摘要
提出一种基于软性磨粒流的模具结构化表面无工具精密光整加工新方法,通过在被加工的结构化表面附近配置约束模块,使结构化表面成为一条截面几何形状可设计的约束流道的内壁面,利用液固两相软性磨粒流在约束流道内的湍流壁面效应实现对约束流道内壁面的微力微量切削,从而克服光整加工工具难以接触结构化表面的困难,完成对结构化表面的无工具化精密光整加工。基于液固两相流体耦合理论,建立面向结构化表面精密加工的约束流道内液固两相磨粒流动力学模型,利用标准k-ε湍流模型和离散相模型相结合的求解方法,以环形截面约束流道为研究对象,选择不同的约束模块配合参数,对流道内压力/速度分布及湍流动能进行数值分析研究,通过该数值分析方法,可以观察约束流道进口压力、入口与出口截面尺寸的相对变化等工艺参数对湍流形态的影响,为研究软性磨粒流湍流形态调控的基本规律和磨粒流特性提供一种理论工具。
A new mould structural surface no-tool precision finish machining method based on soft abrasive flow is brought forward. By installing constraint module at nearby the structured surface to be machined, the surface becomes a configurable restrained flow channel （RFC）. Micro force and micro amount cutting for RFC is realized by using the turbulence wall effect of liquid-solid two-phase soft abrasive flow in RFC. It will overcome the difficulty of the polishing tool to contact the structured surface and accomplish the no-tool precision machining of the structured surface. Dynamical model of soft abrasive flow in RFC oriented to structured surface precision machining is established on the basis of liquid-solid two-phase flow coupling theory. Choosing corresponding conjunction parameters of different constraint modules, annular constriant flow channel is taken as the research object, and its pressure/velocity distribution and turbulent kinetic energy are analyzed by using standard k-ε turbulent model and discrete phase model. The influence of relative variation of inlet/outlet conditions on the turbulent flow pattern can be inspected through the numerical analysis, thus providing a theoretical tool for the research of the basic law of soft abrasive flow form control and the abrasive flow characteristics.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第15期178-184,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(50875242)
浙江省自然科学基金重点(Z107517)资助项目
关键词
结构化表面
精密光整加工
软性磨粒流
数值模拟
Structural surface Precision finish machining Soft abrasive flow Numerical simulation
