纳米硬质合金刀具切削Al-SiC_p复合材料的实验
第18卷第2期2010年2月
光学精密
0pticsandPrecision
工程
Engineering
V01.18No.2
Feb.2010
文章编号1004—924X(2010)02—0406—06
纳米硬质合金刀具切削Al/SiCp复合材料的实验
郐吉才1,张飞虎2
(1.河南理工大学机械与动力工程学院,河南焦作454000;
2.哈尔滨工业大学机电学院,黑龙江哈尔滨150001)
摘要:针对SiC颗粒硬度高,切削AI/SiC,复合材料时刀具磨损剧烈,本文提出用具有较高硬度、韧性及良好抗磨损能力的WC-7Co制备纳米硬质合金刀具,并对A1/SiC,复合材料进行了切削实验。研究了纳米硬质合金刀具磨损机理和AI/SiC。复合材料的切屑去除机理,以及刀尖处后刀面磨损值。研究认为,纳米硬质合金刀具磨损的机理为SiC颗粒的微切削作用引起的磨料磨损,及SiC颗粒对刀尖刃El的高频、断续冲击引起的微崩刃及微破损;A1/SiC,复合材料的切削实质是断续切削;去除机理为切屑的崩碎去除;纳米硬质合金后刀面磨损值较普通硬质合金小30%~50%。实验表明,纳米硬质合金较普通硬质合金更适于加工M/SiC。复合材料。
关键词:纳米硬质合金;A1/SiC。复合材料;磨损机理;断续切削
中圈分类号:TG729:TG506.7文献标识码:A
ExperimentsofcuttingAI/SiCp
compositewithnanocementedcarbidetool
KUAIJi—cai。ZHANGFei—hu
(1.Schoolo.厂MechanicalandPowerEngineering,HenanPolytechnic
University,]iaozuo454000,China;2.CollegeofMechanicalEngineering,
HarbinInstituteofTechnology,Harbin150001,China)
Abstract:ThetoolcanbewornseriouslywhenA1/SiCpcompositeismachinedduetotheSiCparticleswithahigherhardness.Basedonthenewnano—cementedcarbidecharacterizedbyhishighhardness,toughness,flexuralstrengthandhigherwearresistingproperty,a
WC一7Conanocementedcarbidetoolwasprepared,andthecuttingexperimentwascarriedout.Thewearmechanismofnanocementedcar—bidetOOIandchipremovalmechanismwerestudied.ResultsshowthatthewearmechanismofnanocementedcarbidetoolisanabrasionwearduetOthemicro?-cuttingofSiCparticlesandthemicro。‘chip‘-pingandmicro—breakageofcuttingedgecausedbyinterruptedimpactoftheSiCparticlesunderthehighfrequency.TheessenceofcuttingA1/SiCPisinterruptedcutting,andtheA1/SiCpchipremovalisthebreakoutofchip.Experimentindicatesthattheflankwearvalueofnanocementedcarbidetoolisa—bout30%一50%lessthanthatofcommoncementedcarbide,whichmeansnanocementedcarbideiS
收稿日期:2009—09—05:修订日期:2009—11一05.
基金项目:河南理工大学博士基金资助项目
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