Electrochemical machining method, electrochemical machining device, and electrochemical machining solution

A processing method and technology for processing fluid, which are applied in the field of electrolytic machining of superhard alloys, and can solve the problems of deterioration of electrolytic machining fluid, inability to continue processing, and failure to establish a sediment treatment method.

Active Publication Date: 2016-06-22
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] As mentioned above, it has very excellent processing characteristics in essence, but has a big disadvantage, and it has not been put into practical use until now.
Its disadvantages are: as the processing proceeds, the electrolytic machining fluid deteriorates and processing cannot be continued; there is a safety problem that chlorine gas will be generated; there is no established treatment method for the chemically changed precipitate generated by processing, etc.

Method used

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  • Electrochemical machining method, electrochemical machining device, and electrochemical machining solution
  • Electrochemical machining method, electrochemical machining device, and electrochemical machining solution
  • Electrochemical machining method, electrochemical machining device, and electrochemical machining solution

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Embodiment approach 1

[0040]As mentioned above, the conventional electrolytic machining of cemented carbide has problems in that machining cannot be performed due to insufficient sodium ions during machining, and that tungsten, which is a valuable resource, cannot be recovered. In the present invention, the electrolytic machining method is to apply a voltage to the electrode as a negative electrode between the electrode and the workpiece, that is, the cemented carbide, so that a current flows, thereby anodizing the tungsten carbide (WC), which is the component of the workpiece, the cemented carbide (WC) Tungsten oxide (WO3) is formed, cobalt (Co) is electrolytically smelted, and tungsten oxide (WO3) produced by anodic oxidation is chemically dissolved for processing. In this electrolytic processing method, attention is paid to tungstic acid Ions (WO42-) react with calcium (Ca) ions. That is, sodium tungstate (Na2WO4), which is a product of electrolytic machining of cemented carbide, is water-solubl...

Embodiment approach 2

[0050] In Embodiment 1, the recovery of tungsten was described, but in Embodiment 2, it relates to an effective recovery method for other metal components and the like. In addition, it can have the same structure as other embodiment unless it specifically limits.

[0051] Co, Ti, Ta, etc. initially become chlorides in the reaction of electrolytic processing, forming CoCl2, TiC2, TaCl2, and as time goes by, form hydroxides, release Cl ions, and regenerate NaCl, so the electrolyte returns to the original electrolysis liquid. These metals can also be recovered in the state of hydroxides, but in this case, they are recovered as precipitates, which are bulky and the subsequent treatment is troublesome. In order to regenerate Co, Ti, and Ta as regenerated resources, it is preferable to recover them in a highly pure metal state, and attention is paid to electrodeposition. However, if the reaction is excessively performed in the hydroxide in order to perform electrodeposition effici...

Embodiment approach 3

[0070] In Embodiment 1, a method of recovering tungsten (W) in electrolytic machining of cemented carbide was described. This method is to use the electrode as the negative electrode, anodize tungsten carbide (WC) to become tungsten oxide (WO3), and at the same time electrolytically dissolve cobalt (Co), and oxidize the anode to produce tungsten oxide (WO3) chemically. The method of dissolving and processing is not necessarily limited to the case where the electrode is used as a positive electrode and the electrode is used as a negative electrode. The state is alternately repeated. However, in consideration of processing efficiency, it is preferable to use the electrode as a positive electrode to attract Na+ to the workpiece side and actively dissolve tungsten oxide (WO3). Embodiment 3 relates to a processing method while switching electrode polarity between positive and negative electrodes. In addition, it can have the same structure as other embodiment unless it specificall...

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Abstract

The invention provides an electrochemical machining method, an electrochemical machining device, and an electrochemical machining solution. In order to separate and remove sodium tungstate (Na2WO4) resulting from machining, the present invention provides a method for electrochemically machining a superhard alloy while switching the polarity, the method having a configuration wherein an aqueous common-salt solution (aqueous NaCl solution) or an aqueous sodium nitrate solution (Na(NO3)) is used as an electrochemical machining solution and a calcium salt is added beforehand to the electrochemical machining solution, thereby reacting the sodium tungstate (Na2WO4) resulting from the electrochemical machining with the calcium salt to yield calcium tungstate (CaWO4), and the calcium compound is separated and recovered on the basis of a difference in specific gravity.

Description

technical field [0001] The invention relates to an electrolytic machining method, device and electrolytic machining fluid for superhard alloys. Background technique [0002] Cemented carbide is a material obtained by sintering tungsten carbide (WC) with cobalt (Co) as a binder, and often contains titanium carbide (TiC), tantalum carbide (TaC) and the like as components. Cemented carbide is a material with high hardness and high wear resistance. Currently, electrical discharge machining is often used for shape machining. [0003] In the case of machining by electric discharge machining, the roughness at the maximum machining speed of 1 gr / min is about 50 μmRz in rough machining, and the consumption ratio of the copper-tungsten electrode is about 15%. Cracks can also occur. Even if the processing speed is reduced to about 0.2gr / min in order to reduce the occurrence of cracks, and the surface roughness of finishing is 10μmRz to 20μmRz, the electrode consumption ratio is still...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H3/10
CPCB23H3/10C25F3/02B23H3/08
Inventor 后藤昭弘斋藤长男毛利尚武叶石雄一郎汤泽隆
Owner MITSUBISHI ELECTRIC CORP
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