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Electrospark deposition-based preparation method of diamond abrasive particle layer

A technology of electric discharge deposition and diamond, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems that the electric spark deposition of metal materials and non-metal materials cannot be realized, and solve the problem of green recycling and reuse , the effect of high bonding strength

Inactive Publication Date: 2011-11-23
湖南高创海捷工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiency that the existing electric spark deposition technology cannot realize the electric spark deposition between the metal material and the non-metallic material, the present invention aims to provide a kind of electric spark deposition preparation method of the diamond abrasive grain layer, which can be deposited on the metal substrate Rapid deposition of a diamond abrasive layer with high bonding strength and a certain deposition thickness can also be used for the remanufacturing of old metal matrix grinding wheels, expanding the application range of EDM deposition technology

Method used

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  • Electrospark deposition-based preparation method of diamond abrasive particle layer
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  • Electrospark deposition-based preparation method of diamond abrasive particle layer

Examples

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Effect test

Embodiment 1

[0028] A kind of electric discharge deposition preparation method of diamond abrasive grain layer, adopts electric discharge machine tool to prepare diamond abrasive grain layer, such as figure 1 As shown, an electrode 6 is provided on one side of the workpiece 1, the workpiece 1 is connected to the positive pole of a pulse power supply 8 capable of generating discharge pulses, the electrode 6 is connected to the negative pole of the pulse power supply 8, and the working fluid 7 is injected during deposition. The gap between the workpiece 1 and the electrode 6, the electrode 6 is a compressed powder electrode formed by pressing and sintering the diamond abrasive grains 4 and the metal powder; the steps of the method are:

[0029] Turn on the pulse power supply 8, keep the discharge voltage at 70V-90V, the discharge current at 1.5A-9A, the discharge pulse width at 20μs-60μs, and the discharge pulse gap at 25μs-90μs; spray working fluid into the gap, and the pulse power supply 8 ...

Embodiment 2

[0087] The metal powder in the compressed powder electrode is silver powder and cobalt powder 5, which is pressed together with diamond abrasive grains and sintered in an inert gas to make a compressed powder, and the silver powder in the compressed powder electrode: diamond grinding Particles: The mass percentage of cobalt powder is (55~65):(20~25):(15~20), the particle size of cobalt powder is 3~5μm, the particle size of silver powder is 50~100μm, and the particle size of diamond abrasive is 80μm ~150μm, pressing pressure is 75MPa~90MPa, sintering temperature of compressed powder electrode is 650℃~750℃, electrode density after sintering is 6.82~7.15g / cm 3 .

[0088] The specific preparation method and other process conditions are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0090] The metal powder in the compressed powder electrode is copper powder 3 and nickel powder, which are pressed together with diamond abrasive grains and sintered in an inert gas to form a compressed powder, and the copper powder in the compressed powder electrode: Diamond abrasive grains: The mass percentage of nickel powder is (60~68):(18~22):(12~20), the particle size of nickel powder is 5~8μm, the particle size of copper powder is 120~180μm, the diamond abrasive grain The diameter is 80μm~150μm, the pressing pressure is 80MPa~100MPa, the sintering temperature of the compressed powder electrode is 650℃~800℃, and the electrode density after sintering is 6.75~7.18g / cm 3 .

[0091] The specific preparation method and other process conditions are the same as in Example 1, and will not be repeated here.

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Abstract

The invention discloses an electrospark deposition-based preparation method of a diamond abrasive particle layer. An electrode is arranged at a side of a workpiece. The workpiece is connected with a positive pole of a pulse power supply. The electrode is connected with a negative pole of the pulse power supply. Operating fluid is injected into a gap between the workpiece and the electrode during deposition. The electrode is a compression powder electrode. The method comprises the following steps that 1, the pulse power supply is turned on; a discharge voltage is maintained in a range of 70 to 90V; a discharge current is maintained in a range of 1.5 to 9 A; an electrical impulse width is maintained in a range of 20 to 60 microseconds; and a discharge impulse interval is maintained in a range of 25 to 90 microseconds, and 2, the operating fluid is sprayed to the gap; the pulse power supply produces discharge impulses; and compression powder of the compression powder electrode is deposited on the surface of the a workpiece to form an abrasive particle deposition layer. The method can prepare a diamond abrasive particle layer fast on an electrospark machine tool. Through the method, the circumferential surface of an old metal based grinding wheel is deposited with an abrasive particle layer, thus the problems of ultra-hard grinding wheel remanufacturing and green recycling are solved. The method is an economic and environmentally friendly remanufacturing technology.

Description

technical field [0001] The invention relates to a method for preparing a diamond abrasive grain layer by using a compressed powder electrode containing diamond abrasive grains for electric spark deposition. Background technique [0002] EDM is a processing method in which the high temperature generated by the pulse discharge between the workpiece and the electrode is used to etch the surface material of the workpiece. EDM deposition is the reverse processing of conventional EDM. EDM is to melt and infiltrate the conductive material in the electrode into the surface layer of the metal substrate through the action of spark discharge, and form a metallurgical bond with the base material, so that the physical and chemical properties of the substrate surface and A technique in which mechanical properties are improved. EDM deposition technology not only improves the mechanical, metallurgical, physical and other properties of the material surface, improves the wear resistance, cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/06
Inventor 余剑武盛晓敏廖玉山王小伟
Owner 湖南高创海捷工程技术有限公司
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