TC4盘铣开槽加工变质层实验研究
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摘要
设计三因素三水平TC4盘铣开槽正交实验,DEWESOFT独立多功能测试系统同时采集切削力和切削温度信号,为加工表面状态改变提供基本理论依据, 600 MRD数显洛式硬度计进行显微硬度测量,莱卡S6D显微镜进行金相组织分析,研究TC4盘铣表面变质层规律及工艺参数对变质层的影响规律。针对表面残余应力研究发现,盘铣TC4表面均为压应力,主要由铣削加工过程中后刀面与工件摩擦产生的挤光效应引起。针对表层显微硬度及显微组织研究发现,不同工艺参数加工表面发生了严重的拉伸变形,微观组织由初始等轴组织α相转变为α+β双态组织或魏氏组织,使材料硬度增大。试验结果表明:各因素对变质层的影响程度依次为铣削速度>切削深度>进给速度,变质层随着铣削速度的增大逐渐减小,随着切削深度和进给速度的增大逐渐增大。
Three factors three levels orthogonal experiment of TC4 disc milling grooving is designed. The signal of milling force and milling temperature are measured by DEWESOFT test system, which provide the basis to the change of the machined surface states. The microhardness is measured by digital display Rockwell hard-tester 600 MRD, the microstructure is detected by S6 D4 microscope. Research on affected-layer rule and influence on affected-layer of technological parameters are conducted on. It is found that the surface of disc-milling are all compressive stress, mainly are generated by burnishing effect, which is produced by friction between flank face and workpiece during processing. In addition, through the research on surface microhardness and microstructure, machining surface of various technological parameters occurs serious tensile deformation, micostructure changes in α+β bimodal structure or widmannstatted structure from equimannstatten structure, which makes material hardness increases. The experimental results shows that the successive impact factors for affected layer are cutting speed>cut depth>feed speed respectively.
Three factors three levels orthogonal experiment of TC4 disc milling grooving is designed. The signal of milling force and milling temperature are measured by DEWESOFT test system, which provide the basis to the change of the machined surface states. The microhardness is measured by digital display Rockwell hard-tester 600 MRD, the microstructure is detected by S6 D4 microscope. Research on affected-layer rule and influence on affected-layer of technological parameters are conducted on. It is found that the surface of disc-milling are all compressive stress, mainly are generated by burnishing effect, which is produced by friction between flank face and workpiece during processing. In addition, through the research on surface microhardness and microstructure, machining surface of various technological parameters occurs serious tensile deformation, micostructure changes in α+β bimodal structure or widmannstatted structure from equimannstatten structure, which makes material hardness increases. The experimental results shows that the successive impact factors for affected layer are cutting speed>cut depth>feed speed respectively.
引文
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[16] Moussaoui Kamel,Mousseigne Michel,Senatore Johanna,et al.Influence of milling on surface integrity of Ti-6Al-4V [J].Diffusion and Defect Data Pt B:Solid State Phenomena,2013,201:127-136.
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[18] Wang M H,Liu Z H,Wang H J,et al.Study on residual stress for high-speed cutting titanium alloy based on finite element method [J].Advanced Materials Research,2011,188:216-219.
[19] 吴红兵,刘刚,柯映林,等.钛合金的已加工表面残余应力的数值模拟 [J].浙江大学学报(工学版),2007,41,(8):1389-1393.
[20] 唐志涛,刘战强,艾兴.高速铣削加工铝合金表面残余应力研究 [J].中国机械工程,2008,19(6):699-703.
[2] Chen-Haron C H.Tool life and surface integrity in turning titanium alloy [J].Journal of Materials Processing Technology,2001,118(1/3):231-237.
[3] Chen Haron C,Jawaid A.The effect of machining on surface integrity of titanium alloy Ti-6%Al-4%V [J].Journal of Materials Processing Technology,2005,166(2):188-192.
[4] Ge Yingfei,Fu Yucan,Xu Jinhua.Experimental study on high speed milling of γ-Ti-Al alloy [J].Key Engimeering Materials,2007,339:6-10.
[5] 耿国胜.钛合金高速铣削技术的基础研究 [D].南京:南京航空航天大学,2006.
[6] 杜随更,吕超,任军学,等.钛合金TC4高速铣削表面形貌及表层组织研究 [J].航空学报,2008,29(6):1710-1715.
[7] 杨振朝,张定华,姚昌峰,等.TC4钛合金高速铣削参数对表面完整性影响研究 [J].西北工业大学学报,2009,27(4):538-543.
[8] 杨振朝,张定华,姚昌峰,等.高速铣削速度对TC4钛合金表面完整性影响机理 [J].南京航空航天学报,2009,41(5):644-648.
[9] Sridhar B R,Devananda G,Ramachandra,et al.Effect of machining parameters and heat treatment on the residual stress in titanium alloy IMI-834[J].Journal of Materials Processing Technology,2003,139:628-634.
[10] Yao Changfeng,Yang Zhenchao,Huang Xinchun,et al.The study of residual stress in high-speed milling of titanium alloy TC11 [J].Advanced Materials Research,2012,443-444:160-165.
[11] Dayri A,Boujebene M,Bayraktar E,et al.Influence of feed rate on surface integrity of titanium alloy in high speed milling [J].Advanced Materials Research,2011,264-265:1228-1233.
[12] Wu Daoxia,Yao Changfeng,Tan Liang,et al.Experiment study on surface integrity in high speed milling of titanium alloy TB6 [J].Applied Mechanics and Material,2013,328:867-871.
[13] Yang Zhenchao,Zhang Dinghua,Yao Changfeng,et al.Surface integrity in high-speed milling of titanium alloy TC11 [J].2010 International Conference on Mechanic Automation and Control Engineering,2010:3334-3337.
[14] Daymi A,Boujelbene M,Ben Amara A,et al.Surface integrity in high speed end milling of titanium alloy Ti-6Al-4v [J].Material Science and Technology,2011,27(1):387-394.
[15] Yang Xiaoyang,Ren Chengzu,Wang Yand,et al.Experimental study on surface integrity of Ti-6Al-4v in high speed side milling [J].Transactions of Tianjin University,2012,18(3):206-212.
[16] Moussaoui Kamel,Mousseigne Michel,Senatore Johanna,et al.Influence of milling on surface integrity of Ti-6Al-4V [J].Diffusion and Defect Data Pt B:Solid State Phenomena,2013,201:127-136.
[17] Rao Barkshna,Dandekar Chinmaya R,Shin Yung C,et al.An experimental and numerical study on the face milling of Ti-6Al-4V alloy:tool performance and surface integrity [J].Journal of Material Processing Technology,2011,211(2):294-304.
[18] Wang M H,Liu Z H,Wang H J,et al.Study on residual stress for high-speed cutting titanium alloy based on finite element method [J].Advanced Materials Research,2011,188:216-219.
[19] 吴红兵,刘刚,柯映林,等.钛合金的已加工表面残余应力的数值模拟 [J].浙江大学学报(工学版),2007,41,(8):1389-1393.
[20] 唐志涛,刘战强,艾兴.高速铣削加工铝合金表面残余应力研究 [J].中国机械工程,2008,19(6):699-703.