Dab tsi yog qhov zoo ntawm kub isostatic nias (HIP)?
Qhov zoo ntawm Kub Isostatic Pressing txheej txheem
Qhov laj thawj tseem ceeb ntawm kev siv kub isostatic nias yog txhawm rau tshem tawm qhov pores los txhim kho cov khoom siv ntawm cov hlau; Raws li tau hais ua ntej, qhov sib txawv ntawm sintering ntom tau los ntawm cov hlau txhaj tshuaj molding yog siab txaus. Tsuas yog qee qhov me me ntawm qhov pores, tag nrho cov pores hauv qhov raug kaw, yog li qhov ntom ntom tuaj yeem ua tiav yam tsis siv cov hmoov filling, uas yog cov qauv siv rau kev tsim kub isostatic pressed steel billets. Rau cov lag luam nrhiav kev ntseeg siabMIM kub isostatic pressing solutions tsum, kub isostatic nias tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom kawg; nws densifies qhov chaw, yog li muab cov khoom ua tau zoo dua, ntau qhov ntev ntev, zoo dua nto tiav, thiab txo qhov tshwm sim ntawm kev tsim qhov qhib qhov pores thaum polishing. Daim duab 9.2 qhia txog microstructure (a) ntawm 316L hlau txhaj molded ib feem sintered ntawm 1 350℃thiab microstructure (b) nyob rau hauv kub isostatic nias ntawm 105 MPa thiab 1 100℃. Nws tuaj yeem pom los ntawm daim duab uas cov pores hauv cov khoom ploj tom qab kub isostatic nias, thiab cov nplej loj tuaj. Cov qoob loo loj hlob kuj tau pom nyob rau hauv cov hlau txhaj tshuaj molded qhov chaw ntawm 17-4PH SS thiab F2886. LaGoy tau tshaj tawm tias cov nplej loj tau nce 5 mus rau 6 npaug, thiab Sago tau tshaj tawm tias cov nplej loj tau nce 3 zaug.
Kub isostatic nias tuaj yeem ua kom cov ntaub ntawv uas tsis muaj qhov qhib qhov hws. Daim duab 9.3 qhia tias tsis yog -densifiable thiab densifiable pores.
Lwm qhov txiaj ntsig ntawm kub isostatic nias ncej- kev kho mob ntawm cov hlau txhaj tshuaj molded qhov chaw yog kev txhim kho qhov sib xws ntawm qhov chaw. Txij li thaum kub isostatic nias tuaj yeem ua tiav qhov siab tshaj plaws ntawm qhov chaw, qhov sib txawv ntawm qhov sib txawv ntawm qhov chaw tom qab kub isostatic nias yuav tsawg heev. Qhov txiaj ntsig no tau siv dav los ntawmprecision hlau txhaj molding qhov chaw chaw tsim tshuaj paushauv kev tsim khoom loj. Ib txoj kev sintering feem ntau yog sinter ntau qhov chaw hauv lub cub tawg. Vim hais tias qhov kub thiab txias ntawm qhov cub sintering sib txawv los ntawm ntug ntawm qhov chaw ua hauj lwm mus rau qhov chaw ntawm qhov chaw ua hauj lwm, yog tias qhov densification℃ntawm qhov chaw nyob rau hauv qhov chaw nce mus txog 98%, thaum lub densification℃ntawm ib feem ntawm ntug yuav yog 96%, yuav muaj qhov sib txawv ntawm ob qhov chaw. Yog tias ob qho tib si raug muab tso rau hauv lub qhov cub kub isostatic nias, qhov densification℃ntawm ob qhov chaw tom qab kev kho mob yuav nyob ze rau 100%, thiab qhov kawg qhov ntev yuav nyob ze dua.
