Vitrified grindstone having rough-textured homogeneous structure

Abstract

Provided is a vitrified grindstone having a rough-textured (porous) homogeneous structure, the vitrified grindstone being capable of grinding even hard-to-cut materials without generating a burn and while retaining shape-maintenance properties. According to this vitrified grindstone having a rough-textured homogeneous structure, abrasive grains fill the vitrified grindstone at a proportion of 23-35 vol% together with an inorganic hollow filler, the abrasive grains being homogeneous so as to have a standard deviation sigma of 8.7 or less in a frequency distribution map of abrasive grain area, which is a proportion of solids including the abrasive grains per unit area at a plurality of locations in a cross-section of the vitrified grindstone. This results in high homogeneity in a grindstonestructure and maintains shape-maintenance properties (reduction in the amount of wear of the grindstone) even with respect to a rough texture having a low volume ratio of abrasive grains, and therefore the generation of burns in a to-be-cut material is suppressed while shape-maintenance properties are maintained even with respect to hard-to-cut materials.

Description

technical field [0001] The present invention relates to a vitrified grinding stone with a low abrasive grain volume ratio, a porous coarse structure and a homogeneous structure, which is well used in the field where the grinding load is high and grinding burns are likely to occur on the workpiece. Background technique [0002] In general, high-porosity ceramic grindstones are known as grindstones suitable for use in areas where grinding loads are high, such as internal grinding and bevel grinding, and where grinding burns are likely to occur on workpieces. For example, the high-porosity CBN vitrified grindstone described in Patent Document 1 is like this. According to such a vitrified grinding stone with high porosity, high porosity is obtained by artificially forming pores with the pore-forming material. As a result, grinding heat is easily released during grinding under the grinding fluid, and grinding burn of the workpiece can be appropriately suppressed. . [0003] How...

AI Technical Summary

Problems solved by technology

In the prior art mentioned above, there is a disadvantage that the grindstone structure tends to become uneven in order to form large pores

In addition, in order to form pores, if an organic pore-forming material that is burned out during grinding stone firing is used, there is also a disadvantage that abrasive grains are likely to aggregate when they are rearranged due to firing shrinkage.

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