CN118475422A - Casting mould of continuous casting equipment - Google Patents

Abstract

The invention relates to a casting mold (1) of a continuous casting device. The casting mold (1) comprises: a movably supported frame (2), having a first subframe (2.1), a second subframe (2.2), a first wide side insert (3) arranged on the first subframe (2.1), and a second wide side insert (4) arranged on the second subframe (2.2). Between the two wide side inserts (3, 4) are narrow sides (7, 8), each having a narrow side copper plate (9) abutting against the two wide side inserts (3, 4). The casting mold (1) also comprises a clamping device (11) for applying a clamping force acting between the subframes (2.1, 2.2) to the subframes (2.1, 2.2), and an oscillating drive (13) for causing the frame (2) to oscillate relative to the narrow sides (7, 8) in a horizontal width direction (H) and in the opposite direction. Spring band assemblies (17) are arranged on opposite sides of each sub-frame (2.1, 2.2) in the width direction (H), respectively, and guide the sub-frames (2.1, 2.2).

Description

Casting molds for continuous casting equipment

Technical Field

The invention relates to a casting mold for continuous casting equipment.

Background Art

In a continuous casting plant, the metal melt is fed into a cooled casting mold, in which the melt begins to solidify. In the casting mold, the surface area of the melt solidifies into a so-called strand shell, which surrounds the still liquid metal core. The metal strand with the strand shell is discharged from the casting mold and then cooled further.

During continuous casting, the casting mold is usually set in vertical oscillating motion so that the strand does not adhere to the inner surface of the casting mold and the casting powder used for lubrication is better absorbed between the strand and the inner surface of the casting mold.

However, this vertical movement of the casting mold produces grooves called vibration marks on the product produced during the continuous casting process. Vibration marks are a problem for the further processing of the product, so after continuous casting, the surface of the product usually has to be ground. This grinding is very time-consuming and cost-intensive.

Summary of the invention

The object of the present invention is to reduce vibration marks during continuous casting.

This object is achieved according to the invention by a casting mold having the features of claim 1 .

Advantageous developments of the invention are the subject matter of the dependent claims.

The casting mold of the continuous casting device according to the present invention comprises:

- a movably supported frame having a first subframe and a second subframe spaced apart from the first subframe,

a first broadside insert, which is arranged on a side of the first subframe facing the second subframe,

a second broadside insert, which is arranged on a side of the second subframe facing the first subframe,

a narrow side arranged between the two wide-side inserts, the narrow sides each having a narrow-side copper plate resting against the two wide-side inserts,

- clamping means arranged to apply a clamping force to the sub-frames acting between the sub-frames, and

an oscillating drive which is provided for moving the frame in an oscillating manner relative to the narrow sides in a horizontal width direction and in a direction opposite thereto,

- wherein spring band assemblies are arranged on opposite sides of each subframe in the width direction, the spring band assemblies guiding the subframes, wherein each narrow-side copper plate has two end faces, which respectively abut against the wide-side insert and have a lubricating substance (Schmierung) for reducing friction with the wide-side insert.

The horizontal width direction refers to the horizontal direction in a plane located centrally between the two wide-side insert pieces.

The casting mold according to the invention enables, in addition to vertical oscillation of the casting mold, horizontal oscillation of the wide side of the casting mold relative to the narrow side. As a result, oscillation marks on the surface of the product produced during the continuous casting process can be reduced or completely avoided, so that the quality of the product can be advantageously improved. This can be achieved by a movably supported frame, on which the wide side inserts are arranged, and the frame can be moved in an oscillating manner relative to the narrow side by an oscillation drive. The frame consists of two subframes, on which the wide side inserts are respectively arranged, and the two subframes are held together by clamping devices. The subframes are respectively guided by two spring belt assemblies, which absorb the gravity and the forces acting on the cast strand generated in the casting mold.

In a refinement of the present invention, the oscillation drive comprises a first oscillation drive which is preferably implemented as a hydraulic cylinder and a second oscillation drive which is preferably implemented as a hydraulic cylinder, wherein the first oscillation drive is arranged on the first longitudinal frame of the casting mold on the side of the first subframe facing away from the second subframe and is coupled to the first subframe, and the second oscillation drive is arranged on the second longitudinal frame of the casting mold on the side of the second subframe facing away from the first subframe and is coupled to the second subframe.

The above-mentioned improvement of the invention can achieve, on the one hand, the division of the forces generating the horizontal oscillations of the frame and, on the other hand, the symmetry of said forces.

