Khethollo ea boima bo fapaneng ba tšepe

Portable Leeb hardness tester e ka fetoloa Brinell (HB), Rockwell (HRC), Vickers (HV), Shore (HS) hardness ka mor'a tekanyo ea Leeb (HL). Kapa sebelisa molao-motheo oa Leeb ho lekanya boleng ba boima ka ho toba ka Brinell (HB), Rockwell (HRC), Vickers (HV), Leeb (HL), Shore (HS).
HB - Brinell hardness:
Brinell hardness (HB) hangata e sebelisoa ha thepa e le bonolo, joalo ka litšepe tse senang ferrous, tšepe pele ho phekolo ea mocheso kapa ka mor'a ho kolobisoa. Rockwell hardness (HRC) hangata e sebelisoa bakeng sa lisebelisoa tse thata haholo, joalo ka ho thatafala kamora kalafo ea mocheso, jj.
Brinell hardness (HB) ke boima ba teko ea boholo bo itseng. Bolo ea tšepe e thata kapa bolo ea carbide ea bophara bo itseng e hatelloa ka holim'a tšepe hore e lekoe. Mojaro oa teko o bolokoa ka nako e itseng, ebe moroalo o tlosoa ho lekanya bophara ba indentation holim'a metsi ho lekoa. Boleng ba Brinell hardness ke quotient e fumanoang ka ho arola mojaro ka sebaka se chitja sa indentation. Ka kakaretso, bolo ea tšepe e thata ea boholo bo itseng (hangata 10mm ka bophara) e hatelloa ka holim'a thepa e nang le mojaro o itseng (hangata 3000kg) mme e bolokiloe ka nako e itseng. Ka mor'a hore mojaro o tlosoe, karo-karolelano ea mojaro sebakeng sa indentation ke boleng ba boima ba Brinell (HB), 'me unit ke matla a kilogram / mm2 (N / mm2).
Rockwell hardness e lekanya index ea boleng ba hardness e ipapisitseng le botebo ba deformation ea polasetiki ea indentation. 0.002 mm e sebelisoa e le yuniti ea boima. Ha HB>450 kapa sampole e le nyane haholo, teko ea boima ba Brinell e ke ke ea sebelisoa 'me ho sebelisoa tekanyo ea boima ba Rockwell. E sebelisa khoune ea daemane e nang le vertex angle ea 120 ° kapa bolo ea tšepe e nang le bophara ba 1.59 kapa 3.18mm ho hatella holim'a thepa tlas'a teko tlas'a mojaro o itseng, 'me boima ba thepa bo baloa ho tloha botebong. ea ho indentation. Ho ea ka boima ba thepa ea teko, e hlahisoa ka litekanyo tse tharo tse fapaneng:
HRA: Ke boima bo fumanoeng ka ho sebelisa mojaro oa 60kg le indenter ea khoune ea daemane, e sebelisetsoang lisebelisoa tse thata haholo (joalo ka carbide e samenteng, jj.).
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 sebelisetsoang thepa e nang le boima bo tlaase (joaloka tšepe e entsoeng ka tšepe, tšepe e entsoeng ka tšepe, joalo-joalo).
HRC: Ke boima bo fumanoeng ka ho sebelisa mojaro oa 150kg le indenter ea khoune ea daemane, e sebelisetsoang lisebelisoa tse thata haholo (tse kang tšepe e thata, joalo-joalo).
Holim'a moo:
1.HRC e bolela ho thatafala ha Rockwell C sekala.
2.HRC le HB li sebelisoa haholo tlhahisong.
3.HRC e sebetsang mefuta e fapaneng ea HRC 20-67, e lekanang le HB225-650,
Haeba boima bo phahame ho feta mofuta ona, sebelisa Rockwell hardness A scale HRA,
Haeba boima bo le tlase ho mofuta ona, sebelisa Rockwell hardness B scale HRB,
Moeli o ka holimo oa Brinell hardness ke HB650, e ke keng ea ba holimo ho feta boleng bona.
4.Indenter ea Rockwell hardness tester C sekala ke khoune ea daemane e nang le vertex angle ea likhato tse 120. Mojaro oa teko ke boleng bo itseng. Tekanyetso ea China ke 150 kgf. Indenter ea Brinell hardness tester ke bolo ea tšepe e thata (HBS) kapa bolo ea carbide (HBW). Boima ba teko bo fapana ka bophara ba bolo, ho tloha ho 3000 ho isa ho 31.25 kgf.
5.The Rockwell hardness indentation e nyane haholo, mme boleng bo lekantsoeng bo fumaneha sebakeng sa heno. Hoa hlokahala ho lekanya lintlha tse 'maloa ho fumana boleng ba karolelano. E loketse lihlahisoa tse feliloeng le lilae tse tšesaane 'me li khetholloa e le tlhahlobo e sa senyeheng. The Brinell hardness indentation e kholoanyane, boleng bo lekantsoeng bo nepahetse, ha bo loketse lihlahisoa tse felileng le lilae tse tšesaane, 'me ka kakaretso ha li khethoe e le tlhahlobo e sa senyeheng.
6. Boleng ba boima ba Rockwell hardness ke palo e sa boleloang ka mabitso ntle le li-unit. (Ka hona, ho fosahetse ho bitsa Rockwell hardness e le tekanyo e itseng.) The hardness value of Brinell hardness e na le li-unit mme e na le kamano e itseng e hakanyetsoang le matla a tensile.
7. Ho thatafala ha Rockwell ho bontšoa ka ho toba ho daela kapa ho bontšoa ka mokhoa oa digital. E bonolo ho sebetsa, e potlakile ebile e utloahala, 'me e loketse tlhahiso ea bongata. Ho thatafala ha Brinell ho hloka microscope ho lekanya bophara ba indentation, ebe u sheba tafoleng kapa ho bala, e leng ho leng thata ho sebetsa.
8. Tlas'a maemo a itseng, HB le HRC li ka fapanyetsanoa ka ho sheba tafoleng. Foromo ea lipalo tsa kelello e ka tlalehoa e le: 1HRC≈1/10HB.
Teko ea boima ke mokhoa o bonolo le o bonolo oa teko tekong ea thepa ea mochini. E le ho sebelisa teko ea boima ho fetola liteko tse itseng tsa thepa ea mochine, ho hlokahala kamano e nepahetseng ea phetoho pakeng tsa boima le matla tlhahisong.
Boikoetliso bo pakile hore ho na le kamano e batlang e tšoana pakeng tsa boleng bo fapaneng ba boima ba thepa ea tšepe le lipakeng tsa boleng ba boima le boleng ba matla. Hobane boleng ba boima bo khethoa ke khanyetso ea pele ea deformation ea polasetiki le khanyetso e tsoelang pele ea deformation ea polasetiki, matla a thepa a phahame, a phahamisa khanyetso ea deformation ea polasetiki, 'me boleng ba boima bo phahame.