Kev tswj kev sib tsoo kev ua haujlwm ntawm kev sib tsoo log ntawm kev sib xyaw granularity ntawm abrasives

Sib tsoo yog txheej txheem machining uas lub log sib tsoo abrasive (GS, raws li tau muab rau hauv daim duab 1) yog siv los tshem tawm cov ntaub ntawv ntawm qee qhov kev sib hloov ceev [1]. Kev sib tsoo log yog tsim los ntawm abrasives, binding agent, fillers thiab pores, thiab lwm yam. Nyob rau hauv uas, lub abrasive plays lub luag hauj lwm ntawm kev txiav ntug thaum lub sij hawm sib tsoo txheej txheem. Lub toughness, lub zog, fractural cwj pwm, geometry ntawm abrasive muaj ib qho tseem ceeb ntawm kev sib tsoo kev ua tau zoo (sib tsoo muaj peev xwm, deg kev ncaj ncees ntawm machined workpiece, thiab lwm yam) ntawm sib tsoo log [2, 3].

Fig. 1.Cov sib tsoo cov log sib xyaw nrog cov granularity ntawm abrasives.

Lub zog ntawm zirconia alumina (ZA) nrog cov granularity ntawm F14 ~ F30 tau sim. Cov ntsiab lus abrasive ntawm F16 lossis F30 hauv GS npaj tau muab faib ua tsib qib ntawm siab mus rau qis: ultrahigh (UH), siab (H), nruab nrab (M), qis (L), thiab tsis tshua muaj siab (EL). Nws tau pom tias Weibull crushing lub zog ntawm F14, F16 thiab F30 ntawm ZA yog 198.5 MPa, 308.0 MPa thiab 410.6 MPa, raws li qhia tau hais tias lub zog ntawm ZA loj hlob nrog qhov txo qis ntawm abrasive grit loj. Qhov loj dua Weibull modulusmqhia qhov sib txawv tsawg dua ntawm cov khoom kuaj [4-6]. CovmTus nqi txo nrog qhov txo qis ntawm abrasives grit loj, qhia tias qhov sib txawv ntawm cov kev sim abrasives tau loj dua nrog qhov txo qis ntawm abrasive grit [7, 8]. Txij li qhov tsis xws luag ntawm abrasive yog qhov tsis tu ncua, cov abrasives me me muaj qhov qis dua ntawm qhov tsis xws luag thiab muaj zog ntau dua, yog li ua kom cov abrasives zoo dua ua rau tawg.

Fig.2. Weibull tus yam ntxwv kev ntxhov siabs₀thiab Weibull modulusmrau txawv granularities ntawm ZA.

Abrasive comprehensive hnav qauv ntawm cov txheej txheem kev pabcuam zoo tshaj plaws tau tsim [9], raws li tau piav qhia hauv daim duab 3. Nyob rau hauv cov xwm txheej zoo tagnrho, cov abrasive muaj kev siv siab thiab GS nthuav tawm kev sib tsoo zoo [3]. Nyob rau hauv qhov muab kev sib tsoo load thiab khi tus neeg sawv cev lub zog, lub ntsiab hnav mechanisms tau hloov los ntawm attrition hnav thiab micro-facture rau F16 mus rau attrition hnav thiab rub-tawm rau F30 muaj rau qhov sib txawv ntawm abrasive crushing zog [10,11]. Lub attrition hnav induced GS degradation thiab tus kheej-sharpening los ntawm abrasive rub-tawm yuav ua tau ib tug equilibrium xeev, yog li txhawb kev sib tsoo muaj peev xwm ho [9]. Rau kev txhim kho ntxiv ntawm GS, lub zog abrasive crushing, khi tus neeg sawv cev lub zog thiab kev sib tsoo load, nrog rau kev hnav cov txheej txheem hloov pauv ntawm cov abrasives, yuav tsum tau kho thiab tswj los txhawb kev siv abrasives.

Fig.3.Cov txheej txheem kev pabcuam zoo tshaj plaws ntawm abrasive

Txawm hais tias kev sib tsoo kev ua tau zoo ntawm GS cuam tshuam los ntawm ntau yam, xws li abrasive crushing zog, khi tus neeg sawv cev lub zog, sib tsoo load, abrasive txiav cwj pwm, sib tsoo tej yam kev mob, thiab lwm yam., kev soj ntsuam ntawm kev tswj mechanisms ntawm sib tov granularities ntawm abrasives yuav muab zoo siv nyob rau hauv tsim thiab tsim ntawm GS.

Cov ntaub ntawv 

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