SU1044410A1 - Gate system for intramould modifying - Google Patents

Abstract

The GUTTERING SYSTEM FOR INTRAFRAMENTAL MODIFICATION, contains a stand, a parallelepiped-shaped reaction chamber and a vertical partition installed at the outlet of the reaction chamber to feed the melt from the lower part of the chamber, in order to improve the quality of the castings, it is provided with plates from light-burning material, for example, foam plastic, installed at the bottom of the chamber and its side wall from the side of the stand. 8 t

Description

This invention relates to foundry, in particular to

production of high-strength cast iron castings and can be used in mass production of machine-building castings.

Gating systems for intraform modification of cast iron in a casting mold are known, which include a stand, a reaction chamber, a slag trap, gating channels and feeders I, 2 and h.

The disadvantage of these gating systems is an insignificant degree of cleaning the melt from non-metallic inclusions, which significantly reduces the quality of the castings, especially the magnitude of the relative elongation and toughness.

The closest to the present invention is a gating system, containing one hundred, connected by an input channel to a reaction chamber in the form of a parallelepiped, in which the crushed modifier is located and a rod is installed that provides melt output in the lower part of chamber 4.

However, this gating system, when used for modifying iron-silicon-magnesium ligatures, does not provide stability. In order to obtain high-strength cast iron, as the ligatures on OSM silicon, they are prone to sintering, which makes it difficult for the first batches of molten iron to pass through the modifier layer to the outlet of the reaction chamber. Therefore, the use of this gating system requires the use of an initial cast iron melt with a relatively high temperature (more than 1480s). .

In addition, this system is characterized by insufficient cleaning of the molten iron from non-metallic inclusions, especially at the initial moment of pouring, when the runner system is not filled with iron. The removal of undissolved particles of the modifier and other non-metallic inclusions of the ji3 peak camera detracts from the quality of the castings and makes it necessary to install (and additional slag-trapping elements

The purpose of the invention is to improve the quality of castings.

This goal is achieved by the fact that the gating system for intra-modifying, containing one hundred, a parallelepiped-shaped reaction chamber and a vertical partition installed at the outlet of the reaction chamber for feeding the melt from the bottom of the chamber, is equipped with plates of easily flammable material, for example polystyrene foam, mounted on the bottom of the chamber and its side wall from the side.

The drawing shows a diagram of the proposed device.

One hundred and one connects the input feed 2 to the reaction chamber, in which the crushed modifier 3 is located and a rod 4 is installed, which ensures that the molten iron melts through the lower part of chamber 5, at the bottom of the chamber and on its side wall adjacent to the input channel, there are plates 6 and 7 of polystyrene foam.

The initial cast iron melt, the passage through the hundred and inlet feeder, gets into the reaction chamber, in which the modifier of a certain fractional composition of the Burnout is located polystyrene foam plates, the molten iron in a short period of time reaches the outlet opening, formed ow ets and choke.

Thus, throughout the whole process, the modifier is located in the upper part of the reaction chamber, which is constantly filled and ensures that non-dissolving modifier pieces and other non-metallic inclusions are not removed to the casting. The use of the gating system, which contributes to the effective capture of non-metallic inclusions, allows us to significantly improve the quality of the metal produced, to reduce the metal intensity by eliminating additional slag-trapping elements, as well as to increase the effective area of the tooling. This gating system also provides effective interaction of the melt with the modifier due to a more developed surface than in the known gating system.

Example. Model tooling is used, which makes it possible to manufacture samples for impact tests of 10-10 "50 mm in size by modifying in a mold in an amount of 50 pcs. It should be noted that the method of obtaining samples makes it possible to divide the molten iron in the course of pouring into 5 portions. To obtain high-strength cast iron, nodular graphite from the original melt (3.65 carbon), 1.73 silicon, 0.58 manganese, 0.06 sulfur, 0.08 phosphorus, and 0.08 chromium, iron-magnesium-magnesium ligature (.7 , 0 mg) in the amount of 1.8% of 6m of the metal form. Source temperatures

The molten iron in all cases is constant and constitutes. The contamination of the fractures of the samples with non-metallic inclusions is estimated based on their number and size.

The test results of known and proposed gating systems are shown in the table.

2.5

, 03 2.45

4 2,6 2,0

Offered 1

0.50 0.54

2 0.40

4.03

4 0.43

5 0.51

The results obtained indicate an insignificant degree of purification of the iron melt using the known gating system. A particularly large removal of undissolved particles of the modifier and non-metallic inclusions from the reaction chamber is observed at the first time point of pouring. And in 3 cases and 5 fills known

gating system did not work, i.e. the melt stream could not pass through the modifier layer.

The use of the proposed system allows, without the use of additional slag-trapping elements, to produce cast iron with a good degree of purity in all portions of the pig iron melt, which significantly increases the plastic properties of the metal. The most appropriate areas of application for the gating system proposed are the manufacture of engineering castings. .

The technical and economic effect of applying the proposed gating system by reducing its metal content and increasing the useful area of the model equipment is more than 30 rubles. per ton of good to pour.

Claims (1)

A GATEWAY SYSTEM FOR IN-RADIUM MODIFICATION, comprising a riser, a parallelepiped-shaped reaction chamber and a vertical partition mounted at the outlet of the reaction chamber for supplying the melt from the lower part of the chamber, characterized in that, for the purpose of improving the quality of castings, it is equipped with plates of easily burned material, for example polystyrene foam installed on the bottom of the chamber and its side wall from the riser side ..