Xa usiva 'isitofu sensimbi engenastainless' okanye iMIM, inowuthi ekhawulezileyo isoloko imalunga nokuntsokotha kunye nokumila komnatha. Kodwa ekubeni ndikunye oku kangangethuba elithile, ndifumanisa ukuba elona bali lokwenyani alikho kwincwadana eqaqambileyo; ikwiinkcukacha zegritty zokwenza i-17-4PH yesibiyeli ibambe i-0.005 ibhetshi yokunyamezelana emva kwebhetshi, okanye kutheni indawo eyenzelwe umatshini ihlala isilela ngokulusizi xa uyitshintshela kwi-MIM. Kukho ingcamango ephosakeleyo yokuba i-MIM yinto nje yokubumba inaliti yeplastiki ngomgubo wesinyithi-akunjalo. Amanqanaba okudibanisa kunye ne-sintering azisa izinto eziguquguqukayo ezinokuthobisa neyona nkqubo injineli inamava. Lirhamncwa elixubileyo, elihleli phakathi kokuphosa kunye nomatshini, kwaye lifuna intlonipho yencwadi yalo yomthetho eyodwa.
Umdaniso weMaterial: AyisiyoNtsimbi nje engenaStainless
Awunakutsho nje intsimbi engatyiwayo kwaye uyibize ngosuku. Kuba ukubumba inaliti yentsimbi, iimpawu zomgubo zizinto zonke. Ukuhanjiswa kobungakanani besuntswana, imilo, kunye nokuqukuqela ngenkqubo yokubopha ukwenza okanye ukwaphula inxalenye. Siqhube imisebenzi kunye ne-316L kunye ne-17-4PH ubukhulu becala, kodwa nangaphakathi kula mabanga, umthengisi womgubo owahlukileyo unokutshintsha yonke into yokucutheka kwe-sintering. Ndikhumbula iprojekthi yecandelo lesixhobo sotyando apho i-spec yabiza i-316L yokuxhathisa umhlwa. Iibhetshi ezimbalwa zokuqala zantywila kakuhle, kodwa amandla okudinwa aphelile. Kuvela, umxholo we-oksijeni kwi-powder, into esingazange siyihlolisise ngokwaneleyo, yayiyi-tad ephezulu, ekhokelela ekufakweni kwemizuzu. Satshintshela kumgubo wegesi-atomized kunye ne-spec eqinile, kwaye yayisombulula. Ngala ma-nuances ahlula iprototype ukusuka kwicandelo elilungele imveliso.
Kulapho ukuba nemvelaphi kumsebenzi wesinyithi obanzi kubaluleke kakhulu. Ukusebenza neqabane elinje Qingdao Qiangsenyuan Technology Co., Ltd. (QSY), ngubani onamashumi eminyaka kwi-investment casting kunye ne-CNC ye-machining ye-stainless steels kunye ne-alloys ezikhethekileyo, ufumana loo nto ingqiqo yezinto eziphathekayo. Ayingomgubo wokucofa nje; bayayiqonda indlela isinyithi esiziphatha ngayo phantsi kobushushu kunye noxinzelelo oluvela kwii-angles ezininzi zokuvelisa. Olo lwazi lwenkqubo enqamlezileyo lwazisa uqheliselo olungcono lwe-MIM-ukwazi, umzekelo, ukuba i-sintered 304 inokuziphatha njani ngendlela eyahlukileyo phantsi kokusebenza kwendawo ye-CNC elandelayo xa kuthelekiswa nokulingana kwayo.
Isigaba sokususa isibophelelo ngumbulali othuleyo. Ukukhawuleza, kwaye ufumana iintanda okanye amadyunguza; ucotha kakhulu, kwaye ubulala i-ovenput yakho kunye neendleko. Kwiinsimbi ezingenasici, ulawulo lwekhabhoni ngexesha lokudibanisa lubalulekile. Shiya intsalela yekhabhoni eninzi, kwaye uchaphazela ukuxhathisa kokubola-esona sizathu sokuba ukhethe i-stainless kwasekuqaleni. Sifunde oku ngendlela enzima kwiprojekthi yokuqala yekliphu yezixhobo zaselwandle. Amalungu aphumelele iitshekhi ezinobukhulu kodwa akaphumelelanga kuvavanyo olulula lwesitshizi setyuwa. Oyena nobangela ibikukungagqitywanga komjikelo we-thermal debind oshiye i-carbon ngasemva, ichitha ichromium ekuhlaleni. Inkqubo ehlaziyiweyo, yokukhutshwa kwamanqanaba amaninzi iyilungisile. Sisikhumbuzo sokuba kwi-MIM, awugcini nje ukubumba isinyithi; wakha ngobunono ngokutsha ubume bayo obuncinci ukusuka kumgubo.
