(1) Qhov sib txawv tseem ceeb ntawm cov khoom siv hlau siv rau cov saw hlau hauv tsev thiab txawv teb chaws yog nyob rau hauv cov saw hlau sab hauv thiab sab nrauv.Kev ua tau zoo ntawm cov saw phaj yuav tsum muaj lub zog tensile siab thiab qee qhov toughness.Hauv Suav teb, 40Mn thiab 45Mn feem ntau yog siv rau kev tsim khoom, thiab 35 steel tsis tshua siv.Cov tshuaj muaj pes tsawg leeg ntawm 40Mn thiab 45Mn steel daim hlau yog dav dua li ntawm txawv teb chaws S35C thiab SAEl035 steels, thiab muaj 1.5% mus rau 2.5% thickness decarburization ntawm qhov chaw.Yog li ntawd, cov saw phaj feem ntau raug kev txom nyem los ntawm nkig tawg tom qab quenching thiab txaus tempering.
Thaum lub sij hawm sim hardness, qhov hardness ntawm cov saw phaj tom qab quenching yog tsawg (tsawg dua 40HRC).Yog hais tias ib tug tej thickness ntawm txheej txheej yog hnav, lub hardness yuav ncav cuag ntau tshaj 50HRC, uas yuav cuam tshuam rau qhov tsawg kawg nkaus tensile load ntawm cov saw.
(2) Cov tuam txhab txawv teb chaws feem ntau siv S35C thiab SAEl035, thiab siv cov khoom siv hluav taws xob txuas ntxiv txuas ntxiv.Thaum lub sij hawm kho cua sov, ib qho chaw tiv thaiv yog siv los kho recarburization.Tsis tas li ntawd, kev tswj xyuas nruj ntawm qhov chaw yog siv, yog li cov saw hlau tsis tshua muaj tshwm sim.Tom qab quenching thiab tempering, brittle puas los yog tsawg nto hardness tshwm sim.
Metallographic kev soj ntsuam qhia tau hais tias muaj ntau npaum li cas zoo koob zoo li martensite qauv (kwv yees 15-30um) nyob rau saum npoo ntawm cov saw phaj tom qab quenching, thaum cov tub ntxhais yog strip-zoo li martensite qauv.Nyob rau hauv cov xwm txheej ntawm tib lub saw phaj tuab, qhov tsawg kawg nkaus tensile load tom qab tempering yog loj dua li ntawm cov khoom siv hauv tsev.Nyob rau hauv txawv teb chaws, 1.5 hli tuab daim hlau feem ntau yog siv thiab lub zog tensile uas yuav tsum tau yog> 18 kN, thaum cov chains hauv tsev feem ntau siv 1.6-1.7 hli tuab daim hlau thiab qhov yuav tsum tau tensile quab yuam yog> 17.8 kN.
(3) Vim qhov kev txhim kho tas mus li ntawm qhov yuav tsum tau ua rau cov saw hlau maus taus, cov tuam txhab tsim khoom hauv tsev thiab txawv teb chaws txuas ntxiv txhim kho cov hlau siv rau cov pins, lub tes tsho thiab cov menyuam.Qhov tsawg kawg nkaus tensile load thiab tshwj xeeb tshaj yog hnav tsis kam ntawm cov saw muaj feem xyuam rau cov hlau.Tom qab cov tuam txhab tsim khoom hauv tsev thiab txawv teb chaws tsis ntev los no tau xaiv 20CrMnTiH hlau ua cov khoom siv tus pin hloov 20CrMnMo, cov saw tensile load tau nce 13% mus rau 18%, thiab cov tuam txhab txawv teb chaws siv SAE8620 steel ua tus pin thiab lub tes tsho khoom.Qhov no kuj muaj feem xyuam rau qhov no.Kev xyaum tau pom tias tsuas yog los ntawm kev txhim kho qhov sib txawv ntawm tus pin thiab lub tes tsho, kev txhim kho cov txheej txheem kev kho cua sov thiab lubrication, tuaj yeem hnav tsis kam thiab tensile load ntawm cov saw yuav zoo tuaj.
(4) Nyob rau hauv lub maus taus saw qhov chaw, lub puab txuas phaj thiab lub tes tsho, sab nrauv txuas phaj thiab tus pin yog tag nrho tsau ua ke nrog ib tug cuam tshuam haum, thaum tus pin thiab lub tes tsho yog ib tug clearance haum.Qhov haum ntawm cov saw hlau muaj qhov cuam tshuam zoo rau kev hnav tsis kam thiab qhov tsawg kawg nkaus tensile load ntawm cov saw.Raws li qhov sib txawv siv sijhawm thiab kev puas tsuaj ntawm cov saw hlau, nws tau muab faib ua peb theem: A, B thiab C. Chav A yog siv rau kev ua haujlwm hnyav, kev kub ceev thiab kev sib kis tseem ceeb;Chav B yog siv rau kev sib kis dav dav;Class C yog siv rau kev hloov cov iav zoo tib yam.Yog li ntawd, kev sib koom ua ke ntawm Class A chain parts yog nruj dua.
Post lub sij hawm: Sep-08-2023