SU818746A1

SU818746A1 - Electromagnetic pressure die casting method

Info

Publication number: SU818746A1
Application number: SU792770591A
Authority: SU
Inventors: Владислав Николаевич Фикссен; Владимир Абрамович Трефняк; Виталий Петрович Полищук; Лев Самуилович Гольдберг
Original assignee: Институт Проблем Литья Ан Украинскойсср
Priority date: 1979-05-25
Filing date: 1979-05-25
Publication date: 1981-04-07

Description

1one

Изобретение относитс к литейному производству , а именно к регулированию теплового режима литейной формы при литье под электромагнитным давлением.The invention relates to foundry, in particular, to the regulation of the thermal regime of a mold during casting under electromagnetic pressure.

Известны способы лить , включающие регулирование теплового режима кристаллизующейс отливки путем обогрева формы газом 1, электрическим током 2 или жидким теплоносителем 3.Known methods for casting include the regulation of the thermal conditions of the crystallized casting by heating the mold with gas 1, electric current 2 or heat-transfer fluid 3.

Эти способы обладают р дом недостатков . Подвод тепловой энергии через стенку литейной формы инерционен, плохо поддаетс регулировке. Применение обогрева с помощью жидкого теплоносител требует применени гидрораспределительной аппаратуры . Это увеличивает стоимость установки , снижает надежность.These methods have a number of disadvantages. The supply of heat energy through the wall of the casting mold is inertial, it is difficult to adjust. The use of heating with a heat transfer fluid requires the use of hydrodistributing equipment. This increases the cost of installation, reduces reliability.

Известно также устройство лить под электромагнитным давлением, в котором реализуетс способ лить с обогревом металла , наход щегос в металлопроводе, путем пропускани тока, протекающего в ванне магнитодинамического насоса, через металлопровод 4.It is also known to cast under electromagnetic pressure, in which the method of casting with heating metal in a metal conduit is carried out by passing a current flowing in a bath of a magnetodynamic pump through a metal conduit 4.

Регулирование теплового режима литейной формы во врем кристаллизации отливки в данном устройстве не рещаетс . При этом возможен брак отливки по воздушным раковинам, недоливам, ут жинам.The regulation of the thermal regime of the mold during the crystallization of the casting in this device is not decided. At the same time, casting can be discarded by air shells, under-pouring, and utes.

Целью изобретени вл етс регулирование теплового режима литейной формы и улучшение качества лить .The aim of the invention is to regulate the thermal conditions of the casting mold and improve the quality of the casting.

Указанна цель достигаетс тем, что поеле заполнени литейной формы измен ют напр жение или фазу одной из систем обмоток питани в пределах 10-80% от начального значени и навод т ток в металле , наход щемс в металлопроводе и питающем отливку.This goal is achieved by having the mold filling fill the voltage or phase of one of the supply winding systems within 10-80% of the initial value and induce a current in the metal in the conduit and the feed casting.

Изменение напр жени питани приводит к по влению вертикальной составл ющей электрического тока в центральном канале установки. Создав услови дл прохождени электрического тока, направленно пропускают его через кристаллизующуюс отливку, подогревают металл и регулируют тепловой режим литейной формы. Дл реализации преимуществ лить иодA change in the supply voltage leads to the appearance of a vertical component of the electric current in the central channel of the installation. By creating the conditions for the passage of electric current, it is directed to pass it through the crystallized casting, heat the metal and regulate the thermal regime of the mold. To realize the benefits of pouring iodine

низким электромагнитным давлением минимальное избыточное давление при кристаллизации не должно быть менее 0,3 атм, максимальное давление, развиваемое установкой , обычно не превышает 0,6-0,7 атм.low electromagnetic pressure minimum excess pressure during crystallization should not be less than 0.3 atm, the maximum pressure developed by the installation, usually does not exceed 0.6-0.7 atm.

Claims

A decrease in voltage or a phase change on one of the power supply inductors by 10-80% reduces the pressure by 20-30%, the current density flowing through the casting is sufficient to maintain the temperature of the crystallizing metal. When the voltage decreases or the phase changes by less than 10%, the heat output from the casting is insufficient to effectively heat the casting, and when it decreases by more than 80%, the pressure developed by the installation is less than the lower limit (0.3 atm), which is inconsistent with the conditions of electromagnetic pressure. Example. The method was dried; the installation was cast under electromagnetic pressure on the basis of the magnetodynamic pump MDN-6. The metal mold is filled with a voltage across each 50V inductor. . This creates an electromagnetic pressure of 0.5 atm. After the completion of pouring, the voltage on one inductor is reduced to within B. The electromagnetic pressure decreases to 0.3-0.4 atm, respectively, and the voltage from the vertical component of the current passes through the metal conduit, the crystallized casting, the electrical conductor and the metal bath. The magnitude of this current, depending on the decrease in the voltage on the inductor, is in the range of 500-4-1000 A, which allows the casting to be heated. The current density during its passage through the casting is higher in thin sections and lower in thicker ones. In cases where it is more convenient to carry the metal into thin sections of the casting and at the same time provide massive parts with thin sections, this method provides more heating of those volumes of the casting, i.e., thin sections that would normally crystallize first. turn. By regulating the thermal mode of the mold with a simultaneous electromagnetic action, directional solidification of the casting is achieved. This provides 8 6 obtaining a homogeneous fine structure, improving the quality of castings, reducing scrap for under-pouring, air shells, and utes. This method makes it possible to efficiently use the current circulating in the bath of a magnetodiamic pump to regulate the thermal mode of the mold, while increasing the efficiency of the installation and reliability, since there is no need for additional designs for heating the mold. The annual economic effect according to preliminary estimates is 15–20 thousand rubles. by reducing rejects by 40% for underfilling and improving the structure of castings. The invention The method of casting under electromagnetic pressure, including heating the metal in the metal pipe and filling the mold, characterized in that, in order to regulate the thermal conditions of the casting mold and improve the quality of the casting, after filling the mold, the voltage or phase of one of the supply winding systems is changed within 10-80% of the initial value and induced current in the metal in the metal conduit and feeding the casting. Sources of information taken into consideration / examination at the examination 1. USSR author's certificate No. 537752, cl. In 22D 15/00, 1974.

2. The patent of France No. 2145600, cl. At 22D 27/00, 1973.

3. The patent of France No. 2211309, cl. On 22D 27/00, 1976.

4. USSR author's certificate number 639641, cl. In 22D 27/14, 1977.