高压冷却下锯齿形切屑几何表征试验
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摘要
理论分析了锯齿化程度、锯齿化频率与锯齿化步距等几何表征模型;在高压冷却条件下进行了聚晶立方氮化硼(PCBN)刀具切削GH4169镍基高温合金试验,并对不同切削用量与冷却液压力下的切屑进行试样制备及抛磨,以分析锯齿形切屑的形貌及表征;分析了不同切削参数下锯齿形切屑几何表征的变化规律。试验结果表明:随着切削速度、进给量和背吃刀量的增大,切屑的锯齿化程度和锯齿化步距增大,而锯齿化频率减小;随着冷却液压力的增大,切屑的锯齿化程度降低,锯齿化频率增大,锯齿化步距先增大后减小;在高压冷却条件下切屑的断屑能力得到了提高,且随着冷却液压力的增大,断屑效果进一步提高。
The theoretical models of geometrical characterization were analyzed,including segmented degree,serration frequency and serration step pitch.The cutting tests of GH4169nickel-based superalloy was carried out with PCBN tools under high-pressure cooling,and the chips were prepared and polished to analyze the morphology and geometrical characterization of serrated chips under different conditions of cutting parameters and coolant pressures.The change laws of geometrical characterization of serrated chips were analyzed under different cutting parameters.The experimental results show that with the increases of cutting speeds,feed rates and cutting depths,the segmented degree and the serration step pitch of chips increase,on the contrary,the serration frequency of chips decreases.With the increases of coolant pressures,the segmented degree of chips decreases,the serration frequency of chips increases,and the serration step pitch firstly increases and then decreases.The chip breaking ability of the chips is improved under high pressure cooling,and the chip breaking effectiveness further improves as the coolant pressure increases.
The theoretical models of geometrical characterization were analyzed,including segmented degree,serration frequency and serration step pitch.The cutting tests of GH4169nickel-based superalloy was carried out with PCBN tools under high-pressure cooling,and the chips were prepared and polished to analyze the morphology and geometrical characterization of serrated chips under different conditions of cutting parameters and coolant pressures.The change laws of geometrical characterization of serrated chips were analyzed under different cutting parameters.The experimental results show that with the increases of cutting speeds,feed rates and cutting depths,the segmented degree and the serration step pitch of chips increase,on the contrary,the serration frequency of chips decreases.With the increases of coolant pressures,the segmented degree of chips decreases,the serration frequency of chips increases,and the serration step pitch firstly increases and then decreases.The chip breaking ability of the chips is improved under high pressure cooling,and the chip breaking effectiveness further improves as the coolant pressure increases.
引文
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[2]王殿龙,荀志锋,庞继有,等.K24镍基高温合金切削性能试验研究[J].机械工程学报,2002,38(增刊1):190-193.WANG Dianlong,XUN Zhifeng,PANG Jiyou,et al.An Investigation of the Machinability of K24Nickel-based Superalloy[J].Journal of Mechanical Engineering,2002,38(S1):190-193.
[3]程剑兵,庞思勤,王西彬,等.硬质合金刀具车削GH2132高温合金磨损及破损试验[J].北京理工大学学报,2013,33(9):911-915.CHENG Jianbing,PANG Siqin,WANG Xibin,et al.Wear and Breakage Lifespan Study of Ultrafinegrained Hardmetals Tool for Turning GH2132Superalloy[J].Transaction of Beijing Institute of Technology,2013,33(9):911-915.
[4] KHAN S A,SOO S L,ASPINWALL D K,et al.Tool Wear/Life Evaluation When Finish Turning Inconel 718 Using PCBN Tooling[J].Procedia CIRP,2012,1:283-288.
[5] BUSHLYA V,ZHOU J,AVDOVIC P,et al.Performance and Wear Mechanisms of Whisker-reinforced Alumina,Coated and Uncoated PCBN Tools When High-speed Turning Aged Inconel 718[J].The International Journal of Advanced Manufacturing Technology,2013,66(9/12):2013-2021.
[6]何耿煌,李凌祥,邹伶俐,等.亚微观倒棱切削刃对硬质合金刀片切削性能的影响特性研究[J].金刚石与磨料磨具工程,2017,37(3):46-54.HE Genghuang,LI Lingxiang,ZOU Lingli,et al.Influencing Characteristic of Submicroscopic Chamfering Cutting Edge on the Cutting Property of Cemented Carbide Insert[J].Diamond&Abrasives Engineering,2017,37(3):46-54.
