Li-alloys tsa Titanium li sebelisoa haholo liindastering tse kang boenjineri ba sefofane, likoloi, le biomedical ka lebaka la thepa ea bona e ikhethang, ho kenyelletsa tekanyo e phahameng ea boima ba 'mele, ho hanyetsa kutu, le bokhoni ba ho mamella mocheso o feteletseng. Likarolo tsa alloy tsa titanium tse nang le marako a tšesaane, haholo tse nang le lijeometri tse rarahaneng, li bohlokoa lits'ebetsong tse hlokang lisebelisoa tse bobebe, tse sebetsang hantle, joalo ka li-fuselage tsa sefofane, li-blade tsa turbine le li-implants tsa bongaka. Leha ho le joalo, ts'ebetso ea machining le ts'ebetso ea likarolo tsena hangata e phephetsoa ke ho se tsitse ha dynami, joalo ka ho qoqa le ho sisinyeha, tse hlahang ka lebaka la ho satalla ha tsona le maemo a rarahaneng a ho jara li-multi-axis. Multi-axis dynamic stability domain modelling ke mokhoa oa bohlokoa oa ho bolela esale pele le ho fokotsa ho hloka botsitso hona, ho netefatsa ho nepahala, boleng ba bokaholimo, le bots'epehi ba sebopeho nakong ea tlhahiso le ts'ebeletso.

Sengoliloeng sena se fana ka tlhahlobo e felletseng ea mefuta e mengata ea "multi-axis dynamic stability domain modelling" bakeng sa likarolo tse rarahaneng tsa alloy ea titanium. E kenella ka har'a metheo ea theory, mekhoa ea ho etsa mohlala, netefatso ea liteko, le lits'ebetso tse sebetsang, e hatisa liphephetso tse hlahisoang ke thepa ea thepa, ho rarahana ha geometri, le matla a machining a li-multi-axis. Puisano e hlophisitsoe ho sebetsana le lintlha tsa bohlokoa, ho kenyelletsa le litšoaneleho tsa thepa, mekhoa e matla ea ho etsa mohlala, mekhoa ea ho bolela esale pele ea botsitso, le litlhahlobo tse bapisoang ka litafole tse qaqileng. Sepheo ke ho hlahisa tlhahlobo e matla, ea saense e loketseng bafuputsi, baenjiniere le litsebi tsa saense ea thepa le boenjiniere ba mechine.

Li-alloys tsa Titanium le Lisebelisoa tsa tsona

Thepa ea Titanium Alloys

Li-alloys tsa Titanium li ratoa ka lebaka la motsoako oa tsona o ikhethang oa thepa ea mochini le ea lik'hemik'hale. Li bonts'a karo-karolelano e phahameng ea matla le boima ba 'mele, tse nang le matla a thata a atisang ho feta 1000 MPa ha li ntse li boloka litšepe li le tlase ho 4.5 g/cm³, tse bobebe ho feta tšepe. Ho hanyetsa ha bona ho bakoa ke ho thehoa ha lera le tsitsitseng la titanium oxide, e leng se etsang hore e be se loketseng bakeng sa libaka tse thata, tse kang lisebelisoa tsa leoatleng le moeeng. Ho feta moo, li-alloys tsa titanium li boloka botsitso ba sebopeho maemong a mocheso o phahameng, 'me limaraka tse ling li sebetsa ka ts'epo ho fihla ho 600 ° C.

Li-alloys tse tloaelehileng tsa titanium, joalo ka Ti-6Al-4V (Kereiti ea 5), ​​li laola lits'ebetso tsa indasteri ka lebaka la sebopeho sa tsona se leka-lekaneng sa alpha-beta, se kopanyang matla a mokhahlelo oa alpha oa hexagonal close-packed (HCP) le ductility ea mokhahlelo oa beta oa 'mele-centered cubic (BCC). Li-alloys tse ling, joalo ka Ti-5Al-2.5Sn le Ti-6Al-2Sn-4Zr-2Mo, li etselitsoe lits'ebetso tse ikhethileng tse hlokang ho ntlafatsoa ho cheseha kapa ho hanyetsa ho tsitsa. Ho kenyelletsoa ha likarolo tsa alloying, tse kang aluminium (alpha stabilizer) le vanadium (beta stabilizer), ho lumella taolo e nepahetseng ea thepa ea mochine, empa hape e hlahisa mathata a ho sebetsa ka mechine le boitšoaro bo matla.

