7075 txhuas yog ib qho siab - lub zog alloy dav siv hauv aerospace, tiv thaiv, thiab siab - kev lag luam tsheb vim nws lub zog zoo heev - rau - qhov hnyav piv, piv rau ntau cov hlau. CNC milling yog thawj txheej txheem tsim khoom tsim kom yooj yim, meej cov khoom siv los ntawm cov khoom siv no. Cov lus qhia no muab cov lus qhia dav dav ntawm cov txheej txheem txheej txheem, tsis muaj, thiab kev txiav txim siab rau kev ua tiav machining 7075 txhuas, ua kom muaj qhov zoo, qhov tseeb, thiab cov txheej txheem ua haujlwm rau cov kws tshaj lij engineers thiab cov kws tshaj lij kev muag khoom.
Cov yam ntxwv ntawm cov khoom siv thiab kev npaj ua haujlwm
7075 txhuas (feem ntau ua raws li cov qauv zoo li ASTM B209 / AMS 4117) yog zinc-raws li alloy hauv 7xxx series. Nws yog feem ntau muab rau hauv T6 temper (kev daws teeb meem kub- kho thiab muaj hnub nyoog artificially) kom ua tiav nws lub siab tshaj plaws. Cov khoom tseem ceeb muaj xws li lub zog tensile siab (txog 570 MPa lossis 83 ksi) thiab kev qaug zog zoo. Txawm li cas los xij, nws muaj kev tiv thaiv corrosion qis dua piv rau lwm cov alloys xws li 6061, uas tej zaum yuav xav tau tom qab anodizing lossis lwm yam kev kho saum npoo.
Ua ntej machining, kev npaj ua haujlwm kom zoo yog qhov tseem ceeb. Cov khoom siv raw yuav tsum ruaj khov kho kom txo qis kev vibrations, uas tuaj yeem ua rau muaj kev sib tham thiab qhov tsis raug. Rau cov geometry nyuaj, kev cai jigs lossis vises raug pom zoo. Tsim kom muaj kev txhim khu kev qha datum (reference point) ntawm lub workpiece yog qhov tseem ceeb rau CNC kev pab cuam kom raug txheeb xyuas qhov system.
Cov cuab yeej xaiv thiab Geometry
Kev xaiv cov cuab yeej txiav yog qhov tseem ceeb rau kev ua haujlwm zoo.
- Khoom siv:Khoom carbide kawg mills yog cov qauv xaiv. Lawv muab superior hardness, rigidity, thiab kub tsis kam piv rau high-ceev steel (HSS). Rau kev siv lub neej ntev thiab kev tsim khoom ntau dua, cov cuab yeej nrog pob zeb diamond-coated carbide lossis polycrystalline pob zeb diamond (PCD) cov lus qhia tau ua haujlwm siab - ntim ntau lawm.
- Tool Geometry:Lub kaum sab xis zoo yog feem ntau nyiam vim nws txo qhov txiav quab yuam thiab tsim cov chips thinner, ua rau lub ntsej muag smoother. Lub kaum sab xis siab (nyob ib ncig ntawm 38℃-45 degree) pab txhawb kev khiav tawm ntawm nti. Peb-flute kawg mills feem ntau muab qhov zoo sib npaug ntawm nti tshem tawm thiab lub zog rau kev ua tiav ib nrab thiab ua tiav cov haujlwm hauv txhuas.
- Txheej:Tsis yog- cov txheej nplaum xws li Titanium Aluminium Nitride (AlTiN) lossis cov khoom sib xws tuaj yeem pab tiv thaiv kev ua haujlwm ntawm txhuas rau cov npoo txiav, txo qis ua -nce ntug (BUE) thiab txhim kho lub neej ntawm cov cuab yeej.
Machining Parameters thiab cov tswv yim
Optimizing txiav tsis yog qhov tseem ceeb rau kev ua tiav qhov xav tau sib npaug ntawm cov hlau tshem tawm tus nqi, cuab yeej lub neej, thiab qhov chaw tiav.
- Txiav ceev (Vc):7075 txhuas tuaj yeem ua haujlwm ntawm qhov nrawm nrawm. Rau carbide kawg mills, ceev feem ntau yog li ntawm 200 mus rau 400 meters ib feeb (m / min) los yog 650 mus rau 1300 nto ko taw ib feeb (SFM) rau roughing, thiab yuav ua tau kom tiav rau tiav.
