Brinell Vs Rockwell Hardness Testing Comparison

Kev ntsuam xyuas hardness yog txheej txheem tseem ceeb rau kev ntsuam xyuas cov khoom siv ntawm cov khoom siv hlau. Ntawm ntau txoj hauv kev muaj, Brinell thiab Rockwell hardness tests yog ob qho kev pom zoo tshaj plaws hauv kev lag luam thoob ntiaj teb. Txhua txoj hauv kev tau tsim los daws cov kev xav tau tshwj xeeb, thiab nkag siab txog lawv qhov sib txawv yog qhov tseem ceeb rau kev xaiv qhov tsim nyog tshaj plaws rau koj daim ntawv thov. Phau ntawv qhia no muab kev sib piv ntawm Brinell thiab Rockwell hardness test method, nrog rau lawv cov qauv kev ua haujlwm, qhov sib txawv tseem ceeb, qhov zoo thiab cov kev txwv, thiab cov kev taw qhia siv rau kev xaiv txoj kev.

Txoj kev Brinell

Brinell hardness test, npaj los ntawm Swedish engineer Johan August Brinell nyob rau hauv 1900, yog thawj txheej txheem hardness xeem txoj kev. Qhov kev ntsuam xyuas siv lub voj voos kheej kheej- feem ntau yog ib lub pob tungsten carbide ntawm txoj kab uas hla (feem ntau 10mm)- uas yog nias rau hauv cov khoom nto raws li lub zog ntsuas. Tom qab lub load yog tuav rau lub sij hawm nyob rau hauv lub sij hawm thiab ces tshem tawm, lub cheeb ntawm lub resulting indentation yog ntsuas optically, feem ntau nyob rau hauv tsawg kawg yog ob perpendicular cov lus qhia. Tus nqi Brinell hardness yog xam raws li qhov siv zog thiab qhov nkhaus ntawm qhov chaw ntawm qhov indentation.

Vim hais tias txoj kev Brinell tsim ib qho loj indentation, qhov tshwm sim nruab nrab ntawm cov khoom hardness nyob rau hauv ib cheeb tsam dav. Qhov no ua rau qhov kev ntsuam xyuas tshwj xeeb yog tsim rau cov ntaub ntawv nrog ntxhib lossis tsis yog - homogeneous grain qauv, xws li castings thiab forgings.

Txoj Kev Rockwell

Rockwell hardness test, tsim nyob rau hauv thaum ntxov 20th caug xyoo los ntawm Hugh thiab Stanley Rockwell, ntsuas hardness raws li qhov tob ntawm indentation es nws txoj kab uas hla. Qhov kev sim siv ob -theem loading txheej txheem: ib tug me me loading (feem ntau 10 kgf rau standard Rockwell scales) yog thawj zaug siv rau lub rooj zaum lub indenter thiab tsim ib tug siv txoj hauj lwm; ib qho loj load yog ntxiv, tsav lub indenter ntxaum rau hauv cov khoom. Tom qab qhov kev thauj khoom loj raug tshem tawm thaum lub thauj me me tau khaws cia, qhov nce hauv qhov tob tob yog ntsuas thiab hloov ncaj qha rau hauv Rockwell hardness tooj. Txoj kev Rockwell tsis tas yuav ntsuas qhov muag pom, thiab qhov tseem ceeb ntawm qhov hardness yuav tshwm sim tam sim ntawd thaum ua tiav.

Thaum Xaiv Brinell Test

Brinell hardness testing yog tshwj xeeb tshaj yog tsim nyog rau kev ntsuam xyuas loj, hnyav, los yog ntxhib-cov khoom xyaw uas muaj qhov tsis sib xws ntawm qhov chaw yuav ua rau muaj kev cuam tshuam cov txiaj ntsig kev xeem. Cov ntawv thov ib txwm muaj xws li:

