Vim li cas Graphite Dominates EDM Electrode Practice
Graphite thiab tooj liab yog ob qho khoom siv hluav taws xob tsim hluav taws xob rau kev siv hluav taws xob, thiab graphite tam sim no tso nyiaj rau feem ntau ntawm EDM electrodes nyob rau hauv European pwm khw, nrog rau feem ntau hais txog cov nuj nqis saum toj no 90 feem pua. Yog vim li cas tsis yog ib qho cuab yeej tab sis kev sib xyaw ua ke: cov tshuab graphite ob peb zaug sai dua, tuav nws cov duab ntawm qhov kub thiab txias qhov twg tooj liab deforms, hnyav ib feem ntawm tooj liab, thiab cuam tshuam nrog cov roj hydrocarbon dielectric thaum tawm hauv ib txoj kev uas ib nrab offsets hnav.
Machining Ceev thiab Electrode Lead Time
Graphite feem ntau yog ob mus rau tsib zaug sai dua rau tshuab dua tooj liab, thiab ob mus rau peb zaug sai dua hauv EDM kev ua haujlwm nws tus kheej, nyob ntawm qib thiab geometry. The gain comes from the material's low density and its behaviour under the cutter: it forms a clean chip, needs no heavy clamping and can be machined at high spindle speeds with standard carbide tooling.
Rau cov pwm nrog ntau cov tav thiab qhov sib sib zog nqus qhov cuam tshuam rau lub sijhawm txhuas yog qhov tseem ceeb, vim tias cov khoom siv hluav taws xob ntau dua li lub voj voog hluav taws xob feem ntau teeb tsa lub sijhawm. Faster machining kuj txo tus nqi ntawm txhua electrode, uas ua rau nws economic los npaj ob peb roughing thiab tiav electrodes los ntawm tib yam dawb paug.
Thermal Stability thiab Dimensional Accuracy
Copper softens ntawm kwv yees li 1000℃thiab yields nyob rau hauv hnyav machining los yog ntev tso tawm, yog li nyias phab ntsa thiab ntse ces kaum yuav rub tawm ntawm kam rau ua. Graphite sublimes nyob ib ncig ntawm 3650 degree, thiab nws coefficient ntawm thermal expansion tsuas yog li 2 txog 5 × 10.-6ib degree, kwv yees li ib lub hlis twg rau ib yim ntawm tooj liab tus nqi ntawm 17 × 10-6ib degree, nyob ntawm qib.
Cov txiaj ntsig tau zoo yog tias ribbed thiab nyias -cov electrodes nyob hauv phab ntsa tuav lawv qhov ntev los ntawm ob qho tib si machining thiab tawm, thiab cov electrodes loj ntawd khaws lawv cov duab txawm tias tus ntoo khaub lig- ntu me me piv rau qhov ntev.
Qhov hnyav, tuav thiab tshuab Load
| Khoom | Graphite | Tooj |
|---|---|---|
| Qhov ntom | 1.7-2.2 g / cm³ | 8.9 g / cm³ |
| Cwj pwm ntawm qhov kub thiab txias | sublimes ntawm txog 3650 degree | softens ntawm txog 1000 degree |
| Coefficient ntawm thermal expansion | 2 rau 5 × 10-6rau degree | 17 × 10-6rau degree |
| txheeb ze machining ceev | 2 mus rau 5 npaug sai dua | siv |
| txheeb ze EDM ceev | 2 mus rau 3 zaug sai dua | siv |
Vim tias graphite yog kwv yees li ib feem tsib ntawm qhov ntom ntom li tooj liab, ib qho hluav taws xob loj uas yuav nyuaj rau nqa hauv tooj liab tuaj yeem tuav tes lossis nrog lub teeb pom kev hauv graphite. Qhov qis qis kuj tseem txo cov load ntawm lub tshuab taub hau thiab ntawm qhov chaw axes, uas yuav pab tswj tau qhov tseeb thaum siv cov electrodes hnyav.
Tshem tawm tus cwj pwm, hnav thiab kev txwv
Thaum tso tawm cov roj hydrocarbon hauv lub tank decomposes ntawm qhov kub thiab txias thiab tso cov pa roj carbon txheej ntawm lub ntsej muag electrode. Cov txheej ntawd ib nrab them nyiaj rau electrode poob, yog li hnav hauv graphite feem ntau qis dua qhov kev sib piv cov cuab yeej yooj yim yuav kwv yees. Cov nyhuv yog nyob ntawm cov txheej txheem tsis, cov roj chemistry thiab qib ntawm graphite, yog li nws yog qhov zoo tshaj plaws kho raws li kev nyiam nyiam es tsis yog kev lees paub.
Graphite muaj kev txwv. Nws yog nkig ntau dua tooj liab, yog li cov npoo tuaj yeem nti thaum tuav thiab ua haujlwm, thiab cov plua plav uas nws tsim tawm yog cov khoom siv hluav taws xob, uas txhais tau tias cov chaw ua haujlwm xav tau cov plua plav tshem tawm thiab qhov cua. Tooj liab ua kom muaj txiaj ntsig zoo rau cov electrodes me me thiab ua kom zoo - ua tiav kev ua haujlwm hauv lub teeb tawm hluav taws xob, qhov twg nws cov ductility thiab qis qis hnav tseem ceeb tshaj qhov nrawm. Cov khoom xaiv yuav tsum ua raws li cov electrode geometry, txoj kev machining muaj thiab qhov yuav tsum tau ua tiav ntawm cov kab noj hniav.
Cov lus nug nquag
Q: Ntau npaum li cas yog graphite sai dua tooj liab hauv EDM?
Feem ntau ob mus rau peb zaug sai dua hauv kev ua haujlwm tawm thiab ob mus rau tsib zaug nrawm dua hauv machining, nrog qhov sib piv pes tsawg nyob ntawm qib, geometry thiab cov txheej txheem tsis.
Q: Vim li cas graphite tiv thaiv thermal deformation?
Nws sublimes ntawm li 3650 degree, deb tshaj li ntawm 1000℃softening point ntawm tooj liab, thiab nws coefficient ntawm thermal expansion yog hais txog ib lub quarter rau ib yim ntawm tooj liab.
Q: Puas yog graphite ib txwm yog cov khoom siv electrode zoo dua?
Tsis yog. Copper tseem tsim nyog rau cov electrodes me me thiab ua kom zoo - ua tiav kev ua haujlwm hauv lub teeb, thaum graphite dominates qhov ceev, loj electrode loj thiab thermal stability txiav txim qhov tshwm sim.
Q: Puas yog graphite plua plav xav tau kev tuav tshwj xeeb?
Yog lawm. Graphite plua plav yog cov khoom siv hluav taws xob, yog li nws yuav tsum tau ntes ntawm lub tshuab nrog cov plua plav tshem tawm thiab qhov chaw ua haujlwm yuav tsum tau ua kom cua zoo.
Q: Puas yog cov roj dielectric cuam tshuam rau graphite electrode hnav?
Nws ua tau. Cov pa roj carbon los ntawm cov roj decomposed tso rau ntawm electrode thiab ib nrab offsets hnav, nrog rau qhov loj ntawm cov nyhuv nyob ntawm seb cov roj hom thiab qhov paug tawm.
Q: Cov qib graphite twg yog siv rau EDM electrodes?
Fine-cov nplej, siab- qib muaj zog nrog cov qauv zoo sib xws thiab cov ntsiab lus tsis zoo yog siv, vim tias lawv tuav cov ntsiab lus zoo thiab ua kom muaj qhov tso tawm ruaj khov.