Machine-inherent yuam kev
• Positional – linear scale raug, pob-screw lead yuam kev, backlash (± 2–5 µm typical).
• Geometric – squareness ntawm axes, spindle qaij, straightness ntawm txoj kev (tsim taper los yog txiv tsawb duab).
• Thermal – 1℃hloov ≈ 11 µm/m ntawm steel txoj kev; kev loj hlob ntawm spindle & ib feem ua rau drift thaum lub sij hawm ntev khiav.
Tool & txiav yuam kev
• Cov cuab yeej hnav – flank hnav VB> 0.05 mm ua kom cov kab uas hla, cov npoo npoo.
• Deflection – L/D > 4:1 ua rau 5–20 µm tswb-lub qhov ncauj lossis teev- iav.
• Chip re-txiav – micro-chips khawb nto, tsa Ra 0.2 → 0.6 µm.
Ua hauj lwm & datum yuam kev
• Fixture clamp force variation – elastic part compression 2–8 µm; tso tawm tom qab un-clamp.
• Datum hloov – lub rooj tsis sib npaug lossis nti hauv qab qhov chaw txav zero 5–15 µm.
• Chuck puab tsaig khiav- tawm – 3- puab tsaig scroll muab 2–6 µm concentricity yuam kev ntawm re-chuck.
Kev ntsuas & sampling yuam kev
• CMM stylus dabtsi yog khoov – 3 hli stylus, 0.2 N quab yuam ≈ 1 µm deflection.
• Kub tsis sib haum - ib feem 5℃warmer tshaj CMM ntxiv ~ 6 µm ntawm 100 mm Al.
• Sampling bias – ntsuas tsuas yog "zoo-zoo" qhov chaw inflates Cpk los ntawm 0.2–0.3.
Khoom siv & kev ntxhov siab yuam kev
• Residual stress release – tom qab 0.5 hli ntawm daim tawv nqaij tshem tawm, Al 7075 qhov chaw warp 10–40 µm ntawm 100 mm ncua.
• Theem hloov – 420 SS cua sov- thaj tsam cuam tshuam nthuav dav 0.01 %, hloov qhov loj 2 µm ib 20 hli.
Ib puag ncig yuam kev
• Khw-pem hauv ntej temp viav vias 2℃/ teev - 200 mm steel qhov loj hlob 4 µm.
• Kev vibration - nyob ze forklift lossis punch xovxwm tuaj yeem tawm cov cim sib sib zog nqus 1–2 µm.
Human / programming yuam kev
• Cov cuab yeej offset typo – 0.1 mm tus yuam sij- nyob rau hauv yuam kev tseem dhau mus saib xyuas yog tias ntsuas 0.15 mm xoob.
• Tsis ncaj cutter comp kev taw qhia – iav- duab feature tawm los ntawm ob zaug cutter vojvoog.
Txoj cai- ntawm-thov pawg- nce
Rau 50 hli txhuas qhov ntawm lub tshuab 3 µm, cia siab tias:
Tshuab 3 µm + Thermal 2 µm + Tool hnav 2 µm + Clamp 2 µm + CMM 1 µm → ± 10 µm tag nrho.
Kev tsim qauv yuav tsum siab dua lossis sib npaug ntawm 20 µm kom ntaus Cpk 1.33.
Hauv qab kab
"Precision" tsis yog lub tshuab spec; nws yog cov lej ntawm txhua qhov yuam kev uas koj txheeb xyuas, ntsuas thiab tswj.
