Dab tsi yog rockwell hardness (HR)
Siv lub pob zeb diamond cone lossis quenched steel lub khob lub ntsej muag ntawm 12kgf thiab nias lub zog ntawm 10, 100, lossis 150 (IE thawj lub zog ntxiv lub nra ). Tom qab tag nrho cov kev thauj khoom yog thov, lub hardness yog qhia los ntawm qhov sib txawv ntawm qhov tob ntawm nias thaum lub nra loj raug tshem tawm thiab qhov tob ntawm kev nias hauv qab.
Lub Rockwell Hardness Test peb cov rog sim peb thiab peb hom indentters, nrog rau tag nrho cuaj teev ntawm rockwell hardness. Cov 9 teev npog yuav luag txhua cov ntaub ntawv hlau feem ntau siv. Muaj peb hom siv ntau yam: HRA, HRB, thiab HRC, nrog HRC yog cov feem ntau dav siv.
|
Yam |
Xovxwm Lub Taub Hau |
Sim quab yuam F / n (kg) |
Tau luag |
Cov Ntawv Thov |
|
HLAU |
120 Qib Pob Zeb Diamond |
588.4(60) |
20~88 |
Tungsten carbide, saum npoo har hardening hlau, thiab lwm yam. |
|
Hrb |
Ø1.588mm, quenched steel pob |
980.7(100) |
20~100 |
annealed, noralized steel, aluminium alloy Kub, tooj liab alloy, cam khwb cia hlau. |
|
Hrc |
120 Qib Pob Zeb Diamond Lub khob hliav qab |
1471(150) |
20~70 |
quenched thiab tempered steel, quenched thiab tempered steel, tob Txheej saum toj tawv hlau. |
Qhov ntau ntawm HRC yog 20 ~ 70HRC. Thaum lub hardness tsawg dua 20hrc, qhov rhiab heev txo vim muaj ntau dhau los ntawm lub conical feem ntawm indenter. Hauv qhov no, tus pas ntsuas HRB yuav tsum siv hloov; Thaum lub hardness ntawm cov qauv yog ntau dua 67hrc, lub siab nyob rau hauv lub ntsis ntawm indenter yog siab dhau, thiab lub pob zeb diamond tau yooj yim, uas muaj fullens yooj yim lub neej ntawm indenter. Yog li ntawd, HRA yuav tsum siv feem ntau siv xwb.
Lub Pob Zeb Dotrness Hardness yog ib qho yooj yim ua haujlwm, nrawm, thiab muaj me ntsis indentation. Nws tuaj yeem sim cov npoo ntawm cov khoom tiav thiab cov khoom ua haujlwm nyuaj thiab thinner workpieces. Vim tias qhov me me indentation, rau cov ntaub ntawv nrog lub koom haum tsis sib xws thiab tawv tawv, lub hardness tus nqi compressates zoo heev, thiab qhov raug yog tsis yog siab dua brinell hardness. Lub hardness hluav taws xob yog siv los txiav txim siab qhov tawv ntawm cov hlau, cov hlau tsis muaj hlau, nyuaj alloys, thiab lwm yam.
