1. Selelekela: Lintlha tsa Bohloko bakeng sa Alloy Fastener & Bushing Application
Baqapi ba li-valve tsa oli le khase le baenjiniere ba thepa khafetsa ba tobana le ho hloleha ha likarolo pele ho nako ha ba sebelisa li-fasteners tse tloaelehileng tsa tšepe le lihlahla tse tloaelehileng tsa boronse. Ka tlas'a mocheso o phahameng, khase e bolila, le boemo ba mokelikeli o senyang, li-fasteners tse tloaelehileng li na le bothata ba ho lla, ho phatloha ha khatello ea kelello, le tahlehelo ea butle-butle. Lihlahla tse tloaelehileng li tšoara kapa li tsofala ka potlako nakong ea libaesekele tse pheta-phetoang.
Merero e mengata e ipapisitseng le metako e na le mathata a mararo a mantlha:
- Lisebelisoa tse khethehileng tsa alloy li thata ho mochine, tse lebisang ho litekanyetso tse phahameng tsa lihlahisoa le litšenyehelo tse sa lebelloang tsa tlhahiso.
- Mocheso o phahameng oa mocheso o baka phomolo ea bolt esale pele, e ka fellang ka ho lutla ha flange kamora ts'ebeletso ea nako e telele.
- Ho kenya li-alloy tse sa tloaelehang le meralo ea lihlahla ha li na merero e hlakileng e sa jeng, e se nang motheo o tšepahalang oa ho beha tumello ea mocheso o phahameng.
Tataiso ena e akaretsa khetho ea lintho tse bonahalang, machining a likhoele, taolo ea li-creep, moralo oa ho roala mahlahahlaha, le libaka tsa tlhahlobo ea mantsoe a qotsitsoeng. E hahiloe feela bakeng sa likarolo tse tloaelehileng tsa oli le li-valve tsa khase. E sebelise ho qoba liphoso tsa khetho ea thepa, litšila tsa mochini, le ho siuoa ha litšenyehelo ha u batla likarolo tse sa tloaelehang tsa alloy.
2. Mekhahlelo ea Bohlokoa le Meeli ea Litšebeletso (Monel, Inconel, Stellite)
Ho khetha sehlopha se nepahetseng sa alloy ke motheo oa ts'ebeletso e tšepahalang. Tataiso ena e tsepamisitse maikutlo ho limaraka tse tharo tse atisang ho hlalosoa bakeng sa li-valve fasteners, inserts le bushings: Monel 400, Inconel 625/718, le S.motsoako oa cobalt.
2.1 Monel 400 (UNS N04400) - Bolting e Thibelang ho Corrosion bakeng sa Tšebeletso e Bolila e Metsi
- Mocheso o tsoelang pele oa tšebeletsomocheso: Ho fihlela ho 425°C
- Khanyetsano ea mantlha ea litaba: Hydrofluoric acid, metsi a leoatle, brine, le tikoloho ea khase e bolila e bobebe; e hanyetsana haholo le khatello ea maikutlo e petsoha ka metsing a leoatle le a letsoai.
- Tšebeliso e tloaelehileng: Liboutu tsa Monel bakeng sa likhokahano tsa bonane tsa li-valve metsing a leoatle le ts'ebeletso e senyang ea mocheso o tlase.
- Moedi: Ho hanyetsa mocheso o phahameng oa mocheso o phahameng; ha e khothalletsoe bakeng sa tšebeletso ea nako e telele e ka holimo ho 450°C.
2.2 Inconel 625 & Inconel 718 - Li-Fasteners tsa Mocheso o Phahameng oa Anti-Creep
- Inconel 625 (UNS N06625): Ho hanyetsa ka mokhoa o babatsehang ho pitting, crevice corrosion le khase e bolila (NACE MR0175 e lumellana); tšebeletso e tsoelang pele ho fihla ho 650°C. E sebelisoa bakeng sa li-fasteners tse senyang li-valve moo matla a phahameng a sa tsitsang e seng ntho e tlang pele.
