WO2018211772A1 - ワイヤ放電加工用電極線 - Google Patents
ワイヤ放電加工用電極線 Download PDFInfo
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- WO2018211772A1 WO2018211772A1 PCT/JP2018/007678 JP2018007678W WO2018211772A1 WO 2018211772 A1 WO2018211772 A1 WO 2018211772A1 JP 2018007678 W JP2018007678 W JP 2018007678W WO 2018211772 A1 WO2018211772 A1 WO 2018211772A1
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- wire
- discharge machining
- electrode wire
- coating layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/042—Manufacture of coated wire or bars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/22—Making metal-coated products; Making products from two or more metals
- B21C23/24—Covering indefinite lengths of metal or non-metal material with a metal coating
- B21C23/26—Applying metal coats to cables, e.g. to insulated electric cables
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/22—Electrodes specially adapted therefor or their manufacture
- B23H7/24—Electrode material
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
- C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0607—Wires
Definitions
- the present invention relates to an electrode wire for wire electric discharge machining.
- This application claims priority based on Japanese Patent Application No. 2017-097092 filed on May 16, 2017, and incorporates all the description content described in the above Japanese application.
- Electrode wire for wire electric discharge machining a voltage is applied between a workpiece immersed in a liquid and an electrode wire, and the workpiece is melted by heat generated by electric discharge, whereby the workpiece is machined.
- electrode wire for wire electric discharge machining one having a coating layer made of a copper-zinc alloy (Cu-Zn alloy) formed on the surface of a core wire portion made of steel is known. (For example, see Patent Document 1).
- An electrode wire for wire electric discharge machining covers a core wire portion made of steel and an outer peripheral side of the core wire portion, is made of a copper-zinc alloy, and is disposed so as to include the surface of the electrode wire for wire electric discharge machining.
- a coating layer consists of a gamma phase single phase.
- the surface roughness Ra in the circumferential direction of the coating layer is 0.08 ⁇ m or less.
- the surface roughness Ra in the longitudinal direction of the coating layer is 0.08 ⁇ m or less.
- an object of the present invention is to provide an electrode wire for wire electric discharge machining that can achieve both high speed machining and high machining accuracy.
- the electrode wire for wire electric discharge machining it is possible to provide an electrode wire for wire electric discharge machining that enables both high speed machining and high machining accuracy.
- the electrode wire for wire electric discharge machining of the present application includes a core wire portion made of steel, a coating layer that covers the outer peripheral side of the core wire portion, is made of a copper-zinc alloy, and is arranged to include the surface of the electrode wire for wire electric discharge machining. .
- a coating layer consists of a gamma phase single phase.
- the surface roughness Ra in the circumferential direction of the coating layer is 0.08 ⁇ m or less.
- the surface roughness Ra in the longitudinal direction of the coating layer is 0.08 ⁇ m or less.
- the coating layer of the electrode wire for wire electric discharge machining of the present application is made of a ⁇ phase single phase copper-zinc alloy.
- the coating layer is made of a ⁇ -phase single-phase copper-zinc alloy, the roughness in the circumferential direction may increase and the processing accuracy may be lowered.
- the surface roughness Ra in the circumferential direction is set to 0.08 ⁇ m or less, thereby suppressing a reduction in machining accuracy.
- the coating layer is made of a ⁇ -phase single-phase copper-zinc alloy
- cracks extending in the circumferential direction are likely to occur. This crack may increase the roughness in the longitudinal direction and lower the electrical conductivity.
- the coating layer is made of a ⁇ -phase single-phase copper-zinc alloy
- the roughness in the longitudinal direction increases as in the circumferential direction, which may reduce the processing accuracy.
- the surface roughness Ra in the longitudinal direction is set to 0.08 ⁇ m or less, thereby suppressing the decrease in conductivity and the decrease in processing accuracy.
- both high speed machining and high machining accuracy can be achieved.
- the surface roughness Rz in the longitudinal direction of the coating layer may be 0.50 ⁇ m or less.
