JPH1158389A - Mold for vulcanization molding of tire and method for vulcanization molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple structure and to make vent holes unnecessary or a few no. by a method wherein a top mold dome is stopped once on the midway of descending and air between the inner side face of the mold and the outer side face of an unvulcanized tire is sucked and evacuated and then, after the top and bottom domes and the mold are completely closed and pressure embossing is performed by a pressure fluid, high temp. gas is fed to perform vulcanization molding. SOLUTION: An unvulcanized tire is mounted in a bottom mold 3 and then, a top mold dome 21 is started to be lowered to bring a vulcanizing machine 20 under operating condition. When the top mold dome 21 vertically descends against the bottom mold 22 and the distance d between packings 23 and 24 is at a specified value, the top mold dome 21 is stopped once. During this stopping, air in a closed space between the outerside face of the unvulcanized tire and the inner side face of the mold is evacuated by suction. After a specified degree of vacuum is attained, the top and the bottom domes 21 and 22 are completely closed and a pressure fluid is worked simultaneously on the inner face of the unvulcanized tire to perform shaping. At the same time when shaping is completed, evacuation of air between the inner face of the mold and the outer side face of the vulcanized tire is stopped and a high temp. gas is fed in the domes 21 and 22 to perform vulcanization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION One aspect of the present invention is a tire vulcanization molding die, and more specifically, a split vulcanization type tire vulcanization molding which is removably attached to a vertical dome type vulcanizer. Regarding molds, especially in the case of conventional molds, only a very small amount of processing is performed on them, and in the case of manufacturing a new mold, simple parts are simply added at the time of manufacture. Even if the vent hole processing is omitted or the vent hole is provided, the number is greatly reduced compared to the conventional one, and advantageously vulcanized molding to an unvulcanized tire without causing a bear failure in the tire The vulcanization molding die of the tire that can be applied, and can be stopped at a cost increase that can be offset with the vent hole processing cost, the second of the present invention, the vulcanization molding method of the tire, more specifically, This invention uses one mold Relates ear vulcanization process, in particular,
There is no spew on the tire after vulcanization, and even if spew exists, the number can be reduced to a very small number, so that the number of processing steps and cost can be reduced, and spew removal without generation of bears The present invention relates to a vulcanizing and molding method for a tire capable of providing a tire having excellent appearance with little or no spew removal marks.

[0002]

2. Description of the Related Art When an unvulcanized tire is vulcanized and molded by a mold, a high-pressure gas such as 14 to 28
The unvulcanized tire is pressed against the inner surface of the mold by introducing high-pressure steam, high-pressure nitrogen gas or the like of kgf / cm ² , and the product tire is formed with a predetermined outer contour.

[0003] At this time, when air is trapped (trapped) between the inner surface of the mold and the tire to be vulcanized, the air trap portion is formed on the outer surface of the product tire after vulcanization and molding, which is generally called a bear. It is a well-known fact that a defective appearance portion that is not in contact with the inner surface is formed.

In order to prevent the occurrence of this defect, the mold is provided with a large number of vent holes for letting out the trapped air, and if the defect of the bear still does not improve, a vent groove connecting between the vent holes is cut. Is also well known. Of course, the vent hole penetrates the mold and discharges trapped air to the outside of the mold.

[0005] However, while the vent hole is also an escape route for trapped air, it is inevitable that the rubber having increased fluidity of the unvulcanized tire during vulcanization molding also flows into the vent hole. The rubber that flows into the product tires forms elongated rubber projections called spews when the tires are manufactured. This type of spew has nothing to do with tire performance and rather impairs the appearance of the tire and must be cut off during the finishing process. Therefore, the vent hole is said to be a necessary evil, and the smaller the number, the better, the better.

