JP2006248128A - Manufacturing method of mold for vulcanizing tire and mold for vulcanizing tire manufactured by this method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a mold for vulcanizing a tire which can improve an yield in die casting and decrease a work spare of a first shot piece, and to provide a mold for vulcanizing a tire manufactured by the manufacturing method. <P>SOLUTION: In the embobiment of the invention, a work depth H of a sipe-releasing groove 3 of the first shot is formed in accordance with a casting depth of a sipe 4. The work depth Ha of the sipe-releasing groove 3 is preferably equal to the casting depth of the sipe 4, and the embodiment of the invention shows that the work depth Ha of the sipe-releasing groove 3 is set at the casting depth of the sipe 4±0.5 mm. The work portion of the sipe-releasing groove 3 is worked at least in a part of the sipe 4 casting part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a tire vulcanization molding die and a tire vulcanization molding die manufactured by the manufacturing method, and more particularly, to improve the yield of die casting and to prepare a processing spare for the first shot piece. The present invention relates to a tire vulcanization mold manufacturing method that can be reduced and a tire vulcanization mold manufactured by the manufacturing method.

  Conventionally, a piece formed by dividing a tire tread pattern into a plurality of sections is cast and laminated in several shots by die casting, and finely formed by solidification shrinkage of a metal material between the piece block pieces. When manufacturing a tire vulcanization molding die having a clear gap, there is a method of processing the relief groove 3 of the sipe cast portion 2 in the piece block 1 formed by the first shot as shown in FIGS. It has been proposed (see, for example, Patent Document 1).

However, in the conventional method, when the sipe 4 is cast by die casting, the sipe 4 sinks and the sipe depth H cannot reach the specified depth h, and the yield of the tire vulcanization mold deteriorates. It turns out that it becomes the cause of.
JP 2001-150455 A

  The present invention has been devised by paying attention to such conventional problems, and is capable of producing a die for tire vulcanization molding that can improve the yield of die casting and reduce the processing reserve of the first shot piece. It is an object of the present invention to provide a method and a tire vulcanization mold manufactured by the method.

  In order to achieve the above object, according to the present invention, the tire vulcanization molding die manufacturing method according to the present invention is configured such that when a sipe is cast into a piece, the processing depth of the sipe relief groove of the first shot is determined by the sipe casting depth. The gist is to form it corresponding to the thickness.

  Here, the processing depth of the sipe escape groove is set to ± 0.5 mm of the casting depth of the sipe, and the processed portion of the sipe escape groove is processed into at least a part of the casting portion of the sipe.

  A tire vulcanization mold according to the present invention is a mold manufactured by casting a sipe by the method for manufacturing a tire vulcanization mold described above.

  Thus, by comprising, a sipe does not sink more than a setting, the yield of die-casting can be improved, and this can reduce the processing reserve of a 1st shot piece.

  In this invention, when casting a sipe into a piece as described above, the processing depth of the sipe relief groove of the first shot is formed corresponding to the casting depth of the sipe, so that the yield of die casting is improved, There is an effect that processing reserve of the first shot piece can be reduced.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same component as a prior art example, and description is abbreviate | omitted.

  FIG. 1 is an enlarged front view of a sipe used in the method for manufacturing a tire vulcanization mold according to the present invention, FIG. 2 is a partial cross-sectional view in which a sipe 4 is disposed on a piece block 1 of a first shot, and FIG. The cross-sectional explanatory drawing of the escape groove 3 of the sipe casting portion 2 is shown. In the embodiment of the present invention, the processing depth H of the sipe escape groove 3 of the first shot is formed corresponding to the casting depth of the sipe 4. is there.

  In FIG. 1, reference numeral 2 denotes a cast portion of the sipe 4, and F denotes a profile line.

  That is, the processing depth Ha of the sipe escape groove 3 is preferably the same as the casting depth of the sipe 4, and in this embodiment, the processing depth Ha of the sipe escape groove 3 is ±± of the casting depth of the sipe 4. It is set to 0.5 mm, and the processed portion of the sipe relief groove 3 is processed into at least a part of the cast portion of the sipe 4.

  If the processing depth Ha of the sipe escape groove 3 is deeper than 0.5 mm, the sipe 4 becomes shallower by 0.5 mm or more, which may result in a defective piece block 1. The sipe 4 is embedded in the first shot by casting pressure up to -0.5 mm, but if it is shallower than -0.5 mm, the piece block 1 of the sipe 4 and the first shot may be damaged.

  Therefore, it is desirable to form the processing depth Ha of the sipe relief groove 3 of the first shot in accordance with the casting depth of the sipe 4.

  The tire vulcanization mold according to the present invention is manufactured by casting a sipe by the above-described tire vulcanization mold manufacturing method, thereby improving the yield of die casting.

  Thus, by comprising, the sipe 4 does not sink more than a setting, the yield of die-casting can be improved, and the processing reserve of a 1st shot piece can be reduced by this.

It is an enlarged front view of the sipe used for the manufacturing method of the tire vulcanization mold of this invention. FIG. 3 is a partial cross-sectional view in which a sipe is arranged in a piece block of a first shot of the present invention. It is sectional explanatory drawing of the escape groove | channel of the sipe cast-in part of this invention. It is the partial cross section figure which has arrange | positioned the sipe to the piece block of the conventional 1st shot. It is sectional explanatory drawing of the escape groove | channel of the conventional sipe cast-in part.

Explanation of symbols

1 piece block 2 sipe cast-in part 3 relief groove 4 sipe H sipe depth Ha machining depth F profile line

Claims (4)

In the method for manufacturing a mold for tire vulcanization molding, in which a piece is cast in multiple shots by die casting,
A method for manufacturing a tire vulcanization mold, wherein when a sipe is cast into the piece, a processing depth of a sipe relief groove of the first shot is formed in accordance with a casting depth of the sipe. The method for manufacturing a mold for tire vulcanization molding according to claim 1, wherein a processing depth of the sipe escape groove is set to ± 0.5 mm of a casting depth of the sipe. The method for manufacturing a mold for tire vulcanization molding according to claim 1 or 2, wherein the processed part of the sipe relief groove is processed into at least a part of a cast part of the sipe. A tire vulcanization mold in which a sipe is cast by the method for manufacturing a tire vulcanization mold according to claim 1, 2 or 3.

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