JPH0431779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for running a dummy bar head, particularly when pouring steel in a multi-continuous casting machine, and in a situation where the dummy bar head is provided with a sealing material before entering the mold. The present invention also relates to a method and a sealing device for sealing a gap between a dummy bar head and a continuous casting mold.

In the case of a continuous casting machine with a running mold, a dummy bar head connected to a dummy bar is moved into the mold before pouring begins. The gap between the dummy bar head and the mold wall is sealed with a sealant rope or plastic material, and is usually coated with particulate cooling debris. By taking such measures, the cast metal poured at the start of pouring is prevented from undesirably leaching through the gap. The sealing material itself is installed through the mold hole on the pouring side. The sealing method, which is widely used in continuous steel casting, requires additional time for sealing after inserting the dummy bar head into the mold, which reduces equipment preparation time between two pours. causes long-lasting defects. In a multi-continuous casting machine, after one strand has become sluggish, when pouring metal continuously to the remaining strands, sealing work for carrying out a new running operation cannot be carried out. This is because, on the one hand, the intermediate vessel located above the mold precludes access, and on the other hand, due to the danger of accidents, it is not allowed to work below the intermediate vessel filled with liquid steel. It is from.

In terms of quality of work, in order to eliminate manual sealing operations that basically depend on the attentiveness and skill of the worker who installs the sealing material, AT-PS (patent publication) No. 352924 and A dummy bar head equipped with a mold seal is known, and such a flat seal is inserted into a groove formed in the front end of the dummy bar head in conjunction with a leaf spring. This flat seal is attached to the dummy bar head before it is inserted into the mold. Such a method ensures that the sealing material is not destroyed on the one hand, and that no gaps are created on the other hand.
A disadvantage is the necessity of accurately centered insertion of the dummy bar head into the mold cavity.
Furthermore, to prevent the sealing material from burning, the sealing material itself must be protected from the thermal effects of the liquid steel by a layer of cold material of corresponding thickness. If both of these requirements are not met, steel may seep through the gaps during pouring, which usually results in failure of the casting.

Furthermore, from DE-OS (West German Publication No. 2811157) a method for sealing the gap between the dummy bar head and the continuous casting mold is known.
In this method, the dummy bar head is provided with a ring-shaped groove around its periphery, into which a resilient sealing material is placed before the dummy bar head enters the mold. The sealing material is tubular and can be inflated by a gaseous medium. In the case of such a sealing material, the fine particles of cold material are applied to the entire area of the elastic sealing material from the mold surface to prevent the sealing material itself from being destroyed by the inflowing steel, and/or
Otherwise, the groove must be protected from being cast in. Even with this sealing method, there is a risk of breakage during startup if the sealing material is left unattended without visually checking whether the gap above the sealing material is filled with the cold material without creating a gap. Even if such a method is adopted, it is not possible to reliably restart a multi-continuous device during continuous casting.

Purpose of the invention The present invention includes inserting a dummy bar head into a mold,
and to provide a method of sealing the gap between the dummy bar head and the mold, and to eliminate the known manual operation between the dummy bar head and the mold, and to control by visual inspection through the pouring mold hole. The purpose is to provide a sealing device that can be removed. The time required to prepare the mold before pouring begins is reduced, and in multi-continuous equipment, when continuous casting is performed with adjacent strands,
A reliable and quick restart is possible, and the dummy bar head, which has traditionally been commonly used for manual sealing, is utilized.

Structure of the Invention The first object of the present invention is to run the dummy bar head during pouring of steel in a multi-continuous casting machine in which the dummy bar head is provided with a sealing material before being fitted into the mold, and to make the dummy bar head continuously flow. In the method of sealing the gap between the dummy bar head and the casting mold, before the dummy bar head is inserted into the mold, a seal gripping part that is destroyed by the injected cast metal is set on the dummy bar head, and the dummy bar head is , with a sealing material disposed between the dummy bar head and the seal grip, which enters the mold, and then at the start of casting, the seal grip is destroyed by the injected cast metal. This is accomplished by a method of sealing the dummy bar head in a continuous casting mold. A second object of the present invention is that the sealing material is provided for sealing between the dummy bar head and the mold, especially for continuous casting equipment such as multi-continuous equipment for pouring steel. In the sealing device, on the front side of the dummy bar head facing the mold cavity of the mold, at least in the area of the sealing material edge, the sealing grip, which can be broken by the injected steel, is provided with a fixing surface for the sealing material; This is achieved by a sealing device for a dummy bar head in a continuous casting mold, characterized in that a sealing material is provided between the seal gripping portion and the dummy bar head.

