Superhard material abrasive tool and grinding process for difficult-to-machine materials

A superhard material abrasive tool for difficult-to-machine materials, comprising a first substrate (1), a pressing plate (2) and a plurality of grinding segments (3);

• wherein the first substrate (1) is of an annular structure, the plurality of grinding segments (3) are distributed in the circumferential direction of the first substrate (1) and assembled into an annular structure, and a radial water channel (4) is formed between every two adjacent grinding segments (3);
• the pressing plate (2) is of an annular structure, which is fixedly mounted at one end of the first substrate (1) and used for pressing the plurality of grinding segments (3) tightly;
• a mixed cooling passage (5) for feeding grinding fluid and/or cooling fluid is formed between the pressing plate (2) and the first substrate (1), a fluid inlet communicating with the mixed cooling passage (5) is formed between one end of the pressing plate (2) and one end of the first substrate (1), and the plurality of water channels (4) are respectively communicated with the mixed cooling passage (5);
• each of the grinding segments (3) comprises a plurality of abrasive particles, and the thickness h of each grinding segment (3) and the particle size b of the abrasive particles satisfy the following formula:
• b
• ≤
• h
• <
• 2
• ⁢
• b
• ;
• where the unit of both the thickness h of each grinding segment (3) and the particle size b of the abrasive particles is decimillimeter (dmm).