Xa iinjineli zichaza iinxalenye zentsimbi ezichane kakhulu kwizivalo zehydraulic, izindlu zempompo, okanye iishafti zewintshi—ingakumbi phantsi koxinzelelo oluphezulu, iimeko ezinxitywe kakhulu okanye ezidlekayo—azifuni nje umthengisi. Bafuna a mim metal naliti yokubumba inkqubo yokubumba umzi-mveliso oqonda ukuziphatha kwe-metallurgical, ukuzinza kwe-dimensional, kunye neendlela zokungaphumeleli zokusebenza-kungekhona nje ukunyamezela kumzobo.
Sibone iiprojekthi ezininzi kakhulu zimile kwinqanaba leprototype kuba umenzi okhethiweyo uphathe iMIM "njengenye nje inkqubo yokubumba." Enyanisweni, i-MIM ephumeleleyo yamacandelo abalulekileyo emishini ifuna ukuhlanganiswa okuqinileyo phakathi kokukhethwa komgubo, ukuqulunqwa kwe-binder, i-kinetics ye-debinding, ulawulo lweprofayili ye-sintering, kunye ne-post-sinter machining. Kwi-QINGDAO QIANGSENYUAN TECHNOLOGY CO., LTD., Siphatha yonke inxalenye ye-MIM njengesihlalo sevalve ye-cobalt-nickel ye-alloy: i-misstep enye kulawulo lwekhabhoni ngexesha le-sintering inokubangela i-microcracking phantsi kwe-300-bar yokulayisha i-cyclic. Yiyo loo nto indawo yethu ethobela i-ISO eQingdao ingakhuphi umjikelo we-thermal ogcweleyo, ukusuka kwi-650 ° C i-catalytic debind ukuya kwi-1280 ° C ivacuum sintering kunye nokubekwa kweliso kwindawo yombethe.
Uninzi lwabathengi aluhoyi isithintelo esibalulekileyo: i-MIM iyagqwesa kubume obuntsonkothileyo-kodwa kuphela ngaphakathi kwemida engqongqo yejometri. Ubukhulu bodonga kufuneka buhlale phakathi kwe-1.5 mm kunye ne-8 mm. Umyinge womlinganiselo ongaphezulu kwe-6:1 umngcipheko woxinaniso lwegradient. Iindlela zangaphantsi? Inokwenzeka-kodwa kuphela nge-collapsible ceramic cores, kungekhona izixhobo eziqhelekileyo. Siye sanceda abathengi baphinde baqulunqa iimpompo ze-AMS 5387 cobalt alloy alloy ukuphelisa i-radii yangaphakathi ebukhali, ukusika ukugqwesa kwe-sintering ngama-40% ngelixa ugcina ingqibelelo yokuhamba-kwendlela. Ayiyothiyori leyo. Yinto eyenzekayo xa wakho mim metal naliti yokubumba inkqubo yokubumba umzi-mveliso iqhuba i-120+ MIM amaqashiso ngonyaka kwizitokhwe zodidi lwe-aerospace-kwaye ifaka yonke ireyithi yokucutheka, i-warpage vector, kunye nokutenxa koxinzelelo kwibhetshi nganye.
Nantsi into eyahlula ukuchaneka kwe-MIM kwi-MIM yorhwebo:
- Ukulandeleka kwezinto kuqala ngaphambi kokuba umgubo ungene kwi-hopper: Sifumana i-Gas-atomized CoCrMo kunye ne-T800 ye-alloy powders eqinisekisiweyo kunye neengxelo ezipheleleyo ze-PMI-kwaye siqinisekise umxholo we-oksijini, ukusabalalisa ubungakanani be-particle (D50 = 8.2-9.6 µm), kunye ne-batch density ebonakalayo.
- Ukuboleka akumiselwanga xesha-kuyajongwa: Endaweni yobude bexesha elimiselweyo lokufunxa, silandelela ukulahleka kobunzima bexesha lokwenyani kusetyenziswa izinzwa zegravimetric. I-binder ye-0.3% eseleyo ibangela ukulungiswa kweprofayili ngokuzenzekelayo-kuba ukususwa okungaphelelanga kubangela ukuqunjelwa; over-debinding umema ukuqhekeka.
