Txhua tus neeg koom nrog hauv kev tsim kho tshuab yeej paub zoo nrog lub npe "40Cr." Thaum cov khoom no tau teev nyob rau hauv daim ntawv qhia, tus tsim qauv feem ntau ntseeg siab rau qhov kev xaiv: nws muaj lub zog txaus, zoo toughness, thiab teb zoo rau kev kho cua sov.
40Cr Steel - Dongguan Tongyi Hlau
Tab sis koj puas tau xav txog -muab cov qib steel ntau heev muaj nyob rau hauv kev ua lag luam- yog vim li cas 40Cr tshwj xeeb yog siv dav tshaj plaws?
Hnub no, cia peb tshawb xyuas qhov ua rau 40Cr yog qhov tshwj xeeb.
I. Dab tsi yog 40Cr?
Kev faib tawm tag nrho rau 40Cr yog "cov qauv hlau alloy." Raws li lub npe implies, nws tsis yog cov pa roj carbon zoo tib yam; nws muaj ntxiv alloying ntsiab.
Cov tshuaj muaj pes tsawg leeg ntawm 40Cr feem ntau tswj raws li hauv qab no: cov ntsiab lus carbon ntawm 0.37% thiab 0.44%, thiab chromium cov ntsiab lus ntawm 0.80% thiab 1.10%. Cov carbon ua kom lub zog, thaum chromium txhim kho hardenability.
40Cr - Shanghai Shiheng Alloy (Group) Co., Ltd.
Txawm li cas los xij, tus nqi tseeb ntawm 40Cr nyob tsis yog nyob rau hauv nws cov ntsiab lus chromium, tab sis nyob rau hauv qhov tseeb tias, ua raws li kev kho cua sov kom zoo, nws ua tiav qhov sib npaug zoo ntawm lub zog, tawv, thiab hnav tsis kam.
Hauv cov ntsiab lus yooj yim: nws yog ib qho nyuaj thaum nws yuav tsum tau ua kom tawv thiab tawv thaum nws yuav tsum tawv -tag nrho- rounder tsis muaj cov ntsiab lus tsis muaj zog.
II. Plaub qhov zoo tshaj plaws -txhua qhov zoo tshaj plaws
40Cr yog dav siv feem ntau vim muaj plaub lub peev xwm hauv qab no:
Ua ntej, siab zog. Tom qab quenching thiab tempering, 40Cr tuaj yeem ua tiav lub zog tensile tshaj 980 MPa thiab lub zog tawm los tshaj 785 MPa. Qib ntawm lub zog no ntau tshaj qhov txaus los tswj cov load-cov kev cai ntawm cov khoom siv tshuab feem ntau.
Duab
Thib ob, zoo toughness. Hardness ib leeg tsis txaus; cov khoom siv kuj yuav tiv taus qhov cuam tshuam. Tom qab quenching thiab tempering, 40Cr qhia qhov cuam tshuam lub zog nqus ntawm ntau dua 47 Joules thiab txo qis ntawm thaj tsam tshaj 45%. Muaj ob lub zog thiab toughness kom ntseeg tau tias nws yog resistant rau brittle puas.
Thib peb, zoo heev hnav tsis kam. Txawm tias nyob rau hauv lub xeev quenched thiab tempered, 40Cr nthuav tawm qhov hnav tsis kam. Yog tias qhov chaw ua haujlwm tshwj xeeb-xws li cov ntawv xov xwm ncej, splines, lossis iav hniav- yuav tsum tau ua kom tawv tawv dua, induction hardening tuaj yeem ua tau tom qab kev kho cua sov thawj zaug, ua tiav qhov tawv tawv ntawm 48 txog 55 HRC. Plaub, nws muaj zoo hardenability. Piv nrog rau cov qauv 40 lossis 45 qib steels, 40Cr nthuav qhia kev txhim kho hardenability vim qhov sib ntxiv ntawm chromium. Roj quenching tuaj yeem ua rau cov ntu nrog txoj kab uas hla ntawm 15-40 hli, thaum cov dej quenching tuaj yeem ua rau cov seem ntawm 28-60 hli. Qhov no ua rau nws yooj yim dua kom ua tiav cov khoom sib xws hauv nruab nrab - qhov loj me.
III. Lub ntsiab lus dag hauv kev kho cua sov, tsis yog cov khoom siv xwb
Ntau tus neeg xav tias 40Cr yog npaj siv tam sim tom qab yuav khoom; Qhov tseeb, feem ntau ntawm nws cov yam ntxwv ua tau zoo yog muab los ntawm cov txheej txheem kho cua sov.
Txoj kev kho cua sov classic rau 40Cr yog "quenching thiab tempering" (Q & T).
Cov txheej txheem pom zoo yuav suav nrog roj quenching ntawm 850℃tom qab tempering ntawm 520 degree. Tau kawg, hauv kev tsim khoom tiag tiag, kev hloov kho yuav tsum tau ua raws li qhov loj me thiab cov khoom siv muaj.
