Feem ntau, lub taub hau ntsia liaj qhov rooj yog tsim los ntawm txias hau yas ua, piv nrog rau kev txiav, cov hlau fiber ntau (hlau hlau) raws cov duab ntawm cov khoom yog nruam, tsis muaj kev txiav hauv nruab nrab, uas txhim kho lub zog ntawm cov khoom, tshwj xeeb tshaj yog cov zoo heev mechanical properties.Cold heading forming process muaj xws li txiav thiab sib sau, ib zaug - nyem, ob npaug - nyem txias lub taub hau thiab ntau - txoj hauj lwm tsis siv neeg txias taub hau.Ib qho tsis siv neeg txias taub hau tshuab yog siv rau stamping, chim siab, extruding thiab txo txoj kab uas hla hauv ntau txoj kev tuag. .Simplex me ntsis los yog ntau lub chaw nres tsheb tsis siv neeg txias taub hau tshuab siv cov yam ntxwv ntawm cov khoom qub yog ua los ntawm cov khoom loj 5 mus rau 6 meters ntev bar lossis qhov hnyav yog 1900-2000 kg ntawm qhov loj ntawm cov hlau rod steel hlau, kev ua thev naus laus zis yog cov yam ntxwv ntawm kev sib sau txias txias tsis yog daim ntawv txiav ua ntej, tab sis siv lub tshuab txias tsis siv neeg lub taub hau nws tus kheej los ntawm bar thiab hlau qws steel hlau txiav thiab chim siab rau qhov khoob (yog tias tsim nyog). Ua ntej lub extrusion kab noj hniav, qhov khoob yuav tsum yuav hloov dua siab tshiab.Qhov dawb paug tuaj yeem tau txais los ntawm shaping.Cov dawb paug tsis tas yuav shaping ua ntej upsetting, txo txoj kab uas hla thiab nias.Tom qab qhov khoob raug txiav, nws raug xa mus rau upsetting chaw nres tsheb ua haujlwm.Qhov chaw nres tsheb no tuaj yeem txhim kho qhov zoo ntawm qhov khoob, txo qhov tsim quab yuam ntawm qhov chaw nres tsheb tom ntej los ntawm 15-17%, thiab txuas ntxiv lub neej ntawm pwm.Qhov precision tiav los ntawm kev sib sau txias kuj tseem cuam tshuam rau kev xaiv txoj kev sib sau thiab cov txheej txheem siv. Tsis tas li ntawd, nws kuj nyob ntawm qhov Cov yam ntxwv ntawm cov cuab yeej siv, txheej txheem cov yam ntxwv thiab lawv lub xeev, cov cuab yeej precision, lub neej thiab hnav degree.Rau siab alloy steel siv nyob rau hauv txias taub hau thiab extrusion, ua hauj lwm nto roughness ntawm hard alloy tuag yuav tsum tsis txhob Ra = 0.2um, thaum lub ua hauj lwm nto roughness ntawm xws li tuag mus txog Ra = 0.025-0.050um, nws muaj lub siab tshaj plaws lub neej.
