CNC Machining Milling: Toolpath Strategy, Khoom Parameters, thiab Fixturing Kev Txiav Txim Uas Txiav Txim Siab Seb Koj Qhov Nkoj ntawm Spec
Koj lub hnab ntim qhov tob yog 18mm. Dav yog 4mm. Phab ntsa ntawm sab ntev yog 1.1 hli. Khoom siv yog 7075-T651. Koj qhov kev tshuaj xyuas DFM rov qab los nrog ib tus chij: "qhov kev faib ua feem yuav tsum tau txo qis thiab nce kev hla - pom zoo tshuaj xyuas yog tias phab ntsa geometry raug txwv tsis pub ua haujlwm."
Tus chij ntawd tsim nyog nkag siab ua ntej koj thawb rov qab rau nws. Qhov dav 4 hli yuam qhov siab kawg zeb txoj kab uas hla ntawm 3.2mm los tswj lub kaum sab xis uas koj tau hu tawm. A 3.2mm kawg zeb ntawm 18mm qhov tob yog khiav ntawm qhov ntev - mus rau - txoj kab uas hla ntawm 5.6: 1. Ntawm qhov piv txwv ntawd, lub cuab yeej deflects hauv qab -load, thiab lub deflection tsis zoo li - nws yog ntau dua nyob rau hauv qab ntawm lub hnab tshos tshaj nyob rau sab saum toj, uas ua rau ib tug tapered phab ntsa. Lub taper tej zaum yuav nyob rau hauv koj parallelism kam rau ua; nws yuav tsis. Txawm li cas los xij, lub voj voog lub sij hawm ua ob npaug vim tias tus nqi pub yuav tsum poob los tswj kev deflection.
Qhov no yog geometry - txheej txheem kev sib raug zoo uasCNC machining qhov chawkev txiav txim siab tig rau. Tsis yog tias lub tshuab tuaj yeem ncav cuag cov yam ntxwv - nws tuaj yeem - tab sis seb lub tswv yim zoo li cas, kev xaiv cov cuab yeej, thiab kev kho kom haum tuaj yeem tuav koj cov lus nug ntawm tus nqi uas ua rau cov khoom tsim tau.
Toolpath Strategy: Thaum Trochoidal Milling Outperforms Pas Slotting
CNC milling trochoidal vs pa toolpathtsis yog ib lo lus nug optimization abstract. Nws muaj cov lus teb tshwj xeeb raws li qhov tshwj xeeb geometry thiab cov khoom siv.
Cov pa slotting - plunging ib tug tag nrho - dav kawg zeb rau hauv ib lub hnab tshos thiab traversing - ua rau lub cuab tam nyob rau hauv tas li kev sib cuag nrog lub workpiece. Ntawm aluminium ntawm qhov tob tob, qhov no ua haujlwm. Qhov teeb meem pib thaum lub qhov nqaim dua li 1.5 × lub cutter txoj kab uas hla, los yog thaum qhov tob - rau - dav piv tshaj 3: 1. Thaum lub sij hawm ntawd, nti khiav tawm degrades, txiav cov cua kub hauv qab ntawm qhov, thiab lub cuab yeej deflects vim hais tias cov radial kev koom tes yog siab dhau rau lub cuab yeej rigidity ntawm lub overhang ntev.
Trochoidal milling - ncig arc toolpaths uas txwv radial kev koom tes rau 10-20% ntawm cutter txoj kab uas hla tsis hais qhov dav dav - daws tag nrho peb cov teeb meem ib txhij. Lub nti load rau ib tug hniav nyob twj ywm vim hais tias cov kev sib koom arc nyob twj ywm. Thaum tshav kub kub khiav tawm vim tias lub cuab yeej tawm ntawm qhov txiav ntawm txhua qhov arc. Deflection poob vim hais tias lub radial quab yuam yog ib feem ntawm cov pa slotting rooj. Kev lag luam tawm -tawm yog qhov ntev ntawm lub cuab yeej: qhov kev pab cuam trochoidal mus deb dua kom tshem tawm tib lub ntim. Tab sis ntawm 7075-T651, trochoidal tso cai rau tag nrho qhov tob dhau ntawm lub qhov tob tag nrho hauv ib qho kev ua haujlwm, qhov twg cov pa slotting xav tau ntau qhov tob ntxiv thiab 30-40% qis dua.
