WO2006057053A1 - 放電表面処理用電極及び放電表面処理方法並びに放電表面処理装置 - Google Patents
放電表面処理用電極及び放電表面処理方法並びに放電表面処理装置 Download PDFInfo
- Publication number
- WO2006057053A1 WO2006057053A1 PCT/JP2004/017699 JP2004017699W WO2006057053A1 WO 2006057053 A1 WO2006057053 A1 WO 2006057053A1 JP 2004017699 W JP2004017699 W JP 2004017699W WO 2006057053 A1 WO2006057053 A1 WO 2006057053A1
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- WO
- WIPO (PCT)
- Prior art keywords
- powder
- electrode
- 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.)
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the present invention generates a pulsed discharge between a molded body electrode formed by solidifying a metal powder, a metal compound powder, or a ceramic powder, and the workpiece, and the energy is used to generate the workpiece.
- the present invention relates to a discharge surface treatment for forming a film made of an electrode material or a material obtained by reacting an electrode material with discharge energy on the surface, and particularly relates to the production of a molded electrode.
- a technique for improving the corrosion resistance and wear resistance by coating the surface of a metal material by a submerged electric discharge machining method is disclosed in, for example, WC (Tungsten) as disclosed in JP-A-5-148615.
- This electrode material is deposited on the work by performing pulse discharge in liquid with an electrode formed by mixing carbide and Co powder and compression molding, and then using another electrode (for example, copper electrode, graphite electrode)
- a method has been established for remelting electrical discharge machining to obtain higher hardness and higher adhesion.
- Non-Patent Document 1 The literature based on the study by the present inventors shows that a thick film of about 3 mm can be formed using a WC-Co (9: 1) electrode (see Non-Patent Document 1).
- the film formation is unstable and difficult to reproduce, it appears to be dense with a metallic luster at first glance, but it is a brittle film with many vacancies, and it is weak enough to be removed when rubbed strongly with metal pieces. It was.
- Patent Document 1 Japanese Patent Laid-Open No. 5-148615
- Patent Document 2 JP-A-9-192937
- Patent Document 3 Patent No. 3227454
- Non-Patent Document 1 “Formation of Thick Film by Discharge Surface Treatment (EDC)” Akihiro Goto et al., Mold Technology, (1999), Nikkan Kogyo Shimbun
- the inventors have found that a dense thick film can be formed when a predetermined amount or more of a material that does not easily become carbide is mixed in the electrode material.
- Co Cobalt
- thicker films can be obtained by increasing the number of materials such as Ni (nickel) and Fe (iron).
- the electrode is produced mainly by compression molding in which powder is put into a mold and pressed.
- the 1S electrode size increases, it becomes difficult to produce a uniform product by pressing.
- the size of the electrode to be manufactured is pressed because the Co alloy powder is pressed from above and below in a predetermined mold. This is because the pressure is not transmitted as the upper and lower press surface forces are separated, and the central portion is not sufficiently compressed.
- the present invention has been made in view of the above, and establishes a technique for uniformly and stably manufacturing an electrode for discharge surface treatment by a discharge pulse in a liquid regardless of size. With the goal.
- An electrode for discharge surface treatment generates a pulsed discharge between a metal powder, a metal compound powder, or a molded electrode formed from a ceramic powder and a workpiece, With this energy, a discharge surface treatment that forms an electrode material on the workpiece surface or a coating made of a material that reacts with the discharge energy of the electrode material!
- a discharge surface treatment that forms an electrode material on the workpiece surface or a coating made of a material that reacts with the discharge energy of the electrode material!
- a liquid of water or organic solvent with a dispersant added a metal Powder, metal compound powder, or A step of mixing a ceramic powder to prepare a liquid mixed powder; a step of pouring the mixed powder into a mold; and removing the liquid by volatilization or absorption into the mold to form a powder compact; Heating the powder compact to a temperature at which electrical conductivity is obtained.
- the discharge surface treatment electrode according to the present invention can improve the uniformity of the electrode and can improve the film formation.
- a large-shaped electrode can be easily formed, even when a small electrode is required, a large electrode force can be cut out and used, and the productivity of the electrode can be increased.
- FIG. 1 is an explanatory diagram for explaining the production of an electrode for discharge surface treatment.
- FIG. 2 Process for manufacturing electrodes for discharge surface treatment.
