Kev xaiv graphite yog tus yuam sij kom ua tiav qhov kev ua tau zoo ntawm koj lub qhov dej tuag
Graphite yog cov khoom xaiv rau feem ntau ntawm EDM electrodes uas tsim hnub no nyob rau hauv Western ntiaj teb no. Xaiv cov qib zoo tshaj plaws ntawm graphite rau ib daim ntawv thov yuav nyuaj yog tias qhov sib txawv ntawm qib graphite tsis to taub. Nyob ntawm qib graphite xaiv thiab daim ntawv thov, graphite tuaj yeem yog qhov txwv lossis qhov tseem ceeb hauv kev ua tiav cov txiaj ntsig xav tau los ntawm cov khoom siv.
Muaj ntau yam ntawm cov qib los ntawm ib tug xov tooj ntawm manufacturers xaiv los ntawm. Txhua lub chaw tsim khoom siv cov txheej txheem sib txawv, cov khoom siv thiab cov txheej txheem tswj, uas txhais tau tias cov khoom kawg, yuav txawv heev. Txhua qhov chaw tsim khoom qib yog tsim los rau kev ua tau zoo tshaj plaws rau qee hom kev siv. Txhawm rau pab rau kev xaiv cov khoom siv, txhua lub chaw tsim khoom luam tawm cov kev qhia tshwj xeeb ntawm lawv cov khoom, tab sis tsis muaj cov qauv kev xeem.
Txij li txhua qib ntawm graphite zoo ib yam li lwm qib, qhov tsos tsis yog ib feem ntawm cov txheej txheem xaiv. Txhua qib yuav tsum raug xaiv los ntawm nws cov yam ntxwv ntawm lub cev thiab cov khoom. Txhawm rau ua kom cov txheej txheem no yooj yim dua, ntau qib ntawm graphite tau muab faib ua rau rau qhov kev faib tawm uas tau muab cais los ntawm qhov loj me me. Tsuas yog plaub ntawm rau qhov kev faib tawm yog tsim rau siv raws li EDM electrodes. Cov qib sib txawv li cas hauv cov kev faib tawm yog qhov qhia txog lawv qhov peev xwm ua tau zoo.
Ua ntej hauv Graphite
Kev lag luam graphite tseem niaj hnub siv zog los tsim cov qib siab dua. Cov ntaub ntawv Graphite tau txuas ntxiv mus txuas ntxiv nrog rau lwm yam ntawm EDM kev lag luam, tab sis ntawm qhov tsis tshua muaj siab. Kev nce qib tau ua nyob rau hauv microstructure ntawm cov khoom siv graphite, vim qhov no yog tus yuam sij rau kev ua haujlwm.
Coarse graphites nrog qhov loj me dua 100 microns yeej tsis tau tsim los ua cov khoom siv electrode. Nyob rau xyoo kaum xyoo dhau los, cov qib nruab nrab nrog qhov me me ntawm 21-100 microns muaj tag nrho tab sis ploj ntawm kev ua lag luam raws li cov khoom siv EDM. Hauv ob peb xyoos dhau los no ntau ntawm cov qib qis kawg hauv cov kev faib zoo (11-20 micron particle loj cov ntaub ntawv) kuj tau ploj mus. Cov kev faib tawm superfine (6-10 particle size) cov ntaub ntawv tau nyob ruaj khov. Qee tus neeg tsim khoom ntawm cov ntaub ntawv no tso cai rau lawv cov qib graphite muag raws li lub tsev hom, uas tuaj yeem ua rau cov neeg siv khoom tsis meej pem. Tsis meej pem tshwm sim thaum cov neeg siv khoom siv hloov pauv cov npe ntawm lawv lub tsev hom, tab sis tseem siv cov khoom qub lossis hloov cov khoom siv, tab sis khaws tib lub npe rau lub tsev hom. Tib qib yuav muaj nyob rau hauv ntau lub tsev hom npe.
Qhov kev faib tawm ultrafine (1-5 micron particle loj) yog qhov uas feem ntau ntawm kev txhim kho tiag tiag yog tsom. Ntau yam ntawm cov khoom siv yas xav tau pwm nrog cov ntsiab lus zoo thiab ua tiav uas tuaj yeem ua tiav nrog cov ntaub ntawv ultrafine. Cov ntaub ntawv hauv kev faib tawm no nyuaj heev thiab kim heev los ua thiab nws tseem nyuaj dua los tsim cov khoom sib xws tom qab batch thiab xyoo dhau los.
