Noj cov qauv tiag tiag rau PEEK yas txhaj tshuaj
Tso lus
Nyob zoo cov kwv tij,
Niaj hnub no peb xav kom muaj ib qho yooj yim hais ntawm PEEK cov ntaub ntawv.
PEEK polyetheretherketone yog ib qho tshwj xeeb engineering yas nrog cov khoom zoo xws li kub tsis kam, nws tus kheej lubrication, ua haujlwm yooj yim thiab muaj zog txhua yam. Nws tuaj yeem tsim thiab ua tiav rau hauv ntau yam khoom siv kho tshuab, xws li lub zog tsav tsheb, roj cov ntxaij vab tshaus, ua haujlwm pib disk; Aircraft cav qhov chaw, tsis siv neeg tshuab ntxhua khaub ncaws khiav, khoom siv kho mob, thiab lwm yam.
PEEK polyetheretherketone yog ib qho tshwj xeeb engineering yas nrog cov khoom zoo xws li kub tsis kam, nws tus kheej lubrication, ua haujlwm yooj yim thiab muaj zog txhua yam. Nws tuaj yeem tsim thiab ua tiav rau hauv ntau yam khoom siv kho tshuab, xws li lub zog tsav tsheb, roj cov ntxaij vab tshaus, ua haujlwm pib disk; Lub cav cav qhov chaw, tsis siv neeg lub tshuab ntxhua khaub ncaws khiav, cov khoom siv kho mob, thiab lwm yam. Vim yog tus nqi siab ntawm PEEK cov khoom, nws yog ib qho nyuaj rau tsim, thiab nws tau dhau los ua ib qho ntawm ntau qhov chaw txhaj tshuaj molding tuam txhab.
Polyetheretherketone (PEEK) yog ib lub siab polymer tsim los ntawm cov khoom siv rov ua dua uas muaj ib daim ntawv cog lus ketone thiab ob daim ntawv cog lus ether hauv cov qauv saw tseem ceeb, thiab yog cov yas tshwj xeeb engineering. PEEK muaj qhov zoo ntawm cov tshuab ua haujlwm siab, kub kub tsis kam, cuam tshuam tsis kam, nplaim hluav taws kub, acid thiab alkali tsis kam, tawv zoo nkauj, kev pab lub neej ntev, thiab lwm yam, thiab muaj ntau daim ntawv thov hauv kev lag luam tsheb, aerospace, khoom siv kho mob. thiab lwm yam teb.
PEEK resin yog thawj zaug siv nyob rau hauv aerospace teb, hloov txhuas thiab lwm yam ntaub ntawv hlau los tsim ntau yam aircraft qhov chaw. Hauv kev lag luam tsheb, PEEK resin muaj kev sib txhuam zoo thiab cov khoom siv kho tshuab. Raws li cov khoom siv raw rau kev tsim cov cav sab hauv, ntau yam xws li bearings, gaskets, seals, clutch gear rings, etc. ua los ntawm PEEK resin yog siv rau hauv kev sib kis thiab nres tsheb. thiab cov tshuab cua txias tau siv dav.
PEEK resins tuaj yeem tiv taus txog li 3000 lub voj voog ntawm autoclaving ntawm 134 degree, ib qho tshwj xeeb uas ua rau lawv muaj txiaj ntsig zoo hauv kev tsim kom tsis muaj menyuam-tseem ceeb, rov siv tau cov khoom siv phais thiab kho hniav. Lub molding kub ntawm PEEK yog 320 degrees ~ 390 degrees, lub ci kub yog 160 ~ 1855H ~ 8H, thiab pwm kub yog 140 ~ 180. Lub molding kub ntawm cov khoom no yog siab dhau lawm, thiab kev puas tsuaj rau cov ntsia hlau yog loj. Thaum teeb tsa cov ntsia hlau ceev, qhov ceev yuav tsum tsis txhob ceev heev, thiab kev txhaj tshuaj siab yuav tsum yog 100 ~ 130MPa txhaj ceev 40 ~ 80. Tom qab molding, cov ntsia hlau yuav tsum ceev nrooj ntxuav nrog PE wax, thiab cov khoom siv PEEK yuav tsum tsis txhob tso cai nyob rau hauv cov ntsia hlau.
