WO2019163213A1

WO2019163213A1 - Tire molding mold, method for manufacturing tire molding mold, and tire

Info

Publication number: WO2019163213A1
Application number: PCT/JP2018/041404
Authority: WO
Inventors: 石原　泰之; 小林　直人
Original assignee: 株式会社ブリヂストン
Priority date: 2018-02-22
Filing date: 2018-11-07
Publication date: 2019-08-29
Also published as: JP2019142165A; CN114851445A; CN111757800A; JP6993262B2; CN114851445B

Abstract

A tire molding mold comprising: a body part that is provided with a tread pattern forming body composed of a plurality of pattern forming body pieces arranged in a circumferential direction of the tire molding mold, and that forms a pattern of a tread surface of a tire, the pattern forming body pieces molding an outside contour of the tread surface of the tire; and a plurality of ridge parts that extend in a radial direction of the tire molding mold from the body part and form a groove shape on the tread surface of the tire, the plurality of ridge parts including a first ridge part and a second ridge part extending so as to intersect the first ridge part. The first ridge part is provided in a lateral surface thereof with a concave part extending in the radial direction of the tire molding mold. The second ridge part is provided at an end thereof with a connecting part having a shape fitting in the concave part. The connecting part is fitted in the concave part.

Description

Tire molding die, method for manufacturing tire molding die, and tire

The present invention relates to a tire mold, a method for manufacturing a tire mold, and a tire.

Conventionally, a tire is manufactured by vulcanizing and molding an unvulcanized green tire made of various rubber members using a tire molding die. In a tire molding die, bones, blades, and the like (projections) for providing various grooves, sipes, and the like on the tread surface are provided on the tread surface with which the tread surface of the tire is formed.

As for the bones and blades provided on the tread mold attachment surface of the tire molding die, the bones and blades are generally implanted in a main body part that has been previously molded by machining (for example, Patent Document 1), or the main body At the same time that the part is molded by casting, it is provided by casting the bone, blade or the like (for example, Patent Document 2).

JP 2012-006404 A JP 2004-216622 A

In recent years, the tire tread pattern tends to become more complex as further improvements in tire performance are desired. In order to mold a tire having a complicated tread pattern, a tire molding die having a tread mold-attached surface corresponding to the complicated tread pattern is required. However, it is difficult to manufacture such a die. In some cases, there was a problem with the strength of the mold.

Accordingly, an object of the present invention is to provide a tire molding die that can be easily manufactured and has improved strength.

Also, an object of the present invention is to provide a method for manufacturing a tire molding die that can easily obtain a tire molding die having improved strength.

Furthermore, an object of the present invention is to provide a tire that can be easily manufactured even if it has a complicated tread pattern.

In the first aspect, the tire molding die according to the present invention includes a tread die attachment body that includes a plurality of die attachment pieces arranged in a circumferential direction of the tire molding die and molds the tread surface of the tire. The mold-attached piece molds the outer contour of the tread surface of the tire, and extends from the main body portion in the radial direction of the tire molding die to give a groove shape to the tread surface of the tire. A plurality of ridges, and the plurality of ridges include a first ridge and a second ridge that extends across the first ridge. In the mold, the first protrusion includes a recess extending in a radial direction of the tire molding mold on a side surface of the first protrusion, and the second protrusion includes the first protrusion. A connection portion having a shape that fits into the recess is provided at the end of the two protrusions, and the connection portion is fitted into the recess. Characterized in that it is.

In the present specification, “fit” means that the concave inner shape of the first protrusion and the outer shape of the connection part of the second protrusion match, It means a state that is completely and completely supplemented by the connecting portion.

The tire of the present invention is manufactured using the tire molding die according to the first aspect.

In a second aspect, the tire molding die according to the present invention includes a tread die attachment body that is formed of a plurality of attachment body pieces arranged in a circumferential direction of the tire molding die and molds the tread surface of the tire. The mold-attached piece molds the outer contour of the tread surface of the tire, and extends from the main body portion in the radial direction of the tire molding die to give a groove shape to the tread surface of the tire. A plurality of ridges, and the plurality of ridges include a first ridge and a second ridge that extends across the first ridge. When the mold portion corresponding to one pitch of the tread pattern applied to the tread surface of the tire is a mold minimum unit, the first protrusion is at least in the mold minimum unit. At least a part of the portion and at least the second protrusion Parts and is characterized in that it is formed integrally.

The method for manufacturing a mold for molding a tire according to the present invention includes a tread mold appendage that molds a tread surface of a tire and includes a plurality of mold appendage pieces arranged in a circumferential direction of the tire mold. The piece is formed of a plurality of protrusions that shape the outer contour of the tread surface of the tire and that extend in the radial direction of the tire molding die from the main body portion to give a groove shape to the tread surface of the tire. And a plurality of protrusions including a first protrusion and a second protrusion extending across the first protrusion. A method for producing a mold for molding a tire for obtaining a mold portion corresponding to one pitch of a tread pattern applied to a tread surface of the tire as a minimum unit of the mold. At least one of the first protrusions in the mold minimum unit And at least a part of the second ridge portion are integrally formed with a ridge portion forming step, and a groove for installing the integrally formed ridge portion in the main body portion of the die-attached body piece. A groove forming step of forming, and a ridge portion installing step of inserting the integrally formed ridge portion into the groove are included in this order.

The tire of the present invention is manufactured using the tire molding die according to the second aspect.

According to the present invention, it is possible to provide a tire molding die that can be easily manufactured and has improved strength.

Further, according to the present invention, it is possible to provide a method for manufacturing a tire molding die that can easily obtain a tire molding die having improved strength.

Furthermore, according to the present invention, it is possible to provide a tire that can be easily manufactured even if it has a complicated tread pattern.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram schematically showing an entire tire molding die according to an embodiment of the present invention. 1 is a perspective view showing a die-attached body piece of a tire molding die according to an embodiment of the present invention. It is a side view of the 1st protrusion part of the die attachment body piece shown in FIG. It is sectional drawing which follows the AA line of FIG. 3A. FIG. 3B is a sectional view taken along line BB in FIG. 3A. It is a front view of the 2nd protrusion part of the die attachment body piece shown in FIG. It is a side view of the 2nd protrusion part of the die attachment body piece shown in FIG. FIG. 4B is a cross-sectional view taken along the line CC of FIG. 4A. FIG. 3 is a cross-sectional view taken along the line DD in FIG. 2. It is a figure which shows the modification of the 1st protrusion part of the die attachment body piece shown in FIG. It is a perspective view which shows the die attachment body piece of the metal mold | die for tire molding which concerns on other embodiment of this invention. It is a side view of the 1st protrusion part of the die attachment body piece shown in FIG. It is sectional drawing which follows the EE line | wire of FIG. 8A. It is sectional drawing which follows the FF line | wire of FIG. 8A. It is a front view of the 2nd protrusion part of the die attachment body piece shown in FIG. It is a side view of the 2nd protrusion part of the die attachment body piece shown in FIG. It is sectional drawing which follows the GG line of FIG. 9A. It is a figure which shows the modification of the 2nd protrusion part of the die attachment body piece shown in FIG. It is a figure which shows the modification of the 1st protrusion part of the die attachment body piece shown in FIG. FIG. 6 is a perspective view showing a die-attached body piece of a tire molding die according to still another embodiment of the present invention. It is a side view of the 1st protrusion part of the die attachment body piece shown in FIG. It is sectional drawing which follows the HH line of FIG. 13A. It is sectional drawing which follows the II line | wire of FIG. 13A. It is a front view of the 2nd protrusion part of the die attachment body piece shown in FIG. It is a side view of the 2nd protrusion part of the die attachment body piece shown in FIG. It is sectional drawing which follows the JJ line of FIG. 14A. It is sectional drawing which follows the KK line | wire of FIG. It is a figure which shows the modification of the 1st protrusion part of the die attachment body piece shown in FIG. FIG. 6 is a perspective view showing a die-attached body piece of a tire molding die according to still another embodiment of the present invention. It is a front view of the 1st protrusion part of the die attachment body piece shown in FIG. It is sectional drawing which follows the LL line of FIG. 18A. It is sectional drawing which follows the MM line | wire of FIG. 18A. It is a front view of the 2nd protrusion part of the die attachment body piece shown in FIG. It is a side view of the 2nd protrusion part of the die attachment body piece shown in FIG. FIG. 19B is a cross-sectional view taken along line NN in FIG. 19A. It is a figure which shows the modification of the 1st protrusion part of the die attachment body piece shown in FIG. FIG. 6 is a perspective view showing a die-attached body piece of a tire molding die according to still another embodiment of the present invention. It is a perspective view of the protrusion part of the die attachment body piece shown in FIG. FIG. 22 is a cross-sectional view taken along the line OO in FIG. 21. FIG. 22 is a cross-sectional view taken along the line PP in FIG. 21. It is a top view of the main-body part of the die-attached body piece shown in FIG. It is a modification of a protrusion part of the die attachment body piece shown in FIG. It is the further another modification of a protrusion part of the die attachment body piece shown in FIG. It is the further another modification of a protrusion part of the die attachment body piece shown in FIG. It is the further another modification of a protrusion part of the die attachment body piece shown in FIG. It is the further another modification of a protrusion part of the die attachment body piece shown in FIG. It is the further another modification of a protrusion part of the die attachment body piece shown in FIG. It is the further another modification of a protrusion part of the die attachment body piece shown in FIG. FIG. 6 is a perspective view showing a die-attached body piece of a tire molding die according to still another embodiment of the present invention. It is a perspective view of the protrusion part of the die attachment body piece shown in FIG. It is a top view of the main-body part of the shaping | molding body piece shown in FIG. FIG. 6 is a perspective view showing a die-attached body piece of a tire molding die according to still another embodiment of the present invention. It is a perspective view of a protrusion part of the die attachment body piece shown in FIG. It is a top view of the main-body part of the shaping | molding body piece shown in FIG. It is a perspective view which shows the die-attachment piece of the conventional metal mold | die for tire molding. It is an expansion explanatory drawing which expands and demonstrates a part of die | attachment body piece of FIG. It is an expansion explanatory drawing which expands and demonstrates a part of die | attachment body piece of FIG.

Hereinafter, an embodiment of a tire according to the present invention will be described by way of example with reference to the drawings. In each figure, the same code | symbol is attached | subjected to the common member and site | part.

