SU948531A1 - Method of calcining moulds made with use of investment patterns - Google Patents

Method of calcining moulds made with use of investment patterns Download PDF

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Publication number
SU948531A1
SU948531A1 SU813232351A SU3232351A SU948531A1 SU 948531 A1 SU948531 A1 SU 948531A1 SU 813232351 A SU813232351 A SU 813232351A SU 3232351 A SU3232351 A SU 3232351A SU 948531 A1 SU948531 A1 SU 948531A1
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USSR - Soviet Union
Prior art keywords
calcining
shell
temperature
calcination
melted
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SU813232351A
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Russian (ru)
Inventor
Валерий Васильевич Чихачев
Борис Абрамович Кириевский
Сергей Петрович Казачков
Александр Викторович Ботте
Николай Васильевич Шипулин
Вячеслав Петрович Марфунин
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Тульский Оружейный Завод
Институт проблем литья АН УССР
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Priority to SU813232351A priority Critical patent/SU948531A1/en
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Publication of SU948531A1 publication Critical patent/SU948531A1/en

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  • Mold Materials And Core Materials (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)

Description

тоит из спекшейс  двуокиси кремни . Поэтому кислород, выдел ющийс  в пр цессе разложени  окислителей При ZOO-eOO C по данному способу,, расхо дуетс  полностью только на окисление модельных остатков в оболочке. Принима  во внимание вышеизложен ное, необходимо отметить, что эффек тивность известного способа прокали ;вани  керамической оболочки недоста точно высока . Целью изобретени   вл етс  снижение длительности и температуры прокаливани  форм. Цель достигаетс  тем, что в известном способе прокаливани  форм, получаемых по выплавл емым модел м, включающем нанесение на модельный блок многослойного покрыти , обсыпку его огнеупорным материалом, сушк оболочки, выплавление из нее модели погружение оболЬчки в насыщенный ра створ активного окислител  и прокаливание оболочки, формы при достиже нии ими в процессе прокаливани  тем пературы 500°С подвергсцот гамма-облучению . Выбор температуры, при которой производ т облучение, обусловлено тем, что повышение температуры при радиолитических процессах.разложени  углеводородов благопри тствует реакци м отрыва водорода, диссоциации углерод-углеродной св зи. Повышение температуры благопри тствует тагуке реакци м разложени  углеводородных радикалов. Чтобы термодестру ци  шла наиболее эффективно, радиоактивное облучение должно производи тьс  при температуре пор дка 500°С. При йтом гамма-излучение, воздейству  на неразложившиес  углеводородные соединени , вызывает более энергичный распад их, тем самым интенсифициру  процесс выделени  газо образных продуктов из оболочки. При температурах ниже скорост разложени  сокращаетс . Использован радиоактивного облучени  при темпе .ратурах выше неблагопри тно сказываетс  на процессах распада. так как при этих температурах уже начинает преобладать процесс синтеза углеводородов, т.е. происходит деформирование новых углеводород ных соединений. Технологическа  схема процесса осуществл етс  следующим образом. Гамма-излучение направл ют в зону прокалочной печи, где оболочки нагреваютс  до . Энерги  и активность источника .у -излучени  выбираетс  в зависимости от количества керамических форм в.поперечном сечении печи, и источник устанавливаетс  по центральной оси опок с заформованными в них оболочками, Гамма-излучение , воздейству  на керамическую форму, в состав которой.вход т высококонденсированные кремнийорганические соединени  - поликонденсаты этилсиликата () „0, поликремниевые кислоты nSiOii, двуокись кремни  5iPJ, способствует радиолитическому разложению углеводородных соединений, а именно реакции ОТрыЬа водорода, распаду углерод-углеродной св зи и отрыву молекул воды. При этом происходит интенсивное выделение газообразных продуктов,состо щих из окислов углерода и водорода,неокислившегос  сажистого углерода, различных газообразных углеводородных соединений . Неокислившиес  продукты дожигаютс  в атмосфере печи. Способ прокалки форм по изобретению выгодно отличаетс  тем, что разложение этих соединений происходит значительно интенсивное при более низких температурах (500°С) и выдержка форм в печи при требуетс  только дл  возгонки и удалени  газообразных продуктов из полости формы в атмосферу , , В таблице приведены данные по выходу , годных отливок, полученных с применением форм, изготовленных согласно изобретению и известным способом С21. Таким образом, предложенный способ обеспечивает по сравнению с прототипом получение следующих преимуществ: снижение длительности прокаливани  форм в полтора раза; снижение температуры прокаливани  форм на 100°С. Ожидаемый экономический эффект по предварительному расчету составит ISIS тыс. руб.Toit from silica speckle. Therefore, the oxygen released in the process of decomposition of oxidizing agents. With ZOO-eOO C in this method, it completely consumes only the oxidation of the model residues in the shell. Taking into account the foregoing, it should be noted that the effectiveness of the known method of calcination, the ceramic shell is not sufficiently high. The aim of the invention is to reduce the duration and temperature of calcination of the forms. The goal is achieved by the fact that in a known method of calcining molds obtained by melted models, including applying a multilayer coating to a model block, sprinkling it with refractory material, drying the shell, melting the shell from it, immersing the shell into a saturated solution of active oxidant and calcining the shell, forms, when they reach a temperature of 500 ° C during the calcination process, are exposed to gamma irradiation. The choice of the temperature at which irradiation is carried out is due to the fact that the increase in temperature during radiolytic processes. Decomposition of hydrocarbons is favored by the reaction of hydrogen separation, dissociation of the carbon-carbon bond. The increase in temperature favors the reaction by the decomposition of hydrocarbon radicals. In order for the thermal destruction of Qi to be most effective, radiation should be carried out at a temperature of about 500 ° C. In this case, gamma-radiation, acting on undecomposed hydrocarbon compounds, causes their more vigorous decomposition, thereby intensifying the process of separating gaseous products from the envelope. At temperatures below the decomposition rate is reduced. Radioactive irradiation was used at temperatures above that adversely affect decay processes. since at these temperatures the synthesis of hydrocarbons is already beginning to dominate, i.e. New hydrocarbon compounds are deformed. The process flow diagram is as follows. Gamma radiation is directed to the zone of the quenching furnace where the shells are heated to. The energy and activity of the source. Radiation is selected depending on the number of ceramic forms in the cross section of the furnace, and the source is placed along the central axis of the flasks with the shells molded into them. Gamma radiation affects the ceramic form, which contains highly condensed organosilicon compounds - ethyl silicate polycondensates () „0, polysilicic acids nSiOii, silicon dioxide 5iPJ, promotes the radiolytic decomposition of hydrocarbon compounds, namely the reaction of hydrogen, the decay of the carbon-carbon bond and the detachment of water molecules. In this case, there is an intensive release of gaseous products consisting of carbon oxides and hydrogen, non-oxidized black carbon, and various gaseous hydrocarbon compounds. Non-oxidized products are burned in the furnace atmosphere. The method of calcining the molds of the invention is advantageously characterized in that the decomposition of these compounds occurs significantly intensively at lower temperatures (500 ° C) and the holding of the molds in the furnace is required only for sublimation and removal of gaseous products from the mold cavity to the atmosphere. on output, suitable castings, obtained using molds made according to the invention and in a known manner C21. Thus, the proposed method provides, in comparison with the prototype, the following advantages: reducing the duration of calcination of the forms by one and a half times; lowering the calcination temperature of the forms by 100 ° C. The expected economic effect of a preliminary calculation will be ISIS thousand rubles.

