Discrete element simulative analysis of lapping process 

on lapping film based on PFC3D

 

 

YING Zhengen, FENG Kaiping, Ni Chengyuan

 

(College of Mechanical Engineering, Quzhou University, Quzhou 324000, China)

 

 

Abstract: Aiming at solving the problems of the rough peak removing from the surface of the workpiece and the abrasive dropping off from the abrasives coating layer of the lapping film during the lapping process, the discrete element simulative analysis of lapping film lapping process was investigated. The lapping process of the lapping film and wprkpiece were modeled and simulated utilizing discrete element method based on PFC3D. The simplified model was contact friction process between the ideal trapezoidal convex asperity layer and the abrasivebinder mixing layer and the characterization of microstructure parameters was calculated by biaxial test, the variations of the unbalance force on the contact point, the process of element dropping, the influences of the bond strength of the binder and the abrasivebinder ratio on the lapping process were analyzed. The results indicate that unbalanced force on the contact point shows scattering style and gradually weakened, the peak value of the unbalanced force is 5.9×103N, the good lapping effect is reached when abrasive parallel bond strength is 723Pa and abrasiveblinder ratio is 1:6, as the rough peaks effectively remove and the blunt abrasives drop off.

 

Key words: lapping film; discrete element method; abrasive; rough peak; PFC3D