<Tire mold 1>
FIG. 1 is a schematic schematic view schematically showing an entire tire molding die (hereinafter also simply referred to as “die”) 100 as one embodiment of the present invention. The mold 100 includes a circumferential holder 101 that forms an outline of the mold 100, and a circumferential tread mold attachment 102 that is disposed on the inner circumferential side of the holder 101 and held by the holder 101. And. The tread-type attachment 102 is a member that molds the tread surface of the tire and imparts a tread pattern to the tread surface. A plurality of tread-type attachments 102 corresponding to the tread pattern are formed on the inner peripheral surface of the tread-type attachment 102. Ridges (not shown) are provided. In this embodiment, the holder 101 is composed of a plurality of (seven in the example of FIG. 1) holder pieces 101P divided in the circumferential direction of the mold 100 (hereinafter also simply referred to as “mold circumferential direction”). Has been. Similarly, in this embodiment, the tread mold attachment 102 is constituted by a plurality (28 pieces in the example of FIG. 1) of the mold attachment pieces 102P divided in the mold circumferential direction. In the example of FIG. 1, four die-attached body pieces 102P are held by one holder piece 101P.
In addition, the metal mold | die of this invention is not limited to the form shown in FIG. 1, The number of a holder piece and a die attachment body piece, and the number of the die attachment pieces hold | maintained at one holder piece are shape | molded. It can be appropriately changed according to the tread pattern of the tire.
Further, in the schematic schematic view of FIG. 1, the edge in the mold circumferential direction of each holder piece 101P and each mold-attached piece 102P is in the width direction of the mold 100 (hereinafter, also simply referred to as “mold width direction”). However, the circumferential edges of these molds are inclined with respect to the mold width direction according to the tread pattern of the tire, and are irregularly shaped such as zigzag or wavy. It may extend.

FIG. 2 is a perspective view showing a die-attached body piece 102P in the tire molding die 100 as one embodiment of the present invention. The die-attached body piece 102P forms the outer contour of the tread surface of the tire, and the radial direction of the mold 100 from the main body 10 (hereinafter, also simply referred to as “mold radial direction”). And a plurality of ridge portions 11 that extend and impart a groove shape to the tread surface of the tire. The ridge portion 11 includes a first ridge portion 12 and a second ridge portion 13 that extends across the first ridge portion 12.

More specifically, the protrusion 11 in this embodiment includes four first protrusions 12 extending along the mold circumferential direction and the first protrusions 12 extending outward in the mold width direction. A plurality of second ridges 13 extending along the mold width direction connecting each of the first ridges 12 and each of the first ridges 12 extending adjacent to each other in the mold width direction. And. In this example, the second ridge 13 intersects the first ridge 12 at a substantially right angle, and the end of the second ridge 13 is inserted into the side surface of the first ridge 12. Are mated. Hereinafter, the shape of the fitting part of the side surface of the 1st protrusion part 12 and the edge part of the 2nd protrusion part 13 is demonstrated. In addition, the die-attached body piece 102 in this embodiment is manufactured by arranging (implanting) the protruding portion 11 on the main body portion 10 that has been molded in advance by machining or the like.

3A is a side view of the first protrusion 12 (viewed from the mold width direction), FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A, and FIG. 3C is FIG. It is sectional drawing which follows the BB line | wire. Here, a state before the first protrusion 12 is arranged on the main body 10 is illustrated.

As shown in FIG. 3A, the first ridge 12 is a side surface of the first ridge 12, that is, a surface along the extending direction of the first ridge 12 (the thickness of the first ridge 12. (Surface orthogonal to the direction) is provided with a recess 12R extending in the radial direction of the mold. The number of the concave portions 12 R provided in the first ridge portion 12 is equal to the number of second ridge portions 13 that intersect the first ridge portion 12.

In this embodiment, the concave portion 12R is formed such that the outer side portion in the mold radial direction of the concave portion 12R is formed from a narrow width portion N12R having a constant width in the side view of the first protrusion 12, and the radial direction of the concave portion 12R is in the mold radial direction. The inner portion is formed from a wide portion W12R (in this example, a modified pentagonal shape) that is wider than the narrow portion N12R.

In addition, since the recess 12R is formed according to the end face shape of the connection portion 13C of the second protrusion 13 described later, the shape of the recess 12R is the same as that of the connection portion 13C of the second protrusion 13. It can change suitably according to an end surface shape.

Further, as shown in FIG. 3B, the first protrusion 12 in this embodiment has a flask-like cross-sectional shape having a thick portion TP12 on the inner side in the mold radial direction. More specifically, the first ridge portion 12 has an outer portion in the mold radial direction of the first ridge portion 12 formed from a thin portion NP12 having a constant width, and the mold diameter of the first ridge portion 12 is the same. The inner portion in the direction is formed from a thick portion TP12 that swells locally.

Further, as shown in FIG. 3C, the depth of the recess 12 R in this embodiment (the length along the thickness direction of the first protrusion 12) is less than half of the thickness of the first protrusion 12. . If the depth of the recess 12R is less than half the thickness of the first protrusion 12, the strength of the first protrusion 12 can be improved.

In this example, the plurality of concave portions 12R described above are formed on one side surface of the first ridge portion 12, but in another example, a plurality of concave portions are formed on both side surfaces of the first ridge portion. May be formed.

4A is a front view of the second protrusion 13 (viewed from the mold circumferential direction), and FIG. 4B is a side view of the second protrusion 13 (viewed from the mold width direction). FIG. 4C is a cross-sectional view of the plane along the line CC in FIG. 4A. Here, the state before arranging the 2nd protrusion part 13 in the main-body part 10 is illustrated.

As shown in FIGS. 4A and 4B, the second ridge 13 is provided on the side of the first ridge 12 at the end of the second ridge 13 (both ends in this embodiment). In addition, a connecting portion 13C having a shape that fits into the concave portion 12R (the boundary of the connecting portion 13 is indicated by a broken line in the figure) is provided.

That is, the shape (see FIG. 4B) of the end surface of the connection portion 13C of the second ridge portion 13 is a surface that contacts the end surface of the second ridge portion 13 of the recess 12R of the first ridge portion 12 (this example). Then, the shape (refer to FIG. 3A) of the surface along the circumferential direction of the mold (see FIG. 3A), and the shape (refer to FIG. 4A) of the surface orthogonal to the end surface of the connection portion 13C of the second protrusion 13 is In accordance with the shape (refer to FIG. 3C) of the surface (in this example, the surface along the mold width direction) orthogonal to the surface of the recess 12R of the first protrusion 12 that is in contact with the end surface of the first protrusion. Yes. Furthermore, the volume of the connection portion 13 C of the second protrusion 13 is equal to the volume of the recess 12 R of the first protrusion 12.

As shown in FIG. 4C, the central portion of the second protrusion 13 in this embodiment has a flask-like cross-sectional shape having a thick portion TP13 on the inner side in the mold radial direction. The second ridge portion 13 is formed such that a portion in the mold radial direction of the second ridge portion 13 is formed from a thin portion NP13 having a constant width, and a portion in the mold radial direction of the second ridge portion 13 is It is formed from a thick portion TP13 that swells locally.

Thus, in the 2nd protrusion part 13 in this embodiment, the shape of the center part of this 2nd protrusion part 13 and the connection part 13C provided in the edge part of the said 2nd protrusion part 13 is the shape. Although different, the central portion CR13 and the end portion ER13 are continuously and integrally formed.

In the die-attached body piece 102P, the connection portion 13C provided at the end of the second ridge portion 13 is fitted into the recess 12R provided on the side surface of the first ridge portion 12, and thereby, The 2nd protrusion 12 and the 2nd protrusion 13 are connected.

FIG. 5 is a cross-sectional view of the surface along the line DD in FIG. In the die-attached body piece 102P, after the first protrusion 12 is disposed on the main body 10 of the die-attached body piece 102P, the second protrusion 13 is provided on the side surface of the first protrusion 12. The first protrusion 12 and the second protrusion 12 are connected to each other by being inserted into the first protrusion 12 from the inside in the mold radial direction to the outside through the recess 12R. The As shown in FIG. 5, the connecting portion 13 C of the second protruding portion is fitted into the recessed portion 12 R of the first protruding portion 12, so that the recessed portion 12 R is completely compensated by the connecting portion 13 C without excess or deficiency. Has been.

In this configuration, the shape of the recess 12R formed on the side surface of the first protrusion 12 and the shape of the protrusion 13C formed at the end of the second protrusion 13 are completely the same. By simply inserting the convex portion 13C into the concave portion 12R, the connection and fixing of the first protruding portion 12 and the second protruding portion 13 are completed. From this, in the metal mold | die 100 of this embodiment, compared with the former, a metal mold | die can be manufactured easily and the intensity | strength of a metal mold | die can be improved.

FIG. 32 is a perspective view showing a die-attached body piece 902P of a conventional tire molding die 900. FIG. This die-attached body piece 902P is manufactured by implanting a plurality of protrusions 91 in a main body 90 pre-formed by machining, like the die-attached body piece 102P according to one embodiment of the present invention described above. The plurality of ridge portions 91 include a first ridge portion 92 and a second ridge portion 93 extending so as to intersect with the first ridge portion 92. In this conventional die-attached body piece 902P, a recess 92R extending in the mold radial direction is provided on the side surface of the first protrusion 92, and the end of the second protrusion 93 is inserted into the recess 92R. Thus, the first ridge 92 and the second ridge 93 are connected.
However, in this conventional die-attached body piece 902P, the end of the second protrusion 93 is not given a shape that fits into the recess 92R. Therefore, a gap V corresponding to the difference between the volume of the recess 92R and the volume of the end of the second protrusion 93 inserted into the recess 92R is generated in the recess 92R of the first protrusion 92. (See FIG. 33A), and the gap V is compensated by, for example, overlay welding (see “welded portion W” in FIG. 33B). Furthermore, the compensated welded portion W is trimmed into the outer shape of the first protruding portion by blasting or the like, and the protruding portion 91 is formed.
As described above, in the conventional die-attached body piece 902P, after the first protrusion 92 and the second protrusion 93 are disposed, the intersection of the first protrusion 92 and the second protrusion 93 is performed. It was necessary to perform a welding process for filling the gap V in the part and a blasting process for adjusting the shape of the welded part.

On the other hand, in the die-attached body piece 102P according to the embodiment of the present invention, as described above, the end of the second protrusion 13 is fitted into the recess 12R provided on the side surface of the first protrusion 12. Since the connecting portion 13C having a matching shape is provided, and the connecting portion 13C is fitted into the first recess 12R, and the recess 12R is completely and fully filled, so that conventional welding and The protrusion 11 can be formed without performing the blasting process.
Therefore, in the metal mold | die which concerns on this embodiment, a metal mold | die can be manufactured easily compared with the former, and the intensity | strength of a metal mold | die can be improved.

