Ko ngā pukapuka porowhita (tae atu ki ngā pukapuka matua me ngā pukapuka tokotoko hono) he wāhanga matua mō te tuku i te mana o te mīhini. E ai ki ngā whakaritenga o te paerewa ā-motu GB/T 24595-2020, me tino whakahaere te pakeke o ngā pae maitai e whakamahia ana mō ngā porowhita i muri i te tinei me te whakamahana. He mārama ngā paerewa ā-ture mō te pakeke o ngā pukapuka porowhita i roto i ngā ahumahi motuka o te motu me te ao, ā, he mea nui te whakamātautau pakeke i mua i te wehenga atu o te hua i te wheketere.
E ai ki te GB/T 24595-2020 Steel Bars for Automobile Crankshafts and Camshafts, me tutuki i te pakeke o te mata o ngā pukapuka crankshaft te whakaritenga o te HB 220-280 i muri i te tinei me te whakamahana.
E ai ki te paerewa ASTM A1085 (nā te American Society for Testing and Materials, ASTM) me ≥ HRC 28 (e rite ana ki te HB 270) te pakeke o ngā porowhita hononga mō ngā toki porowhita o ngā waka pāhihi.
Ahakoa mai i te tirohanga a te taha whakaputa hei karo i ngā utu mahi anō me te tiaki i te ingoa kounga, mai i te tirohanga a te kaiwhakamahi hei ārai i te whakapoto i te roa o te mahi miihini me ngā mōrearea rahunga, mai i te tirohanga a muri-hoko hei karo i ngā aituā haumaru, he mea nui kia āraia ngā hua iti iho i te paerewa kia uru ki te mākete, me te whakahaere i ngā whakamātautau pakeke o te porowhita kia tino rite ki ngā paerewa.
Ko te whakamātautau pakeke Rockwell i hangaia e tā mātou kamupene mō ngā toki porowhita, ka taea te whakahaere i ngā mahi aunoa katoa pērā i te nekehanga o te papa mahi toki porowhita, te whakamātautau, me te tuku raraunga. Ka taea e ia te whakahaere tere i ngā whakamātautau pakeke Rockwell (hei tauira, HRC) i runga i ngā paparanga pakeke o ngā wāhanga rerekē o te toki porowhita.
Ka whakamahia he pūnaha whakahaere hiko kati-porowhita mō te uta me te whakamātautau, ka tino aunoa tēnei kaiwhakamātautau mā te pātene kotahi (ko te whakatata atu ki te mahi, te tono kawenga, te pupuri kawenga, te pānui, me te tuku i te mahi ka oti katoa i a ia, ka whakakore i te hapa tangata).
Ka taea e te pūnaha whakakī i te toki crankshaft te neke whakamua me te whakamuri aunoa me te ā-ringa, me ngā nekehanga maui, matau, me te ake me te iho ka taea te whiriwhiri, e taea ai te ine i tetahi wāhi o te toki crankshaft.
Mā te raka tūranga porowhita whiriwhiri ka taea te raka i a ia anō, ka kore ai e paheke te rauemi mahi i te wā e ine ana.
Wā tuku: Oketopa-13-2025