- the crystal grains in the surface layer region which is the region including the surface of the coating layer, may have a shape that is longer in the longitudinal direction than the radial direction of the electrode wire for wire electric discharge machining. By doing so, the surface roughness in the circumferential direction of the electrode wire is reduced. Further, cracks extending in the circumferential direction of the electrode wire are suppressed, the surface roughness in the longitudinal direction is reduced, and sufficient electrical conductivity can be ensured.
- the crystal grain in the surface layer region has a larger ratio of the length in the longitudinal direction to the radial direction than the crystal grain in the inner region located on the inner peripheral side of the surface layer region. Also good. By doing so, the surface roughness in the circumferential direction of the electrode wire is reduced. Further, cracks extending in the circumferential direction of the electrode wire are suppressed, the surface roughness in the longitudinal direction is reduced, and sufficient electrical conductivity can be ensured.
- the roundness of the outer periphery in a cross section perpendicular to the longitudinal direction may be 0.25 ⁇ m or less.
- the number of cracks on the surface of the electrode wire for wire electric discharge machining in the longitudinal direction of 100 ⁇ m of the electrode wire for wire electric discharge machining may be 10 or less. By doing in this way, it becomes easy to ensure sufficient electrical conductivity.
- the electrical conductivity of the electrode wire for wire electric discharge machining may be 8% IACS (International Annealed Copper Standard) or more and 20% IACS or less. By doing in this way, appropriate electroconductivity can be provided to the electrode wire for wire electrical discharge machining.
- the surface hardness may be 300 HV or more and 600 HV or less. By doing in this way, sufficient intensity
- the surface hardness can be measured by, for example, a hardness measuring instrument (DUH-211) manufactured by Shimadzu Corporation.
- the copper content of the copper-zinc alloy constituting the coating layer may be 60% by mass or more and 75% by mass or less. By doing so, it becomes easy to make the coating layer of a ⁇ phase single phase copper-zinc alloy.
- an electrode wire 1 which is an electrode wire for wire electric discharge machining in the present embodiment covers a core wire portion 10 made of steel and an outer peripheral side of the core wire portion 10 and is made of a copper-zinc alloy, A covering layer 20 arranged to include the surface 21 of the wire 1.
- the steel constituting the core wire portion 10 includes, for example, 0.6 mass% or more and 1.1 mass% or less of carbon.
- regulated to JIS specification G3502 can be employ
- the steel constituting the core wire portion 10 has a uniform pearlite structure over the entire region.
- the copper-zinc alloy constituting the coating layer 20 contains, for example, 60% by mass or more and 75% by mass or less of zinc.
- the covering layer 20 is composed of a single ⁇ phase.
- the copper-zinc alloy constituting the coating layer 20 is composed of a single ⁇ phase.
- the copper-zinc alloy constituting the coating layer 20 is one or more selected from the group consisting of silver (Ag), gold (Au), aluminum (Al), cadmium (Cd) and mercury (Hg) as additive elements. It may contain an element.
- the thickness of the coating layer 20 is, for example, 1 ⁇ m or more and 8 ⁇ m or less.
- the surface roughness Ra in the circumferential direction of the coating layer 20 (the direction along the arrow ⁇ ) is 0.08 ⁇ m or less.
- the surface roughness Ra in the longitudinal direction of the coating layer 20 (the direction along the arrow ⁇ ) is 0.08 ⁇ m or less.
- the coating layer 20 of the electrode wire 1 of the present embodiment is made of a ⁇ -phase single-phase copper-zinc alloy. Thereby, high-speed machining is possible. Moreover, in the coating layer 20, since the surface roughness Ra in the circumferential direction is set to 0.08 ⁇ m or less, a decrease in processing accuracy is suppressed. Furthermore, in the coating layer 20, when the surface roughness Ra in the longitudinal direction is 0.08 ⁇ m or less, a decrease in electrical conductivity is suppressed and a decrease in processing accuracy is suppressed. As a result, the electrode wire 1 is an electrode wire for wire electric discharge machining that can achieve both high speed machining and high machining accuracy.
