JP5866863B2 - Manufacturing method of tire vulcanization mold - Google Patents

Description

The present invention relates to a method of manufacturing a tire vulcanizing mold, further detail, the slits of the exhaust mechanism for opening the mold surface, a method of manufacturing a conveniently precisely predetermined tire vulcanizing mold can be formed in the gap is there.

  The tire vulcanization mold is provided with an exhaust mechanism that discharges air remaining between the green tire and the mold and gas generated during vulcanization to the outside of the mold. Conventionally, various exhaust mechanisms that do not generate spew have been proposed (see, for example, Patent Documents 1 and 2).

  Patent Document 1 proposes an exhaust mechanism using a laminated blade in which a thin plate is bent to overlap one end and a large gap is secured to the other end in order to ensure sufficient exhaust. The laminated blade is held by a block, and an exhaust chamber surrounded by the pocket and the block is formed by fitting the block into a concave pocket on the molding surface of the mold. Air or gas is discharged into the exhaust chamber through a minute gap at one end of the laminated blade and a large gap at the other end. However, this exhaust mechanism requires a step of forming a pocket on the tire molding surface of the cast mold, a step of manufacturing an assembly in which a laminated blade is held on a block, and a step of fitting this assembly into the pocket. There is a problem in that the number of processing steps increases and the time required for manufacturing becomes long. In addition, since an appropriate space is required to provide this exhaust mechanism, it is difficult to form a gap for discharging air or gas at a desired position.

  In invention of patent document 2, when casting the piece which comprises a mold, a molten metal is divided and shot in multiple times. In the cast piece, a fine gap due to solidification shrinkage of the molten metal is formed at the joint portion between shots, and this gap becomes an exhaust passage. However, in the present invention, since the molten metal must be shot in a plurality of times, there is a problem in that the number of processing steps is increased and the time required for manufacturing becomes long. In addition, it is difficult to accurately form a predetermined gap slit.

JP 2008-260135 A JP 2000-229322 A

An object of the present invention is to provide a method for manufacturing a mold for tire vulcanization, in which a slit of an exhaust mechanism that opens on a mold surface can be easily and accurately formed with a predetermined gap.

In order to achieve the above object, the tire vulcanization mold manufacturing method of the present invention is a tire for manufacturing a mold in which a molten metal is poured onto the surface of a gypsum mold and the molten metal is solidified to transfer the surface shape of the gypsum mold. In the method for producing a mold for vulcanization, a recess of a blade provided with irregularities on its surface is filled with a readily disintegratable refractory material, and only this recess is covered with a coating layer made of the easily disintegratable refractory material, By embedding only the anchor portion protruding at one end of the blade in the gypsum mold, the blade is protruded from the surface of the gypsum mold and molten metal is poured into the surface of the gypsum mold, After the shape of the surface is transferred and the mold in which the blade is cast is cast, a slit is formed in the concave portion of the blade by removing the coating layer. Form, the slit is communicated exhaust hole and communicating leading to the outside of the mold, and, and removing the anchor portion projecting from the mold surface.

Further, another tire vulcanizing mold manufacturing method of the present invention is a tire vulcanizing method in which a molten metal is poured onto the surface of a gypsum mold, and the molten metal is solidified to manufacture a mold in which the surface shape of the gypsum mold is transferred. In the mold manufacturing method, a blade having a concavo-convex surface is a sipe forming blade, and a recess of the sipe forming blade is filled with a readily disintegrating refractory material, and only the recessed portion is the aforementioned easily disintegrating refractory material. The sipe forming blade is embedded in the gypsum mold in a state where the sipe forming blade is embedded in the gypsum mold, and the gypsum mold is disposed so as to protrude from the surface of the gypsum mold. After casting a molten metal into the surface of the mold to transfer the shape of the surface of the gypsum mold and casting the sipe forming blade, A slit is formed in the concave portion of the sipe forming blade by removing the layer, and the slit is communicated with an exhaust hole communicating with the outside of the mold, and the blade portion is protruded from the mold surface. Features.
Another method for manufacturing a tire vulcanizing mold according to the present invention is a method for manufacturing a tire for vulcanizing a tire in which a molten metal is poured onto the surface of a gypsum mold and the molten metal is solidified to manufacture a mold in which the surface shape of the gypsum mold is transferred. In the method for producing a mold, an easily disintegrating refractory material is filled in a concave portion of a blade provided with unevenness on both surfaces and the concave portion and the concave portion provided on each surface are opposed to each other, and only the concave portion is easily The blade is placed on the surface of the gypsum mold with the coating layer made of a disintegrating refractory material, and the molten metal is poured into the surface of the gypsum mold to transfer the shape of the surface of the gypsum mold. In addition, after casting the mold in which the blade is cast, a slit is formed in the concave portion of the blade by removing the coating layer, and the slit is formed outside the mold. And characterized in that through the exhaust hole and the communication leading to.