In the above-described embodiment, the first protrusion 12 is a protrusion member for providing a circumferential groove on the tread surface of the tire, and the second protrusion 13 intersects the circumferential groove. In the mold of the present invention, the first protrusion and the second protrusion, and the protrusion for providing the circumferential groove and / or the width groove on the tread surface of the tire are provided. It can be set as arbitrary members, such as a member or a blade member for providing a sipe.

The configuration of the above-described embodiment is the case where the height H12 of the first protrusion 12 and the height H13 of the second protrusion 13 are different (that is, the first protrusion, as in the case of the embodiment). This is particularly advantageous in the case where the groove 12 is provided with different groove depths on the tread surface of the tire). This is because, generally, when the heights of the intersecting ridge portions are different, it is necessary to process the intersecting portion (such as overlay welding or blasting).

Further, the configuration of the above-described embodiment is such that the first ridge portion 12 and / or the second ridge portion 13 (both in the present embodiment) of the ridge portion are the same as the embodiment. A case where there are thick portions TP12 and TP13 (see FIG. 3B and FIG. 4C) which are thicker on the inner side in the mold radial direction than on the outer side in the mold radial direction of the protrusion (that is, the tread of the tire by the protrusion) This is particularly advantageous when the groove width of the groove provided on the tread surface is larger on the groove bottom side than on the tread surface side. In general, when such a ridge portion is provided, it is necessary to process the intersection of the ridge portion (welding or blasting, etc.).

In this embodiment, the average thickness of the first protrusions 12 (the average thickness measured in the direction perpendicular to the extending direction of the first protrusions) is the average thickness of the second protrusions 13. However, in the mold of the present invention, the average thickness of the first ridges is set to the second ridge, although it is larger than the thickness (average of the thicknesses measured in the direction perpendicular to the extending direction of the second ridges). It can also be made smaller than the average thickness of the part.

Furthermore, FIG. 6 is a modification of the first protrusion 12 described above. That is, it is a side view of the first ridge portion 12 ′ composed of the ridge parts 12 P divided in the mold circumferential direction. Thus, it is preferable that the 1st protrusion part is comprised from the protrusion part 12P divided | segmented into the extension direction (this example circumferential direction of a metal mold | die) of this 1st protrusion part, Furthermore, It is preferable that each protrusion part 12P is disposed with a predetermined space between adjacent surfaces of adjacent protrusion parts 12P.

When a mold is manufactured by a casting method (when a ridge part is cast and manufactured), the amount of thermal expansion of the ridge part increases, and therefore a single member that continuously extends over a relatively long span is used. The member is easily deformed by thermal expansion. In this case, the intended tread pattern may not be obtained. Therefore, the first ridge portion is constituted by the ridge parts 12P divided in the mold circumferential direction, and further, by providing a predetermined space between the adjacent surfaces of the adjacent ridge parts 12P. For example, it becomes easy to avoid occurrence of distortion of the first ridge due to thermal expansion of the ridge part 12P at the time of casting and casting (this is a phenomenon that occurs even during heating during tire vulcanization). ).

As in the case of the ridge part 12P shown in FIG. 6, the ridge part 12P is provided at the recess 12R position (for example, the center position of the recess 12R) provided on the side surface of the first protrusion 12 '. It is preferable that it is divided.

In the above example, the first ridge portion 12 is constituted by the ridge part 12P divided in the extending direction of the first ridge portion 12, but in the mold of the present invention, the second ridge portion 12P When the ridge portion is a single member continuously extending over a relatively long span, the second ridge portion is constituted by a ridge part divided in the extending direction of the second ridge portion. You can also.

As mentioned above, although the die-attached body bead 102P of the mold 100 as one embodiment of the present invention has been described, the arrangement of the protrusions in the mold of the present invention is not limited to the form shown in FIG. It can be appropriately changed according to the tread pattern applied to the tread surface of the tire.

<Tire mold 2>
Next, FIG. 7 is a perspective view showing a die-attached body piece 202P in a tire molding die 200 as another embodiment of the present invention. In this mold-attached piece 202P, the description of the same configuration as the mold-attached piece 102P shown in FIG. 2 is omitted.

The die-attached body piece 202P is formed with a plurality of protrusions that shape the outer contour of the tread surface of the tire, and a groove shape that extends from the main body portion 20 in the mold radial direction to the tread surface of the tire. The ridge portion 21 includes a first ridge portion 22 and a second ridge portion 23 that extends across the first ridge portion 22. This die-attached body piece 202P is different in configuration from the above-described die-attached body piece 102P in the shape of the recess 22R provided on the side surface of the first protrusion 22 and the shape of the second protrusion 23. Yes.

FIG. 8A is a side view of the first protrusion 22 (viewed from the mold circumferential direction), and FIG.
8C is a cross-sectional view taken along line EE in FIG. 8A, and FIG. 8C is a cross-sectional view taken along line FF in FIG. 8A. Here, a state before the first protrusion 22 is arranged in the main body 20 is illustrated.

As shown in FIG. 8A, the first ridge 22 is a side surface of the first ridge 22, that is, a surface along the extending direction of the first ridge 22 (the thickness of the first ridge 22. (Surface orthogonal to the direction) is provided with a recess 22R extending in the mold radial direction. The number of the concave portions 22 R provided in the first ridge portion 22 is equal to the number of second ridge portions 23 that intersect the first ridge portion 22.

The recess 22R in this embodiment has a rectangular shape elongated in the mold radial direction when the first protrusion 22 is viewed from the side.

FIG. 9A is a front view of the second protrusion 23 (viewed from the mold circumferential direction), and FIG. 9B is a side view of the second protrusion 23 (viewed from the mold width direction). FIG. 9C is a cross-sectional view taken along the line GG in FIG. 9A. Here, the state before the 2nd protrusion part 23 is arrange | positioned in the main-body part 20 is illustrated.

As shown in FIG. 9A and FIG. 9B, the second ridge 23 is provided on the side of the first ridge 22 at the end of the second ridge 23 (in this embodiment, both ends). Further, a connecting portion 23C having a shape that fits into the recess 22R is provided.

That is, the end surface of the connection portion 23C of the second ridge portion 23 is a rectangular shape elongated in the mold radial direction (see FIG. 9B), and the recess 22R provided on the side surface of the first ridge portion 22 is It matches the shape (see FIG. 8A) of the surface (in this example, the surface along the circumferential direction of the mold) in contact with the end surface of the second protrusion 23, and the above-mentioned connection portion 23C of the second protrusion 23 The shape of the surface orthogonal to the end surface (see FIG. 9A) is a surface orthogonal to the surface of the recess 22R of the first protrusion 22 that contacts the end surface of the first protrusion (in this example, the mold width direction). The surface (see FIG. 8C). Furthermore, the volume of the connection portion 23 C of the second protrusion 23 is equal to the volume of the recess 22 R of the first protrusion 22.

As shown in FIG. 9C, the central portion of the second ridge portion 23 in this embodiment is formed from a thin portion NP23 having a constant width on the outer side in the mold radial direction of the second ridge portion 23. A bent portion in which the central portion in the mold radial direction of the second protrusion 23 is bent and extended zigzag on one side and the other side of a plane (not shown) passing through the center in the thickness direction of the second protrusion 23. The portion BP23 is formed, and the radially inner portion of the second protrusion 23 is formed from a thickened portion TP23 that swells locally.

In this way, for example, a part of the second ridge 23 is bent in a zigzag manner on one side and the other side of a plane (not shown) passing through the center of the second ridge 23 in the thickness direction. By being present, grooves or sipes extending zigzag in the groove depth direction can be formed on the tread surface of the tire.

In addition, in the 2nd protrusion part 23 in this embodiment, although the shape of the center part of this 2nd protrusion part 23 and the connection part 23C provided in the edge part of the said 2nd protrusion part 23 differs. The central portion and the end portion are formed continuously and integrally.

Similarly, in this die-attached body piece 202, the connection portion 23C provided at the end of the second protrusion 23 is fitted into the recess 22R provided in the side surface of the first protrusion 22; Thereby, the 1st protrusion part 22 and the 2nd protrusion part 23 are connected.

In this configuration, the shape of the recess 22R formed on the side surface of the first protrusion 22 and the shape of the protrusion 23C formed at the end of the second protrusion 23 are completely the same. By simply inserting the convex portion 23C into the concave portion 22R, the connection and fixing of the first and

second ridge portions

22 and 23 are completed. Therefore, in the mold 200 of this embodiment as well, the mold can be easily manufactured and the strength of the mold can be improved as compared with the conventional one.

In this die-attached body piece 200, the end surface of the second protrusion 23 having the bent portion BP23 extending in a zigzag shape is not a zigzag shape but an elongated rectangular shape (see FIG. 9B). Furthermore, since the end of the second protrusion 23 has a rectangular parallelepiped shape, the second protrusion 23 can be easily inserted into the recess 22 R provided on the side surface of the second protrusion 22.

FIG. 10 is a perspective view showing a modified example of the second protrusion 23 described above. The second protrusion 23 'is a protrusion P that extends in a direction intersecting the mold radial direction (in this embodiment, the mold circumferential direction) with respect to the connection part 23C' of the second protrusion 23 '. Is formed. Although not shown, a protrusion receiver corresponding to the protrusion P is provided in the recess 22C of the first protrusion 22. According to this structure, since 2nd protrusion part 23 'is connected with 1st protrusion part 22 more firmly, the intensity | strength of a metal mold | die can be improved more.

In addition, if the protrusion P is a direction that intersects the mold radial direction, for example, the direction orthogonal to the extending direction of the second protruding portion 23 'or the extending direction of the second protruding portion 23' is used. Or the like. Further, the protrusion P can be provided at any position as long as it is the connection portion 23C ′ of the second protrusion 23 ′. However, if the protrusion P is provided on the inner side in the mold radial direction of the connection portion 23 ′, the second protrusion It becomes easy to insert the strip 23 ′ into the first protrusion 22.

In addition, the structure of the protrusion P shown in FIG. 10 can be similarly provided in the die-attached body piece 102P in the above-described embodiment and die-attached

body pieces

302P and 402P described later.

Furthermore, FIG. 11 is a modification of the first protrusion 22 described above. That is, it is a side view of the first ridge portion 22 ′ composed of the ridge parts 22 P divided in the mold circumferential direction. For the same reason as described for the mold 100 described above, the first protrusion is preferably composed of protrusion parts 22P divided in the mold circumferential direction. It is preferable that the parts 22P are arranged with a predetermined space between the adjacent surfaces of the adjacent ridge parts 22P. This is because it is easy to avoid the occurrence of distortion or the like of the first ridge due to the thermal expansion of the ridge part 22P during the casting of the mold.