Cov ntsia liaj qhov rooj xov feem ntau yog ua tiav los ntawm cov txheej txheem txias, kom cov ntsia hlau dawb paug nyob rau hauv ib txoj kab uas hla yog dov los ntawm cov xov phaj (tuag), thiab cov xov yog tsim los ntawm lub siab ntawm cov xov phaj (tuag). Nws yog dav siv vim. cov yas streamline ntawm cov ntsia hlau xov tsis raug txiav tawm, lub zog yog nce, qhov precision yog siab thiab zoo yog uniform.In thiaj li yuav tsim cov xov sab nraud txoj kab uas hla ntawm cov khoom kawg, qhov yuav tsum tau txoj kab uas hla ntawm cov xov dawb paug yog txawv, vim hais tias nws yog txwv los ntawm cov xov precision, seb cov ntaub ntawv txheej thiab lwm yam.Rolling (dov) nias xov yog ib txoj kev ntawm txoj kev xov cov hniav los ntawm yas deformation.Nws yog nrog cov xov nrog tib lub suab thiab conical zoo ntawm dov ( dov hlau phaj) tuag, ib sab rau extrude cylindrical plhaub, lwm sab kom lub plhaub rotation, qhov kawg dov tuag ntawm lub conical zoo hloov mus rau lub plhaub, kom cov xov forming.Rolling (rub) siab xov ua cov ntsiab lus. yog hais tias tus naj npawb ntawm dov kiv puag ncig yog tsis ntau dhau, yog tias ntau dhau, qhov ua tau zoo yog qhov tsawg, qhov chaw ntawm cov hniav ntawm cov hniav yooj yim los tsim kev sib cais los yog tsis sib haum xeeb buckle phenomenon.On qhov tsis sib xws, yog tias tus naj npawb ntawm cov kiv puag ncig me me dhau, xov txoj kab uas hla yog ib qho yooj yim rau plam lub voj voog, dov siab txawv txav nce nyob rau hauv lub sij hawm thaum ntxov, ua rau shortened tuag lub neej.Cov kev tsis xws luag ntawm dov xov: ib co nto tawg los yog khawb ntawm cov xov; Disorderly buckle; Cov xov yog tawm ntawm roundness.Yog hais tias cov no Cov tsis xws luag tshwm sim nyob rau hauv cov lej loj, lawv yuav pom nyob rau hauv cov txheej txheem ua.Yog tias qee qhov me me ntawm cov teeb meem no tshwm sim, cov txheej txheem ntau lawm yuav tsis pom cov kev tsis zoo no yuav ntws mus rau tus neeg siv, ua rau muaj teeb meem.Yog li ntawd, cov teeb meem tseem ceeb ntawm kev ua haujlwm yuav tsum tau muab sau tseg los tswj cov yam tseem ceeb no hauv cov txheej txheem ntau lawm.
Lub zog muaj zog fasteners yuav tsum tempered thiab tempered raws li cov kev xav tau.Lub hom phiaj ntawm kev kho cua sov thiab tempering yog los txhim kho cov cuab yeej cuab tam ntawm fasteners kom tau raws li qhov teev tseg tensile zog tus nqi thiab dabtsi yog khoov zog piv. internal zoo ntawm high-strength fasteners, tshwj xeeb tshaj yog nyob rau hauv nws zoo. Yog li ntawd, thiaj li yuav tsim tau cov khoom siv zoo high-strength fasteners, nws yog ib qho tsim nyog yuav tsum muaj cov cuab yeej siv kho cua sov siab heev.Vim muaj peev xwm ntau lawm thiab tus nqi qis ntawm cov bolts muaj zog, nrog rau cov qauv zoo thiab meej ntawm cov ntsia hlau xov, cov khoom siv kho cua sov yuav tsum muaj peev xwm ntau lawm, qib siab ntawm automation thiab zoo zoo ntawm kev kho cua sov.Txij li xyoo 1990, cov kab hluav taws xob txuas ntxiv nrog kev tiv thaiv huab cua tau nyob hauv txoj haujlwm tseem ceeb. Hom kev poob siab-hauv qab thiab net-siv rauv yog qhov tshwj xeeb tshaj yog haum rau kev kho cua sov thiab tempering ntawm me me thiab nruab nrab-qhov loj me fasteners.Tempering kab dhau li ntawm lub qhov cub kaw qhov kev ua tau zoo, tab sis kuj muaj cov cua kub siab, kub, thiab cov txheej txheem tsis zoo. lub computer tswj, khoom tsis ua hauj lwm tswb thiab