PEEK cov khoom muaj kev ua tau zoo heev hauv ntau yam, thiab nws qhov kev txhaj tshuaj molding tseem muaj qhov kev cia siab zoo. Txawm li cas los xij, PEEK txhaj tshuaj molded qhov chaw kuj muaj ntau yam tsis xws luag, nrog rau cov chaw txias, nyiaj streaks, pores, weld kab, warpage, thiab lwm yam. Tus sau yuav siv sij hawm ib qho kev hloov kho aviation cabin thiab ib puag ncig tswj valve ua piv txwv, thiab tham txog qhov tsis xws luag thiab cov txheej txheem optimization. ntawm PEEK txhaj tshuaj molding txheej txheem.
Hauv qab no yog ib qho piv txwv ntawm kev tsom xam ntawm kev tsim cov khoom tsis xws luag ntawm PEEK.
Daim duab hauv qab no yog PEEK dub nrog rau qhov ntxig valve, txhaj tshuaj molded siv Victrex PEEK 450G. Khoom txoj kab uas hla 110mm, thickness 15mm, nrog M6 × 1 steel inserts.
Nyob rau hauv cov txheej txheem molding ntawm cov khoom no, qhov teeb meem tseem ceeb yog tias cov khoom muaj qhov tsis xws luag, nrog rau cov khoom txias, nyiaj streaks, pores thiab weld marks, thiab lwm yam, thiab muaj cov cim rooj vag nyob rau hauv pem hauv ntej thiab nruab nrab noj. Cov tsos mob tshwm sim tau raug tshuaj xyuas los ntawm tus txiv neej, tshuab, khoom siv, txheej txheem thiab ib puag ncig, thiab cov kev ntsuas coj los siv, thiab tau txais txiaj ntsig zoo. Lub rooj vag cov cim raug tshem tawm los ntawm machining tom qab molding los xyuas kom meej tias pem hauv ntej nto yog tiaj tus thiab lub thickness me me raws li cov qauv tsim.
Cov teeb meem khaub thuas
Muaj ob lub laj thawj tseem ceeb rau qhov teeb meem khoom txias:
Pwm qhov dej txias tsis tau teev tseg lossis tshem tawm thaum lub sijhawm tsim khoom. Lub polymer nyob rau hauv lub molten lub xeev yog coj mus rau hauv kev sib cuag nrog cov pwm nrog ib tug qis kub thaum lub sij hawm tsim khoom, thiab qhov kub ntawm lub hauv ntej nyob rau hauv lub molten lub xeev yuav txo sai heev vim lub tshav kub hloov. Thaum lub melting point ntawm PEEK yog txo mus rau 343 degree C, lub PEEK uas yuav tsum nyob rau hauv lub molten theem nws yuav sai sai solidify thiab ua txias. Hauv cov txheej txheem tsim khoom, yog tias qhov dej txias txias tsis ntxiv rau qhov kawg ntawm tus khiav, cov khoom yuav yooj yim ntws mus rau hauv qhov txias slug, ua rau muaj qhov tsis xws luag hauv kev txhaj tshuaj molded qhov chaw.
PEEK cov khoom muaj txheej txheem tsim khoom tshwj xeeb. Thaum lub thickness ntawm cov khoom yuav tsum tau loj, nws yuav tsum tau txias rau lub sij hawm ntev. Lub sijhawm no, qhov kub ntawm lub nozzle yog siab li 400 degree, tab sis qhov kub thiab txias nyob ib ncig ntawm cov khoom tsis ncav cuag tus nqi no, thiab qhov kub thiab txias sib txawv ua rau cov cua sov sai sai. Yog hais tias lub tes tsho sprue ntawm qhov kub thiab txias yog nyob rau hauv kev sib cuag nrog lub txhaj tshuaj molding tshuab nozzle rau lub sij hawm ntev, tom qab qhov kub thiab txias poob mus rau lub melting point ntawm PEEK, cov khoom molten yog heev yooj yim mus solidify, yog li cuam tshuam nrog kev nce qib ntawm kev txhaj tshuaj molding. txheej txheem. Yog li ntawd, tom qab cov khoom siv txhaj tshuaj thiab siab tuav tiav lawm, lub thoob yuav tsum tau muab tshem tawm tam sim ntawd kom cov pwm thiab lub nozzle ntawm qhov deb (ua ntej pub). Txhawm rau tiv thaiv lub nozzle los ntawm casting, nws yuav tsum tau teem kom zoo twj tso kua nplaum. Lub yaj ncaj qha hu rau huab cua thiab nws yooj yim rau solidification vim qhov kub sib txawv loj. Yog tias qhov kev kho mob tsis muaj, cov khoom khov kho PEEK yuav nkag mus rau hauv pwm, thiab tib lub sijhawm, nws yuav tshwm sim rau ntawm qhov chaw ntawm cov khoom los ntawm kev sib tw, ua rau cov khoom txias tsis xws luag.