Kub isostatic nias kev kho mob ntawm kev txhaj tshuaj molded qhov chaw tuaj yeem txhim kho cov khoom siv ntawm kev txhaj tshuaj molded qhov chaw. Txoj cai empirical nyob rau hauv hlau hmoov molding yog hais tias raws li kev ceev nce, ib feem ntawm kev ua tau zoo yuav tsum tau txhim kho, hardness, yield zog (YS) thiab qhov kawg tensile zog (UTS) tag nrho yuav zoo dua mus rau ib yam dab tsi, tab sis qhov tseem ceeb tshaj plaws yog cov dynamic zog ntawm qhov chaw, xws li elongation, qaug zog tiv thaiv thiab cuam tshuam lub zog, uas yog yooj yim rau kev txhim kho microstructure. isostatic nias kev kho mob. Ntausiab -Kev ua tau zoo MIM cov khoom lag luamsau MIM-HIP raws li tus txheej txheem rau aerospace thiab kev kho mob- qib qib. Table 9.2 qhia txog kev sib piv ntawm cov khoom siv kho tshuab ntawm MIM thiab MIM-HIP qhov chaw.
Table 9.2 Kev sib piv ntawm Mechanical Properties of MIM thiab MIM/HIP Parts
| Khoom siv | Qhov ceev /% | YS / MPa | UAS / MPa | Elongation /% | Impact Zog / J |
|---|---|---|---|---|---|
| 17-4PH Precipitation Hardening Stainless Hlau (MIM) | 98.51 | - | - | - | 5.4 |
| 17-4PH Precipitation Hardening Stainless Hlau (MIM / HIP) | 99.89 | - | - | - | 9.5 |
| 17-4PH Niam Alloy (MIM) | 92.39 | - | - | - | 6.8 |
| 17-4PH Niam Alloy (MIM/HIP) | 100 | - | - | - | 20.3 |
| F2886 (MIM) F75 | 95 | 552 | 897 | 15 | - |
| F2886 (MIM/HIP) F75 | 100 | 552 | 897 | 20 | - |
| F562 (MIM) | 95 | 379 | 758 | 30 | - |
| F562 (MIM/HIP) | 100 | 345 | 793 | 60 | - |
| F2885 (MIM) Ti-6Al-4V | 97 | 869 | 910 | 13.5 | - |
| F2885 (MIM/HIP) Ti-6Al-4V | 100 | 958 | 980 | 13.0 | - |
Ntxiv nrog rau kev txhim kho cov khoom siv, cov txheej txheem kub isostatic nias kuj txhim kho polishability ntawm qhov chaw. Polishing yog txheej txheem ntawm kev tshem tawm cov khoom ntawm qhov chaw, uas tuaj yeem raug tshem tawm los ntawm kev siv tshuab polishing lossis electropolishing. Raws li cov khoom raug tshem tawm tas li, qee cov khoom yuav raug nthuav tawm. Yog tias muaj qhov pores nyob rau hauv qhov chaw ntawm qhov chaw, qhov pores yuav raug nthuav tawm tom qab polishing, ua rau qhov tsis sib xws. Lub qhov hws tawm tau yooj yim thaiv los ntawm polishing xov xwm (cov kuab tshuaj lossis lwm yam khoom paug) thiab tuaj yeem ua rau txo qis ntawm qhov zoo thiab muaj peev xwm kis tau ntawm ib feem. Yog hais tias ib feem raug kub isostatic nias ua ntej polishing, yuav tsis muaj qhov pores ntawm qhov chaw kho, qhov kev ncaj ncees ntawm qhov chaw yuav zoo dua, thiab kev huv ntawm qhov chaw yuav zoo dua; thaum nyob rau hauv cov qauv uas tsis tau raug kub isostatic nias, lub qhov hws tawm tuaj yeem muaj cov kab mob, uas yuav ua rau muaj qhov tsis xws luag thaum electroplating thiab ua rau cov kab mob loj hlob hauv daim ntawv thov kev kho mob. Cov yam ntxwv no ua rau HIP indispensable raukev kho mob ntaus ntawv hlau txhaj tshuaj molding tsumua raws li xoom- qhov xav tau ntawm qhov chaw tsis raug.
Kub isostatic nias kuj txhim kho cov weldability ntawm hlau txhaj molded qhov chaw. Alloys uas muaj qhov hws muaj qhov tsis zoo vuam kev ua tau zoo, yog li siv kub isostatic nias kom tshem tawm qhov pores tuaj yeem txhim kho qhov zoo ntawm vuam. RauAutomotive precision MIM qhov chaw tsim khoomuas xav tau ncej-welding los ua ke, xaiv aMIM + HIP integrated service tsum tsumtuaj yeem txo qis qhov tsis xws ntawm vuam thiab txhim kho tag nrho cov kev ntseeg tau.