  According to the method for manufacturing a mold for vulcanizing a tire of the present invention, a recess of a blade having an uneven surface is filled with a readily disintegratable refractory material, and only the recess is covered with a coating layer made of the easily disintegratable refractory material. The mold is cast in the coated state, and then the coating layer is removed to form a slit in the recess of the blade. That is, since the concave portion to be the slit is a portion formed in the blade in advance, the slit can be accurately formed by setting the concave portion to a predetermined depth and with a simple work process. Then, the exhaust mechanism provided with the slit opened to the mold surface can be constructed by communicating the formed slit with the exhaust hole communicating with the outside of the mold.

  In the method for manufacturing a mold for vulcanizing a tire according to the present invention, the blade has an anchor portion protruding at one end, and only the anchor portion is embedded in the gypsum mold so that the blade protrudes on the surface of the gypsum mold. After placing and casting the mold, the anchor portion protruding from the mold surface can be removed. Thereby, the slit which opens on the mold surface in a desired position is formed, and the mold in which the blade is embedded without protruding on the tire molding surface can be obtained.

  The blade is a sipe forming blade, and by embedding the blade portion in the gypsum mold, the blade can be disposed with the root portion protruding from the surface of the gypsum mold. Thereby, the mold which has a slit in the recessed part of the root part of the blade for sipe formation cast on the tire molding surface can be obtained.

  The depth of the recess is, for example, 0.01 mm to 0.10 mm. Thereby, the slit which can prevent generation | occurrence | production of a spew can be formed, ensuring sufficient exhaust_gas | exhaustion.

  Concavities and convexities are provided on both surfaces of the blade, and the concave portions and the concave portions provided on the surfaces of the blades can be disposed at opposing positions. This is advantageous for increasing the opening area of the slit in one blade.

  A braided exhaust hole forming member made of a refractory material for casting is attached to the blade arranged so as to protrude from the surface of the gypsum mold so as to be in contact with the coating layer, and is melted on the surface of the gypsum mold in this state. The exhaust hole can be formed by removing the exhaust hole forming member after casting the mold by pouring metal. Thereby, the cutting process for forming an exhaust hole becomes unnecessary. Further, it is possible to obtain a tire vulcanization mold having an exhaust hole of an arbitrary shape such as a bent exhaust hole that cannot be formed by cutting.

It is a top view which illustrates the mold for tire vulcanization manufactured by the present invention. It is a top view which illustrates the sector of FIG. It is a top view which illustrates the left half of the piece of FIG. It is a front view of the piece of FIG. It is a front view which illustrates a blade. FIG. 6 is a plan view of the blade of FIG. 5. It is a top view which illustrates the braid | blade which coat | covered the surface with the easily disintegrating refractory material. It is explanatory drawing which illustrates the process of removing the easily disintegratable refractory material of the convex part of the surface of a braid | blade. It is a top view which illustrates the braid | blade which coat | covered only the recessed part of the surface with the easily disintegrating refractory material. FIG. 10 is a front view of the blade of FIG. 9. It is explanatory drawing which illustrates the process of pouring gypsum into the surface of the rubber type | mold which embedded the braid | blade of FIG. It is sectional drawing which illustrates the process of pouring a molten metal into the surface of the gypsum mold which protruded the blade on the surface. FIG. 13 is a plan view illustrating the step in FIG. 12. It is sectional drawing which illustrates the process of removing an anchor part, a coating layer, and an exhaust hole formation member from the cast piece. It is a front view which shows the modification of a braid | blade. FIG. 16 is a cross-sectional view illustrating a step of pouring molten metal into the surface of a gypsum mold in which the blade of FIG. It is a top view which illustrates the left half of the completed piece. It is a front view of the piece of FIG. It is a top view which shows the other modification of a braid | blade.

