SU950490A1

SU950490A1 - Mould for continuous casting of hollow blanks

Info

Publication number: SU950490A1
Application number: SU813240969A
Authority: SU
Inventors: Виталий Семенович Скотаренко; Евгений Викторович Пустовалов; Вячеслав Михайлович Бударин; Игорь Иванович Хорохорин; Отари Ионович Чохонелидзе; Иван Михайлович Распопин
Original assignee: Липецкий Филиал Всесоюзного Проектно-Технологического Института Литейного Производства
Priority date: 1981-01-28
Filing date: 1981-01-28
Publication date: 1982-08-15

Description

(5) КРИСТАЛЛИЗАТОР ДЛЯ НЕПРЕРЫВНОГО ЛИТЬЯ полых ЗАГОТОВОК(5) CRYSTALIZER FOR CONTINUOUS CASTING OF CAVE Hollow Billets

1one

Изобретение относитс к литейному производству, в частности к непрерывной разливке металлов, и предназначено дл формировани полой заготовки на машинах горизонтального лить .The invention relates to foundry, in particular to the continuous casting of metals, and is intended to form a hollow billet on horizontal casting machines.

Известен кристаллизатор дл непрерывного лить полых заГОТОвок,содержащий наружную втулку и дорн. В наружной втулке выполнены подвод щие каналы дл подачи жидкого металла в ра-,Q бочую полость кристаллизатора. Формирование полого слитка осуществл етс в кольцевой полости между охлаждаемой наружной втулкой и дорном .A known mold for continuous casting hollow cores containing an outer sleeve and a mandrel. In the outer sleeve there are supply channels for the supply of liquid metal into the ra-, Q barrel cavity of the mold. A hollow ingot is formed in the annular cavity between the cooled outer sleeve and the mandrel.

Недостатком данного кристаллизато-,5 ра вл етс расположение подвод щих жидкий металл каналов в охлаждаемойнаружной втулке, что зачастую вызывает Перемерзание подвод щих каналов и, как следствие, прекращение процес- 20 са разливки.The disadvantage of this crystallizer, 5 pa is the location of the liquid metal supply channels in the cooled outer sleeve, which often causes Freezing of the supply channels and, as a result, termination of the casting process.

Наиболее близким к изобретению по технической сущности вл етс кристаллизатор , также содержащий наружнуюThe closest to the invention to the technical essence is a mold, also containing external

втулку и дорн. Подвод щие жидкий металл каналы выполнены во фланце дорна 2 .sleeve and mandrel. The liquid metal supply channels are provided in the flange of the mandrel 2.

Однако така конструкци кристаллизатора также не устран ет указанный недостаток. ;However, such a design of the mold also does not eliminate this drawback. ;

Цель изобретени - стабилизаци процесса непрерывного лить .The purpose of the invention is to stabilize the continuous casting process.

Поставленна цель достигаетс тем, что в кристаллизаторе,содержащем охлаждаемую наружную втулку и дорн с подвод щими каналами, дорн снабжен теплоизол ционным кольцом, отдел ющим его от .охлаждаемой наружной втулки, причем подвод щие камеры выполнены в теле дорна, а отношение площади поперечного сечени кристаллизатора к суммарной полости поперечных сечений подвод щих каналов 2,0-2,5.The goal is achieved by the fact that in a mold containing a cooled outer sleeve and a mandrel with supply channels, the mandrel is provided with a heat insulating ring separating it from the cooled outer sleeve, the supply chambers being made in the body of the mold to the total cavity of the cross sections of supply channels 2.0-2.5.

Claims

Liquid metal flows from the metal reservoir into the bore, and from it through the feed channels. Into the annular space between the mandrel and the outer sleeve, where the formation of a pox casting takes place. On the basis of experimental data, it was established that the ratio of the cross-sectional area of the shaping cavity and the total cross-sectional area of the supply channels should be 2.0-2.5, and the diameter of each supply channel should not be less than 8-10 mm. If this ratio is less than 2.0, the mandrel section is weakened, with the result that the mandrel may break, especially at the beginning of the casting process, since the initial extraction force, called the stall force, has a maximum value. If the ratio is greater than 2.5, this makes it difficult to fill the working cavity of the mold, which leads to a deterioration in the quality of the castings. FIG. 1 shows a crystallization unit, a transverse section; in fig. 2 shows section A-A in FIG. 1. The crystallization unit for casting hollow blanks contains a metal receiver 1, to which a water-cooled jacket 2 is attached, into the inner conical surface of which an outer sleeve 3 is inserted. In this sleeve, a mandrel k, previously assembled with an insulating ring 5, is attached rings with mandrel are made along the right-hand thread, and rings with outer sleeve along the left-hand thread. The device works as follows. 0 From the metal receiver 1, the liquid metal enters the bore, then through the channels made in the bore, into the annular space between the outer sleeve 3 and the mandrel 4, in which the hollow casting is formed. The technical and economic efficiency of the invention consists in preventing the freezing of the liquid metal supply channels and stabilizing the continuous casting process. I The invention A mold for continuous casting of hollow billets comprising a cooled outer sleeve and a mandrel with feed channels, characterized in that, in order to stabilize the continuous casting process by eliminating freezing of the liquid metal supply channels, the mandrel is provided with a heat insulating ring separating it from the cooled outer sleeve, the Inlet channels being made in the body of the mandrel, and the ratio of the cross-sectional area of the mold to the total cross-sectional area 2.0-2.5 boiling channel. Sources of information taken into account in the examination 1. Shatagin OA and others. Horizontal continuous casting of non-ferrous metals and alloys. M., 197, p. 30, Fig. b.

2. The same figure. but. - -; - --.-- r-i--: - :: -.-- -.--. . - ...-.. -. ------ .--- .--. --L-: / - -.