- Inconel 718 (UNS N07718): Alloy e thata ea nickel e nang le pula e nang le khanyetso e ikhethang ea creep; e boloka bolt e phahameng esale pele ho fihla ho 650°C (1200°F). Kereiti ena ke khetho ea pele bakeng sa bolting ea li-valve tse nang le khatello e phahameng, mocheso o phahameng (HPHT) moo ho bolokang preload ho leng bohlokoa.
2.3 Stellite Cobalt Alloy - Lisebelisoa le Lihlahla tse sa Hanyeheng
- Mocheso o tsoelang pele oa tšebeletso: Ho fihlela ho 750-800 ° C ntle le tahlehelo e kholo ea boima.
- Molemo oa mantlha: Ho hanyetsa ka tsela e ikhethang ha ho lla, likhohlano tse omeletseng le ho roala ha letlalo esita le ntle le lubrication, e loketseng bakeng sa ho kenya li-valve stem alloy le lihlahla tse sa tloaelehang tsa alloy.
- Sehlopha se tloaelehileng: Setšoantšo sa 6 (cast, HRC 38-44), e sebelisoang haholo bakeng sa matsoho a tataiso ea li-valve le li-anti-wear tse kenyang.
3. Thread Machining Mathata a khethehileng alloy Fasteners
Li-fasteners tse khethehileng tsa alloy ho kenyelletsa le liboutu tsa monel le lithupa tsa Inconel li tsebahala ka thata ho khoasolla. Thepa e tšoanang ea thepa e fanang ka kutu le ho hanyetsa mocheso e baka litšitiso tse kholo tsa mochini.
3.1 Lisosa tse ka sehloohong tsa ho hloleha ha mochini
- Mosebetsi oa serame o matla o thatafatsa: Deformation ea polasetiki ho tloha ho itšeha e etsa hore ho be le lera le thata la holim'a metsi. Ho tlotsa ha bobebe kapa maqeba a sa tebang feela ho bentša letlalo le thatafetseng le ho potlakisa ho roala ha lisebelisoa.
- Boima bo tlase ba mocheso: Hoo e batlang e le mocheso o mong le o mong o lula o tsepamisitsoe moeling oa sesebelisoa ho e-na le ho senya ka har'a chip, e leng se lebisang ho carbide e potlakileng e kenyang ho phunyeha ha mocheso le ho phunyeha ka bohale.
- Matla a phahameng a chesang: Thepa e lula e le thata ebile e le thata esita le ha mocheso o seha, o hlahisa lithapo tse telele, tse likhoele tse etsang mathōko a hahiloeng le ho senya khoele.
- Kotsi ea khoele: Bokhopo bo bobe ba holim'a metsi bo tla etsa hore khoele e tšoaroe nakong ea kopano.
3.2 Litharollo tse sebetsang tsa Thread Machining
- Boemo ba lintho tse bonahalang: Li-fasteners tsa mochini tse maemong a bonolo a tharollo, ebe li etsa ho thatafatsa lilemo ka mor'a ho khoaela ho qoba ho khaola motsoako o thata ka ho feletseng.
- Khetho ea lisebelisoa: Sebelisa li-carbide tse hlabang tse nang le PVD tse nang le li-angles tse ntle tsa rake; qoba lisebelisoa tse lerootho tse hohlang sebakeng sa ho seha.
- Ho khaola litekanyo: Boloka lebelo la bokaholimo bo tlase: 50–100 SFM bakeng sa Monel, le 25–45 SFM feela bakeng sa khoele ea Inconel 718. Boloka phepelo e kholo e lekaneng le botebo ba sehiloeng ho khaola ka botlalo lera le thata-thata, ho e-na le ho nka liphase tse bobebe.
