Cov ntsiab lus tseem ceeb uas cuam tshuam Nto Roughness hauv CNC Precision Part Machining
Txiav tsis
• Pub tus nqi – ntau dua pub nplooj thicker "cusp" ncov; pub ob npaug tuaj yeem nce Ra ntawm 0.8 µm → 1.6 µm.
• Txiav ceev – tsawg dhau ua rau ua - nce ntug (BUE) thiab tearing; siab heev accelerates cuab yeej hnav; ob qho tib si nce roughness.
• Qhov tob ntawm kev txiav - cov cim hnyav hnyav yuav tsum raug tshem tawm los ntawm 0.05–0.1 mm tiav dhau los lossis Ra jumps> 50%.
Tool geometry & condition
• Lub qhov ntswg vojvoog – lub vojvoog loj dua kis nti load; Hloov ntawm 0.4 hli mus rau 0.8 hli tuaj yeem txiav Ra los ntawm 30%.
• Rake & nyem cov ces kaum – ntse zoo rake txo qis txiav quab yuam thiab kev co cim.
• Cov cuab yeej hnav – flank hnav VB> 0.05 µm hloov daim iav tiav rau hauv 1.6 µm Ra yuav luag tag hmo.
Ua haujlwm- cov khoom siv
• Hardness & ductility – mos 6061-T6 Al tuaj yeem smear, whereas 316L ua hauj lwm-hardens thiab muab torn peaks; ob qho tib si nce Ra tshwj tsis yog ceev / pub yog sib npaug.
• Micro-structure – fine-grain heat-kho steel machines to 0.4 µm Ra, as-cam coarse grain struggles to reach 1.6 µm.
Coolant / lubrication
• Dej nyab lub coolant ntawm 8 % concentration ua rau tej cheeb tsam hauv qab 200 degree, suppressing BUE thiab chip vuam; qhuav txiav tuaj yeem ntxiv 0.2-0.4 µm rau Ra.
• Siab-siab los ntawm-spindle coolant (70 bar) rhuav tshem cov chips thiab tiv thaiv kev khawb lwm yam.
Tshuab & fixture dynamics
• Spindle khiav -tawm > 2 µm los yog bearing hnav tsim chatter lobes; Ra tuaj yeem nce los ntawm 0.8 µm → 2.0 µm txawm tias muaj cov cuab yeej zoo meej.
• Overhang > 3 × txoj kab uas hla ntawm kawg- zeb ua zoo li ib rab diav rawg; vibration marks pom ntawm 10 × magnification.
Residual cheeb tsam & nti ntws
• Theoretical ncov qhov siab h ≈ f ² / (8 × R) qhov twg f=pub, R=qhov ntswg vojvoog; txo pub los ntawm 0.2 mm / rev rau 0.05 mm / rev drops h los ntawm 16 ×.
• Chip breakers tsis raug cia chips khawb qhov tsuas yog - txiav nto, ntxiv 0.1–0.3 µm Ra.
Txheej txheem ua ntu zus
• Hla ib 0.1 hli ib nrab- tiav dhau ua ntej 0.02 hli tiav hla tawm 0.4 µm Ra es tsis txhob 0.2 µm ntawm 45 steel.
• Kev nce toj kawg nkaus -mill kev taw qhia muab qis dua Ra dua li kev sib tsoo ntawm feem ntau Al alloys.
Txoj cai- ntawm- daim ntawv qhia ntiv tes xoo
Ra 0.4 µm → ntse ntxig, 0.05 mm / rev, 0.2 mm lub qhov ntswg rad, 150 m / min, dej txias txias, < 1 µm khiav- tawm.
Ra 1.6 µm → OK kom so kom txaus pub rau 0.15 mm / rev, qhov ntswg rad 0.4 mm, tsis muaj qhov tshwj xeeb txias txias.
Ra 3.2 µm → roughing tsis; tsis tas yuav tsum tau ua tiav.
Hauv qab kab
"Nto tiav tsis yog kev huam yuaj-nws yog qhov sib npaug ntawm cov khoom noj, lub vojvoog ntawm lub cuab yeej, nrawm, qhov txias thiab qhov tawv nqaij; tswj lawv thiab koj tswj Ra."
