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WO2008010263A1 - Procédé de production d'une électrode pour le traitement de surface par décharge et procédé de traitement de surface par décharge - Google Patents

Procédé de production d'une électrode pour le traitement de surface par décharge et procédé de traitement de surface par décharge Download PDF

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Publication number
WO2008010263A1
WO2008010263A1 PCT/JP2006/314189 JP2006314189W WO2008010263A1 WO 2008010263 A1 WO2008010263 A1 WO 2008010263A1 JP 2006314189 W JP2006314189 W JP 2006314189W WO 2008010263 A1 WO2008010263 A1 WO 2008010263A1
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WO
WIPO (PCT)
Prior art keywords
electrode
powder
surface treatment
discharge surface
discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/314189
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English (en)
Japanese (ja)
Inventor
Akihiro Goto
Hiroyuki Teramoto
Kazushi Nakamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Mitsubishi Electric Corp
Original Assignee
IHI Corp
Mitsubishi Electric Corp
Ishikawajima Harima Heavy Industries Co Ltd
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Filing date
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Application filed by IHI Corp, Mitsubishi Electric Corp, Ishikawajima Harima Heavy Industries Co Ltd filed Critical IHI Corp
Priority to PCT/JP2006/314189 priority Critical patent/WO2008010263A1/fr
Publication of WO2008010263A1 publication Critical patent/WO2008010263A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00

Definitions

  • Discharge surface treatment electrode manufacturing method and discharge surface treatment method are Discharge surface treatment electrode manufacturing method and discharge surface treatment method
  • the present invention uses a molded powder formed of a metal powder, a metal compound powder, or a conductive ceramic powder as an electrode, and a pulse shape between the electrode and the workpiece in the working fluid or in the air.
  • the discharge surface treatment method is used to form a film having the material force of the electrode on the workpiece surface or the film having the material force by reacting the electrode material by the energy of the pulsed discharge.
  • the present invention relates to a method for producing a discharge surface treatment electrode.
  • Patent Document 1 a metal material that does not form carbide or is difficult to form as an electrode material is mixed with a wax that is a binder, and this is put into a mold, and a predetermined press pressure is applied. By punching with, a compression-molded electrode is manufactured.
  • Patent Document 1 International Publication No. 2004Z011696 Pamphlet
  • the present invention has been made in view of the above, and is capable of manufacturing a discharge surface treatment electrode having a complicated shape at low cost without performing post-processing. It is an object of the present invention to obtain a method and a discharge surface treatment method using an electrode produced by the production method.
  • a method for producing an electrode for discharge surface treatment comprises a metal powder, a metal compound powder, or a ceramic powder.
  • a pulsed discharge is generated between the electrode and the workpiece in the machining fluid or in the air, and the energy of the coating or electrode material consisting of the electrode material on the workpiece surface is generated by the energy.
  • the method for producing an electrode for discharge surface treatment according to the present invention can strengthen the bonding between the electrode powders, so that the efficiency can be easily achieved without post-processing a small electrode for discharge surface treatment having a complicated shape. There is an effect that it can be manufactured well. In addition, since the electrode for discharge surface treatment can be manufactured without post-processing, the cost for post-processing is increased, and the electrode material for post-processing is not wasted, so that the electrode for discharge surface treatment can be manufactured at low cost. There is an effect that it can be.
  • FIG. 1 is a diagram for explaining a method for manufacturing an electrode for discharge surface treatment according to a first embodiment of the present invention.
  • FIG. 2-1 is a diagram for explaining a method of manufacturing the electrode for discharge surface treatment according to the first embodiment of the present invention.
  • FIG. 2-2 is a diagram for explaining a method of manufacturing the electrode for discharge surface treatment according to the first embodiment of the present invention.
  • FIGS. 2-3 are diagrams for explaining a method of manufacturing the electrode for discharge surface treatment according to the first embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing a schematic configuration of a discharge surface treatment apparatus that performs a discharge surface treatment in Embodiment 1 of the present invention.
  • FIG. 41 is a diagram showing an example of a discharge pulse condition during discharge surface treatment, and a diagram showing a voltage waveform applied between an electrode and a workpiece during discharge.
