1. Kev txheeb xyuas tus qauv
(1) Qhov nonpauj npaim valvemuaj ib lub ncuav mog qab zib-zoo li tus qauv, lub puab kab noj hniav yog kev cob cog rua thiab txhawb nqa los ntawm 8 reinforcing ribs, sab saum toj Φ620 qhov sib txuas lus nrog lub puab kab noj hniav, thiab lwm yamvalveyog kaw, cov xuab zeb core yog ib qho nyuaj kho thiab yooj yim rau deform.Ob qhov tso pa tawm thiab kev ntxuav ntawm cov kab noj hniav hauv sab hauv coj cov teeb meem loj, raws li pom hauv daim duab 1.
Phab ntsa thickness ntawm cov castings txawv heev, lub siab tshaj plaws phab ntsa thickness mus txog 380 hli, thiab qhov tsawg kawg nkaus phab ntsa thickness tsuas yog 36 hli.Thaum lub casting yog solidified, qhov kub ntawm qhov sib txawv yog loj, thiab lub uneven shrinkage tau yooj yim tsim shrinkage kab noj hniav thiab shrinkage porosity defects, uas yuav ua rau dej seepage nyob rau hauv hydraulic xeem.
2. Txheej txheem tsim:
(1) Qhov chaw sib cais yog qhia hauv daim duab 1. Muab qhov kawg nrog qhov rau ntawm lub thawv sab saud, ua kom tag nrho cov xuab zeb core nyob rau hauv nruab nrab kab noj hniav, thiab lengthen lub taub hau tub ntxhais kom tsim nyog los pab txhawb lub fastening ntawm cov xuab zeb core thiab txav ntawm xuab zeb core thaum lub thawv tig dhau.Ruaj khov, qhov ntev ntawm lub taub hau cantilever ntawm ob qhov qhov muag tsis pom ntawm sab yog ntev dua qhov ntev ntawm lub qhov, kom qhov nruab nrab ntawm lub ntiajteb txawj nqus ntawm tag nrho cov xuab zeb core yog biased mus rau sab ntawm lub taub hau tub ntxhais kom paub tseeb tias qhov nruab nrab ntawm lub ntiajteb txawj nqus ntawm tag nrho cov xuab zeb core yog biased mus rau sab ntawm lub taub hau tub ntxhais. xuab zeb core yog tsau thiab ruaj khov.
Cov txheej txheem kaw ib nrab kaw tau txais, ∑F sab hauv: ∑F kab rov tav: ∑F ncaj = 1: 1.5: 1.3, lub sprue siv lub raj ceramic nrog ib txoj kab uas hla ntawm Φ120, thiab ob daim ntawm 200 × 100 × 40mm refractory Cov cib tau muab tso rau hauv qab kom tiv thaiv cov hlau molten los ntawm ncaj qha Rau kev cuam tshuam cov xuab zeb pwm, 150 × 150 × 40 ua npuas ncauj ceramic lim yog nruab rau hauv qab ntawm cov neeg khiav dej num, thiab 12 lub raj ceramic nrog ib txoj kab uas hla ntawm Φ30 yog siv rau. lub puab khiav mus txuas tusyees mus rau hauv qab ntawm lub casting los ntawm cov dej sau tank nyob rau hauv qab ntawm lub lim los ua ib tug hauv qab pouring tswvyim, raws li qhia nyob rau hauv daim duab 2 Essence
(3) Muab 14 ∮20 kab noj hniav cua qhov nyob rau hauv lub puab pwm, tso ib tug Φ200 xuab zeb core vent qhov nyob rau hauv nruab nrab ntawm lub taub hau tub ntxhais, tso txias hlau nyob rau hauv lub tuab thiab loj qhov chaw los xyuas kom meej sib npaug solidification ntawm lub casting, thiab siv lub graphitization expansion hauv paus ntsiab lus tshem tawm Cov pub noj riser yog siv los txhim kho cov txheej txheem tawm los.Qhov loj ntawm lub thawv xuab zeb yog 3600 × 3600 × 1000 / 600mm, thiab nws yog welded nrog 25mm tuab steel phaj kom muaj zog txaus thiab rigidity, raws li qhia hauv daim duab 3.