• Castings thiab forgings: Qhov loj indentation nruab nrab tawm ntawm microstructural variations, muab ib tug tseeb sawv cev ntawm tej khoom vaj tse.
• Rough- cov ntaub ntawv ntog: Brinell kuaj yog tiv thaiv kom tsis txhob muaj cov kab mob me me thiab ua kom tiav, txo lub sijhawm npaj.
• Foundries thiab steel mills: Brinell hardness tester yog tus qauv cuab yeej los xyuas qhov hardness ntawm kub- dov daim hlau, cov khoom seem, thiab quenched-thiab- tempered steel.
• Kev lag luam roj thiab roj: Portable Brinell testers pab tau rau ntawm -qhov kev txheeb xyuas qhov nyuaj ntawm cov kav dej, cov khoom siv tho, thiab cov txheej txheem tseem ceeb, txhawb kev nyab xeeb thiab kev ua raws cai.

Thaum Xaiv Rockwell Testing

Rockwell hardness testing yog txoj kev nyiam rau siab - ntim ntau lawm ib puag ncig uas ceev thiab kev ua tau zoo yog qhov tseem ceeb. Cov ntawv thov ib txwm muaj xws li:

• Cov kab ntau lawm: Qhov kev ntsuam xyuas muab kev nyeem cov tawv tawv tam sim ntawd hauv vib nas this, ua kom muaj kev hloov pauv ntawm - lub sijhawm.
• Thaum tshav kub kub- cov khoom siv kho mob: HRC yog qhov ntsuas ntau tshaj plaws rau kev txheeb xyuas qhov nyuaj ntawm quenched thiab tempered steels, cuab yeej steel, thiab bearing steels.
• Tiav lawm lossis ib nrab- cov khoom tiav: Cov ntawv me me ua rau Rockwell kev sim ua tau zoo tsis yog- puas tsuaj rau feem ntau cov khoom.
• Kev tswj xyuas zoo ntawm cov khoom siv tawv tawv: Tsis zoo li Brinell, Rockwell tuaj yeem siv rau ntawm cov hlau tsis muaj zog tsis muaj kev pheej hmoo ntawm kev puas tsuaj.

Kev xaiv ntawm Brinell thiab Rockwell hardness test method feem ntau nyob ntawm cov khoom siv thiab cov hom phiaj kev xeem. Raws li kev xyaum ua lag luam, kev sim Brinell tseem yog qhov tseem ceeb rau cov khoom ntxhib-cov ntaub ntawv nyoos thiab cov khoom sib txawv uas yuav tsum muaj cov neeg sawv cev nruab nrab hardness. Brinell hardness tester yog dav siv nyob rau hauv foundries, forges, thiab steel mills vim hais tias nws loj indentation muab cov ntsiab lus uas tsis tshua muaj cuam tshuam los ntawm lub zos variations nyob rau hauv grain qauv los yog nto. Conversely, Rockwell xeem dominates ntau lawm pem teb zoo tswj vim nws ceev, ncaj qha nyeem ntawv, thiab tsawg tsawg tus qauv npaj. Ntau qhov chaw tsim khoom muaj ob hom khoom siv los npog tag nrho cov khoom siv thiab kev siv tau ntsib hauv lawv txoj haujlwm.

Xaiv txoj kev tsis raug rau cov khoom siv

Ib qho yuam kev feem ntau yog siv Rockwell kev ntsuam xyuas ntawm ntxhib castings qhov chaw qhov tsis sib xws ua rau kev nyeem tsis raug, lossis siv Brinell ntawm cov ntaub ntawv nyias lossis cov tawv tawv uas qhov loj indentation tuaj yeem nkag mus rau hauv cov qauv lossis ua rau cov khoom puas. Kev nkag siab txog cov yam ntxwv ntawm cov khoom siv- cov qauv nplej, tuab, thiab qhov xav tau hardness ntau yam - yog qhov tseem ceeb rau txoj kev xaiv.

Ignoring Sample Thickness Requirements

Brinell indentations yog qhov sib sib zog nqus. Raws li ISO 6506 thiab ASTM E10, cov qauv thickness yuav tsum yog tsawg kawg yog yim npaug ntawm qhov tob indentation. Kev ntsuam xyuas cov ntaub ntawv nyias ntawm Brinell tester yam tsis tau txheeb xyuas qhov xav tau tuab yuav ua rau cov txiaj ntsig tsis raug. Kev kuaj Rockwell feem ntau yog tsim nyog rau nyias lossis me me.

