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Method for closing hole

A technology for closing holes and objects, applied in welding medium, gas flame welding equipment, plasma welding equipment, etc., can solve the problems of generating protective film, difficult to use protective film to close holes, difficult to apply, etc.

Inactive Publication Date: 2012-05-23
IHI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These techniques achieve the above-mentioned purpose by forming a protective film on a flat surface, but it is difficult to apply to the case where the object has a hole of a considerable size.
The reason for this is that since the discharge tends to occur in a concave portion such as a hole, it is difficult to form a protective film inside or directly above the hole, so it is difficult to close the hole with the protective film.

Method used

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  • Method for closing hole
  • Method for closing hole
  • Method for closing hole

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0025] The object W on which the protective film is to be formed is a machine part or the like, and needs to be made of a conductive material such as metal. Alternatively, the surface may be metal-plated for conductivity. The object W has a hole Wh as a closed object. The hole Wh is typically circular, but may have any other shape.

[0026] The object W is mounted on the support tool 17 as a workpiece of the electric discharge machine, and immersed in the machining fluid F composed of mineral oil. Instead of mineral oil, suitable non-conductive liquids or gases are also possible. The electrode 23 made of powder containing a conductive substance as described above is attached to the holder 29, and the servomotors 11 and 13 are operated appropriately to position the object W so that the electrode 23 overlaps the hole Wh. In addition, the electrode 23 is brought close to the object W by appropriately operating the Z-axis servo motor 21 .

[0027] Next, a voltage is applied fr...

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PUM

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Abstract

Provide is a method for closing a hole in an object with a film. The method comprises: attaching the object to an electric discharge machine as a workpiece; making an electrode approach the object so as to be overlapped with the hole, the electrode being formed of a powder including a conductive material; repeatedly applying a voltage by using the electric discharge machine between the electrode and the object so that discharging occurs therebetween and thereby growing a film for closing the hole from the periphery of the hole; and performing a mechanical process for sloping the edge of the hole before a step for applying the voltage or sloping the film along the edge of the hole during the step for applying the voltage.

Description

technical field [0001] The present invention relates to a method of forming a protective film by discharge and sealing a hole of an object with the protective film. Background technique [0002] For the purpose of improving various properties such as wear resistance, heat resistance, and corrosion resistance, various technologies for forming a protective film by using electric discharge have been proposed. These techniques achieve the above-mentioned purpose by forming a protective film on a flat surface, but are difficult to apply to the case where the object has holes of a considerable size. The reason for this is that since discharge tends to occur avoiding recesses such as holes, it is difficult to form a protective film inside or directly above the hole, and therefore it is difficult to close the hole with the protective film. Therefore, prior to forming the protective film, it is often performed to obtain a non-porous target surface by performing pretreatment such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00
CPCC23C26/00B23K35/0244B23K35/0261B23K9/04B23K26/34B23K10/02B23K26/3206B23K5/18C23C26/02B23K26/32B23K2103/50
Inventor 古川崇下田幸浩渡边光敏落合宏行
Owner IHI CORP