- Mokhoa o khethiloeng oa ho theha: Likhoele tse phuthoang li phahame haholo ho feta likhoele tse sehiloeng bakeng sa li-fasteners tse khethehileng tsa alloy. Ho roala likhoele ho hlahisa phallo e sa khaotseng ea lijo-thollo, ho ntlafatsa boleng ba bokaholimo, 'me ho felisa likotsi tse ngata tse ka bang kotsi.
- Tšireletso ea bokaholimo: Sebelisa lubricant e tiileng ea filimi e omileng (DFL) ho likhoele tse felileng moo ts'ebetso ea anti-galling e hlokahalang.
4. Phahameng-Mocheso Creep & Preload Loss ka Bolted manonyeletso
Ho lutla ha li-valve tse nang le mocheso o phahameng haholo ha ho bakoe ke kutu, empa ho tsoa ho ho thella ha bolt le ho phomola butle butle ka lihora tse telele tsa ts'ebetso.
4.1 Kamoo Creep e Fokotsang Bolt Clamping Force
Creep e hlalosa deformation ea polasetiki e liehang, e sa feleng tlas'a mojaro o sa feleng le mocheso o tsitsitseng, esita le ka tlase ho matla a tlhahiso ea mocheso oa kamoreng. Ha liboutu tsa valve li lula li le tlas'a tsitsipano ka mocheso o phahameng:
- Boutu e otlolla butle-butle, 'me matla a pele a ho koala a theoha butle-butle.
- Thermal cycling e holisa phomolo, qetellong e roba lets'oao le tiisitsoeng la flange.
- Monel 400 e na le ts'ebetso e fokolang ea creep; Inconel 718 ke khetho e sebetsang bakeng sa likopo tsa nako e telele tsa mocheso o phahameng oa mocheso.
4.2 Mehato ea Boenjiniere ea ho Laola Tahlehelo ea Pele
- Ntlafatso ea lintho tse bonahalang: Hlalosa Inconel 718 sebakeng sa Monel bakeng sa litšebeletso tsohle tse tsoelang pele ka holimo ho 500°C.
- Fokotsa khatello ea maikutlo mosebetsing: Fokotsa khatello ea kelello ea bolt ka ho eketsa boholo ba bolt kapa ho theola liperesente tse reriloeng esale pele.
- Ho tiisa mocheso oa mocheso: Tiisa liboutu hape ka mor'a hore kopano e fihlele mocheso o tsitsitseng oa ho sebetsa ho lefella phomolo ea pele ea creep.
- Kalafo e thata ea mocheso: Netefatsa hore li-fasteners li fumana ho thatafala ka lilemo tsohle ho fihlela thepa e tsitsitseng ea mocheso o phahameng oa mocheso.
5. Non-Standard Alloy Insert & Bushing Wear-Resistant Schemes
Kenyelletso e khethehileng ea alloy, bushing e khethehileng ea alloy le likarolo tsa letsoho tsa alloy li sebetsa e le litataiso tsa li-valve le li-liner. Mekhoa e meholo ea ho hloleha ke khohlano e omileng ea likhohlano, ho roala ha likaroloana tse hlabang, le ho ts'oaroa ha mocheso o phahameng ho bakoang ke ho se lekane ha mocheso oa ho atolosoa.
5.1 Litlhophiso tse Tharo tse ka Sehloohong tse sa Hanyeheng
- Sehlahla se tiileng sa Stellite: Sekoahelo se le seng kapa sekontiri se entsoeng ka Stellite 6, se molemo ka ho fetisisa bakeng sa mojaro o boima le sekontiri se ommeng sa valve. Ha ho na bofokoli ba li-welding, ho thata ho tsitsitseng ho pholletsa le karolo eohle.
- Bimetallic bushing e nang le sebopeho sa Stellite: 'Mele oa motheo o entsoeng ka tšepe ea motsoako o nang le Stellite hardfacing holim'a sebaka se ka hare sa ho thella; li-balances apare performance le litšenyehelo tsa thepa e tala bakeng sa lits'ebetso tsa li-valve tsa mosebetsi o mahareng.
