Aratohu Mīhini me te Tiaki i te Pereti Mata Karāhe: Me whakamahi mīhini me te tiaki motuhake mō te pereti mata karāhe tino tika kia tika ai, kia roa ai hoki te ora. I mua i te Whakakanapa, me tukatuka tuatahi te wāhanga karāhe ki te mīhini me te whakarerekētanga whakapae i runga i ngā mātāpono tūnga tapatoru. I muri i te huri whakapae, ki te kore e taea e te mīhini CNC te whakatutuki i te tika e hiahiatia ana—ko te tikanga ka eke ki te tika o te Wāhanga 0 (te manawanui 0.01mm/m e ai ki te DIN 876)—ka hiahiatia te whakaoti ā-ringa hei whakatutuki i ngā tohu tika teitei ake pērā i te Wāhanga 00 (te manawanui 0.005mm/m e ai ki ngā paerewa ASTM B89.3.7).
He maha ngā mahi nui o te tukanga miihini. Tuatahi, ka whakatūria e te huri matapōkere te papatahi taketake, ā, muri iho ka whakakīia te haurua tuarua hei tango i ngā tohu miihini. Ko te huri tika, e mahia ā-ringa ana i te nuinga o te wā, ka whakatikatika i te mata kia tutuki ai te ātete papatahi me te matapōkere e hiahiatia ana (te uara Ra o te 0.32-0.63μm, ko Ra te tohu i te toharite tātaitanga o te kōtaha mata). Hei whakamutunga, mā te tirotiro tino tika ka whakarite kia tutuki ngā paerewa hangarau, me ngā pūwāhi ine kua whakanohoia ki ngā taha whakarara, ngā taha, me ngā rārangi waenga—ko te tikanga he 10-50 ngā pūwāhi i runga i te rahi o te pereti—kia tika ai te aromatawai.
He nui te pānga o te whakahaere me te tāutanga ki te tika. Nā te pakari o te karāhe (te pakeke o Mohs 6-7), ka taea e te hapaitanga te whakapōturi i te āhua tuturu. Mō ngā tono nui e hiahia ana ki te tika o te Wāhanga 00, he mea nui te huri ā-ringa i muri i te tāutanga hei whakahoki mai i te tika i pakaru i te wā e kawe ana. Mā tēnei aro ki ngā taipitopito ka wehewehea ngā pereti mata karāhe tino tika mai i ngā putanga mīhini paerewa.
Ka pā tika ngā mahi tiaki ki te mahi me te roa o te ora. Tīmata mā te horoi pai mā te whakamahi i ngā kaihoroi pH kūpapa—kaua e whakamahi i ngā matū waikawa ka taea te haehae i te mata. Mā te whakatikatika ā-tau me ngā inenga laser, e taea te whai i ngā paerewa NIST, ka mau tonu te tika. I te wā e whakatakoto ana i ngā mea mahi, tukua kia taurite te pāmahana (15-30 meneti te nuinga) hei ārai i ngā hapa ine mai i ngā rerekētanga pāmahana. Kaua rawa e nekehia ngā mea taratara ki runga i te mata, nā te mea ka taea e tēnei te hanga i ngā karawarawa moroiti ka pā ki te papatahi.
Ko ngā aratohu whakamahinga tika ko te whakaute i ngā here kawenga hei ārai i te whakarerekētanga hanganga, te pupuri i ngā āhuatanga taiao pumau (te pāmahana 20±2°C, te haumākū 50±5%), me te whakamahi i ngā taputapu hiki motuhake hei karo i te kino o te papa tapahi. Kāore i rite ki ngā mea whakarewa, ko te pumau wera o te karāhe (0.01ppm/°C) ka whakaiti i ngā awe taiao, engari me karo tonu i ngā huringa pāmahana ohorere.
Hei taputapu tūāpapa mō te ine tika, ko ngā pereti mata karāhe kua whaimanahia (kua whakamanahia e te ISO 17025) hei paerewa tohutoro mō ngā inenga ā-ahu. He iti noa te mahi tiaki e hiahiatia ana—me muru noa ki te kakahu kore-miro i muri i te whakamahinga—kāore e hiahiatia he paninga motuhake, he hinu whakahinuhinu rānei. Mā te whai i ēnei tikanga miihini me te tiaki, ka tukuna e ngā pereti mata karāhe tika te mahi pono mō ngā tekau tau, ka waiho hei mea nui i roto i ngā taiwhanga whakatikatika, te hanga rererangi, me ngā tono hangarau tino tika.
Wā tuku: Whiringa-ā-rangi 19-2025