Lub tswv yim crossover point: siv trochoidal thaum lub qhov tob - rau - dav piv tshaj 2.5: 1, los yog thaum lub qhov dav ntawm 1.0 × thiab 1.5 × lub cutter txoj kab uas hla. Hauv qab 2.5: 1 qhov tob- rau- dav ntawm qhov qhib hauv aluminium, cov cuab yeej siv tau nrawm dua. Saum toj no, trochoidal txuag lub sij hawm voj voog thiab ua kom zoo dua phab ntsa zoo - uas tseem ceeb yog tias koj muaj qhov sib luag lossis ncaj qha hu rau ntawm cov phab ntsa.
Plunge milling (插铣) yog qhov kev xaiv thib peb, thiab nws muaj cov ntaub ntawv siv tshwj xeeb: loj - ntim roughing ntawm cov kab noj hniav sib sib zog nqus uas qhov kev txwv tseem ceeb yog cov khoom tshem tawm, tsis yog phab ntsa zoo. Plunge milling directs txiav quab yuam axially es tsis yog radially, uas txhais tau hais tias lub cuab tam muaj peev xwm lis ntau dua qhov tob yam tsis muaj deflection. Kev ua tiav saum npoo yog qhov tsis zoo thiab yuav tsum tau ua tiav, tab sis rau 30mm- lub hnab ntim tsev sib sib zog nqus hauv 7075-T651 qhov twg koj tshem tawm 80% ntawm qhov ntim hauv kev ua haujlwm ntxhib, plunge milling txiav lub sijhawm roughing los ntawm 35-50% piv rau trochoidal. Txoj cai txiav txim: yog tias koj xav tau phab ntsa zoo ntawm qhov sib sib zog nqus, trochoidal. Yog tias koj xav tau cov ntaub ntawv tshem tawm ntawm qhov tob tob thiab yuav ua tiav-mills, plunge.
Cov khoom siv -Tshwj xeeb Milling Parameters: Dab tsi ua tau zoo hauv kev tsim khoom
Cov lus hauv qab no qhia txog kev tsim khoom raucnc milling txheej txheem parameters txhuasthiab lwm yam ntaub ntawv uas peb khiav tsis tu ncuaCNC machining qhov chawkev ua haujlwm. Cov no tsis yog catalog qhov tseem ceeb - lawv muaj kev cuam tshuam qhov peb siv ntawm qhov zoo -tso tseg 5-axis thiab 3-axis machining chaw nrog los ntawm-spindle coolant.
| Khoom siv | Txiav ceev (m / min) | Pub rau Hniav (mm) | Radial DOC - Roughing | Radial DOC - Tiav | Coolant Strategy |
|---|---|---|---|---|---|
| 6061-T6 | 400–600 | 0.05–0.12 | 40-60% Dc | 5-10% Dc | Dej nyab los yog huab cua; compressed cua rau cov hnab ris sib sib zog nqus |
| 7075-T651 | 350–500 | 0.05–0.10 | 30-50% Dc | 5-8% Dc | Dej nyab; mist tau txais ntawm qhib nta |
| Ti-6Al-4V | 50–80 | 0.05–0.10 | 10-20% Dc (trochoidal) | 3-5% Dc | Los ntawm - spindle HPC Ntau dua lossis sib npaug rau 70 bar yuav tsum tau ua |
| 303 Stainless hlau | 80–120 | 0.04–0.08 | 20-30% Dc | 5-8% Dc | Dej nyab; zam kev txiav qhuav |
| 316L Stainless hlau | 60–100 | 0.03–0.07 | 15-25% Dc | 3-5% Dc | Siab- dej nyab siab; ua hauj lwm- hardens sai |
| ib 718 | 25–45 | 0.03–0.06 | 5-10% Dc | 2-3% Dc | Los ntawm - spindle HPC; ceramic tooling rau roughing |
| POM (Delrin) | 200–400 | 0.05–0.15 | 30-50% Dc | 10-15% Dc | compressed cua; zam dej nyab lub coolant |
| PEB | 150–300 | 0.04–0.10 | 20-40% Dc | 5-10% Dc | compressed cua; tswj chip khiav ceev kom zoo |
Dc=cutter txoj kab uas hla. Parameters xav tias ntse, uncoated carbide ntawm txhuas thiab yas; TiAlN-coated ntawm hlau thiab titanium; ceramic ntawm Inconel roughing.