  • FIG. 42 is a diagram showing an example of the pulse condition of the discharge during the discharge surface treatment, and is a diagram showing the current waveform of the current flowing during the discharge.
  • FIG. 5 is a diagram showing an example of discharge pulse conditions during discharge surface treatment.
  • FIG. 6 is an image showing an example of a state of a cross section when a titanium carbide (TiC) film is formed on a workpiece having a steel material force.
  • TiC titanium carbide
  • FIG. 7 is a characteristic diagram showing the relationship between the thickness of the fusion layer and the adhesion of the coating.
  • FIG. 8 is a characteristic diagram showing the relationship between the thickness of the fusion layer and the deformation amount of the base material.
  • FIG. 9 is an image showing an example of a cross-sectional state when a cobalt (Co) alloy film is formed on a workpiece having a steel material force, which is a workpiece.
  • FIG. 10 is a diagram for explaining the principle of an extrusion molding machine, and is a schematic diagram showing a part of the extrusion molding machine as a cross-sectional view.
  • FIG. 1 and FIG. 2-1 to FIGS. 2 to 3 are diagrams for explaining a method for manufacturing an electrode for discharge surface treatment according to the first embodiment of the present invention.
  • the method for producing an electrode for discharge surface treatment according to the first embodiment uses a metal powder, a metal compound powder, or a molded powder obtained by molding a conductive ceramic powder as an electrode in a working fluid or in the air. ! A pulsed discharge is generated between the electrode and the workpiece, and the coating of the electrode material on the surface of the workpiece or the coating of the material that reacts the electrode material with the energy of the pulsed discharge is generated by the energy. It is a manufacturing method of the electrode for discharge surface treatment used for the discharge surface treatment method which forms.
  • a method for producing a discharge surface treatment electrode used in this embodiment for such a discharge surface treatment method is to mix a powder as an electrode material and a binder to produce a plastic mixture, A compression molded body is formed by press-fitting this mixture into a mold made of a split mold having a predetermined shape using a nozzle, and a heat treatment is performed to obtain an electrode for discharge surface treatment.
  • a method for producing a discharge surface treatment electrode used in this embodiment for such a discharge surface treatment method is to mix a powder as an electrode material and a binder to produce a plastic mixture, A compression molded body is formed by press-fitting this mixture into a mold made of a split mold having a predetermined shape using a nozzle, and a heat treatment is performed to obtain an electrode for discharge surface treatment.
  • each step of manufacturing the above-described electrode for discharge surface treatment will be described in detail with reference to FIG. 1 and FIGS. 2-1 to 2-3.
  • the electrode powder includes titanium carbide (TiC) powder with a particle size of about 3 ⁇ m and titanium hydride (TiH) powder with a particle size of about 10 ⁇ m.
  • the powder at the end is brittle, it has a particle size of about 10 m or less and is pulverized in the process of mixing the powder to a particle size less than that of titanium carbide (TiC) powder.
  • TiC titanium carbide
  • the binder to be mixed with the electrode powder a mixture of norafine wax and polyethylene in a volume ratio of about 1: 1 was used.
  • the mixing of the electrode powder and the binder was performed by adding the electrode powder and the binder in a volume ratio of about 1: 1, and kneading continuously for about several hours to about 20 hours with a single binder.
  • the kneading first, paraffin wax and polyethylene are heated to a temperature of about 150 ° C. to 200 ° C. to be in a molten state, and then the electrode powder is taken for about 10 minutes to 30 minutes. Gradually added.
  • a surfactant such as stearic acid was added to the binder at about several percent of the weight of the powder, the effect of preventing aggregation of the electrode powder was obtained. In this way, a mixture 102 of electrode powder and binder is produced.
  • a green compact compression molded body
  • the mixture 102 was introduced into a molding machine (not shown). Then, it is introduced into a nozzle 202 connected to a molding machine as shown in FIG. 2-1, and using this nozzle 202, a mixture 102 is molded as a mold having a split mold as shown in FIG. Press fit into 201. At the time of press-fitting, the mixture 102 is press-fitted into the mold 201 by pressing the mixture 102 into the mold 201 at about 50 MPa to 200 MPa.
