JP7768754B2 - Method for manufacturing a mold for tire manufacturing - Google Patents

Description

An embodiment of the present invention relates to a method for manufacturing a tire manufacturing mold.

Molds for manufacturing tire tread surfaces are generally made by pouring metal into a plaster mold and casting. Furthermore, in molds for manufacturing tires with voids such as sipes in the tread surface, the void molding material used to mold the voids may be made from a different material than the mold body. For example, the mold body may be made from a soft metal such as aluminum for lightness, while the void molding material is made from an iron-based metal such as stainless steel for strength. In such cases, the void molding material is cast into the mold body when the mold body is cast.

The following method is known for producing a mold with such a void molding material. The void molding material is attached to a rubber mold, and plaster is poured into the rubber mold to produce a plaster mold with the void molding material fixed in place. The rubber mold is then removed, and the mold body is cast by pouring metal into the plaster mold. The plaster mold is then removed, yielding a mold with the void molding material cast in place (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 10-58458

When attaching the void molding material to a rubber mold to create a plaster mold as described above, it is difficult to maintain a stable position of the metal void molding material relative to the rubber mold. If the void molding material's position is not stable within the rubber mold, the positioning accuracy of the void molding material in the plaster mold is compromised, which in turn affects the positioning accuracy of the void molding material in the tire manufacturing mold. In recent years, in order to improve tire performance, it has become common to use narrow and deep groove shapes on the tread surface that are wider than sipes. When molding such grooves with void molding material, the weight of the void molding material makes it even more difficult for it to maintain a stable position in the rubber mold compared to when molding sipes, and the positioning accuracy of the void molding material in the plaster mold is compromised.

In view of the above, an embodiment of the present invention aims to provide a method for manufacturing a tire manufacturing mold that has excellent positioning accuracy for void molding material.

An embodiment of the present invention is a method for manufacturing a tire manufacturing mold that includes a mold body for molding the tread surface and a void molding material made of a different material from the mold body for molding voids in the tread surface. The manufacturing method includes attaching the void molding material to a rubber mold together with a support member while the void molding material is supported by the support member; pouring plaster into the rubber mold while the void molding material is supported to create a plaster mold in which the void molding material is fixed; and pouring metal into the plaster mold to cast the mold body with the void molding material cast inside.

In one embodiment, the support member may be attached to the rubber mold in a state where it protrudes from the molding surface of the rubber mold, and the plaster mold may be prepared with the protruding portion embedded. After the mold body is cast, the portion of the support member protruding from the tread molding surface of the mold body may be removed. In this case, the support member may have a breaking portion for removing the portion, and after the mold body is cast, the support member may be broken using the breaking portion to remove the portion.

In one embodiment, the support member may be attached to the rubber mold without protruding from the molding surface of the rubber mold. In this case, the support member may support the void molding material in a range of 70 to 95% of the depth from the deepest part of the portion of the void molding material embedded in the rubber mold.

In one embodiment, the support member may be made of the same material as the mold body.

In one embodiment, multiple void molding materials may be provided in the mold body, and each void molding material may be supported by multiple support members.

In one embodiment, the support member may be shaped so that it is connected across both sides of the width of the portion of the void molding material embedded in the rubber mold, spanning the deepest part.

In an embodiment of the present invention, a plaster mold is created by pouring plaster into a rubber mold while the void molding material is supported on the rubber mold using a support member, which stabilizes the position of the void molding material in the rubber mold and improves the positioning accuracy of the void molding material in the plaster mold.