Ib qho tsis tshua muaj tshwm sim hauv cov ntaub ntawv catalog tab sis tseem ceeb hauv kev tsim khoom: kev sib raug zoo ntawm spindle ceev thiab ib feem ntawm lub ntuj zaus ntawm nyias- phab ntsa nta. Yog tias koj tab tom milling 0.8mm aluminium phab ntsa ntawm qhov siab ntxaiv ceev thiab phab ntsa yog chipping los yog qhia chatter marks, qhov kho tsis yog ib txwm ua kom qeeb. Qee lub sij hawm qeeb qeeb tso cov ntxaiv ntawm qhov sib haum xeeb ntawm cov phab ntsa txoj kev vibration hom. Hloov spindle ceev los ntawm ± 15% - ob qho kev taw qhia - tuaj yeem tshem tawm kev sib tham sai dua li hloov pauv tus nqi noj. Qhov no tsis yog txoj kev xav; nws yog qhov kev hloov kho peb ua rau nyias- phab ntsa aluminium vaj tse thaum chatter tshwm nyob nruab nrab ntawm - txoj haujlwm.
Fixturing Logic: Qhov Kev Txiav Txim Siab Uas Txiav Txim Siab Thiab Qhov Zoo
CNC machining qhov chawkam rau ua ntawm complex qhov chaw tsis txwv los ntawm lub tshuab qhov chaw qhov tseeb - niaj hnub machining chaw tuav ± 0.003mm positioning repeatability nyob rau hauv kev tswj tej yam kev mob. Dab tsi txwv qhov kev ua tau zoo nyob rau hauv kev tsim khoom yog qhov kev txhim kho: yuav ua li cas rigidly lub feem yog tuav, li cas raws li cov datum nto raug hu, thiab seb lub clamping rog qhia deflection uas yog tso tawm tom qab unclamping.
Rau prismatic qhov chaw nrog machined nta ntawm ntau lub ntsej muag, lub fixturing ib theem tseem ceeb npaum li cas fixturing txoj kev. Thawj qhov kev teeb tsa yuav tsum tshuab lub datum nto - lub ntsej muag uas yuav nrhiav tau ib feem rau txhua qhov haujlwm tom ntej. Yog hais tias lub datum nto tsis tiaj tus thiab sib npaug mus rau ib leeg nyob rau hauv lub siab ntev yuav tsum tau rau downstream nta, txhua qhov kev teeb tsa tom ntej inherits qhov yuam kev.
Qhov tshwj xeeb fixturing tsis ua hauj lwm hom peb pom feem ntau ntawmCNC millingcov hauj lwm ntawm thawj tsab xov xwm: clamp cov cim ntawm datum ntsej muag uas tau machined nyob rau hauv ib qho kev ua hauj lwm ua ntej. Thaum lub clamp dais ncaj qha rau ntawm qhov chaw tiav, qhov kev sib cuag hauv cheeb tsam deforms deforms elastically - ib feem springs rov qab tom qab unclamping, tab sis lub deformation thaum txiav txhais tau hais tias lub feature yog machined nyob rau hauv lub teeb yog positioned tiv thaiv ib tug displaced datum. Qhov tshwm sim yog qhov yuam kev ntawm qhov chaw uas zoo li lub tshuab ua yuam kev tab sis qhov tseeb yog qhov yuam kev kho. The fix is to clamp on stock, raw surfaces, or pre-machined sacrificial pads rather than finished datum faces.