In a further development of the invention, at least one, preferably each, narrow-side copper plate has a rounding or chamfer at the edge that contacts the wide-side copper plate and is substantially at right angles to the horizontal width direction, wherein the radius of the rounding is between 0.1 mm and 3 mm, preferably between 0.3 mm and 1 mm, and the size of the chamfer is between 0.1 mm and 3 mm, preferably between 0.3 mm and 1 mm. The friction is reduced by such a rounding or chamfer, and the wear of the copper plate is additionally reduced. Of course, it is also conceivable that all edges that contact the wide-side copper plate have such a radius or chamfer.

In a further development of the invention, wide-side foot rollers are arranged on the underside of each longitudinal frame, whose roller axes extend in the width direction and are provided for guiding the metal strand emerging from the casting mold. Thus, the forces exerted on the casting mold by the strand emerging from the casting mold only act on the longitudinal frames and not on the movable frames.

In a further development of the invention, each end face of the narrow copper plate has a groove in which a lubricant (Schmierstoff) as a lubricating substance can be supplied to the end face. For this purpose, the lubricant is guided via flexible hoses and pipes to the side of the narrow copper plate facing away from the blank and from there further to the groove.

Optionally, each end face has, for example, a wear strip as lubricating substance, which preferably consists of sintered metal with an integrated lubricant, preferably a solid lubricant.

The above improvement of the invention takes into account that when the frame moves horizontally relative to the narrow side, the wide side insert arranged on the frame rubs against the end face of the narrow side copper plate resting on the wide side insert. The lubricating substance on the end face advantageously reduces this friction.

In a further development of the invention, the first wide side insert has a support plate arranged on the first subframe and a wide side copper plate arranged on the support plate, and the second wide side insert has a support plate arranged on the second subframe and a wide side copper plate arranged on the support plate.

The above-mentioned improvement of the invention takes into account that the broadside copper plates wear relatively quickly due to their contact with the cast ingot cast in the mold and therefore have to be replaced from time to time. Therefore, it is advantageous to provide a support plate for the broadside copper plates, on which the broadside copper plates can be arranged.

In a further development of the invention, the casting mould has two compensators for each subframe, via which cooling water can be supplied to the subframe and cooling water can be discharged from the subframe and horizontal movements of the subframe are compensated.

The above-mentioned improvement of the invention takes into account that the broadside insert, in particular its broadside copper plate, must be cooled in order to be able to sufficiently cool the cast strand produced in the casting mold so that the cast strand forms a strand shell. In order to compensate for the horizontal movement of the frame, a compensator is therefore provided to supply cooling water to the subframe, which compensates for the horizontal movement of the subframe. The cooling water conducted through the subframe is used to cool the broadside insert, in particular the broadside copper plate.

In a further improvement of the present invention, the clamping device has two clamping units, which are arranged on opposite sides of the frame in the width direction and are configured to apply clamping forces acting between the sub-frames to the sub-frames, respectively. For example, each clamping unit has a hydraulic cylinder for generating the clamping force.

The above-mentioned improvement of the invention enables clamping of the subframe on both sides. This advantageously enables clamping of the subframe symmetrically on opposite sides in the width direction, compared to clamping on only one side. It is thus possible, for example, to make the forces acting between the narrow side and the subframe compensate for each other on opposite sides in the width direction of the subframe by clamping. For example, it is thus possible to avoid that the friction between the narrow side and the subframe is higher on one side of the subframe than on the other side.

In a further development of the invention, the clamping unit arranged on the frame has pivot units on both sides which allow a movement of the frame in the horizontal width direction at least temporarily in different directions.

An advantageous embodiment provides that the clamping force is adjusted by means of a control and/or regulating device so that the contact pressure between each narrow-side copper plate and the wide-side copper plate in contact therewith is adjusted so that before the start of the oscillation and during the oscillation, the contact pressure generated by the oscillation drive has a value between 0 and 1 N/mm ² , preferably between 0 and 0.5 N/mm ² .

BRIEF DESCRIPTION OF THE DRAWINGS

The above characteristics, features and advantages of the present invention and the methods for achieving them will become clearer and easier to understand in conjunction with the following description of the embodiments, which will be explained in more detail in conjunction with the accompanying drawings, in which:

FIG. 1 shows a perspective view from above of an embodiment of a casting mold of a continuous casting device,

FIG. 2 shows a perspective view of the bottom side of the casting mold shown in FIG. 1 ,

FIG. 3 shows a perspective cross-sectional view of the casting mold shown in FIG. 1 ,

FIG4 shows a schematic diagram of a casting mold of a continuous casting device,

FIG. 5 shows a detailed illustration of a narrow side panel with a radius.