Nyiaj streak teeb meem
Rau qee qhov PEEK txhaj tshuaj molded qhov chaw, nyiaj streaks ze ntawm lub rooj vag feem ntau tshwm sim los ntawm ya raws lossis roj. Cov txheej txheem plasticization ntawm cov khoom yuav ua nrog cov roj tsim, uas tuaj yeem ua rau cov nyiaj streaks yooj yim hauv cov khoom. Thaum cov ntsia hlau ceev ntawm lub tshuab txhaj tshuaj molding yog loj, cov pa roj yuav siv sij hawm los nkag rau hauv cov txheej txheem plasticizing, thiab ntws mus rau saum npoo ntawm kev txhaj tshuaj molded ib feem los ntawm cov ciav dej ntws. Vim tias nws ntws los ntawm lub rooj vag nyob rau hauv kev kub siab, nyiaj streaks yuav raug generated nyob rau saum npoo ntawm cov tshuaj molded ib feem. Teem lub siab rov qab thaum lub sij hawm molding tuaj yeem tiv thaiv cov roj nkag los ntawm cov khoom molten thaum lub sij hawm plasticization.
Cov dej noo uas tsim los ntawm cov khoom siv raw uas tsis tau qhuav tag kuj yog cov nyiaj streaks. PEEK cov ntaub ntawv yuav txuas ntxiv nqus dej noo hauv huab cua thaum muab tso, thiab qhov nqus dej tuaj yeem ncav cuag {{0}}.4 feem pua . Cov dej noo absorbed nyob rau hauv qhov ntau lawm nkag mus rau lub rooj vag los ntawm lub yaj. Vim qhov kub kub sib txawv ntawm cov pwm kab noj hniav thiab cov khoom siv molten, qhov kev sib ntsib ntawm ob ua rau nyiaj streaks. Txhawm rau kom tsis txhob muaj qhov tshwm sim ntawm cov nyiaj streaks, kev saib xyuas yuav tsum tau them rau kev tswj cov dej noo nyob rau hauv 0.2 feem pua ntawm cov khoom siv tiag tiag. Thaum khaws cia cov ntaub ntawv, xyuam xim rau muab lawv sib npaug thiab tsis stacking lawv, thiab tswj qhov siab ntawm cov khoom txheej hauv 20-30 hli. Muab PEEK tso rau hauv qhov cub kom qhuav ntawm 150-160 degree rau 6-8 teev ua ntej siv.
Warping teeb meem
Thaum lub shrinkage thiab txias tsis sib xws, cov khoom thiab cov pwm kab noj hniav yuav deviate, thiab warpage yuav tshwm sim nyob rau lub sij hawm no. Qhov tseeb, qhov contraction nws tus kheej yuav tsis muaj kev cuam tshuam ntau, feem ntau yog qhov sib txawv ntawm cov txheej txheem contraction. Nquag, PEEK txhaj tshuaj molded qhov chaw tsuas yog hloov pauv hauv ntim thaum lub shrinkage yog uniform. Thaum lub shrinkage yog uneven, lub warpage ntawm txhaj molded ib feem yuav tshwm sim.
Muaj peb yam tseem ceeb:
(1) Warpage tshwm sim los ntawm qhov tsis sib xws ntawm phab ntsa tuab ntawm kev txhaj tshuaj molded qhov chaw.
(2) Warpage tshwm sim los ntawm cov kaum ntse ntse ntawm kev txhaj tshuaj molded qhov chaw.
(3) Warping deformation tawg los ntawm kev ntxhov siab.
