Analysis And Optimization On Cutting And Crushing Rock Of Carbide Drill Based On LS-DYNA

The breaking effect can directly determines the success of the core drilling, whic h is regarded as one key issues of the lunar surface sampling. Due to the bad working conditions of the vacuum and dry harsh environment, higher drilling requirements are needed to realise higher cutting efficiency and reliability. In this paper, the lunar roc k’s breaking mechanism is researched, providing a theoretical and design basis for sel ecting drill process and optimizating drill bit.The relevant researches show that the carbide drill would be widely used in the near-Earth outer space drilling. We focus on analysing the force produced on the cutting teeth, which is directly related to the efficiency and reliability of the cutting process.The method of smoothed particle hydrodynamics SPH, was used to deal with the relative large calculation errors in Lagrangian meshin g algorithm. The strength criterion, the definition of damage, and three state equations are analysed in the constitutive model in LS-DYNA. By observing the process of cr ushing until rock cuttings produced, the simulation results and the crushing effect stre ss cloud animation, it is concluded that there are both finely divided cuttings and large pieces of debris when rock breaks, and that the mechanical model confirms the theore tical analysis of rock crushing process.In this paper, the cutting force when it comes to the mare basalts was analysed th rough combining the theoretical analysis and numerical simulation of finite element a nalysis with single factor and orthogonal method. The factor involves the cutting toot h’s rake angle, width and depth. of cut of lunar rocks more common cutting simulatio n. It is concluded that the average cutting force reaches its lowest when the angle is 10 ° with the cutting tooth’s width of 0.7cm. For cutting process and simulation analysi s, the cutting force exhibited a related volatility with the rock crushing, which provide s a theoretical basis for further study. In addition, the cutting force will increase sharpl y when the particle size is relatively small. The cutting force is also described in terms of drilling mixed rocks. The micro-drilling system was subjected to simulate lunar rocks sampling. The results show that the crushed rock’s cuttings are accord with the theoretical results and that the volatility of the torque is also accord with the the one of the simulation.