- FIG. 2 shows the state of the metal structure (microstructure) in the vicinity of the surface of the electrode wire 1 (the coating layer 20) in the cross section along the longitudinal direction of the electrode wire 1 (the direction along the arrow ⁇ in FIG. 1).
- FIG. 3 shows the state of the metal structure (microstructure) in the vicinity of the surface of the electrode line 1 (the coating layer 20) in a cross section perpendicular to the longitudinal direction of the electrode line 1 (the direction along the arrow ⁇ in FIG. 1).
- the covering layer 20 covering the core wire portion 10 so as to be in contact with the surface 11 of the core wire portion 10 includes a surface layer region 28 that is a region including the surface 21, and an inner circumference than the surface layer region 28. And an inner region 29 that is located on the side and is in contact with the surface 11 of the core wire portion 10.
- Each of the surface layer region 28 and the inner region 29 has a polycrystalline structure including a plurality of (many) crystal grains 25A and 25B.
- crystal grains 25 ⁇ / b> A in surface layer region 28 have a shape that is longer in the longitudinal direction (direction along arrow ⁇ ) than in the radial direction of electrode wire 1.
- the crystal grain 25 ⁇ / b> A in the surface region 28 has a larger ratio of the length in the longitudinal direction to the radial direction than the crystal grain 25 ⁇ / b> B in the inner region 29.
- the surface roughness in the circumferential direction is reduced in the electrode wire 1 of the present embodiment.
- the crack 31 extending in the circumferential direction is suppressed, the surface roughness in the longitudinal direction is reduced, and sufficient electrical conductivity can be ensured.
- the number of cracks 31 on the surface 21 of the electrode wire 1 in the range of 100 ⁇ m in the longitudinal direction of the electrode wire 1 is 10 or less.
- the number of cracks 31 can be investigated, for example, by cutting the electrode wire 1 with a cross section along the longitudinal direction and observing the cut surface with a microscope.
- the number of cracks 31 in the range of 100 ⁇ m in the longitudinal direction can be determined by observing a plurality of, for example, five places in the longitudinal direction of the electrode wire 1 at five places.
- the number of cracks 31 on the surface 21 of the electrode wire 1 in the longitudinal direction of the electrode wire 1 in the range of 100 ⁇ m is preferably 5 or less, and the cracks 31 are observed when observation is made at 0, for example, five locations. More preferably not.
- the surface roughness Ra in the circumferential direction of the coating layer 20 is preferably 0.06 ⁇ m or less, and more preferably 0.04 ⁇ m or less. By doing so, the processing accuracy is further improved.
- the surface roughness Rz in the longitudinal direction of the coating layer 20 is preferably 0.50 ⁇ m or less, more preferably 0.30 ⁇ m or less, and even more preferably 0.20 ⁇ m or less. preferable.
- the surface roughness Ra in the longitudinal direction of the coating layer 20 is preferably 0.06 ⁇ m or less, and more preferably 0.04 ⁇ m or less.
- the surface roughness Ra and the surface roughness Rz mean the surface roughness specified in JIS standard B0601. Moreover, in this application, the surface roughness of the circumferential direction shall be measured by making reference
- the roundness of the outer periphery in the cross section perpendicular to the longitudinal direction is preferably 0.25 ⁇ m or less. By doing in this way, processing accuracy can be improved further.
- the roundness is more preferably 0.15 ⁇ m or less, and further preferably 0.10 ⁇ m or less.
- the roundness means a difference in radius between a circumscribed circle and an inscribed circle with respect to the outer shape of the surface 21 in a cross section perpendicular to the longitudinal direction of the electrode line 1.
- the conductivity of the electrode wire 1 of the present embodiment is preferably 8% IACS or more and 20% IACS or less. Thereby, appropriate electroconductivity can be provided to the electrode wire 1.
- the conductivity of the electrode wire 1 is more preferably 9% IACS or more.
