材料本构参数对高速切削锯齿形切屑形成的数值分析
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摘要
基于正交切削模型分析了材料本构参数对高速切削锯齿形切屑的影响。研究发现:切削力和切削温度随材料本构参数值A、B、C和n呈线性变化;参数A和n对切屑形貌影响较大;参数B、C和m影响锯齿形切屑的曲率半径,若C≤0.01,m≥5,参数C和m对切屑形貌以及切削力和切削温度的影响可以忽略。工件材料硬度增加,A值增大,而n值减小;对于受应变率影响大的材料,C值较大;受温度影响大的工件,m值较小。本文结论为预测材料在不同硬度时本构参数值的变化,或根据材料本构参数值推断材料硬度值以及不同材料的固有属性差异性比较提供了参考。
In this paper,the influence of the material constitutive parameters on the serrated chip is analyzed based on the orthogonal cutting model in high speed machining. The results show that the cutting force and cutting temperature change linearly with the constitutive parameters A,B,C and n; The parameters A and n have great influence on the chip morphology,while the parameters B,C and m influence the curvature radius of serrated chip;However,the effects of the parameters C and m on the chip morphology,cutting force and cutting temperature can be ignored at C below 0. 01 and m above 5. The value of A increases with the increasing of hardness value and decreasing of n of workpiece. For materials depending on strain rate,value of C is larger; And for workpiece vulnerable to temperature,value of m is smaller. It can provide a guidance for predicting the variation of the material parameters under different hardness,inferring the material hardness value according to the material constitutive parameters and the comparison of material property difference.
In this paper,the influence of the material constitutive parameters on the serrated chip is analyzed based on the orthogonal cutting model in high speed machining. The results show that the cutting force and cutting temperature change linearly with the constitutive parameters A,B,C and n; The parameters A and n have great influence on the chip morphology,while the parameters B,C and m influence the curvature radius of serrated chip;However,the effects of the parameters C and m on the chip morphology,cutting force and cutting temperature can be ignored at C below 0. 01 and m above 5. The value of A increases with the increasing of hardness value and decreasing of n of workpiece. For materials depending on strain rate,value of C is larger; And for workpiece vulnerable to temperature,value of m is smaller. It can provide a guidance for predicting the variation of the material parameters under different hardness,inferring the material hardness value according to the material constitutive parameters and the comparison of material property difference.
引文
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[14]于静,董海,张弘弢,等.基于正交试验的高速切削淬硬模具钢的切削力研究[J].工具技术,2012,46(6):13-16Yu J,Dong H,Zhang H T,et al.Cutting force research in high-speed cutting hardened die steel on orthogonal experiment[J].Tool Engineering,2012,46(6):13-16(in Chinese)
[15]于静,赵琰巍,倪清泉,等.高速切削淬硬模具钢切屑形态的试验研究[J].工具技术,2013,47(1):58-61Yu J,Zhao Y W,Ni Q Q,et al.Tool wear experiment research in high-speed cutting hardened die steel[J].Tool Engineering,2013,47(1):58-61(in Chinese)
[16]Umbrello D,Rizzuti S,Outeiro J C,et al.Hardnessbased flow stress for numerical simulation of hard machining AISI H13 tool steel[J].Journal of Materials Processing Technology,2008,199(1-3):64-73
[17]Umbrello D,Caruso S,Rotella G.Hardness-based flow stress for numerical simulation of machining Inconel 718alloy[J].Key Engineering Materials,2012,504-506:1287-1292
[18]刘战强,吴继华,史振宇,等.金属切削变形本构方程的研究[J].工具技术,2008,42(3):3-9Liu Z Q,Wu J H,Shi Z Y,et al.State-of-the-art of constitutive equations in metal cutting operations[J].Tool Engineering,2008,42(3):3-9(in Chinese)
