石墨切削机理研究

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1、广东工业大学硕士学位论文石墨切削机理研究姓名：付昊申请学位级别：硕士专业：机械制造及其自动化指导教师：王成勇20060601三圣三些奎茎三耋竺圭兰堡丝圣ABSTRACTGrap硫e，owingtoitslowerdectmdewe虬quickerEDMspeed，hig确rheatresistaⅡceandbefteI。machj丑jnga∞l工rac弘has酆dua玎ysubstjtutedforc叩pcrasthemajorelectrodematerialinEDM·碰gh—speedmachiningistll

2、emainmemodfor静aphiteeleccrodetogethi曲ersurface觚shaIldc叭ingaccllracy．Becauseit’stypicalbrittleness，伊aphiteelectrodecallbeeasilycrackedbycuttingiIIlpact．Atpresent，hi曲一speedmachin啦iswidelyad叩tedin铲aphjteelectrodemachiningjndustry．Graphitebi曲_speedmacb_i11ingcausesr

3、apjdtoolwearandsevereworkedge出pping．ItisValuableandiInponanttofesea础graphitecIlttingmechanism．Becauseofrapidcuttingspeedandhardobservedofcuttjngprocess，low—speedonhogoⅡa1cuttjngexperimentsareadoptedjnthepapeLTheprocessesofchjpfoⅡnationcanbeobseⅣeddearly．T11eeffe

4、ctoft11edi骶rerItcuttingconditionsto舒aphitechjpformation，morpholo西esofgraphitechipsandcuttingforceisstudied．Iqpracticalmachinin舀milleddustconcemrationishi曲，thusdiVersif：iedpreVentionmeasuresarebrou啦tfo州ardinthispaper．ThestIldyresultofmeprocessesofchipf0瑚卸onindica

5、tes：(1)111e名＆ct硝deptllofcuttot11eprocessesofchipformationisdistinct．Undersmalldepthofcutin0加．06mm，thechipshapeisspurious曲bonornoccule；wimmoderatedepthOfcutinO．06～O．12衄，severalsmallcollapsechjpsappear；withla唱edepthofcutin0．12～0．24mm，mechjpsmostlyarebreaI【一up．(2)c

6、uttingspeedinnuentschipdiI工lension．ThechipdimeⅡsionswillincrcase∞rrespondin百ywiIhtheincreaseofcuttmgspeed．(3)Toola11出ewilliIlfluencethechipdetacllmeⅡt-T001wiIhDegatjVe珀ke谢11extrudelbechipsperSistenUya11dsmallcrackchipswiUproduce．Whenthechipuplifcedbypressureisex

7、trudedcontinuously，positiverakeangleis900dfbrchipdetachment．T11estudyresultsofonhogonaltestofcuttingforceindicatethat：(1)Theaveragevalueofcuttingforcechangeslittlewiththeincreaseofd印thofcut，themaxiIIl删nvalueandscoper『AB5J1tAolValueofcuttingforce芦aduauyincrease．(

8、2)Cun白唱speedhasinconspicllousinnuenceoncuttingforce．(3)CuttiIlgforceiⅡcreaseslinearlywitllcuttingwidthincreasing．Cllipappearserosesh印eofpiece，bandinga11dgIobosityiⅡon