[7]庆振华,左敦稳,杨海东,等.弹簧式快速落刀研究硬态42CrMo锯齿形切屑[J].中国机械工程,2016,27(3):308-314.QING Zhenhua,ZUO Dunwen,YANG Haidong,et al.Research on Hardened 42CrMo Saw-tooth Chip by Trial with Spring Type Quick-stop Device[J].China Mechanical Engineering,2016,27(3):308-314.
[8]吴明阳,赵旭,计伟,等.PCBN刀具切削高温合金锯齿形切屑形成机理[J].机械工程学报,2016,52(3):179-186.WU Mingyang,ZHAO Xu,JI Wei,et al.Generation Mechanism of Saw-tooth Chip in Turning of GH4169with PCBN Tool[J].Journal of Mechanical Engineering,2016,52(3):179-186.
[9] ARRAZOLA P J,BARBERO O,URRESTI I.Influence of Material Parameters on Serrated Chip Prediction in Finite Element Modeling of Chip Formation Process[J].International Journal of Material Forming,2010,3(S1):519-522.
[10]杨奇彪,陈鹏,游达章,等.高速切削Ti6Al4V锯齿形切屑形成的表征[J].机床与液压,2014,42(6):70-73.YANG Qibiao,CHEN Peng,YOU Dazhang,et al.Characteristics of Serrated Chip Formation in High Speed Machining Ti6Al4V[J].Machine Tool&Hydraulics,2014,42(6):70-73.
[11]曹自洋,何宁,李亮,等.高速切削钛合金Ti6Al4V切屑的形成及其数值模拟[J].中国机械工程,2008,19(20):2450-2454.CAO Ziyang,HE Ning,LI Liang,et al.Chip Formation and Its Numerical Simulation in High Speed Cutting of Ti6Al4V Alloy[J].China Mechanical Engineering,2008,19(20):2450-2454.
[12]李亭亭,李嫚,张弘弢.加工镍基高温合金切屑塑性侧流实验研究[J].金刚石与磨料磨具工程,2012,32(4):60-63.LI Tingting,LI Man,ZHANG Hongtao.Experimental Research on Chip Plastic Side Flow When Turning Nickel-based Superalloy[J].Diamond&Abrasives Engineering,2012,32(4):60-63.
[13]赵旭.高压冷却下PCBN刀具切削镍基高温合金切屑形成与折断机理[D].哈尔滨:哈尔滨理工大学,2017.ZHAO Xu.Mechanism of Chip Formation and Fracture of PCBN Cutting High Temperature Alloy under High-pressure Cooling[D].Harbin:Harbin University of Science and Technology,2017.
[14] VAGNORIUS Z S K.Effect of High-pressure Cooling on Life of SiAlON Tools in Machining of Inconel 718[J].The International Journal of Advanced Manufacturing Technology,2011,54(1):83-92.
[15] DUAN Chunzheng,ZHANG Liangchi.A Reliable Method for Predicting Serrated Chip Formation in High-speed Cutting:Analysis and Experimental Verification[J].International Journal of Advanced Manufacturing Technology,2013,64(9/12):1587-1597.
[16]段春争,王肇喜,李红华.高速切削锯齿形切屑形成过程的有限元模拟[J].哈尔滨工程大学学报,2014,35(2):226-232.DUAN Chunzheng,WANG Zhaoxi,LI Honghua.Finite Element Simulation of the Formation Process of a Serrated Chip in High-speed Cutting[J].Journal of Harbin Engineering University,2014,35(2):226-232.
[17] SCHULZ H,ABELEB E,SAHM A.Material Aspects of Chip Formation in HSC Machining[J].CIRP Annals—Manufacturing Technology,2001,50(1):45-48.
[18] EKINOVIC S,BEGOVIC E.An Approach to Determine Transition Area from Conventional to High-speed Machining by Means of Chip Shape Analysis[J].Achieves of Materials Science,2007,28(1/4):35-39.
[19]刘献礼.聚晶立方氮化硼刀具及其应用[M].哈尔滨:黑龙江科学技术出版社,1999:128-129.LIU Xianli.Polycrystalline Cubic Boron Nitride Tool and Its Application[M].Harbin:Heilongjiang Science and Technology Press,1999:128-129.