SU854576A1

SU854576A1 - Method of producing thin-walled castings

Info

Publication number: SU854576A1
Application number: SU792836291A
Authority: SU
Inventors: Владимир Константинович Шнитко; Георгий Павлович Борисов; Леонид Константинович Шеневидько; Анатолий Иванович Мацкул
Original assignee: Институт проблем литья АН УССР
Priority date: 1979-11-11
Filing date: 1979-11-11
Publication date: 1981-08-15

Description

(54) СПОСОБ ПОЛУЧЕНИЯ ТОНКОСТЕННЫХ ОТЛИВОК(54) METHOD FOR PRODUCING THIN WALLS

II

Изобретение относитс к литейному производству, в частности к технологическому процессу изготовлени отливок .The invention relates to foundry, in particular, to a process for the production of castings.

Известен способ получени тонкостенных отливок, включающий заливку расплава в предварительно нагретую полуформу и последующее формирование отливки смыканием полу- форм {| . There is a known method for producing thin-walled castings, including pouring the melt into a preheated half-mold and the subsequent formation of the casting by closing the semi-molds {| .

Однако практическа реализаци зтого способа затруднительна. Кроме того, качество отливок невысокое.However, the practical implementation of this method is difficult. In addition, the quality of castings is low.

Цель изобретени - упрощение процесса изготовлени тонкостеннь1х отливок и улучшение их качества.The purpose of the invention is to simplify the process of making thin-walled castings and to improve their quality.

Поставленна цепь достигаетс тем, что нагрев нижней полуформы осуществл ют до температуры на 20-50 вьше температуры солидуса заливаемого расплава, который после заливки выдерживают при этой температуре до образовани в его объеме 10-60% твердой фазы.The delivered chain is achieved by heating the bottom half-form to a temperature 20-50 times higher than the solidus temperature of the pour melt, which after pouring is kept at this temperature until 10-60% of the solid phase is formed in its volume.

Способ осуществл етс следукмцим образом.The method is carried out in the following manner.

Claims

The bottom half-form is preheated to a temperature of 2050 above the solidus of the casting agent. Then a liquid metal is poured into its working cavity, which is kept there at the indicated temperature of the lower half-form until a molten volume of 10-60% of the solid phase is formed. This greatly simplifies the manufacturing process of casting, since it ensures the stability of the amount of solids in the mill and improves the quality of the castings in connection with their shaping from a liquid-solid state. After that, the semiforne is closed. The excess metal is released into metal collectors outside the working conditions of the mold, and the molding of your casting is due to the solidification of the metal on the working surfaces of the upper half-form. After the casting has hardened, the mold is opened and the casting is removed from the upper mold half. Preheating the bottom plate and the temperature range on the ZO-SO melt solidus is not optimal because it guarantees, on the one hand, the complete filling of its narrowest sections, and on the other, it provides the most favorable conditions for stabilizing the percentage of solid phase due to small / temperature gradients in pacajfaee within U-Bo. The presence of a solid phase in the melt. within 10-60% helps to obtain a fine structure in the casting. With a lower content of it in the melt, this effect is extremely insignificant; with more than 60%, the melt loses fluidity, as a result of which the form reproduction of the casting deteriorates. According spbsobom make TOHK. AL 9 alloy wall casting with a wall thickness of 0.9 mm and a diameter of 160 mm. The bottom half-form is preheated until the solidus temperature is 23 degrees. The upper half-form has a temperature of 130 C. In the lower half of the form they wash down the melt at a temperature of 640s. After being boiled over C, the melt temperature decreases and acquires the temperature of the lower half-form, i.e. 600 C, in which about 30% of the solid phase is formed in the melt, after which the mold halves are clamped.1 In this case, an excess of megaplates from the working cavity of the mold is squeezed into the metal receiver, and after the mold halves are completely closed, the mold is solidified -op in l in its upper half. After 40 seconds, the mold is opened and the casting is removed from the upper mold half. The cycle is then repeated. The proposed method for producing thin-walled castings allows the manufacture of castings from zinc, magnesium and aluminum alloys of various sizes with a wall thickness of 0.8-1.5 mm. The expected first effect from the introduction of the proposed method, according to preliminary calculations, will be about 220 thousand rubles for one plant. per year by simplifying the process of making thin-walled castings and improving their quality. Claims The method of producing tank-wall castings, including pouring the melt into the preheated bottom mold and subsequent molding the casting by closing the molds, characterized in that, in order to simplify the process and improve the quality of castings, the bottom mold is heated to a temperature 2050 s above the solidus temperature cast the melt, which, after filling, is kept at this temperature until 1060% of the solid phase is formed in its volume. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 624713, cl. B 221) 27/12, 1976.