Papers by Keyword: Abrasive Process

Abstract: This paper describes design of a prototype of a wire-sawing machine and some machining demonstrations. Slicing the rock samples is preferable to observe their interior for in-situ analysis in lunar and planetary explorations. The requirements for the wire-sawing machine were clarified as follows: using a long saw wire to extend the duty cycle, and winding and unwinding the saw wire with two reels. After building a prototype of the wire-sawing machine, the cutting performance in vacuum was compared with that in air. The cutting depth in vacuum leveled off and was smaller than that in air.

Abstract: Molecular dynamics (MD) simulations of nanometric scratching with diamond tip are conducted on single crystal copper crystal plane (010), and MD simulations are carried out to investigate the mechanism of material removal and the generation of defects on the surface, subsurface and inner of material. During the process of diamond tip scratching the surface of single crystal copper on conditions of different scratching speeds, depths and widths. We achieved the forming details of the chip. While the generation and moving process of defects, such as dislocation, are recorded. The different times of atomic displacement and interaction force are also shown through MD simulation. The evolvement of the lattice pattern in the abrasive processes are analysed by radial distribution function (RDF) and computing the changes of workpiece’s atomic displaces and forces. At the same time, the lattice reconfiguration and the onset and the evolvement process of defects and are analysed by RDF and atomic perspective method, respectively. The simulation results show that scratching speed play role in the course of the form of removing chips, and that different scratching widths and depths of tool have effect on onset and evolvement of lattice defects of workpiece in abrasive processes. This study can give more fundamental understanding of nanosconstruction from atomistic motions and contribute to the design, manufacture and manipulation of nano-devices