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Ceramic hollow sphere composite binder cubic boron nitride grinding wheel working layer and manufacturing method thereof

A cubic boron nitride and composite binder technology, which is applied in manufacturing tools, metal processing equipment, abrasives, etc., can solve the problems of poor stability of grinding quality, easy burns of workpieces, frequent dressing of grinding wheels, etc., to maintain sharp cutting edges, The effect of maintaining super wear resistance and improving support strength

Active Publication Date: 2012-07-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only reduces the sharpness of the grinding wheel and the safety of high-speed rotation, but also fails to obtain stable grinding quality
[0007] The above-mentioned inherent defects and drawbacks of CBN superabrasive grinding wheels have led to common problems such as easy burns of workpieces, frequent dressing of grinding wheels, and poor stability of grinding quality in the process of high-efficiency deep-cut grinding of difficult-to-machine materials.
In order to achieve the required machining quality goals, the material removal rate has to be reduced, making it difficult to achieve the expected high-efficiency grinding process

Method used

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  • Ceramic hollow sphere composite binder cubic boron nitride grinding wheel working layer and manufacturing method thereof
  • Ceramic hollow sphere composite binder cubic boron nitride grinding wheel working layer and manufacturing method thereof
  • Ceramic hollow sphere composite binder cubic boron nitride grinding wheel working layer and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Al 2 o 3 The particle diameter of ceramic hollow balls (provided by Zhengzhou Yuli Industrial Co., Ltd.) is 100-120 microns, and its mass accounts for 15% of the total mass of composite binder layer materials. 85% Cu-Sn-Ti alloy powder is selected (the content of Ti is 10%, the mass ratio of Cu and Sn is 2:1, and the pure powder is self-prepared), and the particle size is 20-30 microns. Will Al 2 o 3 The particles were mechanically mixed with Cu-Sn-Ti alloy powder, solid-phase sintered at a heating temperature of 600°C and a holding time of 30 minutes, and then cooled to room temperature to obtain a ceramic hollow ball composite binder. The CBN abrasive grains, 5% graphite grains, and 80% composite binder, accounting for 15% of the total mass of the working layer materials, were mechanically stirred and mixed uniformly, and then compressed into a blank with a pressure of 400MPa. Put the blank into a vacuum heating furnace, and carry out high-temperature vacuum liqui...

Embodiment 2

[0032] Al 2 o 3 The particle diameter of the ceramic hollow ball is 100-120 microns, and its mass accounts for 5% of the total mass of the composite binder layer material. 9.5% Cu-Sn-Ti alloy powder (the content of Ti is 10%, the mass ratio of Cu and Sn is 2:1) is selected, and the particle size is 20-30 microns. Will Al 2 o 3The particles were mechanically mixed with Cu-Sn-Ti alloy powder, solid-phase sintered at a heating temperature of 600°C and a holding time of 30 minutes, and then cooled to room temperature to obtain a ceramic hollow ball composite binder. The CBN abrasive grains accounting for 25% of the total mass of the working layer material, 5% graphite grains and 70% composite binder are mechanically stirred and mixed evenly, and then compressed into a blank with a pressure of 400MPa. Put the blank into a vacuum heating furnace, and carry out high-temperature vacuum liquid-phase activation sintering at a heating temperature of 880 ° C and a holding time of 30 m...

Embodiment 3

[0034] Al 2 o 3 The particle diameter of the ceramic hollow ball is 100-120 microns, and its mass accounts for 5% of the total mass of the composite binder layer material. 95% Cu-Sn-Ti alloy powder (wherein, the content of Ti is 10%, the mass ratio of Cu and Sn is 2:1) is selected, and the particle size is 20-30 microns. Will Al 2 o 3 Ceramic hollow sphere particles and Cu-Sn-Ti alloy powder were mechanically mixed and solid-phase sintered at a heating temperature of 600°C and a holding time of 30 minutes, and then cooled to room temperature to obtain a ceramic hollow sphere composite binder. 15% of CBN abrasive grains, 5% of graphite grains and 80% of composite binder, which account for the total mass of the working layer material, are mechanically stirred and mixed evenly, and then compressed into a blank with a pressure of 400MPa. Put the blank into a vacuum heating furnace, and perform high-temperature vacuum liquid-phase activation sintering at a heating temperature o...

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Abstract

The invention discloses a ceramic hollow sphere composite binder cubic boron nitride grinding wheel working layer and belongs to the field of manufacture of superhard abrasive tools. A ceramic hollow sphere composite binder is prepared by the following steps of: uniformly mixing 5 to 15 percent of alumina ceramic hollow sphere granules as a pore-forming material and enhancement phase and 85 to 95percent of Cu-Sn-Ti active matrix alloy (10 percent of Ti, 60 percent of Cu and 30 percent of Sn) serving as a matrix material of a grinding wheel working layer, and performing solid phase sintering and furnace cooling to room temperature. The composite binder cubic boron nitride grinding wheel working layer is prepared from the following steps of: mechanically and uniformly mixing 15 to 25 weight percent of cubic boron nitride abrasive particles, 5 weight percent of graphite particles and 70 to 80 weight percent of composite binder layer, pressing into blanks, putting the blanks into a vacuum furnace and performing high-temperature liquid-phase sintering. The prepared composite binder cubic boron nitride grinding wheel working layer has the characteristics of high porosity and high strength.

Description

technical field [0001] The invention relates to a ceramic hollow ball composite binder cubic boron nitride (cubic boron nitride, CBN for short) grinding wheel working layer and a manufacturing method thereof, belonging to the field of superhard abrasive tool manufacturing. Background technique [0002] High-performance cubic boron nitride (CBN) superabrasive grinding wheels are high-efficiency grinding tools for high-strength toughness and difficult-to-machine materials such as titanium alloys and nickel-based superalloys. The cubic boron nitride grinding wheel is mainly composed of four parts: CBN abrasive grains, bonding agent (carcass material), pores, and grinding wheel matrix (hub). Among them, the first three parts are collectively called the working layer, which is the part where the grinding wheel plays a grinding role, and the grinding wheel base mainly plays the role of supporting the working layer. For the working layer of the grinding wheel, the abrasive grains ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D3/04B24D3/14B24D18/00
Inventor 丁文锋徐九华陈珍珍傅玉灿苏宏华潘清史有姣
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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