Ko te tikanga pēhi-roto e whakamahia whānuitia ana i roto i te whakaputa ko te pakeke o te tikanga pēhi-roto, pērā i te pakeketanga o Brinell, te pakeketanga o Rockwell, te pakeketanga o Vickers me te pakeketanga moroiti. Ko te uara pakeke e whiwhihia ana ko te ātete o te mata whakarewa ki te whakarerekētanga kirihou i puta mai i te urunga mai o ngā mea ke.
Anei tētahi whakataki poto ki ngā momo waeine mārō:
1. Te pakeketanga o Brinell (HB)
Pēhia he pōro maitai whakapakeke o tētahi rahi (10mm te whānui) ki roto i te mata o te rauemi me tētahi kawenga (3000kg te taumaha) ka pupuri mō tētahi wā. I muri i te tango i te kawenga, ko te ōwehenga o te kawenga ki te wāhi kōpiko ko te uara pakeke Brinell (HB), i roto i te kaha kirokaramu/mm2 (N/mm2).
2. Te pakeke o Rockwell (HR)
Ina neke atu i te HB 450, ina iti rawa rānei te tauira, kāore e taea te whakamahi i te whakamātautau pakeke Brinell, engari me whakamahi te ine pakeke Rockwell hei utu. Ka whakamahia he kōne taimana me te koki tihi o te 120°, he pōro maitai rānei me te diameter o te 1.59mm me te 3.18mm hei pēhi ki te mata o te rauemi hei whakamātautau i raro i tētahi kawenga, ā, ka whiwhihia te pakeke o te rauemi mai i te hohonutanga o te kōhao. E ai ki te pakeke o te rauemi whakamātautau, ka taea te whakaatu i roto i ngā tauine rerekē e toru:
HRA: Ko te pakeketanga tēnei e whiwhihia ana mā te whakamahi i te kawenga 60kg me te kōhao kōne taimana, ā, e whakamahia ana mō ngā rauemi he tino pakeke (pērā i te carbide sima, me ētahi atu).
HRB: Ko te pakeketanga tēnei e whiwhihia ana mā te whakamahi i tētahi kawenga 100kg me tētahi pōro maitai whakapakeketia he 1.58mm te whānui. Ka whakamahia mō ngā rauemi he iti ake te pakeketanga (pērā i te maitai kua whakawerahia, te rino maka, me ētahi atu).
HRC: Ko te pakeketanga tēnei e whiwhihia ana mā te whakamahi i te kawenga 150kg me te kōhao kōne taimana, ā, e whakamahia ana mō ngā rauemi he tino pakeke (pērā i te maitai whakapakeketia, me ētahi atu).
3 Te pakeketanga o Vickers (HV)
Whakamahia he kōhao kōne tapawhā taimana me te kawenga iti iho i te 120kg me te koki tihi o te 136° hei pēhi ki roto i te mata rauemi, ka wehea te horahanga mata o te poka kōhao rauemi mā te uara kawenga, arā, te uara pakeke Vickers HV (kgf/mm2).
Ki te whakatauritea ki ngā whakamātautau pakeke o Brinell me Rockwell, he maha ngā painga o te whakamātautau pakeke o Vickers. Kāore he here o ngā tikanga kua tohua o te kawenga P me te diameter o te indentor D pērā i a Brinell, me te raruraru o te whakarerekētanga o te indentor; kāore hoki he raruraru e kore e taea te whakakotahi i te uara pakeke o Rockwell. Ā, ka taea e ia te whakamātautau i ngā rauemi ngohengohe me ngā rauemi pakeke pērā i a Rockwell, ā, ka taea e ia te whakamātautau i te pakeke o ngā wāhanga tino angiangi (ngā paparanga angiangi rānei) pai ake i a Rockwell, ka taea anake te mahi mā te pakeke o te mata o Rockwell. Ahakoa i raro i ēnei tikanga, ka taea anake te whakataurite i roto i te tauine Rockwell, ā, kāore e taea te whakakotahi me ētahi atu taumata pakeke. Hei tāpiri, nā te mea ka whakamahia e Rockwell te hohonutanga o te indentor hei taupū ine, ā, he iti ake te hohonutanga o te indentor i te whānui o te indentor, nō reira he nui ake hoki tōna hapa whanaunga. Nō reira, kāore ngā raraunga pakeke o Rockwell i te pumau pērā i a Brinell me Vickers, ā, kāore hoki i te pumau pērā i te tika o Vickers.
He hononga tahuritanga kei waenganui i a Brinell, Rockwell me Vickers, ā, he ripanga hononga tahuritanga anō hoki ka taea te pātai.
Wā tuku: Maehe-16-2023