Likarolo tse Thin-Walled ho Indasteri

Likarolo tse nang le marako a masesaane, tse hlalosoang e le meaho e nang le karo-karolelano ea botenya ho isa ho bolelele ka tloaelo e ka tlase ho 1:10, e atile boenjiniere ba sefofane, moo ho fokotsa boima ba 'mele ho leng bohlokoa haholo. Mehlala e kenyelletsa matlalo a sefofane, li-blade tsa turbine, le liphanele tsa sebopeho sa sathelaete. Likaroloana tsena hangata li na le lijeometri tse rarahaneng, joalo ka bokaholimo bo kobehileng, botenya bo fapaneng, le li-cutouts tse rarahaneng, tse thatafatsang tlhahiso ea tsona le botsitso ba ts'ebetso. Ho satalla ho tlase ha meaho e nang le marako a masesaane ho etsa hore ho be bonolo ho fetoha le ho thothomela tlas'a matla a ho itšeha kapa meroalo e matla, e lebisang ho mathata a ho boloka ho nepahala ha sebopeho le boleng ba bokaholimo.

Lits'ebetsong tsa biomedical, likaroloana tse tšesaane tse nang le lebota la titanium alloy li sebelisoa ho li-implants, joalo ka lithupa tsa letheka le meno. lihlopha, moo biocompatibility le moralo o bobebe li leng bohlokoa. Indasteri ea likoloi e boetse e sebelisa likarolo tsena likoloing tse sebetsang hantle bakeng sa likarolo tse kang litsamaiso tsa mosi oa metsi le liliba tse emisitsoeng, tse matlafatsang ho tšoarella ha titanium le ho hanyetsa kutu.

Mathata ho Multi-Axis Machining

Multi-axis machining, hangata e kenyelletsang lilepe tse tharo ho isa ho tse hlano, e sebelisoa ho etsa likarolo tse rarahaneng tsa titanium alloy alloy. Ts'ebetso ena e etsa hore ho be le taolo e nepahetseng holim'a sebopeho sa lisebelisoa le boemo ba mosebetsi, e lumellang ho theoa ha li-geometri tse rarahaneng. Leha ho le joalo, tšebelisano e matla lipakeng tsa sesebelisoa sa ho itšeha, sesebelisoa sa mosebetsi le sesebelisoa sa mochini e hlahisa mathata a bohlokoa. Ho satalla ho tlase ha meaho e nang le marako a masesaane ho lebisa moqoqong o nchafatsang, ho sisinyeha ho ithabisang ho senyang bokaholimo le bophelo ba lisebelisoa. Ntle le moo, litšoaneleho tse matla tsa li-alloys tsa titanium, tse susumetsoang ke ho tlosoa ha thepa le ho fokotsa ts'ebetso, li thatafatsa likhakanyo tsa botsitso.

Multi-axis dynamic stability domain modelling e rarolla mathata ana ka ho etsa 'mapa oa maemo a tsitsitseng a ts'ebetso (mohlala, lebelo la spindle, botebo ba sehiloeng) sebakeng se nang le likarolo tse ngata tsa parameter. Mokhoa ona o ikarabella bakeng sa matla a kopantsoeng a sesebelisoa, sesebediswa sa mosebetsi le mochini, ho nahanoa ka lintlha tse joalo ka geometry ea sesebelisoa, likarolo tsa ho seha le thepa ea thepa.

Metheo ea Theory of Dynamic Stability Modeling

Lintho tsa motheo tsa Machining Dynamics

Machining dynamics e kenyelletsa ho ithuta ka litšebelisano tse matla pakeng tsa sesebelisoa sa ho itšeha le mosebetsi nakong ea ho tlosoa ha thepa. Bakeng sa likaroloana tse tšesaane tsa titanium alloy, litšebelisano tsena li laoloa ke lintlha tse latelang tsa bohlokoa:

• Puisano e Tsosolosang: Sena se etsahala ha sesebelisoa sa ho itšeha se thothomela, se siea sebaka sa wavy se sebetsanang le lisebelisoa tse latelang tsa lisebelisoa, ho matlafatsa ho thothomela. Ketsahalo ena e etsoa ho sebelisoa li-equation tsa delay differential equations (DDEs), tse ikarabellang bakeng sa tieho ea nako lipakeng tsa ho feta ha lisebelisoa tse latellanang.

