45 # seamless steel yeeb nkab Hoobkas ncaj muag
45 # seamless steel yeeb nkab tom qab quenching thiab tempering kev kho mob muaj kev zoo txhua yam khoom thiab yog dav siv nyob rau hauv ntau yam tseem ceeb structural qhov chaw, tshwj xeeb tshaj yog cov txuas rods, bolts, zog thiab shafts ua hauj lwm nyob rau hauv alternating load. Txawm li cas los xij, qhov hardness ntawm qhov chaw yog tsawg thiab tsis hnav-resistant. quenching thiab tempering + nto quenching tuaj yeem siv los txhim kho qhov tawv tawv ntawm qhov chaw.
Pom zoo kho cua sov kub: normalizing 850, quenching 840, tempering 600.
45 steel yog cov khoom siv zoo carbon steel nrog tsawg hardness thiab yooj yim txiav. Nws feem ntau yog siv los ua formwork, tua, qhia ncej, thiab lwm yam hauv pwm, tab sis nws yuav tsum tau kho cua sov.
1. 45 steel yog tsim nyog yog tias nws hardness ntau dua HRC55 (txog HRC62) tom qab quenching thiab ua ntej tempering.
Qhov siab tshaj plaws hardness rau kev siv tswv yim yog HRC55 (high zaus quenching hrc58).
2. Cov txheej txheem kev kho cua sov ntawm carburizing thiab quenching yuav tsum tsis txhob siv rau 45 steel.
Cov quenched thiab tempered qhov chaw muaj cov khoom zoo txhua yam thiab tau dav siv nyob rau hauv ntau yam khoom tseem ceeb, tshwj xeeb tshaj yog cov txuas rods, bolts, gears thiab shafts ua hauj lwm nyob rau hauv alternating load. Txawm li cas los xij, qhov hardness ntawm qhov chaw yog tsawg thiab tsis hnav-resistant. quenching thiab tempering + nto quenching tuaj yeem siv los txhim kho qhov tawv tawv ntawm qhov chaw.
Carburizing kev kho mob feem ntau yog siv rau qhov hnyav-lub luag hauj lwm nrog hnav-resistant nto thiab cuam tshuam resistant core, thiab nws hnav tsis kam yog siab tshaj quenching thiab tempering + nto quenching. Cov ntsiab lus carbon saum npoo yog 0.8-1.2%, thiab cov tub ntxhais feem ntau yog 0.1-0.25% (0.35% tshwj xeeb). Tom qab kev kho cua sov, qhov saum npoo tuaj yeem tau txais cov tawv tawv siab (HRC58-62), cov tub ntxhais tsis tshua muaj zog thiab cuam tshuam tsis kam.
Yog hais tias 45 steel yog carburized, nyuaj thiab nkig martensite yuav tshwm nyob rau hauv cov tub ntxhais tom qab quenching, uas yuav poob qhov zoo ntawm carburizing kev kho mob. Cov ntsiab lus carbon ntawm cov ntaub ntawv nrog cov txheej txheem carburizing tsis siab, thiab lub zog tseem ceeb tuaj yeem ncav cuag siab heev ntawm 0.30%, uas tsis tshua muaj nyob rau hauv daim ntawv thov. 0.35% yeej tsis tau pom cov piv txwv, uas tsuas yog qhia hauv phau ntawv. Cov txheej txheem ntawm quenching thiab tempering + siab zaus nto quenching tuaj yeem txais yuav, thiab hnav tsis kam yog me ntsis phem dua li carburizing.
Qhov pom zoo kho cua sov system rau 45 steel teev nyob rau hauv GB / t699-1999 yog 850 ℃ normalizing, 840 ℃ quenching thiab 600 ℃ tempering, thiab lub zog yield yog ≥ 355MPa.
