气固两相磨粒流对刀具刃口钝化的数值模拟
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摘要
刀具刃口钝化通过消除刃区结构的微观缺陷,改变切削刃的微观形貌,以得到延长刀具的使用寿命,提高刀具的切削性能,改善已加工零件的表面质量的目的。文章采用计算机流体动力学理论和冲蚀磨损理论相结合,采用流体软件Fluent和离散元EDEM,基于standard k-ε湍流模型和Hertz-Mindlin with Archard Wear磨损模型,建立了刀具在气固两相流内钝化的仿真模型,研究了刀具刃口钝化速度和钝化时间对磨粒速度、刀具磨损量和刀具累积能量的影响规律,为高速高效钝化奠定基础。
Tool edge preparation prolongs the service life of tool and elevates the processing surface quality and cutting performance through modifying the cutting edge contour and microstructure. In this paper,based on the theory of computer hydrodynamics and the theory of erosion and abrasion and the standard k-ε turbulence model and the Hertz-Mindlin with Archard Wear wear model, a simulation model of tool edge preparation in gas-solid two-phase flow is established by using the fluid software Fluent and the discrete element EDEM,. The effects of tool preparation speed and preparation time on abrasive velocity, tool wear and tool cumulative energy were studied, which laid a foundation for high speed and high efficiency preparation.
Tool edge preparation prolongs the service life of tool and elevates the processing surface quality and cutting performance through modifying the cutting edge contour and microstructure. In this paper,based on the theory of computer hydrodynamics and the theory of erosion and abrasion and the standard k-ε turbulence model and the Hertz-Mindlin with Archard Wear wear model, a simulation model of tool edge preparation in gas-solid two-phase flow is established by using the fluid software Fluent and the discrete element EDEM,. The effects of tool preparation speed and preparation time on abrasive velocity, tool wear and tool cumulative energy were studied, which laid a foundation for high speed and high efficiency preparation.
引文
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[11] 侯亚娟.基于离散元与有限元耦合的大型球磨机衬板性能研究[D].长春:吉林大学,2015.
[2] Barletta M,Gisario A,Venettacci S,et al.A comparative evaluation of fluidized bed assisted drag finishing and centrifugal disk dry finishing[J].Engineering Science & Technology An International Journal,2014,17(2):63-72.
[3] Sooraj V S,Radhakrishnan V.A study on fine finishing of hard workpiece surfaces using fluidized elastic abrasives[J].International Journal of Advanced Manufacturing Technology,2014,73(9-12):1495-1509.
[4] C Schmiedel,J Wendler.CFD simulation of the abrasive flow machining process [J].Procedia CIRP,2015,31:209- 214.
[5] Riber E,Moureau V,GarciaM,et al.Evaluation of numerial strategies for large eddy simulation of particulate two-phase recirculating flows[J].Journal of Computational Physics,2009,228(2):539-564.
[6] Wu Chunliang,BerrouA S,Nandakumar K.Three-dimensional discrete particle model for gas-solid fluidized beds on unstructured mesh[J].Chemical Engineering Journal,2009,152( 2 /3) :514-529.
[7] Zhu H,Pan Q,Zhang W,et al.CFD simulations of flowerosion and flow induced deformation of needle valve:Effects of operation,structure and fluid parameters[J].Nuclear Engineering and Design,2014,273:396-411.
[8] 刘立意,郝世杨,张萌,等.基于CFD-DEM的稻谷通风阻力数值模拟与试验[J].农业机械学报,2015,46(8):27-32,158.
[9] 杜俊,胡国明,方自强,等.弯管稀相气力输送CFD-DEM法数值模拟[J].国防科技大学学报,2014,36(4):134-139.
[10] 王宇,何琪,于飞,等.组合弯头内气固两相流动磨损特性的数值模拟与结构优化[J].中国电机工程学报,2018,38(3):832-839.
[11] 侯亚娟.基于离散元与有限元耦合的大型球磨机衬板性能研究[D].长春:吉林大学,2015.