• Ts'ebetso ea Damping: Ka lebelo le tlase la li-spindle, litšebelisano tse sa lumellaneng pakeng tsa sefahleho sa lepheko la sesebelisoa le sesebelisoa sa mosebetsi li hlahisa damping, ho tsitsisa ts'ebetso. Sena ke sa bohlokoa ka ho khetheha bakeng sa li-alloys tsa titanium, tse entsoeng ka mochine ka lebelo le tlaase ka lebaka la mocheso o tlaase oa mocheso le lik'hemik'hale tse phahameng tsa lik'hemik'hale.

• Dynamics tsa Mekhoa e Mengata+ Mekhoa ena e tsamaisana le matla a sesebelisoa, a hlokang mefuta e mengata ea tokoloho (MDOF).

• Litieho tse ngata: Li-angles tse sa tšoaneng tsa sekontiri kapa li-helix ho milling ea li-multi-axis li hlahisa tieho ea nako e ngata, e leng ho thatafatsa likhakanyo tsa botsitso.

Li-equations tse laolang bakeng sa machining dynamics hangata li hlalosoa ka tsela e latelang:

[ M \ddot{x}(t) + C \dot{x}(t) + K x(t) = F_c(t - \tau) ]

moo (M), (C), le (K) li emelang matrices a boima, a damping le a sataletseng, ka ho latellana; (x(t)) ke vector ea phalliso; (F_c(t - \tau)) ke matla a sehang ka tieho ea nako (\tau); mme (\dot{x}(t)) le (\ddot{x}(t)) e bolela lebelo le lebelo.

Lits'oants'o tsa Lobe tsa botsitso

Lits'oants'o tsa "stability lobe diagrams" (SLDs) ke lejoe la sekhutlo la mohlala o tsitsitseng oa botsitso, 'mapa oa libaka tse tsitsitseng le tse sa tsitsang sebakeng sa paramethara sa lebelo la spindle le botebo ba axial ba sehiloeng. Bakeng sa likarolo tse nang le marako a tšesaane, li-SLD li na le likarolo tse tharo, tse kenyelletsang phello ea ho tlosoa ha thepa ka litšobotsi tse matla. Lits'oants'o li nkuoa ka ho rarolla sebopeho sa equation ea dynamic system:

[ \det[I - G(\omega) A(\omega)] = 0 ]

moo (G(\omega)) e leng mosebetsi oa karabelo ea maqhubu (FRF) ea sistimi, mme (A(\omega)) ke matrix a matla a ho itšeha a tataisoang. Tharollo e fana ka botebo ba bohlokoa ba ho khaola, ka tlase moo ts'ebetso e lulang e tsitsitse.

Bakeng sa ho sila ka li-axis tse ngata, li-SLD li tlameha ho ikarabella bakeng sa mekhoa e fapaneng ea lisebelisoa le li-geometri tsa mosebetsi, tse lebisang ho litšobotsi tse matla tse itšetlehileng ka maemo. Mokhoa o tlaase ka ho fetisisa oa enfelopo (LEM) o atisa ho sebelisoa ho bolela esale pele botsitso ba ho qetela ka ho nahana ka mokhoa o bonolo ka ho fetisisa sebakeng se seng le se seng sa ho sila.

Ts'ebetso ea Damping le Liphello tsa ho Tlosa Lintho

Ts'ebetso ea damping e hlaha ka lebaka la ho sebelisana pakeng tsa sefahleho sa lehlakoreng la sesebelisoa le bokaholimo ba mosebetsi, haholo-holo ka lebelo le tlase la spindle. Coefficient ea ho lema, e nkiloeng ho molao-motheo oa ho leka-lekanya matla le "frequency-domain decomposition" (FDD) ea lipontšo tsa vibrate, e lekanya phello ena. Bakeng sa li-alloys tsa titanium, mocheso o tlase oa mocheso o lebisa ho bokellaneng ha mocheso, ho fetola coefficient ea damping nakong ea machining.