In the drawings, parts corresponding to each other have the same reference numerals.

DETAILED DESCRIPTION

The drawings show an embodiment of a casting mold 1 of a continuous casting device. Fig. 1 (Fig. 1) shows a perspective view of the casting mold 1 from the upper side. Fig. 2 (Fig. 2) shows a perspective view of the casting mold 1 from the lower side. Fig. 3 (Fig. 3) shows a perspective sectional view of the casting mold 1.

The casting mold 1 comprises, in particular, a movably mounted frame 2 , two broadside inserts 3 , 4 , two narrow sides 7 , 8 , a clamping device 11 , an oscillation drive 13 , two longitudinal frames 14 , 15 , a spring band assembly 17 and a compensator 18 .

The frame 2 includes a first sub-frame 2.1 and a second sub-frame 2.2 spaced apart from the first sub-frame 2.1.

Each wide side insert 3, 4 comprises a support plate 5 and a wide side copper plate 6. The first wide side insert 3 is arranged on the side of the first subframe 2.1 facing the second subframe 2.2. In this case, the support plate 5 of the first wide side insert 3 is arranged on the first subframe 2.1. The wide side copper plate 6 of the first wide side insert 3 is arranged on the side of the support plate 5 of the first wide side insert 3 facing the second wide side insert 4. For example, the support plate 5 of the first wide side insert 3 is bolted to the first subframe 2.1, and the wide side copper plate 6 of the first wide side insert 3 is bolted to the support plate 5 of the first wide side insert 3.

Accordingly, the second wide side insert 4 is arranged on the side of the second subframe 2.2 facing the first subframe 2.1. In this case, the support plate 5 of the second wide side insert 4 is arranged on the second subframe 2.2. The wide side copper plate 6 of the second wide side insert 4 is arranged on the side of the support plate 5 of the second wide side insert 4 facing the first wide side insert 3. For example, the support plate 5 of the second wide side insert 4 is bolted to the second subframe 2.2, and the wide side copper plate 6 of the second wide side insert 4 is bolted to the support plate 5 of the second wide side insert 4.

Thus, the broadside copper plates 6 of the two broadside inserts 3, 4 face each other and are spaced apart from each other. The narrow sides 7, 8 of the casting mold 1 are arranged between the two broadside inserts 3, 4. Each narrow side 7, 8 has a narrow side copper plate 9, which rests on the broadside copper plates 6 of the two broadside inserts 3, 4, and the narrow side copper plates 9 face each other. Thus, the broadside copper plates 6 and the narrow side copper plates 9 form the inner wall of the casting mold 1.

The clamping device 11 has two clamping units 11.1, 11.2, which are arranged on opposite sides of the frame 2 along the horizontal width direction H and are configured to apply a clamping force acting between the sub-frames 2.1, 2.2 of the frame 2. To this end, each clamping unit 11.1, 11.2 has a hydraulic cylinder 12 for generating the clamping force.

The oscillating drive 13 is provided for moving the frame 2 in an oscillating manner in the width direction H relative to the narrow sides 7, 8 and the longitudinal frames 14, 15 of the casting mold 1. For this purpose, the oscillating drive 13 has two hydraulic cylinders 13.1, 13.2. The first hydraulic cylinder 13.1 is arranged on the first longitudinal frame 14 on the side of the first subframe 2.1 facing away from the second subframe 2.2 and is coupled to the first subframe 2.1. The second hydraulic cylinder 13.2 is arranged on the second longitudinal frame 15 on the side of the second subframe 2.2 facing away from the first subframe 2.1 and is coupled to the second subframe 2.2.

By means of two hydraulic cylinders 13.1, 13.2, the frame 2 can thus be moved in the width direction H and in the direction opposite to the width direction H relative to the longitudinal frames 14, 15 and the narrow sides 7, 8. During these movements of the frame 2, the wide-side copper plate 6 rubs against the end face 9.1 of the narrow-side copper plate 9 resting thereon. In order to reduce this friction, the end faces 9.1 of the narrow-side copper plates 9 resting against the wide-side copper plates 6 each have a lubricating substance 10. For example, each end face 9.1 has a groove in which a lubricant can be supplied to the end face 9.1 as the lubricating substance 10. The lubricant used is, for example, grease or oil. Optionally, each end face 9.1 has, for example, a wear strip with an integrated lubricant as the lubricating substance 10. For example, graphite is used as a lubricant.

