干切削机床压缩空气冷却系统热力学模型及热平衡调控方法
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摘要
在大批量干切削加工中,通常使用压缩空气对切削区进行冷却。为解决干切削机床的热平衡问题,提出一种干切削机床压缩空气冷却系统热力学模型及热平衡控制方法。建立了喷嘴出口处压缩空气的温度、速度及质量流量与压缩空气冷却系统及环境相关参量的热力学关系模型,进一步建立了干切削机床热平衡模型,然后以压缩空气的温度、质量流量及供给时间为调控变量,对干切削机床的热平衡调控方法进行了研究。以高速干切滚齿机床为例进行了验证,结果表明,该方法可有效保证在持续加工时干切削机床加工内区域的温度变化在可控范围内。
In dry cutting mass production, the cold compressed air is used to cool the cutting zone. A thermodynamic model of air cooling system and a heat balance control method of dry cutting machine tool are presented, in order to solve the heat balance problem of dry cutting machine tool. The relation between thermodynamics parameters of compressed air at nozzle exit and parameters of air cooling system is analysed. Furthermore, the heat balance model of dry cutting machine tool is established. Based on it, a heat balance control method of dry cutting machine tool, which is realized with regulating the thermodynamics parameters and supply duration of compressed air, is proposed. Experiment on dry hobbing machine tool, shows that the proposed method can makes temperature of machine tool components fluctuated in an acceptable range.
In dry cutting mass production, the cold compressed air is used to cool the cutting zone. A thermodynamic model of air cooling system and a heat balance control method of dry cutting machine tool are presented, in order to solve the heat balance problem of dry cutting machine tool. The relation between thermodynamics parameters of compressed air at nozzle exit and parameters of air cooling system is analysed. Furthermore, the heat balance model of dry cutting machine tool is established. Based on it, a heat balance control method of dry cutting machine tool, which is realized with regulating the thermodynamics parameters and supply duration of compressed air, is proposed. Experiment on dry hobbing machine tool, shows that the proposed method can makes temperature of machine tool components fluctuated in an acceptable range.
引文
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[16]YANG X,CAO H J,CHEN Y P,et al.An analytical model of chip heat-carrying capacity for high-speed dry hobbing based on 3D chip geometry[J].International Journal of Precision Engineering&Manufacturing,2017,18(2):245-256.
[2]ABDELALI H B,CLAUDIN C,RECH J,et al.Experimental characterization of friction coefficient at the tool-chip-workpiece interface during dry cutting of AISI1045[J].Wear,2012,s 286-287(11):108-115.
[3]杨潇,曹华军,陈永鹏,等.高速干切滚齿工艺系统切削热全过程传递模型[J].机械工程学报,2015,51(19):189-196.YANG Xiao,CAO Huajun,CHEN Yongpeng,et al.Whole process cutting heat transfer model for high-speed dry hobbing[J].Journal of Mechanical Engineering,2015,51(19):189-196.
[4]WAN M,ZHANG W H,QIN G H,et al.Efficient calibration of instantaneous cutting force coefficients and runout parameters for general end mills[J].International Journal of Machine Tools&Manufacture,2007,47(11):1767-1776.
[5]曹华军,李先广,陈鹏.绿色高速干切滚齿工艺理论与关键技术[M].重庆:重庆大学出版社,2016.CAO Huajun,LI Xianguang,CHEN Peng.Process theory and key technology of green high-speed dry hobbing[M].Chongqing:Chongqing University Press,2016.
[6]ARUMUGAM P U,MALSHE A P,BATZER S A.Dry machining of aluminum-silicon alloy using polished CVDdiamond-coated cutting tools inserts[J].Surface&Coatings Technology,2006,200(11):3399-3403.
[7]JOZI?S,BAJI?D,CELENT L.Application of compressed cold air cooling:Achieving multiple performance characteristics in end milling process[J].Journal of Cleaner Production,2015,100:325-332.
[8]PUSAVEC F,KRAJNIK P,KOPAC J.Transitioning to sustainable production-Part I:Application on machining technologies[J].Journal of Cleaner Production,2010,18(2):174-184.
[9]CAO H,ZHU L,LI X,et al.Thermal error compensation of dry hobbing machine tool considering workpiece thermal deformation[J].International Journal of Advanced Manufacturing Technology,2016,86:1739-1751.
[10]SCHINDLER S,ZIMMERMANN M,AURICH J C,et al.Thermo-elastic deformations of the workpiece when dry turning aluminum alloys-A finite element model to predict thermal effects in the workpiece[J].Cirp Journal of Manufacturing Science&Technology,2014,7(3):233-245.
[11]ENGINEERS RA.ASHRAE handbook:fundamentals[M].Atlanta,USA:ASHRAE,2009.
[12]MORAN M J,SHAPIRO H N.Fundamentals of engineering thermodynamics[M].New York:J.Wiley,1998.
[13]LIBRARY W E.American society of heating,refrigerating and air-conditioning engineers[J].International Journal of Refrigeration,1979,2(3):56-57.
[14]LEMMON E W,HUBER M L,MCLINDEN M O.NISTstandard reference database 23:Reference fluid thermodynamic and transport properties-REFPROP.9.0.[EB/OL].(2013-05-07).https://ws680.nist.gov/publication/get_pdf.cfm?pub_id=912382
[15]ZHU L,CAO H,ZENG D,et al.Multi-variable driving thermal energy control model of dry hobbing machine tool[J].International Journal of Advanced Manufacturing Technology,2017,92:259-275.
[16]YANG X,CAO H J,CHEN Y P,et al.An analytical model of chip heat-carrying capacity for high-speed dry hobbing based on 3D chip geometry[J].International Journal of Precision Engineering&Manufacturing,2017,18(2):245-256.