A kind of vitrified bond cbn grinding tool and its preparation method and application
A ceramic binder and binder technology, applied in the field of wear-resistant materials, can solve the problems of difficult effective fiber performance, complex shaping process, complex crystallization process, etc., to improve the overall level of technology and technology, high economic benefits, The effect of suppressing abnormal growth
Active Publication Date: 2022-01-28
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology
However, the crystallization process is complicated and melting is difficult, and high temperature crystallization means that the product has a large sintering shrinkage, and the later shaping process is complicated
The third method is to add reinforcing agents to improve the strength of abrasive tools, such as adding aluminum borate whiskers, alumina fibers, etc., but the production cost is invisibly increased, and it is difficult for the fibers to achieve effective performance in the process
Method used
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Embodiment 1
[0027] 1) Mix 120-mesh CBN abrasive grains and 300-mesh glass bond powder at a mass ratio of 1:3, add PVB aqueous solution with a mass concentration of 5% for stirring mixing, and the quality of the PVB aqueous solution is the bond between CBN abrasive grains and glass 8% of the total mass of the agent, carry out 30min stirring type mixing, carry out sieve granulation after mixing, after granulation, spray the PVB aqueous solution that mass concentration is 5% to the granule surface, the quality of spraying PVB aqueous solution is the total mass of granule 5% of , after drying at 120 ° C, the glass bond coated CBN abrasive grains were obtained;
[0028] 2) According to the mass percentage of 80%: 20%, the CBN abrasive grains coated with glass bond and the 180 mesh NaCl solid particles were also mixed for 30 minutes by stirring, and the mixed powder was put into a zirconium corundum mold for half dry pressing;
[0029] 3) After molding, keep the molding pressure at 300MPa, rai...
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Abstract
The invention discloses a vitrified bond CBN grinding tool, a preparation method and application thereof, and belongs to the technical field of wear-resistant materials. CBN abrasive grains and glass bond are used as raw materials. After mixing with PVB aqueous solution and granulating, a certain amount of pore-forming agent is added, and sintered in a high-temperature mold under high temperature and high pressure for 30 minutes, which effectively inhibits the abnormal growth of crystal grains. After sintering Remove the pressure, lower the temperature to 550°C and keep it for 2 hours, which can effectively prevent sintering shrinkage; CBN abrasive grains and glass bond are mixed with 5% PVB aqueous solution and granulated, and then sprayed on the surface of the granulated particles with a mass concentration of 5 % PVB aqueous solution and then dried to further improve the strength of the coated particles. The preparation period is short, the product cost can be greatly reduced, and the method has high economic benefits.
Description
technical field [0001] The invention belongs to the technical field of wear-resistant materials, and in particular relates to a vitrified bond CBN abrasive tool and a preparation method and application thereof. Background technique [0002] Vitrified bond CBN grinding tools are used in all aspects of grinding processing due to their excellent performance, and gradually become the basis for the progress of advanced grinding technologies such as high-efficiency grinding, ultra-precision grinding, and grinding automation. Advanced grinding technology requires abrasive tools to have higher strength with higher porosity. Foreign countries require main parameters such as strength greater than 60MPa and porosity higher than 25%. However, there is still a big gap between China's vitrified bond CBN abrasive tools and foreign countries, mainly because it is difficult to effectively improve the strength of abrasive products on the basis of a certain porosity. [0003] There are many w...
Claims
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IPC IPC(8): B24D3/14B24D3/34B24D18/00
CPCB24D3/14B24D3/342B24D18/0009
Inventor 白建光何天颖张阳陈平黄传卿柴德亮陈茂进
Owner SHAANXI UNIV OF SCI & TECH