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| Research on Creep-Feed Deep Grinding of Particle-Reinforced Titanium Matrix Composites |
| LI Zheng, DING Wenfeng, XU Jiuhua, SHEN Long |
( College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China) |
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Abstract Particle-reinforced titanium matrix composites (PTMCs) has great application potentials in aviation and
aerospace industries. However, it is a typical difficult-to-cut material. Creep-feed deep grinding experiments were carried
out on PTMCs. The effect of grinding parameters and grinding mode on grinding forces and grinding temperatures was investigated.
The grinding temperature distribution and materials removal mechanism were discussed by finite element method.
The results show that the grinding forces increased with the increasing of the workpiece infeed speed and depth of cut.
The grinding forces for down grinding are always 10%~20% higher than that for up grinding, the grinding temperatures for
down grinding are always 10% lower than that for up grinding. When the depth of cut is greater than 0.6mm or the workpiece
infeed speed is larger than 400mm/min, grinding burn is easy to occur for down grinding because the grinding temperature
distribution is different between up grinding and down grinding. Furthermore, heat source model and the boundary
condition under the down grinding and up grinding conditions are proposed, respectively. The grinding temperature distribution
for two different grinding modes is simulated. The grinding temperature predicted by finite element method agrees
very well with the experimental data measured in the current investigation. The main ground-induced defects are adherence
and the voids produced due to the fracture and pull-out of the reinforced particles. The undeformed chip thickness per grain
has a significant effect on the removal mechanism of the hard-brittle reinforcements of PTMCs during grinding.
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2017, 