Известный по проKnown by pro

Claims (2)

Формула изобретени Invention Formula Способ прокаливани  форм, получаемых по выплавл емым модел м, включающий нанесение на молельный блок многослойного покралти , обсыпку его 25 огнеупорным материалом, сушку оболочки , выплавление из нее моделей, погружение оболочки в насыщенный раствор активного окислител  и прокаливание оболочки, отличающийс  30 тем, что, с целью снижени  длительности и температуры прокаливани  форм.The method of calcining molds produced by the melted models, including applying a multilayer pokrat to the prayer unit, sprinkling it with 25 refractory material, drying the shell, melting the model out of it, dipping the shell into a saturated solution of active oxidant and calcining the shell, characterized in 30 in order to reduce the duration and temperature of calcination of the forms. последние при достижении ими в процессе прокаливани  температура подвергают гамма-облучению.the latter, when they reach an annealing temperature, are subjected to gamma irradiation. Источники информации, прин тые во внимание при экспертизе ; ,. 1. Шкленник Я.И. и Озеров . i Литье по выплавл емым модел м- . Инженерна  монографи . М., Машиностроение , 1971, с. 247-250.Sources of information taken into account in the examination; , 1. Shklennik Ya.I. and Ozerov. i Casting by melted model m-. Engineering monograph. M., Mechanical Engineering, 1971, p. 247-250. 2. Авторское свидетельство СССР 829316, кл. В 22 С 9/12, 1979 (прототип).2. USSR author's certificate 829316, cl. In 22 C 9/12, 1979 (prototype).
SU813232351A 1981-01-09 1981-01-09 Method of calcining moulds made with use of investment patterns SU948531A1 (en)

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