SU846063A1 - Gate system - Google Patents

Description

(54) LITHERIC SYSTEM

I

The invention relates to foundry, in particular, to the design of gating systems for the manufacture of castings, mainly from nodular or vermicular graphite iron.

The known design of the gating system used for modifying the liquid iron with magnesium-containing additives in the form, comprising a standalone, an inlet channel and a reaction chamber 1.

The disadvantage of this design of the gating system is that stagnant zones form in the lower part of the reaction chamber, as a result of which part of the modifier does not have time to dissolve, thereby increasing the flow rate of the modifier.

The purpose of the invention is to reduce the consumption of the modifier.

The goal is achieved by the fact that the gating system, which includes, and a hundred to, the inlet channel and the reaction chamber, is equipped with a perforated tube installed in the reaction chamber perpendicular to its bottom part.

In addition, the perforated tube in its upper part is provided with a melt plug.

In this case, the tube is equipped with a heater.

In connection with the design features of the runner system, the process of mass transfer of the melt and modifier, which is in the reaction chamber, is intensified, this eliminates the formation of stagnant zones and increases the degree of utilization of the modifier, thereby reducing its consumption.

The drawing shows schematically the design of the gating system.

The casting system includes a stand-up to 1, an inlet channel 2, a reaction chamber 3. A perforated tube 4 is perpendicular to its bottom part. The perforated tube 4 is fixed perpendicular to its bottom part. It can be strengthened using special signs, a pin, etc.

For the manufacture of perforated tubes, molding or core mixture, ceramic mass, refractory clay, fireclay, magnesite, hromomagnesite, graphite, zircon, mullite are used. Depending on the grade of the alloy poured into the mold, the perforated tube can also be made of metal and coated, if necessary, with a suitable refractory material. The number, size, location of the holes in the tube, as well as the height of the tube are determined depending on the size of the reaction chamber, the number and type of modifier in it, the grade of the alloy being processed, its initial temperature and other factors. The perforated tube 4 at the top of the upper part is closed with a melted stopper 5. The stopper can be made of steel, cast iron, etc. The thickness of the stopper is selected depending on the size of the reaction chamber, the internal diameter of the tube, and the specified response time of the stopper. Heaters 6 are provided to control the temperature of the tube.

Modification of cast iron in a mold using the proposed design of the gating system is carried out as follows.

A tube 4 is fixed in the cavity of the reaction chamber 3. Thereafter, a modifier of a given composition is loaded into the reaction chamber 3. After installing the tube and filling the reaction chamber 3 with a modifier, the form is collected and the pouring begins. In the process of pouring, the melt in step 1 and inlet channel 2 enters the reaction chamber and, passing through it, gradually dissolves the modifier, and the treated metal fills the cavity of the furma. In contrast to the known constructions of the LITR system, the ligature is dissolved not only by the main horizontal melt flow, but also by the melt coming through the perforation of the tube 4. This allows uniform modifier dissolution to be achieved along the entire height of the reaction chamber; and thereby reduce the consumption of modifiers. The reaction meter at this m does not increase in size. The volume in the reaction chamber occupied by the perforated tube is negligible. It is compiled with a smaller amount of modifier loaded into the reaction chamber. A variation of co-construction using cork 5 allows more precisely and in a wider range to regulate the time the melt enters the perforated tube. When using a variant of the construction of a gating system with a proc5, dissolution of the modifier in the upper part of the gating

the system is carried out as usual. After the cork melts, the liquid iron enters the tube 4 and begins to interact with the modifier not only with the main horizontal flow, but also with the melt entering through the perforations of the perforation tube, thereby increasing the degree of dissolution of the additives and they are evenly distributed in the melt stream. The intensity of the process of interaction between the auxiliary (vertical) melt flow and the solid modifier can be adjusted within wide limits due to a change in the diameter of the tube, the size of the holes, their number and location along the height of the tube, as well as the size of the plug.

The location of the tube in the center of the reaction chamber allows for equal interaction between the melt and the additive. With optimal modification parameters (pouring temperature, composition,

sizes and quality of the modifier, dimensions of the reaction chamber, etc.) and optimal dimensions of the tube, its openings and cork, ensure continuous and uniform dissolution of the modifier during the entire casting cycle of the mold and eliminate the formation of stagnant zones in the bottom of the reaction chamber . This increases the degree of use of the modifier, thereby reducing its consumption.

Claims (3)

1. A lithium system comprising an inlet channel and a reaction chamber, characterized in that, in order to reduce the flow rate of the modifier, it is equipped with a perforated tube installed in the reaction chamber perpendicular to its bottom part. 2. System for and. 1, characterized in that the perforated tube in its upper part is provided with a melt stopper. 3. System by i. 1, characterized in that the perforated tube is provided with a heater. Information sources, taken into account during the examination 1. “Technologists and production organizations, 1976, L 3, p. 34