Uyilo lwe-MIM, hayi nje uMsebenzi
Le yeyona ndawo inkulu yokungqubana neenjineli zoyilo. Banikezela ngenxalenye eyenzelwe umatshini okanye utyalo-mali kwaye balindele ukuba iMIM iyenze. Ayisebenzi ngolo hlobo. Ubungqingqwa bodonga obufanayo yivangeli. Sasinomthengi onyanzelisa i-flange ene-hub eshinyeneyo kunye ne-radial fins. Inxalenye yajija njengetshiphu yeitapile ngexesha lokuntywila ngenxa yokuba umahluko wawumkhulu. Kwafuneka sibuyele umva, sibonisane songeza iigussets ezincinci kunye nokujiya kancinane amaphiko, okongeza ubunzima obungabalulekanga kodwa ugcine yonke ijometri. Isixhobo kwafuneka siguqulwe, kunjalo. Ngumdaniso odibeneyo, ngamanye amaxesha ophindaphindayo.
Iimpawu ezinjengee-undercuts kunye neentambo zangaphakathi apho iMIM ikhanya khona, kodwa ifuna uyilo lwesixhobo esikrelekrele. Ukubekwa kwepini ye-Ejector kwindawo engenasici kuyinkimbinkimbi kuneplastiki-ungashiya amanqaku abonakalayo okanye ubangele i-deformation kwindawo eluhlaza. Ndikhumbula igiya encinci enamazinyo e-helical apho izikhonkwane ze-ejector kwafuneka zibekwe ebusweni begiya. Saye sagqiba ukusebenzisa isiko, inkqubo ye-multi-stage ejection kunye nokupolisha izikhonkwane ukuya kwisibuko sokugqiba ukukhusela ukumakisha. Ixabiso lesixhobo liye lanyuka, kodwa ixabiso lenxalenye nganye kunye nokusebenza kwakungenakulinganiswa xa kuthelekiswa nayo nayiphi na enye inkqubo.
Enye ingcaciso esebenzayo: ii-engile zedrafti. Ewe, udinga idrafti encinci kuneyesiqhelo yokubumba inaliti yeplastiki, kodwa usafuna enye, ngakumbi kwimingxuma enzulu. Ukuzama ukubaleka kwidrafti ye-zero ukuze ugcine kumatshini wesibini kunokubangela iindawo ezincamathela kwisixhobo okanye ufumane amanqaku ngexesha lokukhutshelwa. Luqoqosho lobuxoki. Injongo ye ukubumba inaliti yensimbi engenasici i-net-shape, kodwa umnatha uthetha ukuba iphuma kwiziko elitshisiweyo elilungele ukusetyenziswa. Rhoqo, kujongano olubalulekileyo, ukukhanya kwe-CNC skim okanye ukomba kusafuneka. Ayikokusilela kweMIM oko; yindlela yepragmatic hybrid. Inkampani efana ne-QSY, enobuchule obuhlangeneyo be-CNC, ibamba le ngqondo ingenamthungo-ibona i-ops yesibini kungekhona njengenkqubo eyahlukileyo kodwa njengesinyathelo sokugqibela kwi-MIM workflow.
ISintering Crucible: Apho uMlingo (kunye nentliziyo) Yenzeka
Yonke into phambi kokuba sintering kukulungiselela nje. Eli linqanaba apho indawo ejiyileyo, emdaka ngebala iba yinxalenye exineneyo, isandi sesinyithi. Kwiintsimbi ezingenasici, ulawulo lwe-atmosphere lubalulekile. Ngokuqhelekileyo usebenzisa i-hydrogen, i-argon, okanye i-vacuum. IHydrojeni igqwesile ekunciphiseni iioksidi zomphezulu kunye nokucoca indawo, kodwa kufuneka ulawule indawo yombethe ngobuchule. Ukuvuza okwazisa isuntswana leoksijini okanye initrogen kunokonakalisa wonke umthwalo weziko.
Ubushushu obufanayo lelinye irhamncwa. Ukuhluka kwe- +/- 10 ° C kwisithando somlilo kunokukhokelela kwi-0.2% umehluko ekunciphiseni. Kwinxalenye ye-50mm, yi-0.1mm-yanele ukukrazula ibhetshi yesicelo sokunyamezela. Sityale imali kwiprofayili yesithando somlilo ngee-thermocouples ezininzi kwaye safumana indawo yethu egqibeleleyo. Ngoku, silayisha iindawo ezibalulekileyo kuphela kuloo ndawo. Iindawo ezingabalulekanga kangako ziya emacaleni. Imalunga nokulawula i-real estate yeziko lakho njenge-chessboard.
Izinga lokupholisa lichaphazela iipropati zokugqibela. Kumabanga okuqina kwemvula efana ne-17-4PH, unokwenza unyango lwesisombululo kunye nokuguga ngokuhambelana nomjikelo we-sintering ukuba i-furnace yakho imiselwe yona. Yinzuzo enkulu, ukuhlanganisa amanyathelo. Kodwa ukufumana ixesha-lobushushu-inguquko yejiko echanekileyo kwinxalenye ethile yobunzima bunamandla. Sakhe ithala leencwadi elincinci leeprofayile eziyimpumelelo kwiintsapho ezahlukeneyo. Asiyoncwadi yesifundo; yilore yomgangatho wevenkile, ebhalwe kwiigrafu ze-thermal kunye neengxelo ze-QC.
