RU2434710C1 - Vertical semi-continuous tube casting machine - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Proposed machine comprises ladle 16, crucible 1, crystalliser 2 with outer 3 and inner 4 water-cooled molds, crystalliser tilting mechanism 6, cylindrical starting bar 7 with flat, cast billet collector bowl 14 to be mounted on rotary support 16, and pull rolls 13. Basket inner surface has three longitudinal guide plates 15 arranged at 120°. Starting bar head section 8 are provided with three rolls 9, 10, 11 arranged to interact with bowl plates. One of said rolls is jointed with head section 8 by spring-loaded support, while two other rolls are rigidly jointed therewith.

EFFECT: ruling out displacement of starting bar from casting axis.

2 dwg, 1 ex

Description

The invention relates to metallurgy in the field of continuous casting of metals and can be used to obtain pipe blanks from steel or cast iron.

A vertical semi-continuous casting machine for roll billets is known, consisting of a mold with a swing mechanism, a seed and a device for drawing the billet (See, for example, O. A. Baranov and others. Continuous casting of cast iron. M: Metallurgy, 1968, p. 276, fig. 101).

The disadvantages of the known machine are the complexity of the pulling mechanism, as well as the complexity of the process of removing the cast billet from the machine.

A vertical semi-continuous casting machine for steel pipe billets is known, including a bucket with molten liquid, a metal receiver, a mold with a swing mechanism, a seed, a pulling device and a receiving basket for a cast billet (see, for example, Molochnikov N.V. et al. Semi-continuous casting of steel hollow blanks. M.: Metallurgy, "Steel", 1970, No. 5, p. 416).

A disadvantage of the known machine is that when pulling the seed with the ingot can be displaced from the axis of the machine, which leads to defects in the tube billet.

The technical result of the invention is to improve the operating conditions of the machine for semi-continuous casting of metal pipe billets, increase its productivity, improve the quality of cast billets by preventing the seed and workpiece from shifting from the casting axis.

The technical result is achieved by the fact that in a vertical machine for semi-continuous casting of metal pipe billets, containing a vertically located bucket with a melt, a metal receiver, a mold with a swing mechanism, a seed, a pulling device and a receiving basket for the cast billet, three longitudinal guide plates are made on the inner surface of the basket located at an angle of 120 °, and on the head of the seed are placed with the possibility of interaction with the plates three rollers, while one of the rollers mounted on the seed on a spring-loaded support, and the other two are rigidly connected to it.

The invention is illustrated by the following graphic materials, where:

figure 1 shows a diagram of a vertical machine for semi-continuous casting of metal pipe blanks;

figure 2 shows the arrangement of the guide plates and rollers (section aa in figure 1).

A vertical machine for semi-continuous casting of metal pipe billets comprises a metal receiver 1 supplying molten metal to the mold 2, the working annular cavity of which is formed by the outer and inner water-cooled sleeves 3 and 4, respectively.

The mold 2 is equipped with a liquid metal level gauge 5 and a swing mechanism 6.

The seed 7 in its head part 8 is equipped with rollers 9, 10 and 11, the axis of rotation of which are directed tangentially to the longitudinal axis of the seed 7.

The rollers 9 and 10 are rigidly mounted on the head part 8, and the roller 11 is mounted on a spring-loaded support 12, which allows them to be prevented from jamming during rotation.

The pulling stand contains two pairs of drive rolls 13. The seed 7 has a cylindrical shape with a flat, eliminating the rotation of the seed in the rolls of the pulling stand.

Between the mold 2 and the pulling rollers 13 is a receiving basket 14. On the inner surface of the basket 14 there are three longitudinal guide plates 15 in exact accordance with the position of the rollers 9, 10 and 11 on the head of the seed 8.

This arrangement of the rollers 9, 10 and 11 in constant contact with the guide sections 15 allows the seed 7 at any time to be strictly along the axis of the basket 14 and, therefore, along the axis of the casting.

The receiving basket 14 is mounted on a rotary support 16 and is rigidly fixed along the axis of the semi-continuous casting machine.

Liquid metal for feeding into the metal receiver 1 is located in the bucket 17.

Machine semi-continuous casting of metal pipe billets works as follows. When preparing the machine for casting, the pulling rollers 13 feed the seed 7 upwards through the receiving basket 14. Moreover, thanks to the rollers 9, 10 and 11 moving along the guide plates 15, the upper end of the head part 8 of the seed 7 without interference passes into the lower part of the mold 2. The system cooling the mold 2 include before feeding the bucket 17 with the metal to the machine.

