Mukamva 'opanga zitsulo zopangidwa ndi ufa', malingaliro ambiri amalumphira molunjika ku makina osindikizira-ndi-sinter opangira magiya osavuta kapena mabasi. Ndilo polowera, zedi, koma zili ngati kunena kuti wophika amadziwa kuphika madzi. Kuzama kwenikweni-komanso kumene kupwetekedwa kwa mutu ndi zopambana zimachitika-zili mu unyolo wonse: kuchokera ku kusankha ufa wa alloy ndi njira zamakono zophatikizira monga jekeseni wachitsulo (MIM) kapena kuzizira kwa isostatic pressing (CIP), mpaka kuzinthu zachiwiri zofunika kwambiri. Mafunso ambiri ofufuza amaphonya izi. Amafuna "gawo laufa" koma samatchula kachulukidwe kofunikira, kulekerera kwa post-sintering, kapena ngati ikufunika chithandizo cha kutentha kapena kulowetsedwa. Ndipamene ntchito zimayima kapena zimalephera. Ndaziwona kawirikawiri.
The Alloy Powder Maze
Zimayamba ndi ufa. Sikuti ufa wonse wachitsulo umapangidwa mofanana. Madzi opangidwa ndi maatomu ndi mpweya amakupatsirani mawonekedwe osiyanasiyana a tinthu tating'onoting'ono komanso mawonekedwe oyenda, zomwe zimakhudza momwe ufa umadzazira kufa komanso mphamvu yake yobiriwira yomaliza. Pazigawo zogwira ntchito kwambiri, monga zomwe zimafunikira kupirira kutopa, mukuyang'ana ufa wopangidwa kale - zinthu monga Fe-Ni-Mo yolumikizidwa ndi diffusion kapena magiredi achitsulo osapanga dzimbiri. Kudumpha kwa mtengo ndi kwakukulu, osati zonse ufa zitsulo wopanga amasunga zinthu zambiri. Atha kukhala ndi F-0008 yokhazikika koma amayenera kuyitanitsa china chilichonse, ndikuwonjezera masabata kuti ayambe nthawi.
Ndiye pali chomangira. Kwa MIM, yomwe ndi yabwino kwa ma geometri ovuta, ang'onoang'ono, makina omangira ndi theka lankhondo. Kudulira ndi njira yapang'onopang'ono, yosakhwima; thamangitsani ndipo mupeza ming'alu kapena kupotoza. Ndimakumbukira pulojekiti yopangira zida zopangira opaleshoni pomwe kasitomala adalimbikira kuchita masewera olimbitsa thupi kuti asunge nthawi. Chotsatira? Mpweya wa kaboni udazimitsidwa, zomwe zidapangitsa kuwonongeka. Tinayenera kubwerera mmbuyo, kusintha mawonekedwe a binder, ndi kuchepetsa chirichonse. Chinsinsi cha ufa ndi kudzipereka, osati zomwe mumasinthanitsa mosavuta.
Apa ndipamene kukhala ndi bwenzi lodziwa zambiri zakuthupi kumapindulitsa. Kampani ngati Malingaliro a kampani Qingdao Qiangsenyuan Technology Co., Ltd., mwachitsanzo, amachokera ku maziko akuya popanga ma aloyi apadera. Chidziwitso chazitsulo chimenecho sichimangotha pamene muyang'ana ufa. Kumvetsetsa momwe ma alloys opangidwa ndi nickel amachitira kutentha, mwachitsanzo, amatha kusuntha mwachindunji kuti asungunuke mu mawonekedwe a ufa. Imadziwitsa njira yawo yoyendetsera ng'anjo ya ng'anjo ndi kuziziritsa, zomwe ndi zopangira kapena kusweka kwa katundu womaliza.
Kumanga: Si Nyundo Yaikulu Yokha
Kukanikiza kovomerezeka ndi luso lazokha. Zigawo zamitundu yambiri, zomwe zimakhala ndi makoma owonda kapena kusintha kwakuthwa mu makulidwe, ndizodziwika bwino chifukwa cha kusiyana kwa kachulukidwe. Mutha kuthawa chifukwa cha spacer-stress-stress spacer, koma pachilichonse chokhazikika, kusiyanasiyana kumeneko ndi kofooka. Kapangidwe ka zida apa ndi chilichonse-mndandanda wa nkhonya, dongosolo la chakudya cha ufa. A zabwino ufa zitsulo wopanga idzayendetsa zofananira kuti zifananize kuyenda kwa ufa ndi kuphatikizika musanadulire chida choyamba. Otsika mtengo amalingalira, ndipo mumalipira pang'onopang'ono kusagwirizana.
