Daim duab morphology thiab cov ntsiab lus ntawm cov ntaub ntawv sib txawv ntawm cov pob txha muaj zog

Kev siv ntawmmuaj zog boltsyog dav heev, xws li nyob rau hauv aerospace, roj av machinery, tsheb loj / tsheb thauj khoom, thiab lwm yam. Thaum lub sij hawm siv cov bolts siab zog, hom tsis ua hauj lwm feem ntau yog tawg. Qhov xwm txheej tawg ntawm bolts txawv nyob ntawm kev siv. Qee lub zog muaj zog bolts yog qaug zog tawg, qee qhov yog pob txha tawg, thiab qee qhov yog pob txha tawg. Raws li peb txoj kev nkag siab ntawm kev siv cov fasteners thiab bolts, Zhonghua Standard Parts Network yuav qhia hauv qab no cov kab kos duab morphology thiab cov laj thawj sib xws rau cov bolts muaj zog.
Piv txwv 1: morphology daim duab ntawm qaug zog tawg daim ntawv ntawm lub zog siab bolt

Daim duab 1 qhia txog kev qaug zog ntawm cov bolts muaj zog

Ntawm lawv, pob txha A yog pob txha pob txha, thiab pob txha B yog kev qaug zog tawg. Thaum qaug zog pob txha thiab toughness fracture coexist, qaug zog tawg yog thawj tawg, yog li nws muaj peev xwm inferred tias b steel bolt yog thawj tawg. Lub xoob haum ntawm cov xov nyob rau hauv ntu A ~ B ntawm bolt B ua rau muaj kev ntxhov siab ntawm txoj hauj lwm B. Sij hawm dhau mus, microcracks maj mam tsim nyob rau hauv kev sib hloov kev ntxhov siab ntawm crankshaft rotation, thaum kawg ua rau ntau qhov chaw qaug zog tawg. Tom qab B steel ntsia liaj qhov rooj tawg, A steel ntsia liaj qhov rooj tsis muaj peev xwm dais lub zog tsim los ntawm kev sib hloov ntawm lub crankshaft, uas ua rau overload tawg. Hauv cov ntsiab lus, qhov xoob haum ntawm cov xov hauv ntu A ~ B ntawm Bsteel ntsia liaj qhov roojtau ua rau hnav ntawm cov xov ntawm lub ntsia liaj qhov rooj thiab lub qhov taub hauv qhov chaw no. Qhov sib npaug thaiv thiab crank caj npab kuj dhau los ua xoob, ua rau muaj qhov micro vibration ntawm qhov chaw sib txuas ntawm ob. Nyob rau tib lub sijhawm, kev ntxhov siab tshwm sim ntawm txoj hauj lwm B, thiab nyob rau hauv kev sib hloov ntawm kev ntxhov siab ntawm lub crankshaft tig rau lub sijhawm ntev, micro tawg maj mam tsim, thaum kawg ua rau ntau qhov kev qaug zog tawg. Tom qab B steel ntsia liaj qhov rooj tawg, A steel ntsia liaj qhov rooj tsis txaus los dais lub zog tsim los ntawm kev sib hloov ntawm lub crankshaft, ua rau overload tawg, qhov seem thaiv ya tawm, thiab kev puas tsuaj rau cov khoom siv cav. Qhov tawg ntawm steel bolts muaj feem xyuam rau qhov tsis txaus nruj axial quab yuam ntawm qhov sib npaug thaiv kho bolts thaum lub sijhawm teeb tsa.
Piv txwv 2: morphology daim duab ntawm brittle fracture daim ntawv ntawm high-strength bolt

