Kididdigar Lokacin sanyaya

Don hana simintin gyare-gyare daga lalacewa, fasa da sauran lahani saboda saurin sanyaya bayan an zuba, da kuma tabbatar da cewa simintin ya sami isasshen ƙarfi da ƙarfi yayin tsaftace yashi, simintin ya kamata ya sami isasshen lokacin sanyaya a cikin ƙirar. Ya kamata a tsara simintin gyare-gyare na ci gaba tare da isasshen tsawon sashin sanyaya don tabbatar da lokacin sanyaya simintin.

Lokacin sanyaya a cikin ƙirar simintin gyare-gyare yana da alaƙa da abubuwa da yawa kamar nauyin nauyi, kauri na bango, rikitarwa, nau'in gami, kaddarorin ƙira, yanayin samarwa da sauran abubuwan simintin.

一, lokacin sanyaya sassa na simintin ƙarfe a cikin yashi mold

An ƙayyade lokacin sanyaya sassan simintin ƙarfe a cikin ƙirar yashi dangane da zafin jiki lokacin cire kaya. Kuna iya komawa zuwa bayanan da ke biyowa: 300-500 ° C don yin gyare-gyare na gaba ɗaya; 200-300 ° C don simintin gyare-gyaren da ke fuskantar sanyi da lalacewa; 200-300°C don simintin gyare-gyaren da ke fuskantar zafi mai zafi Zazzagewar simintin gyare-gyare shine 800-900 ℃. Nan da nan bayan an cire kayan, cire abin hawan mai zubar da ruwa a tsaftace yashi, sa'an nan kuma sanya shi a cikin ramin yashi mai zafi ko shigar da tanda don yin sanyi a hankali.

1, The sanyaya lokaci na jefa baƙin ƙarfe sassa a cikin yashi mold yawanci za a iya zaba ta hanyar magana zuwa Table 11-2-1 da Table 11-2-3.

Tebur 11-2-1 Lokacin sanyaya na matsakaici da ƙananan simintin gyare-gyare a cikin yashi mold

Lura: Don simintin gyare-gyare tare da bango na bakin ciki, nauyi mai sauƙi da tsari mai sauƙi, lokacin sanyaya ya kamata a ɗauki ɗan ƙaramin ƙima, in ba haka ba, lokacin sanyaya ya kamata a ɗauki babban darajar.

Tebur 11-2-2 Lokacin sanyaya na manyan simintin gyare-gyare a cikin yashi

Lura: Lokacin yin ƙirar rami, lokacin sanyaya na simintin yana buƙatar ƙara da kusan 30%.

Tebur 11-2-3 Lokacin sanyaya a cikin ƙirar yashi don matsakaita da ƙananan simintin gyare-gyare a lokacin samarwa

Lura: 1. Nauyin jefawa yana nufin jimlar nauyi a cikin kowane akwati

2, Castings ana tilasta sanyaya ta samun iska a kan samar line, da sanyaya lokaci ne takaice.

Za'a iya ƙididdige lokacin sanyaya a cikin ƙira na manyan simintin ƙarfe bisa ga dabara mai zuwa.

t=vG (2-1)

a cikin dabara t ——lokacin sanyaya simintin gyare-gyare (h)

v——Yawan sanyaya simintin, ɗauki 4 ~ 8h/t

g——Nauyin simintin gyare-gyare (t)

k shine rabon nauyin simintin simintin zuwa ƙarar kwaɓen sa. Girman ƙimar k, mafi kauri kauri na bangon simintin da kuma tsayin lokacin sanyaya. Tsarin lissafin k shine

k=G/V (2-2)

a cikin dabara k——Nauyin simintin gyare-gyaren da ma'aunin juzu'insa (t/m³);

G——Nauyin jefawa (t)

V——ƙaran kwankwasa na waje a hankali (m³)

二, Lokacin sanyaya na simintin ƙarfe a cikin yashi mold

Simintin gyare-gyaren ƙarfe don tsabtace yashi na ruwa, tsabtace yashi mai fashewa da kayan aikin huhu ya kamata a sanyaya shi zuwa 250-450 ° C a cikin ƙirar yashi don girgiza. Faduwar yashi sama da 450°C na iya haifar da nakasu da tsagewar simintin gyaran kafa. Ana iya ganin lokacin sanyaya a cikin ƙirar yashi a cikin Hoto 11-2-1 da Hoto 11-2-3.

Lokacin amfani da hotuna guda uku na sama, ya kamata ku kula da waɗannan abubuwan:

(1) Lokacin da nauyin simintin ƙarfe na carbon karfe ya wuce 110t, bisa ga gano ƙimar lokacin sanyaya daidai da 110t bisa ga Hoto 11-2-2, ga kowane ƙarin 1t na nauyi, ƙara lokacin sanyaya ta 1-3h.

(2) Lokacin da nauyin ZG310-570 da simintin ƙarfe na gami ya wuce 8.5t, lokacin sanyaya za a iya ninka sau biyu idan aka kwatanta da ƙimar lokacin sanyaya na simintin ƙarfe na carbon karfe da aka samu bisa ga Hoto 11-2-1 da Hoto 11-2-2 .

(3) Simintin gyare-gyare mai kauri (kamar maƙarƙashiya, da sauransu) tare da sassauƙan siffofi da kaurin bango iri ɗaya ana iya kwance (ko pried sako-sako) 20-30% a baya fiye da lokacin sanyaya da aka ƙayyade a cikin adadi. Hakanan za'a iya sanyaya irin wannan simintin gyare-gyare a cikin ramin da aka zubar ba tare da maganin zafi a cikin tanderu ba, kuma ana ƙididdige lokacin adana zafi a matsayin 1.5-2t kowane awa 24.

(4) Don yin simintin gyare-gyare tare da hadaddun sifofi, manyan bambance-bambancen kauri na bango, kuma mai saurin fashewa, lokacin sanyaya ya kamata ya zama kusan 30% fiye da ƙimar da aka ƙayyade a cikin adadi.

(5) Don wasu simintin gyare-gyare masu kama da rami, akwatin murfin yana buƙatar cirewa a gaba ko kuma yashi ya bushe. Wannan zai ƙara yawan sanyaya, don haka ana iya rage lokacin sanyaya da 10%.

三, Mold zafin jiki na maras ƙarfe gami simintin gyaran kafa

Za a iya samun zafin gyare-gyaren simintin gyare-gyaren da ba na ƙarfe ba bisa ga Tebur 11-2-4.

Tebura 11-2-4 Zazzaɓin zafi na simintin ƙarfe mara ƙarfe