Lapho onjiniyela becacisa ukufakwa kwe-iron empunga kumavalvu asebenza kakhulu kahydraulic noma amaphampu ezindlu, abagcini nje ngokukhetha into ethile—babheja ukuzinza kwe-dimensional ngaphansi kwamabhayisikili ashisayo, ukusatshalaliswa kwe-graphite flake okungaguquki ezindaweni zokushisa, kanye nobuqotho bomhlaba ngemva komshini. Yingakho ukhetha okulungile inkampani ye-grey iron cast akuphathelene nezincwajana noma izitifiketi zodwa. Kumayelana nokuziphatha okuqinisekisiwe ekukhiqizweni komhlaba wangempela: indlela isisekelo esiphatha ngayo ukukhukhuleka kwezinga lokushisa ngesikhathi sokushintshwa kwamahora angu-72, noma ngabe amalogi ayo edatha yokuhlanganisa isikhunta sesihlabathi alandeleka endaweni ngayinye yokuphonsa, futhi uma isitolo sayo se-CNC singabamba u-±0.015 mm ku-320 mm bore—*ngemuva* kokukhululeka kokucindezeleka.
Sibone amaphrojekthi amaningi efa ngenxa yokuthi umphakeli uphatha insimbi empunga “njengensimbi nje ecijile”—enganaki ukuthi ukuhluka okuncane kokulingana kwekhabhoni (CE), izinga lokupholisa, noma isikhathi sokunyakazisa kuthinta ngokuqondile ukusebenza kwe-cylinder bores noma izindawo zokuvala ezivuzayo. Kwa-QINGDAO QIANGSENYUAN TECHNOLOGY CO., LTD., insimbi empunga akuyona impahla. Kuyisistimu ye-metallurgical elawulwayo. Ukulingisa kwabo kwe-QT450-10 kanye ne-GG25 kuhlaziywa nge-spectral *ngaphambi* kokuthululwa, kanti i-CE ibanjwe phakathi kwamaphoyinti angu-±0.08 kuwo wonke amaqoqo. Ukushisa ngakunye kuthwala ukulandeleka okugcwele: ilogi encibilikayo, inombolo ye-ladle, i-ID yesikhunta sesikhunta, nokuqinisekiswa kokuqina kokuqina kwe-Brinell ngemva kokwelashwa—hhayi nje isitifiketi esigxivizwe “sivumelana.”
Amandla abo alele ekuhlanganisweni okuqondile-hhayi njenge-buzzword, kodwa njengesiyalo senqubo. Izindlu zesilinda sephampu ye-piston ziqala njenge-sand-cast GG25 engenalutho, bese iqonda ngqo esitezi sazo se-ISO 9001-certified CNC ngaphandle kokuhamba phakathi kwesikhungo. Azikho izimanga zokuphinda zibambezeleke. Akukho ukuhlanganisa kahle kwesistimu phakathi kwedatha yokusakaza nokulungisa imishini. Basebenza ngomshini ubuso obubalulekile bokuvalwa endaweni eyodwa, besebenzisa ithuluzi le-Renishaw-probed offset ukuze banxephezele ubulukhuni bendawo. Yileyo ndlela eletha ngayo i-0.4 µm Ra yokuqeda endaweni yezihlalo zamavalvu—ngaphandle kokugingqika kwesibili—futhi igcina ukugxila okungu-0.02 mm phakathi kwe-bore ne-flange ekhwezayo yonkana ubude obungu-120 mm. Amakhasimende eNyakatho Melika abika ukuvuza kwenkambu okumbalwa ngo-30% ezindlini zamaphampu ezishintshwayo uma kuqhathaniswa nabahlinzeki bangaphambili—ngoba ukwakheka kwe-microstructure akuzange kuphoqe imishini enolaka edalula ukuqina komhlaba ongaphansi.