DETAILED DESCRIPTION OF THE INVENTION After selecting the material for the sealing material, according to the first embodiment, the sealing material is fixed to the seal gripping part before being set on the dummy bar head, and according to the second embodiment, the sealing material is fixed to the seal gripping part before being set on the dummy bar head. After setting the seal gripping part on the holder, the sealing material is attached. The second embodiment is particularly useful when a sealing material comprising a plastic material is used. Such an anhydrous sealant plastic material can be press-inserted in the shape of a stuffing between the sealing surface on the dummy bar head and the corresponding fixing surface on the seal gripping part.

It is advantageous when the sealing material is fixed to the seal grip such that it adopts a geometrical shape and essentially matches the sealing surface of the dummy bar head. However, these points can be stably secured by utilizing a correspondence model. Furthermore, it is advantageous if the sealing material fixing surface of the sealing grip can be adapted in its geometry to the sealing surface of the dummy bar head and to the type and size of the sealing material.

It is advantageous when asbestos or a paper rope or the like is used as the sealing material, since the sealing material is joined to the seal grip.

According to another embodiment, the seal gripping part is made of an elastically deformable material, so that during the insertion run of the dummy bar head, a constant pressure is applied to the sealing material and this sealing material is again pressed against the dummy bar head sealing surface. , and the cross section of the gripping portion is preferably selected to be larger than the cross section of the mold cavity. When the dummy bar head is inserted into the mold, the seal grip and seal are deformed to a size that matches the mold cross section.

For the protection of the dummy bar head, it is proposed to fix a steel impingement plate in the injection metal impingement zone in the seal grip before inserting the head into the mold.

In order to quickly and stably fix the seal gripping part on the dummy bar head, the seal gripping part may also be provided with a gripping and centering mechanism for the dummy bar head, depending on the embodiment. Gripping/
As a centering mechanism, for example, a coupling mechanism for a dummy bar head for a pouring strand is used.

Breaking the seal grip can be accomplished in a variety of ways. If the seal grip is constructed from aluminum, the seal grip will be destroyed by melting.
At the same time, excess oxygen is removed by alumina formation. If the seal grip is constructed from a gas-performing foamed plastic, such as expanded polystyrene, these components will disappear upon gasification.

In order to obtain an ideal distribution of the cold material for coating the sealing material after the seal grip is broken, according to one embodiment, the seal grip can be configured to have a substantially pyramidal shape. This situation makes it possible to utilize granular refrigerant appropriately.

However, the seal grip may also be constructed from a variety of materials. To take one example out of a wide variety of guiding patterns, we will explain and introduce a gasifying seal gripper that is installed in combination with a thin plate piece that covers a mold wall with a sealing material. When the dummy bar head enters the mold, the thin plate slides in the longitudinal direction of the mold, which automatically eliminates the uneven gap width when viewed from the top of the mold cross section. It has the advantage that it can be deployed in a If aluminum is used for such sheet metal strips, scratches on the mold wall during running of the dummy bar head are avoided.

In multi-continuous equipment, when the cooling chambers of the individual strands are separated from each other by separating walls, immediately before the dummy bar head enters the mold,
A seal gripping part can be set in the lower area of the mold.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, which show examples according to the invention.

In FIG. 1, a dummy bar head 3 is shown in a continuous casting mold 2 and connected to a dummy bar 4 in the pouring position. A sealing material 6 in the form of a paper or asbestos rope is provided to seal between the dummy bar head 3 and the mold 2. On the front side 9 of the dummy bar head 3 facing the mold cavity 7 of the mold 2,
There is a crushable seal gripper 10 with a fastening surface 11 for the sealing material 6 . The sealing material 6 is attached to the sealing surface 13 and fixed surface 11 of the dummy bar head 3.
and the mold wall. In its geometrical form, the fixed surface 11 is
It is basically adapted to the sealing surface 13 of the dummy bar head 3 and the shape and dimensions of the sealing material 6.

