E sebelisoang haholo tlhahisong ke ho thatafala ha mokhoa oa ho hatisa, joalo ka Brinell hardness, Rockwell hardness, Vickers hardness le micro hardness.Boleng ba boima bo fumanoeng ha e le hantle bo emela ho hanyetsa bokaholimo ba tšepe ho deformation ea polasetiki e bakoang ke ho kenella ha lintho tse tsoang kantle ho naha.
Se latelang ke kenyelletso e khuts'oane ea li-unit tse fapaneng tsa hardness:
1. Brinell hardness (HB)
Tobetsa bolo ea tšepe e thata ea boholo bo itseng (hangata bophara ba 10mm) ka holim'a thepa e nang le mojaro o itseng (ka kakaretso 3000kg) 'me u e boloke nako e itseng.Ka mor'a hore mojaro o tlosoe, karo-karolelano ea mojaro sebakeng sa indentation ke boleng ba boima ba Brinell (HB), ka matla a kilogram / mm2 (N / mm2).
2. Rockwell hardness (HR)
Ha HB>450 kapa sampole e le nyane haholo, tlhahlobo ea boima ba Brinell e ke ke ea sebelisoa 'me ho lokela hore ho sebelisoe tekanyo ea boima ba Rockwell.E sebelisa khoune ea daemane e nang le angle ea vertex ea 120 ° kapa bolo ea tšepe e bophara ba 1.59mm le 3.18mm ho hatella holim'a thepa e lokelang ho lekoa tlas'a mojaro o itseng, 'me boima ba thepa bo fumanoa ho tloha. botebo ba ho kenyeletsoa.Ho latela boima ba thepa ea tlhahlobo, e ka hlalosoa ka litekanyo tse tharo tse fapaneng:
HRA: Ke boima bo fumanoeng ka ho sebelisa mojaro oa 60kg le indenter ea khoune ea daemane, 'me e sebelisetsoa lisebelisoa tse thata haholo (joalo ka carbide e samente, joalo-joalo).
HRB: Ke boima bo fumanoang ka ho sebelisa mojaro oa 100kg le bolo ea tšepe e thata e nang le bophara ba 1.58mm.E sebelisoa bakeng sa lisebelisoa tse nang le boima bo tlase (joalo ka tšepe e kentsoeng, tšepe e entsoeng ka tšepe, joalo-joalo).
HRC: Ke boima bo fumanoeng ka ho sebelisa mojaro oa 150kg le indenter ea khoune ea daemane, 'me e sebelisetsoa lisebelisoa tse thata haholo (joalo ka tšepe e thata, joalo-joalo).
3 Vickers hardness (HV)
Sebelisa indenter ea lisekoere tsa daemane e nang le boima bo ka tlase ho 120kg le sekhahla sa vertex sa 136 ° ho hatella bokaholimo ba thepa, 'me u arole sebaka se kaholimo sa sekoti sa indentation ka boleng ba mojaro, e leng boleng ba Vickers hardness HV. kgf/mm2).
Ha ho bapisoa le liteko tsa boima ba Brinell le Rockwell, tlhahlobo ea boima ba Vickers e na le melemo e mengata.Ha e na lithibelo tsa maemo a boletsoeng a mojaro oa P le bophara ba li-indenter D joalo ka Brinell, le bothata ba deformation ea indenter;hape ha e na bothata ba hore boleng ba boima ba Rockwell bo ke ke ba kopanngoa.Mme e ka leka lisebelisoa life kapa life tse bonolo le tse thata joalo ka Rockwell, mme e khona ho leka ho thatafala ha likarolo tse tšesaane haholo (kapa likarolo tse tšesaane) ho feta Rockwell, e ka etsoang feela ka ho thatafala ha Rockwell surface.Empa le tlas'a maemo a joalo, e ka bapisoa feela ka har'a sekhahla sa Rockwell, 'me e ke ke ea kopanngoa le maemo a mang a thata.Ho phaella moo, hobane Rockwell o sebelisa botebo ba ho indentation e le tekanyo ea tekanyo, 'me botebo ba indentation bo lula bo le nyane ho feta bophara ba ho indentation, kahoo phoso ea eona e amanang le eona e kholoanyane.Ka hona, data ea hardness ea Rockwell ha e tsitsitse joaloka Brinell le Vickers, 'me ha e le hantle ha e tsitsa joaloka Vickers ka nepo.
Ho na le kamano e itseng ea phetoho lipakeng tsa Brinell, Rockwell le Vickers, 'me ho na le tafole ea phetoho e ka botsoang.
Nako ea poso: Mar-16-2023