Half cross-section of a tire vulcanizing machine Schematic diagram for explaining a manufacturing process of a tire manufacturing mold according to one embodiment. 1 is a perspective view of a master mold according to a first embodiment; 1 is a perspective view showing a process for manufacturing a rubber mold according to a first embodiment; 1 is a perspective view of a rubber mold according to a first embodiment; 1 is a perspective view showing a process for producing a plaster mold in the first embodiment; 1 is a perspective view of a gypsum mold according to a first embodiment; FIG. 10 is a perspective view showing a casting process of the die body in the first embodiment; FIG. 10 is a perspective view showing a step of removing the tire building mold in the first embodiment. 1A and 1B are cross-sectional views of the void molding material and its surroundings in each manufacturing process of a tire manufacturing mold according to the first embodiment; FIG. 1 is an enlarged perspective view of a main part of a gypsum mold according to a first embodiment; 10A and 10B are cross-sectional views of the void molding material and its surroundings in each manufacturing process of a tire manufacturing mold according to a second embodiment. FIG. 10 is an enlarged perspective view of a main part of a gypsum mold according to a second embodiment. FIG. 10 is an enlarged perspective view of a main part of a gypsum mold according to a third embodiment.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows an example of a tire vulcanization apparatus 10 for vulcanizing and molding pneumatic tires. The tire vulcanization apparatus 10 includes a vulcanization mold 12, a container 14 to which the vulcanization mold 12 is attached, and a bladder 16, and vulcanizes an unvulcanized tire while molding it into a predetermined shape.

The vulcanization mold 12 comprises a pair of upper and lower side plates 18, 20, multiple sectors 22 divided circumferentially, and a pair of upper and lower bead rings 24, 26, and is used to mold the outer surface of the tire T. The sectors 22 are molds used to mold the tread surface T1 of the tire T, and are divided into multiple sectors circumferentially and are provided so that they can expand and contract radially.

The container 14 comprises a plurality of segments 28 that hold the sectors 22, a jacket ring 30 that moves the segments 28 in the tire radial direction, and a pair of upper and lower mounting plates 32, 34. The jacket ring 30 moves up and down relative to the segments 28, thereby moving the segments 28 in the tire radial direction, thereby allowing the sectors 22 to expand and contract in the tire radial direction. The upper mounting plate 32 is configured to move up and down relative to the lower mounting plate 34 by a lifting device (not shown).

The bladder 16 is made of a toroidal, expandable, and elastic rubber body. It is placed on the inner surface of the tire T and inflates when pressurized gas is supplied, thereby pressurizing the tire T from the inside.

The following describes a method for manufacturing the sector 22, which is a mold for molding the tread surface T1 (i.e., the decorative surface of the tread) of the tire T. The side plates 18, 20 and bead rings 24, 24, which are molds other than the sector 22, can be manufactured using conventional methods. In the following description, the sector 22 will be referred to as the "tire manufacturing mold 22" or simply as the "mold 22."

The mold 22 comprises a mold body 40 for molding the tread surface T1 and a void molding material 42 for molding voids in the tread surface T1 (see Figure 9). Typically, multiple void molding materials 42 are cast-into the mold body 40. Cast-in generally refers to pouring molten metal around a different material to obtain a cast product integrated with the main body. In this case, it refers to pouring molten metal into the void molding material 42 as an insert to obtain a mold 22 in which the void molding material 42 is integrated into the mold body 40.

The mold body 40 is made of a soft metal such as aluminum or an aluminum alloy. The mold body 40 has a tread molding surface 40A for molding the tread surface T1. The tread molding surface 40A is provided with ribs 44 for molding main grooves, i.e., circumferential grooves (reference symbol T2 in Figure 1), on the tread surface T1. The ribs 44 are convex ridges that protrude from the tread molding surface 40A and extend in the tire circumferential direction, and are formed integrally with the mold body 40.

The void molding material 42 is made of a different material from the mold body 40, and is preferably made of an iron-based metal such as stainless steel from the standpoint of strength, etc. Examples of voids molded with the void molding material 42 include various recesses formed on the tread surface T1, but preferably include groove-shaped recesses such as sipes and narrow grooves. Here, a sipe is a cut with a groove width of 2 mm or less and is also called a kerf. A narrow groove is a groove narrower than a main groove, for example, a groove with a groove width of 5 mm or less. The sipes and narrow grooves may extend in the tire circumferential direction or the tire width direction. The portion of the void molding material 42 that protrudes from the mold body 40 and molds the voids is called the molding portion 42A, and the portion embedded in the mold body 40 is called the embedded portion 42B.