The seal gripper 10 includes a portion 14 for gripping and centering the dummy bar head 3 in a dovetail-and-tenon manner. A steel collision plate 16 fixed to the seal gripping part 10 protects the part of the dummy bar head that collides with the cast metal at the start of casting. Granular cold material 17 on sealing material 6
The seal gripping portion 10 is shaped like a pyramid so that the pressure is distributed.

The seal gripper 10 provided in this example is made of a gasifying resin, such as expanded polystyrene, which gasifies under the thermal action of the inflowing cast metal. Other combustible, gasifiable, meltable materials, etc. may be used in place of polystyrene.
It is important that the connection of the dummy bar head 3 and the cast metal to be poured can be in a tensile force-transmissible connection immediately after the start of pouring.

FIG. 5 shows the state after the start of pouring in the example of FIG. 1. Due to the heat of the cast metal 100, the seal gripping part 10 is combusted, gasified, or melted, and the steel collision plate 16 and the granular cold material 17 are both melted,
Both shapes disappear, and the sealing material 6 seals the gap between the upper peripheral edge of the dummy bar head 3 and the wall surface of the mold 2, and the recess at the upper end of the dummy bar head 3 and the cast metal 100 form a dovetail-tenon type. Join.

In FIG. 2, the mold cavity 7 is shown at cross section 21.
The seal grip 20 is shown to be slightly larger than the corresponding cross section 22 of the figure. The seal 6 fixed to the seal grip 20 is covered by a sheet metal piece 24 inserted on the side 25 of the seal grip 20 facing the mold wall.

These sheet metal pieces 24, made for example of soft aluminum, can be displaced within the seal grip 20 in the direction of the arrow 27 during insertion of the dummy bar head 3, so that sufficient contact with the mold wall is ensured.

FIG. 6 shows the state after the start of pouring in the example of FIG. 2. Due to the heat of the cast metal 100, the seal gripping portion 20 burns, gasifies, or melts, and the steel collision plate 16 and the thin plate piece 24 both melt and lose their shape, and the seal material 6 becomes a dummy bar. A gap between the upper peripheral edge of the head 3 and the wall surface of the mold 2 is sealed, and the protrusion at the upper end of the dummy bar head 3 and the cast metal 100 are joined in a dovetail-tenon manner.

In FIG. 3, the seal gripper 30 is preformed from a thin plate, such as an aluminum plate. The sealing material 6, the collision plate 16, and the centering mechanism 14 are fixed to a plate-shaped seal gripping part 30. The pyramid-shaped portion 31 is optional in this case, but the sloped front end surface 3
This is only necessary if cooling is provided in the dummy bar head 33 with 4. This seal gripping part 30 is also small in cross section compared to the cross section of the mold cavity 7, as shown by the dimension arrow 36, so that the seal and the seal gripping part 30 are fixed in the mold 2 by the clamp. It is advantageous to make it larger.

FIG. 7 shows the state after the start of pouring in the example of FIG. 3. Due to the heat of the cast metal 100, the plate-shaped seal grip 30, the steel impingement plate 16 fixed thereto, and the centering mechanism 14 melt together (the optional pyramid-shaped part 31 burns, gasifies, or melts). ), their shapes disappear, and the sealing material 6 seals the upper periphery of the dummy bar head 3 and the wall surface of the mold 2 and the gap, and the recess at the upper end of the dummy bar head 3 and the cast metal 100 form a hook type. Join.

In FIG. 4, the dummy bar head 3 has a coupling part 41. For example, the planar sealing material 43 obtained from a heat-resistant textile is basically
The entire surface 44 facing the mold cavity 7 of the mold is to be covered, as well as the dummy bar head 3.
It will also cover a portion of the side interface 46 which meets said surface 44 of. In addition to its sealing function, this layered sealing material 43 also provides protection for the activation head 3, thereby prolonging the service life of such a long-life dummy bar head 3.