- FIG. 3 Shows the relationship between the heating temperature when a powder compact made of Co alloy powder is heated for 1 hour and the electrical resistance value after heating at that temperature!
- FIG. 4 is a diagram showing a state in which discharge surface treatment is performed.
- FIG. 5 is a diagram showing the relationship between voltage and current in discharge surface treatment.
- FIG. 1 is an explanatory diagram for explaining the production of an electrode for discharge surface treatment in Embodiment 1 of the present invention.
- acetone which is an organic solvent to which a dispersant 2 is added in a container 1
- a Co alloy powder serving as a discharge surface treatment electrode are mixed to produce a mixed powder liquid.
- the electrode material may be, for example, an alloy powder material such as a Ni alloy or Fe alloy, a metal powder of Co, Ni or Fe alone, a conductive ceramic, or a powder in which a plurality of metal ceramics are mixed.
- the metal element is not limited to these materials.
- a predetermined amount that is, 40% by volume or more, more desirably 50% by volume or more, of a metal that does not form carbide or is hard to be carbonized, such as Co, Ni, Fe, etc. You should be! /
- volume% of the material in the alloy is difficult to define, here, the ratio of the value obtained by dividing the weight of each powder to be mixed by the density of each material is defined as volume%.
- Co with (cobalt) alloy (chromium) is the volume 0/0 of Co (cobalt) is ((weight% of Co) / (specific gravity of Co)) ⁇ (((weight% of Cr) / (Cr specific gravity)) + ((Co weight%) Z (Co specific gravity))).
- the material to be mixed as an alloy has a material with a specific gravity close to the original, it is almost the same as the weight percentage.
- the liquid to be mixed with the powder is not limited to acetone, but may be an organic solvent such as alcohol or toluene, or water if it is a material that is difficult to oxidize, such as ceramics or metal such as Co.
- FIG. 2 shows a process for manufacturing an electrode for discharge surface treatment according to the present embodiment.
- 3 is a mold made of a porous material such as gypsum
- 4 is a powder compact formed by removing the organic solvent from the mixed powder liquid 2.
- the process for manufacturing the electrode for discharge surface treatment roughly includes the following steps.
- the powder compact can be easily taken out.
- a mold 3 made of gypsum add a Co alloy powder with an average particle size of 1 to 2 ⁇ m or less, and a mixture 2 of an organic solvent and a dispersant.
- a dispersing agent stearic acid is added about 3 wt% of the Co alloy.
- the powder compact can be taken out by splitting the split mold.
- the surface of the molded electrode is polished.
- the powder compact 4 has good electrical conductivity and can be used as an electrode for discharge surface treatment, but in most cases, the electrical resistance is too high, In many cases, the strength is too weak to be used as an electrode as it is.
- the powder molded body 4 is heated so that it can be used as an electrode for discharge surface treatment.
- the powder compact 4 is made of a powder material, so it is easy to oxidize! For this reason, if the powder is heated simply, the powder will oxidize and adversely affect the conductivity of the electrode. Therefore, it is desirable to heat in an atmosphere such as a vacuum furnace!
- FIG. 3 shows the relationship between the heating temperature when the powder compact 4 made of Co alloy powder is heated for 1 hour and the electrical resistance value after heating at that temperature.
- the electric resistance value before heating varies depending on the material, etc. Usually, it is a value of 10 ⁇ or more, and it cannot be used as an electrode for discharge surface treatment.
- the electrical resistance can be lowered by heating the powder compact 4.
- the heating temperature is too high, the powder molded body 4 becomes too hard and becomes a so-called sintered state, and the electric resistance is reduced, but it cannot be used as an electrode for discharge surface treatment.
- the temperature resistance at which the electric resistance drops below 1 ⁇ and the force does not become too hard The optimum heating temperature for the powder compact 4.
- FIG. 4 shows a state where the discharge surface treatment is performed by the electrode manufactured by the above method.
- the electrode 11 and the workpiece 12 are spaced apart from each other and placed in a working fluid 14 such as oil, and a discharge is generated by applying a pulsed voltage from the discharge surface treatment power source 14.
- a working fluid 14 such as oil
- 15 is the arc column of the discharge that is generated at the moment when the discharge occurs.
