Design and experimental optimisation of microdrilling pressure core sampling drill bits for deep-sea vehicles

Abstract In view of the need for fine exploration of deep-sea resources and scientific experiments, the research on core drilling technology of deep-sea submersibles was carried out by combining the fine operation advantages of Jiaolong manned submersible with drilling technology. According to the operation characteristics of Jiaolong manned submersible, rock drillability, operating conditions of micro-bit pressure and requirements of bit design were analyzed and studied. This paper focuses on the design of micro-bit coring bit, analyzes its drilling mechanism and parameter design, and finally develops two kinds of bit and optimizes the load behavior test. In addition, Jiaolong voyage was used to conduct deep-sea experiments and verify the load model, which provided theoretical and technical accumulation for the research of micro-bit core sampling for deep-sea launch vehicles.