling the crystal solid alloy to include a γ (Gamma), ε (Epsilon), and η (Eta) phases, and to extend the low-temperature heat treatment time. Item 2. An electrode wire for electric discharge machining according to Item 1 is provided.
According to the invention of claim 3,
2. The electrical discharge machining according to claim 1, wherein the copper-zinc binary eutectic of the all β (Beta) phase alloy body undergoes thermal solidification and has a melting point of 903 ° C. to 900 ° C. 3. Electrode wire

Is provided. According to the invention of claim 4,
2. The electrical discharge machining apparatus according to claim 1, wherein after the galvanization is performed on the all β (Beta) phase alloy body, a low temperature heat treatment is performed to directly control a reaction temperature to a low temperature of 250 ° C. or less. An electrode wire is provided.
According to the invention of claim 5,
The reaction temperature for generating the η (Eta) phase from the all β (Beta) phase alloy body is controlled to 420 ° C. or lower, the reaction temperature for generating the ε (Epsilon) phase is controlled to 600 ° C. or lower, and γ (Gamma The electrode wire for electric discharge machining according to claim 1, wherein the reaction temperature for generating a phase is controlled to 835 ° C. or lower.

Is provided. According to the invention of claim 6,
A copper-zinc alloy material formed directly on a γ (Gamma) phase metal alloy wire by subjecting an alloy body of β (Beta) + γ (Gamma) to a low temperature heat treatment for controlling the reaction temperature to 500 to 400 ° C. The copper-zinc alloy material that has a cutting surface roughness Ra <0.05 or is subjected to a low-temperature heat treatment that controls the reaction temperature to 400 ° C., and is directly formed on a metal alloy wire in an ε (Epsilon) phase. A copper-zinc alloy material that has a cutting surface roughness Ra <0.05 or that is subjected to a low-temperature heat treatment that controls the reaction temperature to 250 ° C. and is directly formed on a metal alloy wire of η (Eta) phase The electrode wire for electric discharge machining according to claim 5, wherein the electrode wire has a surface roughness Ra <0.10.

  Therefore, the metal alloy wire of the all β (Beta) phase alloy body is completed by forming a plating layer by electroplating the surface of the wire in only one processing step without requiring secondary processing. In addition, the metal alloy wire of the prior art improves the defect that the powder can easily fall off in the electroplated layer plated on the surface when cutting the workpiece, thus contributing to environmental protection and the manufacturing process. The effect that can be shortened automatically and the effect that the defect rate can be reduced are achieved.

It is sectional drawing of the metal alloy material of the electrode wire for electrical discharge machining which concerns on one Embodiment of this invention. It is explanatory drawing which shows the equilibrium phase of copper and zinc of the electrode wire for electrical discharge machining which concerns on one Embodiment of this invention. It is sectional drawing 1 of the metal alloy material of the electrode wire for electric discharge machining of a prior art. It is sectional drawing 2 of the metal alloy material of the electrode wire for electric discharge machining of a prior art. It is a local enlarged view of the metal alloy material of FIG. It is sectional drawing 3 of the metal alloy material of the electrode wire for electric discharge machining of a prior art. It is a local enlarged view of the metal alloy material of FIG.

  Hereinafter, the content of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a metal alloy material of an electrode wire for electric discharge machining according to an embodiment of the present invention. As shown in the drawing, the electrode wire for electric discharge machining is a mixture of 60% copper and 40% zinc. It melts and undergoes thermal solidification (melting point 903 ° C. to 900 ° C.) from the liquid phase (melting temperature 909 ° C.), and the copper-zinc binary eutectic is transformed into an all-β (Beta) phase alloy 10 It is obtained by subjecting the metal core of the all β (beta) phase alloy body 10 to galvanization and then directly subjecting it to a low temperature heat treatment (controlling the reaction temperature to a low temperature of 250 ° C. or lower). Is. Furthermore, by controlling to extend the processing time of such low-temperature heat treatment, γ (Gamma), ε (Epsilon), and η (Eta) phases are generated, and mutual dissolution occurs in the β (Beta) crystal phase, resulting in the surface. The solid alloy on which the electrical layer is formed contains at least γ (Gamma), ε (Epsilon), and η (Eta) phases, has a low surface roughness, can be cut quickly, does not fall off, and has excellent adhesion. A metal alloy wire 1 is generated.

FIG. 2 is a diagram showing an equilibrium phase of copper and zinc according to the present invention. As shown in the figure, the vertical axis represents temperature (° C.), the upper horizontal axis represents the content ratio of copper (Cu), and the lower horizontal axis represents the content ratio of zinc (Zn). In the equilibrium phase diagram, after selecting two elements of copper and zinc, when the content ratio of copper and zinc is 60:40 (located in the hatched portion indicated by the reference numeral 10 in FIG. 2) After selecting the all β (Beta) phase alloy body 10 at the location), the all β (Beta) phase alloy body 10 is subjected to low-temperature heat treatment, and the equilibrium phase is applied to the binary eutectic solid alloy. Γ (Gamma), ε (Epsilon), and η (Eta) phases. Then, control is performed to extend the low-temperature heat treatment melting time (the reaction temperature is controlled to a low temperature of 420 ° C. or lower to generate a η (Eta) phase, or the reaction temperature is controlled to a low temperature of 600 ° C. or lower to the ε (Epsilon) phase. Or by controlling the reaction temperature to a low temperature of 835 ° C. or lower to generate a γ (Gamma) phase, like the part located at the part indicated by the reference numerals 1a, 1b, 1c in FIG. The surface roughness (Ra) value of the product is shown in Table 1 below.