Muaj cov qib tsawg heev hauv kev faib tawm angstrofine (< 1 micron particle size). The grades are available in small blocks to control the uniformity of the graphite. These grades are the most expensive to produce and have limited use. Generally, they are used for fine detailed engraving electrodes and small featured electrodes that produce very high surface finishes without the use of powder additives when polishing of cavities is not possible.
Cov qib qis kawg graphite tau maj mam ploj mus los ntawm kev ua lag luam raws li EDM daim ntawv thov hloov. Cov kab noj hniav loj loj ua haujlwm yam tsis muaj kev nthuav dav zoo thiab forging tuag tau yooj yim ua tau los ntawm kev kub ceev milling yog li txo qhov xav tau ntawm cov qhab nia hauv kev faib zoo. Nyob rau tib lub sij hawm intricate ncauj lus kom ntxaws kab noj hniav ua hauj lwm yuav tsum tau graphite nrog me me particle loj, uniform microstructure thiab siab zog los tsim complex, me-featured kab noj hniav.
Qib hauv Classifications
Lub cev muaj zog ntawm txhua qib ntawm graphite txiav txim siab nyob rau hauv kev faib tawm. Cov khoom uas cuam tshuam kev ua tau zoo yog particle loj, flexural zog thiab ntug hardness. Cov khoom no nrog rau photomicrograph ntawm microstructure yog cov cuab yeej zoo tshaj plaws rau kev twv ua haujlwm graphite.
Qhov zoo tshaj plaws graphite hauv txhua qhov kev faib tawm tau ntim cov khoom nruj me ntsis nrog qhov sib txawv me me. Cov khoom zoo li no tiv taus hnav los ntawm thermal xwm ntawm EDM txheej txheem. Particle loj yog feem ntau teev raws li qhov nruab nrab loj. Thaum particle loj spans ib tug me me, lub microstructure ntawm cov khoom ua ntau yam nrog txo porosity. Lub porosity hauv graphite yog ciam teb ntawm cov khoom. Cov khoom sib txuas ua ke los ntawm kev siv tshuaj lom neeg lossis kev siv tshuab thiab qhov tsis ua haujlwm ntawm qhov system no yog dab tsi tso cov khoom mus rau hauv qhov sib txawv thaum EDMing. Yog tias cov khoom siv me me, tsis sib xws hauv qhov loj thiab ntim nruj, kev yaig ntawm cov electrode yog tsawg. Particle loj muaj ib tug bearing ntawm qhov tsawg kawg nkaus nto tiav uas cov khoom yuav tsim. Txij li cov electrode reproduces nws cov qauv nyob rau hauv cov kab noj hniav, zoo nto finishes tsis tau nrog graphite qib uas muaj loj particle thiab non-uniform microstructure.
Lub microstructure ntawm qib graphite feem ntau yog qhov txwv tsis pub txiav txim siab EDM kev ua tau zoo. Cov qauv tsis sib xws nrog ntau qhov sib txawv thiab qhov pore loj tuaj yeem muaj cov pob muag muag uas yog qhov loj ntawm cov porosity thiab / lossis cov pob tawv tawv uas yog cov conglomerates tshwm sim los ntawm kev sib xyaw ua ke. Cov pob tawv tawv kuj tuaj yeem tshwm sim los ntawm impregnating qhov qhib porosity ntawm cov khoom siv nrog suab thiab tom qab ntawd rov ua dua cov khoom muab cov khoom thiab pitch impregnated thaj chaw sib txawv hardness qhov tseem ceeb. Txij li thaum lub qhov muag tsis pom kev tsis tuaj yeem pom lub microstructure, tsis muaj txoj hauv kev los txheeb xyuas cov teeb meem no ua ntej cov txheej txheem machining. Kev txheeb xyuas qhov ua rau ntawm cov teeb meem machining suav nrog kev kuaj kev puas tsuaj thiab kev tshuaj xyuas ntawm photomicrographs.