Therefore, Japanese Patent Application Laid-Open No. 62-21906 proposes a method of molding a pneumatic tire in which no spew exists in vulcanization molding using a mold in which a mold is divided into two and an upper and lower mold. The contents are that a sealing mechanism is provided around each of the upper and lower mold dies, and before each mold is completely closed, a closed space is formed between the upper and lower molds containing the unvulcanized tire. A 10 to 100 kPa fluid is supplied into the internal bladder of the unvulcanized tire to perform preforming, and the unvulcanized tire is placed on top of a tread pattern forming rib protruding from the inner surface of the upper and lower molds while approaching the upper and lower molds. By bringing the surfaces into contact with each other and reducing the pressure in the closed space to 1 / 13H or less of the internal pressure of the bladder (H is rib height mm) or less until the shoulder-side space of the contact portion is sealed by this contact, Departure To stop life.

[0007]

According to the method proposed by the above publication, when a mold is mounted on a dome type vulcanizer,
Before the vulcanizer is fully closed, the inside of the dome must be temporarily stopped to vacuum the dome, and it is necessary to provide a new sealing mechanism for all necessary vulcanizers. However, since the outer dimensions of the dome itself are extremely large, this type of sealing mechanism involves technical difficulties and requires a large capital investment when the number of vulcanizing machines is large. In addition, although vacuum of only a small space between the mold having the closed space and the unvulcanized tire is sufficient, vacuum must be performed over the entire large space inside the dome, and the vacuum efficiency is extremely poor.

In order to solve the above-mentioned problem, an attempt was made to provide a sealing mechanism for the container, assuming that a container which wraps a half-cut upper and lower die is used and the die contained in the container is applied to a dome type vulcanizer. . It has been found that the structure of this type of seal mechanism is simple and can achieve high accuracy, and that the purpose can be achieved in terms of eliminating spews and reducing the number of spews, but the cost of preparing containers further increases. Not a little, eventually, the cost of the mold rises, and in terms of performance, since a vacuum layer is formed between the container and the mold, the heat source in the dome, for example, the heat of steam is difficult to transfer to the mold. However, it was found that there was a problem with lack of reality that the vulcanization molding time had to be greatly extended.

Therefore, the inventions described in claims 1 and 2 of the present invention have a simple structure with a low degree of difficulty in the technology used, require very low investment costs, and have a high efficiency of vulcanization molding under high vulcanization molding efficiency. One of the purposes is to provide a mold for vulcanization molding of tires that does not require holes or requires only a small number of vent holes even if it is needed, and does not cause bear failure in vulcanized molded tires. According to the third to sixth aspects of the present invention, the dome-type vulcanizer currently in operation can be processed only by performing extremely simple processing. In the mold without vent hole, the trouble of clogging of vent hole and the occurrence rate of bear failure including help of clogging can be completely eliminated in the mold without vent hole. Vent hole It can block completely Bear failure in a mold having, for the purpose Part II to provide a vulcanization molding method for the tire.

[0010]

Means for Solving the Problems To achieve one of the above-mentioned objects, the invention described in claim 1 of the present invention is directed to a split-type upper and lower type tire vulcanizer which is detachably attached to a vertical dome type vulcanizer. In the mold for sulfur molding, one of the upper mold and the lower mold is a cylinder having a cylindrical inner peripheral surface that is fixed to the outer peripheral surface and protrudes from the outer peripheral mating surface of the mold. The other mold has an annular seal member slidably engageable with the inner peripheral surface of the cylinder on the outer periphery thereof, within a vertical and vertical movement distance of the upper dome relative to the lower dome of the vulcanizer. A seal mechanism in which the inner peripheral surface of the cylinder of one mold and the annular seal member of the other mold are engaged at the separated position of the upper and lower mold dome. Communicates from the outer peripheral mating surface to the outside of the mold through the outer peripheral part An exhaust system having an air hole and a seal joint at a terminal end portion of the exhaust hole, which removably receives a pipe joint sealingly fixed to a tip end of an exhaust tube extending from the outside of the vulcanizer, is provided. This is a vulcanization mold for tires.