  • the mixture 102 press-fitted into the mold 201 is cooled for a period of several tens of seconds to several tens of minutes while the pressure is applied in the mold 201.
  • the noinda is gelled and is less likely to collapse and can be taken out from the mold 201 as a molded body.
  • the mold 201 was disassembled and the green compact (compression molded body) 203 was taken out.
  • This green compact (compression molded body) 203 is a source of the electrode for discharge surface treatment. For the following reasons, it can be used as an electrode for discharge surface treatment as it is. There is no.
  • the green compact (compression molded body) 203 is heat-treated, and the green compact (compression molded body) 203 is removed.
  • a heat treatment step is performed to make the electrode ready for use as a discharge surface treatment electrode.
  • the heat treatment step in the present embodiment is a discharge surface treatment that does not increase the density of the molded body by melting the powder as in sintering in general metal injection molding!
  • the purpose is to achieve a state in which the bonding at the portion where the electrode powders are in contact with each other becomes stronger with the electrode powder shape remaining as it is.
  • This heat treatment removes the paraffin wax while raising the temperature of the green compact (compressed compact) 203 in a vacuum furnace over a period of about 2 hours from 100 ° C to 300 ° C. To do.
  • the polyethylene is removed while the temperature of the green compact (compression molded body) 203 is raised from 400 ° C to 500 ° C over about 1 hour.
  • titanium hydride (TiH 3) releases hydrogen to become titanium (Ti).
  • the titanium (Ti) serves as a binder (binding material) and serves to bond the electrode powders together.
  • Binders such as polyethylene play a role of connecting powders and powders before heating, and titanium (Ti) is carbonized after binders such as polyethylene are lost. It plays a role in connecting hard powders such as titanium (TiC).
  • the temperature of the green compact (compression molded body) 203 was further raised and held at a temperature in the range of 900 ° C to 1100 ° C for 1 hour to 2 hours, and then the heater of the vacuum furnace was turned off. Natural cooling was carried out in the vacuum furnace to prevent oxidation.
  • the heat treatment temperature described above varies depending on various conditions such as the state of the electrode powder and the pressure of compression molding. If the density of the green compact (compression compact) 203 (the density calculated from the volume and weight of the compact (compression compact) 203 including the space) is high, a lower temperature is the appropriate heat treatment temperature. Thus, when this density was low, it was confirmed that a higher temperature tends to be an appropriate heat treatment temperature. This is because when the density is high, the electrode powders are in close contact with each other, and the bonding state between the powders tends to be strong even at a low temperature where the contact area between the electrode powders is large.
  • Patent Document 1 As shown in Patent Document 1, conventionally, an electrode material is often compression-molded by a press. However, the following effects can be obtained by performing compression molding by press-fitting an electrode material into a mold as shown in the present embodiment.
  • the press-fitting pressure is controlled without being aware of the amount of the electrode material. Since the electrode corresponding to the mold shape is compression-molded with a predetermined hardness, it is easy to mold the electrode.
  • TiC titanium carbide
  • TiH titanium hydride
  • the binder component is not limited to paraffin wax or polyethylene. good.
  • a thermoplastic resin such as polypropylene or acrylic resin, or a protein material such as agar may be used as long as it exhibits a reversible reaction of sol-gel.
  • Agar and the like may be water-soluble substances such as water-soluble substances.
  • electrode powder is not limited to this. Instead of titanium hydride (TiH),
  • a metal such as cobalt (Co), nickel (Ni), or iron (Fe) may be used.
  • the metal has a lower formability than these metals.
  • Other metals such as tungsten (W), molybdenum (Mo), and chromium (Cr) may be used.
  • carbide ceramics such as tungsten carbide (WC), chromium carbide, vanadium carbide, molybdenum carbide, niobium carbide, silicon carbide, etc. can be used. Titanium nitride (TiN), titanium boride (TiB), or the like may be used.
  • the metal to be mixed has conductivity, and it may be mixed in such a ratio that conductivity can be obtained when it becomes an electrode.
  • a single metal or a mixed metal may be used.
  • ceramics other than carbide ceramics when used for discharge surface treatment in oil, are components in which the carbide in the coating is not the electrode material itself.
