Kev ntsuam xyuas hardness yog ib qho yooj yim tshaj plaws thiab yooj yim tshaj plaws muaj nyob rau hauv kev ntsuam xyuas cov cuab yeej cuab tam. Txhawm rau hloov qee qhov kev ntsuam xyuas cov cuab yeej cuab tam nrog kev sim hardness, qhov kev hloov pauv hloov tau zoo ntawm qhov nyuaj thiab lub zog yog xav tau hauv kev tsim khoom.
1. Brinell Hardness (HB): Lub pob steel tawv ntawm ib qho me me (feem ntau yog 10mm inch) yog nias rau hauv cov khoom nto nyob rau hauv ib qho kev thauj khoom (feem ntau 3000kg). Tom qab ib lub sij hawm, qhov piv ntawm cov load rau cheeb tsam ntawm lub indentation yog Brinell hardness nqi (HB), qhia nyob rau hauv kgf / mm² (N / mm²).
2. Rockwell Hardness (HR): Thaum HB> 450 lossis cov qauv me dhau, Brinell hardness test tsis tuaj yeem siv, thiab Rockwell hardness ntsuas yog siv los hloov. Nws siv lub pob zeb diamond lub khob hliav qab nrog 120℃apex lub kaum sab xis lossis lub pob steel nrog txoj kab uas hla ntawm 1.59 lossis 3.18mm, nias rau hauv qhov chaw ntawm cov khoom nyob rau hauv ib qho kev thauj khoom. Lub hardness ntawm cov khoom yog txiav txim los ntawm qhov tob ntawm indentation. Nyob ntawm qhov hardness ntawm cov khoom siv kuaj, muaj peb qhov sib txawv:
HRA: Hardness tau siv 60kg load thiab pob zeb diamond cone indenter; siv rau cov ntaub ntawv uas tsis tshua muaj siab hardness (xws li cemented carbide).
HRB: Hardness tau siv 100kg load thiab 1.58mm inch hardened steel pob; siv rau cov ntaub ntawv uas tsis tshua muaj hardness (xws li annealed steel thiab cam khwb cia hlau).
HRC: Hardness tau siv 150kg load thiab pob zeb diamond cone indenter; siv rau cov ntaub ntawv uas siab heev hardness.
3. Vickers Hardness (HV): Lub pob zeb diamond square cone indenter nrog 136℃apex lub kaum sab xis yog nias rau hauv cov khoom nto hauv qab qhov hnyav txog li 120kg. Vickers hardness tus nqi (HV) yog tau los ntawm kev faib cov nqi thauj khoom los ntawm thaj tsam ntawm qhov indentation.
