MOULD PLATE

Abstract

A mould plate includes a casting side and a rear side facing away from the casting side and having a cooling channel configured to open towards the rear side and having a cooling face opposite the casting side. An insert is arranged in the cooling channel to form a cooling gap between an inner face of the insert and the cooling face. A fastening bolt connects the insert to a fastening point in the cooling face, wherein the cooling gap extends, viewed from the fastening point towards the casting side, to an area below the fastening point.

Claims

1.-13. (canceled)

14. A mould plate, comprising: a casting side; a rear side facing away from the casting side and having a cooling channel configured to open towards the rear side and having a cooling face opposite the casting side; an insert arranged in the cooling channel such as to form a cooling gap between an inner face of the insert and the cooling face; and a fastening bolt connecting the insert to a fastening point in the cooling face, wherein the cooling gap extends, viewed from the fastening point towards the casting side, to an area below the fastening point.

15. The mould plate of claim 14, wherein the fastening point is configured as an island-like elevation relative to the cooling face.

16. The mould plate of claim 15, wherein a thickness of the mould plate between the casting side and the cooling face in a region of the fastening point is no smaller than in other regions of the cooling channel.

17. The mould plate of claim 14, wherein the cooling face includes a plurality of said fastening point which are arranged offset to one another in a longitudinal direction and in a transverse direction of the cooling channel.

18. The mould plate of claim 14, wherein the insert includes a rear support protrusion in a length portion of the fastening point with respect to a longitudinal direction of the cooling channel.

19. The mould plate of claim 14, wherein the insert includes mutually directly opposite support protrusions on two long sides of the insert.

20. The mould plate of claim 19, wherein the insert has between the mutually opposite support protrusions on the long sides a thickness which is greater than a thickness next to the support protrusions in a longitudinal direction.

21. The mould plate of claim 14, wherein a working gap is arranged between the mould plate and the insert in a region of the fastening point so as to mount the mould plate floatingly relative to the insert at the fastening point, with the fastening point being displaceable relative to the insert laterally in a longitudinal direction and a transverse direction of the cooling channel without seizing.

22. The mould plate of claim 21, wherein the working gap is less than 2/10 mm.

23. The mould plate of claim 14, further comprising a screw-locking element configured to screw the insert to the fastening point.

24. The mould plate of claim 14, wherein the fastening point has a threaded insert.

25. The mould plate of claim 14, wherein the fastening bolt includes a bolt head which is arranged fully countersunk into a stepped through-bore in the insert.

26. The mould plate of claim 14, wherein the insert extends over a web delimiting the cooling channel and/or grips in a rear pocket in a wall of a cooling channel.

Description

[0030] FIG. 1 shows the prior art and serves to explain the technological background. It is not an embodiment for which protection is claimed. The invention is then explained in more detail with reference to an exemplary embodiment shown purely schematically in FIG. 2.

[0031] FIG. 1 shows in a perspective view a partial region of a mould plate 1 in partial cross-section. The reference signs used to explain the mould plate 1 in FIG. 1 are also used for components of substantially the same function in the mould plate 1 according to the invention as shown in FIG. 2.

[0032] The mould plate 1 in FIG. 1 has a casting side facing away from the viewer, and a rear side 2 facing the viewer. In the installation position, the rear side 2 rests on a support plate (not shown in detail). During casting operation, hot melt on the casting side 2 is cooled in that heat is extracted from the mould plate 1 and dissipated via cooling water conducted through cooling gaps 4, which in turn are situated inside cooling channels 5. The casting direction for this mould plate 1 corresponds to the vertical direction. The cooling channels 5 therefore extend parallel to the casting direction from top to bottom. They run parallel to one another.

[0033] Inserts 6 which delimit the cooling gap 4 towards the rear side 3 are arranged inside the cooling channels 5. The inserts 6 are formed U-shaped in cross-section. Their inner faces 7 facing the cooling gaps 4 bear on webs 8, which point from a cooling face 9 of the cooling channels 5 in the direction towards the rear side 3 of the mould plate 1. The webs 8 determine the height of the cooling gaps 4. The mutual spacing of the webs 8 determines the width of the cooling gaps 4, and hence as a whole the cross-sectional area of the cooling gaps 4. During casting operation, a high pressure prevails in the cooling gaps 4. During operation therefore, the inserts 6 rest on a support plate which is not shown in detail. For this, they have several support protrusions 10 which are arranged spaced apart from one another and reach as far as the rear side 3 of the mould plate 1. The inserts 6 are contoured on their long sides and have support protrusions 11 that are profiled towards the long side so as to be adapted to the contour of the walls of the cooling channels 5, such that the inserts 6 are positionally oriented inside the cooling channels 5 both in the longitudinal direction L and in the transverse direction Q. The inserts 6 can only be removed from the cooling channels 5 towards the rear 3.

[0034] Two adjacent cooling channels 5 are separated from one another by webs 12. Fixing points 13 which are spaced apart from one another are arranged within the webs twelve. They have threaded inserts 14 via which the mould plate 1 together with the inserts 6 can be bolted to the support plate to be arranged on the rear. In this way, each insert 6 is precisely positionally oriented and held inside the cooling channels.