- the surface hardness of the electrode wire 1 according to the present embodiment is preferably 300 HV or more and 600 HV or less. Thereby, sufficient intensity
- the surface hardness of the electrode wire 1 is more preferably 400 HV or higher.
- the surface hardness of the electrode wire 1 is more preferably 500 HV or less.
- the tensile strength of the electrode wire 1 is preferably 1800 MPa or more and 3200 MPa or less. Thereby, disconnection in wire electric discharge machining is suppressed.
- the tensile strength of the electrode wire 1 is more preferably set to 2000 MPa or more and 3000 MPa or less.
- the wire diameter of the electrode wire 1 is preferably 20 ⁇ m or more and 200 ⁇ m or less. By setting the wire diameter to 20 ⁇ m or more, it becomes easy to ensure sufficient strength. By making the wire diameter 200 ⁇ m or less, precise processing becomes easy.
- the area ratio of the coating layer 20 is preferably 10% or more and 45% or less. Thereby, it becomes easy to obtain desired conductivity and discharge property while securing sufficient tensile strength.
- a raw steel wire preparation step is first performed as a step (S10).
- this step (S10) for example, a steel wire made of a piano wire defined in JIS standard G3502 is prepared.
- a raw steel wire 50 having an appropriate wire diameter is prepared in consideration of the wire diameter of the desired electrode wire 1.
- the cross section perpendicular to the longitudinal direction of the raw steel wire 50 is circular.
- the raw steel wire 50 is prepared by a process including a rolling process and a wire drawing process, for example.
- a wire drawing step is performed as a step (S20).
- the raw steel wire 50 prepared in the step (S10) is drawn (drawn).
- the wire diameter of the raw material steel wire 50 is adjusted so that it may become the wire diameter of the core part 10 of the desired electrode wire 1 after the process (S60) mentioned later is implemented.
- FIG. In the patenting treatment the raw steel wire 50 is heated to a temperature range equal to or higher than the austenitizing temperature (A 1 point temperature), and then rapidly cooled to a temperature range higher than the martensite transformation start temperature (M s point temperature). Can be implemented by holding in the area. Thereby, the steel structure of the raw steel wire 50 becomes a fine pearlite structure with a small lamella interval.
- a Cu layer forming step is performed as a step (S30).
- a copper layer (Cu layer) is formed on the surface of the raw steel wire 50 on which the step (S20) has been performed.
- copper layer 52 is formed so as to cover surface 51 of raw steel wire 50.
- the copper layer 52 can be formed by plating, for example.
- a Zn layer forming step is performed as a step (S40).
- a zinc layer (Zn layer) is formed on the surface of the raw steel wire 50 on which the step (S30) has been performed.
- zinc layer 54 is formed so as to cover surface 53 of copper layer 52 formed on surface 51 of raw steel wire 50.
- the zinc layer 54 can be formed by plating, for example.
- the thickness of the copper layer 52 and the zinc layer 54 formed in the steps (S30) and (S40) can be determined in consideration of the desired component composition of the copper-zinc alloy constituting the coating layer 20. Further, the order of forming the copper layer 52 and the zinc layer 54 is not limited to the above order, and the copper layer 52 may be formed after the zinc layer 54 is formed.
- a first heat treatment step is performed as a step (S50).
- an alloying process is performed on the copper layer 52 and the zinc layer 54 formed in the steps (S30) and (S40).
- a heat treatment is performed on the raw steel wire 50 having the copper layer 52 and the zinc layer 54, for example, by heating to a temperature range of 200 ° C. or more and 500 ° C. or less and holding for 1 hour or more and 6 hours or less.
- the 6 and 7, the copper layer 52 and the zinc layer 54 are alloyed to obtain a coating layer 56 made of a copper-zinc alloy composed of a single ⁇ phase.
- a smoothing and drawing step is performed as a step (S60).
- a wire drawing process smoothing wire drawing process for the purpose of smoothing the surface is performed on the raw steel wire 50 on which the coating layer 56 is formed so as to cover the surface 51.
- wire drawing with a low area reduction rate of 1% to 5% is performed on the raw steel wire 50 on which the coating layer 56 is formed.
