GRINDING TOOL Russian patent published in 2010 - IPC B24D5/14 B24D7/14 

FIELD: machine building.

SUBSTANCE: invention refers to machine building industry and can be used for production of grinding discs for processing of viscous hard-to-machine materials. Grinding disc includes coarse-grained and fine-grained sections of the abrasive, which are divided in parts with sections of abrasive of less hardness. Sections of coarse-grained and fine-grained abrasive are of equal length along external arc of grinding disc and twice as long than length of section of abrasive of less hardness. Section of fine-grained abrasive consists of micro-grinding powder, section of coarse-grained abrasive - from abrasive grain, section of abrasive of less hardness - from grinding powder. Hardness of abrasive is chosen depending on hardness of the processed material.

EFFECT: improving quality of the processed surface owing to eliminating disproportion of sizes of fine-grained and coarse-grained abrasive sections.