[0035] The mould plate 1 according to the invention has the essential difference that fastening points 15 with threaded inserts 16 are arranged on the respective cooling faces 9 of the cooling channels 5. The fastening points 15 point towards the rear side 3 of the mould plate 1. Fastening bolts 17 are arranged in through-bores 18 in the respective insert 6, and screwed into the threaded inserts 16 of the fastening points 15. Via a sleeve 19 and the screw-locking element 20, the bolt head 21 of the fastening bolt 17 bears on the fastening point 15. A collar 22 in the through-bore 18 is held with play between the fastening point 15 and the sleeve 19. In a manner not depicted in detail, a narrow working gap with a width of less than 2/10 mm is situated between the fastening point and the sleeve 19. Also, the diameter of the through-bore 18 in its entire length region is so large that a slight lateral shift of the fastening point 15 relative to the insert 6 can take place. In this way, thermally induced stresses between the insert 6 and mould plate 1 are avoided.

[0036] The fastening points 15 are each situated in the region of the webs 8. Since two webs 8 have a parallel distance from one another, there are two rows of fastening points 15. The fastening points 15 of the adjacent rows are arranged offset to each other in the longitudinal direction L of the cooling channel 5. Since the webs 8 which delimit the cooling gaps 4 are arranged at approximately equal distances from one another, the respective fastening points 15 have approximately the same distance from a left and a right wall of the respective channel 5, and therefore have approximately the same distance from the fixing points 13 arranged there. This gives a high density of fastening points 15 and fixing points 13, via which the mould plate 1 may be connected to the inserts 6 and a support plate respectively.

[0037] The fastening points 15 are island-like elevations. They start at a distance from the cooling face 17, i.e. where the webs 8 end. Since the fastening points 15 have a greater width than the webs 8, the fastening points 15 have an undercut towards the casting side when viewed vertically from the rear. The adjacent cooling gap 4 extends to below the respective fastening point 15, but only so far as defined by the width of the web 18. In the sectional depiction of FIG. 2, the fastening points 15 appear to be constricted at the side. These constrictions below the fastening points 15 therefore take the form of segments lying diametrically opposite one another and separated by the web. The web 8 to a certain extent is the connecting link between the fastening point 15 and the cooling face 9.

[0038] The through-bores 18 are situated between two diametrically opposed support protrusions 10 which are each arranged on a respective long side of the insert 6. There are further support protrusions 11 at a distance from the above-mentioned support protrusions 10. The support protrusions 10, 11, as in the embodiment of the prior art, serve to support the inserts 6 at the rear on the support plate (not shown in detail). The wider support protrusions 11 are situated where the respective insert 6 has a greater thickness than the regions of the insert 6 adjacent thereto in the longitudinal direction L. The other regions are those length portions in which there are no fastening points 15 or through-bores 18. The thicker regions between the mutually opposite, wider support protrusions 10 serve as yokes and are therefore intended to absorb forces exerted by the mould plate 1 on the inserts 6 in the region of the cooling face 9 and via the fastening points 15. The regions between said support protrusions 10 are particularly bend-resistant and solid. In the other regions in which the inserts 6 merely have the function of delimiting the cooling gaps 4, but without absorbing forces via additional fastening points 15, no such solid supports are required. Accordingly, the support protrusions 11 there are dimensioned smaller in cross-section.

[0039] The inserts 6 may not only absorb forces acting from the webs 8 on the cooling face 9 in the direction of the inserts 6 and transmit these to the support plate, but also absorb forces which point in the opposite direction. For this, the support protrusions 10 extend over the web 12 between two cooling channels 5. In this region, the insert 6 is wider than the cooling channel 5. In this region, the web 12 has a slightly smaller height. As a result, the support protrusion 10 does not protrude beyond the rear side 3 but ends in the same plane as the fixing points 13 and the other regions of the web 12. If no web is present, as at an end-side cooling channel 5, the support protrusion 10 grips in a rear pocket 23 which is a depression in the rear side 3. The support protrusion 10 does not therefore protrude beyond the rear side 3.

[0040] It is furthermore noted that the bolt heads 21 of the fastening bolts 17 are completely countersunk into the stepped through-bores 18 of the insert 6.

[0041] The mould plate 1 according to the invention, because of the plurality of fastening points 15 between the inserts 6, has a higher bending stiffness so as to avoid plastic deformations due to thermal influences. In comparison with the prior art, the homogeneity of the heat dissipation is retained.

LIST OF REFERENCE SIGNS

[0042] 1—Mould plate [0043] 2—Casting side of 1 [0044] 3—Rear side of 1 [0045] 4—Cooling gap in 5 [0046] 5—Cooling channel in 1 [0047] 6—Insert in 5 [0048] 7—Inner face of 6 [0049] 8—Web at 7 [0050] 9—Cooling face of 5 [0051] 10—Support protrusion [0052] 11—Support protrusion [0053] 12—Web of 1 [0054] 13—Fixing point [0055] 14—Threaded insert in 13 [0056] 15—Fastening point [0057] 16—Threaded insert in 15 [0058] 17—Fastening bolt in 15 [0059] 18—Through-bore [0060] 19—Sleeve [0061] 20—Screw-locking element [0062] 21—Bolt head of 17 [0063] 22—Collar in 18 [0064] 23—Pocket in 3 [0065] L—Longitudinal direction of 5 [0066] Q—Transverse direction of 5