The invention described in claim 1 is a mold that can be realized regardless of the presence or absence of a vent hole. Even if the number of the molds is small, the mold provided with the vent hole is similar to the invention described in claim 2. The upper mold and the lower mold have an inner mold that forms the outer shape of the tire, and an outer mold that fixes and houses the inner mold, and the inner mold has an inner surface and an outer surface. And a plurality of vent holes which communicate with all of the vent holes on the outer surface of the inner mold and extend to the mating surfaces of the upper and lower dies. In addition, on the inner surface of the upper and lower molds including the above inner mold,
Various patterns such as a tread pattern of a tire, characters, patterns, and other uneven portions for displaying a tire size, a tire type, a brand name, a name, and the like are formed.

In order to achieve the second object, the invention described in claim 3 of the present invention relates to a dome-type module having a function in which an upper dome moves vertically and vertically within a predetermined separation distance with respect to a lower dome. A vulcanization molding die, which is detachably attached to a vulcanizing machine, is loaded with an unvulcanized tire in a vulcanization molding die, and the vulcanization molding is performed by using the sealing mechanism and the exhaust system according to claim 1 or 2. The vulcanization molding die provided is attached to a vulcanizer, an unvulcanized tire is loaded into the lower die of the vulcanizer, and a seal joint of the exhaust system of the die and one end extending from the outside of the vulcanizer to a vacuum. Joint the pipe joint at the other end of the exhaust tube connected to the means, temporarily stop the upper dome while the upper dome descends vertically toward the lower dome,
During this stop, the vacuum means is operated, and the air between the inner surface of the mold and the outer surface of the unvulcanized tire is sucked and discharged to the outside of the vulcanizer. And the upper and lower molds are fully closed. Immediately after the fully closed, a pressurized body is acted on the inner surface of the unvulcanized tire by pressing the unvulcanized tire against the inner surface of the mold for a predetermined time. A vulcanization molding method for a tire, characterized in that after completion of shaping of the unvulcanized tire, a high-temperature gas is supplied into the dome of the vulcanizer, whereby the unvulcanized tire is vulcanized.

In practicing the third aspect of the present invention, preferably, the gap between the inner surface of the mold and the outer surface of the unvulcanized tire after decompression by the vacuum means, as in the fourth aspect of the invention. Is a low vacuum in the range of 1 to 20 Torr in the case of a mold having no vent hole,
20-100 Torr for mold with vent hole
It is a low vacuum state within the range of r.

According to another preferred embodiment, the temporary stop position in which the upper mold is vertically descending toward the lower mold dome is determined by setting the upper mold to the unvulcanized tire. And the position immediately before contact.

In another preferred embodiment, the air between the inner surface of the mold and the outer surface of the unvulcanized tire by the operation of the vacuum means is directed to the outside of the vulcanizer, according to the present invention. Discharge until the shaping of the unvulcanized tire is completed.
That is, there are two types of this air discharge operation,
The first type is a case where there are complicated intricate irregularities on the inner surface of the mold. In that case, the above-described air discharge mode is adopted, which is suitable for completely preventing occurrence of a bear failure.
In the second type, if there is a protrusion such as a rib with a relatively simple shape on the inner surface of the mold and complete air can be exhausted in a short time without requiring a long time, the inner surface of the mold The air discharge is completed before the press forming of the unvulcanized tire with respect to.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a left half cross-sectional view of a split-type vertical vulcanization mold for tire vulcanization molding in an air-exhausted state before fully closed. FIG. It is sectional drawing which illustrated the principal part of the sulfuring machine, and the mold accommodated in the upper and lower interiors simply.

In FIG. 1, a two-part top-to-bottom die for vulcanization molding (hereinafter referred to as a die) 1 is an upper die 2.
And a lower mold 3. The upper and lower molds 2, 3 are separated from each other by a vertical distance D (mm) with their respective central axes E coincident with each other. The upper mold 2 of the illustrated mold 1 has an inner mold 2a, and an outer mold 2b for accommodating and fixing the inner mold 2 with bolts 4 and the like. The lower mold 3 also has an inner mold. 3
a, and an outer mold 3b for accommodating and fixing this with a bolt 4 or the like. All shaping on tires is inside mold 2
This is performed on the inner surfaces of a and 2b.