When the melt in the mold 2 rises to the required height, the level gauge 5 gives a signal to turn on the pulling rolls 13 and, thus, to pull the seed 7 and the cast billet from the mold. The metal level in the mold 2 is maintained by controlling the rotation speed of the pulling rolls 13.

In the casting process, the mold 2 using the mechanism 6 performs a reciprocating motion with an amplitude of 1 ... 8 mm and with a frequency of 1 ... 400 1 / s. The speed of drawing the workpiece is 1 ... 5 m / min. When pulling the seed 7 and the cast billet, the rollers 9, 10 and 11 are in constant contact with the guide plates 15 of the receiving basket 14, which ensures the movement of the seed with the workpiece strictly along the casting axis.

After receiving the workpiece of the desired length, the melt supply to the crystallizer 2 is stopped, and the workpiece moving downward leaves it. In the process of further drawing, the head part 8 of the seed 7 together with the workpiece lowers to the bottom of the receiving basket 14, where the head part 8 is separated from the seed 7. Then, the movable support 16 is hydraulically rotated, and the basket 14 with the casted workpiece enters the discharge zone.

Consider a specific example of the proposed device.

On a vertical semi-continuous casting machine, cast iron billets are cast, for example, with an outer diameter of 400 mm, a wall thickness of 18 mm and a length of 6300 mm. The length of the water-cooled mold is 500 mm.

The seed is made in the form of a cylinder with a diameter equal to 150 mm. Three rollers are located at an angle of 120 ° on the head of the seed, each of which has a diameter of 100 mm and a barrel length of 80 mm. In this case, one roller is mounted on the seed on a spring-loaded support, and two others are rigidly connected to it.

The diameter of the pulling rolls is 200 mm. The force of pressing the roll to the seed is 6200 kg. The receiving basket is made with a height of 6000 m and an inner diameter of 480 mm.

Three longitudinal guide plates with a width of 80 mm and a height of 5800 mm each are made on the inner surface of the basket.

The temperature of cast iron is 1350 ÷ 1370 ° C.

The technical result of the invention is achieved by the fact that in a vertical machine for semi-continuous casting of metal pipe billets containing a bucket with a melt, a metal receiver, a mold with a swing mechanism, a seed, a pulling device and a receiving basket for a cast billet, three longitudinal guide plates are made on the inner surface of the basket, located at an angle of 120 °, and on the head part of the seed, three rollers are placed with the possibility of interaction with the plates, while one of the rollers Credited seeded in the spring-loaded support and the other two are rigidly connected to it.

When the mold is filled with the melt to the level of ~ 70 mm from its upper end, the seed is pulled out and at the same time the mold oscillation mechanism is turned on. Swing mode 230-260 1 / min (depending on the speed of drawing), the amplitude of 5 mm. The speed of drawing the workpiece in the steady state is 2.4 ÷ 2.8 m / min.

In the process of drawing, the workpiece is lowered into the receiving basket, which, after casting is completed, is turned hydraulically into the unloading zone.

The present invention allows:

- to improve the operating conditions of the machine for semi-continuous casting of metal pipe billets and to increase its productivity due to the design features of the machine, ensuring the movement of the seed and the cast billet strictly along the casting axis;

- reduce the time of preparation of the machine for casting due to the exclusion of additional measures for unhindered passage of the head of the seed to the mold;

- to improve the quality of the cast tubular billet by creating conditions for uniform cooling of the ingot in the mold and, therefore, reduce the thickness difference and ovality of the billets;

- reduce the number of breaks of the crust of the ingot under the mold;

- expand the technological capabilities of the machine, allowing continuous casting of large diameter blanks and thin-walled pipes.

Claims (1)

A vertical machine for semi-continuous casting of metal pipe billets, comprising a vertically positioned bucket with a melt, a metal receiver, a mold with a swing mechanism, a seed, a pulling device and a receiving basket for the cast billet, characterized in that on the inner surface of the basket there are three longitudinal guide plates located under angle of 120 °, and three rollers are placed with the possibility of interaction with the plates on the head of the seed, with one of the rollers mounted on the seed on odpruzhinennoy support, and the other two are rigidly connected to it.

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