光滑表面磨削区流体动压力的建模与实验验证  

Hydrodynamic Pressure Modeling and Experimental Verification of Grinding Zone between Smooth Surfaces

作　　者：张强[1] 李长河[1] 王胜[1] 

机构地区：[1]青岛理工大学机械工程学院,山东青岛266033

出　　处：《组合机床与自动化加工技术》2013年第10期24-27,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金资助项目(51175276)

摘　　要：基于流体动压润滑理论,考虑了磨削区流体为层流和湍流的流动状态,建立了浇注式供液方式下光滑表面间磨削区流体动压力的数学模型。在平面磨床上进行了流体动压力的实验研究,实验结果表明,当磨削区内流体的雷诺数小于300时,光滑表面间层流状态的流体动压力模型可靠地预测了磨削区内流体的动压力;当300<Re<1500时,Ng and Pan的湍流模型理论值大于实验值,而Hirs的湍流模型的理论值与实验值较吻合;磨削区流体动压力随着砂轮速度的增加、最小间隙的减小而增大,最大压力峰值分布在砂轮工件最小间隙区域,且在该区域压力梯度变化明显。Considering laminar and turbulent flow of the fluid in grinding zone,the hydrodynamic pressure model of grinding zone w ith flood delivery for smooth surfaces w as established based on hydrodynamic lubrication theory.Experimental Study of the hydrodynamic pressure w as conducted on the surface grinder,the experimental results show that for the smooth surfaces,the hydrodynamic pressure equation of laminar flow s reliably predicts the hydrodynamic pressure of the grinding zone if the Reynolds number Re is low er than about 300;While 300 Re 1500,the theoretical value of the turbulence model of Ng and Pan is greater than the experimental values,but the turbulent model of Hirs agrees w ith the experimental results;The hydrodynamic pressure of the grinding zone is increased w ith the increase of the w heel speed and the reduction of the minimum gap and the peak pressure is generated just in the minimum clearance region in w hich the higher pressure gradient occurs.

关 键 词：磨削 浇注式供液 流体动压力 光滑表面 层流 湍流 

分 类 号：TH16[机械工程—机械制造及自动化] TG580[金属学及工艺—金属切削加工及机床]