SU628997A2

SU628997A2 - Diaphragm for separating riser from casting

Info

Publication number: SU628997A2
Application number: SU772519974A
Authority: SU
Inventors: Алексей Максимович Петриченко; Евгений Антонович Гетьман; Владимир Васильевич Колесихин; Игорь Степанович Вавилов
Original assignee: Научно-Исследовательский Институт Специальных Способов Литья
Priority date: 1977-06-27
Filing date: 1977-06-27
Publication date: 1978-10-25

Description

1one

Изобретение относитс к литейному производству .The invention relates to foundry.

По основному авт. св. № 502709 известна диафрагма, корпус которой представл ет собой цельную фигуру с полостью, заполненной экзотермической смесью и имеюпдей в центральной части сквозное отверстие дл подачи расплава при заливке и питании отливки из прибыли при кристаллизации.According to the main author. St. No. 502709 is a known diaphragm, the casing of which is a solid figure with a cavity filled with an exothermic mixture and having a through hole in the central part for feeding the melt during pouring and feeding of the casting from the profits during crystallization.

Основным недостатком известной диафрагмы вл ютс трудность изготовлени цельного, корпуса диафрагмы со сложной конфигура 1ией и внутренней полостью; значительна трудоемкость заполнени полости корпуса цельной диафрагмы экзотермической смесью; невозможность регулировани соотношени между количествами тепла , поступающими от гор щей экзотермической смеси К те„там отливки и прибыли что обусловлено тем, что корпус диафрагмы выполнен из одного материала с одинаковой теплопроводностью.The main disadvantage of the known diaphragm is the difficulty of making a solid, diaphragm body with a complex configuration and an internal cavity; the laboriousness of filling the cavity of the whole diaphragm body with the exothermic mixture is considerable; the inability to control the ratio between the amounts of heat coming from the burning exothermic mixture K those castings and profits is due to the fact that the diaphragm body is made of the same material with the same thermal conductivity.

С целью упрощени изготовлени диафрагмы и получени возможности регулировани тепла от сгорани экзотермической смеси .-корпус диафрагмы выполнен разборным в виде двух пластин и втулки; причем одна из пластин и втулка выполнены из материала , имеющего теплопроводность выще, чем материал лругой иластины.In order to simplify the manufacture of the diaphragm and to obtain the possibility of controlling the heat from the combustion of the exothermic mixture. The diaphragm case is made collapsible in the form of two plates and a sleeve; moreover, one of the plates and the sleeve is made of a material having a thermal conductivity higher than the material of the other ilastina.

На чертеже показана предлагаема диафрагма , разрез.The drawing shows the proposed diaphragm slit.

Диафрагма состоит из верхней пластины I и нижней пластины 2, которые сопр жены при помощи втулки 3, плотно установленной в посадочные гнезда пластин 1 и 2. В полости, образованной пластинами 1 и 2, размещена экзотермическа смесь.The diaphragm consists of an upper plate I and a lower plate 2, which are matched with the aid of a sleeve 3, which is tightly installed in the seating slots of plates 1 and 2. An exothermic mixture is placed in the cavity formed by plates 1 and 2.

. Верхн пластина 1 и втулка 3 могут быть изготовлены из керамики, изготовленной методом твердофазного спекани шихты следующего состава, вес.%:50 цирконового концентрата КЦ-1- 32 шамотного порошка , 2 стеарина и 16 парафина.. The top plate 1 and the sleeve 3 can be made of ceramics made by the method of solid-phase sintering of the charge of the following composition, wt.%: 50 zircon concentrate KC-1 - 32 chamotte powder, 2 stearin and 16 paraffin.

Данна керамика обладает сравнительно высокой теплопроводностью.This ceramic has a relatively high thermal conductivity.

Claims

Plate 2 can also be made in a well-known method of solid-phase sintering of ceramics with low thermal conductivity of the following composition, wt.%: 45 chamotte powder, 30 asbestos powder, 2 stearin and 16 paraffin; or from pressed glass wool with a binder of liquid glass. Packing the cavity of the diaphragm exothermic mixture is as follows. Paste exothermic mixture of known composition, wt.%; for example, 30 aluminum chips, 60 iron oxide, 10 refractory clay, 10 liquid glass from the weight of solid components are mixed for 20-25 minutes in runners, and then briquettes are formed from the mixture in the form of a ring with an inner diameter of slightly larger outer diameter of litas a new bushing of the diaphragm, and the outer diameter of the briquette corresponds to the outer diameter of the base of the diaphragm. Then the briquettes-rings from the exothermic mixture are dried at 200-240 ° C for 6 hours. The diaphragm is assembled in the following sequence. The bushing 3 is placed on the plate 2, then the briquette ring from the exothermic mixture is stirred, after which the top plate 1 is put on the sleeve. The assembled diaphragm is mixed into the mold (sand, metal, ceramic, etc.) and is placed between the working cavity and the cavity arrived. The operation of the proposed diaphragm to separate the profit from the casting with an inset of an exothermic mixture is carried out similarly to the known diaphragms. The only difference is that when using the proposed diaphragm, most of the heat flow during combustion of the exothermic mixture is directed to the zone of the feed channel and profit, and less to the zone of the upper part of the casting, which is due to the considerable thermal resistance of the material of the bottom plate of the diaphragm. compared with the material of the top plate and sleeve. This improves the conditions for feeding the metal from a profit from the casting and its directional crystallization, and therefore, the quality of the casting. The proposed construction of the diaphragm, its collapsible, greatly simplifies the operations of shaping the diaphragm body and its solid-phase sintering, facilitates the operation of stuffing an exothermic mixture into the body cavity, and consequently, improve the manufacturability of the diaphragm. Claims of the invention Diaphragm for separating profit from casting according to aut. St. No. 502709, characterized in that, in order to simplify the manufacture of the diaphragm and to control the heat from the combustion of the exothermic mixture, the diaphragm body is made collapsible in the form of two plates and a sleeve, one of the plates and the sleeve being made. than the material of another plate.

LA Y VXX X X Y X X HUOOH / X