Mechanism and Efficiency of Combined Longitudinal-Torsional Vibration-Assisted Rock Drilling

doi:10.12068/j.issn.1005-3026.2024.04.013

Abstract

Abstract:

In response to the limitations posed by singular longitudinal or torsional vibration‐assisted rock drilling， a combined longitudinal‐torsional vibration‐assisted rock drilling scheme was proposed. Firstly， the theoretical model of the scheme is analyzed. Then， DEM （discrete element method ） simulations using EDEM （event driven execution manager） software are conducted to simulate the drilling mechanism and effects on rocks under various conditions. Results indicate that the addition of combined longitudinal‐torsional vibration assistance decreases the maximum resultant force on the drill bit by 36.45%， 9.34% and 32.84%， respectively， compared to zero vibration， longitudinal vibration， and torsional vibration schemes. Moreover， drilling speeds increase by 26.02%， 4.27% and 16.13%， respectively. Finally， experimental validation of the proposed scheme’s drilling performance reveals a 35.48% reduction in the drill head’s support strain and a 31.25% increase in the drilling speed when compared to solely adding torsional vibration assistance. It is demonstrated that the combined longitudinal‐torsional vibration‐assisted method can significantly enhance the efficiency of rock drilling.

Key words: rock drilling, vibration assistance, combined vibration, DEM（discrete element method）, drilling efficiency

CLC Number:

TD 823

Da-yong GAO, Jian-yong LIN, Ya-ting TIAN, Hong-liang YAO. Mechanism and Efficiency of Combined Longitudinal-Torsional Vibration-Assisted Rock Drilling[J]. Journal of Northeastern University(Natural Science), 2024, 45(4): 555-563.

Figures/Tables 30

Fig.1 Schematic diagram of combined vibration‐assisted rock drilling

Fig.2 Theoretical model of the combined vibration‐assisted rock drilling system

Fig.3 Discrete element model of rock specimens

Table 1 Physical parameter settings

试验材料	密度/（kg·m^-3）	泊松比	弹性模量/GPa
软岩	2 483	0.204	17.7
硬质合金	14 800	0.24	510

Table 2 Contact parameter settings

材料	恢复系数	静摩擦系数	动摩擦系数
软岩和软岩	0.20	0.70	0.10
软岩和硬质合金	0.50	0.60	0.07

Fig.4 Contact bond distribution

Fig.5 Contact surface adhesion model

Table 3 Adhesive bond parameter settings

法向刚度	切向刚度	法向强度	切向强度	黏结半径
N·m^-3	N·m^-3	Pa	Pa	mm
1.15×10⁹	4.6×10⁸	5×10⁷	2×10⁷	1.5

Fig.6 Adhesive bond distribution

Table 4 Parameters for the four drilling cases

钻削情况	钻头直径	转速	压力	频率	转矩
钻削情况	mm	r·min^-1	N	Hz	N·m
常规	16	3 300	50	0	0
纵	16	3 300	50	100	0
扭	16	3 300	50	0	140
纵-扭	16	3 300	50	100	140

Fig.7 Stress on rock specimens during drilling

Fig.8 Stress intensity distribution inside the rock

Fig.9 Breakage of adhesive bonds

Fig.10 Comparison of force on the drill bit in four cases

Fig.11 Comparison of drilling time in four cases

Fig.12 Platform model of combined vibration‐assisted rock drilling test

Fig.13 Installation of the cantilever structure

Fig.14 Excitation position of the shaker

Fig.15 Fixed structure of the impact driver

Fig.16 Acceleration curve without excitation

Fig.17 Acceleration curve at 47.71 Hz excitation

Fig.18 Acceleration curve at 82.44 Hz excitation

Fig.19 Acceleration curve at 111.22 Hz excitation

Fig.20 Strain curve without excitation

Fig.21 Strain curve at 47.71 Hz excitation

Fig.22 Strain curve at 82.44 Hz excitation

Fig.23 Strain curve at 111.22 Hz excitation

Fig.24 Drilling distance of the drill bit under different excitations

Table 5 Vibratory rock‐breaking test parameters

序号	转速/（r·min^-1）	激振频率/Hz	钻头直径/mm
1	1 200	47.71	3
2	1 200	82.44	5
3	1 200	111.22	8
4	2 500	47.71	5
5	2 500	82.44	8
6	2 500	111.22	3
7	3 300	47.71	8
8	3 300	82.44	3
9	3 300	111.22	5

Table 6 Analysis of extreme differences

序号	转速	激振频率	钻头直径	加速度振幅	应变差
序号	r·min^-1	Hz	mm	m·s^-2	应变差
1	1 200	47.71	3	7	58
2	1 200	82.44	5	10	54
3	1 200	111.22	8	22	49
4	2 500	47.71	5	8	65
5	2 500	82.44	8	18	55
6	2 500	111.22	3	25	45
7	3 300	47.71	8	8	57
8	3 300	82.44	3	20	54
9	3 300	111.22	5	35	40
极差1	8	19.66	2
极差2	4.67	15.33	1.34
主次顺序	激振频率>转速>钻头直径
最优水平	3 300	111.22	5
最优组合	转速3 300 r·min^-1，激振频率111.22 Hz，钻头直径5 mm

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