Overlooking Calibration Xav Tau

Ob txoj kev yuav tsum tau calibration tsis tu ncua siv ntawv pov thawj siv hardness blocks. Kev txheeb xyuas txhua hnub raug pom zoo rau qhov siab - ntim ntau lawm ib puag ncig, thiab kev ntsuas tag nrho los ntawm chav kuaj pom zoo feem ntau yuav tsum tau ua txhua xyoo lossis raws li tau teev tseg los ntawm cov txheej txheem tswj kom zoo.

Q1: Txoj kev twg yog qhov tseeb dua?

Rau cov ntaub ntawv ntxhib los yog heterogeneous, Brinell muab cov txiaj ntsig zoo dua thiab cov neeg sawv cev vim tias qhov loj me me nruab nrab ntawm qhov sib txawv ntawm microstructural. Rau cov ntaub ntawv tsis sib xws, ob txoj hauv kev muab qhov tseeb zoo thaum ntsuas kom raug, nrog Rockwell feem ntau muab cov txiaj ntsig sai dua.

Q2: Txoj kev twg sai dua?

Kev kuaj Rockwell yog qhov nrawm dua. Cov txiaj ntsig tau tshwm sim ncaj qha hauv vib nas this tom qab ua tiav qhov kev xeem, tsis tas yuav tsum tau ntsuas qhov muag. Kev kuaj Brinell yuav tsum ntsuas lub cheeb ntawm indentation nrog lub tshuab tsom iav lossis kho qhov muag, uas ntxiv sijhawm rau lub voj voog ntsuas.

Q3: Ob txoj kev tuaj yeem siv ua ke?

Yog lawm. Ntau qhov chaw tsim khoom siv ob qho tib si Brinell thiab Rockwell testers los npog ntau yam khoom siv thiab kev siv. Piv txwv li, lub foundry yuav siv Brinell rau cov khoom nyoos tuaj thiab Rockwell rau cov khoom tiav.

Q4: Qhov txawv ntawm HBW thiab HRC yog dab tsi?

HBW (Brinell hardness siv lub tungsten carbide pob) ntsuas lub cheeb ntawm ib tug kheej kheej indentation thiab qhia nyob rau hauv units ntawm quab yuam ib cheeb tsam. HRC (Rockwell C scale) ntsuas qhov tob ntawm kev nkag mus ntawm lub pob zeb diamond cone indenter thiab tau hais tawm ntawm qhov ntsuas tsis muaj qhov ntsuas. Ob txoj hauv kev tsis tuaj yeem hloov pauv ncaj qha yam tsis muaj cov khoom siv - cov ntaub ntawv sib txuas tshwj xeeb.

Ob qho tib si Brinell thiab Rockwell hardness kuaj txoj kev muaj qhov zoo sib xws uas ua rau lawv haum rau kev siv sib txawv. Brinell hardness tester yog qhov kev xaiv zoo tshaj plaws rau ntxhib-cov khoom hnyav, cov khoom sib txawv xws li castings thiab forgings, qhov twg nws qhov loj indentation muab tus sawv cev nruab nrab hardness tus nqi. Kev ntsuam xyuas Rockwell yog qhov zoo tshaj plaws rau siab - ntim ntau lawm ib puag ncig, hardened steels, thiab cov khoom tiav, muab cov txiaj ntsig sai nrog kev npaj tsawg kawg nkaus. Kev nkag siab txog qhov sib txawv no ua rau cov kws tshaj lij tswj kev ua haujlwm tau zoo los xaiv txoj hauv kev tsim nyog tshaj plaws rau lawv cov kev xav tau tshwj xeeb, txhim kho kev sim ua kom zoo thiab ua kom ntseeg tau cov ntaub ntawv pov thawj txhim khu kev qha.

 Rau cov kws tshaj lij kev taw qhia txog kev xaiv cov kev sim hardness zoo rau koj daim ntawv thov, thov hu rau peb hnub no.