Rau qhov chaw uas txhua lub ntsej muag ua haujlwm tau zoo - tsis muaj lub ntsej muag nyoos muaj rau clamping - cov kev xaiv yog mos lub puab tsaig machined rau ntawm qhov profile, lub tshuab nqus tsev fixturing ntawm thawj datum lub ntsej muag, los yog ib tug sub- phaj nrog threaded inserts machined rau hauv lub cev thiab tom qab ntawd tshem tawm. Txhua txoj hauv kev muaj tus nqi; tsis muaj leej twg pub dawb. Txoj kev xaiv yog nyob ntawm batch loj thiab cov kev cai kam rau ua.
Nto tiav: Yuav ua li cas Qhia Ra yam tsis dhau - kam rau ua
CNC milling nto tiav Ra specificationyog qhov feem ntau tshaj -tightened callout ntawm machined qhov chaw. Ra 0.8µm yog ua tiav nrog kev tswj xyuas tiav milling dhau thiab tsim nyog rau feem ntau mating ntsej muag, sealing grooves, thiab dav engineering nto. Kev qhia txog Ra 0.4µm ntxiv ib qho kev ua tiav tiav ntawm kev txo qis. Kev qhia txog Ra 0.2µm lossis zoo dua yuav tsum tau lapping lossis kev sib tsoo precision nyob rau sab saum toj ntawm milling - cov txheej txheem cais nrog tus nqi sib cais thiab lub sijhawm ua haujlwm.
Tus nqi Ra los ntawm kev ua haujlwm milling yog kev taw qhia: qhov saum npoo yog smoother perpendicular rau cov kev coj noj coj ua tshaj li thaum uas tig mus rau nws, vim hais tias cov khoom noj yog taw qhia raws li kev coj noj coj ua. Yog tias koj qhov chaw muaj lub ntsej muag sealing uas hu rau lub gasket, qhov cuam tshuam Ra yog hla kev coj noj coj ua, tsis nyob ntawm nws. Rau CMM- tau tshaj tawm Ra qhov tseem ceeb kom muaj txiaj ntsig, kev ntsuas kev taw qhia yuav tsum ua kom haum rau kev ua haujlwm kev sib cuag - uas yuav tsum tau teev rau ntawm daim duab lossis lees paub nrog lub khw.
| Rau Target | Kev Ua Tau Zoo | Yam Pub Tus Nqi txo qis vs Ra 3.2µm | Sau ntawv |
|---|---|---|---|
| Ra 3.2 µm | Standard tiav pass | - (lub hauv paus) | General non{0}}mating nto |
| Ra 1.6 µm | Ua tiav dhau, tswj tsis tau | 20-30% txo | Feem ntau engineering mating ntsej muag |
| 0.8 µm | Dedicated tiav pass, ntse tooling | 40-50% txo | Sealing ntsej muag, kho qhov muag mounting, zawv zawg fits |
| Ra 0.4 µm | Slow tiav dhau los yog ya-txiav | 60-70% txo | High -kev sib khi, CMM cov ntaub ntawv |
| Ra 0.2 µm | Yuav tsum tau sib tsoo los yog lapping | Tsis tuaj yeem ua tiav los ntawm milling ib leeg | Daim iav -zoo kho qhov muag los yog sealing nto |
| Ra 0.02 µm | Precision lapping, MID muaj peev xwm qab nthab | Kev ua haujlwm tshwj xeeb ua tiav | Ultra{0}}precision metrology nto |
Ib qho kev nthuav dav uas cuam tshuam rau Ra nyeem ntawm aluminium: lub qhov ntswg vojvoog ntawm lub qhov txiav los yog qhov kawg zeb kawg geometry. Lub kaum sab xis loj dua ntawm cov cuab yeej ua tiav ua rau lub ntsej muag smoother ntawm tib tus nqi noj vim tias qhov siab ntawm scallop - cov peaks sab laug ntawm qhov uas nyob ib sab dhau - qis dua. Rau lub pob- qhov ntswg kawg zeb ua tiav qhov chaw contoured, Ra yog ncaj qha proportional rau lub square ntawm cov kauj ruam- tshaj faib los ntawm lub pob vojvoog. Ib nrab ntawm cov kauj ruam- dhau txo qis qhov siab ntawm scallop los ntawm 4 ×. Qhov no yog vim li cas contoured nto finishing ntawm txhuas vaj tse feem ntau siv sij hawm ntev dua lub ntsej muag tiaj tus tiav ntawm tib Ra specification.