  • the film thickness is about 5 m to 30 m when a dense film is formed. When a film thicker than this can be formed, the film is in a porous state.
  • the formed film contains about 30% or more of a metal component that does not become carbide.
  • a metal component that does not become carbide For this purpose, no carbide is formed or It is preferable that a metal material that is difficult to form, such as cobalt (Co), nickel (Ni), iron (Fe), etc., is contained in the electrode material at a volume ratio of about 40% or more.
  • chromium (Cr), tungsten (W), molybdenum (Mo), etc. are materials that form carbides. Chromium (Cr), tungsten (W), which does not completely become carbides in force discharge surface treatment Since the amount of molybdenum (Mo) metal remains in the coating is large, it is a material that can form a dense thick film.
  • Ease of formation of carbide by the material can be easily known from an Ellingham diagram or the like.
  • the particle size of the powder is 1
  • the electrode is formed with fine particles of about m or less, the electrode can be broken and melted under relatively small discharge conditions, so that a dense thick film can be formed.
  • the particle diameter of the electrode material will be described.
  • the electrode powder a force using titanium carbide (TiC) powder having a particle size of about 3 m and titanium hydride (TiH) powder having a particle size of about 10 m is shown below. There is a good reason.
  • TiC titanium carbide
  • TiH titanium hydride
  • the first boundary is around a particle size of 10 ⁇ m.
  • the particle size is about 10 ⁇ m or more, it becomes difficult to generate a stable discharge, and the formation of the coating itself becomes difficult. Therefore, by setting the particle size to about 10 m or less, it is possible to produce a discharge surface treatment electrode that can generate a discharge reliably and stably.
  • the second boundary is in the vicinity of 3 ⁇ m.
  • the particle size is about 3 m or less, it is easy to produce a uniformly compressed shaped body. If the electrodes cannot be compressed uniformly, the coating cannot be formed uniformly due to the difference in the density or hardness of the electrodes. Therefore, in order to form a uniform film, the average particle size must be about 3 ⁇ m or less. However, it is effective in the case of increasing the density of the electrode that a part of the electrode is mixed with a powder having a reasonably large particle size that may be mixed with a powder larger than about 3 m. is there.
  • the third boundary is around a particle size of 1 ⁇ m.
  • the particle size of the powder In order to form a coating, it is necessary to melt the electrode material powder. The larger the particle size of the powder, the greater the energy of the discharge pulse required to melt the powder. However, when the energy of the pulse discharge increases, the unit of the material to which the electrode force is supplied increases, resulting in a problem that voids increase in the film. For this reason, in order to form a dense film, it is preferable to melt a small powder with a discharge pulse of small energy, and for this purpose, the particle size is preferably about 1 ⁇ m or less.
  • the molding pressure is a force applied at a pressure of about 50 MPa to 200 MPa.
  • This pressure is not limited to this range because the range varies depending on the state of the mixture to be pressed. For example, a mixture of electrode powder and binder due to a small amount of binder, etc. When the viscosity of the coalescence is high, it is better to increase the pressure. For example, about 100 MPa to 300 MPa is an appropriate pressure.
  • the discharge surface treatment using the electrode manufactured by the method for manufacturing the electrode for discharge surface treatment according to the present embodiment will be described.
  • the electrode for discharge surface treatment in this embodiment can be used for processing of simple shaped parts and molds, it is mainly used for processing of complicated shaped parts having specific shapes and small parts. Is preferred.
  • a nodal discharge is generated between the electrode and the workpiece in an electrically insulating liquid or air, and heat is locally generated by the discharge energy.
  • the electrode material is transferred to the base material while melting the workpiece (base material) and the electrode material, thereby forming a coating film having strong adhesion without deformation of the parts.
  • FIG. 3 is a schematic diagram showing a schematic configuration of a discharge surface treatment apparatus that performs discharge surface treatment according to the present embodiment.
  • the discharge surface treatment apparatus according to the present embodiment includes an electrode 301 composed of the above-described titanium carbide (TiC) powder and titanium hydride (TiH) powder.
  • a machining fluid supply device (not shown) that immerses the oil as the machining fluid 303, the electrode 301 and the workpiece 302 in the machining fluid, or supplies the machining fluid 303 between the electrode 301 and the workpiece 302;
  • a discharge surface treatment power source 304 that generates a pulsed discharge (arc column 305) by applying a voltage between the electrode 301 and the workpiece 302 is provided.