As is the case with the ridge part 22P shown in FIG. 11, the ridge part 22P is provided at the position of the recess 22R (for example, the center position of the recess 22R) provided on the side surface of the first protrusion 22 '. It is preferable that it is divided.

<Tire mold 3>
FIG. 12 is a perspective view showing a die-attached body piece 302P in a tire molding die 300 as another embodiment of the present invention. In this mold attachment piece 302P, the description of the same configuration as the mold attachment piece 102P shown in FIG. 2 and / or the mold attachment piece 202P shown in FIG. 7 is omitted.

The die-attached body piece 302P is formed with a plurality of protrusions that mold the outer contour of the tread surface of the tire, and a groove shape that extends from the main body portion 30 in the mold radial direction to the tread surface of the tire. The ridge portion 31 includes a first ridge portion 32 and a second ridge portion 33 that extends across the first ridge portion 32. The mold-attached piece 302P is different in configuration from the above-described mold-attached

pieces

102P and 202P in the shape of the recess 32R of the first protrusion 32 and the shape of the second protrusion 33. In addition, the die-attached piece 302P is manufactured by molding the main body 30 by casting (in this example, cast gypsum method) and simultaneously casting the protruding portion 31. It is different from the attached

pieces

102P and 202P.

13A is a front view of the first protrusion 32 (viewed from the circumferential direction of the mold), FIG. 13B is a cross-sectional view taken along the line HH of FIG. 13A, and FIG. 13C is FIG. It is sectional drawing which follows the II line | wire. Here, the state before the 1st protrusion part 32 is cast in the main-body part 30 is illustrated.

As shown in FIG. 13A, the first ridge portion 32 is a side surface of the first ridge portion 32, that is, a surface along the extending direction of the first ridge portion 32 (the thickness of the first ridge portion 32. (Surface orthogonal to the direction) is provided with a recess 32R extending in the mold radial direction. The number of the recesses 32 R provided in the first protrusion 32 is equal to the number of the second protrusions 33 that intersect with the first protrusion 32.

In this embodiment, the concave portion 32R has a radially outer portion in the mold radial direction formed from a narrow width portion N32R having a constant width in a side view of the first protrusion 32, and a radially inner portion of the concave portion 32R. However, it is formed from a wide portion W32R (in this example, a drop shape) wider than the narrow portion N32R.

14A is a front view of the second protrusion 33 (viewed from the mold circumferential direction), and FIG. 14B is a side view of the second protrusion 33 (viewed from the mold width direction). FIG. 14C is a cross-sectional view of the plane along the line JJ in FIG. 14A. Here, the state before the 2nd protrusion part 33 is arrange | positioned in the main-body part 30 is illustrated.

As shown in FIGS. 14A and 14B, the second ridge 33 is provided on the side of the first ridge 32 at the end of the second ridge 33 (in this embodiment, both ends). In addition, a connecting portion 33C having a shape that fits into the concave portion 32R is provided.

That is, the shape (see FIG. 14B) of the end surface of the connection portion 33C of the second ridge portion 33 is a surface that contacts the end surface of the second ridge portion 33 of the recess 32R of the first ridge portion 32 (this example). Then, the shape (refer to FIG. 13A) of the surface along the circumferential direction of the mold) (see FIG. 13A), the shape of the surface orthogonal to the end surface of the connecting portion 33C of the second protrusion 33 (refer to FIG. 14A) It corresponds to the shape (refer to FIG. 13C) of the surface (in this example, the surface along the mold width direction) orthogonal to the surface of the recess 32R of the first protrusion 32 that contacts the end surface of the first protrusion 31. ing. Further, the volume of the connection portion 33 C of the second protrusion 33 is equal to the volume of the recess 32 R of the first protrusion 32.

In the die-attached body piece 302P, the connection portion 33C provided at the end of the second protrusion 33 is fitted in the recess 32R provided on the side surface of the first protrusion 32. The 2nd protrusion 32 and the 2nd protrusion 33 are connected.

Further, FIG. 15 is a cross-sectional view of the surface along the line KK of FIG. As shown in FIG. 15, the connecting portion 33C of the second protruding portion is fitted into the recessed portion 32R of the first protruding portion 32, so that the recessed portion 32R is completely compensated by the connecting portion 33C without excess or deficiency. Has been.

In this configuration, the shape of the recess 32R formed on the side surface of the first protrusion 32 and the shape of the protrusion 33C formed at the end of the second protrusion 33 are completely the same. Since the 1 protrusion part 32 and the 2nd protrusion part 33 are connected with the said fitting mutual, while being able to manufacture a metal mold | die easily, the intensity | strength of a metal mold | die can be improved.

Although not shown in the drawings, conventionally, when a die-attached piece is manufactured by a cast plaster method, the first protrusion and the second protrusion are aligned with each other, and then the main body of the die-attached piece is formed. The molten metal such as aluminum alloy is filled and solidified so that they are fixed to each other. That is, the first protrusion and the second protrusion are only attached to each other, and have no fitting or meshing structure. According to the gypsum casting method, a mold can be easily manufactured as compared with a manufacturing method in which a main body portion of a die-attached body piece is molded and then a protrusion is disposed on the main body portion (post-planting). On the other hand, there was a case where the strength of the mold had a problem.

In the die-attached body piece 302P according to this embodiment, the first protrusion 32 and the second protrusion 33 are fitted to each other, so that the mold is easily manufactured and is manufactured by casting. The strength of the mold can be improved.

In the die-attached body piece 302 manufactured by casting, unlike the above-described die-attached body pieces 102 and 202, the second protrusion 33 is not inserted from the inside of the first protrusion 32 in the mold radial direction. In addition, since these intersecting ridge portions can be connected in advance, the shape of the concave portion 32R of the first ridge portion 32 and the shape of the connection portion 33C of the second ridge portion 33 can be minimized. Can do. Therefore, it becomes easier to manufacture the mold.

FIG. 16 shows a modification of the first protrusion 32 described above. That is, it is a side view of the first ridge portion 32 ′ composed of the ridge parts 32 P divided in the mold circumferential direction. For the same reason as described for the

molds

100 and 200 described above, the first protrusion is preferably composed of protrusion parts 32P divided in the mold circumferential direction. It is preferable that the ridge part 32P is disposed with a predetermined space between adjacent surfaces of the adjacent ridge parts 32P. This is because it is easy to avoid the occurrence of distortion or the like of the first protrusion due to the thermal expansion of the protrusion part 22P at the time of die casting.

As in the case of the ridge part 32P shown in FIG. 16, the ridge part 32P is provided at the position of the recess 32R (for example, the center position of the recess 22R) provided on the side surface of the first protrusion 32 '. It is preferable that it is divided.

<Tire molding die 4>
FIG. 17 is a perspective view showing a die-attached body piece 402P in a tire molding die 400 as another embodiment of the present invention. In this die-attached piece 402P, the description of the same configuration as the die-attached

pieces

102P, 202P, 302P described above is omitted.

The die-attached body piece 402P is formed with a plurality of protrusions that shape the outer contour of the tread surface of the tire, and a groove shape that extends from the main body portion 40 in the mold radial direction to the tire tread surface. The ridge portion 41 includes a first ridge portion 42 and a second ridge portion 43 that extends across the first ridge portion 42. This mold attachment piece 402P is different from the above-mentioned

mold attachment pieces

102P, 202P, and 302P in the shape of the recess 42R provided on the side surface of the first protrusion 42 and the shape of the second protrusion 43. The configuration is different.

18A is a side view of the first protrusion 42 (viewed from the mold circumferential direction), FIG. 18B is a cross-sectional view taken along line LL of FIG. 18A, and FIG. 8C is FIG. It is sectional drawing which follows the MM line | wire. Here, a state before the first protrusion 42 is arranged on the main body 40 is illustrated.

As shown in FIG. 18A, the first protrusion 42 is a side surface of the first protrusion 42, that is, a surface along the extending direction of the first protrusion 42 (the thickness of the first protrusion 42). (Surface orthogonal to the direction) is provided with a recess 42R extending in the radial direction of the mold. The number of the recesses 42 R provided in the first protrusion 42 is equal to the number of the second protrusions 43 that intersect the first protrusion 42.

Further, in this example, the concave portion 42R is an elongated rectangular shape in the mold radial direction in a side view of the first protrusion 42, but the end portion on the inner side in the mold radial direction is formed in an arch shape. Yes.

19A is a front view of the second protrusion 43 (viewed from the mold circumferential direction), and FIG. 19B is a side view of the second protrusion 43 (viewed from the mold width direction). FIG. 19C is a cross-sectional view taken along line NN in FIG. 19A. Here, the state before arranging the 2nd protrusion part 43 in the main-body part 40 is illustrated.

As shown in FIGS. 19A and 19B, the second protrusion 43 is provided on the end of the second protrusion 43 (both ends in this embodiment) on the side surface of the first protrusion 42. Further, a connecting portion 43C having a shape that fits into the concave portion 42R is provided.

That is, the end surface of the connection portion 43C of the second ridge portion 43 is a rectangular shape elongated in the mold radial direction (see FIG. 19B), and the concave portion 42R provided on the side surface of the first ridge portion 42, It matches the shape (see FIG. 18A) of the surface (in this example, the surface along the circumferential direction of the mold) that contacts the end surface of the second ridge 43, and the above-mentioned connection portion 43 C of the second ridge 43. The shape of the surface orthogonal to the end surface (see FIG. 19A) is the surface orthogonal to the surface of the recess 42R of the first protrusion 42 that contacts the end surface of the first protrusion (in this example, the mold width direction). The surface (see FIG. 18C). Furthermore, the volume of the connection portion 43 C of the second protrusion 43 is equal to the volume of the recess 42 R of the first protrusion 42.

In addition, as shown in FIG. 19C, the central portion of the second protrusion 43 in this embodiment is formed from a thin portion NP43 having a constant width at the outer side in the mold radial direction of the second protrusion 43. A mold radial direction central portion of the second protrusion 43 is bent and extended in a zigzag manner on one side and the other side of a plane (not shown) passing through the center in the thickness direction of the second protrusion 43. It is formed from the bent part BP43, and the radially inner portion of the second protrusion 43 is formed from a thick part TP43 that is locally swollen.

In this way, a part of the second protrusion 43 is bent and extended in a zigzag manner on one side and the other side of a plane (not shown) passing through the center of the second protrusion 43 in the thickness direction, for example. By being present, grooves or sipes extending zigzag in the groove depth direction can be formed on the tread surface of the tire.

In addition, in the 2nd protrusion 43 in this embodiment, although the shape of the center part of this 2nd protrusion 43 and the connection part 43C provided in the edge part of the said 2nd protrusion 43 differs. The central portion and the end portion are formed continuously and integrally.

