Analysis and Experimental Verification of the Load Characteristics of Rotary-Percussive Drilling with an LRCB. The load characteristics of rotary-percussive drilling with an LRCB for lunar rock simulant are investigated using a comprehensive drill characteristics test platform.
In the initial drilling stage, the LRCB penetrates at PPR of 0.1mm/r, and the percussive mechanism is not activated (light yellow area).
Figure 13 shows variation trend of the average drilling load of the LRCB for different PPR as the percussion frequency increases from 0 Hz to 20 Hz.
Figure 13 shows that, once the impact load has been introduced, the drilling load of the LRCB decreases by different amounts and decreases further as the percussion frequency increases.
For percussion frequency 20 Hz and PPR 0.1 mm/r, the variation trend of the drilling load of the LRCB is shown in Figure 14.
In this paper, the process of penetrating lunar rock simulant via LRCB rotary-percussive drilling is analyzed.
(1) A load prediction model for lunar rock simulant penetration via LRCB rotary-percussive drilling is created.
Caption: FIGURE 1: Three-dimensional configuration illustration of the LRCB and the actual LRCB.
Caption: FIGURE 2: Curves for the LRCB's dual-row sharp cutting blade and matrix ellipsoid spiral chip removal.
Caption: FIGURE 12: Comparison of the LRCB drilling load before and after percussion applied.