  • the description of the other members directly related to the present invention such as a driving device for controlling the relative position between the discharge surface treatment power source 304 and the workpiece 302 is omitted.
  • the electrode 301 and the workpiece 302 are disposed opposite to each other in the force liquid 303 and the discharge surface treatment power supply 304 is placed in the machining liquid 303.
  • the force also generates a pulsed discharge between the electrode 301 and the workpiece 302.
  • a coating film of electrode material is formed on the surface of the workpiece by the discharge energy of the nodal discharge, and Forms a film of a substance in which the electrode material reacts with the discharge energy on the workpiece surface.
  • the polarity is negative on the electrode 301 side and positive on the workpiece 302 side.
  • a discharge arc column 305 is generated between the electrode 301 and the workpiece 302.
  • Figs. 41 and 42 show examples of discharge pulse conditions during discharge surface treatment
  • Fig.4-1 shows voltage waveforms applied between the electrode and workpiece during discharge
  • 42 shows the current waveform of the current that flows during discharge.
  • Time t2—tl is the pulse width te.
  • the voltage waveform at time t0 to t2 is repeatedly applied between both electrodes with a pause time to.
  • a pulsed voltage is applied between the discharge surface treatment electrode and the workpiece.
  • the electrical conditions of the discharge pulse during the discharge surface treatment are as shown in FIG.
  • the negative voltage of the electrode is shown on the horizontal axis (positive).
  • the electrode is broken by a current having a high peak waveform as shown in FIG. 8, and the melting is advanced by a current having a wide waveform having a low peak as shown in FIG.
  • the film can be formed on the workpiece 302 at a high speed.
  • a current value of about 10 A to 30 A is appropriate for the high peak waveform portion
  • a current value of about 2 A to 6 A for the current value of the wide waveform portion of the low peak width is the discharge duration (discharge pulse width). 4 / z 3-20 s was appropriate.
  • the current of the wide waveform part of the low peak is If it is lower than 2A, it will be difficult to continue the pulse of discharge, and the phenomenon of pulse cracking in which the current is interrupted will increase.
  • fusion layer (gradient structure layer) in which the structure of the material changes in an inclined manner at the boundary between the base material and the film as shown in FIG. .
  • Fig. 6 is an image showing an example of a cross-sectional state when a titanium carbide (TiC) film is formed on a work made of steel.
  • the A—A line is the approximate position of the workpiece (base material) surface before the titanium carbide (TiC) coating is formed.
  • the S—S line is the position on the workpiece surface after the titanium carbide (TiC) coating is formed.
  • the titanium carbide (TiC) coating is formed in region C between the S—S and B—B lines. Therefore, the fusion layer is the region between the A—A line and the B—B line.
  • curve I (Fe- ⁇ ⁇ ) shows the equivalent of iron content, and the higher this position, the greater the iron content.
  • the thickness of the fusion layer is determined by the magnitude of the pulse discharge energy in the discharge surface treatment, and the pulse discharge energy is thin when the pulse discharge energy is small. The energy of the pulse discharge is large. And it was amazing that it became thicker. If the thickness of the fusion layer is too thin, the adhesion of the coating will be weak, and if the energy of the pulse discharge is too great and the thickness of the fusion layer exceeds about 20 ⁇ m, the surface roughness of the coating will be reduced. It was found that the cracks were generated and many cracks were generated in the coating.
  • FIG. 7 shows the relationship between the thickness of the fusion layer and the adhesion of the coating.
  • Figure 8 shows the relationship between the thickness of the fusion layer and the deformation of the base metal.
  • the thickness force of the fusion layer which is a tilted structure, is less than m
  • the coating peels easily from the interface where the adhesion strength at the interface between the base material and the coating is weak.
  • the adhesion strength gradually increased, and when the thickness of the fusion layer exceeded 10 m, it was found that peeling at the interface was not observed.
  • the adhesion strength referred to here is, for example, a non-dimensional value obtained from a film tensile test.
