1. Tsarin bincike
(1) Wannanmalam buɗe idoyana da tsarin madauwari mai siffar cake, an haɗa rami na ciki kuma yana goyan bayan haƙarƙarin ƙarfafa 8, saman Φ620 rami yana sadarwa tare da rami na ciki, da sauranbawulan rufe shi, tushen yashi yana da wuyar gyarawa kuma yana da sauƙin lalacewa. Dukan shaye-shaye da tsaftace rami na ciki suna kawo matsaloli masu yawa, kamar yadda aka nuna a hoto na 1.
Kaurin bangon simintin gyare-gyaren ya bambanta sosai, matsakaicin kauri na bango ya kai 380mm, mafi ƙarancin kaurin bangon shine kawai 36mm. Lokacin da aka ƙarfafa simintin gyare-gyare, bambancin zafin jiki yana da girma, kuma rashin daidaituwa na raguwa zai iya haifar da raguwa da lahani na porosity cikin sauƙi, wanda zai haifar da zubar da ruwa a gwajin hydraulic.
2. Tsarin tsari:
(1) Ana nuna alamar rabuwa a cikin Hoto 1. Sanya ƙarshen tare da ramuka a kan akwatin na sama, yi cikakken yashi a cikin rami na tsakiya, da kuma tsawaita ainihin kan daidai don sauƙaƙe ɗaurin yashi da motsi na yashi lokacin da akwatin ya juya. Stable, tsawon madaidaicin ƙwanƙwasa na ramukan makafi guda biyu a gefe ya fi tsayin ramin, don haka tsakiyar nauyi na gabaɗayan yashi yana karkata zuwa gefen babban kan don tabbatar da cewa tushen yashi ya daidaita kuma ya tsaya.
An ƙaddamar da tsarin zubar da ruwa mai rufewa, ∑F ciki: ∑F a kwance: ∑F madaidaiciya = 1: 1.5: 1.3, sprue yana amfani da bututun yumbu tare da diamita na ciki na Φ120, kuma guda biyu na 200 × 100 × 40mm refractory tubalin an sanya su a ƙasan ƙarfe na ƙarfe don hana yashi kai tsaye daga mol. 150 × 150 × 40 kumfa yumbu filter an shigar da shi a kasan mai gudu, kuma ana amfani da bututun yumbu 12 tare da diamita na ciki na Φ30 don mai gudu na ciki don haɗawa daidai da kasan simintin ta hanyar tanki mai tarin ruwa a ƙasan tace don samar da tsarin zubar da ƙasa, kamar yadda aka nuna a cikin Hoto 2 Essence.
(3) Sanya 14 ∮20 ramukan iska mai zurfi a cikin mold na sama, sanya Φ200 yashi core vent rami a tsakiyar babban kai, sanya baƙin ƙarfe mai sanyi a cikin lokacin farin ciki da manyan sassa don tabbatar da daidaituwa mai ƙarfi na simintin gyare-gyare, kuma amfani da ƙa'idar fadada graphitization don soke Ana amfani da hawan ciyarwa don inganta yawan amfanin ƙasa. Girman akwatin yashi shine 3600 × 3600 × 1000/600mm, kuma an yi masa walda da farantin karfe mai kauri 25mm don tabbatar da isasshen ƙarfi da ƙarfi, kamar yadda aka nuna a hoto na 3.
3. Gudanar da tsari
(1) Modeling: Kafin yin tallan kayan kawa, yi amfani da Φ50 × 50mm misali samfurin don gwada matsa lamba ƙarfi na guduro yashi ≥ 3.5MPa, da kuma ja da sanyi baƙin ƙarfe da mai gudu don tabbatar da cewa yashi mold yana da isasshen ƙarfi zuwa biya diyya da graphite samar a lokacin da narkakkar baƙin ƙarfe solidifies Chemical, da kuma hana narkakkar da baƙin ƙarfe haifar da dogon gudu yashi.
Ƙaddamarwa: Ƙaƙwalwar yashi ya kasu kashi 8 daidai gwargwado ta 8 ƙarfafa haƙarƙari, waɗanda aka haɗa ta tsakiyar rami. Babu sauran goyon baya da sassa na shaye-shaye sai tsakiyar tsakiya. Idan ba za a iya gyara ginshiƙin yashi da Ƙarfafawa ba, ƙaurawar yashi da ramukan iska za su bayyana bayan an zubo. Domin gaba dayan yankin yashi yana da girma, an raba shi kashi takwas. Dole ne ya kasance yana da isasshen ƙarfi da ƙarfi don tabbatar da cewa ba za a lalata tushen yashi ba bayan sakin mold, kuma ba zai lalace ba bayan zubarwa. Lalacewar na faruwa, don tabbatar da kaurin bango iri ɗaya na simintin gyaran kafa. Don haka, mun yi wani ƙashi na musamman na musamman, kuma mun ɗaure shi a kan kashin tushe tare da igiyar samun iska don zana iskar gas daga ainihin kai don tabbatar da ƙarancin yashi lokacin yin ainihin. Kamar yadda aka nuna a hoto na 4.