Similarly, in this die-attached body piece 402, the connection portion 43C provided at the end of the second protrusion 43 is fitted in the recess 42R provided on the side surface of the first protrusion 42, Thereby, the 1st protrusion part 42 and the 2nd protrusion part 43 are connected.

FIG. 20 is a modification of the first protrusion 42 described above. That is, it is a side view of the first ridge portion 42 ′ composed of the ridge parts 42 P divided in the mold circumferential direction. For the same reason as described for the

molds

100, 200, and 300 described above, the first protrusion is preferably composed of protrusion parts 42P divided in the mold circumferential direction. Each protrusion part 42P is preferably disposed with a predetermined space between adjacent surfaces of adjacent protrusion parts 42P. This is to make it easier to avoid the occurrence of distortion or the like of the first ridge due to the thermal expansion of the ridge part 42P at the time of casting the mold.

As is the case with the ridge part 42P shown in FIG. 20, the ridge part 42P is provided at the recess 42R position (for example, the center position of the recess 42R) provided on the side surface of the first protrusion 42 '. It is preferable that it is divided.

<Method 1 of manufacturing mold for tire molding>
Note that the die-attached

body pieces

102P, 202P, 302P, and 402P in the above-described

molds

100, 200, 300, and 400 are recessed portions that extend in the mold radial direction on the side surfaces of the

first protrusions

12, 22, 32, and 42, respectively. 12R, 22R, 32R, 43R forming step, and a connecting portion having a shape that fits into the

recesses

12R, 22R, 32R, 42R at the ends of the

second protrusions

13, 23, 33, 43 13C, 23C, 33C, 43C, a connecting portion forming step, and a fitting step of fitting the connecting

portions

13C, 23C, 33C, 43C into the

recesses

12R, 22R, 32R, 43R. Can be obtained. According to this mold manufacturing method, a tire molding mold with improved strength can be easily obtained.

Further, in the above-described manufacturing method, prior to the fitting step, the protrusions extending in the direction intersecting the mold radial direction are provided at the ends of the

second protrusions

13, 23, 33, and 43. It is preferable to further include a forming step and a protrusion receiving step of providing a protrusion receiver corresponding to the protrusion P in the

recesses

12R, 22R, 32R, and 42R of the

first protrusions

12, 22, 32, and 42. According to this mold manufacturing method, a tire molding mold with improved strength can be obtained.

Furthermore, in the tire manufactured using the

tire molds

100, 200, 300, and 400 described above, the

first protrusions

12, 22, 32, and 42 of the die-

attachment pieces

102P, 202P, 302P, and 402P are used. And since it is manufactured using

molds

100, 200, 300, 400 that can be manufactured simply by assembling the parts forming the

second protrusions

13, 23, 33, 43, it has a complicated tread pattern. However, it can be manufactured easily.

<Tire mold 5>
FIG. 21 is a perspective view showing a die-attached body piece 502P in a tire molding die 500 as another embodiment of the present invention. In this die-attached piece 502P, description of the same configuration as the die-attached pieces 102P to 402P described above is omitted.

The die-attached body piece 502P is formed with a plurality of protrusions that shape the outer contour of the tread surface of the tire, and a plurality of protrusions that extend from the main body portion 50 in the radial direction of the mold and impart a groove shape to the tread surface of the tire. This ridge 51 includes a first ridge 52 and a second ridge 53 extending across the first ridge 52. The die-attached body piece 502P corresponds to a die portion of a minimum die unit corresponding to one pitch of the tread pattern provided on the tread surface of the tire.

In the die-attached body piece 502P in this embodiment, for example, the main body portion 50 is formed by using the ridge portion 51 formed in advance by a laser layered modeling method (powder direct molding method), assembly of a press / welded member, or the like. A groove (discharge slit) 50G (see FIG. 24) is formed by inserting (projecting) the protrusion 51 into the inner peripheral surface of the main body 50 by performing electric discharge machining on the inner peripheral surface. FIG. 21 shows a state where the protrusion 51 is inserted into the groove 50G.

FIG. 22 is a perspective view of the protrusion 51 of the die attachment piece 502P shown in FIG. The protrusion 51 in this embodiment includes at least a part of the first protrusion 52 and at least a part of the second protrusion 53 in at least a mold minimum unit (a mold minimum unit in this embodiment). Are integrally formed. In this embodiment, all the first protrusions 52 and all the second protrusions 53 in the die-attached body piece 502P are integrally formed.

According to this configuration, the mold-attached piece 502P can be formed simply by arranging the protrusion 51 formed integrally in advance on the main body 50, and thus the mold can be easily manufactured. Moreover, since at least a part of the first protrusion 52 and at least a part of the second protrusion 53 are integrally formed, the strength of the mold can be improved. Furthermore, since the protruding portion 51 can be removed and attached collectively from the main body portion 50 of the die-attached body piece 502P, the mold can be easily cleaned.

Further, the first protrusion 52 and the second protrusion 53 in this embodiment also have a flask-like cross-sectional shape having a thick portion on the inner side in the mold radial direction. Thus, in the protrusion 51 having a flask-like cross-sectional shape, the assembly of the intersection of the first protrusion 52 and the second protrusion 53 tends to be complicated, but in this embodiment, Since the protrusion 51 is integrally formed in advance, a complicated assembly operation can be omitted and the mold can be easily manufactured.

FIG. 23A is a cross-sectional view taken along the line OO in FIG. That is, FIG. 23A shows a cross section of the first protrusion 52. As shown in the figure, the first protrusion 52 in this embodiment has an embedded portion 52a embedded in the main body 50 and an exposed portion 52b exposed from the main body 50, and the embedded portion 52a is It is arranged offset from the groove wall of the groove 50G. That is, in this die-attached body piece 502, a ventilation slit S1 is provided between the body portion 50 of the die-attached body piece and the embedded portion 52a of the first protrusion.

FIG. 23B is a cross-sectional view taken along the line PP in FIG. That is, FIG. 23B shows a cross section of the second protrusion 53. As shown in the drawing, the second protrusion 53 in this embodiment has an embedded portion 53a embedded in the main body 50 and an exposed portion 53b exposed from the main body 50, and the embedded portion 53a is It is arranged offset from the groove wall of the groove 50G. That is, in this die-attached body piece 502, a ventilation slit S2 is provided between the body portion 50 of the die-attached body piece and the embedded portion 53a of the second protrusion. The ventilation slits S1 and S2 are preferably 0.005 mm to 0.05 mm.

Furthermore, in the die-attached body piece 50 in this embodiment, as shown in FIG. 23B, the die-attached body piece is formed in the main body portion 50 (in this embodiment, the groove 50G provided on the inner peripheral surface of the main body portion 50). 50 has a vent hole 50H communicating the inner peripheral surface side and the outer peripheral surface side. The vent hole 50H is a hole extending in a cylindrical shape with a circular cross section in this embodiment, and as shown in FIG. 24, a plurality of (in this example, five) grooves 50H are provided. At least one of the ventilation slits S1 and S2 (both in this embodiment) is preferably connected to the ventilation hole 50H, and more preferably both of the ventilation slits S1 and S2 are connected to the ventilation hole 50H.

When at least one of the ventilation slits S1 and S2 is connected to the ventilation hole 50H, when the tire is vulcanized and molded using the mold 500 including the molded body piece 502P, the gap between the molded body piece 502P and the rubber The air intervening in the air can escape from the vent hole 50H to the outside of the die-attached body piece 502P through the slits S1 and S2. Therefore, unlike the conventional case, there is no need to provide a small hole (vent hole) for venting air in the main body part and / or the ridge part of the die-attached body piece. Does not occur. Thus, if the die-attached body piece 502P having the above-described configuration is used, a non-spy tire can be easily manufactured.

In addition, in the main-body part 50 in this embodiment, as shown in FIG. 24, the five ventilation holes 50H are provided at substantially equal intervals on the groove | channel 50G in which the 2nd protrusion part 53 is arrange | positioned. In the metal mold | die of this invention, arrangement | positioning of an air vent can be arbitrarily positioned according to the shape of the tread pattern provided to a tire.

Further, in the die-attached body piece 502 in this embodiment, it is preferable that the embedded portion 52a of the first protrusion 52 and / or the embedded portion 53a of the second protrusion 53 all extend in the same direction.

In general, the contour line of the inner peripheral surface of the body portion of the die-attached body piece is formed by connecting a plurality of arcs in the mold width direction, and the protrusions arranged in the arc shape are in the normal direction of the arc. Since it will be inserted, the protrusion will extend radially from the circumferential center of the mold. That is, the extending direction of the protruding portion with respect to the mold radial direction varies in each protruding portion. When electric discharge machining is performed on the inner peripheral surface of the main body portion of the die-attached body piece using such a ridge portion, the insertion and extraction directions of the ridge portion with respect to the inner peripheral surface of the main body portion are each ridge portion. In particular, in the position where the insertion and withdrawal directions of the ridge and the normal direction of the inner peripheral surface of the main body at the position of the ridge are greatly different, the main body is formed by electric discharge machining. The groove width of the formed groove may become too wide.

Therefore, if all of the embedded

portions

52a and 53a of the first protrusion 52 and / or the second protrusion 53 extend in the same direction, the protrusion is inserted and pulled out in a certain direction during electric discharge machining. By doing so, none of the ridge portions can unnecessarily squeeze the main body portion, so that the groove width of the groove formed in the main body portion by electric discharge machining can be made close to the thickness of the ridge portion. As a result, the precision of the mold can be improved.

From the above circumstances, all of the embedded portion 52a of the first protrusion 52 and / or the embedded portion 53a of the second protrusion 53 extend along the direction in which the protrusion 51 is pulled out from the main body 50. It is preferable.

Further, FIG. 25 is a perspective view of a modified example of the die-attached body piece 502P shown in FIG. 21, and shows a state in which the protrusion 51 ′ is detached from the main body 50 ′. As described above, the protrusion 51 ′ can be inserted and removed integrally from the main body 50 ′. In this protruding part 51 ', the embedded part 52a' of the first protruding part 52 'and / or the embedded part 53a' of the second protruding part 53 '(in this embodiment, the embedded part of the second protruding part 53') 53a ′) is thicker than the thickness of at least part of the first protrusion 52 ′ and / or the second protrusion 53 ′.

According to this configuration, since the protrusion 51 is more stably held with respect to the main body 50, the strength of the mold can be further improved.