  • the thickness of the fusion layer which is a tilted structure, is about 20 m to 30 m or more, the deformation of the base material suddenly increases. Therefore, in order not to cause a problem of deformation of the base material having a strong adhesion of the coating, it is necessary that the thickness of the fusion layer of the coating is in the range of several m to 30 ⁇ m.
  • the pulse condition for forming such a film requires a peak current value of 30 A or less and a pulse width of 200 s or less, more preferably a peak current value of 20 A or less and a pulse width. Is better than 20 ⁇ s. Under these conditions, the surface of the base material is melted to a thickness of about 20 ⁇ m, and as a result, the thickness of the fusion layer of the coating is in the range of several to 30 m.
  • peak current value is an average value of the peak current in the discharge pulse.
  • the force at which the current value of the rectangular waveform is the peak current value itself, as shown in Fig. 5, when there is a part with a high peak in the current waveform Is the average value of the current values during the time of the current pulse.
  • a high peak portion is provided in a part of the current waveform to form a coating film.
  • the formation performance may be improved. Specifically, when a high current is applied to the top of the current waveform, the electrode can be broken well, and as a result, the film formation rate can be increased. Therefore, for processing complex parts with small shapes, it is appropriate to apply a high current to the top, form a film under electrical conditions with a peak current value of 30 A or less and a pulse width of 200 ⁇ s or less! /
  • the electrode powders can be strongly bonded to each other, so that it is possible to provide a small discharge surface treatment electrode having a complicated shape. . Moreover, it is possible to easily and efficiently manufacture a small discharge surface treatment electrode having a complicated shape without performing post-processing.
  • the electrode for discharge surface treatment can be manufactured without performing post-treatment, there is no increase in cost due to post-processing, and electrode material by post-processing is not wasted, and the discharge surface treatment is not caused. Processing electrodes can be manufactured at low cost.
  • titanium carbide (TiC) powder and titanium hydride (TiH) powder are used.
  • the force carried describes the case of manufacturing a mixture by adding a binder consisting of Bruno "paraffin wax and polyethylene," chrome (Cr) 25 weight 0/0, nickel (Ni) 10 wt% of tungsten (W) 7% by weight, residual cobalt (Co) ”was dissolved in a metal and the electrode material with a particle size of about 1 ⁇ m of conoret (Co) alloy powder was used as a paraffin.
  • a binder in which wax and polyethylene were mixed at a volume ratio of about 1: 1 was prepared to produce a mixture, and an electrode for discharge surface treatment was produced.
  • the discharge surface treatment electrode according to the present embodiment is mixed, and the discharge surface treatment electrode is pressed into a mold except that the discharge surface treatment electrode is produced using the above mixture.
  • the process (pressing conditions) and the heating process conditions after compression molding are the same as in Embodiment 1 described above, and the electrical conditions and film characteristics in the discharge surface treatment using the manufactured electrodes are also the same. It is substantially the same.
  • FIG. 9 An example of a state of a cross section when a coating of a cobalt (Co) alloy is formed on a workpiece made of steel material, which is a workpiece, by discharge surface treatment using the discharge surface treatment electrode according to the present embodiment
  • a fusion layer in which the material changes in an inclined manner is formed at the boundary between the base material and the coating.
  • the EE line is the approximate position of the workpiece (base material) surface before the cobalt (Co) alloy film is formed.
  • the fusion layer is the region between the FF line and the GG line.
  • the thickness of the fusion layer is determined by the magnitude of the pulse discharge energy in the discharge surface treatment, and is thin when the pulse discharge energy is small, and the pulse discharge energy is large. And it was amazing that it became thicker. If the thickness of the fusion layer is too thin, the adhesion of the coating will be weak, and if the energy of the pulse discharge is too great and the thickness of the fusion layer exceeds about 20 ⁇ m, the surface roughness of the coating will be reduced. It was found that the cracks were generated and many cracks were generated in the coating.
  • an electrode material as an electrode material, a ratio of "chrome (Cr) 25 wt%, nickel (Ni) 10 by weight 0/0, tungsten (W) 7 wt%, remainder cobalt (Co)" Cobalt (Co) alloy powder with a particle size of about 1 ⁇ m prepared by melting the compounded metal was used, but the electrode material is not limited to this alloy. Specifically, a conoret (Co) alloy powder having another composition may be used, or a nickel (Ni) alloy powder, an iron (Fe) alloy powder, or the like may be used.
