About Analysis of the reasons why the rock drill does not impact
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6 FAQs about [Analysis of the reasons why the rock drill does not impact]
What happens if a drill bit hits a rock?
Due to the high-speed impact of the drill bit, the rock forms a crushed pit and generates debris under high pressure, manifesting as macroscopic rock spalling phenomenon (Fig. 10 b). When the drill rod impacts rock at 60 mm, the drill bit is completely penetrated, and the movement of the rock particles diminishes.
What happens when a drill rod hits a rock?
When the drill rod impacts rock at 60 mm, the drill bit is completely penetrated, and the movement of the rock particles diminishes. Meanwhile, parts of rock particles on the left side change from blue to red under the lateral pressure of the drill bit, indicating velocities exceeding 10 m/s.
What is the process of drill rod penetration and rock breaking?
Therefore, the process of drill rod penetration and rock breaking is essentially the cyclic loading and unloading of the rock under the impact . Combining Fig. 14 and Fig. 15, it can be seen that the required penetration depth for rock breaking decreases as the impact velocity of the drill rod is reduced.
Why do drill bits break rocks?
Kou et al. mentioned that the fundamental mechanism of rock breaking caused by drill bits is the formation and expansion of crushed zones and lateral cracks.
Does drill bit angle affect rock breaking?
The simulation results indicate that the drill bit angle has a significant influence on the rock breaking. When the angle is 40°, the rock breaking pattern is the common unidirectional splitting (Fig. 18 a). As the drill bit angle increases to a right angle, the rock breaking pattern transforms into a unique bidirectional splitting (Fig. 18 b).
What factors influence rock breaking performance?
The main factors influencing rock breaking performance are identified as drill rod diameter, drill bit angle, and impact velocity. Based on this model, rock breaking tools can be matched according to the rock characteristics, and the operational point position can be optimized.