MID's Milling Capability thiab DFM txheej txheem
PebCNC machining qhov chawcov kev pab cuam khiav ntawm 3-axis thiab 5-axis machining centres, nrog toolpath cov tswv yim xaiv ib hom feature - trochoidal rau qhov tob nqaim, plunge roughing rau loj-ntim kab noj hniav, ib txhij 5-axis rau compound contoured nto. Peb tsis siv ib daim qauv toolpath rau txhua txoj haujlwm; lub tswv yim yog sau rau STEP cov ntaub ntawv, ib qho kev ua haujlwm.
RauCNC millingntawm cov ntaub ntawv sab nraud aluminium - titanium, stainless, Inconel, PEEK - cov txheej txheem kev npaj muaj xws li lub sij hawm hloov lub cuab tam, nyob rau hauv - txheej txheem gauging cov ntsiab lus, thiab thermal stabilization yuav tsum ua ua ntej ua tiav. Rauprecision milled qhov chawnrog tolerances nruj dua ± 0.01mm, txoj kev kuaj xyuas yog sau ua ntej thawj daim yog txiav, tsis yog tom qab.
Xa koj cov ntaub ntawv STEP rau peb txheej txheem engineering teamrau sau DFM tshuaj xyuas. Peb chij geometry tsis sib haum xeeb, teeb meem kev siv cuab yeej, thiab kev txaus ntshai ua ntej qhov kev zov me nyuam raug hais tawm - rov qab tsis pub dhau 24 teev, tsis tas yuav muaj kev cog lus. Rau cov khoom uas twb muaj lawm nyob rau hauv lwm qhov chaw uas tsim tsis tau raws li -, peb tuaj yeem tshuaj xyuas cov txheej txheem txheej txheem uas twb muaj lawm thiab txheeb xyuas qhov laj thawj. Pib ntawm bishenprecision.com.
FAQ
Lub kaum sab xis dab tsi kuv yuav tsum qhia rau ntawm lub hnab ntim sib sib zog nqus kom tsis txhob me me - cov cuab yeej ua haujlwm thiab lub sijhawm txuas ntxiv?
Rau lub hnab tshos qhov tob D, qhia qhov tsawg kawg nkaus sab hauv kaum sab xis ntawm D/4 - thiab yog tias tus qauv tso cai, mus rau D/3. Ntawm 15mm- hnab tshos tob, R3.75 yam tsawg kawg nkaus; R5 zoo. Lub kaum lub vojvoog sib npaug sib npaug ntawm lub vojvoog ntawm cov cuab yeej me tshaj plaws uas tuaj yeem tshuab nws. Cov cuab yeej me me khiav qeeb, deflect ntau dua, thiab tawg ntau zaus, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv uas muaj zog txiav loj. Ib lub kaum R2 ntawm 15mm lub hnab tshos quab yuam 4mm kawg zeb ntawm qhov txo qis - ntxiv 25-40% rau lub sijhawm voj voog rau cov ces kaum ib leeg. Yog tias lub kaum sab xis geometry tsis muaj qhov txwv tsis pub ua haujlwm, nce lub vojvoog rau R5 tsis muaj nqi dab tsi ntawm daim duab kos thiab tshem tawm cov teeb meem me me - tag nrho.
Koj puas tuaj yeem tuav ± 0.005mm ntawm 150mm txhuas lub ntsej muag yam tsis muaj kev sib tsoo?
