WO1996001712A1

WO1996001712A1 - Continuous casting process

Info

Publication number: WO1996001712A1
Application number: PCT/ES1995/000083
Authority: WO
Inventors: Jesús María ANTIA GOITIA; Marcial Mugica Berroeta
Original assignee: Siderurgica Aristrain Madrid, S.L.
Priority date: 1994-07-07
Filing date: 1995-07-04
Publication date: 1996-01-25
Also published as: ES2094686A1; ES2094686B1

Abstract

With the continuous casting process it is possible to obtain a continuous billet with a cross-section of known shape like a 'dog bone', formed at the outlet of the arched chill-mold in a vertical plane. The billet is then rolled in order to obtain the desired H-shaped profile. The invention provides that the product processed in continuous casting is formed at the outlet of the chill-mold with its two planar faces arranged according to the horizontal faces corresponding to the internal and external radii of the continuous casting and facing the operator. Since the higher and lower faces are planar faces, the spraying with cooling water and the cutting of the billet by oxicutting are optimized.

Description

CONTINUOUS COLADA PROCESS OBJECT OF THE INVENTION

The present invention, as expressed in the statement of this specification, refers to a continuous casting process, with which highly advantageous characteristics are achieved in relation to the current casting processes.

The billet shape obtained according to the invention has characteristics that differentiate it from the others known to date, since in the traditional system called "beam-blank" it is processed in continuous casting so that the flat faces are at the side and depressions in the upper or lower part, with a shape known as "dog bone". It is an object of the invention to achieve the desired product with less powerful equipment and therefore:

- Investment savings.

- Energy savings.

Fans are not needed to expel the spray water, with the consequent savings also in investments, energy and maintenance.

BACKGROUND OF THE INVENTION Currently and because the billet shape obtained with the traditional system called "beam-blank" has flat faces on the sides and depressions on the top and bottom, corresponding to the output of The ingot mold, where it follows an arched path in a vertical plane, it is not possible to achieve high-rise billets without resorting to a continuous casting model of a higher range, therefore requiring a large equipment and equipped with a greater radius of curvature than the current one, as well as more powerful straightening and extraction equipment, etc.

In a continuous casting obtained in conventional ovens, it would not be possible to process a billet 420 mm high by 300 mm. wide, without varying the equipment, apart from the fact that the quality of material due is not achieved, since other factors also intervene, among which we can highlight the following: The billet spray water for cooling it , it is difficult to evacuate uniformly, being necessary to mount fans with important air jets and thus prevent water from running through the upper face of the processed billet since it becomes a water conduit channel. Despite this, this upper face with channel functions is exposed to cooling that frequently causes problems.

The operation of chopping the billet, through oxycutting, is also problematic as having to follow the nozzle a path close to and parallel to the sinuous profile of this upper face, difficult to maintain.

DESCRIPTION OF THE INVENTION

In general, the continuous casting process, which constitutes the object of the invention, obtains the billet with its horizontal flat faces and more specifically in the internal and external radius of the continuous arched path casting.

With this form of casting it is achieved that the billet has measures more in line with the profile that is laminated, being able to process billets with larger profiles in the same continuous casting.

With the continuous casting equipment that is normally available and only changing position and carrying out reforms in the process equipment, the billet of 420 x 300 x 300 can be processed and therefore of identical dimensions to those previously mentioned in the BACKGROUND OF THE INVENTION.

The billet is subsequently laminated to obtain the desired "H" shaped profile. The two flat faces of the processed product in continuous casting are horizontal and facing the operator.

With the new continuous casting process, the spray water can be perfectly controlled and by not finding grooves or paths where it runs easily, one falls. Once the mission of refrigeration is accomplished. In this way it is possible to obtain the highest quality of the material. The cutting operation of the billet by flame cutting, is simplified since being the upper flat face, the distance from the nozzle to the billet is easy to maintain.

Therefore, the traditional beam-blank system of casting vertically, horizontally, is changed.

To facilitate the understanding of the features of the invention and forming an integral part of this specification, some sheets of drawings are attached in whose figures, for illustrative and non-limiting purposes, the following has been represented:

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1. It is a cross section of the billet obtained by the traditional system called ¬ beam-blank, with the flat faces at the side. Figure 2. It is a view similar to Figure 1, of the billet obtained in accordance with the invention, with the flat faces in the internal and external radius of the continuous casting.

Figure 3.- Shows the section of a high-rise billet, which cannot be processed with normal extraction equipment.

Figure 4.- It is a schematic and perspective view of the billet as it goes out through the nozzle following an arched path in a vertical plane, in the traditional way of processing. Figure 5.- It is a schematic sectional view of the billet obtained in accordance with the invention, located between the copper plates of the mold that provides its initial shape before rolling. Figure 6. It is a similar view of the figure

5, with the guide rollers arranged at the outlet of the ingot mold to counteract the ferrostatic pressure. DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the numbering adopted in the figures, we can see how the continuous casting process that the invention proposes, unlike the current process where the continuous billets with a section such as that shown in Figure 1 are obtained, allows obtaining a billet whose section is that of the type shown in figure 2, with the flat faces in the internal and external radius of the continuous casting. As we said before, this form of casting ensures that the billet referenced in general with the number 1 can have measures A and B more in line with the profile to be laminated.

For continuous casting process, billet 2 of Figure 3 with an A (width) measure of 300 mm. and with a height B (high) of 420 mm., it would be necessary to use equipment of larger dimensions than usual and equipped with a greater radius of curvature due to this excessive height B, being also necessary to use more powerful extraction equipment such as We talked about above.

Comparing figures 2 and 3 we can see that the same billet 2 can be achieved according to the invention only by changing the positioning and making reforms in the same process equipment.

Figure 4 shows partially the curved shape of the billet at the outlet of the cochineal. This figure clearly shows the problem referred of the evacuation of the spray water that falls on the upper face 3 in the form of a channel and according to the traditional system called beam-blank. In the continuous casting form that the invention proposes, this problem disappears since the upper face is flat, as indicated in Figure 2.

With special reference now to figures 5 and 6, we can see that the profile obtained for the billet according to the invention has the following characteristics prior to lamination:

The copper plates of the mold of Figure 5, referenced with numbers 4 and 5 are straight, or slightly concave in clear differentiation with the traditional system. The copper plates referenced with the numbers 6 and 7 are those that have the isosceles trapecial section projection with an "alpha" angle that can vary according to the previous profile to be achieved.

The shape of the previous profile for later application in the lamination has been achieved in a continuous casting designed at the time to manufacture bloons and that by the traditional system it is not possible to adapt to the new previous profiles that can be achieved with the invention, for the reasons argued when we referred to figure 3.

Figure 6 shows the guide rollers 8 and 9 at the outlet of the ingot to counteract the ferrostatic pressure.

Claims

CLAIMS 1.- CONTINUOUS COLADA PROCESS, obtaining a continuous billet with a section in the form known as "dog bone" and which is formed at the exit of the arched shell in a vertical plane, being subsequently laminated to obtain the profile in the form of "H" desired, characterized in that the product processed in continuous casting has on its two flat faces arranged according to the horizontal faces corresponding to the internal and external radii of the continuous casting and facing the operator, thus achieving with this shape strain that the billet (1) has measures more in line with the profile to be laminated; with the particularity that, when the upper and lower faces are flat, spraying with the cooling water is optimized since it does not find grooves to escape from, as well as the cutting of the billet (1) by ignoring the constant being the distance from the nozzle to the upper flat cutting face