高效磨削用热管砂轮传热性能试验研究
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摘要
针对高强韧性难加工材料因磨削高温导致加工效率低、工件表面易出现热损伤的问题,提出了利用热管技术提高砂轮自身传热能力以增强对磨削弧区的换热效果,进而实现降低磨削温度的新方法.在此基础上,基于热管砂轮的结构与传热原理,设计并建立了一套用于测试热管砂轮传热性能的试验装置和方法,分析了砂轮速度、工质属性、热端热流输入强度、冷端散热条件和液膜厚度各因素对热管砂轮传热能力以及传热启动特性的影响规律.试验结果表明,热管砂轮能够显著增强对磨削弧区的换热效果,此外,该装置和方法可准确评估各因素对热管砂轮传热性能的影响,且适于预测热管砂轮的传热能力.
According to the problems of low machining efficiency and thermal damage caused by high grinding temperature for difficult-to-cut materials with high strength and toughness,a new method of improving heat transfer capacity of grinding wheel by virtue of heat pipe technology was proposed to enhance heat exchange at the contact zone and avoid high grinding temperature.On the basis of the structure of heat pipe grinding wheel and its heat transfer principle,experimental device and test method were designed and set up to investigate the heat transfer performance of heat pipe grinding wheel.Moreover,the effects of wheel speed,working fluid property,heat flux input at the evaporator,cooling condition at the condenser and liquid film thickness on heat transfer capacity and starting characteristic of heat pipe grinding wheel were analyzed.The results show that heat pipe grinding wheel can significantly increase heat exchange at the contact zone.Besides,the test method for heat pipe grinding wheel can accurately evaluate the effects of various factors on its heat transfer performance and is suitable for prediction of its heat transfer capacity.
According to the problems of low machining efficiency and thermal damage caused by high grinding temperature for difficult-to-cut materials with high strength and toughness,a new method of improving heat transfer capacity of grinding wheel by virtue of heat pipe technology was proposed to enhance heat exchange at the contact zone and avoid high grinding temperature.On the basis of the structure of heat pipe grinding wheel and its heat transfer principle,experimental device and test method were designed and set up to investigate the heat transfer performance of heat pipe grinding wheel.Moreover,the effects of wheel speed,working fluid property,heat flux input at the evaporator,cooling condition at the condenser and liquid film thickness on heat transfer capacity and starting characteristic of heat pipe grinding wheel were analyzed.The results show that heat pipe grinding wheel can significantly increase heat exchange at the contact zone.Besides,the test method for heat pipe grinding wheel can accurately evaluate the effects of various factors on its heat transfer performance and is suitable for prediction of its heat transfer capacity.
引文
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[2]AURICH J C,KIRSCH B.Improved coolant supply through slotted grinding wheel[J].CIRP AnnalsManufacturing Technology,2013,62(1):363-366.
[3]霍文国,徐九华,傅玉灿,等.自润滑金属结合剂CBN砂轮干式磨削特性分析[J].中国机械工程,2012,23(23):2773-2777.HUO Wenguo,XU Jiuhua,FU Yucan,et al.Characteristic analysis of self-lubricantion metal bonded CBN wheel during dry grinding[J].China Mechanical Engineering,2012,23(23):2773-2777.
[4]PAL B,CHATTOPADHYAY A K,CHATTOPADHYAY A B.Development and performance evaluation of monolayer brazed cBN grinding wheel on bearing steel[J].International Journal of Advanced Manufacturing Technology,2010,48(9-12):935-944.
[5]LIANG L,QUAN Y M,KE Z Y.Investigation of tool-chip interface temperature in dry turning assisted by heat pipe cooling[J].International Journal of Advanced Manufacturing Technology,2011,54(1-4):35-43.
[6]马可.基于热管技术的磨削弧区强化换热基础研究[D].南京:南京航空航天大学机电学院,2011.
[7]赫青山,傅玉灿,徐鸿钧,等.TC4钛合金高效磨削加工用环形热管砂轮的研制[J].航空学报,2013,34(7):1740-1747.HE Qingshan,FU Yucan,XU Hongjun,et al.Development of annular heat pipe grinding wheel for high efficiency machining of TC4titanium alloy[J].Acta Aeronautica et Astronautica Sinica,2013,34(7):1740-1747.
[8]HE Q S,FU Y C,XU H J,et al.Investigation of a heat pipe cooling system in high-efficiency grinding[J].International Journal of Advanced Manufacturing Technology,2014,70(5/8):833-842.