Raws li cov teb chaws thoob plaws ntiaj teb muab qhov tseem ceeb rau kev txuag hluav taws xob thiab txo qis emissions, kev txhim kho cov hluav taws xob ntshiab tshiab lub zog tsheb tau dhau los ua ib qho qauv. Ntxiv nrog rau kev ua haujlwm ntawm roj teeb, qhov zoo ntawm lub cev kuj yog ib qho tseem ceeb rau kev tsav tsheb ntawm lub zog tshiab. Txhawb txoj kev loj hlob ntawm lub teeb yuag tsheb lub cev qauv thiab kev sib txuas zoo tuaj yeem txhim kho kev tsav tsheb ntau yam ntawm lub tsheb hluav taws xob los ntawm kev txo qhov hnyav ntawm tag nrho lub tsheb kom ntau li ntau tau thaum ua kom lub zog thiab kev nyab xeeb ntawm lub tsheb. Nyob rau hauv cov nqe lus ntawm lub teeb yuag ntawm lub tsheb, lub steel-aluminium hybrid lub cev yuav siv sij hawm mus rau hauv tus account ob lub zog thiab hnyav txo ntawm lub cev, dhau los ua ib qho tseem ceeb txhais tau tias kom ua tiav lub teeb yuag ntawm lub cev.
Txoj kev sib txuas ib txwm siv rau kev sib txuas ntawm aluminium alloys muaj kev sib txuas tsis zoo thiab tsis muaj kev ntseeg siab. Self-piercing riveting, raws li kev sib txuas tshiab thev naus laus zis, tau siv dav hauv kev lag luam tsheb thiab kev lag luam aerospace vim nws qhov txiaj ntsig zoo hauv kev sib txuas lub teeb alloys thiab cov ntaub ntawv sib xyaw. Nyob rau hauv xyoo tas los no, Tuam Tshoj cov kws tshawb fawb hauv tsev tau ua cov kev tshawb fawb txog kev tho tus kheej riveting thev naus laus zis thiab kawm txog cov txiaj ntsig ntawm kev kho cua sov sib txawv ntawm kev ua haujlwm ntawm TA1 kev lag luam ntshiab titanium tus kheej piercing riveted pob qij txha. Nws tau pom tias annealing thiab quenching kev kho cua sov txoj kev txhim kho lub zog zoo li qub ntawm TA1 muaj cov ntshiab titanium tus kheej-piercing riveted pob qij txha. Cov txheej txheem sib koom ua ke tau pom thiab txheeb xyuas los ntawm qhov kev xav ntawm cov khoom ntws, thiab kev sib koom ua ke tau raug soj ntsuam raws li qhov no. Los ntawm kev ntsuam xyuas metallographic, nws tau pom tias thaj chaw loj ntawm cov yas deformation tau ua kom zoo rau hauv cov qauv fiber ntau nrog ib qho kev nyiam, uas txhawb kev txhim kho cov txiaj ntsig kev ntxhov siab thiab qaug zog ntawm kev sib koom tes.