tso saib functions.High-strength fasteners yog ua los ntawm kev noj - tu - cua sov - quenching - tu - tempering - coloring rau lub offline kab, zoo xyuas kom zoo ntawm kev kho cua sov.The decarburization ntawm cov ntsia hlau xov yuav ua rau lub fastener mus ncig ua ntej thaum nws ua tsis tau raws li qhov yuav tsum tau ntawm cov neeg kho tshuab kev ua tau zoo, uas yuav ua rau cov ntsia hlau fastener poob efficiency thiab shorten lub neej kev pab cuam.Vim cov raw khoom decarbonization, yog hais tias tus annealing yog tsis tsim nyog, yuav ua rau cov kev pab cuam lub neej. raw cov ntaub ntawv decarbonization txheej deepened.Thaum lub quenching thiab tempering kub kho, ib co oxidizing gases feem ntau yog coj los ntawm sab nraum lub cub tawg.Qhov xeb ntawm bar steel hlau los yog cov seem ntawm cov hlau xaim tom qab txias txias yuav decompose tom qab cua sov nyob rau hauv lub cub tawg. , generating ib co oxidizing gas.Steel hlau nto xeb, piv txwv li, yog nws ua los ntawm hlau carbonate thiab hydroxide, tom qab lub tshav kub yuav tawg mus rau hauv CO ₂ thiab H ₂ O, yog li aggravating lub decarburization.Cov kev tshwm sim qhia tau hais tias lub decarburization degree. Qhov nruab nrab carbon alloy steel yog hnyav dua li ntawm cov hlau, thiab qhov ceev tshaj plaws decarburization kub yog nyob nruab nrab ntawm 700 thiab 800 degrees Celsius.Vim qhov txuas ntawm cov hlau xaim decomposes thiab sib xyaw ua ke hauv carbon dioxide thiab dej ntawm qhov ceev ceev hauv qee yam. tej yam kev mob, yog hais tias lub nruam mesh siv rauv roj tswj tsis tsim nyog, kuj yuav ua rau cov ntsia hlau decarbonization yuam kev.Thaum ib tug high-strength bolt yog txias taub hau, raw khoom thiab cov annealed decarburizing txheej tsis tsuas yog tseem muaj, tab sis yog extruded rau lub sab saum toj ntawm cov xov, uas ua rau txo cov neeg kho tshuab zog (tshwj xeeb tshaj yog lub zog thiab puas ntsoog) rau saum npoo ntawm fasteners uas yuav tsum tau hardened. Tsis tas li ntawd, decarburization decarburization ntawm steel hlau, nto thiab sab hauv lub koom haum yog txawv thiab muaj sib txawv expansion coefficient, quenching tej zaum yuav tsim cov kab nrib pleb.Yog li ntawd, los tiv thaiv cov xov nyob rau sab saum toj ntawm lub decarburization nyob rau hauv tshav kub quenching, tab sis kuj rau raw cov ntaub ntawv tau raug me ntsis coated carbon decarburization ntawm fasteners, tig qhov kom zoo dua ntawm lub mesh siv rauv cua sov tiv thaiv nyob rau hauv lub hauv paus sib npaug. mus rau thawj cov ntsiab lus carbon thiab carbon txheej txheej, twb decarburization fasteners maj mam rov qab mus rau thawj cov ntsiab lus carbon, carbon muaj peev xwm yog teem nyob rau hauv 0.42% 0.48% advisable, nanotubes thiab quenching cua kub kub, tib yam tsis tau nyob rau hauv high kub, thiaj li tsis txhob ntxhib. Cov nplej, cuam tshuam rau cov khoom siv kho tshuab.Qhov teeb meem zoo ntawm cov fasteners nyob rau hauv quenching thiab quenching txheej txheem yog: quenching hardness yog tsis txaus; Uneven hardening hardness; quenching deformation overshoot; Quenching cracking. Cov teeb meem no feem ntau muaj feem xyuam rau cov ntaub ntawv raw, quenching cua sov. thiab quenching cua txias. Kev tsim kom raug ntawm cov txheej txheem kev kho cua sov thiab cov txheej txheem ntawm cov txheej txheem ntau lawm tuaj yeem zam qhov xwm txheej zoo li no.
Post lub sij hawm: May-31-2019