- Iiprofayili ze-Sintering ziyinxalenye ethile, ayithethi ngqo kwiziko: Indlu yepiston yepompo yesilinda ifumana irempu ecothayo nge800–1000°C kunombhobho wecandelo elibhityileyo. Sihlengahlengisa amaxesha okuhlala ngokusekwe kwimodeli ye-thermal mass-hayi itshathi ephambili.
- Ijiyometri ye-Post-sinter ayixoxisi: Yonke inxalenye ye-MIM ihlola i-CMM ngokuchasene neefowuni ze-GD & T-hayi nje imilinganiselo. Silinganisa ukucaba kumphezulu wokutywina ukuya ku-±1.2 µm, isilinda kwijenali ye-shaft ukuya kwi-0.8 µm, kunye noburhabaxa bomphezulu (Ra) kwiindlela ezilulwelo ukuya kwi-≤0.4 µm-ingqinwe nge-optical profilometry.
Abanye banokuphikisa ukuba ukwenziwa kwe-CNC kuzisa ukuchaneka okungcono kune-MIM. Yinyani-kwiijometri ezilula. Kodwa zama ukubamba ± 0.015 mm ukugxila kwiibhore ezihlanu ze-coaxial kwisiseko sempompo yentsimbi engenastainless ye-316L, nganye inemisonto yangaphakathi kunye namazibuko okuthambisa adityanisiweyo. Ukucupha loo ndawo kufuna ukuseta ezintandathu, utshintsho oluthathu, kunye nokukhukuliseka okungenakuthintelwa. Inguqulelo yeMIM? Inxalenye enye eluhlaza, enye i-sinter, enye yokugqiba umsebenzi-kunye ne-22% yexabiso eliphantsi lilonke kwimiqulu engaphezu kwe-500 pcs / ngonyaka. Siyayingqina loo nto: kwikota yokugqibela, sizise i-1,200 T800 ye-alloy center shaft rollers yenkqubo yobunjineli yewinch yemoto. Zonke zigqithise i-100% yovavanyo lomthwalo osebenzayo kwi-18,500 N axial force-zero rework.
Oko kuthembeka kuvela kuhlanganiso oluthe nkqo onokuthi uluqinisekise. Indawo yethu ayihlali nje ngoomatshini bokushicilela be-MIM kunye neziko le-sinter-kodwa kunye namaziko e-CNC achanekileyo akwazi ukuguqula iinxalenye ze-CoCr eziguquguqukayo kwi-85 HRC, ii-oveni zonyango lobushushu zilinganiswe ukuya kwi-± 2 ° C, kunye nemigca yokudlula ehambelana ne-ASTM A967. Xa umxhasi ethumela umzobo weplagi ye-AMS 5387 enemingxuma engaboniyo kunye nobuso obutywiniweyo obutywiniweyo, asibuzi ukuba "Ngaba ungayenza?" Siyabuza: "Yintoni imeko yoxinzelelo olubi kakhulu? Yintoni ubomi benkonzo obulindelekileyo? Yeyiphi imo yokungaphumeleli ekugcina uphaphile?" Emva koko sikhetha i-feedstock efanelekileyo, silinganisa ukuguqulwa kwe-sintering kwi-Simufact Additive, ukwakha isikhunta ngentsimbi eqinile ye-H13 kunye neendlela zokupholisa ezihambelanayo, kunye nokutshixa iiparitha zenkqubo ngaphambi kokudubula kokuqala.
Ukuba uvavanya a mim metal naliti yokubumba inkqubo yokubumba umzi-mveliso, tsiba iincwadana ezinemifanekiso. Cela oku: (1) iirekhodi ze-sintering lot ebonisa ukuxinana kokutshintsha kwimveliso, (2) Iingxelo ze-CMM zithelekisa i-as-sintered vs. ijometri egqityiweyo ngenxalenye efana neyakho, kunye (3) nobungqina besatifikethi sezinto eziphathekayo kwibakala lakho le-alloy ngqo-kungekhona nje "ISO 13322-2 powder compliant." Kwi-QINGDAO QIANGSENYUAN TECHNOLOGY CO., LTD., Loo maxwebhu awatshixwanga kwikhabhinethi yeefayile. Zincanyathiselwe kuyo yonke i-PO, zihlaziywa ngexesha lokwenyani, kwaye kwabelwana ngazo ngaphambi kokuvunywa kwezixhobo. Kuba ukuchaneka akulosebe. Luseto olumiselweyo.