One of the upper and lower molds 2, 3;
In the illustrated example, the lower mold 3 is a cylinder 5 fixed to the outer peripheral surface thereof.
Is provided. It is preferable that the cylinder 5 protrudes upward from the outer peripheral surface 5s of the lower mold 3 and the protruding tip is tapered to prevent galling. Further, at least the inner peripheral surface of the cylinder 5 above the outer peripheral mating surface 5s needs to be a cylindrical inner surface capable of maintaining a complete sealing state in cooperation with an annular sealing member described later. Although the illustrated cylinder 5 is separately attached to the existing lower mold 3, when newly manufactured, it is advantageous to integrally form the outer mold 3 b.

The other one of the upper and lower molds 2, 3;
In the illustrated example, the upper mold 2 has an annular seal member 6 on its outer periphery. The annular seal member 6 can be slidably engaged with the inner peripheral surface of the cylinder 5 at the positions of the upper and lower mold dies 2 and 3 as shown. It is preferable to bury the upper mold 2 inside the dovetail groove in order to prevent it from falling off due to the sliding. Although the annular sealing member 6 may be a heat-resistant O-ring, it can perform a sufficient sealing function regardless of this.
In addition, any material having heat resistance that can withstand a high temperature at the time of vulcanization molding, for example, 180 to 200 ° C. for a sufficient period, such as a fluororesin, is suitable.

The separation distance D between the upper and lower dies 2 and 3 for operating a sealing mechanism by cooperation of the cylinder 5 and the annular sealing member 6.
Is within the vertical vertical movement distance of the upper dome with respect to the lower dome of the dome type vulcanizer to which the mold 1 is attached, and must not be zero.

An exhaust hole 7 extending downward from the outer peripheral mating surface 5s of the lower mold 3 to near the lower end portion is formed, and a horizontal hole is provided so as to be orthogonal to the exhaust hole 7, and a taper pipe screw is formed in the horizontal hole. And a female or male seal joint 8
To join. A pipe joint at the tip of an exhaust tube extending from a dome-type vulcanizer described later is connected to the seal joint 8.

In FIG. 1, for convenience of explanation, both a mold type having a vent hole 9 and a mold type having no vent hole are shown in the same figure, but actually, the equatorial plane of the tire is shown. Except for a special case where the pattern is significantly complicated on both sides of the tread portion to be sandwiched, the mold 1 is provided with the vent hole 9 and the mold 1 is not provided at all.

When the vent hole 9 is provided (the upper mold 2
As shown in the figure, the upper mold 2 is composed of an inner mold 2a and an outer mold 2b which is fixedly accommodated by bolts 4 or the like.
The minimum required through vent hole 9 is provided only in the inner mold 2a. Further, vent grooves 10 and 11 which connect these vent holes 9 vertically and horizontally on the outer surface of the inner mold 2a are provided, and one of the vent grooves 10 and 11, in the illustrated example, the vent groove 10 is fitted to the outer peripheral surface of the upper and lower molds. Open for 5 s. The same applies to the lower mold 3.

Numerals 12 and 13 shown in FIG. 1 are bead rings according to a conventional method for forming a bead portion of a tire.
Therefore, the seal member mounting groove is formed only in the conventional ring, and reference numeral 14 denotes a seal member for maintaining a degree of vacuum by evacuation described later.

Since the mold 1 described above does not have a particularly complicated structure and is a simple structure that can be manufactured in a factory, it is possible to obtain the mold 1 without much increase in cost. Can be. The cost of remodeling is sufficiently commensurate with the reduction in processing cost of the vent hole 9, and the cost of newly manufacturing the mold 1 is rather lower.

Referring to FIG. 2, a dome-type vulcanizer (hereinafter referred to as a vulcanizer) 20 to which the above-described mold 1 is detachably attached, and its operation will be described. Vulcanizer 20
Is divided into an upper dome 21 and a lower dome 22, the lower dome 22 is fixed to the floor, the upper dome 21 opens and closes up and down, and the completely closed state of the lower dome 22 is in operation. At the beginning of the opening / closing operation of the upper dome 21, the upper dome 21 vertically moves vertically along a central axis of the upper and lower domes 21 and 22 for a predetermined separation distance, and the upper dome 21 excluding the vertical movement portion is removed.
Moves in a curved motion as if it follows an arc-shaped curve, and takes a stop position (not shown) obliquely above the lower mold dome 22.