[2]Jiang Z H,Feng J L,Deng X Y.FEA simulation of the influence of cutting parameters on serrated chip formation in machining titanium alloy Ti-6Al-4V[J].Advanced Materials Research,2012,500:152-156
[3]Yang S C,Zheng M L,Zhang D Q,et al.Influence of cutting parameters on characteristics of serrated chip when high-efficiency cutting Ti6Al4V[J].Solid State Phenomena,2011,175:278-283
[4]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):179-186Wu M Y,Zhao X,Ji W,et al.Generation mechanism of saw-tooth chip in turning of GH4169 with PCBN tool[J].Journal of Mechanical Engineering,2016,52(3):179-186(in Chinese)
[5]Davoudinejad A,Chiappini E,Tirelli S,et al.Finite element simulation and validation of chip formation and cutting forces in dry and cryogenic cutting of Ti-6Al-4V[J].Procedia Manufacturing,2015,1:728-739
[6]臧健,赵军,李安海,等.导热系数对钛合金切削绝热剪切影响的有限元模拟[J].硬质合金,2016,33(3):181-187Zang J,Zhao J,Li A H,et al.The influence of coefficient of thermal conductivity on adiabatic shear during titanium alloy cutting based on finite element simulation[J].Cemented Carbide,2016,33(3):181-187(in Chinese)
[7]Baker M,Rosler J,Siemers C.The influence of thermal conductivity on segmented chip formation[J].Computational Materials Science,2003,26:175-182
[8]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
[9]Arrazola P J,Villar A,Ugarte D,et al.Serrated chip prediction in finite element modeling of the chip formation process[J].Machining Science and Technology,2007,11(3):367-390
[10]刘战强,张克国.J-C本构参数对绝热剪切影响的敏感性分析[J].航空学报,2011,32(11):2140-2146Liu Z Q,Zhang K G.Sensitivity analysis of JohnsonCook material constants on adiabatic shear[J].Acta Aeronautica et Astronautica Sinica,2011,32(11):2140-2146(in Chinese)
[11]Wang B,Liu Z Q.Shear localization sensitivity analysis for Johnson-Cook constitutive parameters on serrated chips in high speed machining of Ti6Al4V[J].Simulation Modelling Practice and Theory,2015,55:63-76
[12]Johnson G R,Cook W H.A constitutive model and data for metals subjected to large strains,high strain rates and high temperatures[C]//Proceedings of the 7th International Symposium on Ballistics.The Hague,Netherlands,1983
[13]付杰,王伏林.Cr12Mo V切削加工物理仿真与试验研究[J].现代制造工程,2014,(6):93-98Fu J,Wang F L.Physical simulation and experimental research on the cutting process of Cr12Mo V[J].Modern Manufacturing Engineering,2014,(6):93-98(in Chinese)
[14]于静,董海,张弘弢,等.基于正交试验的高速切削淬硬模具钢的切削力研究[J].工具技术,2012,46(6):13-16Yu J,Dong H,Zhang H T,et al.Cutting force research in high-speed cutting hardened die steel on orthogonal experiment[J].Tool Engineering,2012,46(6):13-16(in Chinese)
[15]于静,赵琰巍,倪清泉,等.高速切削淬硬模具钢切屑形态的试验研究[J].工具技术,2013,47(1):58-61Yu J,Zhao Y W,Ni Q Q,et al.Tool wear experiment research in high-speed cutting hardened die steel[J].Tool Engineering,2013,47(1):58-61(in Chinese)
[16]Umbrello D,Rizzuti S,Outeiro J C,et al.Hardnessbased flow stress for numerical simulation of hard machining AISI H13 tool steel[J].Journal of Materials Processing Technology,2008,199(1-3):64-73
[17]Umbrello D,Caruso S,Rotella G.Hardness-based flow stress for numerical simulation of machining Inconel 718alloy[J].Key Engineering Materials,2012,504-506:1287-1292
[18]刘战强,吴继华,史振宇,等.金属切削变形本构方程的研究[J].工具技术,2008,42(3):3-9Liu Z Q,Wu J H,Shi Z Y,et al.State-of-the-art of constitutive equations in metal cutting operations[J].Tool Engineering,2008,42(3):3-9(in Chinese)