Kodwa ukuhlanganiswa kusho okuncane ngaphandle kokujula kobuchwepheshe ekuziphatheni kwe-alloy. Insimbi empunga ayihlukanisiwe lapha—yakhiwe eduze kwezinhlelo ze-cobalt-nickel. Uma ikhasimende lidinga ukuhlanganiswa okuyingxube—isibonelo, isisekelo sepompo ye-GG25 esinokufakwa kwamavalvu e-cobalt alloy AMS 5387—iqembu elifanayo likusingatha kokubili. Bayazi ukuthi i-T800's thermal expansion coefficient ingaphansi ngo-37% kune-grey iron, ngakho-ke baklama ukulingana kokuphazamiseka nemijikelezo evimbela ukuqhekeka phakathi kobuso phakathi nesevisi ku-220°C. Lokhu kukhuluma ngokushelelayo kwezinto ezihlukene kubalulekile: kuvimbela ukuklama kabusha okubizayo lapho ukungafani kokushisa kubangela ukwehluleka kwe-gasket ngaphambi kwesikhathi noma ukuguga okukhathazayo lapho kuhlangana khona. Sibabukile belungisa i-graphite morphology ngokusebenzisa isikhathi sokugoma ukuze kuthuthukiswe ukumanzisa kwamarola e-winch center shaft—ukunciphisa ukudluliswa kokudlidliza ngo-42% ekuhlolweni kwenkambu kuma-drivetrains ezimoto zobunjiniyela.
Yini ebahlukanisa nabathengisi bekhathalogi? Isikhathi sokuphendula kumpendulo yokwenziwa. Thumela umdwebo osindayo we-GD&T womzimba we-valve yokucindezela, futhi uzothola ama-PDF achazayo phakathi namahora angu-48—hhayi amanothi ajwayelekile njengokuthi “ukubekezelelana okuqinile kungenzeka,” kodwa ukubiza okuqondile: “I-Datum C kufanele isuke ku-0.3 mm ibheke ku-axis ebhokile ukuze ugweme ukuphazamiseka kwesondo lokugaya,” noma “Ukucacisa i-Rz esikhundleni sokuthi Ukulinganisa lapha kuthuthukisa izindleko zokunamathisela.” Iphrothokholi yekhwalithi yabo ayiqhutshwa ngohlu lokuhlola; ibalazwe ngengozi. Izinto ezingavuthiwe ezingenayo zithola ukuhlaziywa kokukhishwa kwenhlansi *kanye* nokuhlolwa kwe-ultrasonic kokushwabana kwangaphakathi. Ukuhlola okusacutshungulwa kusebenzisa ama-Zeiss CMM anesitayela se-ceramic esilinganiselwe—hhayi izinti ze-aluminium—ukuze i-thermal drift inganyakazi imiphumela ku-20°C ambient. Ukuhlolwa kokugcina kuhlanganisa ukuhlolwa kwengcindezi esebenzayo ku-1.5 × ingcindezi yokusebenza, nokuqinisekiswa kwe-dayi-penetrate yazo zonke izibopho ezinomshini.
Uma i-oda lakho elilandelayo lensimbi empunga lidinga okungaphezu kokuthi "lilingana futhi lingaqhekeki," bheka ubufakazi bokulawulwa kwenqubo eshumekiwe—hhayi nje ukuthobela. Bheka izitolo lapho izazi ze-metallurgists zibuyekeza imibiko yokusabalalisa okusanhlamvu kwesihlabathi ngaphambi kokwenza isikhunta, lapho abahleli bezinhlelo ze-CNC belungisa amanani okuphakelayo ngokusekelwe kumephu yesikhathi sangempela sokuqina kokusakazwa ngakunye, nalapho izinsuku zokulethwa zigxilwe ekushiseni amalogi omjikelezo—hhayi izithembiso zokuthengisa. Lokho kuyiqiniso elisebenzayo ngemuva kwezingxenye ezithembekile zokunemba. Kuzicelo ezidinga kakhulu kuma-hydraulics, uwoyela negesi, noma amasistimu ezimoto ezinzima, lokho kuvumelana akuyona inketho. Kungumehluko phakathi kokulungiswa okuhleliwe kanye nesikhathi sokuphumula esingahleliwe.
