KR101060114B1 - Continuous casting molds for casting molten metal, especially steel materials, into polygonal billet castings, bloom castings, preliminary section castings, etc. at high casting speeds. - Google Patents

Abstract

The present invention consists of a tube mold (2) of copper or copper alloy, wherein the inlet cross section (3) of the inlet side (4) of the tube mold (2) is enlarged in comparison with the outlet cross section (6) of the cast piece outlet side (7). A continuous casting mold for casting molten metal, in particular molten steel material, having a cross section 5 and a corner radius 8, into a polygonal billet casting, a bloom casting, a preliminary section casting 1, or the like at a high casting speed. will be. By making the internal geometric cross-sectional form 9 and the dimensions 10 assigned thereto correspond to the amount of heat of solidification that can be lost locally at the selected casting speed and to the expansion of the tube mold 2, such a continuous Casting molds can be improved process-oriented in relation to the requirements required for the cooling process.

 Continuous casting mold, tube mold, billet, bloom, preliminary section, cross section, corner radius, internal geometric cross section form, dimensions, solidification column, expansion

Description

CONTINUOUS CASTING MOLD FOR CASTING MOLTEN METALS, PARTICULARLY STEEL MATERIALS, AT HIGH CASTING RATES TO FORM POLYGONAL BILLET, BLOOM, AND PRELIMINARY SECTION CASTINGS AND THE LIKE}

The invention consists of a tubular mold of copper, the polygonal billet of molten metal, in particular molten steel material, at high casting speed, with the inlet cross section of the inlet side of the tube mold having an enlarged cross section and corner radius compared to the casting outlet side cross section. A continuous casting mold for casting into a cast piece, bloom cast piece, preliminary section cast piece, and the like.

Nearly identical continuous casting molds are known from EP 0 498 296 B2. Such continuous casting molds allow for evaluable casting cooling of the cast shell over its entire circumference through deformation of the casting cross section inside the tube mold to improve cast quality on the one hand and improve casting speed on the other hand. It is for that purpose. It should also be allowed to vary casting speeds without damaging the casting during operation. Known methods solve this goal by continually decreasing bulge-shaped cross-sectional enlargement. In the case of rod-shaped castings, at least three such bulges shall be provided over the perimeter.

Such a configuration is not limited to rod-shaped castings, but the cooling behavior of the castings, in particular, the surface quality, the structure of the structure near the edges, and the processing capacity of the billet mold cannot be determined correctly.

The performance of such billet molds is directed to achieving high surface quality at high casting speeds.

In that regard, there are difficulties in the complexity of the cooling process and on the one hand the cast pieces and on the other hand the behavior of the tube molds.

It is an object of the present invention to adapt such a tube mold of copper to suit the cooling process at a casting speed of about 3 to 10 m / min with respect to all technical requirements raised.

Such a set object is achieved in accordance with the present invention by allowing the internal geometric cross-sectional shape and the dimensions assigned thereto to be constructed in correspondence with the amount of heat of solidification that can be lost locally at the selected casting speed and in correspondence with the expansion of the tube mold. Thereby, the solidification heat is associated with the mold height (mold length) through mold expansion as well as casting shrinkage behavior during casting, to be exported correspondingly to the casting speed (fast casting speed) so that the tube mold is optimized for the process. . It is preferable that the cast piece shell always comes into contact with the inner surface (hot side) of the mold without an air gap. That is, for example, excessive heat amount in the casting meniscus zone can be taken into account together with the casting piece shrinkage and mold expansion. From such values, the internal shape and dimensions of the tube mold are constructed. Such values can be applied, for example, at mold heights of about 1000 to 1100 mm.

By allowing the shape of the mold tube to be formed at least in correspondence with the mold thermal expansion at least in the individual height zones of the tube mold, the mold tube can likewise be constructed in terms of its shape and dimensions.

According to another feature, the casting mold itself is also taken into account by allowing the tube mold to be associated with the respective steel qualities in its geometric cross sectional form.

For example, by allowing the tube mold to have a larger tapered section corresponding to a larger shrinkage of the cast piece in the region of the cast bath surface, a distinctly larger shrinkage is obtained.

에 입각하여) 테이퍼를 그 수축 섹션에 적용하게 된다.The lower part of the larger taper section allows the tube mold to consist of tapered sections that continuously change corresponding to the cast shell sheath growth and shrinkage of the cast piece, corresponding to the growth and normal shrinkage of the cast shell (t = casting time). Growth of the outer shell by S = characteristic number k

The taper is applied to the shrinking section.

