Design and experimental performance verification of a thermal property test-bed for lunar drilling exploration

In this article, the temperature of a sampling drill in drilling lunar rock
 simulant in a high-vacuum environment was studied. The thermal problem was
 viewed as a one dimensional transient heat transfer problem in a
 semi-infinite object. The simplified drill was modeled using heat conduction
 differential equation and a fast numerical calculation method is proposed on
 this basis, with time and the drill discretized. The model was modified to
 consider the effects of radiation, drill bit configuration, and nonconstant
 heat source. A thermal analysis was conducted using ANSYS Workbench to
 determine the value of the equivalent correction coefficient proposed in this
 paper. Using fiber Bragg grating temperature measurement method, drilling
 experiments were conducted in a vacuum, and the results were compared to the
 model. The agreement between model and experiment was very good.

/pdf/prediction-of-the-temperature-of-a-drill-in-drilling-lunar-4x2shexuq8.pdf

Prediction of the temperature of a drill in drilling lunar rock simulant in a vacuum

Thermal simulation of drilling into lunar rock simulant by discrete element method

A thermal model for predicting the drilling temperature in deep lunar regolith exploration

Thermal vacuum regolith environment simulator for China’s deep lunar drilling exploration

The relation between temperature rise of bit and drilling parameters in drilling lunar soil simulant is studied in this paper through experimentation. Since it is difficult to measure the temperature of bit in the drilling process, fiber Bragg grating temperature measuring system is developed. Then, drilling experiments were carried out in normal and-30°C low temperature lunar soil simulant. This research showed a clear correlation between temperature rise of bit, rotational speed and torque in drilling process under specific lunar soil conditions. And the relations in drilling the two lunar soil simulants have similar patterns.

Sen Yin

Papers

Experimental Research on Temperature Rise of Bit in Drilling Normal and Low Temperature Lunar Soil Simulant

Effect of amplitude ratios on hole quality in longitudinal–torsional coupled ultrasonic-assisted drilling of CFRP composites

Study on tool wear mechanism of single-crystal diamond in ultrasonic vibration elliptical cutting of tungsten heavy alloy

Design of ultrasonic elliptical vibration cutting system for tungsten heavy alloy

Effects of ultrasonic vibration cutting trajectories on chip formation of tungsten alloys