POLYGRANULAR MASS FOR PRODUCTION OF STRUCTURED ABRASIVE TOOL Russian patent published in 2014 - IPC B24D3/18 B24D3/34 

FIELD: process engineering.

SUBSTANCE: invention relates to production of abrasive tools of ceramic binders with fine-count-structures. Abrasive mass comprises the mix of grains of three groups: first group is composed of the grain sized to 160-420 mcm, second group is composed the grain sized to 120-159 mcm and third group is composed the grain sized to 90-119 mcm. Note here that total volume content of the first two groups corresponds to volume content of abrasive for preset count of abrasive tool structure while that of the third group makes 5-15% of the first group grain volume content. Filler consists of the mix of pit particles sized to 250-800 mcm in amount of 15% of abrasive mass volume. Invention allows decreasing the volume strain ay high-temperature tool sintering. Application of minor fineness of equal-density grains with working abrasive grains allows more homogeneous mixing of abrasive mass for producing more homogeneous volume structure.

EFFECT: increased quantity of solid crystallisation centres of fused ceramic binder at its cooling with formation of strong chemical bond.

2 cl, 1 tbl, 8 ex