Cov kev tshawb fawb saum toj no feem ntau tsom rau cov khoom siv kho tshuab ntawm cov pob qij txha tom qab riveting ntawm aluminium alloy daim hlau. Nyob rau hauv qhov tseeb riveting zus tau tej cov tsheb lub cev, cov kab nrib pleb ntawm lub riveted pob qij txha ntawm aluminium alloy extruded profiles, tshwj xeeb tshaj yog high-zog aluminium alloys nrog siab alloying ntsiab ntsiab lus, xws li 6082 aluminium alloy, yog cov tseem ceeb yam tseem ceeb txwv tsis pub siv cov txheej txheem no ntawm lub tsheb lub cev. Nyob rau tib lub sijhawm, cov duab thiab txoj hauj lwm tolerances ntawm extruded profiles siv nyob rau hauv lub tsheb lub cev, xws li bending thiab twisting, ncaj qha cuam tshuam rau kev sib dhos thiab siv cov profiles, thiab kuj txiav txim seb qhov luaj li cas ntawm lub tsheb tom ntej lub cev. Txhawm rau tswj kev khoov thiab sib tw ntawm cov profiles thiab xyuas kom meej qhov tseeb ntawm cov profiles, ntxiv rau cov qauv tuag, qhov hluav taws xob kub ntawm cov profiles thiab cov quenching ceev hauv online yog qhov tseem ceeb tshaj plaws cuam tshuam. Qhov siab dua qhov hluav taws xob qhov hluav taws xob thiab qhov nrawm dua qhov quenching, qhov ntau dua qhov khoov thiab sib tw ntawm cov profiles. Rau aluminium alloy profiles rau lub cev tsheb, nws yog ib qho tsim nyog los xyuas kom meej qhov tseeb qhov tseeb ntawm cov profiles thiab xyuas kom meej tias cov alloy riveting tsis tawg. Txoj kev yooj yim tshaj plaws los txhim kho qhov tseeb qhov tseeb thiab riveting cracking kev ua tau zoo ntawm cov hlau yog tswj kev tawg los ntawm kev ua kom cov cua sov thiab cov txheej txheem kev laus ntawm cov pas nrig extruded thaum khaws cov khoom sib xyaw, cov qauv tuag, extrusion ceev, thiab quenching ceev tsis hloov. Rau 6082 txhuas alloy, nyob rau hauv lub premise tias lwm cov txheej txheem tej yam kev mob tseem tsis hloov, qhov siab dua qhov extrusion kub, qhov ntiav cov coarse-grained txheej, tab sis ntau dua deformation ntawm profile tom qab quenching.
Daim ntawv no siv 6082 aluminium alloy nrog tib lub ntsiab lus raws li cov khoom siv tshawb fawb, siv qhov sib txawv extrusion kub thiab cov txheej txheem kev laus sib txawv los npaj cov qauv hauv ntau lub xeev, thiab ntsuas qhov cuam tshuam ntawm extrusion kub thiab kev laus lub xeev ntawm kev xeem riveting los ntawm kev ntsuam xyuas riveting. Raws li cov txiaj ntsig ua ntej, cov txheej txheem kev laus zoo tau txiav txim siab ntxiv los muab kev taw qhia rau kev tsim khoom tom ntej ntawm 6082 aluminium alloy lub cev extrusion profiles.
1 Cov ntaub ntawv sim thiab cov txheej txheem
Raws li pom nyob rau hauv Table 1, lub 6082 aluminium alloy tau yaj thiab npaj rau hauv ib puag ncig ingot los ntawm ib nrab-nruam casting. Tom qab ntawd, tom qab homogenization kev kho cua sov, lub ingot tau rhuab mus rau qhov sib txawv kub thiab extruded rau hauv ib tug profile ntawm 2200 t extruder. Qhov profile phab ntsa thickness yog 2.5 hli, extrusion chim kub yog 440 ± 10 ℃, lub extrusion tuag kub yog 470 ± 10 ℃, lub extrusion ceev yog 2.3 ± 0.2 mm / s, thiab cov profile quenching txoj kev muaj zog cua txias. Raws li qhov ntsuas kub, cov qauv ntsuas tau suav nrog 1 txog 3, cov qauv 1 muaj qhov ntsuas kub qis tshaj plaws, thiab qhov sib thooj ntawm qhov ntsuas kub yog 470 ± 5 ℃, qhov ntsuas kub ntawm cov qauv 2 yog 485 ± 5 ℃, thiab qhov ntsuas kub ntawm cov qauv 3 yog qhov siab tshaj plaws, thiab qhov sib thooj 50 ± 5 ℃
Table 1 Kev ntsuas tshuaj muaj pes tsawg leeg ntawm kev sim alloy (ntau feem /%)