Hereinafter, the manufacturing method of the mold for tire vulcanization of the present invention is explained based on the embodiment shown in the figure. C arrow, R arrow, and W arrow described in the drawings indicate a circumferential direction, a radial direction, and a width direction of a green tire that is inserted into a vulcanization mold and vulcanized.

As illustrated in FIGS. 1 to 4, a tire vulcanization mold 1 (hereinafter, referred to as a mold 1) manufactured according to the present invention is a sectional type configured by assembling a plurality of sectors 2 in a ring shape. Each sector 2 includes a plurality of pieces 3 and a back block 4, and is attached to the back block 4 in a state where adjacent pieces 3 are in close contact with each other. In this embodiment, four rectangular pieces 3 are fixed to one sector 2 in plan view. The inner peripheral surface of each piece 3 is a tire molding surface 5. The piece 3 is formed by solidifying a molten metal M obtained by melting a metal material such as aluminum or an aluminum alloy.

  Groove forming projections 6 that form tire grooves are provided integrally with the piece 3 on the tire forming surface 5. Further, a blade 7 made of stainless steel or the like is cast and embedded on the tire molding surface 5 without protruding.

  As illustrated in FIG. 5 and FIG. 6, the blade 7 has a surface irregularity having a concave portion 8 a and a convex portion 8 b on both surfaces, and the thickness is about 0.4 mm to 1.2 mm. The depth t of the recess 8a is a gap t of the slit 9 formed in the piece 3, and is set to 0.01 mm to 0.10 mm, more preferably 0.02 mm to 0.04 mm. The number of the concave portions 8a and the convex portions 8b is arbitrary.

  In this embodiment, an anchor portion 7 a is projected from one end of the blade 7. The anchor portion 7a is removed from the main body portion of the blade 7 in a subsequent process. Therefore, it is preferable that the anchor portion 7a is connected to the main body portion (a portion other than the anchor portion 7a) of the blade 7 in a constricted state. In this embodiment, the anchor portion 7a has a triangular shape and is connected to the main body portion of the blade 7 at its apex.

  Further, a projecting portion 7c is provided on the side opposite to the side where the anchor portion 7a is projected (the other end of the blade 7). Further, three through holes 7b are formed in a portion corresponding to the convex portion 8b. A lateral groove 8c (concave portion) is formed on the convex portion 8b sandwiched between the concave portions 8a so as to connect adjacent concave portions 8a. The through hole 7b, the protruding portion 7c, and the lateral groove 8c can be arbitrarily provided.

  The blade 7 is embedded in the piece 3, and the concave portion 8a is not filled with a metal material as illustrated in FIG. The slit 9 is formed by removing a coating layer 11 (to be described later) that has covered the recess 8a after the piece 3 is cast. The slit 9 communicates with the exhaust hole 10 leading to the outside of the piece 3 (mold 1).

  In order to prevent the occurrence of spew while ensuring sufficient exhaust through the slit 9, the gap t of the slit 9 is preferably in the range of 0.01 mm to 0.10 mm. More preferably, the clearance t is set to 0.02 mm to 0.04 mm. In FIG. 3, the slit 9 is exaggerated and enlarged.

