Hardness Tus Nqi Ntawm Tungsten Steel Tool lossis Alloy Milling Tool

Hardness yog lub peev xwm ntawm cov khoom siv los tiv thaiv cov khoom tawv uas nias rau hauv nws qhov chaw. Nws yog ib qho tseem ceeb ntawm kev ua tau zoo ntawm cov khoom siv hlau.

Feem ntau, qhov siab dua qhov hardness, qhov zoo dua qhov hnav tsis kam. Feem ntau siv hardness indexes yog Brinell hardness, Rockwell hardness thiab Vickers hardness.

Brinell hardness (HB)

Nias lub pob steel ntawm ib qho me me (feem ntau 10 hli inch) rau hauv cov khoom nto nrog ib qho kev thauj khoom (feem ntau 3000 kg), thiab khaws cia rau ib lub sijhawm. Tom qab unloading, qhov ratio ntawm load rau lub indentation cheeb tsam yog Brinell hardness tooj (HB), thiab chav tsev yog kilogram force / mm2 (n / mm2).

2. Rockwell hardness (HR)

Thaum HB> 450 lossis cov qauv me dhau, Rockwell hardness ntsuas tsis tuaj yeem siv hloov Brinell hardness test. Nws yog lub pob zeb diamond nrog lub kaum sab saum toj ntawm 120 degrees lossis lub pob steel nrog txoj kab uas hla ntawm 1.59 thiab 3.18 hli. Nws yog nias rau hauv qhov chaw ntawm cov khoom nyob rau hauv tej yam load, thiab hardness ntawm cov khoom yog xam los ntawm qhov tob ntawm lub indentation. Raws li qhov sib txawv hardness ntawm cov khoom siv kuaj, nws tuaj yeem qhia los ntawm peb qhov sib txawv:

450 lossis cov qauv me dhau, Rockwell hardness ntsuas tsis tuaj yeem siv hloov Brinell hardness test. Nws yog lub pob zeb diamond nrog lub kaum sab saum toj ntawm 120 degrees lossis lub pob steel nrog txoj kab uas hla ntawm 1.59 thiab 3.18 hli. Nws yog nias rau hauv qhov chaw ntawm cov khoom nyob rau hauv tej yam load, thiab hardness ntawm cov khoom yog xam los ntawm qhov tob ntawm lub indentation. Raws li qhov sib txawv hardness ntawm cov khoom siv kuaj, nws tuaj yeem qhia los ntawm peb qhov sib txawv:

HRA: Lub hardness tau los ntawm 60 kg load thiab pob zeb diamond cone indenter yog siv rau cov ntaub ntawv uas muaj hardness heev (xws li cemented carbide).

HRB: Hardness tau los ntawm hardening ib lub pob steel nrog ib txoj kab uas hla ntawm 1.58 hli thiab ib tug load ntawm 100 kg. Nws yog siv rau cov ntaub ntawv nrog qis hardness.(xws li annealed steel, cam khwb cia hlau, thiab lwm yam).

HRC: Lub hardness tau los ntawm 150 kg load thiab pob zeb diamond cone indenter yog siv rau cov ntaub ntawv uas siab hardness (xws li quenched steel).

3. Vickers hardness (HV)