  When it is preferable to perform a low temperature heat treatment for controlling the reaction temperature to 500-400 ° C. to the alloy body of β (Beta) + γ (Gamma), copper formed directly on the metal alloy wire 1 of γ (Gamma) phase The zinc alloy material 1a has a surface roughness Ra <0.05 and is cut precisely and quickly, or the reaction temperature is controlled to 400 ° C. with respect to an alloy body of β (Beta) + γ (Gamma) When it is preferable to perform the low temperature heat treatment, the copper-zinc alloy material 1b directly formed on the metal alloy wire 1 in the ε (Epsilon) phase has a surface roughness Ra <0.05 and is generally precise. Cutting is performed. Alternatively, when it is preferable to perform low temperature heat treatment for controlling the reaction temperature to 250 ° C. on the alloy body of β (Beta) + γ (Gamma), copper − formed directly on the metal alloy wire 1 of η (Eta) phase The zinc alloy material 1c has a surface roughness Ra <0.10, can be cut accurately and quickly without falling off, and if the all-β (beta) phase alloy body 10 is used, The metal alloy wire 1 containing at least a γ (Gamma), ε (Epsilon), and η (Eta) phase is galvanized directly on the core and subjected to low temperature heat treatment. Since the plating layer is formed by electroplating the surface of the wire only in the processing and manufacturing process, the surface layer of the β (Beta) phase is heat-treated on the α (Alpha) phase copper core, and then again. Secondary processing heat treatment on the surface layer of γ (Gamma) phase This solves the problem of the traditional complicated manufacturing process of the plating layer that needs to be processed, and improves the undesired defects in powder fall, roughness and precision of the electroplating layer plated on the processed surface layer The effect that can contribute to environmental protection, the effect that the manufacturing process can be shortened effectively, and the effect that the defect rate can be reduced are achieved, and the powder can be cut quickly and with low surface roughness. The effect which does not fall and is excellent in adhesive force is achieved.

  It should be noted that the above description is merely a preferred embodiment of the present invention, and the present invention is not limited thereto, and the invention and variations that produce the same effect based on the scope of the claims. Both should be included within the scope of the present invention.

Prior Art 12: Copper Metal Wire 15: Electroplating Layer 18: Copper-Zinc Solid Solution 3: Electrode Wire 31: Core Body 32: Sheath Layer 4: Electrode Wire 41: Core Body 42: Sheath Layer

Invention 10: Alloy body 1: Metal alloy wires 1a, 1b, 1c: Copper-zinc alloy material

Claims (5)

A method for manufacturing an electrode wire for electric discharge machining,
Copper 60% and zinc 40% are mixed and dissolved, and after thermal solidification, the copper-zinc binary eutectic is melt-solidified from a liquid phase to an alloy body of all β (Beta) phases of a solid solution phase, After the zinc alloy is plated on the solid solution phase β (Beta) phase alloy body, a low temperature heat treatment is performed, whereby the boundary between the solid solution phase all β (Beta) phase alloy body and the zinc plating layer. Γ (Gamma) phase, ε (Epsilon) phase, and η (Eta) phase are controlled to form a mutual solution with all β (Beta) phases of the solid solution phase, It consists of a solid solution phase all beta (beta) phase alloy body in which a boundary layer is formed on the outer surface of the all beta (beta) phase alloy body, and the boundary layer has at least a gamma (gamma) phase, epsilon (epsilon) ) Phase and η (Eta) phase, and an electric discharge machining electrode wire is generated. Manufacturing method of electrical discharge machining electrode wire that. In the case where the content ratio of copper and zinc is 60:40, an alloy body of all β (Beta) phases of the solid solution phase is formed through thermal solidification, and a binary eutectic solid solution phase is formed by an equilibrium phase. Γ (Gamma) phase, ε (Epsilon) phase, and η (Eta) phase exist at the boundary between the alloy body of all β (Beta) phases and the galvanized layer, and are formed by controlling the low-temperature heat treatment time. The method for producing an electrode wire for electric discharge machining according to claim 1, wherein:   The copper-zinc binary eutectic of the alloy body of all β (Beta) phases of the solid solution phase undergoes thermal solidification and has a melting point of 903 ° C to 900 ° C. Manufacturing method of electrode wire for electric discharge machining.   2. The low-temperature heat treatment for controlling the reaction temperature to a low temperature of 250 ° C. or lower after galvanizing the alloy body of all β (Beta) phases of the solid solution phase according to claim 1. Manufacturing method of electrode wire for electric discharge machining.   The reaction temperature for generating the η (Eta) phase from the solid solution phase alloy body of all β (Beta) phases and the galvanized layer is controlled to 420 ° C. or less, and the reaction temperature for generating the ε (Epsilon) phase is 600. 2. The method for producing an electrode wire for electric discharge machining according to claim 1, wherein the reaction temperature is controlled to 835 ° C. or lower by controlling the reaction temperature to ℃ or lower and generating a γ (Gamma) phase.

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