When molding a groove-shaped depression, the void molding material 42 is plate-shaped. In the example shown in Figure 9, the void molding material 42 is plate-shaped, but the shape of the void molding material 42 is not limited to a flat plate. For example, if the depression to be molded is a curved line in a planar view (opening shape), the void molding material 42 may be a curved plate-shaped. If the depression to be molded is a line with a bend in a planar view, the void molding material 42 may be a plate-shaped with a bend. If the depression to be molded is wavy in a planar view, the void molding material 42 may be a corrugated plate-shaped.

FIG. 2 shows an outline of a method for manufacturing the mold 22, which includes the following steps.
Step 1. Fabrication of master mold 46 (see FIG. 2(A))
Step 2: Attaching the mounting hole molding material 48 to the master mold 46 (see FIG. 2(B))
Step 3. Preparation of rubber mold 50 (see FIGS. 2(C) and (D))
Step 4: Attaching the void molding material 42 to the rubber mold 50 (see FIG. 2(E))
Step 5. Preparation of plaster mold 52 (see FIG. 2(F))
Step 6: Casting the mold 22 (see Figures 2(G) to (I)).

In step 1 shown in Figure 2(A), a master mold 46 is created. The master mold 46 is a mold (tire model) that has the same shape as the tread molded by the mold 22, and has a molding surface 46A (the surface of the master mold 46 for molding the rubber mold 50) that corresponds to the tread surface T1. The master mold 46 can be created by cutting the tread design out of, for example, engineered wood or plaster.

In step 2, as shown in Figure 2(B), a mounting hole molding material 48 is attached to the master mold 46. The mounting hole molding material 48 is a component that molds mounting holes 54 (Figure 2(E)) for attaching the void molding material 42 to the rubber mold 50.

Figure 3 is a perspective view showing the master mold 46 with the mounting hole molding material 48 attached. In Figure 3, the unevenness of the molding surface 46A and the mounting hole molding material 48 are shown in solid lines so that the molding surface 46A and the mounting hole molding material 48 on the underside can be seen through, and the mounting surface of the mounting hole molding material 48 relative to the master mold 46 is shown in dashed lines (the same applies to Figure 4).

In this example, the mounting hole molding material 48 is attached to the molding surface 46A of the master mold 46 using adhesive or the like. The mounting hole molding material 48 may also be attached by forming a groove in the molding surface 46A and embedding a portion of the mounting hole molding material 48 in the groove. The portion of the mounting hole molding material 48 that protrudes from the molding surface 46A has a shape that corresponds to the embedded portion 42B of the void molding material 42.

In step 3, as shown in FIG. 2(C), a rubber material such as silicone rubber is poured into the master mold 46 with the mounting hole molding material 48 attached, covering and filling the molding surface 46A with the rubber material to produce the rubber mold 50. Specifically, as shown in FIG. 4, the master mold 46 is placed in a mold 56 for molding the rubber mold 50 and the mold is closed. The rubber material is then poured into the space 58 between the mold 56 and the master mold 46 and allowed to harden. The rubber mold 50 is then demolded as shown in FIG. 2(D), yielding the rubber mold 50. As shown in FIG. 5, a plurality of mounting holes 54 are provided on the molding surface 50A of the resulting rubber mold 50 (the surface of the rubber mold 50 for molding the plaster mold 52).

In step 4, as shown in Figure 2(E), the void molding material 42 is inserted into the mounting hole 54 of the rubber mold 50 and attached. As a result, as shown in Figure 6, the void molding material 42 is fixed to the rubber mold 50 with a portion of it (embedded portion 42B) embedded in the rubber mold 50 and the remaining portion (molded portion 42A) protruding from the molding surface 50A.