The exhaust hole 10 of this embodiment is formed by removing a string-like exhaust hole forming portion described later after the piece 3 is cast. The size of the exhaust hole 10 is about 1 mm to 10 mm corresponding to the outer diameter. In FIG. 4, the exhaust hole 10 is bent, but it may be a straight exhaust hole 10. The exhaust hole 10 can also be formed by machining. When the green tire is vulcanized using the mold 1 assembled with the piece 3, unnecessary air and gas are exhausted to the exhaust hole 10 through the slit 9, and further the sector. 2 is discharged to the outside of the mold 1 through the end face of the plate 2 and the like. In this way, it is possible to ensure appropriate exhaust during vulcanization, so that tire vulcanization failures are prevented.

  A method for manufacturing the piece 3 will be exemplified below.

  First, a readily disintegrating refractory material is applied to the surface of the blade 7 illustrated in FIGS. 5 and 6 by spraying or the like. Thereby, as illustrated in FIG. 7, the concave portion 8 a and the convex portion 8 b on the surface of the blade 7 are covered with the easily disintegratable refractory material. The recess 8a is filled with a collapsible refractory material. In the drawing, the covering layer 11 is indicated by oblique lines.

  The easily disintegratable refractory material to be the coating layer 11 is easily dissolved in water or easily broken by impact, and examples thereof include solid materials containing a coating material, gypsum, and a graphite-based release material. The coating material is applied to a portion of the casting mold that contacts the molten metal and functions as a heat insulating material or a protective material for the casting mold. The components of the coating material are, for example, water, sodium silicate, vermiculite, mica, and bentonite. Moreover, the component of a graphite-type mold release material is graphite, n-hexane, dimethyl ether, ethanol, isopropyl alcohol, for example.

  Next, as illustrated in FIG. 8, the surface of the blade 7 is rubbed with a coating layer removing tool 17 such as a file. Thereby, the easily disintegrating refractory material covering the convex portion 8b of the blade 7 is removed. When the easily disintegratable refractory material covering the convex portion 8b is removed, finally, as illustrated in FIG. 9 and FIG. 10, only the concave portion 8a on the surface of the blade 7 is removed from the easily disintegratable refractory material. It becomes the state coat | covered with the coating layer 11 which becomes. It is preferable that the peripheral portion of the through hole 7b is not covered with the coating layer 11 and the base of the blade 7 is left exposed.

  As illustrated in FIG. 11, the blade 7 is embedded in the rubber mold 15 so that only the anchor portion 7 a protrudes from the surface of the rubber mold 15. The rubber mold 15 is formed by transferring the surface shape of the master mold.

  Next, gypsum P is poured into the surface of the rubber mold 15 to produce a gypsum mold 13 in which the surface shape of the rubber mold 15 is transferred. As illustrated in FIGS. 12 and 13, the manufactured gypsum mold 13 is in a state where only the anchor portion 7 a of the blade 7 is embedded. That is, the main body portion of the blade 7 protrudes from the surface 13 a of the gypsum mold 13 and is exposed. The groove 13 b of the plaster mold 13 is a portion corresponding to the groove forming protrusion 6 of the mold 1.

  Next, molten metal M is poured into the surface of the gypsum mold 13 to cast the mold 1. At that time, as illustrated in FIG. 12 and FIG. 13, the string-like exhaust hole forming member 12 made of a cast refractory material is placed on the main body portion of the blade 7 disposed so as to protrude from the surface 13 a of the gypsum mold 13. And attached so as to be in contact with the coating layer 11. At this time, when the mold 1 is cast by extending the end of the exhaust hole forming member 12 until it contacts the mold 14 and casting the molten metal M, a part of the exhaust hole forming member 12 is exposed from the mold 1. Arrange to do. Since the exhaust hole 10 is formed by removing the exhaust hole forming member 12 in a subsequent process, the thickness of the exhaust hole forming member 12 is set to about 1 mm to 10 mm corresponding to the outer diameter.

  When the projecting portion 7c is provided on the portion (main body portion) of the blade 7 disposed on the surface 13a of the plaster mold 13, the exhaust hole forming member 12 can be inserted into the projecting portion 7c and attached to the blade 7. Therefore, the malfunction which the exhaust hole formation member 12 shifts | deviates by pouring can be prevented. Alternatively, a notch portion may be provided in a portion (main body portion) disposed on the surface 13 a of the plaster mold 13 of the blade 7, and the exhaust hole forming member 12 may be fitted to the notch portion and attached to the blade 7. Providing such a notch can also prevent the exhaust hole forming member 12 from being displaced due to pouring.

