Covcarbon steel boltspeb feem ntau siv, ntxiv rau qhov tsim nyog cov kev ntsuas kev ua tau zoo, tus qauv bolt hardness kuj yog ib qho tseem ceeb heev, yog li yuav ua li cas los ntsuas lub bolt hardness?
Ua ntej tshaj plaws, stainless hlau boltsTsis tas yuav tsum tau ua kom tawv, vim tias thaum peb tsim cov hlau tsis muaj steel bolts, peb tsuas yog hloov cov tsos ntawm cov khoom, tab sis tsis hloov pauv rau nws qhov kev ua tau zoo. Dab tsi yog qhov kev ua tau zoo ntawm qhov tiav stainless hlau ntsia liaj qhov rooj? Qhov tseeb, nws yog kev ua haujlwm ntawm cov khoom siv. Yog li ntawd, tsis tas yuav tsum tau lees paub qhov hardness ntawm stainless hlau bolts, tab sis tsuas yog saib seb nws yog cov khoom siv.
Yog li ntawd, qhov ntsuas ntawm hardness tsuas yog siv tau rau carbon steel bolts. Ntau qib ntawm bolts muaj qhov sib txawv hardness. Raws li cov kev txwv tsis pub dhau lub teb chaws tus qauv, qhov hardness ntawm 4.8- qib bolts yog qhov qis tshaj, nrog rau HRC tus nqi ntawm 15 degrees, thaum lub bolts ntawm qib siab dua yog 6.8, nrog HRC hardness. Nyob ib ncig ntawm 17 degrees. Ib qib siab dua yog 8.8 qib bolt uas peb siv tshaj plaws, nws HRC hardness yog li 23 degrees, qib siab dua yog 10.9 qib bolt, hardness yog li 32 degrees, thiab qhov kawg yog qib 12.9 qib bolt, uas muaj lub zog siab tshaj. , hardness kuj yog qhov siab tshaj plaws, HRC tus nqi yog nyob ib ncig ntawm 39 degrees. Txij li cov duab ntawm lub ntsia liaj qhov rooj tsis yog lub dav hlau ua tiav, qhov hardness ntawm txhua qhov sib txawv me ntsis, thiab cov qauv hardness nyob ntawm tus nqi nruab nrab.
Yog li yuav ua li cas kuaj lub hardness ntawm lub ntsia liaj qhov rooj?
Cia peb tham txog Brinell hardness ua ntej. Txhawm rau ntsuas Brinell hardness ntawm lub ntsia liaj qhov rooj, nws yog ib qho tsim nyog yuav tau siv lub pob steel indenter lossis ib qho nyuaj alloy indenter. Brinell hardness yog tsim rau cov ntaub ntawv hauv qab 450HBS, uas tuaj yeem ntsuas nrog lub pob steel indenter, thaum cov ntaub ntawv siab dua 650HBS, Alloy indenters yuav tsum tau siv los ntsuas. Feem ntau, 12L15 cov ntaub ntawv yuav raug kuaj rau Brinell hardness, thaum bolts tsis tshua muaj yuav tsum tau kuaj rau Brinell hardness.
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Khoom siv |
Brinell hardness |
Test quab yuam - qhov piv ntawm lub square txoj kab uas hla ntawm lub indenter pob |
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Nua standard |
Old txheem |
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Steel |
＜140 |
30 |
10 |
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Ntau dua lossis sib npaug li 140 |
30 |
30 |
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Nickel thiab Titanium Alloys |
30 |
-- |
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Cast hlau |
＜140 |
10 |
10 |
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Ntau dua lossis sib npaug li 140 |
30 |
30 |
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Copper thiab Copper Alloys |
Nua standard |
Old txheem |
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＜35 |
＜35 |
5 |
5 |
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35 -- 200 |
35 -- 130 |
10 |
10 |
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|
＞200 |
＞130 |
30 |
30 |
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Lub teeb hlau thiab lawv cov alloys |
＜35 |
2.5 |
2.5（1.25） |
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35 -- 80 |
10 (5 los yog 15) |
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＞80 |
10（15） |
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Lua ed,Thauv |
1 |
1.25（1） |
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Lub rooj yog qhov sib piv ntawm cov qauv qub thiab tshiab. Hauv cov khoom siv ntsia hlau, qhov tseem ceeb tshaj plaws yog Rockwell hardness, uas yog qhov peb hu ua HRC hardness standard. Rockwell hardness tau pib tswj nyob rau hauv 2004, thiab rau hardness indicators, As thiab nws cov Scope ntawm daim ntawv thov tau ntxiv raws li cov yav dhau los sawv daws yuav, uas yog 15N/30N/45N/15T/30T thiab 45T. Nyob rau hauv tus qauv qub, nws tau teev tseg tias pob zeb diamond Lub indenter yog siv los kuaj lub Rockwell hardness, thiab nyob rau hauv tus qauv tshiab, nws kuj yuav ntsuas nrog ib tug carbide indenter. Tsis tas li ntawd, xa mus rau qhov chaw khaws cia thiab qhov kub thiab txias hloov ntawm lub sijhawm ntawd, qhov kev sim qhia txog kev khaws cia cov cai tau ntxiv, thiab qhov tseeb ntawm qhov kev sim yuav tsum yog 0.5HR.
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Rockwell hardness nplai |
Hardness cim |
Hom taub hau |
Thawj qhov kev sim quab yuam N |
Main xeem force N |
Total test force N |
Scope ntawm daim ntawv thov |
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15N |
HR 15 N |
Pob zeb diamond |
29.42 |
117.7 |
147.1 |
70 - 94 HR 15 N |
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30N |
HR 30 N |
Pob zeb diamond |
29.42 |
264.8 |
294.2 |
42 - 86 HR 30 N |
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45N |
HR 45 N |
Pob zeb diamond |
29.42 |
411.9 |
441.3 |
20 - 77 HR 45 N |
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15T |
HR 15 T |
Txoj kab uas hla 1.5875mm ib |
29.42 |
117.7 |
447.1 |
67 - 93 HR 15 T |
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30T |
HR 30 T |
Txoj kab uas hla 1.5875mm ib |
29.42 |
264.8 |
294.2 |
29 - 82 HR 30 T |
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45T |
HR 45 T |
Txoj kab uas hla 1.5875mm ib |
29.42 |
411.9 |
411.9 |
10 - 72 HR 45 T |