In step 5, as shown in Figure 2 (F), plaster is poured into the rubber mold 50 to which the void molding material 42 is attached, to create a plaster mold 52 with the void molding material 42 fixed in place. In more detail, as shown in Figure 6, the rubber mold 50 is placed in a mold 60 for molding the plaster mold 52 and closed, and plaster is poured onto the molding surface 50A of the rubber mold 50 and allowed to harden. At this time, the void molding material 42 is fixed in a state where a portion of it is embedded in the plaster mold 52. The plaster mold 52 is then obtained by demolding.

Figure 7 is a perspective view of a plaster mold 52. A void molding material 42 is fixed to the molding surface 52A of the plaster mold 52 (the surface of the plaster mold 52 used to mold the metal mold 22). In Figure 7, the unevenness of the molding surface 52A and the void molding material 42 are shown with solid lines so that the molding surface 52A and void molding material 42 on the underside can be seen through, and the portion of the void molding material 42 embedded in the plaster mold 52 is shown with dashed lines (the same applies to Figure 8).

In step 6, as shown in Figures 2(G) and 2(H), molten metal is poured into the plaster mold 52 to which the void molding material 42 is fixed, thereby casting the mold body 40 with the void molding material 42 cast inside. Specifically, as shown in Figure 8, the plaster mold 52 is placed inside a mold 62 for molding the metal mold 22 and the mold is closed, and molten metal is poured into the space 64 between the mold 62 and the plaster mold 52. After solidification by cooling, the mold is opened and the plaster mold 52 is destroyed, as shown in Figure 9. This forms the mold 22 as shown in Figure 2(I), which is then machined, polished, and other processes to achieve its final shape.

In the first embodiment of the manufacturing method described above, as shown in Figures 6 and 10 (C) to (D), the void molding material 42 is attached to the rubber mold 50 together with the support member 66 in a state in which the void molding material 42 is supported using the support member 66, and in this state, plaster is poured into the rubber mold 50 to create a plaster mold 52 in which the void molding material 42 is fixed.

The support member 66 is embedded in the rubber mold 50 together with the void molding material 42 and supports the position of the void molding material 42 protruding from the molding surface 50A of the rubber mold 50. By supporting the void molding material 42 in this manner, the position of the void molding material 42 can be stabilized when plaster is poured into the rubber mold 50. This improves the positioning accuracy of the void molding material 42 in the plaster mold 52, and improves the positioning accuracy of the void molding material 42 cast into the mold body 40.

In this example, the support members 66 are provided in contact with both side surfaces of the plate-shaped void molding material 42 so as to support the void molding material 42 from both sides. More specifically, as shown in FIGS. 6 and 10(C), the support members 66 are connected across both widthwise sides of the embedded portion 42C of the void molding material 42 in the rubber mold 50, spanning the deepest part. That is, the support member 66 has a shape in which a pair of rod-shaped support bars 66A, 66A extend in the depth direction along both side surfaces of the void molding material 42 in the embedded portion 42C of the void molding material 42, and are connected by a connecting portion 66B spanning the deepest part of the embedded portion 42C. Therefore, the support member 66 has a so-called U- or C-shape. Having a shape in which both sides are connected in this way further improves the positioning accuracy of the void molding material 42.

In this embodiment, the support member 66 is made of the same material as the mold body 40, i.e., a soft metal such as aluminum or an aluminum alloy. This makes it easier to finish the surface of the tread molding surface 40A when the support member 66 is exposed to the tread molding surface 40A of the mold 22, and also minimizes the impact on the tire appearance quality due to transfer to the tire T.

One support member 66 may be provided for each void molding material 42, but preferably, each void molding material 42 is supported by multiple support members 66. This allows for increased positioning accuracy of the void molding material 42. In the example shown in Figure 6, each void molding material 42 is supported by two support members 66, 66, with a support member 66 provided at each end of the void molding material 42 in the longitudinal direction.