3. Txheej txheem tswj
(1) Kev Ua Qauv: Ua ntej ua qauv, siv tus qauv Φ50 × 50mm los ntsuas lub zog ntawm cov xuab zeb resin ≥ 3.5MPa, thiab tuav cov hlau txias thiab cov neeg khiav dej num kom paub meej tias cov xuab zeb pwm muaj lub zog txaus los cuam tshuam cov graphite tsim. Thaum cov hlau molten solidifies Chemical expansion, thiab tiv thaiv cov hlau molten los ntawm kev cuam tshuam rau qhov khiav mus ntev ua rau cov xuab zeb ntxuav.
Cov tub ntxhais ua: Cov xuab zeb core muab faib ua 8 qhov sib npaug ntawm 8 qhov kev txhawb nqa tav, uas txuas nrog hauv nruab nrab kab noj hniav.Tsis muaj lwm yam kev txhawb nqa thiab tso pa tawm tsuas yog lub taub hau nruab nrab.Yog tias cov xuab zeb core tsis tuaj yeem kho tau thiab Exhaust, cov xuab zeb core hloov chaw thiab lub qhov cua yuav tshwm sim tom qab nchuav.Vim hais tias tag nrho cheeb tsam ntawm cov xuab zeb core yog loj, nws muab faib ua yim feem.Nws yuav tsum muaj lub zog txaus thiab rigidity los xyuas kom meej tias cov xuab zeb core yuav tsis puas tom qab pwm tso tawm, thiab yuav tsis puas tom qab pouring.Deformation tshwm sim, thiaj li los xyuas kom meej lub niaj hnub phab ntsa thickness ntawm lub casting.Vim li no, peb tau tsim tshwj xeeb hauv cov pob txha tshwj xeeb, thiab khi rau ntawm cov pob txha tseem ceeb nrog txoj hlua ua pa kom kos cov pa tso pa tawm ntawm lub taub hau tub ntxhais los xyuas kom meej lub compactness ntawm cov xuab zeb pwm thaum ua cov tub ntxhais.Raws li pom hauv daim duab 4.
(4) Kaw lub thawv: txiav txim siab tias nws nyuaj rau ntxuav cov xuab zeb nyob rau hauv cov kab noj hniav ntawm tus npauj npaim valve, tag nrho cov xuab zeb core yog pleev xim rau ob txheej xim, thawj txheej yog txhuam nrog dej cawv-raws li zirconium xim (Baume degree. 45-55), thiab thawj txheej yog pleev xim rau thiab hlawv.Tom qab ziab, pleev xim rau ob txheej nrog dej cawv-raws li magnesium xim (Baume degree 35-45) los tiv thaiv cov casting los ntawm lo rau xuab zeb thiab sintering, uas tsis tuaj yeem ntxuav.Lub taub hau ntawm lub taub hau yog dai rau ntawm Φ200 steel yeeb nkab ntawm cov qauv tseem ceeb ntawm cov pob txha tseem ceeb nrog peb M25 screws, tsau thiab kaw nrog lub puab pwm xuab zeb lub thawv nrog cov hau ntswj thiab xyuas seb cov phab ntsa thickness ntawm txhua feem yog zoo li cas.
4. Melting thiab pouring txheej txheem
(1) Siv Benxi qis-P, S, Ti zoo Q14/16# npua hlau, thiab ntxiv rau ntawm qhov sib piv ntawm 40% ~ 60%;Cov kab lus xws li P, S, Ti, Cr, Pb, thiab lwm yam yog tswj nruj me ntsis hauv cov hlau seem, thiab tsis muaj xeb thiab roj, qhov sib ntxiv yog 25% ~ 40%;tus nqi rov qab yuav tsum tau muab ntxuav los ntawm kev txhaj tshuaj blasting ua ntej siv los xyuas kom meej qhov huv ntawm tus nqi.
