Key-locking inserts yog threaded inserts nrog ob los yog plaub tus yuam sij me me uas tau tsav mus rau hauv niam txiv cov khoom tom qab kev teeb tsa. Cov yuam sij no mechanically xauv lub ntxig rau kev sib hloov, uas yog vim li cas engineers ncav cuag lawv thaum sib koom ua ke yuav tsum muaj sia nyob ruaj khov. Nyob rau hauv aerospace thiab tsheb tsim nyog cov kev pab cuam, tus yuam sij - xauv inserts ib txwm outlast pa inserts los ntawm 3 mus rau 5 zaug ua ntej ntsuas preload poob tshwm sim.
Yog vim li cas threaded pob qij txha tsis nyob rau hauv vibration
Lub bolted sib koom ua ke yog lub caij nplooj ntoos hlav. Thaum dynamic loads mem tes nws nyob ze ntawm nws lub ntuj hom, kev sib txhuam tuav cov xov tawg ib ntus thiab lub fastener tig rov qab los ntawm lub kaum sab xis me me txhua lub voj voog. Junker's 1969 transverse- kev sim vibration tau pom tias tus qauv txiv ntoo tuaj yeem poob 100% ntawm nws cov khoom ua ntej hauv ib feeb. Hauv kev pabcuam kev ua haujlwm tsis ua haujlwm qeeb, tab sis cov txheej txheem yog tib yam: preload decays 15 mus rau 40% nyob rau hauv thawj ob peb txhiab cycles, threads polish thiab kev sib txhuam tee ntxiv, thiab qaug zog tawg pib ntawm thawj cov xov uas kev ntxhov siab concentration khiav 3 mus rau 4 zaug nominal. Txawm hais tias tus nqi qis-1% txo qis tseem ceeb thaum lub tshuab cua nqa kaum tawm txhiab tus fasteners.
Aerospace applications
Feem ntau cov chaw muaj xws li fuselage pob qij txha, lub rooj zaum lem, ntsuas vaj huam sib luag, thiab cav accessory brackets. Kev tsim nyog raws li RTCA DO-160G Tshooj 8 random vibration tshaj 10 Hz mus rau 2,000 Hz, nrog PSD toj siab ntawm 0.04 mus rau 0.10 g² / Hz, ntxiv rau kev khiav hauj lwm thiab kev poob siab ib ntu 7. Txhua axis khiav tsawg kawg yog 1 teev.
Cov kws kho tsheb taug qab qhov seem seem ntawm lub zog tawg, khaws cia ua ntej ntawm cov cuab yeej ntxhua khaub ncaws lossis lim-gauged bolts, thiab txhua qhov pom kev sib hloov. Ib qho kev hla feem ntau txhais tau tias tsawg dua 10% poob hauv clamp load. Thoob plaws cov ntaub ntawv OEM luam tawm, qhov tseem ceeb- xauv qhov ntxig rau hauv 7075-T6 thiab 6061-T6 txhuas qhia qhov tseem ceeb xoom kev sib hloov tom qab 10⁶ cycles thiab khaws ntau dua 85% ntawm kev teeb tsa lub zog tawg. Helical-coil inserts ntawm tib lub fixtures feem ntau poob mus rau 60 mus rau 70%.
Automotive applications
Nyob rau hauv tsheb, tus yuam sij - xauv qhov ntxig yuav tshwm nyob rau hauv subframes, tswj caj npab mounts, cav thiab kis tau tus mob brackets, thiab lub rooj zaum anchors. Lub ncov qis dua g tshaj aerospace, tab sis loj heev tag nrho cov voj voog dhau 10 mus rau 15 xyoo lub neej. Validation feem ntau ua ke nrog 5 mus rau 500 Hz sine sweep kom pom resonances nrog random vibration matched rau txoj kev -load cov ntaub ntawv, feem ntau ib GMW3172. Cheebtsam kuaj lub hom phiaj sib npaug rau kev puas tsuaj rau 240,000 km, uas tsaws ntawm 50 mus rau 200 teev ib axis ntawm lub shaker.