- Feed Rate (fz):Kev pub rau tus hniav yog qhov tseem ceeb rau kev tsim cov chips. Ib qho khoom noj tsawg dhau tuaj yeem ua rau rub thiab ua haujlwm tawv, thaum lub siab pub ntau dhau ua rau lub cuab yeej siab. Qhov ntau ntawm 0.05 mus rau 0.15 mm rau ib tus hniav yog ntau. Lub nti tuab yuav tsum tau tswj xyuas kom ntseeg tau tias cov cua sov tshem tawm nrog cov nti.
- Qhov tob ntawm Txiav (Ap) thiab Dav ntawm Txiav (Ae):Rau roughing, siab axial qhov tob ntawm kev txiav (txog li 1x lub cuab tam txoj kab uas hla) nrog ib tug nruab nrab radial stepover (30-50% ntawm cov cuab yeej txoj kab uas hla) yog zoo. Rau kev ua tiav, lub teeb axial qhov tob ntawm kev txiav (0.1-0.5 hli) thiab radial stepover ntawm 5-10% ntawm cov cuab yeej txoj kab uas hla yog siv los ua kom tiav qhov chaw zoo.
- Coolant thiab Chip Evacuation:High - siab dej nyab lub qhov txias yog pom zoo. Nws ua haujlwm peb lub luag haujlwm tseem ceeb: dissipating tshav kub, lubricating qhov txiav, thiab, qhov tseem ceeb tshaj plaws, tshem tawm cov chips los ntawm cheeb tsam txiav. Kev tshem tawm cov nti ua tau zoo yog qhov tseem ceeb los tiv thaiv re- txiav cov chips, uas tuaj yeem ua rau lub ntsej muag ua haujlwm puas tsuaj thiab ua rau cov cuab yeej ua tsis tiav ntxov.
Kev ua haujlwm tshwj xeeb Milling
- Roughing:Lub hom phiaj yog qhov siab tshaj plaws tshem tawm cov khoom. Siv cov cuab yeej muaj zog nrog lub hauv paus muaj zog thiab siv trochoidal lossis hloov kho cov tswv yim tshem tawm hauv CAM software. Cov tswv yim no tswj cov cuab yeej ua haujlwm tas li thiab kev koom tes, txo kev poob siab thiab kev tsim hluav taws xob.
- Ua tiav:Lub hom phiaj yog qhov tseeb qhov tseeb thiab zoo tshaj qhov chaw tiav. Siv cov ntse ntse, ua tiav qhov kawg mills. Nce milling (down{2}}milling) yuav tsum tau siv nyob qhov twg los tau raws li nws muab ib tug huv si txiav, zoo dua nto tiav, thiab ntev lub cuab tam lub neej piv rau cov pa milling.
Quality Assurance and Post-Kev ua tiav
Tom qab{0}} kev tshuaj xyuas tshuab yog qhov yuav tsum tau ua. Qhov ntev tseem ceeb yuav tsum raug txheeb xyuas siv cov cuab yeej ntsuas ntsuas xws li Coordinate Measuring Machines (CMM), optical comparators, los yog precision calipers thiab micrometers. Nto roughness yuav tsum tau ntsuas nrog ib tug profileometer los xyuas kom meej tias nws ua tau raws li qhov yuav tsum tau (piv txwv li, Ra <1.6 µm). Rau ntau daim ntawv thov, koom tes nrog kev paub dhau losaluminium milling kev pabcuamUa kom nkag tau mus rau cov cuab yeej CNC siab heev, cov tswv yim ua haujlwm ua pov thawj, thiab cov txheej txheem tswj xyuas kom zoo, lav tias qhov kawg ua tau raws li txhua qhov kev qhia tshwj xeeb. Thaum kawg, deburring thiab tu yog qhov tseem ceeb tshaj tawm - cov kauj ruam ua kom tshem tawm cov npoo ntse thiab cov khoom seem ua ntej cov khoom raug tso tawm rau kev siv lossis kev kho deg ntxiv.
Kev vam meej CNC milling ntawm 7075 txhuas yuav tsum muaj txoj hauv kev uas suav nrog kev xaiv cov cuab yeej raug, kev ua kom zoo dua qub, ua kom txias txias, thiab kev tswj xyuas nruj. Kev ua raws li cov kev coj ua hauv kev lag luam no ua kom muaj kev ua haujlwm siab - cov khoom muaj kev ncaj ncees uas ua kom muaj peev xwm ua tau zoo ntawm qhov siab no - alloy kev ua tau zoo, ua rau nws muaj kev ntseeg siab rau kev thov kev siv engineering.