In order to further reduce the friction between the broadside copper plates 6 and the narrowside copper plates 9, the clamping force exerted by the clamping units 11.1, 11.2 on the subframes 2.1, 2.2 is reduced during the horizontal oscillation of the frame 2, for example compared to the start of casting of the continuous cast metal strand.

The spring band assembly 17 serves to guide the frame 2 during horizontal movement or oscillation of the frame. On each subframe 2.1, 2.2 of the frame 2, a spring band assembly 17 is arranged on opposite sides in the width direction H. The spring bands extend vertically and are connected at their ends to the longitudinal frames 14, 15, respectively. In order to avoid excessive stresses in the spring bands, the spring bands extend substantially over the entire vertical extension of the casting mold 1, respectively, so as to achieve the maximum possible length of the spring bands.

On the underside of each longitudinal frame 14, 15, wide-side foot rollers 16 are arranged, whose roller axes extend in the width direction H and are provided for guiding the metal strand coming out of the casting mold 1. Therefore, the force exerted by the strand on the casting mold 1 only acts on the longitudinal frames 14, 15, but not on the frame 2.

In order to cool the subframes 2.1, 2.2 and the wide side inserts 3, 4 when casting the ingot, each subframe 2.1, 2.2 is connected to two compensators 18, through which cooling water from the longitudinal frames 14, 15 can be supplied to the subframes 2.1, 2.2, and cooling water from the subframes 2.1, 2.2 can be discharged into the longitudinal frames 14, 15.

Guide strips (not shown) are arranged on the upper side of the casting mold 1 and serve to suspend and guide the narrow sides 7 , 8 and are respectively screwed externally to the longitudinal frames 14 , 15 , but are spaced apart from the frame 2 in order not to hinder the horizontal movement of the frame 2 .

In addition to the components described, the casting mold 1 has further components which are however not relevant to the invention and are therefore not described or illustrated here. For example, the casting mold 1 may have a further oscillating drive which is provided for moving the casting mold in an oscillating manner in the vertical direction.

FIG. 4 schematically shows a casting mold 1 with clamping units 11.1, 11.2, each of which has a pivot unit 20. By means of the pivot unit 20, the movement of the subframes 2.1, 2.2 in the horizontal width direction by means of the oscillating drive 13 can be carried out at least temporarily in different directions. The clamping unit is implemented as a hydraulic cylinder 12. The subframes 2.1, 2.2 are each connected to a support plate 5, and the wide-side copper plates 6 are mounted on the support plate. The narrow sides 8, 9 are mounted between the wide-side copper plates 6, and the clamping units 11.1, 11.2 are controlled or regulated by a control or regulating device 24, so that the contact pressure between the wide-side copper plates 6 and the narrow sides 7, 8 is maintained at a predetermined value. The control or regulating device 24 receives in particular the pressure measured by the pressure measuring device 22 as an input variable and transmits a corresponding signal to the hydraulic station 23. During the oscillating movement, the contact pressure should be between 0 and 1 N/ ^mm2 .

5 shows a detailed view of the broadside insert 3, 4 consisting of the support plate 5 and the broadside copper plate 6 as well as the narrow sides 8, 9. The narrow sides 8, 9 also have narrowside copper plates 9. A radius 21 is formed on both sides of the narrowside copper plates 9.

Although the details of the present invention have been shown and described in more detail by means of a preferred embodiment, the present invention is not limited to the disclosed examples and other variations may be derived therefrom by a person skilled in the art without departing from the scope of protection of the present invention.

Reference numerals list

1. Casting

2 Framework

2.1, 2.2 Subframe

3, 4 Wide side inserts

5 Support plate

6 Wide side copper plate

7, 8 Narrow side

9 Narrow side copper plate

9.1 End face

10 Lubricating substances

11 Clamping device

11.1, 11.2 Clamping unit

12 Hydraulic cylinder for clamping unit

13 Oscillation driver

13.1, 13.2 Hydraulic cylinder of oscillation drive

14, 15 Vertical frame

16 wide side foot roller

17 Spring band assembly

18 Compensator

20 Pivot Unit

21 Radius

22. Pressure measuring device

23 Hydraulic station

24 Control or regulating devices

H Width direction

Claims (12)

1. A casting mould (1) of a continuous casting apparatus, the casting mould (1) comprising:

A movably supported frame (2) having a first subframe (2.1) and a second subframe (2.2) spaced apart from the first subframe (2.1),