Here, when the longitudinal dimension of the void molding material 42 is the total length L (see Figure 11), the two ends of the void molding material 42 refer to the range (L1) within 30% of the total length L from each of the two longitudinal ends of the void molding material 42. It is preferable that the support members 66 be installed at positions 10 to 30% of the total length L from each of the two ends of the void molding material 42. More preferably, in addition to the two ends, support members 66 are also installed in the longitudinal center, so that the void molding material 42 is supported at three locations in the longitudinal direction.

In this embodiment, since the support member 66 is used to support the void molding material 42, it is preferable to attach the mounting hole molding material 48 to the master mold 46 in step 2 above as follows. As shown in Figure 3, a protrusion 68 corresponding to the shape of the support member 66 is provided on the mounting hole molding material 48. The protrusion 68 is used to mold an insertion recess 70 (see Figure 5) into the rubber mold 50 for inserting the support member 66.

By providing protrusions 68 on the mounting hole molding material 48, the rubber material is filled along the shape of the protrusions, as shown in Figure 10(A). Therefore, as shown in Figures 10(B) and 5, the mounting holes 54 formed on the molding surface 50A of the rubber mold 50 have a shape corresponding to the embedded portion 42B of the void molding material 42, and also have an insertion recess 70 for the support member 66.

Next, in step 4 above, as shown in Figures 10(C) and 6, the void molding material 42 is inserted into the mounting hole 54 along with the support member 66 and attached. Because the insertion recess 70 has been formed as described above, these can be attached without any gaps.

In the first embodiment, the support member 66 is attached to the rubber mold 50 in a state where it protrudes from the molding surface 50A of the rubber mold 50. That is, a portion 66C of the support member 66 protrudes from the molding surface 50A, and this protruding portion 66C also supports the void molding material 42. This allows for even greater positioning accuracy for the void molding material 42.

When the plaster mold 52 is produced in step 5, the portion 66C exposed to the outside from the rubber mold 50 is embedded within the plaster mold 52 as shown in Figures 10(D) and 10(E). Therefore, as shown in Figure 11, the plaster mold 52 is produced with the portion 66C of the support member 66 embedded together with the molded portion 42A of the void molding material 42.

Next, in step 6, when molten metal is poured into the plaster mold 52, the portion of the plaster mold 52 exposed from the molding surface 52A becomes embedded in the mold body 40, as shown in Figure 10(F). Therefore, as shown in Figures 10(G) and 9, the portion 66C of the support member 66 embedded in the plaster mold 52 protrudes from the tread molding surface 40A together with the molding portion 42A of the void molding material 42. Therefore, as shown in Figure 10(H), after the mold body 40 is cast, this protruding portion 66C of the support member 66 is removed.

As shown in Figure 10(G), the support member 66 preferably has a breakable portion 72 for removing the portion 66C. The breakable portion 72 may have various configurations that facilitate the removal of the portion 66C from the support member 66, and in this example is configured as a notch.

Figures 12(A) to 12(H) are cross-sectional views of key parts to explain the manufacturing process of the mold 22 according to the second embodiment, and Figure 13 is a perspective view of key parts of the plaster mold 52 according to the second embodiment.

In the second embodiment, as shown in FIG. 12(C), the support member 66X is attached to the rubber mold 50 in a state where it does not protrude from the molding surface 50A of the rubber mold 50, which differs from the support member 66 of the first embodiment, which is attached to the rubber mold 50 in a state where it protrudes from the molding surface 50A of the rubber mold 50.

In detail, the support member 66X, like the first embodiment, has a shape that is connected across both sides of the width across the deepest part of the embedded portion 42C of the void molding material 42 in the rubber mold 50, and includes a pair of support bars 66A, 66A and a connecting portion 66B. However, the length of the support bars 66A, 66A on both sides differs from the support member 66 of the first embodiment. In the support member 66X, the support bar 66A is formed short so that it does not protrude from the molding surface 50A of the rubber mold 50. Therefore, a cavity 74 is provided between the tip 66X1 (the tip of the support bar 66A) of the support member 66X and the molding surface 50A. The cavity 74 is provided as the open end of the insertion recess 70, and in this example, is formed wider than the portion into which the support member 66X is fitted.