Dab tsi microstructure ua 40Cr tau txais tom qab quenching thiab tempering? Tempered sorbite. Qhov no microstructure yog tus cwj pwm los ntawm kev sib xyaw ua ke ntawm siab zog thiab toughness.
IV. Nws siv qhov twg?
40Cr muaj ntau yam kev siv.
Ncej Cheebtsam yog nws lub ntsiab tseem ceeb -tsav shafts, spindles, splined shafts, thiab crankshafts txhua zaus siv 40Cr.
Nws kuj yog feem ntau siv rau cov khoom sib kis xws li cov iav, kab txaij, thiab sprockets.
Tsis tas li ntawd, nws yog siv rau cov khoom uas raug kev nyuaj siab, xws li kev sib txuas cov pas nrig, pins, thiab steering knuckles.
Yog hais tias ib feem yuav tsum tau tiv taus nruab nrab - mus rau - siab loads, muaj ib tug tsim nyog tus ntoo khaub lig-section, thiab yuav tsum tau ib tug sib npaug ntawm cov khoom siv kho tshuab, 40Cr feem ntau yog qhov kev xaiv saum toj kawg nkaus.
V. Pitfalls kom zam thaum siv 40Cr
Thaum 40Cr yog cov khoom siv zoo heev, nws tsis tuaj yeem siv tsis raug. Khaws cov ntsiab lus hauv qab no hauv siab thaum lub sijhawm tsim:
Ua ntej, kev kho cua sov yog qhov tseem ceeb . 40Cr feem ntau yog siv nyob rau hauv lub xeev quenched thiab tempered. Yog hais tias cov khoom yog machined thiab muab tso rau hauv kev pab cuam yam tsis muaj kev kho cua sov, nws zoo nyob rau hauv lub zog thiab toughness yuav tsis tau paub. Kev kho cua sov yuav tsum tau ua thiab hardness ranges yuav tsum tau qhia meej meej nyob rau hauv engineering drawings.
Qhov thib ob, zam kev vuam . 40Cr muaj qhov tsis zoo weldability. Vim nws cov ntsiab lus carbon siab, cov vuam seam thiab cov cua sov- cuam tshuam rau thaj chaw muaj kev kub ntxhov. Yog tias qhov vuam yog qhov tsim nyog, cov khoom siv yuav tsum tau preheated rau 200-300 degree, qis- hydrogen electrodes yuav tsum tau siv, thiab ib qho kev tshaj tawm -weld hydrogen- yuav tsum tau tshem tawm kev kho mob - ua cov txheej txheem nyuaj thiab pheej hmoo. Nws yog qhov zoo tshaj kom tsis txhob welded qauv yog tias ua tau.
Thib peb, ua tib zoo ceev faj nrog loj - hla- ntu ntu. Txawm hais tias 40Cr muaj hardenability zoo dua li cov pa roj carbon zoo tib yam, nws tsis txwv. Yog hais tias tus ntoo khaub lig- ntu loj dhau, cov tub ntxhais yuav tsis tawv tag, ua rau cov khoom tsis sib xws. Hauv cov xwm txheej zoo li no, xav txog cov ntaub ntawv uas muaj zog dua, xws li 35CrMo lossis 42CrMo.
Plaub, xyuas kom meej cov duab kos yog tus qauv. Tsuas sau ib feem "40Cr" tsis txaus. Feem ntau, rau quenched thiab tempered qhov chaw, cov specification yuav tsum nyeem:
Quenched thiab tempered; hardness 28-32 HRC.
Yog hais tias yuav tsum tau localized hnav tsis kam, qhia:
Quenched thiab tempered; hardness 28-32 HRC; induction hardening nyob rau hauv qhov chaw qhia; nto hardness 48-55 HRC; zoo hardened txheej tob 2-3 mm.
VI. Yog li, koj xaiv li cas?
Ntawm no yog ib qho piv txwv zoo: 45 steel yog "tus qauv yooj yim," 40Cr yog "tus qauv kev nplij siab," thiab 42CrMo yog "siab- qauv."
Rau qhov chaw nrog me me ntoo khaub lig-sections thiab lub teeb loads, 45 steel txaus. Rau nruab nrab ntoo khaub lig- ntu thiab cov qauv thauj khoom, 40Cr muab tus nqi zoo tshaj - kev ua tau zoo. Rau cov ntoo khaub lig loj - ntu thiab xav tau kev ua haujlwm, 42CrMo yog qhov kev xaiv zoo.
Yog vim li cas 40Cr tau dhau los ua "mus-rau" cov khoom siv hauv kev tsim kho tshuab ua rau ib yam: kev ua haujlwm sib luag, tus nqi nruab nrab, thiab kev ua haujlwm loj.
Tej zaum nws yuav tsis yog qhov zoo tshaj plaws nyob rau hauv ib qho kev ntsuas, tab sis nws tsis muaj qhov tsis muaj zog ntawm lub zog, toughness, hnav tsis kam, lossis hardenability. Rau ib tug engineer, ib qho zoo - cov khoom sib npaug zoo li qhov no muab kev thaj yeeb nyab xeeb tshaj plaws ntawm lub siab.