Daim duab 2 qhia txog qhov tawg ntawm lub bolt

Kev tsom xam macroscopic ntawm qhov tawg ntawm lub siab-lub zog ntsia liaj qhov rooj qhia tau hais tias cov ntsia liaj qhov rooj nyob rau hauv daim duab 2 belongs rau ib tug brittle fracture nto. Kev sim ntxiv ntawm cov cuab yeej cuab tam qhia tau hais tias qhov hardness thiab lub zog ntsuas ntawm lub siab-lub zog ntsia liaj qhov rooj yog qhov siab, nrog rau siab yield rau lub zog piv ntawm 0.95; Lub elongation, cross-sectional shrinkage, thiab cuam tshuam lub zog tag nrho txo ​​qis tsis tu ncua nrog kev nce zog thiab hardness. Yog li ntawd,boltsyog raug rau lub zog nruj ua ntej, rov ua dua kev ntxhov siab, thiab lub zog siab vibration loads thaum lub sijhawm ua haujlwm, thiab cov pob txha tawg feem ntau tshwm sim thaum siv ntawm qhov chaw. Cov ntaub ntawv ntsuam xyuas kev ua tau zoo ntawm cov tshuab qhia tau hais tias kev txhim kho cov khoom toughness yog tsim nyog. Nyob rau hauv cov ntaub ntawv ntawm cov khoom fixation, txo lub zog Performance index kom tsim nyog los txhim kho toughness yog ib tug zoo rotation. Lub zog sacrificial yuav tau them rau los ntawm kev nce lub bolt txoj kab uas hla.
Piv txwv 3: morphology daim duab ntawm qhov tsis xws luag fracture form of high-strength bolt

Daim duab 3 qhia txog qhov tsis xws luag ntawm cov bolts muaj zog

Daim duab 3: Thaum lub zog muaj zog bolt tawg, nws pib tawg ntawm lub chamfer ntawm threaded groove nrog ib tug high degree ntawm kev nyuaj siab concentration. Qhov chaw pib tawg muaj ntau qhov kev tsim kua muag, feem ntau nyob rau hauv daim ntawv ntawm cleavage, thiab nthuav tawm cov yam ntxwv ntawm cov pob txha tawg. Lub bolt yog raug rau kev ntxhov siab
Qhov tshwm sim ntawm intergranular puas. Tom qab qhov tawg pib los ntawm qhov tawg, qhov tawg sai sai thiab tsis ruaj khov propagates kom txog thaum nws tawg. Lub xub ntiag ntawm coarse grains thiab grain ciam ciam sib cais tsis xws luag nyob rau hauv cov khoom ua rau ib tug txo nyob rau hauv qhov tseeb tso cai kev nyuaj siab, uas kuj yog ib tug prerequisite rau ceev ceev tsis ruaj tsis khov propagation. Kev tsim ntawm microcracks muaj feem xyuam rau kev ua tsis tiav degassing thiab slagging thaum smelting. Lub sib dhos torque ntawm bolts fluctuates zoo heev, thiab muaj qhov tshwm sim ntawm kev nruj dua; Lub vojvoog ntawm lub kaum sab xis ntawm qhov sib koom ua ke ntawm lub taub hau ntsia liaj qhov rooj thiab tus pas nrig fluctuates zoo heev, thiab qee qhov ntawm lawv tsis ua raws li tus qauv yuav tsum tau ua. Muaj teeb meem ntawm kev tswj tsis tau zoo ntawm qhov tseeb qhov tseeb hauv cov txheej txheem bolt ntau lawm.
Thaum lub sij hawm cov txheej txheem bolt ntau lawm, cov teeb meem xws li hnav ntawm R-lub kaum sab sauv nto thiab thermal qaug zog tawg tau pom nyob rau ntawm qhov chaw ua hauj lwm ntawmsiab zog boltkub pier pwm. Cov pwm txhawb nqa nto tau hnyav hnyav thiab corroded, thiab kev hloov kho tau ua nrog cov nplaum nplaum. Tsis tas li ntawd, tus nqi R ntawm lub taub hau ntsia liaj qhov rooj sib koom tsis tau tswj hwm ntawm qhov chaw tsim khoom. Cov kev tsis zoo no tiv thaiv cov pwm los ntawm kev ua kom muaj kev ruaj ntseg xws li ntsia liaj qhov rooj coaxiality thiab perpendicularity, uas tuaj yeem cuam tshuam cov khoom zoo thiab ua rau muaj kev pheej hmoo ntawm cov ntsia hlau tawg.