As shown in Figures 12(A) and 12(B), as in the first embodiment, a mounting hole molding material 48 with protrusions 68 corresponding to the shape of the support member 66X is attached to a master mold 46 to create a rubber mold 50. The void molding material 42 is inserted and attached together with the support member 66X into the mounting hole 54 having an insertion recess 70 formed thereby. In this case, in the second embodiment, a cavity 74 is formed between the tip 66X1 of the support member 66X and the molding surface 50A, as shown in Figure 12(C).

Next, when the plaster mold 52 is produced in step 5, in the second embodiment, as shown in FIG. 12(D), the support member 66X does not have a portion that is embedded in the plaster mold 52, and the tip 66X1 of the support member 66X is located away from the molding surface 52A of the plaster mold 52. In detail, as shown in FIGS. 12(E) and 13, a plaster protrusion 76 that protrudes from the molding surface 52A is molded by a cavity 74 on the molding surface 52A of the plaster mold 52, and the tip 66X1 of the support member 66X is located on the upper surface of the plaster protrusion 76. Therefore, in this example, after the plaster mold 52 is demolded and removed, the plaster protrusion 76 is scraped off and removed, as shown in FIG. 12(F).

Then, in step 6, when molten metal is poured into the plaster mold 52, as shown in Figures 12(G) and 12(H), the support members 66X are entirely embedded within the mold body 40, and none of the support members 66X are exposed to the tread molding surface 40A. In other words, while the void molding material 42 protrudes from the tread molding surface 40A, the support members 66X installed to support it are entirely embedded within the mold body 40 and are not exposed to the tread molding surface 40A. This prevents deterioration of the tire's appearance quality.

In the second embodiment, the support member 66X preferably supports the void molding material 42 in a range of 70 to 95% of the depth from the deepest part in the embedded portion 42C of the void molding material 42 in the rubber mold 50. In other words, in the embedded portion 42C of the void molding material 42, where the depth from the deepest part to the molding surface 50A is D0, the range D1 supported by the support member 66X (the range from the deepest part to the tip 66X1) preferably is 70 to 95% of D0. By supporting 70 to 95% of the area from the deepest part with the support member 66X in this way, the function of supporting the void molding material 42 is ensured, while the effect of preventing the support member 66X from being exposed to the tread molding surface 40A can be more reliably achieved.

With the exception of the above, the other components of the second embodiment, including the support member 66X, are basically the same as the support member 66 and other components of the first embodiment, and therefore further description will be omitted.

Figure 14 is a perspective view of a main portion of a plaster mold 52 according to the third embodiment. In the third embodiment, the support member 66Y differs from the support member 66 of the first embodiment in that it is not connected across both sides of the width of the void molding material 42. That is, in the third embodiment, the support member 66Y consists of a pair of rod-shaped support bars 66A, 66A that support the void molding material 42 from both sides, and both are provided separately. Note that while Figure 14 only shows the support member 66Y on the front side, a similar support member 66Y is also provided on the opposite side.

As with the first embodiment, the support member 66Y is attached to the rubber mold 50 in a state where it protrudes from the molding surface 50A of the rubber mold 50, and therefore the plaster mold 52 is created with a portion 66C of this protruding support member 66Y embedded in it, and the portion 66C of the support member 66Y protruding from the tread molding surface 40A of the mold body 40 is removed after the mold body 40 is cast.

With the exception of the above, the other configurations of the third embodiment, including the support member 66Y, are basically the same as the support member 66 and other configurations of the first embodiment, and therefore further description will be omitted.

The above embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments may be embodied in a variety of other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention.