Even in this case, a ventilation slit S1 is provided between the main body portion 50 of the die-attached body piece 502P and the embedded portion 52a of the first protrusion 52, and the main body 50 and the second protrusion 52 are provided. By providing the ventilation slit S2 between the embedded portion 53a of the portion 53 and communicating these slits S1 and S2 with the ventilation hole 50H provided in the main body portion 50, a non-spy tire is easily manufactured. be able to.

FIG. 26A to FIG. 26F are cross-sectional views of still another modified example of the protrusion 51. As shown in the figure, the protrusions 51'A to 51'F are connected to the embedded parts 51'Aa to 51'Fa of the protrusions 51'A to 51'F. Auxiliary grooves 51′Ag to 51′Fg extending in the extending direction of F may be provided. In this case, since the volume of the ventilation slits S1 and S2 between the main body 50 'and the protrusions 51'A to 51'F increases, the air can be vented more smoothly during vulcanization molding of the tire. . In the mold for molding a tire according to the present invention, the auxiliary groove and the embedded portion in which the auxiliary groove is formed can be in any form, for example, as follows.

In the example of FIG. 26A, on both side surfaces of the embedded portion 51'Aa of the protruding portion 51'A, in this example, a plurality of narrow grooves extending along the extending direction of the protruding portion 51'A A groove 51'Ag is formed. In this case, the ridge 51′A can be obtained by changing the radial position of the narrow groove provided on one side surface of the embedded portion 51′Aa and the narrow groove provided on the other side surface. The volume of the ventilation slits S1 and S2 between the embedded portion 51′Aa of the ridge portion 51′A and the main body portion 50 ′ can be increased without extremely reducing the strength of the ridge portion 51′A.

In the example of FIG. 26B, the thickness of the embedded portion 51′Ba of the protruding portion 51′B is larger than the thickness of at least a part of the protruding portion 51′B, and such an embedded portion 51 is used. Auxiliary grooves 51 ′ Bg similar to FIG. 26A are formed on both side surfaces of ‘Ba’. In this case, the volume of the ventilation slits S1 and S2 can be increased while improving the strength of the protrusion.

In the example of FIG. 26C, the thickness of the embedded portion 51′Ca of the protruding portion 51′C is larger than the thickness of at least a part of the protruding portion 51′C, and such an embedded portion 51 is provided. On both side surfaces of the 'Ca, one depression having a wide width (in this example, a width of about 1/3 of the length in the mold radial direction of the embedded portion 51'Ca) is formed. More specifically, the recess is formed in the inner portion of the embedded portion 51′Ca in the mold radial direction. In this case, manufacturing is easier than in the case of providing a plurality of narrow slits.

Furthermore, in the example of FIG. 26C, the cross-sectional width of the embedded portion 51 ′ Ca is at least on the outer side in the mold radial direction of the auxiliary groove 51 ′ Cg formed by the dent in the cross-sectional view of the protrusion 51 ′ C. It is larger than the inner side in the mold radial direction. In other words, in the region where the auxiliary groove 51′Cg is formed, the outer width of the embedded portion 51′Ca gradually becomes wider from the inside in the mold radial direction toward the outside.

Usually, when a discharge slit is introduced into the main body, the opening width on the outer side in the mold radial direction of the discharge slit tends to be larger than the opening width on the inner side in the mold radial direction. This is considered to be because the time of exposure to electric discharge machining is longer on the outer side in the mold radial direction of the discharge slit and is eroded by the eluting material (sludge) than on the inner side. Therefore, if the cross-sectional width of the embedded portion 51′Ca is set as described above, a partially excessive gap is generated between the embedded portion 51′Ca and the groove wall of the groove 50′G of the main body portion 50 ′. It becomes easy to avoid.

In the example of FIG. 26D, as in the example shown in FIG. 26C, a wide width formed in each side surface of the embedded portion 51′Da (in this example, the length in the mold radial direction of the embedded portion 51′Da). In addition, a plurality of narrow grooves (two on each side in this example) are formed on the inner side in the mold radial direction of the wide recess. Yes. In this case, the volume of the ventilation slits S1 and S2 between the protrusion 51′D and the main body 50 ′ can be further increased.

In the example of FIG. 26E, as in the example shown in FIG. 26C, a wide width formed in each side surface of the embedded portion 51′Ea (in this example, the length in the mold radial direction of the embedded portion 51′Ea). And the cross-sectional width of the embedded portion 51'Ea always increases gradually from the inner side to the outer side in the mold radial direction of the embedded portion 51'Ea. ing. That is, the outline shape of the cross section of the embedded portion 51′Ea is a trapezoidal shape. In this case, it becomes easier to avoid a partially excessive gap between the embedded portion 51′Ea and the groove wall of the groove 50′G of the main body portion 50 ′.

Further, in the example of FIG. 26F, as in the example shown in FIG. 26E, a wide width formed in each side surface of the embedded portion 51′Fa (in this example, the length in the mold radial direction of the embedded portion 51′Fa). In addition, a plurality of narrow slits (in this example, two slits on one side) are formed. In this case, the volume of the ventilation slits S1 and S2 between the protrusion 51′F and the main body 50 ′ can be increased.

Further, in this die-attached body piece 502P, both the main body portion 50 and the protrusion portion 51 are fixed in the holder 101 shown in FIG. 1 so as to be fastened to each other using, for example, an arch bridge effect. . In this case, since the main body 50 and the protrusion 51 can be removed at the same time by removing the die-attached body piece 502P from the holder 101, cleaning between the main body 50 and the protrusion 51 (removal of clogging substances) is performed. It can be done easily. Of course, assembly after cleaning can be easily performed. However, the main body portion and the ridge portion may be fixed by a horizontal skewering method in accordance with the configuration of the tread mold attachment.

<Tire mold 6>
FIG. 27 is a perspective view showing a die-attached body piece 602P in a tire molding die 600 as another embodiment of the present invention. In this die-attached piece 602P, the description of the same configuration as that of the die-attached pieces 102P to 502P described above is omitted.

The die-attached body piece 602P is formed with a plurality of protrusions that shape the outer contour of the tread surface of the tire, and a groove shape that extends in the mold radial direction from the main body portion 60 and imparts a groove shape to the tread surface of the tire. The ridge portion 61 includes a first ridge portion 62 and a second ridge portion 63 extending so as to intersect with the first ridge portion 62. The mold attachment piece 602P is different in configuration from the mold attachment piece 502P described above in that it corresponds to two pitches of the tread pattern applied to the tread surface of the tire.

In this embodiment, the first ridge portion 62 and the second ridge portion 63 that form a tread pattern for two pitches are integrally formed. As shown in the perspective view of the ridge portion 61 in this embodiment in FIG. 27, the ridge portion 61 can be detached from the main body portion 60 and attached. Thus, if the protrusions corresponding to two or more pitches of the tread pattern are integrally formed, the configuration of the mold becomes simpler and the assembly of the mold becomes easier.

FIG. 28 is a plan view of the main body 60 of the die-attached body piece 602P shown in FIG. When the protrusions corresponding to two pitches or more of the tread pattern are integrally formed, the air vent hole provided in the main body portion 60 of the die-attached piece 602P is the first in the plan view of the die-attached piece 602P. It is preferable that at least one be disposed in a closed space surrounded by the protrusion and the second protrusion. For example, as shown in FIG. 28, the vent hole 60H is preferably provided at the groove bottom of the groove 60G in which the protrusion 61 is disposed, and in particular, each section surrounded by the groove 60G (in this embodiment, Preferably, the sections D1 to D5) are all provided with a vent hole 60H.

<Tire mold 7>
FIG. 29 is a perspective view showing a die-attached body piece 702P in a tire molding die 700 as another embodiment of the present invention. In this die-attached piece 702P, the description of the same configuration as the die-attached pieces 102P to 602P described above is omitted.

The die-attached body piece 702P is formed with a plurality of protrusions that shape the outer contour of the tread surface of the tire and that extend from the main body portion 70 in the radial direction of the mold to form a groove shape on the tread surface of the tire. The ridge portion 71 includes a first ridge portion 72 and a second ridge portion 73 extending so as to intersect with the first ridge portion 72. This mold attachment piece 702P has the same configuration as the mold attachment piece 602P described above in that it corresponds to two pitches of the tread pattern applied to the tread surface of the tire. The configuration differs from the above-mentioned die-attached body piece 602P in that the second protrusions 73 adjacent in the mold circumferential direction are connected to each other by the connecting member 74.

FIG. 29 is a perspective view of the protrusion 71 of the die-attached body piece 702P shown in FIG. In this protrusion 71, the embedded part 72a of the first protrusion 72 and / or the embedded part 73a of the second protrusion 73 adjacent to the circumferential direction of the mold (in the present embodiment, the second protrusion 73). Embedded portion 73 a) are connected to each other by one or two connecting members 74. Since only the embedded portion 73 a is connected, the connecting member 74 is embedded in the main body portion 70 when the main body portion 70 and the protrusion portion 71 are assembled. Specifically, the connecting member 74 is provided such that the inner surface in the mold radial direction of the connecting member 74 is located on the same plane as the inner peripheral surface of the main body 70.

Thus, since the connection of the protrusion part 71 will become still stronger if the protrusion part 71 (this embodiment 2nd protrusion part 73) adjacent in the metal mold | die circumferential direction is connected, a metal mold | die will be obtained. The strength of can be further improved.

In addition, as shown in the plan view of the main body portion 70 of the die-attached body piece 702P in FIG. 30, even when the connecting member 74 is provided, the vent hole provided in the main body portion 70 is a groove in which the ridge portion 71 is disposed. 70G is preferably provided at the bottom of the groove, and in particular, each of the sections surrounded by the groove 70G (in this embodiment, sections D1 to D10) is preferably provided with a vent hole 70H.

In the groove in which the connecting member 74 is disposed, it is preferable that the connecting member 74 is disposed offset from the groove wall, that is, a communication slit is provided between the connecting member 74 and the groove wall. In this case, the air intervening between the mold surface and the tire can be more efficiently exhausted during the vulcanization molding of the tire.

Further, in the above-mentioned die-attached

body pieces

502P, 602P, and 702P, on the tread surface of the tire, a protrusion (hereinafter referred to as a “separating protrusion” for forming a groove and / or sipe that terminates in the land portion of the tread. If the connecting member is used, the separating protrusion can also be formed integrally with another protrusion.

Furthermore, in the above-mentioned die-attached

body pieces

502P, 602P, and 702P, the recessed portion extending in the extending direction of the protruding portion is provided in the embedded portion of the protruding portion, whereby the embedded portion of the protruding portion and the main body It is also possible to provide a slit provided between the groove wall of the part. In this case, the protrusion can be more stably fixed to the main body.

