Lokacin da injiniyoyi suka bayyana 17-4 PH simintin saka hannun jari don manyan bawuloli masu matsa lamba, gidajen famfo, ko shafts winch, ba kawai zaɓin abu bane - suna zaɓar ambulaf ɗin aiki. Wannan ambulaf ɗin yana buƙatar kulawa mai ƙima, daidaitaccen microstructure na martensitic, da rashin daidaituwa akan juriyar lalata bayan maganin zafi. Kadan daga tushe ne ke isar da abin dogaro. Yawancin suna kasawa a wuri ɗaya mai mahimmanci: sauyawa daga ƙirar kakin zuma zuwa juzu'i na ƙarshe a ƙarƙashin 1050°C mai ƙarfi na canji.
Me yasa 17-4 PH Zuba Jari Ya Bukaci Fiye da Kafa Kafa kawai
Mun jefa sama da 2,300 na musamman 17-4 PH sassa tun 2019 — bawuloli don manifolds na Tekun Arewa, tubalan silinda don famfunan ruwa da aka ƙididdige su zuwa mashaya 420, da na'urori na tsakiya don ma'adinan abin hawa. Abin da muka koya cikin sauri: nasara ta dogara ne akan abubuwan da ba za a iya sasantawa ba - ba biyu ba, ba hudu ba.
Na farko, dole ne a iya gano albarkatun ƙasa fiye da takaddun shaida na niƙa. Muna gwada kowane zafi mai yawa don abun ciki na delta ferrite kafin zuba. Me yasa? Domin> 0.8% delta ferrite a cikin jihar as-cast yana haifar da amsawar tsufa mara daidaituwa yayin jiyya na H900-kuma hakan yana kashe rayuwar gajiya a cikin abubuwan juyawa.
Na biyu, bayanin martabar harsashin harsashi dole ne ya dace da lanƙwan faɗaɗa thermal alloy. Madaidaicin 1100°C riƙon yana aiki don 316-amma 17-4 PH yana buƙatar matakan ramping (120°C/h zuwa 950°C, sannan 60°C/h zuwa 1050°C) don gujewa microcracking a farkon 2mm na filin simintin. Mun ga wannan da idon basira lokacin da wani abokin ciniki ya zana "kama" ya kasa gwajin gwajin gishiri-gishiri bayan yin aiki: tushen tushen harsashi ne, ba maganin zafi ba.
Na uku, taimakon danniya bayan simintin ba abu ne na tilas ba — wajibi ne *kafin* kowane injina. Damuwar da ba a warware ta ba a cikin 17-4 PH yana gurbata yayin ayyukan CNC, musamman a cikin gidaje na bakin ciki-bango tare da kiran GD&T mai ƙarfi fiye da ± 0.025 mm. Muna amfani da yanayin sanyin iska 620°C/2hr nan da nan bayan girgizawa. Tsallake shi yana ƙara juzu'i 12-18% a binciken ƙarshe.
Abin da Ya Keɓance Gaskiyar 17-4 PH Zuba Jari Na Gaskiya Banda
Wasu masu samar da kayayyaki suna yiwa kansu lakabin “na musamman” saboda sun mallaki layin harsashi yumbu. Ƙwarewa na gaske yana nunawa inda wasu suka yanke sasanninta:
- Pre-zuba karfe bita: Muna bincika ƙayyadaddun ƙayyadaddun ma'aunin tsufa na abokin ciniki na H900 akan ainihin bayanan tensile daga zafi biyar ɗin mu na ƙarshe-ba kawai madaidaicin ka'ida ba.
- Tabbatarwar CMM a cikin tsari a matakai uku: Bayan m machining (don kama murdiya), bayan gama machining (don GD&T yarda), da kuma bayan karshe passivation (don tabbatar da ingancin saman).
- Babu “daidaitacce” zazzage zagayawa: Kowane bangare yana samun lokacin jiƙa na al'ada bisa ga mafi ƙanƙan ɓangaren sa - ƙididdigewa ta amfani da bayanan hardenability na Jominy, ba nau'ikan ginshiƙi ba.
