Permanent mold plate and permanent mold

Abstract

The invention relates to a permanent mold plate having a plurality of fastening points (3) on the rear side (2) thereof for fastening purposes, and cooling ducts (5) which are adjacent to the fastening points (3) and are in the form of depressions that are located within the rear side (2) and are open towards the rear side (2). From the perspective of a fastening point (3) towards the casting side (4) of the mold plate (1) opposite the rear side (2), at least one cooling duct (5) extends all the way to a point located below the fastening point (3).

Claims

1. A permanent mold plate, comprising: a casting side; a rear side opposite to the casting side and including a plurality of fastening points; and cooling ducts disposed in the rear side in neighboring relation to the fastening points and configured in the form of depressions which are open and uncovered toward the rear side, at least one of the cooling ducts, when viewed linearly from a one of the fastening points on the rear side to the casting side opposite the rear side, extending in line with the one of the fastening points, said at least one of the cooling ducts having a base that faces the casting side and being widened in a region of the base so as to form at least one constriction in linear relationship to the one of the fastening points, wherein the cooling ducts have formed therein cooling slots which run in a longitudinal direction of the cooling ducts, at least one of the cooling slots being configured in a side wall of the cooling duct and extending up to below at least one of the fastening points, wherein the cooling slots are configured as undercuts and separated by webs.

2. The permanent mold plate of claim 1, wherein two of the cooling ducts are disposed on both sides of a one of the fastening points in the rear side, said two of the cooling ducts extending up to below the one of the fastening points.

3. The permanent mold plate of claim 1, wherein one of the cooling slots extends in a corner region between the side wall of the cooling duct and a base of the cooling duct in facing relation to the casting side.

4. The permanent mold plate of claim 1, wherein the at least one of the cooling slots which extends up to below the at least one of the fastening points possesses a consistent cross section and is free of any current-free region between a flow entry and a flow exit.

5. The permanent mold plate of claim 1, wherein the side walls of the cooling ducts have further webs which are disposed between the fastening points and shaped such that as a result of the shape of the webs and the fastening points, a cross section of the cooling ducts is not constant in the flow direction, while a cross section of the cooling slots is constant.

6. The permanent mold plate of claim 1, further comprising inserts configured to cover the cooling slots and disposed in the cooling ducts.

7. The permanent mold plate of claim 1, further comprising a mold level region, said cooling ducts extending up to below those fastening points that are disposed in the mold level region.

8. A permanent mold, comprising a plurality of permanent mold plates for delimiting a format cross section of a casting strand, each said permanent mold plate comprising a casting side, a rear side opposite to the casting side and including a plurality of fastening points, and cooling ducts disposed in the rear side in neighboring relation to the fastening points and configured in the form of depressions which are open and uncovered toward the rear side, at least one of the cooling ducts, when viewed from a one of the fastening points on the rear side to the casting side opposite the rear side, extending in line with the one of the fastening points, said at least one of the cooling ducts having a base that faces the casting side and being widened in a region of the base so as to form at least one constriction in linear relationship to the one of the fastening points, wherein the cooling ducts have formed therein cooling slots which run in a longitudinal direction of the cooling ducts, at least one of the cooling slots being configured in a side wall of the cooling duct and extending up to below at least one of the fastening points, wherein the cooling slots are configured as undercuts and separated by webs.

9. The permanent mold of claim 8, wherein two of the cooling ducts are disposed on both sides of a one of the fastening points in the rear side, said two of the cooling ducts extending up to below the one of the fastening points.

10. The permanent mold of claim 8, wherein one of the cooling slots extends in a corner region between the side wall of the cooling duct and a base of the cooling duct in facing relation to the casting side.

11. The permanent mold of claim 8, wherein the at least one of the cooling slots which extends up to below the at least one of the fastening points possesses a consistent cross section and is free of any current-free region between a flow entry and a flow exit.

12. The permanent mold of claim 8, wherein the side walls of the cooling ducts have further webs which are disposed between the fastening points and shaped such that as a result of the shape of the webs and the fastening points, a cross section of the cooling ducts is not constant in the flow direction, while a cross section of the cooling slots is constant.