Nyob rau hauv cov xwm txheej uas lwm cov txheej txheem tsis xws li cov khoom muaj pes tsawg leeg, cov qauv tuag, extrusion ceev, quenching ceev tseem tsis hloov, cov saum toj no No. Tom qab cov rwb thaiv tsev, lawv yog cua-txias, thiab tom qab ntawd riveted los soj ntsuam qhov cuam tshuam ntawm qhov sib txawv extrusion kub thiab aging xeev ntawm qhov kev xeem riveting. Kev ntsuas riveting siv 2.5 hli tuab 6082 alloy nrog qhov sib txawv extrusion kub thiab sib txawv kev laus raws li cov phaj hauv qab, thiab 1.4 hli tuab 5754-O alloy ua lub phaj sab sauv rau SPR riveting xeem. Lub riveting tuag yog M260238, thiab rivet yog C5.3 × 6.0 H0. Tsis tas li ntawd, txhawm rau txhawm rau txiav txim siab qhov kev laus zoo tshaj plaws, raws li kev cuam tshuam ntawm extrusion kub thiab kev laus lub xeev ntawm riveting cracking, lub phaj ntawm qhov zoo tshaj plaws extrusion kub yog xaiv, thiab ces kho nrog txawv kub thiab txawv lub sij hawm aging los kawm txog cov aging system ntawm riveting cracking, thiaj li mus thaum kawg paub meej tias qhov zoo tshaj plaws aging system. Lub tshuab ntsuas hluav taws xob siab tau siv los saib xyuas cov khoom siv ntawm cov khoom siv ntawm qhov sib txawv ntawm qhov kub thiab txias, MTS-SANS CMT5000 series microcomputer-tswj hluav taws xob universal kuaj tshuab tau siv los ntsuas cov khoom siv hluav taws xob, thiab lub tshuab hluav taws xob qis tau siv los soj ntsuam cov pob qij txha tom qab riveting hauv ntau lub xeev.
2 Kev sim cov txiaj ntsig thiab kev sib tham
2.1 Cov nyhuv ntawm extrusion kub thiab laus lub xeev ntawm riveting cracking
Sampling tau coj raws li ntu ntu ntawm extruded profile. Tom qab kev sib tsoo ntxhib, kev sib tsoo zoo thiab polishing nrog cov ntawv xuab zeb, cov qauv tau corroded nrog 10% NaOH rau 8 feeb, thiab cov khoom siv corrosion dub tau ntxuav nrog nitric acid. Cov coarse grain txheej ntawm cov qauv tau pom nrog lub tshuab hluav taws xob siab, uas nyob rau ntawm qhov chaw sab nraum lub rivet buckle ntawm qhov npaj riveting txoj hauj lwm, raws li pom nyob rau hauv daim duab 1. Qhov nruab nrab coarse grain txheej qhov tob ntawm tus qauv No. 1 yog 352 μm, qhov nruab nrab coarse grain txheej qhov tob ntawm cov qauv No. 2 yog 135 mse thiab nruab nrab coarse grain txheej. ua 31m. Qhov sib txawv ntawm qhov tob ntawm cov coarse grain txheej yog feem ntau yog vim qhov sib txawv extrusion kub. Qhov siab dua qhov extrusion kub, qhov qis deformation tsis kam ntawm 6082 alloy, qhov me dua qhov deformation zog cia tsim los ntawm kev sib txhuam ntawm cov hlau thiab cov extrusion tuag (tshwj xeeb tshaj yog txoj siv sia ua haujlwm tuag), thiab qhov me me ntawm recrystallization tsav tsheb. Yog li ntawd, lub npoo coarse grain txheej yog ntiav; qhov qis extrusion kub, qhov ntau dua qhov deformation tsis kam, ntau dua qhov deformation zog cia, nws yooj yim dua rau recrystallize, thiab qhov tob ntawm coarse grain txheej. Rau 6082 alloy, cov txheej txheem ntawm coarse grain recrystallization yog theem nrab recrystallization.
(a) Qauv 1
(b) Qauv 2
(c) Qauv 3
Daim duab 1 Thickness ntawm coarse grain txheej ntawm extruded profiles los ntawm cov txheej txheem sib txawv
Cov qauv 1 mus rau 3 npaj ntawm qhov sib txawv extrusion kub tau muaj hnub nyoog ntawm 180 ℃ / 6 h thiab 190 ℃ / 6 h, feem. Cov khoom siv tshuab ntawm cov qauv 2 tom qab ob txoj kev laus muaj nyob rau hauv Table 2. Nyob rau hauv ob txoj kev laus, lub zog tawm los thiab tensile lub zog ntawm cov qauv ntawm 180 ℃ / 6 h yog qhov siab dua li ntawm 190 ℃ / 6 h, thaum lub elongation ntawm ob tsis sib txawv, qhia tias 190 ℃ / 6 h kev kho mob. Txij li cov khoom siv kho tshuab ntawm 6 series aluminium alloy fluctuate zoo heev nrog kev hloov pauv ntawm cov txheej txheem kev laus hauv lub xeev tsis muaj hnub nyoog, nws tsis tsim nyog rau kev ruaj ntseg ntawm cov txheej txheem ntau lawm thiab kev tswj ntawm riveting zoo. Yog li ntawd, nws tsis tsim nyog siv lub xeev qis dua los tsim lub cev profile.
