基于颗粒两相流的复杂回转体光整工艺参数优化研究

Study on Optimization of Finishing Process Parameters of Complex Rotating Body Based on Particle Two-phase Flow

针对一种回转体零件内部交叉相贯处存在毛刺的问题,设计了去除毛刺的装置,采用FLUENT软件验证该工艺的可行性,并对工艺参数进行优化。利用DPM模型和动网格技术研究了流场的速度变化、颗粒的运动轨迹以及不同工艺组合对去除效率的影响。结果表明:夹具起到搅拌功能,使得流体以更高的轴向和径向速度冲击回转体零件交叉相贯处;每一周期内颗粒的运动轨迹都不相同,其运动的无序性保证回转体零件表面不产生方向性划痕;磨损的主要部位发生在毛刺处,验证了工艺的可行性;当转速为4 000 r/min,往复直线运动速度为0.05 m/s时能达到较为合适的去除效率。

A device for removing burr is designed according to the burr problem existing in the intersection of a rotating body part. In order to verify the feasibility of process and to find the optimal process parameters,FLUENT software was used to study the flow field under the condition. The velocity variation of the flow field,the particle trajectory and the effect of different process combinations on the removal efficiency were investigated by using Discrete Phase Model（ DPM） and dynamic mesh technique. The results show that the design of the fixture has played a stirring function,making the fluid with a higher axial and radial velocity to impact the edges,corners and arris of the rotating body; the particle movement is random,each cycle the trajectory of particle motion was not the same,disorder of its movement ensured the surface not to produce directional scratches; erosion of the main parts occurred in the burrs,the feasibility of the process is verified. When the rotational speed was 4 000 r/min and the reciprocating linear motion was 0. 05 m/s,the removal efficiency is quite suitable.