Method for making vitreous bonded abrasive article and article made by the method
AssigneeCincinnati Milacron Inc.
InventorGary Huzinec
Life of this patent
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Abstract
A method for making vitreous bonded grinding wheels having a porosity of from 20 to 55% by volume is provided that reduces or prevent shrinkage. The method includes a step of mixing unclad, non-abrasive, non-metallic, particulate, inorganic solid shrinkage control agent with the abrasive grain, vitreous matrix precursor and other ingredients for producing the wheel. Non-abrasive hexagonal boron nitride is a preferred shrinkage control agent and may be used in amounts ranging for 1 to 10% by volume based on the volume of the grinding wheel. Reduced shrinkage of wheels made by the method over comparable wheels made without the shrinkage control agent is obtained.
Claims18
An improved method for making a vitreous bonded abrasive article having a porosity in the range of from 20 to 55% by volume comprising the steps of
- a) blending together abrasive grains and vitreous matrix precursor to form a uniform mixture,
- b) placing the mixture in a mold,
- c) compressing the mixture while in the mold and to form a compressed shape,
- d) heating the compressed shape at a temperature for converting the vitreous matrix precursor to a vitreous matrix binding together the abrasive grains,
- the improvement comprising the step of mixing a shrinkage reducing effective amount of a shrinkage control agent selected from the group consisting of minerals containing oxygen and a least one of the elements of silicon, aluminum and magnesium and hexagonal boron nitride having a hardness in the range of from 1 to 4 on the Mohs scale with the abrasive grains and vitreous matrix precursor, said agent being an unclad, non-abrasive, non metallic, particulate inorganic solid.
A vitreous bonded abrasive article having a porosity in the range of from 20 to 55% by volume produced by an improved method comprising the steps of
- a) blending together abrasive grains and vitreous matrix precursor to form a uniform mixture,
- b) placing the mixture in a mold,
- c) compressing the mixture while in the mold to form a compressed shape and
- d) heating the compressed shape at a temperature for converting the vitreous matrix precursor to a vitreous matrix binding together the abrasive grains,
- the improvement comprising the step of mixing a shrinkage reducing effective amount of a shrinkage control agent selected from the group consisting of minerals containing oxygen and a least one of the elements of silicon, aluminum and magnesium and hexagonal boron nitride having a hardness in the range of from 1 to 4 on the Mohs scale with the abrasive grains and vitreous matrix precursor, said agent being an unclad, non-abrasive, non-metallic, particulate, inorganic solid.
Dependencies are inferred from the claim text.