Metal collision plate 16 and forward projection (nose) 47
The protrusion 47 works in conjunction with the sealing material 43 to hold the seal gripping portion 40 against the dummy bar head 3.
Fixed against. A seal gripper 40 made of injection molded plastic, such as polyethylene, is hemmed into a cap over the dummy bar head. Seal gripper 40, impingement plate 16 and layered sealant 43 are typically secured facing each other before being set on the dummy bar head. Such a prefabricated sealing material unit can be manually set into the corresponding dummy bar head 3 in just a few seconds. The seal gripping portion 40 has a certain elasticity depending on the material selection and molding, so that the entire sealing material unit can be fixedly gripped on the dummy bar head 3. Due to the imparted elasticity, small dimensional differences in the various activation heads can be ignored.

FIG. 8 shows the state after the start of pouring in the example of FIG. 4. Due to the heat of the cast metal 100, the seal gripping portion 40, the steel collision plate 16, and the protrusion (nose) 47 are melted together, and the portion of the sealing material 43 on the top surface of the dummy bar head 3 is burned or gasified, and all of them are disappears, and the remaining portion of the sealing material 43 seals the upper periphery of the dummy bar head 3 and the wall surface of the mold 2, and the gap between the dummy bar head 3 and the dummy bar head 3.
The recessed joint 41 and the cast metal 100 at the upper end of the
are combined in hook format.

Another advantage of this seal gripping part 40 is that the sealing material 43 is resistant to moisture and droplets from the injection nozzle.
and to protect the dummy bar head 3 well. It goes without saying that the plastic seal grip 40 prevents direct contact between the metal part of the dummy bar head and the mold cavity 7 of the mold, thus reducing mold wear.

Layered sealant 43 can be composed of various materials. The main purpose of this sealant is to close the gap between the dummy bar head 3 and the cooling mold wall for a few seconds after pouring, in other words, until the steel hardens over the gap due to strong mold cooling. It is about closing.

Effects of the Invention The method and device according to the invention make it possible to dispense with manual sealing operations at the dummy bar head and visual inspection using the pouring side mold hole. The preparation time in the continuous casting apparatus between two casting operation points is therefore reduced. Such a sealing arrangement also makes it possible in continuous casting to restart the adjacent strand after a break in one strand of a multi-sequential device. This kind of restart is necessary during continuous casting over a long period of time.
To ensure high production efficiency even in multi-continuous equipment having small casting molds that are at risk of breakage. Previously commonly used dummy bar heads may also be used without modification. Destructible seal grippers are inexpensive to manufacture and in terms of materials.

The sealant system according to the present invention can be used in small billet molds, blooming molds, plate flat billet molds, preform molds, etc. The seal grip in the large mold can also take the form of a frame instead of the block or plate form shown by way of example, and can essentially follow the sealing surface contour. There are also no restrictions on the materials for the seal gripping part and the sealing material within the framework of the present invention.

In the case of multi-continuous casting equipment, applying the sealing method according to the present invention allows the pouring of individual strands to be intentionally interrupted or restarted to
The casting operation can be adapted to irregular steel supply which can create problems.

[Brief explanation of drawings]

Figure 1 is a vertical cross section of the mold with the dummy bar head attached, Figure 2 is a vertical cross section of the mold and starting head in another example just before the dummy bar head is inserted into the mold, and Figure 3 is a vertical cross section of the mold and starting head in another example. is a vertical cross-section of the mold and dummy bar head in yet another case immediately before inserting the starting head into the mold, FIG. 4 is a vertical cross-section of the dummy bar head in yet another case, and FIGS. Figure 6,
Figures 7 and 8 are Figures 1 and 2, respectively.
FIG. 4 is a sectional view showing the state after the start of pouring in the examples shown in FIG. 3, FIG. 4, and FIG. 2... Casting mold, 3... Dummy bar head, 4
...Dummy bar, 6...Sealing material, 7...Mold hollow chamber, 9...Dummy bar head front side, 10...Seal gripping portion, 11...Fixing surface, 13...Dummy bar head sealing surface, 14...Core Output mechanism, 16...
... Collision plate, 17 ... Cold material, 20 ... Seal gripping part, 21, 22 ... Cross section, 24 ... Thin plate piece, 25
...The side of the seal gripping part facing the mold wall, 27
...Arrow direction, 30...Seal gripping part, 31...
Pyramid-shaped part, 33...dummy bar head,
34... Inclined front end surface, 36... Dimension display arrow, 4
0...Seal gripping part, 41...Joining part, 43...
Sealing material, 44...Surface facing the mold hollow chamber, 4
5... Fixed surface, 46... Side boundary surface, 47... Protrusion (nose), 49... Sealing material edge.

