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Method for preparing grinding disc with boron carbide

A boron carbide and grinding disc technology, applied in the field of boron carbide preparation of grinding discs, can solve the problems of high grinding rate, increased grinding cost, and high surface roughness of workpieces, so as to reduce difficulty and strength, improve workpiece qualification rate, and reduce workpiece roughness. Effect

Active Publication Date: 2018-05-18
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diamond grinding disc has a high grinding rate but has the following disadvantages: (1) The diamond powder is expensive and the output is low, which greatly increases the grinding cost; (2) The hardness of the diamond is too high, and it is easy to cause high surface roughness and scratches on the workpiece during the grinding process. Many, poor quality, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The method for preparing grinding discs with boron carbide adopts method one, comprising the steps of:

[0061] Step 1, Ingredients:

[0062] According to mass ratio, boron carbide: phenolic resin: chromium trioxide powder=5: 2: 93 ingredients, mix uniformly and make powder, wherein:

[0063]The purity of boron carbide is 97%; the particle size of boron carbide is 60-70 μm; the ratio of boron to carbon in boron carbide is 3.9; boron carbide is a single crystal particle, and the Mohs hardness is greater than 9.36;

[0064] The average particle size of phenolic resin and chromium trioxide powder is 50 μm;

[0065] Step 2, prepare abrasive layer:

[0066] (1) The powder is hot-pressed into a green body with a hot press: the temperature of the hot-press is 250°C, the time of the hot-press is 0.3h, and the pressure of the hot-press is 20MPa;

[0067] (2) curing the green body at 100° C. for 2 hours, and mechanically processing it to obtain a resin boron carbide abrasive l...

Embodiment 2

[0071] The method for preparing grinding discs with boron carbide adopts method one, comprising the steps of:

[0072] Step 1, Ingredients:

[0073] According to mass ratio, boron carbide: polyimide resin: zinc oxide powder=20: 15: 65 batching, mix uniformly and make powder, wherein:

[0074] The purity of boron carbide is 99%; the particle size of boron carbide is 6-12 μm; the ratio of boron to carbon in boron carbide is 4.0; boron carbide is a single crystal particle, and the Mohs hardness is greater than 9.36;

[0075] The average particle size of polyimide resin and zinc oxide powder is 20 μm;

[0076] Step 2, prepare abrasive layer:

[0077] (1) The powder is hot-pressed into a green body with a hot-press machine: the temperature of hot-pressing is 500°C, the time of hot-pressing is 2h, and the pressure of hot-pressing is 60MPa;

[0078] (2) curing the green body at 300° C. for 1 hour, and mechanically processing it to obtain a resin boron carbide abrasive layer with a...

Embodiment 3

[0082] The method for preparing the grinding disc with boron carbide adopts method two, comprising the steps:

[0083] Step 1, Ingredients:

[0084] According to the mass ratio, boron carbide: glass: white corundum=20:20:60 ingredients, mixed uniformly to obtain powder, wherein:

[0085] The purity of boron carbide is 98%; the particle size of boron carbide is 325-400 μm; the ratio of boron to carbon in boron carbide is 4.2; boron carbide is a single crystal particle, and the Mohs hardness is greater than 9.36;

[0086] The average particle size of glass and white corundum is 100μm;

[0087] Step 2, prepare abrasive layer:

[0088] (1) After the powder is pressed into a green body at room temperature, it is dried, wherein the pressing pressure is 50MPa, and the pressing time is 0.1h; the drying temperature is 50°C, and the drying time is 5h;

[0089] (2) After the dried green body is sintered at a high temperature, a ceramic boron carbide abrasive layer with a diameter of 6...

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Abstract

The method of preparing a grinding disc using boron carbide belongs to the field of preparation of abrasive tools. Method: 1) Use high-quality boron carbide as abrasive, and prepare a boron carbide grinding layer with resin binder hot pressing, ceramic binder high-temperature sintering, metal binder electroplating or sintering; 2) Through binder or electroplating, the abrasive is The layers and substrate are combined to form boron carbide grinding discs. The method of the present invention can reduce the roughness, edge chipping and cracking of the workpiece caused by excessive diamond hardness, increase the flatness of the grinding surface, improve the pass rate of the workpiece, and reduce the difficulty and intensity of the subsequent polishing process; the method of the present invention , greatly reducing the cost of the grinding disc and significantly improving its economic benefits.

Description

technical field [0001] The invention belongs to the field of grinding tool preparation, in particular to a method for preparing grinding discs with boron carbide. Background technique [0002] With the advancement of science and technology, grinding and polishing, as an important means of ultra-precision machining, are more and more widely used in engineering ceramics, optical glass, optoelectronic crystals, precision optics and other devices. Grinding and polishing have become an influence and even determine the product The key process of quality. Grinding is the previous process of polishing, which directly affects the subsequent polishing efficiency and the surface quality of the workpiece. There are two main ways of grinding: (1) fixed abrasive grinding; (2) free abrasive grinding. Among them, the bonded abrasives mainly include grinding discs, abrasive belts, and grinding wheels. [0003] As a kind of fixed abrasives, grinding discs are widely used due to their advan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D18/00
CPCB24D18/0009B24D18/0072B24D18/009
Inventor 邢鹏飞李欣王帅高帅波都兴红付念新李大纲曹宝胜
Owner NORTHEASTERN UNIV LIAONING