Analysis On Diamond Tool Machine Error And Study Of Grinding Mechanism

A diamond tool grinding machine developed by the lib was researched, throughthe multi body system theory and homogeneous coordinate transformation theory, weestablished the geometric error model of the diamond lapping machine, the errormodel was established for the reasonable selection of machine parameters andproviding a theoretical basis for error compensation. Through the solution andanalysis of the diamond lapping machine error in the feed direction, there are11errors have great influence in the feed direction, established the relationship betweenthe11errors and the parameters of translation machine and rotating platform, andspecific methods are put forward to reduce the influence of the11errors. To obtain theremoval mechanism of diamond tool in the mechanical lapping process, we carried onthe simulation experiment of the grinding mechanism using molecular dynamicssoftware LAMMPS, and showed the simulation results with VMD software. TheMEAM potential was used between Fe-Fe atoms and Fe-C atoms, The Tersoffpotential was used between the C-C atoms the models established were as follows:(1) The Fe atoms grinded the diamond cutting tool, its purpose is to investwhether the Fe atoms in cast iron have effect on the grinding process.(2)The diamond abrasive particles grinded the diamond tool, The simulationresults show the structure of the diamond tool was changed, however, the processlasted for quite a shot time, the C atoms in the diamond tool finally turn back todiamond structure.(3) The simulation model of diamond tool does not contact with cast irongrinding wheel. The results showed that although the diamond tool did not touch thecast iron wheel, but after diamond particles grinding the diamond tool, Fe atoms arediffused into the diamond tool, and the diffusion occurred in two forms.(4) The comparison models of whether Fe atoms have diffused into the diamondtool first. The lapping depth was1,2,2.5,4,5, from the simulationresults we can make the conclusion that the number of removed C atoms in thediamond tool increases with increasing depth of lapping in both simulations, anotherconclusion is under certain conditions when the grinding depth is less than a certaincritical value, the removal efficiency of diamond tool with Fe atomic diffusion into C atoms is less than direct mechanical grinding, once the lapping depth is larger than thecertain critical depth, the removal efficiency of the diamond tool with Fe atomicdiffusion is greater than the directly grinding diamond tool.The simulation results can explain the mechanism of removal of C atoms of thediamond cutting tool in lapping process by atom level, by the way, the resultsrevealed why the grinding process should be made in the cast iron grinding wheel.