Investigation of Coolant Fluid through Grinding Zone in High-Speed Precision Grinding  

作　　者：李长河 刘占瑞 毛伟平 蔡光起 

机构地区：[1]College of Mechanical Engineering,Qingdao Technological University [2]College of Mechanical Engineering & Automation,Northeastern University,Shenyang

出　　处：《Journal of Donghua University(English Edition)》2010年第1期87-91,共5页东华大学学报（英文版）

基　　金：National Natural Science Foundation of China(No.50875138);National Basic Research Program of China(No.2009CB724401);China Postdoctoral Science Foundation (No.20080431234);Natural Science Foundation of Shandong Province,China(No.Z2008F11);State Key Laboratory for Manufacturing Systems Engineering's Specialized Fund,China;the Specialized Construct Fund for Taishan Scholars,China

摘　　要：In the grinding process,grinding fluid is delivered for the purposes of chip flushing,cooling,lubrication,and chemical protection of the work surface.Due to the high-speed rotation of the grinding wheel,a boundary layer of air forms around the grinding wheel and moves most of the grinding fluid away from the grinding zone.Hence,the conventional method of delivering coolant fluid that floods delivery with high fluid pressure and nozzle fluid rare supply coolant fluid to achieve high performance grinding.The flood grinding typically delivering large volumes of grinding fluid is ineffective,especially under high speed grinding conditions.In the paper,a theoretical model is presented for flow of grinding fluid through the grinding zone in high-speed precision grinding.The model shows that the flow rate through the grinding zone between the wheel and the workpiece surface not only depends on wheel porosity and wheel speed,but also depends on nozzle volumetric flow rate and fluid jet velocity.Furthermore,the model is tested by a surface grinding machine in order to correlate between experiment and theory.Consequently,the useful flow-rate model is found to give a good agreement with the experimental results and the model can well forecast the useful flow-rate in high-speed precision grinding.In the grinding process, grinding fluid is delivered for the purposes of chip flushing, cooling, lubrication, and chemical protection of the work surface. Due to the high- speed rotation of the grinding wheel, a boundary layer of air forms around the grinding wheel and moves most of the grinding fluid away from the grinding zone. Hence, the conventional method of delivering coolant fluid that floods delivery with high fluid pressure and nozzle fluid rare supply coolant fluid to achieve high performance grinding. The flood grinding typically delivering large volumes of grinding fluid is ineffective, especially under high speed grinding conditions. In the paper, a theoretical model is presented for flow of grinding fluid through the grinding zone in high- speed precision grinding. The model shows that the flow rate through the grinding zone between the wheel and the workpiece surface not only depends on wheel porosity and wheel speed, but also depends on nozzle volumetric flow rate and fluid jet velocity. Furthermore, the model is tested by a surface grinding machine in order to correlate between experiment and theory. Consequently, the useful flow-rate model is found to give a good agreement with the experimental results and the model can well forecast the useful flow-rate in high-speed precision grinding.

关 键 词：GRINDING useful flow-rate boundary layer hydrodynamic pressure 

分 类 号：TG580[金属学及工艺—金属切削加工及机床] TH161.1[机械工程—机械制造及自动化]