Novel dry type machining grinding tool and preparation method thereof

An abrasive, dry technology, applied in the field of grinding, can solve the problems of sintering temperature sensitivity, decreased abrasive hardness, easy blockage and heat generation, etc., and achieves the effect of improving high temperature sintering performance, improving yield strength and good oxidation resistance.

Inactive Publication Date: 2016-07-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
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Problems solved by technology

In comparison, bronze binders have poor self-sharpening properties, are prone to clogging and heat generation, and are difficult to repair; the high price of cobalt makes the production cost of diamond abrasives high; iron and cobalt belong to the same group of elements, with similar properties and low price, but the iron content When it is greater than 40%, the iron-based binder is very sensitive to the sintering temperature, and it is easy to reduce the hardness of the abrasive tool due to under-burning and excessive erosion of diamond

Method used

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  • Novel dry type machining grinding tool and preparation method thereof
  • Novel dry type machining grinding tool and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a kind of preparation method of novel dry processing abrasive tool, comprises the following steps:

[0037] A) high-temperature bonding agent, common bonding agent and abrasive are carried out ball milling, obtain abrasive compound; Described high-temperature bonding agent comprises Ni 3 Al powder;

[0038] One or more of the common binder nickel-based binder, copper-based binder, iron-based binder and cobalt-based binder;

[0039] B) cold-pressing the abrasive compound to obtain a green body;

[0040] C) Sintering the green body to obtain a new type of dry machining abrasive.

[0041] In the present invention, it is preferred to mix and ball-mill the high-temperature bonding agent and common bonding agent to obtain the bonding agent mixture, and then ball mill the bonding agent mixture and abrasive material to obtain the abrasive tool mixture. In the present invention, the composition, particle size and dosage of the high-temperat...

Embodiment 1

[0050] 90 parts of Ni with a particle size of 6 μm 3 Al powder and 6 parts of cobalt-based pre-alloyed powder with a particle size of 20 μm are mixed and ball milled to obtain a binder mixture. The ball mill speed is 200r / min, the ball milling time is 20min, and the ball to material ratio is 10:1;

[0051] Ball mill 96 parts of the binder mixture and 4 parts of diamond abrasives with a particle size of 30-40 meshes to make them evenly mixed to obtain the abrasive mixture. The rotating speed of the ball mill is 200r / min, the ball milling time is 20min, and the ball-to-material ratio is 5:1.

[0052] Putting the abrasive mixture into a cold-pressing mold for cold-pressing to obtain an abrasive body. The compact density of the mold is 50% of theoretical density.

[0053] Carry out hot pressing sintering to the mold body, the sintering maximum temperature is 900°C, and the heat preservation is 25min. Pressure is 50Mpa, obtain superhard abrasive tool.

[0054] The present inven...

Embodiment 2

[0056] 80 parts of Ni with a particle size of 5 μm 3 Al powder and 14 parts of copper-based pre-alloyed powder with a particle size of 25 μm were mixed and ball-milled to obtain a binder mixture.

[0057] 94 parts of the binder mixture and 6 parts of diamond abrasives with a particle size of 40-50 meshes are ball-milled to make them evenly mixed to obtain the abrasive mixture. The rotating speed of the ball mill is 250r / min, the ball milling time is 15min, and the ball-to-material ratio is 10:1.

[0058] Putting the abrasive mixture into a cold-pressing mold for cold-pressing to obtain an abrasive body. The compact density of the mold is 50% of theoretical density.

[0059] Carry out hot pressing sintering to the mold body, the sintering maximum temperature is 1000°C, and the heat preservation is 20min. Pressure is 50Mpa, obtain superhard abrasive tool.

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Abstract

The invention provides a novel dry type machining grinding tool. Raw materials of the novel dry type machining grinding tool include a high-temperature bonding agent, an ordinary bonding agent and an abrasive material. The high-temperature bonding agent includes Ni3Al powder. The ordinary bonding agent includes one or more of a nickel-based bonding agent, a copper-based bonding agent, an iron-based bonding agent and a cobalt-based bonding agent. According to the novel dry type machining grinding tool, the high-temperature sintering performance of the grinding tool can be improved through matching of the high-temperature bonding agent including the Ni3Al powder and the ordinary bonding agent, and the grinding tool can have higher hardness. In addition, the novel dry type machining grinding tool can have good oxidation resistance under the high-temperature condition, and meanwhile the yield strength of the grinding tool is improved along with temperature rise. The experiment result shows that the Rockwell hardness of the grinding tool is 93 HRB. The invention further provides a preparation method of the novel dry type machining grinding tool.

Description

technical field [0001] The invention belongs to the technical field of grinding processing, and in particular relates to a novel dry processing abrasive tool and a preparation method thereof Background technique [0002] Diamond grinding tools are widely used in the grinding of engineering ceramic materials, crystal materials, semiconductor materials, hard alloy materials and composite materials. At present, in the field of high-precision grinding, metal-bonded diamond abrasive tools are mainly used in China, that is, diamond abrasive particles are bonded into a whole with a metal bond to form an abrasive tool. This type of grinding tool has the characteristics of strong bonding force, long grinding life and good shape retention. [0003] The metal bonds used in the manufacturing process of diamond abrasive tools mainly include: copper-based, cobalt-based, iron-based, nickel-based, tungsten-based and aluminum-based bonds. Among them, copper-based, cobalt-based and iron-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24D3/10B24D3/34B24D18/00
CPCB24D3/10B24D3/342B24D18/0009
Inventor 张凤林卢家锋张腾周玉梅伍尚华邓欣
Owner GUANGDONG UNIV OF TECH
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