Table 2 Mechanical properties of sample No. 2 nyob rau hauv ob txoj kev laus
Cov tsos ntawm cov khoom kuaj tom qab riveting yog pom nyob rau hauv daim duab 2. Thaum tus qauv No. 1 nrog ib tug sib sib zog nqus coarse-grained txheej yog riveted nyob rau hauv lub ncov laus lub xeev, hauv qab nto ntawm lub rivet muaj pom tseeb txiv kab ntxwv tev thiab tawg pom ntawm qhov muag liab qab, raws li qhia nyob rau hauv daim duab 2a. Vim tias qhov kev taw qhia tsis sib xws hauv cov nplej, qhov deformation degree yuav tsis sib npaug thaum lub sij hawm deformation, tsim ib qho tsis sib xws. Thaum cov nplej yog ntxhib, qhov tsis sib xws ntawm qhov chaw yuav loj dua, ua rau cov txiv kab ntxwv tev tshwm sim pom ntawm qhov muag liab qab. Thaum tus qauv No. 3 nrog ib tug ntiav coarse-grained txheej npaj los ntawm kev ua kom lub extrusion kub yog riveted nyob rau hauv lub ncov laus lub xeev, lub hauv qab nto ntawm lub rivet yog tus du, thiab lub cracking yog suppressed rau ib yam dab tsi, uas tsuas yog pom nyob rau hauv lub microscope magnification, raws li qhia nyob rau hauv daim duab 2b. Thaum tus qauv No.3 nyob rau hauv lub xeev dhau-laus, tsis muaj qhov tawg tau pom nyob rau hauv lub tshuab tsom iav, raws li pom hauv daim duab 2c.
(a) Cov kab nrib pleb pom ntawm qhov muag liab qab
(b) Cov kab nrib pleb me me pom nyob hauv lub tshuab tsom
(c) Tsis muaj kab nrib pleb
Daim duab 2 Sib txawv ntawm kev tawg tom qab riveting
Qhov saum npoo tom qab riveting feem ntau yog nyob rau hauv peb lub xeev, xws li, cov kab nrib pleb pom ntawm qhov muag liab qab (cim “×”), me ntsis kab nrib pleb pom nyob rau hauv lub tshuab tsom iav (cim “△”), thiab tsis muaj kab nrib pleb (cim “○”). Cov txiaj ntsig ntawm riveting morphology ntawm peb lub xeev cov qauv saum toj no nyob rau hauv ob txoj kev laus yog qhia nyob rau hauv Table 3. Nws tuaj yeem pom tau tias thaum cov txheej txheem kev laus tsis tu ncua, cov riveting cracking kev ua tau zoo ntawm cov qauv nrog siab extrusion kub thiab thinner coarse grain txheej yog zoo dua li ntawm cov qauv nrog sib sib zog nqus coarse grain txheej; Thaum lub coarse grain txheej yog tas li, riveting cracking kev ua tau zoo ntawm lub over-aging lub xeev yog zoo dua li ntawm lub ncov aging xeev.
Table 3 Riveting tsos ntawm cov qauv 1 txog 3 nyob rau hauv ob txheej txheem txheej txheem
Cov teebmeem ntawm grain morphology thiab kev laus lub xeev ntawm axial compression cracking cwj pwm ntawm profiles tau kawm. Lub xeev kev nyuaj siab ntawm cov khoom thaum lub sij hawm axial compression yog zoo ib yam nrog tus kheej-piercing riveting. Txoj kev tshawb nrhiav pom tias cov kab nrib pleb los ntawm cov ciam teb, thiab cov txheej txheem tawg ntawm Al-Mg-Si alloy tau piav qhia los ntawm cov qauv.