<Method 2 for manufacturing mold for tire molding>
Next, a method for manufacturing the above-described

tire molding molds

500, 600, and 700 will be described. Here, the above-described mold 500 will be described as an example.
In the mold manufacturing method in this embodiment, when the mold portion corresponding to one pitch of the tread pattern applied to the tread surface of the tire is defined as the minimum mold unit, the first mold unit is at least in the minimum mold unit. A ridge portion forming step for integrally forming at least a portion of the ridge portion 52 and at least a portion of the second ridge portion 53, and a ridge formed integrally with the main body portion 50 of the die-attached body piece 502P. A groove forming step for forming the groove 50G for installing the portion 51 and a ridge portion installing step for inserting the integrally formed ridge portion 51 into the groove 50G are included in this order.

In this metal mold manufacturing method, since the protrusions 51 are integrally formed in advance, the metal mold can be easily assembled even in a metal mold for providing a complicated tread pattern. Further, according to this configuration, a tire molding die with improved strength can be easily obtained.

In particular, a tread pattern in which a first groove having a larger groove width on the groove bottom side than the tread tread side intersects a second groove having a groove width on the groove bottom side that is also larger than the tread tread side is formed on the tread tread of the tire. In the die-attached body piece for providing, the first protrusion 52 for forming the first groove, and the second protrusion 53 for forming the second groove, As described above, it takes time to process the intersection. A mold for providing such a tread pattern can be manufactured with high accuracy and ease.

Further, in this mold manufacturing method, the portions of the first protrusion 52 and the second protrusion 53 that are to be embedded in the main body portion 50 of the tread mold attachment 502P are embedded

portions

52a and 53a. When the exposed portions 52b and 53b are exposed portions from the main body portion 50, the first protrusion 52 and the second protrusion in the above-described protrusion forming step in the sectional view of the tire molding die. It is preferable that all the embedded

portions

52a and 53a of the portion 53 are formed to extend in the same direction.

According to this configuration, when performing electrical discharge machining on the main body 50 using the protrusion 51, the groove width of the groove formed by the protrusion 51 is approximated to the width of the embedded portion of the protrusion 51. Therefore, the precision of the mold can be further improved.

Further, in this mold manufacturing method, as in the above-described modification of the mold 500, in the protrusion forming process, the first protrusion 52 and / or the second protrusion 53 is embedded. It is preferable that the thickness of 52a, 53a is made thicker than the thickness of at least a part of the first protrusion 52 and / or the second protrusion 53. According to this manufacturing method, a mold having further improved strength can be obtained.

Further, in this mold manufacturing method, as in the above-described mold 700, the first protrusion 72 and / or the second protrusion 73 are moved in the first protrusion in the protrusion forming process. It is preferable to connect by the connection member 74 provided between the embedding part 72a of the stripe part 72 and / or the embedding part 73a of this 2nd protrusion 73 part. According to this configuration, a mold having further improved strength can be obtained.

Further, in this mold manufacturing method, in the groove forming step, the groove 50G formed in the main body portion 50 of the die-attached body piece 502P is integrally formed as in the above-described

molds

500, 600, and 700. A vent hole 50H is formed which is wider than the thickness of the embedded portion of the protruding ridge 51 and which communicates the inner peripheral surface side and the outer peripheral surface side of the die-attached body piece 502P at the groove bottom of the groove 50G. It is preferable to do. According to this configuration, a non-spy tire can be easily obtained.

Furthermore, tires manufactured using the above-described

tire molding molds

500, 600, and 700 can be manufactured simply by assembling the parts forming the first and second protrusions of the die-attachment piece. Since the

molds

500, 600, and 700 are manufactured, even if they have a complicated tread pattern, they can be easily manufactured.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

<Test 1>
Inventive examples and comparative molds for tire molding were prototyped under the following specifications, and the ease of manufacturing a mold capable of obtaining a non-spy tire and the durability of the mold were evaluated.

In the tire molding die 1-1 of the invention example, the concave portion extending in the radial direction of the mold is formed on the side surface of the first ridge portion, and the concave portion is formed at the end portion of the second ridge portion. A die attachment body shown in FIG. 7 manufactured by a direct engraving method, including a connection portion forming step for forming a connection portion having a shape to be fitted into the recess, and a fitting step for fitting the connection portion into the recess. A mold provided with a piece. In this mold, the first ridge and the second ridge, which are directly shaped as a single piece, are fitted together. The first and second ridges are fixed to the main body by pinning and microwelding to the gap between the first and second ridges.
This mold is a sectional mold type comprising a holder and a tread mold attachment divided into nine in the mold circumferential direction.
The tread mold attachment of this mold has an inner diameter of about 1060 mm, a mold radial height: 350 mm, and a thickness of 40 mm.
The dimension of the 1st protrusion part of this metal mold | die is base part thickness: 0.7mm, front-end | tip part diameter: about (phi) 5mm, and mold radial direction height: 15mm.
The dimension of the 2nd protrusion part of this metal mold | die is base part thickness: 0.6mm, front-end | tip part diameter: about (phi) 3mm, and mold radial direction height: 12mm.

In the tire molding die 1-2 of the invention example, the concave portion extending in the radial direction of the mold is formed on the side surface of the first protruding portion, and the concave portion is formed at the end of the second protruding portion. It is the metal mold | die shown in FIG. 12 manufactured by the casting manufacturing method which fits a connection part in the connection part formation process and recessed part which forms the connection part which has a shape fitted in. In this mold, as shown in FIG. 16, the first ridge part that is divided and shaped as an assembly consisting of eight parts and the second ridge part that is directly shaped as a single piece are fitted together. Yes. The first protrusion and the second protrusion are cast and fixed to the main body by an aluminum alloy of the main body.
In addition, the division structure of this mold, and the dimensions of the tread mold attachment, the first protrusion, and the first protrusion are the same as those of the tire molding mold 1-1 of the above-described invention example.

In the tire molding die 1-3 of the invention example, a concave portion extending in the radial direction of the mold is formed on the side surface of the first protruding portion, and the concave portion is formed at the end of the second protruding portion. A die attachment body shown in FIG. 7 manufactured by a direct engraving method, including a connection portion forming step for forming a connection portion having a shape to be fitted into the recess, and a fitting step for fitting the connection portion into the recess. A mold provided with a piece. In this mold, as shown in FIG. 11, the first ridge part that is divided and shaped as an assembly composed of eight parts and the second ridge part that is directly shaped as a single piece are fitted together. Yes. Further, a protrusion extending in a direction intersecting with the radial direction of the mold is provided at the end of the second protrusion (see FIG. 10), and the protrusion of the first protrusion corresponds to the protrusion. A protrusion receiver is provided. The first protrusion and the second protrusion are fixed to the main body by pinning and fastening the washer in the circumferential direction of the first protrusion at the end of the die-attached body piece.
In addition, the division structure of this mold, and the dimensions of the tread mold attachment, the first protrusion, and the first protrusion are the same as those of the tire molding mold 1-1 of the above-described invention example.

The mold for tire molding of the comparative example is a main body portion obtained by casting a first ridge portion that is divided and shaped as an assembly of eight parts and a second ridge portion that is directly shaped as a single piece. It is the metal mold | die manufactured by the method of casting in. A recess extending in the mold radial direction is not provided on the side surface of the first ridge portion, and the end of the second ridge portion is attached to the side surface of the first ridge portion. The main body is cast with an aluminum alloy.
In addition, the division structure of this mold, and the dimensions of the tread mold attachment, the first protrusion, and the first protrusion are the same as those of the tire molding mold 1-1 of the above-described invention example.

(Manufacturability)
The time required for manufacturing the tire molding die 1-1 to 1-3 of the example and the tire molding die of the comparative example, the time required for cleaning and partial repair after repeated use of the die (sand biting) The degree of manufacturability was evaluated based on, for example, correction of permanent deformation of the protrusion. Table 1 shows the ranking of the ease. The higher ranking (the smaller the numerical value) indicates that the manufacturing is easier.

(durability)
Test tires were actually manufactured using the tire molding molds 1-1 to 1-3 of the example and the tire molding mold of the comparative example, and the mold after 3000 cycles (3,000 tires were manufactured) The durability of the mold was evaluated with this state.

As described above, in the tire molding mold of the comparative example, the mold was confirmed to be damaged after 700 cycles. However, in the tire molding molds 1-1 to 1-3 of the present invention, the mold was molded even after 3000 cycles. The mold was not damaged. That is, it was found that the durability of the tire molding dies 1-1 to 1-3 of the present invention was greatly improved as compared with the tire molding dies of the comparative example. In addition, it was found that the tire molding die 1-3 is excellent in the balance between the manufacturability and durability of the die.

<Test 2>
Inventive examples and comparative molds for tire molding were prototyped under the following specifications, and the ease of manufacturing a mold capable of obtaining a non-spy tire and the durability of the mold were evaluated.

The tire molding die 2-1 of the invention example is a ridge part that integrally forms at least a part of the first ridge part and at least a part of the second ridge part at least in the minimum unit of the mold. Forming a groove for installing the integrally formed protrusion on the main body of the die-attached body piece; inserting the integrally formed protrusion into the groove; It is a metal mold | die provided with the die attachment body piece shown in FIG. 26 including a strip | line part installation process in this order.
More specifically, the first protrusion and the second protrusion are integrally formed to form a protrusion, and extend about 10 mm from the exposed portion of the protrusion (design imparting portion on the tread surface of the tire). Using the embedded portion thus formed as an electrode, slits are introduced into the inner peripheral surface of the main body portion of the die-attached body piece by electric discharge machining, and then the ridge portion is disposed (planted) in the main body portion, and the ridge portion and The main body part was fixed by fixing a horizontal skewer (5 φ4 mm steel pins) to complete the mold.
In addition, the gap (0.2 to 0.5 mm) between the embedded portion of the ridge and the main body generated by electric discharge machining is caused by overlay welding of the common material to the main body and engraving. It was refilled and the shape was corrected to the desired slit width.
The dimensions of the tread mold attachment of this mold are an inner diameter of about 1060 mm, a mold radial height: 350 mm, and a thickness of 30 mm.
In the tread mold attachment, the number of repetitions of the basic pattern in the mold circumferential direction is 63.
The dimensions of the first protrusions of this mold are a base thickness: 4 mm, a tip diameter: approximately φ12 mm, and a mold radial height of 16 mm.
The dimensions of the second protrusion of the mold are as follows: base thickness: 0.6 mm, tip diameter: approximately φ2 mm, and mold radial height of 14 mm.
Further, the main body portion of the die-attached body piece is manufactured by AC7A alloy (Al-5% Mg alloy) casting, and then the inner peripheral side and the several sides of the material are turned and further divided by wire electric discharge machining. Was obtained.
Moreover, the protrusion part of the die-attached body piece was obtained by dividing a back surface and both side surface parts by wire electric discharge machining after manufacturing a material by a laser additive manufacturing method (powder direct modeling). The powder material is 18% Ni maraging steel.