22...Tire manufacturing mold, 40...Mold body, 40A...Tread molding surface, 42...Void molding material, 42A...Embedded portion, 50...Rubber mold, 50A...Molding surface, 52...Gypsum mold, 52A...Molding surface, 66, 66X, 66Y...Support member, 72...Fracture portion

Claims (8)

A method for manufacturing a tire manufacturing mold, comprising: a mold body for molding a tread surface; and a void molding material made of a different material from the mold body for molding voids in the tread surface,
Attaching the void molding material together with the support member to a rubber mold in a state in which the void molding material is supported by the support member;
Pour plaster into the rubber mold while the void molding material is supported to prepare a plaster mold in which the void molding material is fixed; and
Casting the mold body with the void molding material cast in it by pouring metal into the gypsum mold;
Including,
the support member is a member that is embedded in the rubber mold together with the void molding material and supports the posture of the void molding material protruding from the molding surface of the rubber mold.
A method for manufacturing molds for tire manufacturing. The method for manufacturing a tire manufacturing mold described in claim 1, wherein the support member is attached to the rubber mold in a state where it protrudes from the molding surface of the rubber mold, thereby creating the plaster mold with the protruding portion embedded, and after casting the mold body, removing the portion of the support member protruding from the tread molding surface of the mold body. A method for manufacturing a tire manufacturing mold, comprising: a mold body for molding a tread surface; and a void molding material made of a different material from the mold body for molding voids in the tread surface,
Attaching the void molding material together with the support member to a rubber mold in a state in which the void molding material is supported by the support member;
Pour plaster into the rubber mold while the void molding material is supported to prepare a plaster mold in which the void molding material is fixed; and
Casting the mold body with the void molding material cast in it by pouring metal into the gypsum mold;
Including,
the support member is attached to the rubber mold in a state where it protrudes from the molding surface of the rubber mold, and the plaster mold is prepared in a state where the protruding portion is embedded; and after casting the mold body, the part of the support member protruding from the tread molding surface of the mold body is removed,
a method for manufacturing a tire manufacturing mold, wherein the support member has a breaking portion for removing the portion, and after the mold body is cast, the support member is broken using the breaking portion to remove the portion. A method for manufacturing a tire manufacturing mold, comprising: a mold body for molding a tread surface; and a void molding material made of a different material from the mold body for molding voids in the tread surface,
Attaching the void molding material together with the support member to a rubber mold in a state in which the void molding material is supported by the support member;
Pour plaster into the rubber mold while the void molding material is supported to prepare a plaster mold in which the void molding material is fixed; and
Casting the mold body with the void molding material cast in it by pouring metal into the gypsum mold;
Including,
The method for manufacturing a mold for manufacturing a tire includes attaching the support member to the rubber mold in a state where the support member does not protrude from the molding surface of the rubber mold. The method for manufacturing a tire manufacturing mold described in claim 4, wherein the support member supports the void molding material in a range of 70 to 95% of the depth from the deepest part of the void molding material embedded in the rubber mold. A method for manufacturing a tire manufacturing mold, comprising: a mold body for molding a tread surface; and a void molding material made of a different material from the mold body for molding voids in the tread surface,
Attaching the void molding material together with the support member to a rubber mold in a state in which the void molding material is supported by the support member;
Pour plaster into the rubber mold while the void molding material is supported to prepare a plaster mold in which the void molding material is fixed; and
Casting the mold body with the void molding material cast in it by pouring metal into the gypsum mold;
Including,
A method for manufacturing a tire manufacturing mold , wherein a plurality of the void molding materials are provided in the mold body, and each void molding material is supported by a plurality of the support members. A method for manufacturing a tire manufacturing mold, comprising: a mold body for molding a tread surface; and a void molding material made of a different material from the mold body for molding voids in the tread surface,
Attaching the void molding material together with the support member to a rubber mold in a state in which the void molding material is supported by the support member;
Pour plaster into the rubber mold while the void molding material is supported to prepare a plaster mold in which the void molding material is fixed; and
Casting the mold body with the void molding material cast in it by pouring metal into the gypsum mold;
Including,
A method for manufacturing a tire manufacturing mold , wherein the support member is connected across the deepest part of the void molding material embedded in the rubber mold and on both sides in the width direction. The method for manufacturing a tire manufacturing mold according to any one of claims 1 to 7 , wherein the support member is made of the same material as the mold body.