  • the formed coating contains about 30% or more of a metal component that does not form carbides.
  • cobalt (Co), nickel (Ni), iron (Fe), etc. which are metal materials, are contained in the electrode material at a volume ratio of about 40% or more.
  • these metals can be used alone or as a mixture.
  • chromium (Cr) is a material that forms carbides.
  • Cr chromium
  • the amount of chromium (Cr) metal that does not completely become carbides remains in the coating.
  • Mo molybdenum
  • tungsten (W) tungsten
  • wear The ease with which carbides are formed by the material can be easily determined from Ellingham diagrams.
  • the binder component is not limited to paraffin wax and polyethylene.
  • raffin wax stearic acid or wax such as zinc stearate may be used.
  • polyethylene a thermoplastic resin such as polypropylene or acrylic resin, or a protein material such as agar may be used as long as the substance exhibits a reversible reaction of sol-gel.
  • Agar and the like may be water-soluble substances such as water-soluble substances.
  • the particle size of the electrode material will be described.
  • the force using a cobalt (Co) alloy powder having a particle size of about 1 ⁇ m has the following reasons.
  • the inventors In the discharge surface treatment, the inventors have found that there are several significant boundaries within the category of particle size.
  • the first boundary is in the vicinity of a particle size of 10 ⁇ m.
  • the particle size is about 10 ⁇ m or more, it becomes difficult to generate a stable discharge, and the formation of the coating itself becomes difficult. Therefore, by setting the particle size to about 10 m or less, it is possible to produce a discharge surface treatment electrode that can generate a discharge reliably and stably.
  • the second boundary is in the vicinity of 3 ⁇ m.
  • the particle size is about 3 m or less, it is easy to produce a uniformly compressed shaped body. If the electrodes cannot be compressed uniformly, the coating cannot be formed uniformly due to the difference in the density or hardness of the electrodes. Therefore, in order to form a uniform film, the average particle size must be about 3 ⁇ m or less. However, it is effective in the case of increasing the density of the electrode that a part of the electrode is mixed with a powder having a reasonably large particle size that may be mixed with a powder larger than about 3 m. is there.
  • the third boundary is in the vicinity of a particle diameter of 1 ⁇ m.
  • the larger the particle size of the powder the greater the energy of the discharge pulse required to melt the powder.
  • the unit of the material to which the electrode force is supplied increases, resulting in a problem that voids increase in the film.
  • the molding pressure is a force set to about 50 MPa to 200 MPa as in the first embodiment.
  • This pressure is not limited to this range because the range varies depending on the state of the mixture to be press-fitted. For example, when the viscosity of the mixture of the electrode powder and the binder is high due to a small amount of the binder, it is better to increase the pressure. For example, an appropriate pressure is about 100 MPa to 300 MPa.
  • the bonding between the electrode powders can be strengthened as in the case of the first embodiment, a small discharge surface treatment electrode having a complicated shape is provided. It is possible. Further, as in the case of the first embodiment, it is possible to easily and efficiently manufacture a small discharge surface treatment electrode having a complicated shape without performing post-processing.
  • the electrode for discharge surface treatment can be manufactured without performing post-processing, the cost for post-processing does not increase, and the electrode material by post-processing does not occur, and the discharge surface treatment It is possible to manufacture the electrode for a low price.
  • a green compact (compression molded body) can be extruded using an extrusion molding machine 400 as shown in FIG.
  • FIG. 10 is a diagram for explaining the principle of the extrusion molding machine, and is a schematic diagram showing a part of the extrusion molding machine as a cross-sectional view.
  • compression molding 404 can also extrude the tip force of the die 402.
  • the opening shape of the tip of the die 402 is a shape corresponding to the electrode shape.
  • the discharge surface treatment electrode can be produced in the same manner as in Embodiment 1 except for the above-described forming method. it can.
