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A superhard aggregate abrasive with high micro-fracture characteristics and its preparation method

An aggregate and micro-crushing technology, which is applied in polishing, honing, abrasive preparation, grinding, abrasive processing (grinding field, to achieve stable processing efficiency, improve quality, and low cost

Active Publication Date: 2021-09-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is aimed at the micro-breaking characteristics of the existing self-sharpening sintered abrasives, which cannot keep up with the passivation speed of the abrasive grains when the force of the abrasive grains is low or the processed workpiece is a superhard and brittle material. To solve the problem of stability and improvement of processing quality, a superhard aggregate abrasive with simple preparation and high micro-breaking characteristics is invented and its preparation method is provided at the same time. The present invention adopts component design, binder optimization, vacuum sintering process optimization and Through a series of processes such as classification treatment, superhard aggregate abrasives with high micro-breaking characteristics are obtained, which can be used to prepare resin abrasive tools, and are used in processing technology fields such as grinding, grinding, polishing and honing of various workpieces

Method used

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  • A superhard aggregate abrasive with high micro-fracture characteristics and its preparation method
  • A superhard aggregate abrasive with high micro-fracture characteristics and its preparation method

Examples

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Effect test

example 1

[0027] Such as Figure 1~2 shown.

[0028] A superhard aggregate abrasive with high micro-fracture characteristics, which is made of 7-14 μm diamond powder, highly brittle germanium bond and brittle modifier copper powder, and its preparation method is: diamond, high brittle bond Fully mix with copper powder in the ratio of 80:15:5 by mass, add polyvinyl acetate binder (6% of the mass of the mixture) to the mixture, and then press the green body into the vacuum furnace (vacuum degree lower than 133Pa), degumming at 350°C for 0.5 hours at medium temperature and sintering at 950°C for 2 hours at high temperature; then crushing and grading to obtain superhard aggregate abrasive grains with high micro-fracture characteristics. The superhard aggregate abrasive grains with a particle size of 10-150 μm are used to prepare resin grinding wheels. When grinding ferrite magnetic workpieces, the workpiece surface roughness Ra is better than 100nm, and the processing performance is stable...

Embodiment 2

[0030] A superhard aggregate abrasive with high micro-fracture characteristics, which is made of 3-5 μm diamond, high brittle silicon alloy powder binder and brittle regulator aluminum powder, and its preparation method is: diamond, high brittle binder Fully mix with aluminum powder at a ratio of 75:20:5 by mass, add polyvinyl acetate binder (10% of the mass of the mixture) to the mixture, and then press the green body, put it into a vacuum furnace, and heat it at 450 Degumming at medium temperature for 2 hours and high temperature sintering at 850℃ for 3 hours. The vacuum degree of the vacuum furnace is controlled at 133Pa or below; then crushing and grading are carried out to obtain superhard aggregate abrasive grains with high micro-fracture characteristics. Among them, 15-100 μm superhard aggregate abrasive grains are used to prepare a fixed abrasive resin grinding pad. When grinding mobile phone glass panels, the surface roughness Ra of the workpiece is better than 150nm, ...

Embodiment 3

[0032] A superhard aggregate abrasive with high micro-fracture characteristics and a preparation method thereof, which is made of 10-14 μm cubic boron nitride abrasive, a highly brittle silicon alloy powder binder and a brittle regulator aluminum alloy powder, and the preparation method For: Cubic boron nitride abrasive, highly brittle binder and aluminum alloy powder are fully mixed in a ratio of 70:20:10 by mass, and polyvinyl alcohol binder (8% of the mass of the mixture) is added to the mixture and stirred evenly After pressing the green body and putting it into a vacuum furnace, carry out medium temperature degumming at 400°C for 2 hours and high temperature sintering at 1000°C for 3 hours. The vacuum degree of the vacuum furnace is controlled at or below 133Pa; Superhard aggregate abrasive particles with micro-crushing properties. Among them, 10-150 μm superhard aggregate abrasive grains are used to prepare resin grinding wheels for grinding seamless steel pipes. The wor...

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Abstract

A superhard aggregate abrasive with high micro-breaking properties and a preparation method thereof, characterized in that the superhard aggregate abrasive is composed of superhard abrasive diamond (or cubic boron nitride), a highly brittle binder and brittleness adjustment The preparation method includes the following steps: (1) mix the superhard abrasive, the highly brittle binder and the regulator in proportion, and mix them evenly; (2) add the binder to the above mixture to make a blank; (3) pack After entering the vacuum furnace, carry out medium temperature degumming and high temperature sintering; (4) Carry out crushing and grading to obtain superhard aggregate abrasive grains with high micro crushing characteristics. The superhard aggregate abrasive of the present invention has a high micro-breakability. It can stabilize the processing efficiency under the processing conditions that are not easy to self-sharpen and improve the quality of the surface of the processed workpiece.

Description

technical field [0001] The invention relates to a technology of abrasive preparation and abrasive processing (grinding, grinding, polishing, honing), especially a superhard aggregate abrasive technology with high micro-breaking characteristics, specifically a high micro-breaking Characteristic superhard aggregate abrasive and its preparation method. Background technique [0002] With the maturity of synthesis technology and the sharp drop in production costs, superabrasives (diamond, cubic boron nitride) are more and more widely used in abrasive processing (Abrasive Processes). In the process of abrasive grain processing, the failure forms of superabrasives mainly include passivation, shedding, micro-breaking and macro-breaking caused by angular wear. Resin abrasives, especially resin abrasives for grinding, honing and polishing, have the characteristics of a large number of abrasives involved in processing at the same time, and small abrasive force. The passivation and pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14B24D3/34C22C26/00C22C29/16B22F1/00B22F9/04
CPCB22F1/0003B22F9/04B24D3/344B24D3/346C09K3/1427C22C26/00C22C2026/003
Inventor 朱永伟唐超王子琨丁聪陈佳鹏牛凤丽李军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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