Nyob rau hauv lub flatness callout, yog - nrog ib tug tiav ya- txiav hla thiab thermal stabilization ua ntej ntsuas. Ntawm ib qho kev sib piv ntawm ob lub ntsej muag, yog - yog tias ob lub ntsej muag yog machined nyob rau hauv tib lub teeb los ntawm tib datum, yog li qhov parallelism yog tsim los ntawm lub tshuab axis geometry es tsis yog los ntawm re-fixturing. Ntawm lub thickness callout ntawm ± 0.005mm hla 150mm, cov lus teb nyob ntawm cov khoom lag luam flatness ua ntej machining thiab thermal lub xeev ntawm kev ntsuas. Aluminium expands 23µm ib 100mm ib℃- ib tug 150mm ib feem ntsuas 2℃saum toj no cov ntaub ntawv kub nyeem 0.007mm thicker tshaj nws tiag tiag. Lub machining yog ua tiav; Cov kev ntsuas ntsuas yog qhov twg ± 0.005mm dhau los ua qhov nyuaj rau kev txheeb xyuas tsis tu ncua.
Thaum twg kuv yuav tsum hloov ntawm 3-axis mus rau 5-axis milling ntawm ib qho nyuaj?
Thaum qhov teeb tsa tshwj xeeb xav tau ntau tshaj li ob qhov teeb tsa ntawm 3-axis tshuab, thiab cov kev teeb tsa muaj feem cuam tshuam txog kev rov qab los ntawm ib qho tiav lossis ib nrab- tiav datum nto. Txhua qhov re-fixture qhia txog datum-hloov yuam kev - feem ntau 0.005–0.015mm nyob ntawm qhov kev tsim kho thiab rov ua dua. Ntawm ib feem nrog rau qhov ua siab ntev ntawm ± 0.01mm ntawm cov yam ntxwv ntawm lub ntsej muag sib txawv, peb rov ua dua - cov khoom sib dhos txaus txaus los cuam tshuam cov peev nyiaj kam rau ua ntej spindle pib. Tsib-axis simultaneous machining tshem tawm cov re-fixtures los ntawm kev ncav cuag qhov sib xyaw- lub kaum ntse ntse hauv ib qho kev teeb tsa. Tus nqi them nqi rau 5-axis - feem ntau yog 25-40% ib teev ntau dua li 3-axis - feem ntau rov qab los ntawm lub sijhawm teeb tsa thiab txo cov seem ntawm qhov chaw uas cov duab kos yuav txwv tsis pub plaub lossis ntau dua 3-axis teeb tsa.
Yuav ua li cas yog txoj hauv kev yog thaum lub milled nto qhia chatter cim ntawm ib tug nyias - phab ntsa aluminium?
Ua ntej, txiav txim tawm fixturing: xyuas seb lub chatter tshwm tsuas yog ntawm cov yam ntxwv nyob ib sab ntawm qhov chaw clamp, uas qhia tias lub clamp yog qhov zoo siab rau qhov kev cuam tshuam ntau dua li cov cuab yeej. Yog hais tias lub chatter yog sib xws nyob rau saum npoo, qhov teeb meem yog cuab yeej -workpiece dynamics. Sim hloov spindle ceev los ntawm ± 10–15% ua ntej hloov tus nqi pub - muab cov ntxaiv ntawm qhov ceev uas tsis txhob muaj qhov zaus ntawm phab ntsa feem ntau nrawm dua li txo cov khoom noj. Yog hais tias tseem muaj kev sib tham, nce tus naj npawb ntawm flutes ntawm cov cuab yeej tiav (4-flute es tsis txhob 2-flute ntawm txhuas rau daim ntawv thov no) kom damping ntawm cheeb tsam txiav. Yog tias tsis muaj ib qho ntawm cov haujlwm no, phab ntsa xav tau kev txhawb nqa ntxiv - txawm tias lub nraub qaum rov qab los yog cov kab noj hniav uas muaj cov kab noj hniav uas lub hnab ntim tau ntim nrog cov quav ciab ua ntej nyias-phab ntsa tiav.