- a second heat treatment step is performed as a step (S70).
- the coating layer 56 drawn in step (S60) is heated to a temperature of, for example, 200 ° C. or higher and 500 ° C. or lower and held for 1 hour or longer and 6 hours or shorter. Is done.
- covers the surface 11 of the core wire part 10 is obtained.
- the raw steel wire 50 and the coating layer 56 correspond to the core wire portion 10 and the coating layer 20 of the electrode wire 1, respectively.
- the coating layer 56 (coating layer 20) made of a single ⁇ phase is formed by the heat treatment in the step (S50). Due to the formation of the coating layer 56 (coating layer 20) composed of a single ⁇ phase, the unevenness of the surface 21 of the electrode wire 1 becomes large, and if no measures are taken, there arises a problem that the processing accuracy decreases.
- a smoothing and drawing step is performed in step (S60).
- the crystal grains 25A in the surface layer region 28 are compressed in the radial direction of the electrode wire 1 and stretched along the longitudinal direction, thereby achieving smoothing.
- the ⁇ phase is brittle, when the area reduction rate in the wire drawing process exceeds 5%, a large number of cracks 31 extending in the circumferential direction are formed.
- the surface roughness in the circumferential direction becomes small, the surface roughness in the longitudinal direction becomes large due to the influence of the cracks 31, and the electrical conductivity also decreases.
- the area reduction rate to 5% or less, the surface roughness of the surface 21 can be reduced while suppressing the formation of the cracks 31.
- the area reduction rate is set to 1% or more, contact between the coating layer 56 (coating layer 20) and the die is more reliably ensured at the time of wire drawing, and the surface roughness in the circumferential direction is more reliably ensured. Can be reduced.
- a second heat treatment step is performed as a step (S70).
- this step (S70) is not an indispensable step, even if the crack 31 is formed in the step (S60) by carrying out this step, a part or all of the crack 31 is repaired by the diffusion of atoms, and the crack 31 is further reduced.
- the manufacturing method of the electrode wire 1 of the present embodiment it is possible to manufacture the electrode wire 1 that enables both high speed processing and high processing accuracy.
- the wire drawing step is performed as the step (S20) before the Cu layer forming step and the Zn layer forming step.
- the wire drawing step includes the Cu layer forming step and the Zn layer forming step. It may be performed after the layer forming step and before the first heat treatment step.
- sample A in which steps (S10) to (S50) were performed in the method for manufacturing electrode wire 1 of the above embodiment was prepared.
- sample B a sample (sample B) subjected to a smoothing and drawing process with a surface reduction rate of 1%
- sample C a sample subjected to a smoothing and drawing process with a surface reduction rate of 4% were prepared.
- Samples A to C were cut along a cross section perpendicular to the longitudinal direction, and an experiment was conducted to investigate the outer shape of the cut surface.
- the smoothing wire drawing process was implemented with respect to the sample A at various surface reduction rates, and the experiment which measures the electrical conductivity of the obtained electrode wire was conducted.
- FIG. 8 is schematic views showing the outer shapes of samples A, B, and C, respectively.
- FIG. 11 is a figure which shows the relationship between the area reduction rate in a smoothing wire drawing process, and the electrical conductivity of the obtained electrode wire.
- the unevenness in the circumferential direction is improved by performing a smoothing and drawing process with a surface reduction rate of 1%. Furthermore, with reference to FIGS. 9 and 10, the unevenness in the circumferential direction is further improved by performing a smoothing and drawing process with a surface reduction rate of 4%. As described above, the unevenness in the circumferential direction can be effectively improved even in the wire drawing with a small area reduction rate of 5% or less.
- the electrode wire for wire electric discharge machining of this application is not restricted to this.
- a copper layer made of pure copper may be disposed between the coating layer 20 and the core wire portion 10 for the purpose of improving electrical conductivity.
- a nickel (Ni) layer may be disposed between the copper layer and the coating layer 20 as a block layer that inhibits the diffusion of zinc.
