Study on Auger Drilling Technology for Sampling Drilling in the Lunar Stimulants

• DOI: 10.1016/j.proeng.2014.06.190
• Publication Date: 2014-06-18T13:01:28Z
• Authors: Duan Longchen; Tan Songcheng; Gao Hui
• Keywords: Lead Angle; Auger Driller; 0103 physical sciences; Drilling Parameters; Bit Optimization; 01 natural sciences; Engineering(all)

AbstractUnder the limitation of rockets carrying capacity, the rated torque and power offered by drilling rigs, Therefore, the optimizations of auger driller's structure size and drilling parameters are necessary to realize deep lunar coring drilling under qualified condition. Study results indicate that the bit inner diameter is determined by target sampling mass and the density of drilling objects. Outer diameters of the bit and the helical blades are determined by the required power and torque for auger driller's restart from its state buried. To utilize the accommodated capacity of cuttings and dissipating the heat produced by bit during drilling process as much as possible, the lead angle is recommended to be 15°∼20°. The helical blade width should be obtained after other drill pipe parameters are determined. Feeding rate should be determined at first, and rotation speed is decided by the auger driller's structure size and feeding rate. Rotational speed will be enough as long as it can satisfy the normal discharge of the cuttings, otherwise its increasing would significantly increase drilling power.