Qhov feem ntau dav siv nyob rau hauv kev tsim khoom yog lub hardness ntawm xovxwm-hauv txoj kev, xws li brinell hardness, rockwell hardness, vickers hardness thiab micro hardness. Cov tau txais lub hardness nqi yeej tseem ceeb sawv cev rau cov hlau tawm rau cov yas deformation tshwm sim los ntawm kev nkag los ntawm cov khoom txawv teb chaws.
Cov hauv qab no yog qhia luv luv rau cov chav hardness ntau:
1. Brinell Hardness (HB)
Nias lub pob zeb tawv tawv ntawm qee qhov loj me (feem ntau 10mm hauv cov cheeb tsam) mus rau saum npoo ntawm cov khoom siv (feem ntau 3000kg) thiab khaws cia rau lub sijhawm. Tom qab lub nra raug tshem tawm, qhov sib piv ntawm lub nra rau qhov chaw indentation yog lub brinell hardness tus nqi (Mil) Force / MM2 (N / MM2).
2. Rockwell Hardness (HR)
Thaum HB> 450 lossis tus qauv me me dhau, brinell hardness kuaj tsis tuaj yeem siv thiab rockwell hardness yuav tsum siv xwb. Nws siv lub pob zeb diamond cone nrog lub kaum sab xis ntawm 120 ° lossis lub cheeb tsam ntawm cov khoom siv ntawm 1.59 ntawm cov khoom siv tau los ntawm qhov tob ntawm indentation. Raws li qhov nyuaj ntawm cov khoom ntsuas, nws tuaj yeem hais tawm hauv peb qhov sib txawv sib txawv:
HRA: Nws yog lub hardness tau los ntawm kev siv 60kg load thiab pob zeb diamond iav indenter, thiab yog siv rau cov khoom siv nyuaj (xws li mob carbide, thiab lwm yam).
HRB: Nws yog lub hardness tau los ntawm kev siv 100kg thauj khoom thiab lub pob zeb tawv tawv hlau nrog txoj kab uas hla ntawm 1.58mm. Nws yog siv rau cov ntaub ntawv nrog qis dua hardness (xws li annealed steel, cam khwb cia hlau, thiab lwm yam).
HRC: Nws yog lub hardness tau los ntawm kev siv 150kg load thiab pob zeb diamond iav indenter, thiab yog siv rau cov khoom siv tawv (xws li cov hlau tawv (thiab lwm yam).
3 Vickers Hardness (HV)
Siv lub pob zeb diamond square indenter nrog lub nra tsawg dua 120kg thiab faib cov khoom ntawm cov khoom, thiab faib cov khoom muaj nqis hv tus nqi (KGF / MM2).
Piv nrog brinell thiab rockwell hardness chantess, vickers hardness ntsuas muaj ntau yam zoo. Nws tsis muaj cov kev txwv ntawm cov kev cai tshwj xeeb ntawm load P thiab Indenter Inch d zoo li brinell, thiab qhov teeb meem ntawm deformation ntawm indenter; Tsis yog nws muaj qhov teeb meem uas lub hardness nqi ntawm rockwell tsis tuaj yeem sib koom tes. Thiab nws tuaj yeem sim cov ntaub ntawv muag muag thiab cov khoom tawv zoo li rockwell, thiab nyias txheej) zoo dua li rockwell, uas tuaj yeem tsuas yog ua los ntawm rockwell nto hardness. Tab sis txawm nyob hauv cov xwm txheej zoo li no, nws tsuas yog muab piv rau hauv kev sib tw foob pob zeb, thiab tsis tuaj yeem sib koom ua ke nrog lwm qib nyuaj. Ib qho ntxiv, vim tias Rockwell siv qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas qis dua qhov dav dav, yog li nws qhov kev txheeb ze yog qhov loj dua. Yog li ntawd, lub rockwell hardness cov ntaub ntawv tsis yog ruaj raws li brinell thiab vickers, thiab tau kawg tsis yog ruaj khov raws li vickers precision.
Muaj ib qho kev sib raug zoo ntawm Brinell, Rockwell thiab Vickers, thiab muaj kev sib raug zoo ntawm cov lus uas tuaj yeem ua kom tau tiav.
Lub sijhawm Post: Mar-16-2023
