半固着磨具“陷阱”效应的颗粒流模拟

Particle Flow Simulation on the "Trap" Effect of Semi-fixed Abrasive Plate

利用PFC软件建立了半固着磨具颗粒流模型,磨具中结合剂对磨粒的粘结作用由平行连接行为描述。模型参数通过半固着磨具试样的压缩比实验获得。考虑单颗大颗粒的"陷阱"效应,以量纲一的大颗粒陷入磨具的深度及对工件的法向载荷为指标,对半固着磨具的"陷阱"效应进行了仿真。讨论了磨具结合强度、加工载荷、大颗粒尺寸对"陷阱"效应的影响,发现磨具结合强度低、加工载荷大和大颗粒尺寸小将有利于"陷阱"效应的发挥。

A particle flow model of semi-fixed abrasive plate （SAP）.was developed with PFC （particle flow code）,in which the holding power of the bond to the abrasive grains was described by the parallel bond behavior. The parameters of the particle flow model were obtained by experimental tests of compression ratio of SAP samples. The ＂trap＂ effect of one large grain was simulated, and evaluated by tow dimensionless parameters of the falling depth of the large grain into the plate and the normal force of the large grain on the workpiece. The effects of bond strength, load, and the size of large grain were analyzed, and the results show that low bond strength, high load or small size of large grain tend to improve the ＂trap＂ effect.