CBIES AUTOMOTIVE|Test Method for Heat Treatment Hardness
Cov txheej txheem hardening yog txheej txheem tseem ceeb heev hauv cov txheej txheem tsim tsheb, thiab cov chaw tsim khoom ntawm cov khoom yuav tsum ua kom muaj kev ruaj ntseg zoo ntawm nws cov khoom. Nws yog qhov paub zoo tias cov txheej txheem hardening yog ib qho tseem ceeb ntawm kev ntxiv dag zog rau cov ntaub ntawv steel, thiabCBIES AUTOMOTIVEsiv cov txheej txheem no feem ntau rau covFasteners. Cov txheej txheem quenching belongs rau kev kho cua sov saum npoo, yog li peb yuav ua li cas kuaj qhov hardness ntawm kev kho cua sov?
Kev kho cua sov saum npoo yog muab faib ua ob pawg, ib qho yog deg quenching thiab tempering tshav kub kho, thiab lwm yam yog tshuaj kho cua sov, cov hauv qab no yog kom nkag siab txog cov txheej txheem ntawm kev sim hardness feem.
A. Nto quenching thiab tempering kub kho
Deg quenching thiab tempering cua sov kho feem ntau yog ua los ntawm induction cua sov los yog nplaim hluav taws kub. Lub ntsiab technical parameters yog deg hardness, lub zos hardness, thiab zoo hardening txheej tob. Kev ntsuas hardness tuaj yeem siv Vickers hardness tester, tab sis kuj tuaj yeem siv Rockwell lossis nto Rockwell hardness tester. Qhov kev xaiv ntawm kev xeem quab yuam (scale) muaj feem xyuam rau cov txheej txheem hardening qhov tob thiab qhov hardness ntawm lub workpiece. Peb hom hardness testers koom nrog ntawm no.
Vickers hardness tester yog ib qho tseem ceeb ntawm kev ntsuam xyuas qhov hardness ntawm lub tshav kub kho workpiece, nws muaj peev xwm xaiv tau los ntawm {{0}}.5 mus rau 100 kg ntawm kev xeem quab yuam, ntsuam xyuas cov saum npoo hardening txheej raws li nyias li 0.05 mm tuab, nws qhov tseeb yog qhov siab tshaj plaws, tuaj yeem paub qhov txawv me me ntawm qhov tawv tawv ntawm qhov kev kho cua sov workpiece. Tsis tas li ntawd, cov txheej txheem hardening qhov tob kuj tseem yuav raug kuaj xyuas los ntawm Vickers hardness tester, yog li rau kev kho cua sov saum npoo los yog ntau chav nyob siv cov khoom siv kho cua sov saum npoo, nruab nrog Vickers hardness tester yog tsim nyog.
Qhov saum npoo Rockwell hardness tester kuj yog qhov tsim nyog rau kev ntsuam xyuas qhov nyuaj ntawm qhov chaw ua haujlwm nyuaj. Qhov saum npoo Rockwell hardness tester muaj peb teev xaiv los ntawm. Nws tuaj yeem sim ntau yam ntawm cov khoom ua haujlwm tawv tawv nrog qhov tob tob ntawm ntau tshaj 0.1 hli. Txawm hais tias qhov tseeb ntawm qhov chaw Rockwell hardness tester tsis siab npaum li Vickers hardness tester, raws li kev kho cua sov cog kev tswj kom zoo thiab kev soj ntsuam kev tsim nyog txhais tau tias, muaj peev xwm ua tau raws li qhov yuav tsum tau ua. Tsis tas li ntawd, nws kuj muaj cov yam ntxwv ntawm kev ua haujlwm yooj yim, siv tau yooj yim, tus nqi qis, ntsuas nrawm, nyeem ncaj qha ntawm tus nqi hardness, thiab lwm yam. Kev siv lub ntsej muag Rockwell hardness tester tuaj yeem siv tau sai thiab tsis muaj kev puas tsuaj ib puag ncig. kuaj ntawm batches ntawm nto tshav kub kho workpieces. Qhov no yog ib qho tseem ceeb heev rau cov hlau ua thiab machinery manufacturing nroj tsuag.
Thaum tshav kub kub kho hardening txheej yog tuab, kuj siv tau Rockwell hardness tester. Thaum lub thickness ntawm kev kho cua sov hardened txheej yog {{0}}.4 mus rau 0.8mm, HRA nplai yuav siv tau, thiab thaum lub thickness ntawm hardened txheej tshaj 0.8mm, lub HRC nplai tuaj yeem siv tau.
B. Kev kho cua sov
Kev kho cua sov yog ua kom lub ntsej muag ntawm lub workpiece infiltrated nrog atoms ntawm ib los yog ob peb yam tshuaj, yog li hloov cov tshuaj muaj pes tsawg leeg, koom haum, thiab cov khoom ntawm lub workpiece nto. Tom qab quenching thiab low-temperature tempering, qhov saum npoo ntawm lub workpiece muaj siab hardness, hnav tsis kam, thiab tiv taus qaug zog, thaum lub hauv paus ntawm lub workpiece muaj siab toughness.
Cov txheej txheem tseem ceeb ntawm cov khoom siv hluav taws xob kho cua sov yog qhov tob ntawm txheej tawv tawv thiab qhov tawv tawv. Qhov tob ntawm txheej hardened tseem yuav raug kuaj los ntawm Vickers hardness tester. Tshawb xyuas qhov kev ncua deb ntawm qhov chaw ntawm lub workpiece mus rau qhov chaw uas lub hardness poob mus rau 50 HRC. Qhov no yog qhov zoo hardening qhov tob.
Tshuaj kho cua sov workpiece nto hardness nrhiav kom tau thiab nto quenching tshav kub kev kho mob workpiece hardness nrhiav kom tau zoo ib yam, siv tau Vickers hardness tester, nto Rockwell hardness tester, los yog Rockwell hardness tester los xyuas, tsuas yog lub thickness ntawm nitriding thickness yog nyias, feem ntau tsis ntau tshaj. 0.7mm, tom qab ntawd koj tsis tuaj yeem siv Rockwell hardness tester lawm.
C. Kev kho cua sov hauv zos
Cov khoom uas muaj qhov xav tau hardness siab hauv zos, xws li cov cua sov induction tuaj yeem siv rau hauv zos quenching tshav kub kev kho mob, xws li cov khoom feem ntau yuav tsum tau muab cim rau ntawm qhov chaw ntawm lub zos quenching tshav kub kho thiab lub zos hardness qhov tseem ceeb. Ib feem ntawm qhov kev ntsuam xyuas hardness yuav tsum tau ua nyob rau hauv lub cheeb tsam. Lub hardness kuaj ntsuas yuav siv tau Rockwell hardness tester, kuaj HRC hardness nqi, xws li cov tshav kub kho hardening txheej nyob rau hauv ntiav, siv tau nto Rockwell hardness tester, kuaj HRN hardness nqi.
