RU2198057C1 - Method for making continuous deformed hollow billets and plant for performing the same - Google Patents

Abstract

FIELD: foundry, namely metal continuous casting. SUBSTANCE: method is realized in mold having two vertical walls mounted with possibility of reciprocation motion and two other walls having inclined upper portions and mounted with possibility of rotation. In cavity of mold central core is arranged with possibility of rotation relative to walls with inclined upper portions. Skin of billet is formed only on surfaces of two wall with inclined upper portions. Mold for making continuous deformed hollow billets is mounted on platform with two windows for casting metal. There are two lugs in lower portion of platform. Central core has cylindrical opening in upper portion for passing pin designed for fastening core in lugs with possibility of core motion relative to walls with inclined upper portions. EFFECT: enhanced efficiency of process, improved quality of billets, reliable operation of plant with increased useful life period and easy maintenance. 2 cl, 3 dwg

Description

 The invention relates to foundry, in particular to continuous casting of metal.

 A known method of producing continuously cast deformed hollow billets [Patent 2136435 RU, 22 D 11/04. A method of obtaining continuously cast deformed hollow billets and a device for its implementation / V.V. Stulov, V.I. Lonely. Publ. 09/10/99. Bull. 25], including pouring liquid metal into the mold space from two sides between the central rod and its walls installed in the mold, two of which are vertical with the possibility of reciprocating motion, and the other two are inclined in the upper part with the possibility of rotational movement, liquid metal is carried out into the space between the Central rod and the vertical walls of the mold.

A disadvantage of the known method for producing continuously cast hollow billets is the production of hollow billets with a hole offset relative to the center due to opposing crystallization fronts from the side of the mold that is inclined in the upper part and the vertical walls. In addition, uneven cooling, in particular of vertical walls, leads to different thicknesses of the resulting crusts and a curvature of the central rod during deformation of the workpiece,
The inventive method is aimed at creating a highly efficient process for producing continuous deformed hollow billets.

The technical result obtained by the implementation of the proposed method is
1) increasing the productivity of the process of obtaining hollow billets;
2) improving the quality of the obtained hollow billets.

 The inventive method is characterized by the following essential features.

 Limiting signs: supply of metal into the mold space between the central rod installed in the mold and its vertical walls; two walls of the mold are made vertical with the possibility of reciprocating motion, and the other two are inclined in the upper part with the possibility of rotational motion.

 Distinctive features: the formation of a crust of the workpiece only on the surface of two walls inclined in the upper part; the central core is rotatable relative to the walls inclined in the upper part.

 A causal relationship between the totality of the essential features of the proposed method and the achieved technical result is as follows.

 The formation of the crust of the workpiece only on the surface of two walls inclined in the upper part excludes the possibility of moving the central core relative to the vertical walls due to the possible uneven growth of crusts on the walls, and accordingly, the offset of the hole relative to the center in the hollow workpiece is reduced.

 The execution of the Central core with the possibility of rotation relatively inclined in the upper part of the walls ensures its self-centering in the case of the formation of crusts of different thicknesses on each of the inclined in the upper part of the walls. As a result, the deviation from the straightness of the hole in the workpiece is reduced.

 To implement the proposed method, an installation is claimed, the prior art of which is known [Patent RU 2136435].

 A known device for producing continuously cast deformed hollow billets contains a casting container with a dosing agent and immersion cups, a water-cooled mold and a central rod installed in it, made with a conical upper and calibration lower zones, the mold is made with vertical working walls with the possibility of reciprocating movement and two inclined in the upper part of the working walls with the possibility of rotational motion, and the central rod anovlen platform with two windows for casting metal through the glasses, mounted between the central rod and the vertical walls and the platform is fastened to the fixed vertical clamping plates, which are moved relative to vertical walls.

 A disadvantage of the known device is the curvature of the central rod due to the formation of crusts of various thicknesses on the walls, which leads to the need for its alignment after casting the metal, and in some cases the replacement of the central rod.

The technical result obtained by the implementation of the inventive installation is
1) improving the reliability of the installation;
2) increasing the service life of the central rod, ease of maintenance and repair.

 The inventive installation is characterized by the following essential features.

 Restrictive signs: pouring container with a dosing agent and immersion glasses; a water-cooled mold made with vertical working walls with the possibility of reciprocating movement and two working walls inclined in the upper part with the possibility of rotational movement; a central rod installed in the mold, made with a conical upper and calibration lower zones; the central rod is mounted on a platform with two windows for pouring metal; the platform is fixed on stationary vertical clamping plates, relative to which the vertical walls move.

 Distinctive features: two eyes at the bottom of the platform; a cylindrical hole in the upper part of the central rod; finger.

 A causal relationship between the set of essential features of the claimed installation and the achieved technical result is as follows.

 The manufacture of two eyes in the lower part of the platform allows the central rod to be fixed in them with the possibility of its movement relative to the walls inclined in the upper part.

 Filling in the upper part of the central rod of the hole allows you to fix it with your finger in the eyes of the platform and rotate on the finger. In addition, there is the possibility of moving the Central rod along the length of the finger.

 In FIG. 1 shows the appearance of the inventive installation, figure 2 is a section aa in figure 1, and figure 3 is a view of the Central rod.

 The apparatus for producing continuous deformed hollow preforms in FIG. 1 and 2 consists of a casting tank 1 with a metering agent and immersion cups 2, a water-cooled mold 3 with two vertical working walls 4 and two working walls 5 inclined at the top, stationary vertical clamping plates 6 with bearings 7, a central rod 8 with a cylindrical hole 9, mounted on the platform 10 in the eyes 11 with a finger 12, two windows 13 in the platform.

 Before pouring liquid metal, a special device is installed in the lower part of the mold 3 — a seed, which prevents pouring of the melt.

 The method is carried out by the inventive installation as follows.

 Liquid metal from the casting tank 1 with a metering agent through immersion glasses passing through the windows 13 in the platform 10 enters the mold 3 from two sides between the central rod 8 and the vertical walls 4. After the melt reaches a certain level and forms a crust on the surfaces of two inclined surfaces the top of the walls 5 is activated by the drive of the mold 3. As a result, the vertical walls 4 mounted on a flat bearing 7 in the stationary pressure plates 6, perform a reciprocating movement with the expulsion of the hollow workpiece, and the working walls 5 inclined in the upper part, rotational movement with compression of the metal on the central rod 8 and gripping the workpiece. The change in the thickness of the crusts of the workpiece on the walls 5 inclined in the upper part leads to a slight rotation of the central rod 8 with an opening 9 on the finger 12 fixed in the eyes 11 of the platform 10. As a result, the central rod 8 is not curved.

Claims (2)

 1. A method for producing continuous deformed hollow billets, comprising supplying metal into the mold space between the central rod installed in it and the mold walls, the two walls of which are made vertical with the possibility of reciprocating motion, and the other two are inclined in the upper part with the possibility of rotational movement, characterized in that the formation of the crust of the workpiece is carried out only on the surfaces of two walls inclined in the upper part, and the central rod is made with the ability to rotate relatively inclined in the upper part of the walls.  2. Installation for producing continuous deformed hollow billets, containing a casting container with a dosing agent and immersion cups, a water-cooled mold made with vertical working walls with the possibility of reciprocating movement and two working walls inclined in the upper part with the possibility of rotational movement, the central rod, made with a conical upper and lower calibration zones and installed in the mold on a platform with two windows for filling me alla, wherein the platform is fastened to the fixed vertical clamping plates, which are moved relative to the vertical walls, characterized in that the bottom of the platform are made two lugs, and the upper portion of the central rod is cylindrical opening for passage of a finger.

Images