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Electric discharge surface treating method and electric discharge surface treating apparatus

A surface treatment device and surface treatment technology, which is applied in the coating process and coating of metal materials, can solve the problems of increased cost, low material utilization rate, and difficulty in streamlining, etc.

Inactive Publication Date: 2008-01-02
MITSUBISHI ELECTRIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, any of these welding and thermal spraying methods are manually performed, and skill is required, so there is a problem that it is difficult to streamline the welding and thermal spraying operations into a production line, and the cost increases.
In addition, welding is a method in which heat enters the workpiece intensively, so when dealing with thin materials, or when using direction control alloys such as single crystal alloys and unidirectional solidification alloys, which are easy to crack , there are also problems of easy welding cracks and low material utilization

Method used

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  • Electric discharge surface treating method and electric discharge surface treating apparatus
  • Electric discharge surface treating method and electric discharge surface treating apparatus
  • Electric discharge surface treating method and electric discharge surface treating apparatus

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Embodiment approach 1

[0038] In this first embodiment, basic matters of the discharge surface treatment method according to the present invention will be described. In the existing discharge surface treatment, for example, a compression-molded material mainly composed of Ti (titanium) fine powder is used for the electrode, and the electrode and the base material are bonded in the machining fluid (oil) using a dedicated pulse power supply. (workpieces) generate spark discharges. In the processing fluid, the electrode material is melted and Ti is precipitated by using the heat energy at this time, and the oil is also decomposed due to the heat, releasing free carbon elements (C), which are chemically combined to become ceramics, namely TiC (carbonization Titanium) This hard carbide forms a covering film on the surface of the base metal. As a result, a hard coating (TiC coating in the present example) can be formed on the entire surface of the base material, and properties such as heat conduction and...

Embodiment approach 2

[0071] 8 is a block diagram showing the configuration of an implementation device of the discharge surface treatment method according to Embodiment 2 of the present invention. In FIG. 8 , the electrode 21 for discharge surface treatment is a powder (with a particle size of about 1 μm to 2 μm) of a Co alloy “25% by weight of chromium, 10% by weight of Ni, 7% by weight of W, and others are Co” as a relatively easily meltable material. ) obtained by compression molding. The workpiece 22 as a material to be processed (base material) is made of a nickel alloy. The discharge electrode 21 and the workpiece 22 are arranged facing each other at a predetermined interval in the machining fluid 27 by a drive device not shown.

[0072] The negative terminal (negative pole) of the first power supply 23 and the negative terminal (negative pole) of the second power supply 28 are connected to the electrode 21 . On the workpiece 22, the positive terminal (positive pole) of the first power sup...

Embodiment approach 3

[0089] In Embodiment 3 of the present invention, the discharge pulse current conditions applicable to the case where the discharge electrode contains a difficult-to-melt material, or even if the discharge electrode contains an easily-melt material, the powder constituting the discharge electrode will be described. The particle size is large and it is difficult to melt.

[0090] Fig. 12 is a micrograph showing the state of the coating film formed on the workpiece under the same discharge conditions when the discharge electrode contains an easily meltable material and when it contains a hardly meltable material. FIG. 12( a ) shows the state of the discharge electrode obtained by compression-molding the powder of the Co alloy "Cr25wt%, Ni10wt%, W7wt%, others Co" used in Embodiment 2. FIG. 12( b ) shows the state of the discharge electrode obtained by compression-molding the powder of the above-mentioned stellite-based alloy "Mo28 wt%, Cr17 wt%, Si (silicon) 3 wt%, and others are ...

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Abstract

The present invention obtains an electric discharge surface treating method and an electric discharge surface treating apparatus capable of forming a dense and relatively thick film coating. When a voltage is applied to the inter-electrode gap between an electric discharge electrode (21) and a workpiece (22) from a first power supply (23) and an electric discharge occurs, a voltage for generating a second electric discharge current is supplied to the inter-electrode gap from a second power supply (28) for a short period of time. The second electric discharge current is superimposed on a first discharge current generated by the first power supply (23) and has a larger current value than the first current. Therefore, an electric discharge pulse current of a high-current value and a short pulse width having a rising speed of at least 40 A / [mu]s or more flows through the inter-electrode gap. As a result, only a necessary part of the electrode material is quickly melted and a large ratio of the melted electrode material can be contained in the electrode material migrating to the work side by the thermal energy of electric discharge or a compound of the electrode material, so that a film coating of the melted metal is formed on the surface of the work.

Description

technical field [0001] The present invention relates to a discharge surface treatment method and a discharge surface treatment device for forming a coating film on the surface of an object (workpiece) by using discharge machining technology, in particular, to a discharge surface treatment method and a discharge surface treatment method for forming a dense and thick coating film. Surface treatment device. Background technique [0002] It is known that Cr (chromium) or Mo (molybdenum) exhibits lubricity by being oxidized to oxides in a high-temperature environment, so currently, it is necessary to coat or deposit a material having strength and lubricity in a high-temperature environment. For example, on the surface of a turbine blade of a gas turbine engine for an aircraft, Co (cobalt) is used as a base, and a coating film formed of a material containing Cr or Mo is deposited thickly by welding or spraying. [0003] Among them, the so-called welding is a method of melting and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00
CPCB23H9/008B23H9/10C23C26/02
Inventor 后藤昭弘秋吉雅夫中村和司古川崇落合宏行渡边光敏
Owner MITSUBISHI ELECTRIC CORP
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