Kwa mawonekedwe ovuta kwambiri, mumasunthira kupyola kukanikiza. CIP (Cold Isostatic Pressing) imagwiritsa ntchito kuthamanga kwamadzimadzi kuti igwirizane ndi ufa mu nkhungu yosinthika, yopatsa kachulukidwe yunifolomu ngakhale zigawo zomwe zimawoneka ngati pretzel. Kusinthanitsa? Maonekedwe oyambilira ndiwosalondola kwambiri, chifukwa chake mukudzipereka ku makina ochulukirapo mukatha kuyimba. MIM, monga tanenera, ndi chilombo china kwathunthu. Zili ngati jekeseni wa pulasitiki koma ufa wachitsulo woyimitsidwa mu chomangira. Mwatsatanetsatane mwatsatanetsatane ndi wodabwitsa, koma kuchepa kwa mawonekedwe panthawi ya sintering ndikwambiri ndipo kuyenera kuneneratu molondola kwambiri. Kuyendera kwanu koyamba kumakhala kovutirapo.
Ndinkagwira ntchito ndi kasitomala panyumba ya sensa yomwe inali ndi njira zamkati za helical. Kuchikonza kunali koopsa ndipo kuponya sikunathe kumaliza. MIM inali yankho langwiro. Tidapanga ma sintering atatu osiyanasiyana kuti tithane ndi nkhondo, ndipo zokolola zomaliza zimangogunda pafupifupi 85% pakupanga koyamba. Sichingwe chamatsenga chopanga misa; ndi njira yopangira magawo amtengo wapatali, ovuta pomwe mtengo wagawo lililonse umatsimikizira kuyesetsa kwachitukuko.
The Make-or-break: Sintering and Beyond
Sintering ndi kumene matsenga amachitikira-ndipo pamene masoka ambiri amachitika. Sikuti kuphika basi. Ndiko kusinthasintha kwa kutentha komwe kumapangidwa bwino mumlengalenga (hydrogen, nitrogen, vacuum, kapena blend). Kutentha kwanyengo, machulukidwe, nthawi zonyowa, komanso kuthamanga kwa kuziziritsa zonse zimatengera mawonekedwe omaliza, kachulukidwe, ndi makina amakina. A miscalculation kungayambitse matuza, sagging, kapena kusakwanira mgwirizano pakati particles.
Pambuyo pa sintering, gawolo nthawi zambiri silimalizidwa. Ambiri amaganiza kuti gawo losasinthika lakonzeka kutumizidwa. Kwa zigawo zolondola, pafupifupi konse. Nthawi zonse mumafunika maopaleshoni achiwiri. Iyi ndi gawo lofunika kwambiri lolumikizana. A ufa zitsulo wopanga kuti kukanikiza ndi sintering kokha kungakutumizireni gawo lomwe mwaukadaulo sintered koma osagwiritsidwa ntchito chifukwa silingathe kugwiridwa ndi makina. Ichi ndichifukwa chake chitsanzo ku QSY ndichosangalatsa. Mutu wawo uli mkati CNC makina ndi kuponya ndalama. Kwa iwo, kuwonjezera zitsulo za ufa sikungopanga gawo lobiriwira; ndizopereka gawo lomaliza, lokonzekera kukhazikitsa. Atha kuyika mawonekedwe apafupi ndi ukonde ndikugwiritsa ntchito luso lawo lamkati la CNC kuti agwirizane ndi ma diameter ang'onoang'ono kapena mawonekedwe a ulusi, chinthu chomwe sitolo ya PM yochita masewera olimbitsa thupi ingafunikire kutulutsa.
Kuchiza kutentha, kuyanika pamwamba (monga mankhwala a nthunzi kuti asawonongeke), kapena kuika mafuta kuti azidzipaka okha ndi njira zina zachiwiri. Iliyonse imawonjezera mtengo ndi nthawi, koma kuzidumpha kutengera mtengo woyambira ndichuma chabodza. Ndawona magulu amagetsi akulephera kuyesa kumunda chifukwa adanenedwa ngati-sintered akafuna chithandizo choumitsa.