- Electrode wire 10 Core wire part 11 Surface 20 Cover layer 21 Surface 25A, 25B Crystal grain 28 Surface layer region 29 Internal region 31 Crack 50 Raw material steel wire 51 Surface 52 Copper layer 53 Surface 54 Zinc layer 56 Cover layer
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Abstract
Description
本出願は、2017年5月16日出願の日本出願第2017-097092号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。
[本開示の効果]
最初に本願発明の実施態様を列記して説明する。本願のワイヤ放電加工用電極線は、鋼からなる芯線部と、芯線部の外周側を覆い、銅-亜鉛合金からなり、ワイヤ放電加工用電極線の表面を含むように配置される被覆層と、を備える。被覆層は、γ相単相からなる。
被覆層の周方向における表面粗さRaは0.08μm以下である。被覆層の長手方向における表面粗さRaは0.08μm以下である。
表面硬度は、たとえば株式会社島津製作所製の硬度測定器(DUH-211)により測定することができる。
次に、本発明にかかるワイヤ放電加工用電極線の実施の形態を、以下に図面を参照しつつ説明する。なお、以下の図面において同一または相当する部分には同一の参照番号を付しその説明は繰返さない。
銅層52は、たとえばめっきにより形成することができる。
10 芯線部
11 表面
20 被覆層
21 表面
25A,25B 結晶粒
28 表層領域
29 内部領域
31 クラック
50 原料鋼線
51 表面
52 銅層
53 表面
54 亜鉛層
56 被覆層
Claims (9)
- ワイヤ放電加工用電極線であって、
鋼からなる芯線部と、
前記芯線部の外周側を覆い、銅-亜鉛合金からなり、前記ワイヤ放電加工用電極線の表面を含むように配置される被覆層と、を備え、
前記被覆層は、γ相単相からなり、
前記被覆層の周方向における表面粗さRaは0.08μm以下であり、
前記被覆層の長手方向における表面粗さRaは0.08μm以下である、ワイヤ放電加工用電極線。 - 前記被覆層の長手方向における表面粗さRzは0.50μm以下である、請求項1に記載のワイヤ放電加工用電極線。
- 前記被覆層の表面を含む領域である表層領域における結晶粒は、前記ワイヤ放電加工用電極線の径方向に比べて長手方向に長い形状を有する、請求項1または請求項2に記載のワイヤ放電加工用電極線。
- 前記表層領域における結晶粒は、前記表層領域よりも内周側に位置する内部領域における結晶粒に比べて、径方向に対する長手方向の長さの比が大きい、請求項3に記載のワイヤ放電加工用電極線。
- 長手方向に垂直な断面における外周の真円度が0.25μm以下である、請求項1~請求項4のいずれか1項に記載のワイヤ放電加工用電極線。
- 前記ワイヤ放電加工用電極線の長手方向100μmの範囲の前記ワイヤ放電加工用電極線の表面におけるクラックの数は10個以下である、請求項1~請求項5のいずれか1項に記載のワイヤ放電加工用電極線。
- 導電率が8%IACS以上20%IACS以下である、請求項1~請求項6のいずれか1項に記載のワイヤ放電加工用電極線。
- 表面硬度が300HV以上600HV以下である、請求項1~請求項7のいずれか1項に記載のワイヤ放電加工用電極線。
- 前記被覆層を構成する銅-亜鉛合金の亜鉛含有量は60質量%以上75質量%以下である、請求項1~請求項8のいずれか1項に記載のワイヤ放電加工用電極線。
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JP2015071221A (ja) | 2013-09-09 | 2015-04-16 | 住友電工スチールワイヤー株式会社 | ワイヤ放電加工用電極線 |
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JP2001052528A (ja) * | 1999-08-06 | 2001-02-23 | Furukawa Electric Co Ltd:The | 高導電性ワイヤ放電加工用電極線 |
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JP2017097092A (ja) | 2015-11-20 | 2017-06-01 | 株式会社Jvcケンウッド | 端末装置、通信方法 |
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