Claims (1)

[Claims] 1. In a multi-continuous casting machine in which the dummy bar head is provided with a sealing material before being fitted into the mold, the dummy bar head is run during steel pouring, and the dummy bar head is moved between the dummy bar head and the continuous casting mold. In the method of sealing gaps, before the dummy bar head is inserted into the mold, a seal grip is set on the dummy bar head which is broken by the injected cast metal;
A continuous mold with a sealing material disposed between a dummy bar head and a seal grip, and then at the start of casting the seal grip is destroyed by the injected cast metal. Method of sealing dummy bar heads in casting molds. 2. The method of claim 1, wherein the sealing material is secured to the seal grip before setting the seal grip on the dummy bar head. 3. The seal gripping portion and/or the sealing material according to claim 1 or 2, characterized in that, when entering the mold, the seal gripping portion and/or the sealing material are deformed along a peripheral contour line that harmonizes with the cross section of the mold. Method. 4. Claim 1, characterized in that when the dummy bar head is inserted into the mold, the seal gripping portion is deformed by friction on the mold wall, thereby pressing the sealing material into the gap. to the method described in any one of paragraphs 3 to 3. 5. Claim 1 for pouring into a multi-continuous casting machine, characterized in that while the dummy bar head is passing into the corresponding mold of one strand, the pouring of the adjacent strand proceeds without interruption. The method described in any one of paragraphs 1 to 4. 6. A method according to any one of claims 1 to 5, characterized in that the seal grip is at least partially destroyed by melting and/or gasification. 7. A patent characterized in that the seal gripping portion is at least partially destroyed by pouring steel, thereby eliminating the coupling element in the dummy bar head for creating a bonded state with the strand by pouring the pouring steel. A method according to any one of claims 1 to 6. 8. In a sealing device for a continuous casting device, such as a multi-continuous installation for steel pouring, in which a sealing material is provided for sealing between the dummy bar head and the mold, the mold cavity of the mold 2 On the front side 9, 34 of the dummy bar head 3, 33 facing 7, the seal grip 1 can be destroyed by the injected steel, at least in the area of the sealing material edge 49.
0, 20, 30, 40 are provided with fixing surfaces 11, 45 for sealing materials 6, 43, and seal gripping parts 10,
1. A sealing device for a dummy bar head in a continuous casting mold, characterized in that a sealing material 6, 43 is provided between the dummy bar head 3, 33 and the dummy bar head 20, 30, 40. 9. The sealing device according to claim 8, wherein the sealing material 6 is rope-shaped. 10. The sealing device according to claim 8, wherein the sealing material 43 has a planar shape. 11 The seal gripping part 10, 20, 30, 40
The mold hollow cross section 22 is constructed from a material that is easily deformable, and is
Claims 8 to 10, characterized in that the seal gripping portion has a dimension 21 that is adapted to the above, but the dimension 21 is larger than the cross section 22 of the mold cavity of the mold. The sealing device described in any one of the above. 12. The sealing device according to any one of claims 8 to 11, wherein the seal gripping portions 10, 20, and 40 are pyramid-shaped. 13 The seal gripping part 10, 20, 30, 40
13. The sealing device according to claim 8, further comprising a metal collision plate 16 at a position where the liquid steel collides with the metal collision plate. 14. The seal gripper according to any one of claims 8 to 13, characterized in that the seal gripping parts 10, 20 are made of a gasizable foamed plastic, such as expanded polystyrene, for example. sealing device. 15. The sealing device according to any one of claims 8 to 13, wherein the seal gripping portion 40 is made of a resin having injection and injection capabilities. 16. Claims 8 to 15, characterized in that the seal gripping part 40 is configured as a cap that covers the side of the dummy bar head 3 facing the mold cavity 7 and the sealing material 43.
The sealing device described in any one of the preceding paragraphs. 17 The seal gripping portion 40 touches the sealing material edge 49 area of the dummy bar head 3 and the sealing material 43
The sealing device according to any one of claims 8 to 15, characterized in that the sealing device is configured as a cap that covers a sealing device.