1. Lub hom phiaj
Nws yog tsuas yog siv los tsim cov kis tau tus mob hauv tsheb thiab tsheb laij teb, camshafts, piston pins thiab lwm yam tshuab qhov chaw ntawm lub tshuab hluav taws xob sab hauv. Cov khoom zoo li no raug kev sib txhuam thiab hnav thaum ua haujlwm, thiab tib lub sij hawm dais loj alternating loads, tshwj xeeb tshaj yog cuam tshuam loads.
2. Cov kev xav tau ntawm kev ua haujlwm
(1) Cov txheej txheej carburized nto muaj qhov tawv tawv kom ntseeg tau zoo heev hnav tsis kam thiab tiv taus qaug zog, nrog rau cov yas tsim nyog thiab tawv.
(2) Cov tub ntxhais muaj zog toughness thiab txaus lub zog. Thaum lub toughness ntawm cov tub ntxhais yog tsis txaus, nws yog ib qho yooj yim mus tawg nyob rau hauv tej yam load los yog overload; Thaum lub zog tsis txaus, lub nkig carburized txheej yog yooj yim tawg thiab tev tawm.
(3) Nws muaj cov txheej txheem kev kho cua sov zoo. Ntawm qhov kub siab carburizing (900 degree ~ 950 degree), austenite nplej tsis yooj yim rau loj hlob thiab muaj zog hardenability.
3. Cov khoom xyaw yam ntxwv
(1) Cov pa roj carbon tsawg: Cov ntsiab lus carbon feem ntau yog 0.10% mus rau 0.25%, kom qhov nruab nrab ntawm qhov muaj cov yas txaus thiab tawv.
(2) Ntxiv cov ntsiab lus alloy los txhim kho hardenability: Cr, Ni, Mn, B, thiab lwm yam.
(3) Ntxiv cov ntsiab lus uas cuam tshuam txoj kev loj hlob ntawm austenite nplej: feem ntau ntxiv me me ntawm cov muaj zog carbide-forming ntsiab Ti, V, W, Mo, thiab lwm yam.
4.Steel hom thiab qib
20Cr tsawg hardenability alloy carburized hlau. Hom hlau no muaj qhov hardenability tsawg thiab cov tub ntxhais tsis muaj zog.
20CrMnTi nruab nrab hardenability alloy carburizing hlau. Hom hlau no muaj kev ua haujlwm siab, tsis muaj kev kub ntxhov, kev hloov pauv ntawm cov txheej txheem carburizing, thiab cov khoom siv zoo thiab cov txheej txheem.
18Cr2Ni4WA thiab 20Cr2Ni4A siab hardenability alloy carburized steel. Cov hlau no muaj ntau dua Cr, Ni thiab lwm yam khoom, muaj zog hardenability, thiab muaj cov toughness zoo thiab tsis tshua muaj kub cuam tshuam toughness.
5. Kev kho cua sov thiab cov khoom siv
Kev kho cua sov txheej txheem ntawm alloy carburized steel feem ntau quenching ncaj qha tom qab carburizing thiab ces tempering ntawm qhov kub thiab txias. Tom qab kev kho cua sov, cov qauv ntawm cov txheej txheej carburized yog alloy cementite + tempered martensite + ib qho me me ntawm cov austenite khaws cia, nrog lub hardness ntawm 60HRC ~ 62HRC. Cov qauv tseem ceeb muaj feem xyuam rau qhov hardenability ntawm cov hlau thiab qhov sib npaug ntawm qhov loj ntawm qhov. Thaum tag nrho quenched, nws yog tsawg carbon tempered martensite nrog ib tug hardness ntawm 40HRC ~ 48HRC; Feem ntau nws yog troostite, tempered martensite thiab ib qho me me ntawm cov hlau. Lub cev muaj zog muaj zog ntawm 25HRC ~ 40HRC. Lub toughness ntawm cov tub ntxhais feem ntau yog siab tshaj 700KJ / m2.
