Lokacin da injiniyoyi suka ƙididdige Stellite 21 don babban sutura, kujerun bawul masu zafin jiki ko famfo nozzles, ba kawai zaɓin abu bane-suna yin fare akan kwanciyar hankali, daidaiton ƙananan ƙananan, da rashin haƙuri don bambancin tsari-zuwa-tsari. Shi ya sa ake samo asali daga gaskiya Stelite 21 masana'anta al'amura fiye da kowane lokaci. Ba kowane madaidaicin kanti ba ne zai iya ɗaukar wannan alloy na cobalt-chromium-tungsten: matsanancin taurinsa (48-55 HRC as-cast), ɗabi'ar taurin aiki, da azanci ga tarihin zafi yana buƙatar fiye da injinan CNC da rahotannin dubawa. Yana buƙatar ingantacciyar horon tsari-a faɗin simintin gyare-gyare, magani mai zafi, mashin ɗin axis da yawa, da tabbatar da yarda da GD&T.
Me yasa Stellite 21 ke kasawa a Hannun da ba daidai ba - kuma yayi Nasara Inda Ya ƙidaya
Mun gan shi sau biyu a cikin watanni 18 da suka gabata: OEM na'ura mai aiki da karfin ruwa ta Arewacin Amurka ta karɓi gidajen famfo na Stelite 21 piston tare da microcracks na saman bayan niƙa na ƙarshe. Tushen dalili? Mai siyarwar ya yi amfani da ɓangarorin simintin yashi ba tare da warwarewar bayani ba, sannan ya tura abinci mai tsauri yayin juyawa. Sakamakon ba wai kawai yatsa ba ne - ya kasance dakatarwar samarwa na mako uku da $ 220K a cikin raguwar lokaci. Stelite 21 ba "akan yi kamar bakin karfe ba." Its thermal conductivity shine 1/3 na bakin 316. Yanke sojojin sun karu ba tare da annabta ba. Rayuwar kayan aiki tana faɗuwa da kashi 60% idan kwararar sanyi ko kayan aikin lissafi ya karkata da ko da 5°. Nasarar tana farawa kafin guntu na farko ya tashi - tare da takaddun shaida (AMS 5387 ko ASTM F75), ingantattun tsarin hatsi, da rubutattun zagayowar homogenization.
Ƙarfafa Ƙarfafa Ƙarfafa Ƙarfafa Ƙarfafa Ƙarfafa Ƙarfafa Ƙarfafa Ƙarfafa Ƙarfafa Ƙwararrun Ƙwararrun Ƙwararrun Ƙwararru 21 na Gaskiya
Gaskiyar masana'anta na Stelite 21 ba kawai ta karɓi zane ba. Yana yi musu tambayoyi - sannan ya ba da sassan da ke yin aiki, ba kawai wucewa dubawa ba. Ga abin da muke tabbatarwa a kowane gini:
- Tabbataccen ɗanyen hajoji na ganowa: Kowane zafi mai yawa yana ɗaukar cikakkun certs na niƙa-ciki har da abun ciki na cobalt (≥53%), chromium (27-31%), tungsten (14-16%), da carbon (≤0.25%). Babu "kwatankwacin maki" maye gurbin.
- Sarrafa ƙarfafa simintin gyaran kafa: Simintin saka hannun jari don bututun bangon bakin ciki; centrifugal simintin gyaran kafa na silinda. Dukansu suna buƙatar madaidaicin ƙirar ƙira (1100-1200 ° C) da ƙimar sanyaya sarrafawa don guje wa rarrabuwar carbide.
- Haɗin maganin zafi: Magani annealing a 1175 ° C ± 10 ° C na 2 hours, bi da iska sanyaya-ba tanderu sanyaya-don kulle a uniform austenitic matrix kafin machining.
- Tabbatar da taswirar tauri bayan-machining: Ba kawai muna gwada wuri ɗaya ba. Gwajin Rockwell da CMM ke jagoranta a fadin shiyyoyi 9 a kowane bangare yana tabbatar da tsayuwar taurin tsakanin 48-52 HRC-babu masu wuce gona da iri sama da 55 HRC (haɗari) ko ƙasa da 46 HRC (rashin sawa).
Inda Kayayyakin Kayayyakin Kayayyakin Kayayyakin Kayayyakin Kayayyakin Kayayyakin Kayayyakin Kayayyakin Kaya suke Tsayawa—Wannan Shine Inda Takaici Ya Fara
Yawancin masu samar da kayayyaki suna ɗaukar Stellite 21 a matsayin "wani ƙaƙƙarfan gami." Amma faɗuwar duniya ta ainihi tana faruwa a mahaɗa: tsakanin karkatar da simintin gyare-gyare da jujjuyawar mashin ɗin, tsakanin karkatar da zafin jiki da kiran GD&T, tsakanin ƙarewar ƙasa da haɓakar ruwa. Misali, gidajen mu na AMS 5387 Stelite 21 famfo na silinda suna yin gwajin gani na gani na 3D * kafin* da *bayan* damuwa-taimakon damuwa-saboda ko da 0.008 mm saura damuwa yana jujjuyawa sama da iyakokin ISO 2768-mK. Muna injin duk mahimman abubuwan rufewa tare da ƙarewar lu'u-lu'u (Ra ≤0.4 µm), sannan muna inganta tare da bayanan martaba-ba duban gani ba. Kuma a-muna riƙe kowane tsari da ASTM E112 don girman hatsi (ASTM 5 mafi ƙarancin), saboda ƙananan hatsi suna haɓaka galling ƙarƙashin matsin hawan keke.
Daga Zane zuwa Bayarwa: Abin da Ake Samu
Idan aikin ku yana buƙatar abubuwan Stelite 21 - nozzles, kujerun bawul, rollers shaft na tsakiya, matosai na al'ada - kuna buƙatar fiye da ƙididdiga. Kuna buƙatar amsawar ƙira da wuri. Muna nuna kasada kafin fara kayan aiki: kaurin bango ƙarƙashin 2.5 mm a cikin simintin saka hannun jari, daftarin kusurwoyi ƙasa da 1.5°, ko haƙurin GD&T wanda ya fi ± 0.015 mm akan taurare saman. Gudun aikin mu na dogaro yana goyan bayan gudanar da samfuri (kaɗan kaɗan kamar guda 3) tare da cikakken rahoton FAI, sannan ya daidaita da tsabta zuwa raka'a 500+/wata ba tare da cancanta ba. Lokacin jagora? Makonni 12-16 don yin simintin gyare-gyare na farko, gami da NDT (UT + PT). Machined-kawai yayi odar jigilar kaya a cikin makonni 6-8. Duk sassa na jigilar kaya tare da cikakken ganowa: lambar zafi, jefa kuri'a, log ɗin zagayowar zafi, rahoton CMM, da taswirar tauri.
Stelite 21 ba game da farashi ba ne - game da sakamako ne. Fashewar toshe a cikin mai da iskar gas ba da'awar garanti ba ne. Lamarin tsaro ne. Matsakaicin jinkiri don abin hawa injiniyoyi ba jadawali ba ne. Abu ne da aka rasa. Zabar dama Stelite 21 masana'anta yana nufin zabar abokan hulɗa waɗanda ke ɗaukar ƙarfe a matsayin aikin injiniya-ba saye ba. Wanene ya fahimci cewa ba a auna madaidaicin a cikin microns kadai ba, amma a cikin aikin maimaituwa a cikin dubban zagayowar matsa lamba. Wannan ba alkawari ba ne. Yana da tushe.
