Iyo inonyanya kushandiswa mukugadzira ndiyo kuoma kweiyo press-in nzira, yakadai seBrinell kuoma, Rockwell kuoma, Vickers kuoma uye micro hardness.Iko kuomeswa kwakawanikwa kukosha kunomiririra kupikisa kwesimbi yepasi kune deformation yepurasitiki inokonzerwa nekupindira kwezvinhu zvekunze.
Iyi inotevera sumo pfupi kune akasiyana siyana ekuomarara zvikamu:
1. Brinell kuoma (HB)
Dzvanya bhora rakaomeswa resimbi yeimwe saizi (kazhinji 10mm mudhayamita) mukati meiyo zvinhu ine imwe mutoro (kazhinji 3000kg) uye uichengete kwenguva yakati.Mushure mokunge mutoro wacho wabviswa, chiyero chemutoro kunzvimbo yekudzivirira ndiyo Brinell hardness value (HB), mu kilogram force / mm2 (N / mm2).
2. Rockwell kuoma (HR)
Kana HB>450 kana sampuli iri diki zvakanyanya, Brinell kuomarara bvunzo haigone kushandiswa uye Rockwell kuyerwa kwekuomarara kunofanira kushandiswa pachinzvimbo.Inoshandisa koni yedhaimondi ine vertex angle ye120 ° kana bhora resimbi rine dhayamita ye1.59mm uye 3.18mm kudzvanya pamusoro pechinhu kuti chiedzwe pasi pemumwe mutoro, uye kuoma kwezvinhu kunowanikwa kubva. kudzika kweiyo indentation.Zvinoenderana nekuoma kweiyo bvunzo zvinhu, inogona kuratidzwa muzvikamu zvitatu zvakasiyana:
HRA: Ndiko kuomarara kunowanikwa nekushandisa 60kg mutoro uye diamond cone indenter, uye inoshandiswa kune zvinhu zvine kuomarara kwakanyanya (senge simende carbide, nezvimwewo).
HRB: Ndiko kuoma kunowanikwa nekushandisa 100kg mutoro uye bhora rakaoma resimbi rine dhayamita ye1.58mm.Inoshandiswa kune zvigadzirwa zvine kuomarara kwakadzika (senge annealed steel, cast iron, etc.).
HRC: Ndiko kuomarara kunowanikwa nekushandisa 150kg mutoro uye diamond cone indenter, uye inoshandiswa kune zvinhu zvine hurema hwakanyanya (senge simbi yakaoma, nezvimwewo).
3 Vickers kuoma (HV)
Shandisa dhaimondi sikweya cone indenter ine mutoro usingasviki 120kg uye vertex angle ye136 ° kudzvanya mukati mechinhu chepamusoro, uye kupatsanura nzvimbo yepasi pegomba remukati nekukosha kwemutoro, inova Vickers kuomarara HV kukosha ( kgf/mm2).
Kuenzaniswa neBrinell uye Rockwell kuomarara bvunzo, Vickers kuomarara bvunzo ine zvakawanda zvakanaka.Iyo haina zvipingamupinyi zvezvakatsanangurwa mamiriro emutoro P uye indenter dhayamita D seBrinell, uye dambudziko re deformation ye indenter;uye haina dambudziko rekuti kuomarara kukosha kweRockwell hakugone kubatana.Uye inogona kuyedza chero yakapfava uye yakaoma zvinhu seRockwell, uye inogona kuyedza kuomarara kwezvikamu zvakatetepa zvakanyanya (kana zvitete zvitete) zviri nani pane Rockwell, iyo inogona chete kuitwa neRockwell pamusoro pekuoma.Asi kunyangwe pasi pemamiriro akadai, inogona kuenzaniswa mukati meiyo Rockwell chiyero, uye haigone kubatanidzwa nemamwe mazinga ekuoma.Pamusoro pezvo, nekuti Rockwell inoshandisa kudzika kweiyo indentation seyero yekuyera, uye kudzika kweiyo indentation kunogara kuri kudiki pane indentation upamhi, saka kukanganisa kwayo kwakakura zvakare.Naizvozvo, iyo Rockwell kuomarara data haina kugadzikana seBrinell naVickers, uye zvechokwadi haina kugadzikana seVickers chaiyo.
Pane humwe hukama hwekushandura pakati paBrinell, Rockwell naVickers, uye kune tafura yekutendeuka yehukama inogona kubvunzwa.
Nguva yekutumira: Mar-16-2023