Material Crossovers ndi Ma Synergies Othandiza
Izi zimafika pamlingo wokulirapo waukadaulo ndi kuphatikiza. Nyumba yachikhalidwe ya PM ndi katswiri. Koma kwa wogula, makamaka yemwe amagwira ntchito ndi ma aloyi apadera, pali phindu lalikulu kwa wopanga yemwe amamvetsetsa zitsulo pamachitidwe. Tengani mindandanda ya QSY yopangidwa ndi cobalt kapena nickel. Izi ndi zida zolimba, nthawi zambiri zokwera mtengo zomwe zimagwiritsidwa ntchito potentha kwambiri kapena m'malo owononga. Kuwapanga pogwiritsa ntchito zitsulo za ufa kumatha kupulumutsa kuchuluka kwazinthu poyerekeza ndi makina opangidwa ndi bar stock. Koma kuwakonza ndizovuta. Zomwe adakumana nazo pakupanga ndalama zopangira ma aloyi omwewo zikutanthauza kuti amadziwa kale momwe angawagwiritsire ntchito mumkhalidwe wosungunuka kapena wosungunuka; kuti intuition imatanthawuza kuyang'anira kutentha kwa sintering ndikuletsa kuipitsidwa mu ng'anjo.
Zimakhudzanso kuwongolera khalidwe. Atha kuyang'ana mitundu yofananira ya zolakwika zomwe zingachitike: porosity, inclusions, kukula kwambewu zolakwika. Njira zawo za NDT (zoyesa zosawononga) zitha kupangidwa bwino chifukwa kuponya nthawi zambiri kumafunikira. Chidziwitso chophatikizana ichi ndi chinthu chogwirika chomwe shopu yatsopano ya PM sikhala nayo.
Kuchokera ku kasamalidwe ka polojekiti, imapangitsa zinthu kukhala zosavuta. M'malo molumikizana pakati pa ogulitsa PM, katswiri wamakina, ndi chotenthetsera kutentha, muli ndi malo amodzi olumikizirana omwe amayang'anira kuyenda konse. Kuopsa kwa kuloza zala pamene kulolerana kuphonya pambuyo-machining kumatha. Malingaliro pakati pa gulu loyimba ndi gulu lamakanika amakhala nthawi yomweyo chifukwa ali mnyumba imodzi.
Kupeza Zowona ndi Malingaliro Omaliza
Kotero, pamene mukuyesa opanga zitsulo za ufa, musamangopempha kabuku kothandiza. Funsani za magiredi awo a ufa wokhazikika komanso nthawi yawo yotsogolera pazapadera. Funsani kuti muwone zitsanzo za magawo omwe adachita omwe amafunikira makina achiwiri ndi momwe amawakonzera. Funsani za mlengalenga wokhazikika wa sintering ndi kuwongolera kutentha. Funsani za ntchito yomwe inalephera komanso zomwe aphunzirapo. Mayankho angakuuzeni zambiri kuposa mndandanda wamatani atolankhani.
Malo sali okhazikika. Pakuchulukirachulukira kwa ntchito zopangira zowonjezera ndi ufa wachitsulo, womwe ndi zitsulo zaufa chabe zokhala ndi laser. Mizere ikusokonekera. Wopanga yemwe amakhala mu 1990s press-and-sinter mindset adzalimbana ndi tsogolo lophatikizika, lamtengo wapatali.
Pamapeto pake, zimabwera ku izi: zitsulo za ufa ndi njira yothetsera. Mapeto ndi chigawo chogwira ntchito, chodalirika chachitsulo. Opanga bwino amamvetsetsa ulendo wonse kuchokera ku ufa kupita ku gawo lomaliza, ndipo ali ndi luso lothandizira-monga CNC makina ndi ukadaulo wa aloyi womwe umawonedwa pakampani ngati QSY-kuwonetsetsa kuti ulendowo umatha bwino. Ndi malingaliro athunthu amenewo, kuposa chida chilichonse, chomwe chimalekanitsa opikisana nawo enieni ndi malo ogulitsa ntchito.