Since a fluid of a high-pressure heating source for heating the mold 1 and the unvulcanized tire housed therein, for example, high-temperature and high-pressure steam, is supplied to the inner space of the upper and lower dome 21, 22.
Packings 23 and 24 as sealing members also serving as heat insulation are fixed to the contact surfaces where the upper and lower dome 21 and 22 are engaged. Main bodies 21-1 and 22 of upper and lower domes 21 and 22
-1 are made of steel and most of their outer perimeter is covered with thick insulation 25.

The mold 1 will now be described with reference to FIGS.
The upper mold 2 is detachably attached to the upper dome 21, and the lower mold 3 is detachably attached to the lower dome 22. Prior to mounting the lower mold 3, a pipe joint fixed to the end of an exhaust tube extending from the lower mold dome 22 is connected to the female or male seal joint 8 of the lower mold 3.

Prior to the operation of the vulcanizer 20, an unvulcanized tire (not shown) is loaded into the lower die 3 and then the upper dome 2
1 starts descending, and the vulcanizer 20 enters the operating state. The upper dome 21 continues to descend toward the lower dome 22, and the upper dome 21 changes from a curved motion to a vertical lowering motion with respect to the lower dome 22, and the distance d between the packings 23 and 24 is predetermined. , The upper dome 21 is temporarily stopped.

The temporary stop position is determined by the distance D between the upper and lower dies 2 and 3 ≒ the distance d between the packings 23 and 24 d = 10.
１００100 mm, so that the mold 1
The seal mechanism works in cooperation with the cylinder 5 and the annular seal member 6 provided in the above, so that the space between the outer surface of the unvulcanized tire and the inner surface of the mold 1 forms a completely closed space. Since a pressurized body by a conventional pressurized fluid (not shown), for example, a rubber bladder, is inserted into the unvulcanized tire after being expanded to a certain extent, the outer surface of the bead portion of the unvulcanized tire is completely closed. Have been. Further, it is preferable that the temporary stop position is a position immediately before the upper mold 2 is in contact with the unvulcanized tire or not.
It is assumed that the distance d between the four is determined.

During this temporary stop, the vacuum means is operated via an exhaust tube 26 connected to vacuum means (not shown) to close the outer surface of the unvulcanized tire and the inner surface of the mold 1. The air existing in the space is sucked, and the sucked air is discharged outside the vulcanizer 20 in the direction of arrow V.
As a result, the closed space is in a low vacuum state within the range of 1 to 20 Torr in the case of the mold 1 having no vent hole 9, and in the case of the mold 1 having the vent hole 9, 20 to 20 Torr.
A low vacuum state within a range of 100 Torr is set. The vacuum means may be, for example, a vacuum pump itself or a relatively large vacuum tank connected to a vacuum pump, which is common to several vulcanizers 20.

After the elapse of time during which the suction and discharge of the air in the closed space falls within the range of the above-mentioned degree of vacuum, the upper and lower dome 21,
22, the upper and lower molds 2, 3 are also fully closed,
At the same time as the fully closed state, a pressurizing body, for example, a rubber bladder supplied with a pressurized fluid having a predetermined pressure is applied to the inner surface of the unvulcanized tire to apply a rib or a convex portion, a concave portion, and a smooth portion provided on the inner surface of the mold 1. Unvulcanized tire for a predetermined time, for example, for 2 to 10 minutes,
The shaping is performed by contact pressing. At this time, since only a very small amount of air exists between the inner surface of the mold 1 and the outer surface of the unvulcanized tire, there is no possibility that the air is trapped, and no bear failure occurs. The appropriate internal pressure for shaping the pressurized body is in the range of 5 to 30 kgf / cm ² .