Cov lus qhia rau kev ua kom zoo ntawm PEEK txhaj tshuaj molding txheej txheem
Pwm kub thiab txias tus nqi pom zoo
Hauv kev txhaj tshuaj molding ntawm PEEK, tswj cov pwm kub thiab txias tus nqi tuaj yeem hloov cov khoom siv ntawm cov khoom. Feem ntau, pwm kub rau PEEK molding yuav tsum tau tswj ntawm ib ncig ntawm 175 degree. Thaum cov pwm kub siab tshaj 140 degree, PEEK siv lead ua loj hlob zoo dua, ua tiav ntau dua, thiab cov qauv kuj ruaj khov.
Tsim nyog tus nqi cua txias yog qhov zoo los txhim kho cov khoom siv kho tshuab ntawm cov khoom; qeeb txias thiab txias ceev yuav txo cov khoom siv kho tshuab. Cov duab crystalline ntawm PEEK ntawm qhov kub thiab txias yog qhov tsis sib xws, thiab yog tias siv txoj kev txias qeeb, nws yog ib qho yooj yim los tsim cov muaju uas tsis yog-uniform. Txawm li cas los xij, thaum lub ntsej muag ntawm cov khoom tau txias sai heev, cov cua txias sab hauv tsis nrawm txaus, thiab cov kev ntxhov siab sab hauv tau yooj yim tsim, ua rau cov kab nrib pleb, ua rau txo qis hauv cov khoom siv ntawm cov khoom.
Kev txhaj tshuaj siab xaiv
Thaum siv cov kev txhaj tshuaj siab, cov khoom ntim tau nruj, thiab cov nyhuv molding yuav zoo, uas yog qhov zoo los txhim kho cov khoom siv ntawm PEEK. Txawm li cas los xij, yog tias lub siab siab dhau lawm, cov khoom yuav nyuaj rau demould, ua rau khawb ntawm qhov chaw ntawm cov khoom, yog li txhaj tshuaj.
Lub siab yuav tsum yog nruab nrab. Thaum lub siab txhaj tshuaj yog 9.5 MPa, lub siab tuav lub tog raj kheej yog 7.5 MPa, thiab lub nraub qaum siab yog 0.5-1.5 MPa, cov khoom tuaj yeem tsim tau yooj yim.
kub tswv yim
PEEK yog ib qho tshwj xeeb thermoplastic crystalline yas. Nws cov iav hloov pauv kub yog li 143 degree, thiab nws cov ntsiab lus melting yog li 343 degree. Qhov zoo tshaj plaws ntawm qhov ntsuas kub yog 360-400 degree, nyob rau lub sijhawm no, qhov chaw ntawm cov khoom yog du thiab ci. Lub thermal decomposition kub ntawm PEEK yog 550 degree. Txawm li cas los xij, thaum molding ntawm qhov kub siab (siab dua 410 degree), vim yog kev ua haujlwm ntawm cov tshuab thiab muaj cov pa me me, nws yooj yim rau degrade, thiab kev sib txuas sib txuas tshwm sim. Cov kev cuam tshuam ncaj qha ua rau kev hloov pauv hauv nws cov viscosity yaj, ua rau cov khoom tsis sib xws.
lub sij hawm qhia
Lub sij hawm txhaj tshuaj yuav tsum tau xyuas kom meej tias tag nrho cov pwm kab noj hniav muaj cov khoom molten txaus. Vim lub thickness loj ntawm cov khoom tiav, lub sij hawm txhaj tshuaj yog xaiv los ntawm 6 s. Lub sij hawm tuav lub sij hawm yuav tsum tau xyuas kom meej tias lub ntim ntawm cov khoom yog replenished vim qhov txo ntawm melt kub nyob rau hauv lub pwm kab noj hniav. Nyob rau tib lub sijhawm, txhawm rau zam lub cim ntawm qhov pores tom qab tshem tawm ntawm sprue condensate, lub sijhawm xaiv yog 8 s. Qhov zoo tshaj plaws ntawm lub sij hawm txias yuav tsum yog qhib lub pwm kab noj hniav thaum cov kab noj hniav siab yog nyob ze rau atmospheric siab, thiaj li yuav tsis muaj demoulding khawb ntawm cov tsos ntawm cov khoom. Pwm kab noj hniav siab ntau dua atmospheric siab los yog tsawg dua atmospheric siab qhib lub pwm yuav muaj kev cuam tshuam rau cov tsos ntawm cov khoom. Raws li kev hloov pauv ntawm cov khoom, tom qab kev debugging, nws tau txiav txim siab tias lub sijhawm txias yog 35s.
Tiv tauj peb
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