Cov cai rau hlau hardness yog H. Raws li cov kev sib txawv hardness test, cov pa sawv cev muaj xws li Brinell (HB), Rockwell (HRC), Vickers (HV), Leeb (HL), Shore (HS) hardness, thiab lwm yam. HB thiab HRC feem ntau siv. HB muaj ntau yam kev siv, thiab HRC yog tsim rau cov ntaub ntawv uas muaj siab hardness, xws li kev kho cua sov hardness. Qhov txawv yog qhov indenter ntawm hardness tester txawv. Brinell hardness tester yog pob indenter, thaum Rockwell hardness tester yog pob zeb diamond indenter.
HV-haum rau kev tsom xam tsom xam. Vickers hardness (HV) Nias cov khoom nto nrog lub load tsawg dua 120kg thiab pob zeb diamond square cone indenter nrog lub kaum sab xis ntawm 136 °. Qhov chaw ntawm cov khoom siv indentation qhov yog muab faib los ntawm tus nqi thauj khoom, uas yog Vickers hardness tus nqi (HV). Vickers hardness yog qhia raws li HV (xa mus rau GB / T4340-1999), thiab nws ntsuas cov qauv nyias nyias.
HL portable hardness tester yog yooj yim rau kev ntsuas. Nws siv qhov cuam tshuam lub taub hau los cuam tshuam lub hardness nto thiab tsim ib qho bounce. Lub hardness yog xam los ntawm qhov sib piv ntawm rebound ceev ntawm lub punch ntawm 1 hli los ntawm cov qauv nto mus rau qhov cuam tshuam ceev. The formula is: Leeb hardness HL = 1000 × VB (rebound speed)/VA (impact speed).
Portable Leeb hardness tester tuaj yeem hloov mus rau hauv Brinell (HB), Rockwell (HRC), Vickers (HV), Shore (HS) hardness tom qab Leeb (HL) ntsuas. Lossis siv Leeb txoj cai los ntsuas qhov ntsuas qhov hnyav nrog Brinell (HB), Rockwell (HRC), Vickers (HV), Leeb (HL), Shore (HS).
HB - Brinell hardness:
Brinell hardness (HB) feem ntau yog siv thaum cov khoom yog softer, xws li non-ferrous hlau, hlau ua ntej kev kho cua sov los yog tom qab annealing. Rockwell hardness (HRC) feem ntau yog siv rau cov ntaub ntawv uas muaj zog dua, xws li hardness tom qab kev kho cua sov, thiab lwm yam.
Brinell hardness (HB) yog ib qho kev xeem ntawm ib qho me me. Lub pob steel pob los yog carbide pob ntawm ib txoj kab uas hla yog nias rau hauv cov hlau saum npoo los kuaj. Kev kuaj load yog khaws cia rau lub sijhawm teev tseg, thiab tom qab ntawd cov load raug tshem tawm los ntsuas lub cheeb ntawm qhov indentation ntawm qhov chaw yuav tsum tau kuaj. Tus nqi Brinell hardness yog cov quotient tau los ntawm kev faib cov load los ntawm qhov chaw ntawm lub ntsej muag kheej kheej ntawm qhov indentation. Feem ntau, lub pob steel tawv ntawm ib qho loj me (feem ntau yog 10mm hauv txoj kab uas hla) yog nias rau hauv cov khoom nto nrog ib qho kev thauj khoom (feem ntau 3000kg) thiab khaws cia rau lub sijhawm. Tom qab tshem tawm cov load, qhov piv ntawm qhov load rau qhov chaw indentation yog Brinell hardness tus nqi (HB), thiab chav tsev yog kilogram force / mm2 (N / mm2).
Rockwell hardness txiav txim qhov hardness tus nqi ntsuas raws li cov yas deformation qhov tob ntawm qhov indentation. 0.002 hli yog siv los ua hardness unit. Thaum HB> 450 lossis cov qauv me dhau, Brinell hardness test tsis tuaj yeem siv thiab ntsuas Rockwell hardness yog siv los hloov. Nws siv lub pob zeb diamond cone nrog lub kaum sab xis ntawm 120 ° lossis lub pob steel nrog txoj kab uas hla ntawm 1.59 lossis 3.18mm los nias rau hauv qhov chaw ntawm cov khoom nyob rau hauv kev sim nyob rau hauv ib tug tej yam load, thiab hardness ntawm cov khoom yog xam los ntawm qhov tob. ntawm qhov indentation. Raws li qhov hardness ntawm cov khoom siv kuaj, nws tau qhia nyob rau hauv peb qhov sib txawv:
HRA: Nws yog qhov hardness tau los ntawm kev siv 60kg load thiab pob zeb diamond cone indenter, uas yog siv rau cov ntaub ntawv uas tsis tshua muaj siab hardness (xws li cemented carbide, thiab lwm yam).