(4) Akwatin rufewa: Idan aka yi la’akari da cewa yana da wahala a tsaftace yashi a cikin rami na ciki na bawul ɗin malam buɗe ido, an zana dukkan ginshiƙan yashi da fenti guda biyu, an goge Layer na farko da fenti na zirconium na barasa (Baume digiri 45-55), kuma an yi fenti na farko kuma an ƙone shi. Bayan bushewa, fenti na biyu tare da fenti magnesium na tushen barasa (Baume digiri 35-45) don hana simintin gyare-gyare daga mannewa ga yashi da raguwa, wanda ba za a iya tsaftacewa ba. An rataye babban ɓangaren kai a kan bututun ƙarfe na Φ200 na babban tsari na ƙashin ƙashin ƙugu tare da screws M25 guda uku, gyarawa kuma an kulle shi tare da akwatin yashi na sama na sama tare da ƙuƙuka kuma an duba ko kauri na bango na kowane bangare ya kasance daidai.
4. Tsarin narkewa da zubowa
(1) Yi amfani da Benxi low-P, S, Ti high quality-Q14/16# baƙin ƙarfe alade, kuma ƙara shi a wani rabo na 40% ~ 60%; abubuwan gano abubuwa kamar P, S, Ti, Cr, Pb, da dai sauransu ana sarrafa su sosai a cikin ƙarfe mai juzu'i, kuma ba a yarda da tsatsa da mai ba, ƙimar ƙari shine 25% ~ 40%; dole ne a tsaftace cajin da aka dawo ta hanyar fashewar harbi kafin amfani da shi don tabbatar da tsabtar cajin.
(2) Main bangaren sarrafa bayan tanderu: C: 3.5-3.65%, Si: 2.2% -2.45%, Mn: 0.25% -0.35%, P≤0.05%, S: ≤0.01%, Mg (raguwa): 0.035% na kasa da kasa da kasa iyaka ~ 0.05% Mg (raguwa) yakamata a sha gwargwadon yiwuwar.
(3) Maganin inoculation na Spheroidization: ana amfani da ƙananan-magnesium da ƙananan-ƙananan spheroidizers, kuma adadin ƙarin shine 1.0% ~ 1.2%. Hanyar flushing na al'ada maganin spheroidization, 0.15% na inoculation na lokaci ɗaya an rufe shi akan nodulizer a kasan kunshin, kuma an gama spheroidization. Sa'an nan kuma an ba da kwangilar slag don ƙaddamarwa na biyu na 0.35%, kuma ana gudanar da inoculation na 0.15% yayin zubarwa.
(5) Ana ɗaukar tsarin zubar da ƙananan zafin jiki mai sauri, yawan zafin jiki shine 1320 ° C ~ 1340 ° C, kuma lokacin zubarwa shine 70 ~ 80s. Ba za a iya katse baƙin ƙarfen da aka narkar da shi ba yayin zubarwa, kuma ƙoƙon sprue koyaushe yana cike don hana iskar gas da haɗaɗɗu daga shiga cikin ƙirar ta hanyar mai gudu. rami.
5. Sakamakon gwaji
(1) Gwada ƙarfin juzu'i na toshe gwajin simintin: 485MPa, elongation: 15%, Brinell hardness HB187.
(2) Yawan spheroidization shine 95%, girman graphite shine aji 6, kuma pearlite shine 35%. Ana nuna tsarin ƙarfe na ƙarfe a hoto na 5.
(3) Ba a sami lahani mai rikodin rikodi ba a cikin gano lahani na biyu na UT da MT na mahimman sassa.
(4) Bayyanar yana da laushi da santsi (duba Hoto na 6), ba tare da lahani na simintin gyare-gyare irin su yashi ba, ƙaddamar da slag, rufewar sanyi, da dai sauransu, kauri na bango ya kasance daidai, kuma girman ya dace da bukatun zane.
(6) 20kg/cm2 gwajin matsa lamba na hydraulic bayan aiki bai nuna wani yatsa ba
6. Kammalawa
Dangane da sifofin tsarin wannan bawul ɗin malam buɗe ido, an warware matsalar rashin ƙarfi da sauƙi na nakasar babban yashi a tsakiya da wahalar tsaftace yashi ta hanyar jaddada ƙirar tsarin aiwatarwa, samarwa da gyara ginshiƙan yashi da yin amfani da suturar tushen zirconium. Saitin ramukan huɗawa yana guje wa yiwuwar pores a cikin simintin gyare-gyare. Daga tsarin kula da cajin tanderun da tsarin mai gudu, ana amfani da allon tace yumbu da kuma fasahar ingate don tabbatar da tsabtar narkakkar ƙarfe. Bayan mahara inoculation jiyya, da metallographic tsarin na simintin gyaran kafa da kuma daban-daban The m yi ya kai daidaitattun bukatun abokan ciniki.
DagaTianjin Tanggu Water-Seal Valve Co., Ltd. Butterfly bawul, gate bawul, Y-strainer, wafer dual farantin duba bawulyi.
Lokacin aikawa: Afrilu-29-2023