The tire molding die 2-2 of the invention example is formed by extending all the embedded portions of the protrusions in the same direction in a cross-sectional view in the width direction of the mold, and using the embedded portions as electrodes. The die is the same as the tire molding die 1 of the above invention example, except that slits are introduced into the inner peripheral surface of the main body portion of the die-attachment piece by electric discharge machining. Specifically, the edge of the burying portion of the ridge is extruded 10 mm from the approximate center of gravity of the ridge, and the burying portion of the ridge is inclined in a certain direction with respect to the exposed portion. Except for the above, it is the same mold as the tire molding mold 2-1 of the above-described invention example.
In addition, since the gap between the embedded portion of the protruding portion and the main body portion of the die-attached piece produced by electric discharge machining was about 0.02 mm to 0.03 mm, the slit was corrected. There was no need to do it.

In the tire molding die 2-3 of the invention example, the inner peripheral surface side and the outer peripheral surface side of the die-attached body piece communicate with the groove bottom of the groove provided in the main body portion of the die-attached piece by electric discharge machining. The mold is the same as the tire molding mold 2-2 of the invention example except that a vent hole is formed.

The tire molding die 2-4 of the invention example is the tire of the invention example except that the thickness of the embedded portion of the second ridge portion is thicker than the thickness of at least a part of the second ridge portion. This is the same mold as the molding mold 2-3. In the tire molding molds 2-1 to 2-3 of the invention example, the thickness of the embedded portion and the exposed portion of the second protrusion is 0.6 mm as described above. In the molding die 2-4, the thickness of the embedded portion of the second protrusion was 1.2 mm.

The tire molding die 2-5 of the invention example is the same as the tire molding die 2-4 of the invention example, except for the method of fixing the protrusion to the main body. That is, the protrusion is fixed to the main body by a washer method. More specifically, the ridges are held down at four locations on each end of the die-attached body piece using a washer (diameter approximately φ30 mm) and a fixing bolt M10. Therefore, a horizontal skewer for fixing the protrusion and the main body is not used.

The tire molding die 2-1 of the comparative example is the same as the tire molding die 2-1 of the invention example, except that it was manufactured by the conventional direct engraving method. The same mold as the mold 2-1. However, as shown in Table 2 below, it is extremely difficult to manufacture the same mold as the tire molding mold 2-1 of the invention example by the conventional direct engraving method, and the tire molding mold of the comparative example Mold 2-1 was not completed.

The tire molding die 2-2 of the comparative example is the same as the tire molding die 2-1 of the invention example, except that it was manufactured by a conventional casting method. The same mold as 2-1.

(Manufacturability)
The time required for manufacturing the tire molding molds 2-1 to 2-5 of the example and the tire molding mold of the comparative example, the time required for cleaning and partial repair after repeated use of the mold (sand biting) In addition, the degree of ease of manufacturing a mold capable of obtaining a non-spoo tire was evaluated based on the correction of permanent deformation of the protrusions and the like.

From the above, it was found that the mold for molding a tire according to the present invention is easier to manufacture and has a significantly improved durability as compared with the mold for molding a tire of the comparative example. Furthermore, according to the tire molding dies 2-3 to 2-5 of the present invention, a non-spy tire can be obtained.

10, 20, 30, 40, 50, 60, 70: the main body of the molded body piece,
11, 21, 31, 41, 51, 61, 71: ridges of the body-attached piece,
12, 22, 32, 42, 52, 62, 72: the first protrusion,
12R, 22R, 32R, 42R, 52R, 62R, 72R: recesses 13, 23, 33, 43, 53, 63, 73: second protrusions,
13C, 23C, 33C, 43C, 53C, 63C, 73C: connection part,
50S, 60S, 70S: groove,
50H, 60H, 70H: vents,
52a, 62a, 72a: embedded portion of the first protrusion
52b, 62b, 72b: exposed portions of the first protrusions,
53a, 63a, 73a: embedded portion of the second protrusion
53b, 63b, 73b: exposed portions of the second protrusions,
100, 200, 300, 400, 500, 600, 700: tire molding mold,
101, 201, 301, 401, 501, 601, 701: Tread-type body,
102P, 202P, 302P, 402P, 502P, 602P, 702P: Molded body piece,
900: Conventional mold for tire molding,
P: protrusion,
S1, S2: Ventilation slit

Claims

It comprises a tread mold attachment that molds the tread surface of the tire, consisting of a plurality of mold attachment pieces arranged in the circumferential direction of the tire molding die,
The die-attachment piece molds the outer contour of the tread surface of the tire, and extends from the main body portion in the radial direction of the tire molding die to give a groove shape to the tread surface of the tire. A plurality of protrusions, and
The plurality of protrusions are tire molding molds including a first protrusion and a second protrusion extending across the first protrusion,
The first protrusion is provided with a recess extending in a radial direction of the tire molding die on a side surface of the first protrusion.
The second ridge portion includes a connection portion having a shape that fits into the concave portion at an end portion of the second ridge portion,
A tire molding die, wherein the connection portion is fitted into the recess.
A protrusion extending in a direction intersecting with a radial direction of the tire molding die is formed on the connection portion of the second protrusion, and the protrusion is formed on the recess of the first protrusion. The tire molding die according to claim 1, wherein a corresponding projection receiver is formed.
A tread mold attachment comprising a plurality of mold attachment pieces arranged in the circumferential direction of a tire molding die, and for shaping the tread surface of the tire,
The die-attachment piece molds the outer contour of the tread surface of the tire, and extends from the main body portion in the radial direction of the tire molding die to give a groove shape to the tread surface of the tire. A plurality of protrusions, and
The plurality of protrusions includes a first protrusion and a second protrusion extending across the first protrusion, and a tire forming mold for obtaining a tire forming mold. A mold manufacturing method,
Forming a recess extending in the radial direction of the tire molding die on a side surface of the first protrusion, and a recess forming step;
A connecting portion forming step of forming a connecting portion having a shape that fits into the concave portion at an end of the second protruding portion;
And a fitting step of fitting the connecting portion into the concave portion.
Prior to the fitting step,
Providing a protrusion extending in a direction intersecting with a radial direction of the tire molding die at an end of the second protrusion,
The tire molding die according to claim 3, further comprising: a protrusion receiving step of providing a protrusion receiver corresponding to the protrusion in the concave portion of the first protrusion.
A tire manufactured using the tire molding die according to claim 1 or 2.
It comprises a tread mold attachment that molds the tread surface of the tire, consisting of a plurality of mold attachment pieces arranged in the circumferential direction of the tire molding die,
The die-attachment piece molds the outer contour of the tread surface of the tire, and extends from the main body portion in the radial direction of the tire molding die to give a groove shape to the tread surface of the tire. A plurality of protrusions, and
The plurality of protrusions are tire molding molds including a first protrusion and a second protrusion extending across the first protrusion,
When the mold portion corresponding to one pitch of the tread pattern provided on the tread surface of the tire is a minimum mold unit,
At least a part of the first protrusion and at least a part of the second protrusion at least in the minimum unit of the mold are integrally formed.
The first ridge and the second ridge have an embedded part embedded in a main body part of the tread-type attachment, and an exposed part exposed from the main body part,
The tire molding die according to claim 6, wherein all of the embedded portions extend in the same direction in a cross-sectional view in the width direction of the tire molding die.
The thickness of the embedded portion of the first ridge and / or the second ridge is greater than the thickness of at least a part of the first ridge and / or the second ridge. Item 8. A mold for molding a tire according to Item 6 or 7.
The embedment portion of the first ridge portion and / or the burying portion of the second ridge portion, which are adjacent to each other in the circumferential direction of the tire molding die, are connected by a connecting member. The mold for tire molding according to any one of 8.
The main body portion of the die body piece has a vent hole that communicates the inner peripheral surface side and the outer peripheral surface side of the die body piece, and the main body portion of the die body piece and the first protrusion A ventilation slit between the portion and / or the buried portion of the second protrusion,
The mold for molding a tire according to any one of claims 6 to 9, wherein the ventilation slit is connected to the ventilation hole.
It comprises a tread mold attachment that molds the tread surface of the tire, consisting of a plurality of mold attachment pieces arranged in the circumferential direction of the tire molding die,
The die-attachment piece molds the outer contour of the tread surface of the tire, and extends from the main body portion in the radial direction of the tire molding die to give a groove shape to the tread surface of the tire. A plurality of protrusions, and
The plurality of protrusions includes a first protrusion and a second protrusion extending across the first protrusion, and a tire forming mold for obtaining a tire forming mold. A mold manufacturing method,
When the mold portion corresponding to one pitch of the tread pattern provided on the tread surface of the tire is a minimum mold unit,
At least a part of the first protrusion and at least a part of the second protrusion at least in the mold minimum unit, and a protrusion forming step;
Forming a groove for installing the integrally formed protrusion on the main body of the die-attached body piece; and a groove forming step;
Inserting the integrally formed protrusion into the groove, a protrusion installation step,
In this order, a method for manufacturing a mold for molding a tire.
A portion of the first ridge portion and the second ridge portion that is to be embedded in the main body portion of the tread-type attachment is an embedded portion, and a portion that is exposed from the main body portion is an exposed portion. When
In the protrusion forming step,
12. The tire according to claim 11, wherein all of the embedded portions of the first protrusions and the second protrusions extend in the same direction in a cross-sectional view in the width direction of the tire molding die. Manufacturing method of mold for molding.
In the protrusion forming step,
The thickness of the embedded portion of the first ridge and / or the second ridge is made thicker than the thickness of at least a part of the first ridge and / or the second ridge, The manufacturing method of the metal mold | die for tire shaping | molding of Claim 12.
In the protrusion forming step,
The first ridge and / or the second ridge is connected by a connecting member provided between the embedded portion of the first ridge and / or the embedded portion of the second ridge. The manufacturing method of the metal mold | die for tire shaping | molding of Claim 12 or 13.
In the groove forming step,
Forming a groove formed in the body portion of the die-attached body piece to be wider than the thickness of the embedded portion of the integrally formed protrusion, and
The tire molding die according to any one of claims 12 to 14, wherein a vent hole communicating the inner peripheral surface side and the outer peripheral surface side of the die-attached body piece is formed in the groove bottom of the groove. Production method.
A tire manufactured using the tire molding die according to any one of claims 6 to 10.