MATRIX FOR A TIRE MOLD, MOLD INSERT FOR A TIRE MOLD, TIRE MOLD, AND METHOD FOR PRODUCING A MATRIX FOR A TIRE MOLD

Abstract

The invention relates to a matrix for a tire mold for vulcanizing tire blanks, the matrix forming a negative mold of a profiled tread of a tire, the matrix having a mold shell and at least one fin plate disposed thereon, the mold shell forming a mold inside and the fin plate forming a web of the negative mold, a slit being formed in the mold shell, the fin plate being inserted into the slit and attached to the mold shell. The slit penetrates a mold wall of the mold shell and extends from the mold inside to a mold back side of the mold shell, the fin plate being bonded to the mold shell from the mold back side.

Claims

1. A matrix for a tire mold for vulcanizing tire blanks, the matrix forming a negative mold of a profiled tread of a tire, the matrix having a mold shell and at least one fin plate disposed thereon, the mold shell forming a mold inside and the fin plate forming a web of the negative mold, a slit being formed in the mold shell, the fin plate being inserted into the slit and attached to the mold shell, wherein the slit penetrates a mold wall of the mold shell and extends form the mold inside to a mold back side of the mold shell, the fin plate being bonded to the mold shell from the mold back side.

2. The matrix according to claim 1, wherein the slit has a first portion which extends from the mold inside and a second portion, which extends from the mold back side and ends in the first portion.

3. The matrix according to claim 2, wherein a depth of the first portion is 2 mm to 10 mm and/or a depth of the second portion is 8 mm to 28 mm.

4. The matrix according to claim 2, wherein a shape of the slit in the first portion and/or a shape of the slit in the second portion follows a cross-sectional shape of the fin plate.

5. The matrix according to claim 2, wherein the slit is an oblong hole in the second portion.

6. The matrix according to claim 2, wherein a length of the fin plate is partially greater than a length of the slit in the first portion and/or a length of the slit in the second portion.

7. The matrix according to claim 2, wherein a length of the slit in the first portion is greater than a length of the slit in the second portion.

8. The matrix according to claim 1, wherein a distance between the mold inside and the mold back side is 10 mm to 30 mm.

9. The matrix according to claim 1, wherein the slit is formed by milling and/or spark erosion.

10. The matrix according to claim 1, wherein the fin plate at least partially has a round-arch-shaped or undulating cross section, in particular within the slit.

11. The matrix according to claim 1, wherein the fin plate is at least partially in contact with the mold inside and/or a shoulder formed in the slit.

12. A mold insert for a tire mold for vulcanizing tire blanks, wherein the mold insert comprises at least one matrix according to claim 1.

13. The mold insert according to claim 12, wherein the mold insert comprises a support configured to be connected, preferably screwed, to the matrix in a detachable manner and to be disposed on the mold back side.

14. A tire mold for vulcanizing tire blanks, wherein the tire mold has a plurality of tire mold segments, the tire mold segments each being composed of a segment base and a mold insert according to claim 12.

15. A method for producing a matrix for a tire mold for vulcanizing tire blanks, the matrix forming a negative mold of a profiled tread of a tire, at least one fin plate of the matrix being arranged on a mold shell of the matrix, the mold shell forming a mold inside and the fin plate forming a web of the negative mold, a slit being formed in the mold shell, the fin plate being inserted into the slit and attached to the mold shell, wherein the slit is formed in such a manner that it penetrates a mold wall of the mold shell and extends from the mold inside to a mold back side of the mold shell, the fin plate being bonded to the mold shell from the mold back side.

16. The method according to claim 15, wherein the fin plate is inserted into the slit from the mold inside.

17. The method according to claim 15, wherein a first portion of the slit is formed from the mold inside and a second portion of the slit, which ends in the first portion, is formed from the mold back side.

18. The method according to claim 15, wherein the fin plate is welded to the mold shell, a weld being formed in the slit on the mold back side.