- the discharge surface treatment power source 13 has a negative electrode polarity, and generates a pulsed discharge having a pulse width te of about several ⁇ m to several tens of ⁇ m as shown in FIG.
- the film formed by the above method is uniform and has a constant performance even if the location of the electrode changes. It is a film.
- the present embodiment it is possible to improve the uniformity of the electrode in the case of a carbide-based thin hard coating, and in particular, the uniformity of an electrode including a metal material that does not easily form carbides such as Co, Ni, and Fe. Improve sex.
- a large-shaped electrode can be easily formed, so that even when a small electrode is required, a large electrode force can be cut out and used, and the productivity of the electrode can be increased.
- the present invention relates to an electrode manufacturing technique used for discharge surface treatment.
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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)
- Powder Metallurgy (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2004/017699 WO2006057053A1 (ja) | 2004-11-29 | 2004-11-29 | 放電表面処理用電極及び放電表面処理方法並びに放電表面処理装置 |
| JP2006546514A JPWO2006057053A1 (ja) | 2004-11-29 | 2004-11-29 | 放電表面処理用電極及び放電表面処理方法並びに放電表面処理装置 |
| TW094105535A TWI256325B (en) | 2004-11-29 | 2005-02-24 | Electrode for surface treatment by electric discharge, and method and apparatus for surface treatment by electric discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2004/017699 WO2006057053A1 (ja) | 2004-11-29 | 2004-11-29 | 放電表面処理用電極及び放電表面処理方法並びに放電表面処理装置 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006057053A1 true WO2006057053A1 (ja) | 2006-06-01 |
Family
ID=36497802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/017699 Ceased WO2006057053A1 (ja) | 2004-11-29 | 2004-11-29 | 放電表面処理用電極及び放電表面処理方法並びに放電表面処理装置 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2006057053A1 (ja) |
| TW (1) | TWI256325B (ja) |
| WO (1) | WO2006057053A1 (ja) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI381898B (zh) * | 2009-07-28 | 2013-01-11 | Univ Far East | The method of obtaining rapid solidification alloy by means of electric discharge machining |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112329A (ja) * | 1993-10-15 | 1995-05-02 | Naotake Mori | 放電加工による表面処理方法およびその装置 |
| JP2002020882A (ja) * | 2000-07-04 | 2002-01-23 | Suzuki Motor Corp | 摺動部材及びその製造方法 |
| JP3421321B2 (ja) * | 1998-03-11 | 2003-06-30 | 三菱電機株式会社 | 放電表面処理用圧粉体電極および放電表面処理用圧粉体電極の製造方法 |
| JP2004076038A (ja) * | 2002-08-12 | 2004-03-11 | Suzuki Motor Corp | バルブシート皮膜形成方法およびバルブシート皮膜 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2494366C (en) * | 2002-07-30 | 2012-10-09 | Mitsubishi Denki Kabushiki Kaisha | Electrode for electric discharge surface treatment, method of electric discharge surface treatment, and apparatus for electric discharge surface treatment |
| JP3857625B2 (ja) * | 2002-07-30 | 2006-12-13 | 三菱電機株式会社 | 放電表面処理用電極および放電表面処理方法 |
-
2004
- 2004-11-29 JP JP2006546514A patent/JPWO2006057053A1/ja active Pending
- 2004-11-29 WO PCT/JP2004/017699 patent/WO2006057053A1/ja not_active Ceased
-
2005
- 2005-02-24 TW TW094105535A patent/TWI256325B/zh active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112329A (ja) * | 1993-10-15 | 1995-05-02 | Naotake Mori | 放電加工による表面処理方法およびその装置 |
| JP3421321B2 (ja) * | 1998-03-11 | 2003-06-30 | 三菱電機株式会社 | 放電表面処理用圧粉体電極および放電表面処理用圧粉体電極の製造方法 |
| JP2002020882A (ja) * | 2000-07-04 | 2002-01-23 | Suzuki Motor Corp | 摺動部材及びその製造方法 |
| JP2004076038A (ja) * | 2002-08-12 | 2004-03-11 | Suzuki Motor Corp | バルブシート皮膜形成方法およびバルブシート皮膜 |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200616735A (en) | 2006-06-01 |
| TWI256325B (en) | 2006-06-11 |
| JPWO2006057053A1 (ja) | 2008-06-05 |
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