  The refractory material for casting that forms the exhaust hole forming member 12 is a member that is installed in a portion in contact with the molten metal, such as an aluminum melting furnace, a casting frame surface, and the like, and is used to prevent erosion wear due to the molten aluminum. . Examples of the refractory material for casting include a mold seal and a heat insulating material for casting.

  The main components of the mold seal are kaolin, bentonite, talc and mineral oil. The main components of the heat insulating material for casting are alumina and silica. The mold seal is flexible and can be easily transformed into any shape. Therefore, by using a mold seal as the exhaust hole forming member 12, the exhaust hole 10 having an arbitrary shape such as a bent exhaust hole that cannot be formed by cutting can be formed.

  The molten metal M is poured into the surface 13a of the gypsum mold 13 in this state, and the molten metal M is solidified to cast the piece 3 to which the shape of the surface 13a of the gypsum mold 13 is transferred. Only the anchor portion 7 a of the blade 7 protrudes from the cast piece 3, and the main body portion is embedded on the surface of the piece 3 without protruding. The main part of the blade 7 is in a state of being embedded in the piece 3 while being covered with the covering layer 11. A part of the exhaust hole forming member 12 is exposed from the end surface of the piece 3.

  Next, as illustrated in FIG. 14, the anchor portion 7 a protruding from the surface of the cast piece 3 is removed. The anchor portion 7a is removed manually or using a tool such as a cutting device or a grinding device. By removing the anchor portion 7 a, the upper end of the blade 7 becomes the same level as the surface of the piece 3.

  Further, the covering layer 11 and the exhaust hole forming member 12 embedded in the piece 3 are removed. For example, the coating layer 11 and the exhaust hole forming member 12 are removed by spraying the high pressure water flow ejected from the spray nozzle 16 onto the coating layer 11 and the exhaust hole forming member 12. The place where the covering layer 11 is removed becomes the slit 9, and the place where the exhaust hole forming member 12 is removed becomes the exhaust hole 10.

  Since a part of the exhaust hole forming member 12 is exposed from the end face of the piece 3, the formed exhaust hole 10 communicates with the outside of the piece 3. Further, since the exhaust hole forming member 12 is in contact with the coating layer 11, the slit 9 and the exhaust hole 10 communicate with each other. Therefore, air remaining between the green tire and the mold 1 (piece 3) during vulcanization or gas generated during vulcanization is discharged to the outside of the mold 1 through the slit 9 and the exhaust hole 10.

  In this embodiment, the adjacent slits 9 (recesses 8a) communicate with each other by the lateral grooves 8c. Therefore, each slit 9 can be used without waste for discharging air and gas.

  The concave portion 8a provided in the blade 7 can be extended not only linearly from the tire molding surface 5 toward the back side of the piece 3, but also inclined. Further, the plurality of recessed portions 8a extended can be crossed in a lattice shape. The total length of the recesses 8 a on one surface of the blade 7 is about 10% to 90% of the total length of the blade 7.

  As described above, in the present invention, the concave portion 8a to be the slit 9 is formed in the blade 7 in advance by machining or pressing, so that it can be processed to a predetermined depth t with high accuracy without variation. A slit 9 having a predetermined gap t can be formed. Moreover, the slit 9 can be formed by a simple work process without performing complicated work. By connecting the slit 9 to the exhaust hole 10 communicating with the outside of the piece 3, an exhaust mechanism including the slit 9 opening on the surface of the piece 3 can be constructed.

  Moreover, in this embodiment, the blade 7 can be placed and fixed at a desired position on the surface 13 a of the gypsum mold 13 by the anchor portion 7 a protruding from one end of the blade 7. Accordingly, the slit 9 can be formed at a desired position on the tire molding surface 5 of the piece 3.