σapp yog qhov kev ntxhov siab siv rau cov siv lead ua. Thaum tawg, σapp yog sib npaug rau qhov tseeb kev ntxhov siab tus nqi sib xws rau lub zog tensile; σa0 yog qhov tsis kam ntawm cov precipitates thaum intracrystalline zawv zawg; Φ yog qhov kev ntxhov siab concentration coefficient, uas muaj feem xyuam nrog cov nplej loj d thiab qhov dav dav p.
Piv nrog rau recrystallization, fibrous grain qauv yog ntau conducive rau cracking inhibition. Qhov laj thawj tseem ceeb yog tias cov qoob loo loj d tau txo qis vim yog cov nplej ua kom zoo dua qub, uas tuaj yeem txo qhov kev ntxhov siab zoo Φ ntawm cov ciam teb, yog li inhibiting cracking. Piv nrog cov qauv fibrous, qhov kev ntxhov siab concentration Φ ntawm recrystallized alloy nrog ntxhib nplej yog li 10 npaug ntawm qhov qub.
Piv nrog rau kev laus siab tshaj plaws, lub xeev dhau-laus yog qhov tsim nyog rau kev tawg inhibition, uas yog txiav txim siab los ntawm qhov sib txawv nag lossis daus theem hauv cov hlau. Thaum lub sij hawm peak aging, 20-50 nm 'β (Mg5Si6) theem yog precipitated nyob rau hauv lub 6082 alloy, nrog ib tug loj tus naj npawb ntawm precipitates thiab me me; Thaum cov hlau nyob rau hauv kev laus dhau lawm, tus naj npawb ntawm precipitates nyob rau hauv lub alloy txo thiab qhov loj yuav loj. Lub precipitates generated thaum lub sij hawm laus txheej txheem yuav zoo inhibit qhov kev txav ntawm dislocations nyob rau hauv lub alloy. Nws pinning quab yuam ntawm dislocations muaj feem xyuam rau qhov loj thiab ntim feem ntawm lub precipitate theem. Cov qauv empirical yog:
f yog qhov ntim feem ntawm cov theem precipitate; r yog qhov loj ntawm theem; σa yog lub zog cuam tshuam ntawm theem thiab matrix. Cov mis qhia tau hais tias qhov loj dua qhov loj ntawm lub precipitate theem thiab qhov me me ntawm qhov ntim feem, qhov me me nws pinning quab yuam ntawm dislocations, nws yog yooj yim dua rau dislocations nyob rau hauv lub alloy pib, thiab σa0 nyob rau hauv lub alloy yuav txo los ntawm lub ncov aging mus rau lub over-aging xeev. Txawm hais tias σa0 txo qis, thaum lub alloy mus los ntawm lub ncov aging mus rau lub dhau-laus lub xeev, σapp tus nqi thaum lub sij hawm ntawm tawg ntawm cov alloy txo ntau, uas ua rau ib tug tseem ceeb txo nyob rau hauv qhov kev nyuaj siab ntawm lub grain ciam (σapp-σa0). Qhov kev ntxhov siab zoo ntawm qhov ciam teb ntawm kev laus tshaj yog li 1/5 ntawm qhov siab tshaj plaws ntawm kev laus, uas yog, nws tsis tshua muaj kev tawg ntawm cov ciam teb hauv lub xeev dhau-laus, ua rau kev ua haujlwm zoo dua ntawm cov hlau.