13. The permanent mold of claim 8, wherein the permanent mold plate includes inserts configured to cover the cooling slots and disposed in the cooling ducts.

14. The permanent mold of claim 8, wherein the permanent mold plate includes a mold level region, said cooling ducts extending up to below those fastening points that are disposed in the mold level region.

15. A permanent mold plate, comprising: a casting side; a rear side opposite to the casting side and including a plurality of fastening points; cooling ducts disposed in the rear side in neighboring relation to the fastening points and configured in the form of depressions which are open and uncovered toward the rear side, at least one of the cooling ducts, when viewed linearly from a one of the fastening points on the rear side to the casting side opposite the rear side, extending in line with the one of the fastening points, said at least one of the cooling ducts having a base that faces the casting side and being widened in a region of the base so as to form at least one constriction in linear relationship to the one of the fastening points, wherein the cooling ducts have formed therein cooling slots which run in a longitudinal direction of the cooling ducts, at least one of the cooling slots being configured in a side wall of the cooling duct and extending up to below at least one of the fastening points; and inserts configured to cover the cooling slots and disposed in the cooling ducts.

16. A permanent mold, comprising a plurality of permanent mold plates for delimiting a format cross section of a casting strand, each said permanent mold plate comprising a casting side, a rear side opposite to the casting side and including a plurality of fastening points, and cooling ducts disposed in the rear side in neighboring relation to the fastening points and configured in the form of depressions which are open and uncovered toward the rear side, at least one of the cooling ducts, when viewed from a one of the fastening points on the rear side to the casting side opposite the rear side, extending in line with the one of the fastening points, said at least one of the cooling ducts having a base that faces the casting side and being widened in a region of the base so as to form at least one constriction in linear relationship to the one of the fastening points, wherein the cooling ducts have formed therein cooling slots which run in a longitudinal direction of the cooling ducts, at least one of the cooling slots being configured in a side wall of the cooling duct and extending up to below at least one of the fastening points, wherein the permanent mold plate includes inserts configured to cover the cooling slots and disposed in the cooling ducts.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) The invention will be explained in more detail hereunder by means of an exemplary embodiment illustrated in the schematic drawings in which

(2) FIG. 1 shows a horizontal sectional illustration of a rear side of a permanent mold plate;

(3) FIG. 2 shows the permanent mold plate of FIG. 1 having assembled inserts; and

(4) FIG. 3 shows a permanent mold from a plurality of permanent mold plates.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(5) FIG. 1 shows a sectional illustration through a permanent mold plate 1. The section plane runs in the horizontal direction. The permanent mold plate 1 is shown in a perspective illustration from the rear side, wherein only a part-region of a longitudinal edge and of the rear side of the permanent mold plate are to be seen.

(6) The rear side 2 of the permanent mold plate 1 is the rear-side plane in which a plurality of fastening points 3 are disposed. The fastening points 3 are provided for connecting the permanent mold plate 1 to a water box (not illustrated in more detail) or to a support plate. To this end, the fastening points 3 possess threaded inserts which are inserted in bores in the rear side 2 of the permanent mold plate 1.

(7) That side of the permanent mold plate 1 that is opposite the rear side 2 is the casting side 4 by way of which a strand of metal to be cooled is cooled. A plurality of permanent mold plates 1 in a manner not illustrated in more detail delimit a format cross section of a typically rectangular casting strand. The permanent mold plate 1 is cooled by water which is directed through cooling ducts 5 which in the image plane of FIG. 1 extend from top to bottom, so as to be parallel to a longitudinal side 6 of the permanent mold plate 1. The cooling ducts 5 run so as to be mutually parallel and in the form of substantially rectangular depressions are open toward the rear side 2 of the permanent mold plate 1. The cooling ducts 5 are mutually separated by way of narrow webs 7. The webs 7 connect two neighboring or successive, respectively, fastening points 3 to one another. The wall thickness of the webs 7 between the fastening points 3 is substantially smaller than below a fastening point 3, as can be seen by means of the position of the section plane. The fastening point 3 that is central in the section plane of FIG. 1 is configured in a pillar-like manner, so to speak, and possesses a constant cross section across the predominant longitudinal region thereof. Said longitudinal region is wider than the web 7 adjacent thereto.

