Vim li cas stainless hlau xav tau "kev saib xyuas ntxiv"
Thermal conductivity tsuas yog 16 W m⁻¹ K⁻¹ (≈ ¼ ntawm carbon steel) - 70% ntawm cov cua sov yog daig ntawm cov cuab yeej.
Ua haujlwm- hardening exponent 0.3–0.5: txhua qhov kub hnyiab> 650℃ua rau nyuaj "dawb txheej" uas rhuav tshem cov ntxig tom qab ib qho dhau los.
Ntev, ductile chips yooj yim weld rau ntawm ntug (ua -nce ntug) yog tias lub interface tsis muaj cov zaj duab xis lubricating.
Coolant -los yog -Lube? Sib piv txoj haujlwm txoj haujlwm ntawm "Cooling ↔ Lubrication spectrum"
Siab- nrawm nrawm (Vc 150 m min⁻¹, lub teeb load) - txias dominates; tsom rau qhov qis tshaj plaws tau txiav - cheeb tsam kub kom loj.
Tsawg- ceev hnyav roughing (Vc 80 m min⁻¹, ap 2 mm) – lubrication dominates; txo kev sib txhuam thiab BUE.
Flood Coolant (tseem yog lub neej ntawd rau 303/304/316L)
Chemistry: 6–8 % semi-cov kua hluavtaws nrog EP chlorine- pob dawb (sulfurized fat + phosphate ester).
Lub hom phiaj concentration 8-10% rau stainless; <60 ppm chloride kom tsis txhob pitting thaum lub sij hawm khiav ntev.
pH qhov rais 8.5–9.2; hauv qab 8.3 lub passive Cr- oxide zaj duab xis ntawm 316L tawg.
Flow rate Ntau tshaj lossis sib npaug li 15 l kW⁻¹; siab 7 MPa (1 000 psi) los ntawm - cuab yeej los rhuav tshem cov chips thiab poob kub 120-150℃.
Cov txiaj ntsig: cuab yeej lub neej ↑ 30%, Ra ↓ 0.2 µm, Cpk stabilized > 1.67 ntawm 50-ib qhov kev sim.
Ncaj / Siab -Cov Roj Roj (rau qis- nrawm, siab- torque txiav)
Siv rau ntawm Swiss-hom tshuab dhos lossis sib sib zog nqus- qhov rab phom ntawm 17-4 PH (< 60 m min⁻¹).
Muaj 2% active sulfur + 1 % phosphorus; muab 180 N weld-load zaj duab xis lub zog, tiv thaiv BUE thaum pub> 0.2 hli rev⁻¹.
Cov cua txias tsis zoo: ntxiv ib qho huab cua- moj tej tawg extractor kom tsis txhob muaj pa taws; Qhov hluav taws kub yuav tsum yog> 180 degree.
Yam tsawg kawg nkaus -Quantity Lubrication (MQL) - kev hloov kho kom ruaj khov
5-30 ml h⁻¹ ntawm ester{2}}raws li roj nqa hauv 0.5 MPa cua; droplet loj 1-2 µm, nkag mus rau hauv capillary cheeb tsam ntawm lub dav hlau shear.
Lub ntsej muag-milling GTD-450 martensitic stainless: MQL txiav cov cuab yeej hnav 21.6 % thiab txhim kho Ra 25 % piv rau qhuav; tuav dej nyab ntawm Ra tab sis sib npaug ntawm hnav.
Qhov zoo tshaj plaws rau nruab nrab -lub luag haujlwm milling, tapping, reaming; tsis yog rau qhov sib sib zog nqus qhov twg nti khiav tawm xav tau kua tshaj tawm.
Cryogenic & Hybrid Cooling (advanced)
Kua-N₂ lossis CO₂ daus ntawm -196℃/-78 degree, nrog lossis tsis muaj MQL cov tee dej (CMQL).
Txiav -zone temp kom qis dua 250 degree, inhibiting diffusion hnav ntawm TiAlN inserts; cuab yeej lub neej ob npaug thaum kawg -milling 316L ntawm Vc 180 m min⁻¹.
Yuav tsum tau insulated tooling, kev nyab xeeb tso pa; ROI zoo ntawm aerospace qhov chaw uas ntxig tus nqi> USD 18 ib ntug.
Micro-Pocket Delivery - los ntawm - cov cuab yeej capillary channels
Xaus-mills nrog 0.8 hli ncaj dej txias ducts tsa tawm -chips kub 40℃qis dua peripheral dej nyab; ncua lub neej 1.8 × ntawm 1.4112 stainless.
Kev Saib Xyuas & Kev Tu
Xyuas qhov concentration ob zaug ib zaug (tes- tuav refractometer); 1% drift hloov cuab yeej lub neej 8-10%.
Sump skimmer + 5 µm lub hnab lim khaws cov tshuaj chloride <40 ppm thiab tiv thaiv kab mob Bloom (odor, dermatitis).
Cov ntaub ntawv SOP: hloov cov kua dej txhua txhua 6-8 lub lis piam rau kev ua haujlwm tsis muaj dej, huv si nrog biocide, log pH thiab conductivity.
Rule of Thumb Summary
303/304/316L dav machining → 8% chlor-dawb semi- hluavtaws, 7 MPa los ntawm - cuab yeej dej nyab.
Tsawg- ceev threading / broaching → compounded ncaj roj + cua rho tawm.
Nruab nrab-duty eco phiaj → MQL 10 ml h⁻¹; validate nti khiav tawm.
High-tus nqi, nruj- kam rau ua aerospace → CMQL lossis LN₂; nqis peev hauv kev ruaj ntseg infrastructure.