Ho tlosoa ha thepa ho ama haholo litšoaneleho tse matla tsa likarolo tse tšesaane tse nang le marako. Ha thepa e tlosoa, maqhubu a tlhaho a workpiece a eketseha, ha ho satalla ha eona le karo-karolelano ea damping e fokotseha, e fokotsa ho hanyetsa ho sisinyeha. Sena se hloka ntlafatso e matla ea sistimi ea FRF mefuteng ea botsitso, hangata e fihlellehang ka mekhoa ea ntlafatso e matla.

Mekhoa ea ho Etsa Mohlala bakeng sa Multi-Axis Dynamic Stability

Mekhoa ea Marang-rang-Domain

Mekhoa ea sebaka sa maqhubu, joalo ka e hlahisitsoeng ke Budak le Altintas, e rarolla bothata ba botsitso ka ho sekaseka FRF ea sistimi. Tharollo ea maqhubu a mangata e etsa hore ho be le phapang ea nako le nako ea matla a ho khaola ho li-multi-axis milling, ho nahanela likarolo tse peli tse tloaelehileng le tse feto-fetohang. Mokhoa ona o sebetsa ka mokhoa o sebetsang hantle bakeng sa litsamaiso tsa mofuta o le mong empa o fetoha o rarahaneng bakeng sa litsamaiso tsa mefuta e mengata ka lebaka la ho kopanngoa ha maqhubu a mangata.

Moetso o akaretsang oa "frequency-domain" oa titanium alloy milling o kenyelletsa mokhoa oa ho fokotsa, mekhoa e mengata, le litiehiso tse ngata, tse hlahisoang joalo ka:

[ G(\omega) = \sum_{i=1}^N \frac{\phi_i \phi_i^T}{\omega_i^2 - \omega^2 + 2 \zeta_i \omega_i \omega j} ]

moo (\phi_i), (\omega_i), le (\zeta_i) ke sebopeho sa mokhoa, maqhubu a tlhaho, le karo-karolelano ea damping ea (i)-th mode, ka ho latellana, le (N) ke palo ea mekhoa e nkiloeng.

Mekhoa ea Nako-Domain

Mekhoa ea nako-domain e etsisa karabelo e matla ea tsamaiso ea mechine ka ho kopanya li-DDE ka lipalo. Mokhoa o felletseng oa discretization, mohlala, o khetholla nako ea ho lieha le ho rarolla sistimi khafetsa, e fana ka ho nepahala ho phahameng bakeng sa litsamaiso tse rarahaneng tse nang le tieho le mekhoa e mengata. Mokhoa o thehiloeng ho quadrature oa Gaussian o holisa mokhoa ona ka ho ntlafatsa ts'ebetso ea khomphutha ka ho kopanya lipalo tse ntlafalitsoeng.

Mekhoa ea nako-domain e loketse ka ho khetheha bakeng sa likarolo tse tšesaane tse nang le marako, moo mekhahlelo e matla e fapaneng le ho tlosoa ha thepa. Mohlala oa Kriging surrogate, o kopantsoeng le lipapiso tse lekanyelitsoeng, o ka bolela esale pele kamano pakeng tsa boemo ba milling le liparamente tse matla, e leng se nolofalletsang likhakanyo tse nepahetseng tsa botsitso.

Mehlala e tsamaisoang ke data le Hybrid

Mekhoa e tsamaisoang ke data, joalo ka tlhahlobo ea grey relational (GRA) le ho ithuta ka mochini, li ntse li sebelisoa haholo ho etsa mohlala oa boits'oaro bo matla bo matla. Mekhoa ena e hlahloba lintlha tsa liteko ho fumana likamano pakeng tsa likarolo tsa microstructural, mekhoa ea ho itšeha, le liphello tsa botsitso. Mohlala, GRA e sebelisitsoe mekhoeng e meholo ea alloy ea titanium ho etsa 'mapa oa likamano tsa thepa ea microstructure tlas'a phallo e matla.

Mefuta ea Hybrid e kopanya mefuta e thehiloeng ho fisiks le mekhoa e tsamaisoang ke data. Ka mohlala, mohlala oa lebasetere o kopanyang ts'ebetso ea tahlehelo e thehiloeng ho fisiks e nang le mekhoa e mengata ea ho fetola mekhoa e mengata e itšetlehileng ka mekhoa ea tlhokomelo e bontšitse ts'ebetso e phahameng ea ho bolela esale pele bakeng sa ho siloa ha likaroloana tse tšesaane. Mefuta ena e sebelisa lintlha tsa ts'ebetso ho ntlafatsa kakaretso le ho nepahala.