2.2 Optimization ntawm extrusion kub thiab aging txheej txheem system
Raws li cov txiaj ntsig saum toj no, nce qhov kub ntawm extrusion tuaj yeem txo qhov tob ntawm txheej txheej coarse-grained, yog li inhibiting qhov tawg ntawm cov khoom thaum lub sij hawm riveting txheej txheem. Txawm li cas los xij, nyob rau hauv lub ntsiab lus ntawm qee cov alloy muaj pes tsawg leeg, extrusion tuag qauv thiab extrusion txheej txheem, yog hais tias tus extrusion kub siab dhau heev lawm, nyob rau hauv ib tes, lub dabtsi yog khoov thiab twist degree ntawm qhov profile yuav aggravated thaum lub sij hawm tom ntej quenching txheej txheem, ua rau cov profile loj kam rau ua tsis tau raws li qhov yuav tsum tau, thiab ntawm qhov tod tes, nws yuav ua rau cov hlau yuav yooj yim dua ntawm cov txheej txheem extrusion. Xav txog lub xeev riveting, profile loj txheej txheem, cov txheej txheem ntau lawm qhov rais thiab lwm yam, qhov zoo tshaj extrusion kub rau cov hlau no tsis tsawg tshaj li 485 ℃, uas yog, piv txwv No. 2. Yuav kom paub meej tias qhov zoo ntawm cov txheej txheem kev laus, cov txheej txheem kev laus tau optimized raws li cov qauv No 2.
Cov khoom siv tshuab ntawm cov qauv No. 2 ntawm lub sijhawm laus sib txawv ntawm 180 ℃, 185 ℃ thiab 190 ℃ yog qhia hauv daim duab 3, uas yog lub zog yield, tensile zog thiab elongation. Raws li pom nyob rau hauv daim duab 3a, nyob rau hauv 180 ℃, lub sij hawm laus nce los ntawm 6 h mus rau 12 h, thiab yield zog ntawm cov khoom tsis txo qis heev. Nyob rau hauv 185 ℃, raws li lub sij hawm laus nce los ntawm 4 h mus rau 12 h, lub zog tawm los ua ntej nce thiab tom qab ntawd txo qis, thiab lub sij hawm laus sib raug rau lub zog siab tshaj plaws yog 5-6 h. Nyob rau hauv 190 ℃, raws li lub sij hawm laus nce, lub zog tawm los maj mam txo. Zuag qhia tag nrho, ntawm peb qhov kev laus kub, qhov qis dua qhov kev laus, qhov siab dua qhov siab ntawm cov khoom siv. Cov yam ntxwv ntawm lub zog tensile hauv daim duab 3b yog zoo ib yam nrog lub zog tawm los hauv daim duab 3a. Qhov elongation ntawm qhov sib txawv ntawm cov laus kub uas pom hauv daim duab 3c yog nyob nruab nrab ntawm 14% thiab 17%, uas tsis muaj qhov txawv txav. Qhov kev sim no ntsuas qhov siab tshaj plaws rau kev laus dhau mus, thiab vim qhov kev sim me me sib txawv, qhov kev xeem yuam kev ua rau cov qauv hloov tsis meej.
Fig.3 Cov khoom siv hluav taws xob ntawm cov khoom ntawm qhov sib txawv ntawm kev laus thiab lub sijhawm laus
Tom qab cov txheej txheem kev laus saum toj no, qhov tawg ntawm cov pob qij txha riveted tau sau tseg hauv Table 4. Nws tuaj yeem pom los ntawm Table 4 tias nrog lub sijhawm nce, qhov tawg ntawm cov pob qij txha riveted yog suppressed rau ib yam twg. Nyob rau hauv cov xwm txheej ntawm 180 ℃, thaum lub sij hawm laus tshaj 10 h, cov tsos ntawm cov riveted sib koom yog nyob rau hauv ib tug txaus lub xeev, tab sis tsis ruaj khov. Nyob rau hauv cov xwm txheej ntawm 185 ℃, tom qab kev laus rau 7 h, cov tsos ntawm riveted sib koom ua ke tsis muaj kab nrib pleb thiab lub xeev kuj ruaj khov. Nyob rau hauv cov xwm txheej ntawm 190 ℃, cov tsos ntawm riveted sib koom ua ke tsis muaj kab nrib pleb thiab lub xeev ruaj khov. Los ntawm cov txiaj ntsig kev ntsuas riveting, nws tuaj yeem pom tias qhov kev ua tau zoo