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1、上海大學(xué)博士學(xué)位論文磨料漿體射流技術(shù)及其機理研究姓名：劉小健申請學(xué)位級別：博士專業(yè)：機械制造及其自動化指導(dǎo)教師：俞濤20060301上海大學(xué)博士學(xué)位論文用紙后者300GJ／m3以上，而切割能力稍弱于后者。另外，基于對試驗進行理論預(yù)測和質(zhì)量監(jiān)控的需要，還對磨料漿體射流進行了切割深度建模研究。關(guān)鍵詞：磨料漿體，流變特性，本構(gòu)方程，交錯網(wǎng)格，流場特性，數(shù)值模擬切割性能，切割深度模型上海大學(xué)博士學(xué)位論文用紙AbstractWiththerapiddevelopmentofindustcialprocess，moreandmorehighpe
2、rformancemeterialsaredeveloped，andmanyofthemhavespecialstructures．Iftheyarecutviasomeconventionalmethods，it’sdifficulttogethighquality．Ⅶmenthemeterialsarecutwithsketchshapedspecially,it’sverydifficulttoobtainthedesignrequirement．Sincetheabrasivejetcuttinghasthefeatures
3、ofcoldconditions，point-cut，commonality,high-quatilyandpollution—free，itoccupiesmoreandmoreimportantpositioninthecuttingfield．Buttherearesomeshortagesintheexistingabrasivejettechnologyortherearesomeimperfectinfluencingthewideusingofitinourcountry．Suchashigh—pressure(>20
4、0Mpa)isusedinabrasivejetcuttingsytemandthismakeaapplicationbottleneckinourcountrybecauseofthenozzleabradabilityorthehermeticproblemwithhigh—pressurewhichinfluencethestabilityandthereliabilityofthesystem．Sincethenozzlesizeisbiggerinthedia—injectedabrasivewaterjetcutting
5、system，thecuttingwidthisbigger,thecuttingfaceisrougher,theabrasivegrainiseasyertodepositorpluginthepipe，andthecontinousfeederprocesscan’tberealized．11lispaperispresentedandstudiedwithabovetechnologybackground．theresearchmainlyreducesthesystempressureintheprocesstechnol
6、ogy，realizestherecycleduseoftheabrasivesuspensionandthehigh—pressuretransfermediumseparately,newprocessandmethodarepresentedwhichimprovetheprocesstructure，reducethemachiningcost．Therheologicalcharacters，theflowfieldcharactersareexploredandgrasped．thenumericalsimulation
7、oftheflowfieldinnozzleismade，theabrasivesuspensionjetcuttingperformanceisstudied．Inthispaper,thestructureofthehigh—pressuretankwhichisthekeydeviceofthesystemisdesigned，inwhichtheabrasivesuspensionandthehigh—pressuretransfermediumiscompleteisolated．Thetransfermechanismo
8、fthehigh—pressuretankoverseaischanged．Basedonthisfoundationalstudy,thetotalstructureandtheprocessflowaredesigned，ther