(8) However, the width is reduced in the transition to the rearward side of the casting side 4. A milling tool 8 in the form of an end mill highlights that constrictions are produced in the pedestal region of the fastening points 3. The constrictions are configured so as to be symmetrical. Said constrictions lead to a widening of the cooling duct 5 in the region of the base 9 thereof.

(9) It can furthermore be seen that the base 9 of the cooling ducts 5 overall is not planar but possesses a plurality of cooling slots 10, 11, 12 which are in each case mutually separated by webs 13, 14 that run so as to be mutually parallel. The three cooling slots 10, 11, 12 possess a constant cross section. The cooling slots 11, 12 that are disposed on the periphery of the base 9, when viewed from the fastening points 3, configure undercuts, and, when viewed from the fastening points 3 in the direction toward the casting side 4, engage below the fastening points 3.

(10) A region of the casting side 4, identified by the reference sign HS, is identified as a so-called hot spot in FIG. 1. Hot spots HS of this type are located below each fastening point 3 on the casting side 4, because the heat from the casting side 4 in this region to date has been able to be only insufficiently discharged by the coolant. However, it can be seen that the region of the hot spot HS on account of the cooling ducts 5 widened in the base region, or the cooling slots 11, 12 disposed therein, respectively, in the case of the invention is reduced in size geometrically and also on account of improved cooling. The cross section in the region below the fastening points 3 is reduced by approx. 50%. At the same time, the cooling slots 12 possess a constant cross section such that cooling water can be guided past the hot spots HS at a high flow rate and can very effectively discharge the thermal energy from said regions. The hot spots HS in thermal terms become significantly smaller on account thereof. The temperature variations on the casting side 4 are significantly lower.

(11) FIG. 2 shows the same permanent mold plate 1 as in FIG. 1. Additionally, inserts 15 are inserted from the rear side 2 into the cooling ducts 5. It can be seen that the inserts 15 are supported on the webs 13, 14 and in terms of height extend up to the rear side 2. To this end, lateral parts 16, 17 which are adapted to the contour of the webs 7, or to the sidewalls 18 of the cooling ducts 5, respectively, are located in the region of the webs 7 between the fastening points 3. On account of the inserts 15, the flow rate within the cooling slots 10, 11, 12 is significantly increased. The lateral parts 16, 17 extend up to the rear side 2 of the permanent mold plate 1, such that said lateral parts 16, 17 even under the pressure of the coolant securely bear on the webs 13, 14 on the base 9 of the cooling ducts 5, and reliably guarantee the guiding of the flow. The pedestal regions of the fastening points 3 are particularly effectively cooled.

(12) FIG. 3 in a perspective illustration shows a permanent mold 19. The permanent mold 19 possesses two mutually opposite permanent mold plates 1 according to the preceding exemplary embodiment. The two permanent wall plates 1 are spaced apart and in the center configure a molding cavity 20 that tapers in a funnel-shaped manner in the casting direction. The narrow sides of the molding cavity 20 are delimited by way of narrow-side plates 21. Consequently, the permanent mold plates 1 in combination with the narrow-side plates 21 delimit the format cross section of a casting strand that is rectangular at the exit end of the permanent mold 19.

(13) The two permanent mold plates 1 are of identical configuration. A complete rear side 2 of the permanent mold plate 1, in which the inserts 15 can also be seen, can be seen in the illustration of FIG. 3. The inserts 15 are held on the rear side 2 in part by way of screw connections 22 and in part by way of clamps 23. The permanent mold plates 1 in the installed position are screw-fitted to a water box (not illustrated in more detail) or to a support plate. The inserts 15 in this instance are also supported on the water box, or on the support plate, respectively.