  For example, when a part of the blade 7 is simply embedded in the gypsum mold 13, the blade 7 is projected from the surface 13 a of the gypsum mold 13, the molten metal M is poured into the piece 3, and the piece 3 is cast. A part of the blade 7 protrudes. Therefore, when the tire is vulcanized using this piece 3, an unintended recess is formed on the surface of the tire due to the protruding portion of the blade 7. Therefore, in order not to form an unintended recess in the vulcanized tire, it is necessary to place the blade 7 on the surface 13 a of the gypsum mold 13 without being embedded in the gypsum mold 13. However, the blade 7 cannot be fixed at a desired position simply by being placed on the surface 13a of the plaster mold 13. Such a problem is solved by providing an anchor portion 7a to be removed in a later step so as to protrude from one end of the blade 7.

  Furthermore, in this embodiment, the exhaust hole 10 can be easily formed by casting the exhaust hole forming member 12. Therefore, after the piece 3 is cast, a cutting process for forming the exhaust hole 10 becomes unnecessary.

  Without attaching the exhaust hole forming member 12 to the blade 7, the piece 3 can be cast by pouring the molten metal M into the surface 13 a of the gypsum mold 13. In this case, the slit 9 is formed by removing the coating layer 11 after casting the piece 3, but the exhaust hole 10 needs to be formed separately. Therefore, by cutting the piece 3, an exhaust hole 10 communicating with the slit 9 and communicating with the outside of the piece 3 is formed.

  In this embodiment, the piece 3 is cast by pouring the molten metal M with the peripheral portion of the through-hole 7b exposed to the base of the blade 7 exposed. Therefore, even if the coating layer 11 is removed after the casting of the piece 3, the peripheral portion of the through hole 7b and the solidified molten metal M are in close contact with each other, so that the blade 7 is firmly fixed to the piece 3 and is difficult to come off. Become.

  A blade 7 as illustrated in FIG. 15 can also be used. The blade 7 is a sipe forming blade 7 having a concave portion 8a and a convex portion 8b on the surface, and a blade portion 7e for forming a sipe. That is, the blade portion 7e is provided instead of the anchor portion 7a of the blade 7 illustrated in FIG. The through hole 7b, the protruding portion 7c, and the lateral groove 8c can be arbitrarily provided.

  Also when this blade 7 is used, the recess 8a is filled with the easily disintegratable refractory material and only the recess 8 is covered with the coating layer 11 by the process illustrated in FIGS. Then, as illustrated in FIG. 16, by burying the blade portion 7 e in the gypsum mold 13, the blade 7 is disposed with the root portion 7 d protruding from the surface 13 a of the gypsum mold 13.

  Molten metal M is poured into the surface 13a of the gypsum mold 13 to transfer the shape of the surface 13a of the gypsum mold 13 and the piece 3 into which the blade 7 is cast is cast. Thereafter, the cover layer 11 and the exhaust hole forming member 12 embedded in the piece 3 are removed to form the slit 9 and the exhaust hole 10 communicating with the slit 9. Since a part of the exhaust hole forming member 12 is exposed from the end face of the piece 3, the formed exhaust hole 10 communicates with the outside of the piece 3. Accordingly, as illustrated in FIGS. 17 and 18, the piece 3 having the slit 9 in the concave portion 8 a of the root portion 7 d of the sipe forming blade 7 cast into the tire molding surface 5 can be obtained.

  When the concave portions 8 a and the convex portions 8 b are provided on both surfaces of the blade 7, as illustrated in FIG. 9, if the concave portions 8 a and the concave portions 8 a provided on the surfaces of the blades 7 are arranged at opposing positions, The opening area of the slit 9 can be easily increased.

  As illustrated in FIG. 19A, when the concave portion 8a and the convex portion 8b are provided on both surfaces of the blade 7, the concave portion 8a provided on one surface of the blade 7 and the convex portion 8b provided on the other surface; Can also be arranged at opposing positions. This is advantageous in preventing the minimum thickness of the blade 7 from becoming too small.