According to another feature, the taper of the tube mold and its thickness are given by allowing the wall volume at the bottom of the section of the larger taper of the tube mold to be configured to vary corresponding to the amount of heat released per unit time.

In addition, by allowing the outer surface of the tube mold to be enlarged by notches, ribs, etc. in the region of decreasing wall volume, thermal expansion of the tube mold can be controlled at the outer surface.

According to another preferred feature, by having an approximately parabolic central recess for each side of the cross section starting from the inlet cross section, there is an additional advantageous influence on the behavior of the cast piece during shrinkage.

In addition, taking into account that shrinkage decreases with the thickness of the cast piece shell, measures are taken to cause the approximately parabolic recess to decrease toward the cast piece outlet side. In that case, such measures can be taken individually to each of the wide and / or narrow sides of the inlet side cross section.

In addition, it is desirable to allow the length of the approximately parabolic recess to extend to about half of the mold height, for example based on calculation.

In addition, the shrinkage behavior of the cast piece can be taken into account by making the length of the substantially parabolic recesses match the shrinkage at the respective wide side and / or narrow side heights of the mold cross section.

In addition, further improvements are realized by allowing the respective parallel parallel peripheral surfaces to be formed in the region of the corner radius opposite the corresponding corresponding peripheral surfaces in the form of internal cross sections.

An embodiment of the present invention is shown in the accompanying drawings, which will be described in more detail later. Among the accompanying drawings,

1 is a cross-sectional view of a tube mold with a diagram of solidification rows along the mold height,

FIG. 2 is a cross sectional view similar to FIG. 1;

2A is a diagram corresponding to “section A-A”,

2B is a view corresponding to “section B-B”,

3 is the same cross-sectional view as FIG.

3A is a diagram corresponding to “section A-A”,

3B is a view corresponding to “section B-B”,

4 is a cross sectional view with an approximately parabolic recess,

4A is a diagram corresponding to “section A-A”,

4B is a diagram corresponding to "section B-B".

-Explanation of Codes-

1 Polygon Billet Casting, Bloom Casting, or Preliminary Section Casting

2 tube mold 3 inlet side cross section

3a cross section side 4 injection side

5 Cross Section Zoom 6 Exit Side Cross Section

7 Casting piece outflow side 8 consecutive radius

9 Internal geometric cross section shape 10 Dimensions

11 mold height 12 mold outline

13 casting tap surface 14 first taper section

15 Second Taper Section 16 Third Taper Section

17 wall volume 18 exterior area

19 notches, ribs 20 central recess

20a length of recess 21 wide side and / or narrow side

22 Mold Cross Section 23 Face Parallel Perimeter

24 corresponding circumference

According to FIG. 1, the continuous casting mold shown in cross section serves to cast molten metal, in particular molten steel material, into polygonal billet castings, bloom castings, preliminary section castings 1 and the like. Such continuous casting molds consist of tube molds of copper or copper alloys. The inlet side cross section 3 shows a cross sectional enlargement 5 in comparison with the outlet side cross section 6 at the casting side 4 at the injection side 4. The injection side 4 and the cast piece outlet side 7 have a continuous radius 8 (see FIGS. 4A and 4B) in the corner transition zone. A diagram "D" of the transition when the solidification heat is deprived from the cast piece is shown on the right along the mold height 11. From this, a temperature trend that rises significantly in the casting hot water zone is given.

The tube mold 2 now has an amount of solidification heat (right diagram in FIG. 1) in which the internal geometric cross-sectional shape 9 and the dimensions 10 assigned thereto can be lost locally at the selected casting speed (fast casting speed). Corresponding to “D”) and correspondingly to the expansion of the tubular mold 2, ie implemented based on calculations and / or experience.

In addition, the contour 12 of the mold is reduced correspondingly to the mold thermal expansion at least in the individual height zones of the tube mold 2.

Values for expansion or contraction of the cast metal can also be taken into account in the geometric cross-sectional form 9, depending on the presentation of a given steel quality.

According to FIGS. 1 to 4, the tube mold 2 has a larger tapered section 14 in the region of the cast bath surface 13 (see FIG. 2), immediately following the casting piece 1. With a larger taper section 15 corresponding to the maximum shrinkage.

