Yog vim li cas kev kho cua sov ua rau Dimensional hloov nyob rau hauv Hlau 3D Printing Parts
Tus neeg tsav tsheb tseem ceeb yog kev tso tawm cov kev ntxhov siab uas nyob hauv lub sijhawm ua kom nrawm nrawm thiab khov kho ntawm cov txheej txheem SLM. Raws li kev ntxhov siab so thaum lub sijhawm cua sov, qhov chaw tuaj yeem hloov pauv, ntsws, lossis twist.
Lwm yam tseem ceeb muaj xws li:
Thermal expansion thiab contraction thaum lub sij hawm cua sov / cua txias mus.
Theem transformations uas ua rau lub ntim hloov (xws li, nyob rau hauv titanium alloys).
Cov qauv kev txhawb nqa cuam tshuam - kev txhawb nqa tuaj yeem txwv kev cuam tshuam hauv qee qhov chaw thaum tso cai rau lwm tus.
Ti-6Al-4V txha caj qaum nyob rau hauv qhov kev ntxhov siab ntawm 800℃tau ntsib 0.15-0.25 hli warpage thoob plaws nws 80 hli ntev. Qhov no yog txaus los thawb qhov tseem ceeb mating nto tawm ntawm kam rau ua.
Hlau 3D luam ntawvdimensional hloov thaum lub sij hawm kho cua sov yog ib tug ncaj qha tshwm sim ntawm lub cim thermal keeb kwm ntawm additive manufacturing.
Yuav Ua Li Cas Hloov Qhov Dimensional Koj Yuav Tsum Tau Zoo?
Feem ntau qhov txawv txav rau cov txheej txheem kev ntxhov siab yog 0.1-0.5% kev hloov pauv, txawm hais tias qhov no txawv txav los ntawm geometry thiab txheej txheem. Complex geometry, nyias phab ntsa, thiab ntev overhangs amplified distortion. HIP nyiam tsim ntau yam sib xws (tab sis qee zaum loj dua) kev hloov pauv vim muaj kev ntxhov siab, thaum kev ntxhov siab yooj yim ua rau muaj kev sib ntaus sib tua hauv cheeb tsam.
Cov ntaub ntawv rooj: Hom Dimensional Hloov Ranges
|
Khoom siv |
Kev ntxhov siab |
HIP |
Kev kho mob & Kev laus |
Sau ntawv |
|
Ti-6Al-4V |
0.1–0.4% |
0.2–0.6% |
0.15–0.5% |
Phase transformation rhiab heev |
|
316L Stainless hlau |
0.05–0.25% |
0.1–0.3% |
N/A |
Tus txheeb ze ruaj khov |
|
CoCr Alloys |
0.1–0.35% |
0.15–0.4% |
0.2–0.45% |
Carbide cuam tshuam |
|
ib 718 |
0.08–0.3% |
0.1–0.35% |
0.1–0.4% |
Zoo stability |
|
AlSi 10Mg |
0.2–0.7% |
Kev siv tsawg |
N/A |
Siab rhiab heev |
SLM dimensional kam rau ua ncej- kev ua tiav yuav tsum tau npaj ua ntej.
Khoom siv -los ntawm- Cov Khoom Siv Dimensional Behavior Hauv Kev Kho Mob Kub Kub
Ti-6Al-4V: rhiab heev vim qhov hloov pauv / theem nyob ze 882℃(beta transus). Distortion muaj ntau yog tias tsis ua tib zoo tswj.
316L Stainless Hlau: Ntau ruaj khov tab sis yuav tsum tau zam ntawm qhov kev xav tau ntau yam (450-850 degree).
CoCr Alloys: Volume hloov ntawm carbide nag lossis daus.
Inconel 718: Kev ruaj ntseg zoo tab sis tau txais txiaj ntsig los ntawm kev txhim kho thaum laus.
AlSi10Mg: heev distortion-nrawm; txwv rau qhov kub thiab txias.
17-4PH: Predictable contraction thaum laus.
Cov ntaub ntawv cov ntaub ntawv: Khoom siv -Txoj cwj pwm tshwj xeeb
|
Khoom siv |
Hom Temp Range |
Theem Hloov Risk |
Hom Linear Hloov |
|
Ti-6Al-4V |
700-950 degree |
Siab |
0.1–0.5% |
|
316L |
600-1100 degree |
Nruab nrab |
0.05–0.3% |
|
AlSi 10Mg |
200-300 degree |
Tsawg |
0.2–0.7% |
Lub luag haujlwm ntawm Kev Tsim Ib Ntu hauv Kev Tswj Kev Hloov Pauv Dimensional
Kev tsim qauv ntse txo qis kev pheej hmoo:
Txhim kho cov phab ntsa tuab.
Siv symmetry thiab sib npaug loj faib.
Optimize cov qauv kev txhawb nqa kom txwv cov chaw tseem ceeb.
Orient qhov chaw ntawm lub phaj tsim kom txo qis overhang distortion.
Ntxiv machining Tshuag ntawm nruj - kam rau ua nta.