HRB: Nws yog lub hardness tau los ntawm kev siv 100kg load thiab hardened steel pob nrog ib txoj kab uas hla ntawm 1.58mm, uas yog siv rau cov ntaub ntawv uas muaj tsawg 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 cone indenter, uas yog siv rau cov ntaub ntawv uas muaj hardness heev (xws li hardened steel, thiab lwm yam).
Ntxiv rau:
1.HRC txhais tau tias Rockwell hardness C nplai.
2.HRC thiab HB tau siv dav hauv kev tsim khoom.
3.HRC siv tau ntau yam HRC 20-67, sib npaug rau HB225-650,
Yog tias qhov hardness siab tshaj qhov ntau, siv Rockwell hardness A scale HRA,
Yog tias qhov hardness qis dua qhov ntau, siv Rockwell hardness B nplai HRB,
Lub siab txwv ntawm Brinell hardness yog HB650, uas tsis tuaj yeem siab dua li tus nqi no.
4.Qhov indenter ntawm Rockwell hardness tester C nplai yog lub pob zeb diamond lub khob nrog lub kaum sab xis ntawm 120 degrees. Qhov kuaj load yog ib qho nqi. Suav tus qauv yog 150 kgf. Lub indenter ntawm Brinell hardness tester yog lub pob steel hardened (HBS) lossis carbide pob (HBW). Qhov kev kuaj load sib txawv nrog lub cheeb ntawm lub pob, xws li 3000 txog 31.25 kgf.
5.The Rockwell hardness indentation yog me me, thiab qhov ntsuas tus nqi yog nyob hauv zos. Nws yog ib qho tsim nyog los ntsuas ob peb lub ntsiab lus kom pom qhov nruab nrab tus nqi. Nws yog qhov tsim nyog rau cov khoom tiav thiab cov hlais nyias thiab raug cais raws li kev sim tsis muaj kev puas tsuaj. Brinell hardness indentation yog qhov loj dua, qhov ntsuas tus nqi yog qhov tseeb, nws tsis haum rau cov khoom tiav thiab cov hlais nyias, thiab feem ntau tsis suav tias yog kev kuaj tsis raug.
6. Tus nqi hardness ntawm Rockwell hardness yog ib qho tsis muaj npe tsis muaj units. (Yog li ntawd, nws tsis raug hu rau Rockwell hardness raws li ib qho degree.) Qhov hardness tus nqi ntawm Brinell hardness muaj units thiab muaj ib qho kev sib raug zoo nrog tensile zog.
7. Rockwell hardness yog ncaj qha tso tawm rau ntawm lub dial lossis digitally tso tawm. Nws yog ib qho yooj yim rau kev khiav lag luam, ceev thiab intuitive, thiab haum rau loj ntau lawm. Brinell hardness yuav tsum tau siv lub tshuab ntsuas qhov ntsuas qhov indentation txoj kab uas hla, thiab tom qab ntawd saib lub rooj lossis xam, uas yog qhov nyuaj rau kev khiav lag luam.
8. Raws li qee qhov xwm txheej, HB thiab HRC tuaj yeem hloov pauv los ntawm kev saib lub rooj. Cov qauv kev puas siab puas ntsws tuaj yeem sau tau zoo li: 1HRC≈1/10HB.
Kev xeem Hardness yog ib txoj kev sim yooj yim thiab yooj yim hauv kev sim cov cuab yeej cuab tam. Txhawm rau siv cov kev sim hardness los hloov qee yam kev ntsuas cov cuab yeej cuab tam, kev sib raug zoo hloov dua siab tshiab ntawm hardness thiab lub zog yog xav tau hauv kev tsim khoom.
Kev xyaum tau ua pov thawj tias muaj kev sib raug zoo sib xws ntawm ntau yam hardness qhov tseem ceeb ntawm cov ntaub ntawv hlau thiab nruab nrab ntawm tus nqi hardness thiab lub zog tus nqi. Vim hais tias tus nqi hardness yog txiav txim los ntawm thawj cov yas deformation tsis kam thiab cov yas txuas ntxiv deformation tsis kam, lub zog ntawm cov khoom ntau dua, cov yas deformation siab dua, thiab cov nqi hardness ntau dua.
Post lub sij hawm: Aug-16-2024