If it is unavoidable that the closed space is inevitably partitioned at a plurality of locations, or if it occasionally occurs, the closed space is limited to only the required locations as illustrated in the upper mold 2 of FIG. Vent hole 9 and vent grooves 10, 11
Is provided, the occurrence of a bear failure can be completely prevented. In this case, it is necessary to form an air flow in the vent hole 9 and the vent grooves 10 and 11 even during shaping of the unvulcanized tire, so that the air suction and exhaust by the vacuum means is continued during shaping. Shall be implemented.

Simultaneously with the completion of shaping of the unvulcanized tire, a valve provided in the exhaust tube 26 connected to the vacuum means, for example, an electromagnetic valve (not shown) is closed to stop the operation of the vacuum means, and the mold 1 The air discharging operation between the inner surface of the tire and the outer surface of the unvulcanized tire is stopped. At the same time as the stop of the air discharging operation, the dome 21, 2
2, a high-temperature gas in the direction of arrow S via a supply pipe 27,
For example, high-temperature steam is supplied to vulcanize an unvulcanized tire. The steam pressure is in the range of 3 to 10 kgf / cm ² , and the steam temperature is in the range of 100 to 200 ° C.

A mold 1 and a vulcanizer 2 to which the mold 1 is attached
0 and the vulcanization molding method described above is used, the mold 1
Since the closed space formed between the inner surface of the tire and the outer surface of the unvulcanized tire is only a very small volume space, the exhaust efficiency is high and the degree of vacuum in the closed space can be increased. The time required is extremely short, and the spew does not exist at all, or the number of spews, if any, is very limited, without significantly impairing the productivity of the vulcanization molding process. Thus, the occurrence of a bear failure can be completely prevented, and the failure rate due to the bear can be significantly reduced, and the appearance of the tire can be achieved.

In particular, in the case of a tire using a foamed rubber as the outer rubber of the tread rubber of the tire, for example, a tire for an agricultural machine, the foamed rubber at a high temperature immediately after vulcanization molding has a low tensile strength and is taken out of the mold. At this time, the spew is cut off in the middle, and the remaining spew portion stops inside the vent hole and causes clogging. Therefore, there are many vent holes that do not serve as an air escape during the subsequent tire vulcanization molding, so that troubles in which bears occur in many places per tire frequently occur. According to the vulcanization molding method described above using the vulcanizer 20 to which the mold 1 is attached, this kind of trouble can be eradicated.

Further, not only the mold 1 but also the vulcanizer 20 does not need to be subjected to a large-scale processing or to add new equipment or expensive parts. Sufficiently, it is only necessary to attach the exhaust tube 26 and the joint connected to the vacuum means. Since the exhaust efficiency is extremely high even in the case of the vacuum means, there is a great advantage that an extremely small investment is required as a whole.

[0038]

According to the invention described in claim 1 or 2 of the present invention, it has a simple structure that does not require any special advanced technology, requires very low investment cost, and has high vulcanization molding efficiency. Provided a vulcanization mold for tires that does not require a vent hole or requires only a small number of vent holes even if required, and does not cause bear failure in the vulcanized molded tire According to the invention described in claims 3 to 6 of the present invention, even in the currently operating dome-type vulcanizer, the vulcanizer in which only simple processing is performed is stopped. By mounting the mold according to claims 1 and 2, even if the mold does not have a vent hole, the occurrence of a bear failure can be prevented, and further, the trouble of clogging of the spew inside the vent hole is released, and the complexity is reduced. Such as projections Also reduces the number of significantly vent hole compared to the conventional even when a mold having the inner surface can block completely Bear failure, it is possible to provide a vulcanization molding method for the tire.