Cov ntaub ntawv rooj: Tsim Feature vs Distortion Risk
|
Tsim Feature |
Distortion Risk |
Lub tswv yim Mitigation |
|
Nyias phab ntsa (<2mm) |
Siab |
Ntxiv tav los yog kev txhawb nqa ib ntus |
|
Ntev overhangs |
Siab |
Optimize orientation + kev txhawb nqa |
|
Asymmetric geometry |
Siab |
Sib npaug loj los yog siv fixturing |
|
Cov ntu tsis sib xws |
Tsawg |
Txheem kev ntxhov siab |
Hlau 3D luam ntawv tsim rau kev kho cua sov (DfAM) yog qhov tseem ceeb.
Fixturing thiab txheej txheem tswj uas Minimize Distortion
Kev cai fixtures txwv kev txav mus los tsis tsim kev ntxhov siab tshiab.
Tswj tus nqi ramp thiab qeeb txias yog qhov tseem ceeb.
Lub tshuab nqus tsev lossis cov pa cua tsis zoo txo oxidation-txog teeb meem.
HIP feem ntau tsim cov isotropic shrinkage ntau dua piv rau dawb - sawv ntsug annealing.
Ib lub chaw tsim khoom ua Inconel 718 aerospace brackets siv kev cai graphite fixtures thaum laus, txo qhov seem tawg ntawm ± 0.3 hli mus rau ± 0.08 hli ntawm 150 hli nta.
Predicting Dimensional Hloov
FEA-raws li kev hloov pauv hloov pauv muaj txiaj ntsig tab sis yuav tsum muaj kev lees paub nrog cov ntaub ntawv AM tiag. Empirical ua ntej- nyiaj them rov qab (scaling los yog ua ntej-distorting STL) thiab thawj-kab tshuaj ntsuam xyuas yog tus qauv. Cov neeg muag khoom ua lag luam khaws cov ntaub ntawv - thiab txheej txheem - cov ntaub ntawv tshwj xeeb.
Ncej -Heat-Kev Kho Mob Machining
Machining tom qab kev kho cua sov yog txoj hauv kev txhim khu kev qha tshaj plaws kom ua tiav qhov siab ntev. Tawm 0.2-1.0 hli Tshuag nyob ntawm qhov nta thiab cov khoom siv. CNC xov, EDM, thiab sib tsoo feem ntau yog siv.
Cov ntaub ntawv rooj: Pom zoo Machining Tshuag pub nyiaj
|
Hom Feature |
Ti-6Al-4V |
316L |
Inconel |
|
Kev sib raug zoo |
0.5-0.8 hli |
0.3-0.6 hli |
0.4-0.7 hli |
|
Qhov chaw dav dav |
0.3mm ib |
0.2 hli |
0.3mm ib |
Dimensional Verification tom qab kev kho cua sov
Siv CMM rau qhov loj me, 3D scanning rau tag nrho kev sib txawv ntawm daim ntawv qhia, thiab tsom mus rau GD&T nta xws li flatness, parallelism, thiab qhov tseeb txoj hauj lwm uas cuam tshuam feem ntau los ntawm distortion. Tsim ib lub database rau rov ua ntu.
Cov lus nug nquag
Puas yog kev kho cua sov ua rau cov hlau 3D luam tawm?
Nws tuaj yeem ua rau shrinkage, expansion, los yog warpage nyob ntawm cov alloy, txheej txheem, thiab geometry. Feem ntau me ntsis shrinkage los yog localized distortion.
Kuv yuav tsum tau hloov pauv ntau npaum li cas tom qab kev ntxhov siab ntawm SLM Ti-6Al-4V?
Feem ntau 0.1-0.4% linear, nrog warpage txog 0.2-0.5 hli ntawm qhov loj dua. Cov txiaj ntsig tseeb nyob ntawm qhov geometry thiab cov ntsuas.
Koj puas tuaj yeem tshuab hlau 3D luam tawm tom qab kev kho cua sov?
Yog - qhov no yog tus qauv coj ua kom ua tiav qhov kev zam nruj kawg.
Dab tsi yog txoj hauv kev zoo tshaj los tswj kev cuam tshuam thaum kho cua sov ntawm SLM qhov chaw?
Muab cov khoom zoo DfAM (cov khoom sib xws, kev txhawb nqa), kev kho kom zoo, kev tswj tus nqi, thiab tom qab- cov khoom lag luam.
Puas yog HIP ua rau muaj kev hloov pauv ntau dua li kev ntxhov siab rau kev ntxhov siab?
HIP feem ntau ua rau muaj kev sib txawv ntau dua vim yog lub siab tab sis tuaj yeem kwv yees ntau dua li kev sib tsoo dawb.
Kuv yuav txheeb xyuas qhov tseeb li cas tom qab kev kho cua sov ntawm cov hlau 3D luam tawm?
Siv CMM, 3D scanning, thiab sib piv rau ua ntej - thiab tom qab - ntsuas kev kho mob nrog rau GD&T.