- Kenyelletso ea alloy ea nickel e kentsoeng ka graphite: Moralo oa ho itlotsa bakeng sa ts'ebeletso e omileng e sa hlokeng tlhokomelo. Li-plug tse tiileng tsa graphite li hatelloa ka har'a alloy bushing bore ho fokotsa ho kopana ha tšepe le tšepe.
5.2 Tlhokomelo e Bohlokoa ea Mocheso o Phahameng oa Mocheso
Li-alloys tsa stellite le nickel li hola haholo ha li futhumatsoa. Haeba tumello ea kopano e batang e le nyane haholo, bushing e tla tlamella ka thata holim'a kutu ea valve ebe e ts'oara kamora ho phahama ha mocheso.
- Mohatsela o batang o tlameha ho boloka lekhalo le eketsehileng bakeng sa katoloso ea mocheso.
- Bakeng sa lithempereichara tse sebetsang ka holimo ho 500 ° C, keketseho ea "diametral clearance" ea 0.05-0.12 mm e sebelisoa e le sebaka sa ho qala se bapisoang le maemo a tloaelehileng a mocheso oa kamore (e tla netefatsoa khahlanong le li-coefficients tsa alloy thermal extension).
- Qoba ho tobetsa ka thata bakeng sa lisebelisoa tse sa tloaelehang tsa alloy tse tsamaeang tlas'a mocheso oa cyclic.
6. Lintlha tse ka Sehloohong tsa Qotsulo bakeng sa Likarolo tsa Alloy tse sa Tloaelehang tsa Drawing
Boholo ba merero e khethehileng ea alloy fastener le merero ea bushing e qotsitsoe ka kotloloho ho tsoa ho lits'oants'o tsa bareki tsa 2D. Lipehelo tse sieo tsa tekheniki hangata li lebisa litšenyehelong tse sa lebelloang tsa tlhahiso le likhohlano tsa kamora taelo. Ka tlase ke lethathamo le felletseng la tlhahlobo ea ho taka pele u qotsa.
6.1 Litlhoko tsa Setifikeiti sa Lintho le Lintho
- Netefatsa boemo bo nepahetseng ba UNS (Monel 400, Inconel 718, Stellite 6) le lintlha tsa thepa tsa ASTM.
- Netefatsa hore na litlaleho tsa liteko tsa thepa (MTR), tlhahlobo ea mocheso, le ho latela melao ea ts'ebeletso e bolila ea NACE li tlamehile.
- Sheba hore na lintho tse tala li tlameha ho qhibilihisoa ho fokotsa porosity e ka hare bakeng sa likarolo tse phahameng tsa khatello.
6.2 Lintho tsa Litšenyehelo tsa Phekolo ea Mocheso le Mocheso
- Litlhoko tsa khoele: Khoele e pitikolotsoeng vs khoele e sehiloeng; khoele ho nepahala sehlopha; bokaholimo bo bokaalo.
- Phekolo ea mocheso: Ho fokotsa tharollo, ho thatafatsa lilemo, kapa ho imolla khatello ea maikutlo; phekolo ea mocheso e eketsa nako e hlokomelehang ea tlhahiso le litšenyehelo.
- Teko e sa senyeheng (NDT): Tlhahlobo ea likaroloana tsa Magnetic (MPI) kapa tlhahlobo ea ultrasonic (UT) bakeng sa mefokolo ea kahare ho tse kentsoeng le lihlahla tse ferekaneng.
- Ho roala ka holim'a sefahleho: Setlolo se tiileng sa filimi e ommeng holim'a likhoele ho thibela ho ts'oaroa ha kopano.
6.3 Mamello ea Dimensional & Likarolo tse sa Tloaelehang
- Li-diameter tse sa tloaelehang tsa ka ntle / tse ka hare, libopeho tse tloaelehileng tsa flange, li-grooves tsa oli, le masoba a lubrication li eketsa nako ea ho seta ea CNC.
