Investigations on the Wear Rate of Sintering Diamond Core Bit during the Hole Drilling Process of Al₂O₃ Bulletproof Ceramics

Table 1

Test conditions.

Test no.	Bit performance parameters		Number of water gaps	Wall thickness (mm)	Technological parameters		Number of machined holes
	Grit size (mesh)	Concentration (%)			Bit load (N)	Spindle speed (rpm)
1	35/40	75	3	2	352	3200	23
2	50/60	75	3	2	352	3200	13
3	35/40	125	3	2	352	3200	26
4	35/40	75	2	2.5	278	3200	33
5	35/40	75	4	2.5	278	3200	21
6	45/50	125	4	2	390	3200	15
7	45/50	125	4	2.5	390	3200	9
8	35/40	75	3	1.5	352	3200	9
9	45/50	125	4	2.5	278	3200	23
10	35/40	75	3	2	352	1750	21