摘要
为了提高模具结构化表面光整加工的表面质量,通过流体体积模型和标准k-ε模型相结合的计算方法,以之字形微型流道为研究对象,对模具微型流道内部的软性磨粒流流场进行数值模拟。结果表明:随着入口流速的提高,管道内的磨粒流的平均速度也随之增大,有利于近壁区磨粒流与流道壁面的相互作用,从而提高磨粒流的加工效率。同时模具微型流道的形状和结构对磨粒流加工也有重要影响。当微型流道直径为2mm、入口速度为10m/s、湍动能为0.4m2/s2、湍流耗散率为19.8m2/s3时,与其他几组工艺参数相比,微型流道内轴向、切向速度分布及湍动能分布等更加均匀,能够得到较高的加工效率和表面纹理形态。数值模拟结果为深入研究软性磨粒流的基本规律提供了一种理论工具。
In order to improve the manufacturing quality in the finishing procedure of mould structural surface machining,by combining VOF model and standard k-ε turbulent model as its computational method,the numerical simulation of softness abrasive flow field in micro mould channel was carried out in a zigzag-shaped micro channel model.The computational results turn out that the average velocity of the abrasive particles grows along with the rising of the inlet velocity,which enhances the interaction between the abrasive particles and the channel surfaces,and consequently improves the machining efficiency.Meanwhile,the shape and structure of mould structural channel can also be very influential in abrasive flow machining.Comparing with other technological parameters,the model with diameter of 2mm,inlet velocity of 10m/s,turbulent kinetic energy of 0.4m2/s2,and turbulent dissipation rate of 19.8m2/s3 performs better in both axial and tangential velocity distribution and the turbulent kinetic energy distribution,which makes it feasible to reach a higher processing efficiency and a better surface texture pattern.The results of numerical simulation provide a theory basis for the further study of basic flow rules of softness abrasive flow.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2011年第3期334-339,共6页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50875242
50905163)
浙江省自然科学基金资助项目(Z107517
1090836)
关键词
流体体积模型
结构化表面
软性磨粒流
数值模拟
volume of fluid model（VOF）
structural surface
softness abrasive flow
numerical simulation