ntawm riveting yog qhov zoo dua thiab ruaj khov dua thaum cov hlau tsis muaj hnub nyoog dhau los. Ua ke nrog kev siv lub cev profile, riveting ntawm 180 ℃ / 10 ~ 12 h tsis haum rau kev ruaj ntseg zoo ntawm cov txheej txheem ntau lawm tswj los ntawm OEM. Txhawm rau kom muaj kev ruaj ntseg ntawm kev sib koom ua ke riveted, lub sijhawm laus yuav tsum tau txuas ntxiv, tab sis kev txheeb xyuas lub sijhawm laus yuav ua rau txo qis profile ntau lawm thiab cov nqi nce ntxiv. Nyob rau hauv cov xwm txheej ntawm 190 ℃, tag nrho cov qauv tuaj yeem ua tau raws li qhov yuav tsum tau muaj ntawm riveting cracking, tab sis lub zog ntawm cov khoom yog txo qis. Raws li qhov yuav tsum tau ua ntawm lub tsheb tsim, lub zog tawm ntawm 6082 alloy yuav tsum tau lav kom siab dua 270 MPa. Yog li ntawd, qhov kub thiab txias ntawm 190 ℃ tsis ua tau raws li cov khoom siv zog. Nyob rau tib lub sijhawm, yog tias cov khoom siv zog tsawg dhau lawm, cov seem seem ntawm cov phaj hauv qab ntawm cov riveted sib koom yuav tsawg dhau. Tom qab kev laus ntawm 190 ℃ / 8 h, riveted cross-sectional yam ntxwv qhia tau hais tias cov residual thickness yog 0.26 hli, uas tsis tau raws li qhov yuav tsum tau index ntawm ≥0.3 hli, raws li qhia nyob rau hauv daim duab 4a. Xav paub ntau ntxiv, qhov zoo tshaj plaws kev laus kub yog 185 ℃. Tom qab kev laus rau 7 h, cov khoom tuaj yeem ua tau raws li qhov yuav tsum tau ua riveting, thiab lub zog ua tau raws li qhov yuav tsum tau ua. Xav txog qhov kev ruaj ntseg ntawm cov txheej txheem riveting nyob rau hauv lub vuam Rhiav, lub sij hawm zoo tshaj plaws rau kev laus yog xav kom txiav txim siab li 8 h. Cov yam ntxwv ntawm tus ntoo khaub lig nyob rau hauv cov txheej txheem txheej txheem no tau qhia hauv daim duab 4b, uas ua tau raws li qhov xav tau ntawm kev sib cuam tshuam. Sab laug thiab sab xis interlocks yog 0.90 hli thiab 0.75 hli, uas ua tau raws li qhov yuav tsum tau ua index ntawm ≥0.4 hli, thiab hauv qab residual thickness yog 0.38 hli.
Table 4 Cracking ntawm tus qauv No. 2 ntawm qhov sib txawv ntawm qhov kub thiab txias lub sij hawm sib txawv
Fig.4 Hla-sectional yam ntxwv ntawm cov pob qij txha riveted ntawm 6082 hauv qab daim hlau ntawm ntau lub xeev laus
3 Kev xaus
Qhov siab dua qhov extrusion kub ntawm 6082 aluminium alloy profiles, qhov ntiav cov txheej txheej coarse-grained tom qab extrusion. Qhov ntiav ntxhib-grained txheej thickness tuaj yeem txo qhov kev ntxhov siab ntawm qhov ciam teb, yog li inhibiting riveting cracking. Kev tshawb fawb soj ntsuam tau txiav txim siab tias qhov zoo tshaj plaws extrusion kub tsis tsawg dua 485 ℃.
Thaum lub thickness ntawm coarse-grained txheej ntawm 6082 aluminium alloy profile yog tib yam, qhov kev ntxhov siab zoo ntawm cov ciam teb ntawm cov hlau nyob rau hauv lub hnub nyoog laus tshaj yog tsawg dua li hauv lub ncov laus lub xeev, qhov kev pheej hmoo ntawm kev tawg thaum lub sij hawm riveting yog me me, thiab riveting kev ua tau zoo ntawm cov hlau yog zoo dua. Noj mus rau hauv tus account peb yam ntawm riveting stability, riveted sib koom interlocking tus nqi, kev kho cua sov ntau lawm efficiency thiab nyiaj txiag kev pab cuam, qhov zoo tshaj plaws aging system rau cov alloy yog txiav txim siab mus rau 185 ℃ / 8h.
Post lub sij hawm: Apr-05-2025