Description

[0035] Hereinafter, preferred embodiments of the disclosure will be discussed in more detail with reference to the accompanying drawings.

[0036] FIG. 1 is a perspective view of a mold insert;

[0037] FIG. 2 is a top view of the mold insert;

[0038] FIG. 3 is a sectional view of the mold insert along an axis A-A shown in FIG. 2;

[0039] FIG. 4 is a sectional view of the mold insert along an axis B-B shown in FIG. 2;

[0040] FIG. 5 is a bottom view of a matrix of the mold insert;

[0041] FIG. 6 is a side view of a fin plate of the matrix;

[0042] FIG. 7 is a sectional view of a mold insert in another embodiment.

[0043] A combination of FIGS. 1 to 5 shows a mold insert 10, which comprises a matrix 30, which has a plurality of fin plates 11 (three in the case at hand), which are each disposed in slits 13, which are formed in a mold shell 12 of matrix 30. Slits 13 extend in mold shell 12 in such a manner that they penetrate a mold wall 16 of mold shell 12 from a mold inside 14 of mold shell 12 to a mold back side 15 of mold shell 12. Furthermore, mold insert 10 comprises a support 18, which is connected to matrix 30 in a detachable manner by means of screw means 17 and which is disposed on mold back side 15 and forms a back of mold insert 10. Screw means 17 engage mold insert 10 from an underside 19 of support 18. Furthermore, mold inside 14 forms a negative mold 20 for a tire blank (not shown) to be vulcanized, profile groove webs 21 being formed on mold inside 14. Fin plates 11 each also form a web 22 of negative mold 20.

[0044] Slits 13 each form a first portion 23, which is formed from mold inside 14, and a second portion 24, which is formed from mold back side 15, second portion 24 ending in first portion 23. First portion 23 has a depth 25, a depth of second portion 24 being defined by a distance 26 between mold inside 14 and mold back side 15 minus depth 25. A shape of slits 13 in first portion 23 follows a round-archshaped or undulating cross section of fin plates 11, whereas slits 13 in second portion 24 each form an oblong hole 27. This makes it possible to reduce a production time of slits 13. Furthermore, fin plates 11 are welded to mold shell 13 in slit 13 or in second portion 24 from mold back side 15, a weld (not shown) being formed in slit 13 or in second portion 24 on mold back side 15. Since fin plates 11 are welded to mold shell 12 from mold back side 15, mold inside 14 is completely free from welds. Furthermore, welding from mold back side 15 makes it possible for matrix 10 to be formed with relatively narrow spaces x, in particular between fin plates 11.

[0045] FIG. 6 shows a fin plate 11, an upper length L of fin plate 11 being greater than a length 1 of slits 13 in second portion 24, i.e., oblong holes 27. Furthermore, fin plate 11 forms a protrusion 28, which can be in contact with a shoulder (not shown) formed in each slit 13 between first portion 23 and second portion 24, and an extension 29 of fin plate 11 can protrude into second portion 24. A length (not shown) of slits 13 in first portion 23 is greater than length l.

[0046] FIG. 7 shows a mold insert 31, which comprises a matrix 32 and a support 34, which is connected to matrix 32 in a detachable manner by screw means 33 and which forms a back of mold insert 31, support 34 forming a depression 34, into which matrix 32 is inserted, on an upper side 35 of support 34. Screw means 33 engage mold insert 31 from an underside 37 of support 34. Furthermore, matrix 32 comprises two mold shells 38 in the case at hand, which each have fin plates 40, which are each inserted into slits 39, which are formed in each mold shell 38. Slits 39 each extend from a mold inside 41 of mold shells 38 to a mold back side 42 of mold shells 38. Furthermore, fin plates 40 are each welded to mold shells 38 from mold back side 42. Otherwise, mold insert 31 can be configured in the same manner as mold insert 10, which is why reference is additionally made to the explanations made with regard to FIGS. 1 to 6.