RU2456120C1 - Method of chill mould for casting mould tube - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Proposed method comprises teeming the melt into chill mould cavity, breaking the chill mould down, mould tube cast machining, turning seal grooves on tube cast, removing the bottom, heating said cast and removing inner case. Forming cavity is formed by outer case, inner case and chill mould bottom, and features shape to match that of mould tube. Melt is teemed via gate runner bottom channels. Machining of mould tube cast is made together with inner case and bottom.

EFFECT: higher efficiency.

2 cl, 2 dwg

Description

The invention relates to ferrous metallurgy, and in particular to continuous casting machines (CCM), and can be used in non-ferrous metallurgy.

As an analogue, a method for manufacturing a mold sleeve with concavities in the upper part in the form of a circle is given (US Pat. EP 0498296 B1, 2005).

The disadvantage of the analogue is that during casting, due to the high conicity and length of the section with concavities, the formed crust of a continuously cast round billet turns out to be uneven in thickness, as a result ovality of the billets occurs, the ingot shell hangs in the mold, entailing breakouts, also the sleeve is difficult to manufacture.

Known, cited as a prototype, a method of manufacturing a mold sleeve, with concavities in the upper part and a varying geometry along the length of the sleeve with at least two forming concentric sections with different tapers (Application 2006135214/02, 06.10.2006, patent RU 2308348).

The disadvantage of the prototype is that during the casting process, the forming crust of a continuously cast round billet destroys the forming concentric sections with different tapers, thereby losing the achieved initial technical effect, this sleeve is also difficult to manufacture. The sleeve in the manufacture requires initial machining of the workpiece, then at a special installation, grinding, re-machining, polishing the surface, chrome plating is performed.

The technical result of the present invention is a method and a chill mold for casting a mold sleeve in size and geometry corresponding to the parameters of the finished shell with increased resistance that does not require labor-intensive technology, while machining and other technological operations are significantly reduced.

The technical result is achieved in that the melt is poured into a mold that matches the shape of the sleeve through the cavity inside the chill mold with the melt rising to the top of the mold and forming a gate and profit.

A chill mold for casting a mold of a mold made of copper and copper alloys, comprising an outer and inner case and a bottom, in which there is a cavity for forming a mold, made in size and geometry corresponding to the parameters of the finished shell, and channels are made in the bottom, while the outer and the inner case and the bottom are connected by fastening elements to the base and traverse.

The proposed method and the chill mold for casting the mold shell are depicted in the following graphic materials, where:

- figure 1 shows a longitudinal section of the chill mold;

- figure 2 shows a section aa of figure 1.

The proposed chill mold includes an outer casing 1, an inner casing 2, a bottom 3, in which channels 4 are made, the diameter and height of the bottom 3 forming the outlet part 5 of the sleeve, the cavity 6 for forming the mold sleeve, the gate 7 in the form of a cavity inside the chill mold, base 8, traverse 9, fastening elements 10, connecting the outer 1 and inner 2 of the body and the bottom 3 with the base 8 and the traverse 9, as well as fastening elements 11, connecting the gate 7 with the traverse 9.

The claimed method and chill mold work as follows. Before pouring the melt, the chill mold is heated in the furnace to the technological temperature depending on the material (copper, copper alloy or beryllium bronze). In the heated chill mold, the molten liquid from copper, copper alloys or beryllium bronze from the intermediate ladle enters the gate 7 through channels 4 in the bottom 3, enters the cavity between the outer case 1, the inner case 2 and the bottom 3, with the melt rising to the upper part of the cavity 6 with the formation of the sprue 7 and profit, where during solidification the mold of the mold is formed. The forming cavity 6, which is formed by the outer casing 1, the inner casing 2 and the diameter and height of the bottom 3 of the output part 5 are made with high accuracy and surface cleanliness.

After cooling, the chill mold is disassembled, the fastening elements 10, 11 are removed, then the base 8, the crosshead 9, the outer case 1 and the gate 7.

The remaining mold sleeve with the inner case 2, bottom 3 is put on the machine and the profit is machined in the upper part of the sleeve and the lower part of the sprue to the size of the mold sleeve and the groove for groove sealing when installing the sleeve in the mold. Then remove the bottom 3, and the mold sleeve with the inner case 2 is heated to the process temperature and the finished mold sleeve is removed from the inner case 2.

The chill mold for casting the mold of the mold of beryllium bronze is characterized in that the forming cavities are made corresponding to the parameters of the finished mold of the mold.

The proposed sleeve is made of beryllium bronze, which has high hardness and does not require chromium plating, for example, from the MNB alloy 2.0-0.4 with dimensions: length 800 mm, outer diameter 285 mm, inner diameter 250 mm.

The liner from MNS 2.0-0.4 was tested under industrial conditions at metallurgical plants.

The proposed method and chill mold can be used in the casting of mold sleeves of round, square, rectangular polyhedral and radial shapes.

Thus, the proposed method and chill mold, with the melt being poured through the cavity inside the chill mold while performing forming cavities with parameters corresponding to the parameters of the parts of the finished beryllium bronze sleeves, allows:

- increase the accuracy of the geometry and dimensions of the finished sleeve;

- improve the quality of the surface of the sleeve;

- increase the resistance of the chill mold during casting;

- reduce the complexity of manufacturing sleeves;

- reduce the number of technological operations in the manufacture of liners;

- to increase the resistance of molded mold shells;

which, ultimately, increases the service life of the mold of the mold of beryllium bronze, provides uniform wear of the walls in comparison with the currently used sleeves of copper and copper alloys coated with chromium.

Claims (3)

1. The method of casting the mold sleeve, including the preparation of the melt, pouring it into the mold cavity of the mold, formed by the outer shell, inner shell and bottom, through the sprue through the channels made in the bottom, disassembling the mold, machining the mold of the mold shell having an inner shell and bottom , turning the grooves of the sealing grooves on the casting, removing the bottom, heating the casting of the mold sleeve and removing the inner case. 2. The method according to claim 1, characterized in that the mold sleeve is cast from beryllium bronze. 3. A chill mold for casting a mold sleeve, comprising an outer shell, an inner shell and a bottom arranged to form a mold cavity, the shape of which matches the mold of the mold, a sprue, channels for supplying the melt into said cavity, made in the bottom, base and cross beam, the outer case, the inner case and the bottom are connected by fastening elements to the base and the traverse, and the gate is connected by fastening elements to the traverse.

Images