- Litlhoko tsa mamello tse thata haholo li phahamisa litheko, haholo bakeng sa matsoho a masesaane a alloy a tloaetseng ho senyeha ha machining.
- Tšitiso ea khatello ea litaba e tlameha ho hlahlojoa; tšitiso e feteletseng e ka senya li-alloy tse kenngoa nakong ea kopano.
7. Lipotso tse atisang ho botsoa bakeng sa li-alloy fasteners & Bushings
Q1: Na li-bolts tsa Monel li ka nkela li-fasteners tsa Inconel bakeng sa tšebeletso ea valve ka holimo ho 550 ° C?
A: Che. Monel 400 e na le ho phomola ka potlako ka holimo ho 450 ° C. Inconel 718 ea hlokahala ho boloka bolt preload ka mocheso o tsoelang pele o phahameng.
Q2: Na sehlahla sa Stellite se betere joalo ka sekontiri se tiileng kapa se koaheletsoeng ka thata?
A: Lihlahla tse tiileng tsa Stellite li fana ka khanyetso e tsitsitseng ea ho apara ntle le bofokoli ba li-welding. Hardfacing e na le chelete e ngata feela bakeng sa matsoho a nang le boima bo tlaase ba bophara bo boholo.
Q3: Na likhoele tse khethehileng tsa alloy li hloka ho roala ha anti-seize?
A: Ho joalo. Li-alloys tsa nickel le cobalt li na le litšekamelo tse matla tse batang tsa welding. Ho hlokahala hore ho be le lubricant e tiileng ea filimi e ommeng ho thibela khoele e qhomang nakong ea ho tiisa bolt.
Q4: Ke tumello e kae e eketsehileng e lokelang ho bolokeloa lihlahla tsa alloy tse nang le mocheso o phahameng?
A: Tlhokomelo e hlokahalang e itšetlehile ka mocheso o sebetsang le sekhahla sa katoloso ea mocheso oa alloy. Lekhalo la diametral la 0.05–0.12 mm le sebetsa e le sesupo sa pele bakeng sa ts'ebeletso e kaholimo ho 500°C. Boleng bona bo tlameha ho baloa hape bakeng sa alloy ea hau hantle le boemo ba ho sebetsa (ho netefatsoa).
8. Qetello & Mehato e Latelang
Ho khetha li-fasteners tse khethehileng tsa alloy, ho kenya le li-bushings ho hloka ho leka-lekanya ho hanyetsa ha kutu, ho tsitsisa ha mocheso o phahameng oa mocheso, le ts'ebetso ea ho apara. Bakeng sa merero ea ho taka li-valve tsa oli le khase:
- Bapisa boemo ba thepa ka tieo le mocheso oa tšebeletso le mecha ea litaba e senyang; khetha Monel bakeng sa kutu e metsi le Inconel 718 bakeng sa bolting e phahameng ea mocheso.
- Ntlafatsa machining a likhoele ka ho sebelisa lebelo le tlase la ho seha, lisebelisoa tse bohale, le likhoele tse phuthoang ho fokotsa ho thatafala ha mosebetsi o batang.
- Design Stellite alloy bushings e nang le tumello e lekaneng ea katoloso ea mocheso ho qoba ho ts'oaroa ke mocheso o phahameng.
- Hlahloba ka botlalo likarolo tsohle tsa tekheniki mabapi le lits'oants'o tsa bareki pele ho qotso, ho kenyeletsoa kalafo ea mocheso, NDT, mamello e tiileng le kalafo ea bokaholimo.
Haeba u na le metako ea likarolo tsa li-valve tse hlokang tlhahlobo ea thepa, tlhahlobo ea litšenyehelo tsa mochini kapa mantsoe a qotsitsoeng a sa tloaelehang a alloy alloy / bushing custom, fana ka lintlha tsa hau tsa tekheniki bakeng sa tlhahlobo e felletseng ea boenjiniere.