[Brief description of the drawings]

FIG. 1 is a left half sectional view of a mold according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a dome-type vulcanizer according to an embodiment of the present invention, in which the mold shown in FIG. 1 is accommodated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Split-up / down type tire vulcanization mold 2 Upper die 2a Inner die 2b Outer die 3 Lower die 3a Inner die 3b Outer die 4 Bolt 5 Cylinder 5s Upper / lower die alignment Surface 6 Annular seal member 7 Exhaust hole 8 Seal joint 9 Vent hole 10, 11 Vent groove 12, 13 Bead ring 14 Seal member 20 Dome type vulcanizer 21 Upper dome 21-1 Upper dome main body 22 Lower dome 22- Reference Signs List 1 Lower dome main body 23, 24 Packing 25 Insulation material 26 Exhaust tube 27 Hot gas supply pipe D Vertical separation distance between upper and lower molds d Distance between upper and lower packing

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29K 105: 24 B29L 30:00

Claims (6)

[Claims] Claims: 1. A split vulcanizing mold for tire vulcanization which is detachably mounted on an upper and lower dome type vulcanizer, wherein one of an upper die and a lower die is the same. An annular cylinder fixed to the outer peripheral surface and having a cylindrical inner peripheral surface protruding from an outer peripheral mating surface of the mold, and the other mold having an outer peripheral surface slidably engageable with the inner peripheral surface of the cylinder; A seal member is provided, and at an upper and lower dome separation position within a vertical and vertical movement distance of the upper dome with respect to the lower dome of the vulcanizer, the inner peripheral surface of the cylinder of one mold and the other An exhaust hole that is provided with a seal mechanism that engages with the annular seal member, and that communicates from the outer peripheral portion mating surface of one of the upper and lower mold dies to the outside of the mold through the inside of the outer peripheral portion; At the end, seal to the end of the exhaust tube extending from the outside of the vulcanizer. A vulcanization mold for a tire, comprising: an exhaust system having a seal joint for removably receiving a pipe joint fixed thereto. 2. The upper mold and the lower mold have an inner mold that forms the outer shape of the tire, and an outer mold that fixes and accommodates the inner mold. 2. The method according to claim 1, further comprising: a plurality of vent holes communicating with the inner surface and the outer surface; and a vent groove communicating with all of the vent holes on the outer surface of the inner mold and extending to a mating surface of the upper and lower molds. The mold described. 3. A vulcanizing mold of a two-part type, which is detachably mounted on a dome-type vulcanizer having a function of vertically moving an upper dome vertically within a predetermined separation distance with respect to a lower dome. A vulcanizing mold having the seal mechanism and the exhaust system according to claim 1 or 2 is attached to a vulcanizing machine when an unvulcanized tire is loaded and vulcanized and molded. A mold is loaded with an unvulcanized tire, and a seal joint of the exhaust system of the mold and a pipe joint at the other end of an exhaust tube extending from the outside of the vulcanizer and having one end connected to a vacuum means are joined together. The upper mold dome is temporarily stopped toward the dome while the upper mold dome is vertically descending, and during this stop, the vacuum means is operated to release air between the inner surface of the mold and the outer surface of the unvulcanized tire. Suction and discharge to the outside of the vulcanizer. After passing through the space, the upper and lower dome and the upper and lower molds are fully closed, and immediately after this fully closed, a pressurized body by a pressurized fluid is applied to the inner surface of the unvulcanized tire to apply the unvulcanized tire to the inner surface of the mold. After the shaping of the unvulcanized tire is completed for a predetermined time, high-temperature gas is supplied to the inside of the dome of the vulcanizer after the shaping of the unvulcanized tire, whereby the unvulcanized tire is vulcanized and molded. Sulfur molding method. 4. A low vacuum state within a range of 1 to 20 Torr when a space between the inner surface of the mold and the outer surface of the uncured tire after decompression by the vacuum means is a mold having no vent hole. The vulcanization molding method according to claim 3, wherein the mold having a vent hole is in a low vacuum state within a range of 20 to 100 Torr. 5. The crimping device according to claim 3, wherein the temporary stop position in which the upper mold dome vertically descends toward the lower mold dome is a position immediately before the upper mold contacts the unvulcanized tire. Sulfur molding method. 6. The discharge of air between the inner surface of the mold and the outer surface of the unvulcanized tire to the outside of the vulcanizer by the operation of the vacuum means is continued until the shaping of the unvulcanized tire is completed.
5. The vulcanization molding method described in any one of items 5 to 5.