I. Rockwell Hardness (HR)
Txoj Cai Siv lub pob zeb diamond lub khob hliav qab nrog lub kaum sab xis ntawm 120 degrees los yog lub pob steel ntawm 1.59mm lossis 3.18mm txoj kab uas hla raws li lub indenter. Siv thawj zaug load thiab lub ntsiab load rau indent cov khoom nto. Xam tus nqi hardness raws li qhov tob indentation. Deeper indentation txhais tau tias qis hardness nqi.
Yam ntxwv:
Kev sim sai thiab ua haujlwm yooj yim, haum rau kev tshuaj xyuas batch.
Muaj peev xwm kuaj cov khoom nruab nrab mus rau siab hardness.
Ntau qhov ntsuas raws li cov khoom siv hardness:
HRA: 60kg load nrog pob zeb diamond indenter, rau ultra- cov ntaub ntawv nyuaj xws li cemented carbide.
HRB: 100kg load nrog steel pob indenter, rau me me hlau, tooj liab alloys, txhuas alloys.
HRC: 150kg load nrog pob zeb diamond indenter, rau quenched steel, siab -hardness alloys.
Daim Ntawv Thov Kev Siv Dav Dav siv rau kev soj ntsuam ceev ceev ntawm cov khoom hlau xws li cov cuab yeej txiav, bearings, zog, thiab cam khwb cia hlau qhov chaw.
II. Brinell Hardness (HBW)
Txoj Cai Siv lub pob tawv tawv feem ntau ntawm 10mm txoj kab uas hla mus rau qhov chaw ntawm cov khoom siv raws li qhov teev tseg. Xam tus nqi hardness raws li indentation diameter.Common hom:
HBS: steel pob indenter, rau cov ntaub ntawv uas hardness tsawg dua los yog sib npaug li 450 HB xws li me me steel, grey cam khwb cia hlau, tsis yog -ferrous hlau.
HBW: Hard alloy pob indenter, rau cov ntaub ntawv nrog hardness tsawg dua los yog sib npaug rau 650 HB, cov qauv tseem ceeb ntawm cov qauv niaj hnub.
Yam ntxwv:
Cov txiaj ntsig ruaj khov thiab rov ua tau zoo.
Haum rau cov mos mus rau nruab nrab hardness hlau.
Loj indentation, tsis haum rau nyias -walled los yog me me qhov chaw.
Cov ntawv thov Hardness kuaj cov ntaub ntawv raw thiab cov khoom siv ntxhib xws li annealed steel, cam khwb cia hlau, tsis yog -ferrous hlau thiab lawv cov alloys.
III. Vickers Hardness (HV)
Lub hauv paus ntsiab lus Siv lub square pyramid pob zeb diamond indenter nrog lub kaum sab xis ntawm 136 degrees. Indents cov khoom nto nyob rau hauv lub load. Xam tus nqi hardness raws li indentation diagonal length.
Yam ntxwv:
High precision, muaj peev xwm ntawm kev sim cov cheeb tsam me me.
Kev siv dav dav, los ntawm cov hlau mos mus rau ultra- cov ntaub ntawv nyuaj.
Qhov tsawg kawg nkaus indentation, haum rau nyias- ntu ntu, txheej, thiab micro- kuaj cheeb tsam.
Cov ntawv thov Hardness kuaj ntawm precision qhov chaw, txheej, thiab nyias daim hlau xws li xov tooj ntawm tes plhaub txheej. Kuj tseem siv rau micro-thaj chaw hardness tsom xam xws li lis ciam teb thiab theem ciam teb hauv kev tshawb fawb.
IV.Cov lus qhia rau kev sim xaiv txoj kev xaiv
Ntau qhov chaw thiab batch tshuaj xyuas: Xaiv Rockwell Hardness.
Cov ntaub ntawv nyoos thiab cov kev xav tau siab: Xaiv Brinell Hardness.
Txheej, micro- thaj chaw, thiab kev tshawb fawb tshawb fawb: Xaiv Vickers Hardness.
V. Summary
Peb txoj kev sim hardness txhua tus muaj qhov zoo. Kev xaiv yuav tsum yog raws li kev txiav txim siab ntawm cov khoom siv, cov qauv qauv, ntau yam hardness thiab precision yuav tsum tau ua kom tau txais txiaj ntsig zoo tshaj plaws.