Netefatso ea Teko le Lithuto tsa Taba

Tlhophiso ea Teko ea Titanium Alloy Milling

Lithuto tsa liteko mabapi le ho siloa ha li-multi-axis tsa likaroloana tse tšesaane tsa titanium alloy hangata li kenyelletsa litsi tsa machining tsa li-axis tse tharo kapa tse hlano, joalo ka VDL-1000E by Dalian Machine Tool. Lisebelisoa tse tiileng tsa ho seha li-carbide tse nang le liphahlo tsa TiAlN li sebelisoa hangata, ka bophara ho tloha ho 8 ho isa ho 12 mm le li-angles tsa helix tsa 30 ° -45 °. Li-workpieces hangata ke lipoleiti tse khutlonnetsepa (mohlala, 200 × 200 × 5 mm) tse tsitsitseng holim'a li-vises, tse nang le maemo a tlaase a ho sila le ho omisa ho fokotsa liphello tsa mocheso.

Lipontšo tsa vibration li lekanyetsoa ka li-accelerometers le ho hlahlojoa ka FDD ho ntša li-parameter tsa modal le ho sebetsana le li-coefficients tse fokolang. Matla a ho itšeha a hlahlojoa ho sebelisoa li-dynamometers, 'me boleng ba bokaholimo bo hlahlojoa ka profilometry. Liteko li etsoa ho pholletsa le lebelo la spindle (500-5000 rpm) le botebo ba axial ba sehiloeng (0.5-5 mm) ho haha ​​​​li-SLD tse matla.

Thuto-pale: Ho Tlisoa ha Aerospace Thin-Walled Parts

Boithuto ba boemeli bo kenyelletsa ho siloa ka lebelo le phahameng ha mochini oa alloy oa titanium alloy e bopehileng joaloka I. Ba sebelisa software ea Visual C ++, bafuputsi ba ile ba bala sebaka sa botsitso ba puisano, ba khetholla meeli ea bohlokoa bakeng sa ho itšeha ho tsitsitseng. Liphetho li bontšitse hore machining a tsitsitseng a ka finyelloa ka lebelo le phahameng la spindle (ka holimo ho 3000 rpm) ka botebo ba axial ka tlase ho 2 mm. Ho netefatsoa ha liteko ho netefalitse keketseho ea 15% ea sekhahla sa ho tlosoa ha thepa ntle le moqoqo, ho ntlafatsa boleng ba bokaholimo ka 20% ha bo bapisoa le maemo a sa tsitsang.

Thuto-pale: Biomedical Implant Fabrication

Ha ho etsoa li-implants tsa meno a titanium alloy, ho roala li-multi-axis ho sebelisoa ho finyella li-geometri tse rarahaneng ka ho nepahala ho phahameng. Boithuto bo mabapi le li-implants tsa Ti-6Al-7Nb bo bonts'itse hore ho kenyelletsa ho senyeha ha mekhoa mekhoeng ea botsitso ho fokolitse mefokolo e bakiloeng ke moqoqo ka 30%. Tšebeliso ea mohlala o thehiloeng ho Kriging ho bolela esale pele maemo a matla libakeng tse fapaneng tsa ho sila e ile ea ntlafatsa ho nepahala le ho feta, e leng ho nolofalletsang phokotso ea 10% ea nako ea ho sebetsa.

Tlhahlobo ea Papiso le Litafole

Letlapa la 1: Papiso ea Mekhoa ea Boipheliso ba Botsitso

Tafole e latelang e bapisa mekhoa ea bohlokoa ea ho bolela esale pele ea botsitso bakeng sa ho sila ka li-axis tse ngata tsa likarolo tse tšesaane tsa titanium alloy, ho totobatsa matla a bona, mefokolo le lits'ebetso.

Polelo e Hatisitsoeng: Haeba ho se na litaelo tse ikhethang, lingoloa tsohle tse fumanehang sebakeng sena sa marang-rang ke tsa mantlha. Ka kopo bonts'a mohloli oa khatiso: https: //www.cncmachiningptj.com/ li -ththanks！

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