A first broadside insert (3) arranged on a side of the first subframe (2.1) facing the second subframe (2.2),

A second broad-side insert (4) arranged on the side of the second subframe (2.2) facing the first subframe (2.1),

A narrow side (7, 8) arranged between the two wide side inserts (3, 4), each having a narrow side copper plate (9) which rests on the two wide side inserts (3, 4),

-Clamping means (11) arranged for applying a clamping force to the subframes (2.1, 2.2) acting between the subframes (2.1, 2.2), and

An oscillating drive (13) arranged for moving the frame (2) in an oscillating manner relative to the narrow sides (7, 8) in a horizontal width direction (H) and in a direction opposite thereto,

Wherein on opposite sides of each subframe (2.1, 2.2) in the width direction (H) spring strap assemblies (17) are arranged, respectively, which guide the subframes (2.1, 2.2),

-Wherein each narrow-side copper plate (9) has two end faces (9.1) which bear against the wide-side inserts (3, 4) and have a lubricating substance (10) for reducing friction with the wide-side inserts (3, 4).

2. The casting mould (1) according to claim 1, wherein a first oscillation drive (13) is preferably embodied as a hydraulic cylinder (13.1), which is arranged on a first longitudinal frame (14) of the casting mould (1) on a side of the first subframe (2.1) facing away from the second subframe (2.2), and which is coupled to the first subframe (2.1); and a second oscillating drive (13.2), preferably embodied as a hydraulic cylinder, which is arranged on a second longitudinal frame (15) of the casting mould (1) on a side of the second subframe (2.2) facing away from the first subframe (2.1) and is coupled to the second subframe (2.2).

3. Casting mould (1) according to claim 2, wherein on the underside of each longitudinal frame (14, 15) there is arranged a wide-sided foot roller (16), the roller shafts of which extend in the width direction (H) respectively, and which are provided for guiding the metal strand emerging from the casting mould (1).

4. The casting mould (1) according to claim 1, wherein each end face (9.1) has a recess in which lubricant as lubricating substance (10) can be supplied to the end face (9.1).

5. A casting mould (1) as claimed in claim 1, wherein each end face (9.1) has a wear strip as lubricating substance (10), preferably made of sintered metal, with an integrated lubricant, preferably a solid lubricant.

6. The casting mould (1) according to any one of the preceding claims, wherein at least one, preferably each narrow-side copper plate (9) has a radius or chamfer at the edge in contact with the wide-side copper plate and substantially at right angles to the horizontal width direction (H), wherein the radius (21) of the radius is between 0.1mm and 3mm, preferably between 0.3mm and 1mm, and the chamfer has a dimension of between 0.1mm and 3mm, preferably between 0.3mm and 1 mm.

7. The casting mould (1) according to any of the preceding claims, wherein the first broadside insert (3) has a support plate (5) arranged on the first subframe (2.1) and a broadside copper plate (6) arranged on the support plate (5), and the second broadside insert (4) has a support plate (5) arranged on the second subframe (2.2) and a broadside copper plate (6) arranged on the support plate (5).

8. The casting mould (1) according to any of the preceding claims, having two compensators (18) for each subframe (2.1, 2.2), by means of which cooling water can be supplied to the subframe (2.1, 2.2) and can be discharged from the subframe (2.1, 2.2) and the horizontal movement of the subframe (2.1, 2.2) can be compensated.

9. The casting mould (1) according to any one of the preceding claims, wherein the clamping device (11) has two clamping units (11.1, 11.2) arranged on opposite sides of the frame (2) in the width direction (H), the clamping units being provided for applying a clamping force to the subframes (2.1, 2.2) acting between the subframes (2.1, 2.2), respectively.

10. Casting mould (1) according to claim 9, characterized in that the clamping units (11.1, 11.2) each have a pivoting unit (20) which allows movement of the subframe (2.1, 2.2) in the horizontal width direction to take place at least temporarily in different directions.

11. The casting mould (1) according to claim 9, wherein each clamping unit (11.1, 11.2) has a hydraulic cylinder (12) for generating a clamping force.

12. The casting mould (1) according to any of the preceding claims, characterized in that the clamping force is adjusted by control and/or regulation means (24) such that the contact pressure between each narrow side (7, 8) and the wide side copper plate (6) in contact therewith is adjusted such that the contact pressure generated by the oscillating drive (13) immediately before and during the start of oscillation has a value between 0 and 1N/mm ², preferably between 0 and 0.5N/mm ².