Raws li GB / t699-1999, lub zog tensile ntawm 45 steel yog 600MPa, lub zog tawm los yog 355MPa, qhov elongation yog 16%, qhov txo ntawm cheeb tsam yog 40%, thiab lub zog cuam tshuam yog 39j. 1 、 Muaj nuj nqi, cov yam ntxwv nta thiab kev xav tau ntawm cov ncej ncej
Ncej qhov chaw yog ib qho ntawm cov khoom feem ntau ntsib hauv cov tshuab. Nws yog tsuas yog siv los txhawb qhov kis tau tus mob, kis torque thiab dais load. Ncej qhov chaw yog rotating qhov chaw, nws qhov ntev yog ntau dua li txoj kab uas hla. Lawv feem ntau yog tsim los ntawm sab nrauv cylindrical nto, conical nto, puab lub qhov, xov thiab coj kawg lub ntsej muag ntawm concentric ncej. Raws li cov qauv sib txawv, cov ncej tuaj yeem muab faib ua optical axis, stepped axis, hollow axis thiab crankshaft.
Cov ncej uas muaj qhov sib piv tsawg dua 5 yog hu ua lub ncej luv, thiab lub ncej nrog qhov sib piv ntau dua 20 yog hu ua lub ncej sib luag. Feem ntau shafts yog nruab nrab ntawm ob.
Cov ncej yog txhawb nqa los ntawm cov kabmob, thiab cov ncej txuas nrog cov kabmob yog hu ua phau ntawv sau. Cov ntawv xov xwm yog qhov sib dhos ntawm cov ncej, thiab nws qhov tseeb thiab qhov zoo ntawm qhov chaw feem ntau yuav tsum tau siab. Nws cov kev xav tau yog feem ntau tsim raws li lub luag haujlwm tseem ceeb thiab kev ua haujlwm ntawm cov ncej, feem ntau suav nrog cov khoom hauv qab no:
1.Txhawm rau txiav txim siab txoj haujlwm ntawm cov ncej, cov ntawv xov xwm nrog kev txhawb nqa kev ua haujlwm ntawm qhov tseeb qhov tseeb feem ntau yuav tsum muaj qhov tseeb qhov tseeb (it5 ~ it7). Feem ntau, qhov tseeb qhov tseeb ntawm cov ntawv xov xwm ncej rau kev sib dhos kis tau tus mob tsawg (IT6 ~ it9).
2.Geometric raug qhov tseeb geometric ntawm ncej qhov feem ntau yog hais txog lub roundness thiab cylindricity ntawm phau ntawv journal, txheej lub khob hliav qab, Morse taper qhov, thiab lwm yam. Rau cov npoo sab hauv thiab sab nraud nrog cov kev xav tau siab, qhov kev sib txawv ntawm qhov tso cai yuav tsum raug cim rau ntawm daim duab.
3.Kev sib nrig sib raug zoo txoj hauj lwm qhov yuav tsum tau muaj ntawm ncej qhov chaw yog tsuas yog txiav txim los ntawm txoj hauj lwm thiab kev ua hauj lwm ntawm lub ncej nyob rau hauv lub tshuab. Feem ntau, cov kev cai coaxiality ntawm cov ntawv xov xwm ntawm cov khoom sib txuas sib txuas ntawm cov ntawv xov xwm txhawb nqa yuav tsum tau ua kom ntseeg tau, txwv tsis pub qhov kev sib kis ntawm qhov kis tau tus mob (cov iav, thiab lwm yam) yuav raug cuam tshuam thiab suab nrov yuav raug tsim. Rau qhov zoo tib yam precision shafts, lub radial runout ntawm mating ncej seem rau cov ntaub ntawv txhawb nqa yog feem ntau 0.01 ~ 0.03mm, thiab rau high-precision shafts (xws li lub ntsiab shafts), nws yog feem ntau 0.001 ~ 0.005mm.
4.Qhov saum npoo roughness ntawm txoj kab uas hla ntawm txoj kab uas hla sib phim nrog cov kis tau tus mob yog feem ntau ra2.5 ~ 0.63 μ m. Qhov saum npoo roughness ntawm qhov txhawb nqa txoj kab uas hla sib phim nrog cov kabmob yog Ra0.63 ~ 0.16 μ m.