  • the bonding between electrode powders can be strengthened in the same manner as in the first embodiment. It is possible to provide a surface treatment electrode. As in the case of Embodiment 1, a small discharge surface treatment electrode can be easily and efficiently manufactured without post-processing. In addition, according to the present embodiment, since the electrode for discharge surface treatment can be manufactured without performing post-processing, there is no increase in cost due to post-processing. It is possible to manufacture the surface treatment electrode at low cost.
  • the method for manufacturing a discharge surface treatment electrode according to the present invention is useful for manufacturing a discharge surface treatment electrode having a complicated shape.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention concerne un procédé de production d'une électrode pour le traitement de surface par décharge, ledit traitement de surface impliquant de : fournir une électrode en poudre moulée, ladite poudre moulée résultant du moulage d'une poudre de métal, de composé métallique ou de céramique; puis provoquer une impulsion de décharge entre l'électrode et une surface de travail placée dans un liquide ou un gaz de traitement, de sorte que l'énergie de la décharge permette de déposer sur ladite surface de travail un revêtement de matériau d'électrode ou un revêtement d'une substance résultant de la réaction du matériau d'électrode sous l'effet de l'énergie de la décharge par impulsions. Le procédé de fabrication de l'invention implique d'amener, sous pression, un mélange pourvu d'une plasticité que l'on obtient en mélangeant une poudre de métal, de composé métallique ou de céramique avec un liant, dans un moule à la forme de l'électrode, de manière à obtenir une forme moulée, puis à chauffer ladite forme moulée afin d'éliminer les composants liants et ainsi produire l'électrode voulue.
PCT/JP2006/314189 2006-07-18 2006-07-18 Procédé de production d'une électrode pour le traitement de surface par décharge et procédé de traitement de surface par décharge Ceased WO2008010263A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/314189 WO2008010263A1 (fr) 2006-07-18 2006-07-18 Procédé de production d'une électrode pour le traitement de surface par décharge et procédé de traitement de surface par décharge

Applications Claiming Priority (1)

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PCT/JP2006/314189 WO2008010263A1 (fr) 2006-07-18 2006-07-18 Procédé de production d'une électrode pour le traitement de surface par décharge et procédé de traitement de surface par décharge

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009099239A1 (fr) * 2008-02-05 2009-08-13 Suzuki Motor Corporation Procédé de revêtement par décharge électrique et électrode compacte verte utilisée pour celui-ci
US11826426B2 (en) 2017-08-02 2023-11-28 The University Of Chicago Nanoscale metal-organic layers and metal-organic nanoplates for x-ray induced photodynamic therapy, radiotherapy, radiodynamic therapy, chemotherapy, immunotherapy, and any combination thereof
US11872311B2 (en) 2011-07-08 2024-01-16 The University Of North Carolina At Chapel Hill Metal bisphosphonate nanoparticles for anti-cancer therapy and imaging and for treating bone disorders

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001005545A1 (fr) * 1999-07-16 2001-01-25 Mitsubishi Denki Kabushiki Kaisha Electrode pour traitement de surface par decharge et procede de production de celle-ci
JP2004137576A (ja) * 2002-10-18 2004-05-13 Mitsubishi Electric Corp 放電表面処理用電極

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001005545A1 (fr) * 1999-07-16 2001-01-25 Mitsubishi Denki Kabushiki Kaisha Electrode pour traitement de surface par decharge et procede de production de celle-ci
JP2004137576A (ja) * 2002-10-18 2004-05-13 Mitsubishi Electric Corp 放電表面処理用電極

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009099239A1 (fr) * 2008-02-05 2009-08-13 Suzuki Motor Corporation Procédé de revêtement par décharge électrique et électrode compacte verte utilisée pour celui-ci
JP5263175B2 (ja) * 2008-02-05 2013-08-14 スズキ株式会社 放電被覆方法およびそれに用いる圧粉体電極
US11872311B2 (en) 2011-07-08 2024-01-16 The University Of North Carolina At Chapel Hill Metal bisphosphonate nanoparticles for anti-cancer therapy and imaging and for treating bone disorders
US11826426B2 (en) 2017-08-02 2023-11-28 The University Of Chicago Nanoscale metal-organic layers and metal-organic nanoplates for x-ray induced photodynamic therapy, radiotherapy, radiodynamic therapy, chemotherapy, immunotherapy, and any combination thereof

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