Raws li ISO 16047 transverse vibration testing (qhov kev ntsuam xyuas Junker niaj hnub), qhov tseem ceeb - kaw cov pob qij txha feem ntau khaws ntau tshaj 90% ntawm kev teeb tsa ua ntej tom qab 2,000 lub voj voog ntawm 0.7 hli ncov - mus rau -peak amplitude, thaum cov pa fasteners ntawm tib lub 50% feem ntau poob. Ib tug xoob lub rooj zaum ntsia liaj qhov rooj yog ib tug warranty thov. Ib qho xoob subframe bolt yog ib qho kev nco qab. Ntxiv ib tus yuam sij-xauv ntxig tus nqi xees rau ib chav tsev thiab tshem tawm hom tsis ua haujlwm uas kim nrhiav hauv thaj teb.
Qhov tseem ceeb vibration test parameter
Plaub tus lej no yog cov engineers rechaw nres nkoj thaum tsim nyog tus yuam sij -locked sib koom. Lwm yam yog txhawb cov ntaub ntawv.
|
Parameter |
Hom phiaj |
Yuav ntsuas li cas |
|
Anti-kev sib hloov |
0℃insert tig |
Pom kev siv cim ua ntej thiab tom qab kev co; txheeb xyuas ntawm 10x magnification |
|
Preload khaws cia |
Ntau tshaj lossis sib npaug li 85% ntawm kev teeb tsa |
Instrumented ntxhua khaub ncaws lossis lim- ntsuas qhov ntsia hlau, kuaj ua ntej, thaum, thiab tom qab kuaj |
|
Breakaway torque |
Ntau dua lossis sib npaug li 70% ntawm qhov nruab torque |
Calibrated digital torque wrench, siv nyob rau hauv lub loosening direction post-test |
|
Axial rub- tawm |
Ib MIL-I-45914A los yog NASM33537 |
Kaumile xeem ntawm qhov ntxig rau hauv cov khoom niam txiv ntawm cov khoom ntsuas ntsuas, tom qab- vibration |
Thaum twg los qhia tus yuam sij -locking insert
Siv ib qho thaum qhov sib koom ua tau raws li tsawg kawg ib qho ntawm cov xwm txheej no:
- Cov khoom siv niam txiv yog aluminium, magnesium, lossis ib qho alloy hauv qab no kwv yees li 480 MPa tensile lub zog, nrog rau steel mating bolt.
- Qhov sib koom ua ke pom kev sib txuas ntawm qhov sib txawv siab tshaj 0.04 g² / Hz lossis kev hloov pauv hloov siab tshaj 0.5 mm ncov - mus rau - ncov.
- Kev tshem tawm thiab rov txhim kho lub voj voog yuav tsum tau ua (qhov tseem ceeb - xauv qhov ntxig tuav 10+ voj voog yam tsis ntsuas xov hnav).
- Kev soj ntsuam kev nkag tau raug txwv, ua rau tus kheej - kev daws teeb meem zoo dua rau xov xov xauv.
Yog tias qhov sib koom ua ke yog statically loaded, niam txiv yog hlau ntawm qib zoo sib xws rau lub ntsia liaj qhov rooj, los yog lub rooj sib txoos yog ib leeg - siv thiab torqued kom tawm los, ib tug txheej txheem insert los yog ib tug dawb tapped qhov yuav ua txoj hauj lwm ntawm tus nqi qis. Lub tshuab tseem ceeb yog tag nrho cov ntsiab lus: nws hloov kev sib txhuam-tsuas yog sib koom ua ke rau hauv ib qho kev kaw zoo, thiab qhov kev xaiv tsim ib leeg yog qhov tshwm sim raws li 3 txog 5x kev txhim kho nyob rau hauv DO-160G, GMW3172, thiab ISO 16047.
