Preload decay law of rail bolts and long-term torque retention technology
Dab tsi yog qhov laj thawj tseem ceeb ntawm kev khiav bolt preload decay, thiab lawv cov proportions yog dab tsi?
Preload decay stems los ntawm peb yam tseem ceeb: ua ntej, "kev ntxhov siab so" nyob rau hauv cov xov khub, accounting rau kwv yees li 40% ntawm tag nrho cov lwj, ib tug inherent yam ntxwv ntawm hlau nyob rau hauv ntev - lub sij hawm kev ntxhov siab; thib ob, "creep deformation" ntawm qhov chaw sib cuag, suav txog 35%-micro-yas deformation ntawm qhov chaw sib cuag (ntses daim hlau, ntxhua khaub ncaws) hauv qab lub siab txo qhov bolt elongation; thib peb, "fretting hnav," accounting rau 25%-micro- txav ntawm cov xov thaum vibration hnav cov hniav, ua rau poob ua ntej. Cov peb yam no cuam tshuam nrog kev sib koom ua ke los ua kom tsis tu ncua ua ntej kev poob qis.
Yuav ua li cas npaum li cas preload decay ua rau muaj kev ruaj ntseg khiav lag luam?
Kev lag luam specifications qhia meej meej tias thaum qhov tseeb preload ntawm cov bolts poob qis dua 70% ntawm tus nqi tsim, kev ua haujlwm kev nyab xeeb yog kev puas tsuaj. Nyob rau ntawm lub sijhawm no, qhov ntev thiab sab nraud ntawm lub fastening system txo qis heev, ua tsis tau zoo txwv txoj kev tsheb ciav hlau. Ntawm cov pa kab, qhov no ua rau ntsuas qhov dav thiab kev tsheb ciav hlau nkag; nyob rau hauv siab - cov kab ceev, txawm tias 30% preload txo qis exacerbates dynamic log-rail kev sib tshuam, ua rau lub tsheb ciav hlau tsis zoo thiab muaj peev xwm hloov pauv tsis ua haujlwm. Yog li, 70% preload yog suav tias yog "kev nyab xeeb kab liab."
Dab tsi yog qhov tseem ceeb ntawm -lub sij hawm torque retention technology, thiab lawv lub luag haujlwm yog dab tsi?
Nws suav nrog peb yam tseem ceeb: kev ua kom zoo ntawm cov khoom siv- siv siab - lub zog alloy steel thiab kho kom zoo rau kev kho cua sov los txhim kho kev ntxhov siab; kev tsim qauv- txais yuav wedge lock washers thiab thread locking adhesives kom structurally tiv thaiv preload poob; kev tswj cov txheej txheem- ua raws li kev tswj cov torque thiab kev kuaj ua ntej kom paub tseeb tias thawj zaug ua ntej ua tau raws li cov qauv thiab tsis sib xws. Cov khoom siv optimization hais txog "thaum sab hauv," tus qauv tsim thaiv "sab nraud ua rau," thiab cov txheej txheem tswj tau lees tias "thawj lub xeev," sib sau ua tiav ntev - lub sij hawm torque tuav.
Dab tsi yog qhov cuam tshuam inhibitory ntawm kev sib txuas xov xauv cov nplaum nrog cov xauv lub tshuab ntxhua khaub ncaws ntawm preload lwj?
Xov locking adhesives (piv txwv li, anaerobic adhesives) sau cov qhov khoob thiab tsim ib daim ntawv cog lus nruj tom qab kho, tshem tawm tag nrho cov fretting hnav ntawm threads thiab inhibiting kev ntxhov siab so. Ua ke nrog wedge xauv lub tshuab ntxhua khaub ncaws, qhov no ua tiav "kev tiv thaiv dual": cov tshuab ntxhua khaub ncaws them nyiaj rau cov khoom siv ua ntej los ntawm kev ua haujlwm, thaum cov nplaum kaw cov xov xov los ntawm kev ua tshuaj lom neeg. Cov ntaub ntawv ntsuam xyuas qhia tau hais tias qhov kev sib xyaw ua ke no txo bolt preload decay tus nqi ntau dua 80%; tom qab 5 xyoos ntawm kev pabcuam, preload tseem nyob siab dua 90% ntawm tus nqi tsim qauv -deb superior rau ib qho kev tiv thaiv -loosing ntsuas.
Yuav ua li cas los soj ntsuam bolt preload decay ntawm -site, thiab dab tsi yog txoj kev tshawb pom tseeb tshaj plaws?
Kev tshuaj xyuas niaj hnub siv lub zog torque wrenches rau "kev ntsuam xyuas rov ua kom rov zoo," ncaj qha txiav txim siab ua ntej kev puas tsuaj los ntawm kev sib piv cov torque rov qab nrog thawj lub zog torque- txoj kev no muaj qhov yuam kev loj. Txoj kev raug tshaj plaws yog siv "ultrasonic preload tester," uas suav cov bolt elongation tiag tiag los ntawm kev ntsuas lub sij hawm nthuav tawm ultrasonic, ncaj qha muab cov nqi preload nrog qhov yuam kev tsawg dua lossis sib npaug li 3%. Rau qhov tseem ceeb ntawm qhov siab- nrawm thiab hnyav- cov kab tsheb thauj khoom, kev tshuaj xyuas zoo siv ultrasonic kuaj yuav tsum tau ua tsis tu ncua kom hloov cov bolts nrog tsis txaus preload.