(2) Cov khoom tseem ceeb tswj tom qab qhov cub: C: 3.5-3.65%, Si: 2.2% -2.45%, Mn: 0.25% -0.35%, P≤0.05%, S: ≤0.01%, Mg (residual): 0.035% ~ 0.05%, nyob rau hauv qhov kev pom zoo ntawm kev ua kom spheroidization, qis qis ntawm Mg (residual) yuav tsum tau noj ntau li ntau tau.
(3) Spheroidization inoculation kev kho mob: tsawg-magnesium thiab tsis tshua muaj-lub ntiaj teb spheroidizers yog siv, thiab qhov sib ntxiv yog 1.0% ~ 1.2%.Cov txheej txheem dej yaug spheroidization kev kho, 0.15% ntawm ib zaug inoculation yog them rau ntawm nodulizer nyob rau hauv qab ntawm pob, thiab spheroidization tiav.Lub slag yog subcontracted rau theem nrab inoculation ntawm 0.35%, thiab ntws inoculation ntawm 0.15% yog nqa tawm thaum lub sij hawm pouring.
(5) Tsis tshua muaj kub ceev ceev txheej txheem yog saws, lub pouring kub yog 1320 ° C ~ 1340 ° C, thiab lub sij hawm pouring yog 70 ~ 80s.Lub molten hlau tsis tuaj yeem cuam tshuam thaum lub sij hawm nchuav, thiab lub khob sprue yog ib txwm muaj tag nrho los tiv thaiv cov pa roj thiab kev koom tes los ntawm kev koom tes hauv pwm los ntawm tus khiav.kab noj hniav.
5. Casting xeem tau
(1) Kuaj lub zog tensile ntawm lub nrum kuaj thaiv: 485MPa, elongation: 15%, Brinell hardness HB187.
(2) spheroidization tus nqi yog 95%, qhov loj ntawm graphite yog qib 6, thiab pearlite yog 35%.Cov qauv metallographic tau qhia hauv daim duab 5.
(3) Tsis pom muaj qhov tsis xws luag hauv UT thiab MT thib ob qhov tsis txaus ntseeg ntawm qhov tseem ceeb.
(4) Cov tsos yog tiaj tus thiab du (saib daim duab 6), tsis muaj qhov tsis xws luag xws li xuab zeb inclusions, slag inclusions, txias kaw, thiab lwm yam., cov phab ntsa thickness yog uniform, thiab qhov ntev raws li qhov yuav tsum tau ntawm cov duab kos.
(6) 20kg / cm2 hydraulic siab kuaj tom qab ua tiav tsis pom muaj qhov xau
6. Cov lus xaus
Raws li cov yam ntxwv ntawm tus npauj npaim valve, qhov teeb meem ntawm qhov tsis ruaj khov thiab yooj yim deformation ntawm cov xuab zeb loj hauv nruab nrab thiab nyuaj xuab zeb tu yog daws los ntawm kev hais txog kev tsim cov txheej txheem kev npaj, kev tsim thiab kho cov xuab zeb core thiab kev siv cov zirconium-based coatings.Kev teeb tsa ntawm qhov qhov cua tsis txhob muaj qhov pores hauv castings.Los ntawm lub tshuab hluav taws xob tswj thiab kev khiav haujlwm, ua npuas ncauj ceramic lim tshuaj ntsuam thiab ceramic ingate thev naus laus zis yog siv los xyuas kom meej qhov purity ntawm molten hlau.Tom qab ntau yam kev kho mob inoculation, cov qauv metallographic ntawm castings thiab ntau yam Kev ua tau zoo tau mus txog cov txheej txheem ntawm cov neeg siv khoom.
Los ntawmTianjin Tanggu Dej foob valve Co., Ltd. Npauj npaim valve, rooj vag valve, Y- lim, wafer dual phaj kos valvetsim khoom.
Post lub sij hawm: Apr-29-2023