Lokacin da injiniyoyi suka ƙididdige sassa na injin ƙarfe na ƙarfe don tsarin na'ura mai aiki da karfin ruwa, bawul ɗin mai, ko taro masu nauyi masu nauyi, ba kawai zaɓin abu bane - suna yin fare akan kwanciyar hankali a ƙarƙashin matsi na mashaya 300+, juriya ga gajiya bayan hawan hawan 10⁶, da rashin haƙuri ga micro-shrinkage a cikin mahimmancin rufewa. Shi ya sa manyan OEMs a Arewacin Amurka da Turai ba sa samar da ductile iron sassa masana'anta masana'anta ta catalog-sun duba tsarin sarrafa simintin gyaran kafa, tabbatar da daidaiton nodularity a tsakanin zafi, da kuma inganta machining-jawo saura danniya profiles kafin sanya hannu POs.
QINGDAO QIANGSENYUAN TECHNOLOGY CO., LTD. yana aiki da irin wannan kayan aiki-ISO-certified, yashi-da-zuba jari-iya yin simintin, tare da CNC sel calibrated zuwa ±2 µm maimaitawa a kan fasali karkashin 0.5 mm bango kauri. Mun machined a kan 17,000 ductile baƙin ƙarfe gidaje ga piston famfo masana'antun tun 2019. A cikin kowane tsari, muna auna nodular count (ASTM A247), tensile ƙarfi (ƙananan 415 MPa), da elongation (≥10%) - ba kawai sau daya a kowace kuri'a, amma a uku axial matsayi da simintin. Me yasa? Domin yanki ɗaya da ke ƙarƙashin nodular a cikin flange na gidaje na Silinda zai iya fara yaɗuwar gajiya a 180 rpm ci gaba da aiki. Mun ga abin ya faru. Kuma mun sake fasalin tsarin gating don kawar da shi.
Haɗin kai tsaye yana raba amintattun masu samar da kayayyaki daga masu siyarwar ma'amala. A QINGDAO QIANGSENYUAN, simintin gyare-gyaren ƙarfe ba sa barin wurin har sai an duba na ƙarshe. Kayan danye ya zo da takaddun shaida: FCD450 ko FCD600 ƙarfe mai daraja, wanda za'a iya gano shi zuwa lambar zafin tanderu da binciken ladle. Ana yin simintin gyare-gyare a cikin wuraren gyare-gyaren da ake sarrafa yanayi; Ana gasa murhu zuwa ainihin ƙayyadaddun danshi (≤0.8%); An shigar da lokacin shakeout kowane zagayowar simintin. Sa'an nan kuma ya zo machining-ba a matsayin wani mataki na daban ba, amma a matsayin haɓakaccen yanayin zafi mai sarrafawa na tsari. Muna riƙe m GD&T callouts a kan concentricity (± 0.015 mm) da surface gama (Ra ≤1.6 µm) a kan sealing fuskoki saboda misalignment tsakanin bawul wurin zama da ductile baƙin ƙarfe jiki kai tsaye correlates zuwa leakage kudi a API 598 gwaji. Abokan ciniki suna aiko mana da zane-zane tare da juriya na matsayi mafi ƙarfi fiye da nasu kayan aikin taro-kuma muna saduwa da su, akai-akai.
Wasu na iya yin gardama cewa yin simintin ƙetare na ɗauke da haɗarin sarkar wadata da ba a yarda da shi ba. Amma ba a bayyana abin dogaro ta hanyar yanayin ƙasa ba - an tabbatar da shi cikin daidaiton ƙarfe. Lokacin da famfo na Turai OEM ya canza zuwa masana'antar kayan aikin ƙarfe na ƙarfe don AMS 5387 cobalt-alloy pump rotors * da * madaidaicin gidaje na ƙarfe na ƙarfe, suna buƙatar haɓaka haɓaka haɓakar thermal iri ɗaya a duk kayan biyu. Mun haɓaka ƙa'idar rigakafi ta al'ada tare da mai samar da albarkatun ƙasa-ƙara ferrosilicon ɗin da ba kasafai aka gyara ba a daidai yanayin zafi na narke-don canza yanayin halittar nodule na graphite ba tare da lalata ƙarfin ƙarfi ba. Sakamako? Daidaitaccen daidaituwa tsakanin 0.3×10⁻⁶/°C a cikin kewayon 20-200°C. Babu sake yin aiki. Babu gazawar filin. Yi aiki mai maimaitawa kawai.
Muna isar da ingantattun abubuwan ƙarfe na ƙarfe inda gazawar ba zaɓi bane: bawul ɗin matsa lamba na hawan keke sau 12 a cikin minti na shekaru 15, manyan injin injin ɗin da ke tallafawa nauyin 8-ton mai ƙarfi a cikin yanayin fesa gishiri, tushen famfo yana ɗaukar injin 300 kW akan dandamali na teku. Kowane bangare yana ɗauke da cikakken abin ganowa-lambar zafi, nazarin sinadarai, sakamakon gwajin taurin, hanyoyin haɗin rahoton CMM. Kowane jigilar kaya ya haɗa da ingantaccen girman girman abokin ciniki-babu juzu'i na farko-ba jurewar ISO ba. Idan aikace-aikacenku ya buƙaci ductile baƙin ƙarfe inji sassa factory iyawar da ke kula da ASTM A536 Grade 65-45-12 azaman mafari — ba rufi ba — kuna buƙatar ingantacciyar kulawar nodularity, ilimin tsarin aikin simintin gyare-gyaren simintin gyare-gyare, da takaddun sifili na QA. Wannan ba yaren talla ba ne. Takaddun bayanai ne da muke mika wa abokan ciniki kafin yin magana.