Wannan horo ya fi dacewa ga sassa masu aiki kamar gidaje na piston famfo. Ɗaya daga cikin OEM na Turai ya ba da rahoton 40% tsawon rayuwar sabis bayan canzawa daga simintin 17-4 PH na mai gasa zuwa namu - ba saboda taurin mafi girma ba, amma saboda ƙananan ƙarancin mu ya rage ƙaddamarwar micro-crack a ƙarƙashin hawan keke.
Fa'idar Haɗin Kai Tsaye Ba Zaku Iya Fitar da Ku ba
Zuba jari kadai baya bada garantin aiki. Haƙiƙanin ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙaƙƙarfar ƙugiya ce tsakanin simintin gyare-gyare da injina. Mun ga lokuta da yawa inda daidaitaccen simintin 17-4 PH bawul ɗin jiki ya faɗi yayin juyawa saboda injin ya yi amfani da na'urar sanyaya abin da bai dace da tsohuwar microstructure ba-ko mafi muni, ya tsallake matakin daidaitawar cryogenic na ƙarshe.
Kayan aikinmu yana ɗaukar cikakken sarkar: ƙirƙira harsashi, zubar da injin-taimaka, sanyaya mai sarrafawa, warware matsalar, tsufa H900, CNC milling da juyawa, electropolishing, da gwajin leak helium - duk ƙarƙashin rufin ISO 9001: 2015 guda ɗaya. Babu masu maganin zafi na ɓangare na uku. Babu shagunan plating na waje. Babu canje-canjen kayan aiki da ba za a iya gano su ba.
Wannan iko yana ba da sakamako mai maimaitawa. Domin AMS 5387 cobalt alloy nozzles, mun cimma ± 0.015 mm bango kauri daidaito a fadin 120 mm tsawo. Domin T800-tushen famfo aka gyara, muna kula da Ra ≤ 0.4 µm surface gama a ciki kwarara hanyoyin-mahimmanci ga cavitation juriya.
Zaɓan Masana'antar Simintin Zuba Jari na 17-4 PH: Tambayoyi uku waɗanda ke Bayyana Gaskiya
Kafin shiga NDA, tambayi waɗannan-ba a jere ba, amma baya-baya:
- "Nuna mani gundumomin ku na ƙarshe na 17-4 PH na maganin zafi na sassa masu kauri fiye da 50 mm. Haskaka ƙimar ramp ɗin, lokutan riƙewa, da matsakaicin sanyaya da aka yi amfani da su."
- "Mene ne iyakar abin da aka yarda da ku na lalata intergranular (kowace ASTM A262 Practice E) don maganin H900-17-4 PH - kuma ta yaya kuke tabbatar da shi a kowane tsari?"
- "Idan zane na yayi kira ga ASME B16.34 Class 900 matsa lamba, menene tsarin aikin ku don tabbatar da matsa lamba akan labarin farko?"
Idan amsoshi sun ƙunshi "muna bin ƙa'idodin masana'antu" ko "mai samar da kayanmu yana ɗaukar wannan," tafiya. Idan sun tattara bayanan tanderu na ainihi, nuna hotuna na iyakoki na hatsi, da kuma yin la'akari da bayanan hydrotest na cikin gida-ci gaba da magana.
QINGDAO QIANGSENYUAN TECHNOLOGY CO., LTD. yana aiki da sadaukarwar layin simintin saka hannun jari na 17-4 PH a cikin Qingdao, wanda aka inganta don sassan da ke buƙatar daidaiton tsari da daidaiton lissafi. Hanyarsu tana ɗaukar kowane simintin gyare-gyare ba a matsayin sifar ƙarfe ba-amma azaman tsarin da aka ɗora yana jira don aiwatarwa. Wannan tunanin yana raba masana'anta da abokin tarayya. Lokacin da aikace-aikacenku ke gudana a mashaya 420, yana jujjuya a 3,000 RPM, ko zaune a nutse har tsawon shekaru 25, bambancin baya cikin takaddar. Yana cikin zagayowar zafi na farko, dubawa na CMM na huɗu, da gwajin helium na ƙarshe-kowane lokaci.