1.Cov seem ntawm cov ncej. Raws li kev siv cov kev xav tau, hom ntau lawm, cov khoom siv thiab cov qauv, cov ntaub ntawv tsis muaj xws li tuav thiab forgings tuaj yeem xaiv rau cov ncej. Rau cov ncej nrog me ntsis txawv nyob rau hauv lub voj voog sab nraud, nws yog feem ntau dominated los ntawm bar; Rau cov kauj ruam los yog cov shafts tseem ceeb nrog qhov sib txawv loj ntawm lub voj voog sab nraud, forgings feem ntau xaiv, uas tsis tsuas yog txuag cov ntaub ntawv, txo cov haujlwm ntawm machining, tab sis kuj txhim kho cov khoom siv kho tshuab.
Raws li qhov sib txawv ntau lawm, txoj kev forging ntawm qhov dawb paug muaj xws li dawb forging thiab tuag forging. Dawb forging feem ntau yog siv nyob rau hauv me me thiab nruab nrab batch ntau lawm, thiab tuag forging yog siv nyob rau hauv loj ntau lawm.
2. Cov ntaub ntawv ntawm cov ncej ncej yuav tsum xaiv cov khoom sib txawv raws li kev ua haujlwm sib txawv thiab siv cov kev xav tau thiab txais cov kev kho cua sov sib txawv (xws li quenching thiab tempering, normalizing, quenching, thiab lwm yam) kom tau txais qee lub zog, toughness thiab hnav tsis kam.
45 steel yog ib qho khoom siv rau cov ncej ncej. Nws yog pheej yig. Tom qab quenching thiab tempering (lossis normalizing), nws tuaj yeem tau txais kev ua haujlwm zoo dua, lub zog siab thiab tawv thiab lwm yam khoom siv dav dav. Lub hardness saum npoo tom qab quenching tuaj yeem ncav cuag 45 ~ 52hrc.
40Cr thiab lwm yam alloy steels yog tsim rau cov ncej nrog nruab nrab precision thiab siab ceev. Tom qab quenching, tempering thiab quenching, hom hlau no muaj cov khoom zoo txhua yam.
Cov kabmob steel GCr15 thiab lub caij nplooj ntoos hlav steel 65Mn, tom qab quenching thiab tempering thiab nto high-frequency quenching, lub deg hardness tuaj yeem ncav cuag 50 ~ 58hrc, thiab muaj kev qaug zog thiab hnav tsis kam. Lawv tuaj yeem tsim cov ncej siab.
38crmoaia nitrided steel tuaj yeem raug xaiv rau lub spindle ntawm precision tshuab cuab yeej (xws li grinder xuab zeb qag thiab tswj kev tho txawv tshuab spindle). Tom qab quenching thiab tempering thiab nto nitriding, cov hlau no tuaj yeem tsis tsuas yog tau txais qhov siab ntawm qhov tawv, tab sis kuj muaj cov tub ntxhais mos mos, yog li nws muaj kev cuam tshuam zoo. Piv nrog carburized quenched steel, nws muaj cov yam ntxwv ntawm kev kho cua sov me me deformation thiab hardness dua.
45 steel yog siv dav hauv kev tsim khoom. Cov hlau no muaj cov khoom siv zoo. Txawm li cas los xij, qhov no yog qhov nruab nrab carbon steel nrog kev ua haujlwm tsis zoo. No. 45 steel tuaj yeem hardened rau hrc42 ~ 46. Yog li ntawd, yog hais tias qhov saum npoo hardness yuav tsum tau thiab lub superior mechanical zog ntawm 45 # steel yuav tsum tau coj mus rau hauv kev ua si, nto ntawm 45 # steel feem ntau carburized thiab quenched, yog li ntawd. uas yuav tsum tau deg hardness yuav tau.
