Experimental Investigation on the Energy Consumption Difference between the Dynamic Impact and the Drilling Tests of Rocks

Table 3

Drilling test parameters of different samples.

Item	R^∗ (r/min)	P (N)	(mm/s)	Item	R (r/min)	P (N)	(mm/s)	Item	R (r/min)	P (N)	(mm/s)
Granite	1400	250	0.49	Cyan sandstone	700	30	0.18	Red sandstone	700	30	0.21
		300	0.92			40	0.21			40	0.32
		350	1.22			50	0.28			50	0.42
		400	1.53			60	0.37			60	0.53
	1600	250	0.88		900	30	0.19		900	30	0.40
		300	1.12			40	0.23			40	0.46
		350	1.32			50	0.31			50	0.63
		400	1.64			60	0.39			60	0.80
	1800	250	1.12		1100	30	0.21		1100	30	0.45
		300	1.27			40	0.27			40	0.54
		350	1.43			50	0.32			50	0.77
		400	1.76			60	0.41			60	0.91
	2000	250	1.32		1300	30	0.24		1300	30	0.52
		300	1.43			40	0.28			40	0.65
		350	1.59			50	0.35			50	1.02
		400	1.88			60	0.44			60	1.15

^∗Note: R, P, and represent revolution speed, drilling pressure, and drilling speed, respectively; additionally, the drilling speed was obtained under the bit wear without counting.