In the lower part of the larger tapered section 15 is followed by a taper 16 which is constantly changing corresponding to the cast shell sheath growth and shrinkage of the cast piece 1. In that case, the wall volume 17 is configured to change or decrease corresponding to the amount of heat taken out per unit time. In the zone where the wall volume 17 is reduced, the outer area 18 of the mold 2 is enlarged by notches, ribs 19, etc. (see FIGS. 4A and 4B). Such notches 19 are flooded with cooling medium (water) from the outside, and the notches 19 are placed in a water box (not shown) surrounding the continuous casting mold. Notches, ribs 19 and the like enlarge the cooling surface. Such notches, ribs 19 and the like can also be found in FIGS. 3 and 3B.

In Figures 4 and 4A, starting from the inlet side cross section 13, a substantially parabolic central recess 20 is provided for each cross section side 3a. Such a parabolic recess 20 is at its depth downwards towards the cast piece outlet side 7 and thus decreases in its width. In that case, the length 20a of the parabolic recess 20 extends to about half of the mold height 11. The length 20a of the parabolic recess 20 is also adjusted in accordance with the amount of shrinkage at the height of each wide side and / or narrow side 21 of the mold cross section 22 (see FIG. 4).

In the region of the corner radius 8 a face parallel circumferential surface 23 is formed extending downwards, respectively, which face parallel circumferential surface 23 is formed with a corresponding corresponding circumferential surface 24 in the inner cross-sectional form 9 respectively. Are opposed to each other.

Claims (12)

Consisting of a tube mold 2 of copper or copper alloy, the inlet cross section 3 of the inlet side 4 of the tube mold 2 being enlarged relative to the outlet cross section 6 of the cast outlet side 7. In a continuous casting mold for casting molten metal having a cross section 5 and a corner radius 8 into a polygonal billet casting, a bloom casting, and a preliminary section casting 1 at a high casting speed, The internal geometric cross-sectional shape 9 of the tube mold 2 starts from the enlarged cross-section 5 of the injection side 4 opposite the casting piece outlet side 7, and thus over the mold height 11. Change with the temperature diagram (D) with respect to and the amount of solidification heat that can be lost locally corresponding to the expansion of the tube mold, A first tapered section is provided in the region of the casting bath surface 13 on the injection side 4 so that the wall volume 17 is reduced correspondingly to the amount of heat lost per unit time and the temperature diagram D over the mold height 11. (14), and next to the first tapered section 14, there is a second tapered section 15 with a greater inclination than the first tapered section 14, and below the second tapered section 15, A third taper section 16 that continuously changes corresponding to the growth of the cast piece shell and the shrinkage of the cast piece 1 extends to the outlet cross section 6, The wall thickness of the mold decreases correspondingly to the thermal expansion of the mold according to the height of the mold, and in areas where the wall volume 17 is reduced, the outer area 18 of the mold 2 is enlarged by notches or ribs 19. Continuous casting mold, characterized in that. 2. The continuous casting mold according to claim 1, wherein the contour (12) of the tube mold decreases correspondingly to the thermal expansion of the tube mold according to the height of the tube mold (2). 2. Continuous casting mold according to claim 1, characterized in that the geometric cross-sectional shape (9) of the tube mold (2) is formed according to the steel grade of the cast metal. 2. Continuous casting mold according to claim 1, characterized in that a parabolic recess (20) is formed in the center of the cross sectional side (3a) starting at the inlet cross section (3). 5. Continuous casting mold according to claim 4, characterized in that the parabolic recess (20) decreases in depth and width toward the cast piece outlet side (7). 5. Continuous casting mold according to claim 4, characterized in that the length (20a) of the parabolic recess (20) extends to half of the tube mold height (11). 5. Continuous casting according to claim 4, characterized in that the length (20a) of the parabolic recess (20) is adjusted in accordance with the amount of shrinkage in the height of each of the wide and narrow side surfaces (21) of the mold cross section (22). template. 2. The peripheral circumferential surfaces 23 according to claim 1, wherein in the region of the corner radius 8 of the transverse side surface 3a of the inlet cross section 3 of the mold each extend downwards to the casting bath surface 13, 23 is a continuous casting mold, characterized in that it is connected to the same corresponding circumferential surface 24 starting from the casting hot water surface 13 and into the transition zone to the geometric cross-sectional shape 9. 2. A continuous casting mold according to claim 1, wherein said molten metal is steel. delete delete delete

Images