  As illustrated in FIG. 19B, the recess 8 a can be provided only on one surface of the blade 7. As illustrated in FIG. 19 (c), a plurality of blades 7 in which a concave portion 8a provided on one surface and a convex portion 8b provided on the other surface are opposed to each other can be laminated. . Alternatively, as illustrated in FIG. 19D, a plurality of blades 7 in which the concave portions 8a and the concave portions 8a provided on the surfaces of the blades 7 are opposed to each other can be stacked.

DESCRIPTION OF SYMBOLS 1 Mold 2 Sector 3 Piece 4 Back block 5 Tire shaping | molding surface 6 Groove shaping | molding protrusion 7 Blade 7a Anchor part 7b Through-hole 7c Protruding part 7d Root part 7e Blade part 8a Recessed part 8b Convex part 8c Horizontal groove 9 Slit 10 Exhaust hole 11 Covering layer 12 Exhaust hole forming member 13 Gypsum mold 13a Surface 13b Groove 14 Mold 15 Rubber mold 16 Injection nozzle 17 Cover layer removing tool M Molten metal P Gypsum

Claims (5)

In a method for manufacturing a mold for vulcanizing a tire, in which a molten metal is poured onto the surface of a gypsum mold, and the molten metal is solidified to produce a mold in which the shape of the surface of the gypsum mold is transferred. By filling an easily disintegratable refractory material, with only the recesses covered with the coating layer made of the easily disintegratable refractory material, and embedding only the anchor portion protruding at one end of the blade in the plaster mold. Then, this blade is disposed so as to protrude from the surface of the gypsum mold, and a molten metal is poured into the surface of the gypsum mold to transfer the shape of the surface of the gypsum mold and cast the mold into which the blade is cast, wherein by removing the coating layer to form a slit in the concave portion of the blade, it is communicated exhaust hole and communicating communicating the slit to the outside of the mold, or The method of tire vulcanizing mold, and removing the anchor portion projecting from the mold surface. In a manufacturing method of a tire vulcanization mold, in which molten metal is poured onto the surface of the gypsum mold and the molten metal is solidified to produce a mold in which the shape of the surface of the gypsum mold is transferred, a blade having irregularities on the surface forms a sipe. The sipe forming blade is filled with a readily disintegratable refractory material, and only the recessed portion is covered with the coating layer made of the easily disintegratable refractory material . By burying the blade part in the gypsum mold, this sipe forming blade is arranged to protrude from the surface of the gypsum mold, and molten metal is poured into the surface of the gypsum mold to transfer the shape of the surface of the gypsum mold. wherein after casting a mold was cast the sipe-forming blade, concave of the sipe-forming blade by removing the coating layer as well as Forming a slit, the slit is communicated exhaust hole and communicating leading to the outside of the mold, and method for producing a tire vulcanizing mold, characterized by a state in which the blade portion is projected on the mold surface. Pouring molten metal into the surface of the plaster mold, in the method for manufacturing the molten metal tire vulcanizing mold for producing a mold by transferring the surface shape of the gypsum mold by solidifying a mutual surface irregularities formed on both surfaces The concave portion of the blade disposed in a position facing the concave portion is filled with a readily disintegratable refractory material, and only this concave portion is covered with the coating layer made of the easily disintegratable refractory material. The blade is arranged so as to protrude from the surface of the gypsum mold, the molten metal is poured into the surface of the gypsum mold, the shape of the surface of the gypsum mold is transferred, and the mold in which the blade is cast is cast, and then the coating By removing the layer, a slit is formed in the concave portion of the blade, and the slit is communicated with an exhaust hole communicating with the outside of the mold. Manufacturing method of use mold.   The manufacturing method of the mold for vulcanization | cure in any one of Claims 1-3 which makes the depth of the said recessed part 0.01 mm-0.10 mm. A braided exhaust hole forming member made of a refractory material for casting is attached to the blade arranged so as to protrude from the surface of the gypsum mold so as to be in contact with the coating layer, and is melted on the surface of the gypsum mold in this state. The method for producing a tire vulcanization mold according to any one of claims 1 to 4 , wherein the exhaust hole is formed by removing the exhaust hole forming member after casting the mold by pouring metal.

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