Xa iMIM ingeyiyo impendulo
Kangangoko ndikholelwa kwinkqubo, kubalulekile ukwazi imida yayo. Isitofu sesinyithi sokubumba izamana namalungu amakhulu kakhulu (ngokubanzi malunga ne-250 grams ye-stainless) kwaye ibhityile kakhulu, amacandelo abanzi acaba aqhelene ne-warpage. Sakhe sacaphula i-sensor ebhityileyo, efana nepleyiti yezindlu malunga ne-2mm ubukhulu kunye ne-100mm ububanzi. Nokuba kukho izixhobo ezisemthethweni zokupholisa kunye neeseta ze-sintering, asikwazanga ukubamba umcaba. Umxhasi uhambe kunye nesitampu esichanekileyo kunye nomatshini endaweni yoko. Yayingumnxeba ochanekileyo.
Amalungu olwakhiwo akumgangatho ophezulu kakhulu weendlela eziphambili zomthwalo we-aerospace zisasebenza ngcono ngokufoja okanye ukwenziwa ngomatshini kwi-billet. Iimpawu ze-isotropic ze-MIM zilungile, kodwa kwizicelo ezibaluleke kakhulu, umnombo wezinto ezisetyenzisiweyo usakhethwa. Nangona kunjalo, kwizinto ezingenakubalwa kwizixhobo zonyango, imipu, izixhobo zoshishino, kunye ne-elektroniki yabathengi, i-MIM ibonelela ngokudityaniswa okungenakulinganiswa kokuntsonkotha, ukusebenza kwezinto eziphathekayo, kunye nexabiso levolumu. Imalunga nokukhetha amadabi akho.
Yiloo nto amava abanzi omthengisi abalulekile. Ukuba ungena kwivenkile eyenza iMIM kuphela, banokuzama ukunyanzela indawo yakho. Kodwa iqela elikwaziyo ukuphatha utyalo mali kunye noomatshini be-CNC, njengabantu base-QSY, baya kukunika uvavanyo olunyanisekileyo. Banokuthi, Jonga, kule geometry kunye nomthamo, ukubunjwa kweqokobhe kunye nokugqiba kwe-CNC kunokuba neendleko eziphezulu kuwe. Olo sukelo lwakha ukuthembana. Iminyaka yabo engama-30 ekuphoseni nasematshinini kuthetha ukuba babona iMIM njengesixhobo esinye kwibhokisi enkulu yezixhobo, hayi ekuphela kwesixhobo.
I-Real-World Grind: Umgangatho kunye nokuqina
Ukusungula inxalenye yeMIM yinto enye; ukuvelisa i-500,000 kubo nge-CPK ngaphezulu kwe-1.33 yenye. Iitshekhi zezinto ezikrwada ziyimihla ngemihla: ukuhambelana kweqashiso lomgubo, i-binder batch viscosity. Kwinkqubo yokukhangela ubunzima benxalenye eluhlaza kunye nemilinganiselo yokubamba i-drifts ngaphambi kokuba i-sintering. Kodwa i-QC yangempela yenzeka emva kwe-sinter. Senza ulawulo lwenkqubo yeenkcukacha-manani kwimilinganiselo ebalulekileyo, ukujonga ubuninzi (esijolise ngokuqhelekileyo > 96% yethiyori yokungabina stainless), kunye novavanyo olupheleleyo lwe-metallurgy-i-tensile, ukuqina, ukukhangela umhlwa. Ayinakuxoxisana.
Uhlalutyo lokusilela luyinxalenye yomsebenzi. Ndichithe iiyure ndiphantsi kwemakroskopu ndijonge indawo eyaphukileyo. Ngaba yayiyi-pore ene-sintering, ukufakwa kosulelo, okanye ukunyuka koxinzelelo olusuka kwisiphene soyilo? Nganye ineminwe eyahlukileyo. Omnye umba owawusoloko usenzeka kwangethuba yayikukusilela kwindibano. Amalungu aphumelele zonke iinkcukacha. Ekugqibeleni kwalandelelwa kumbandela wokusingatha—abasebenzi babewisa imigqomo enamalungu adityanisiweyo, nto leyo ebangela iintanda eziye zasasazeka. Ulungiso lwalungekho kwinkqubo; ibikukufaka amagwebu emigqomeni. Isifundo: inkqubo ayipheli ezikweni.
Ekugqibeleni, impumelelo ukubumba inaliti yensimbi engenasici imalunga neenkqubo zokucinga. Ngumtshato wesayensi yezinto, uyilo lomatshini, ukwenza izixhobo, ubunjineli bobushushu, kunye nolawulo olungqongqo lobulunga. Asiyombumbulu yomlingo. Yinkqubo enyanzelisayo, enika umdla, kwaye enamandla ngendlela emangalisayo xa uqonda ulwimi lwayo kwaye uhlonipha imithetho yayo. Iinkampani eziqhuba kakuhle kuyo, njengezo zinamava anzulu asisiseko kurhwebo lwentsimbi olunxulumeneyo, zezo ezingathengisi nje iinxalenye ezithile—zithengisa izisombululo ezithembekileyo, ezinobunjineli.
