KR102437973B1 - Tire curing mold and manufacturing method therefor - Google Patents

Abstract

According to an embodiment of the present invention, there is provided an upper mold in contact with the upper hot plate and to which heat generated from the upper hot plate is transferred; a lower mold in contact with the lower hot plate to transfer heat generated from the lower hot plate; and a core mold that transfers heat to the inside of the bladder to be vulcanized and determines the inner shape of the bladder, wherein on the inner peripheral surface of the upper mold, a center portion, a middle portion, There is provided a tire vulcanization mold, characterized in that a shoulder portion is sequentially formed, and at least one first vent hole is formed in an acute angle vertex area in each of the center portion, the middle portion, and the shoulder portion.

Description

Tire curing mold and manufacturing method therefor

Embodiments of the present invention relate to a tire vulcanization mold and a method for manufacturing the same.

In general, the vulcanization process is a process in which the green tire completed in the forming process is inserted between the outer mold and the bladder of the tire vulcanizer, and heat and pressure steam are applied from the inside and the outside to elapse for a certain period of time. Through this process, the green tire reacts with the vulcanizing agent added during the compounding process to completely combine the sulfur and rubber molecules in the tire to obtain stable intrinsic properties. is formed The heat sources in this vulcanization process are an internal heat source supplied to the inside of the curing bladder and an external heat source supplied from the outside of the vulcanization mold, and the green tire is vulcanized by these heat sources.

SUMMARY Embodiments of the present invention provide a tire vulcanization mold capable of reducing tire manufacturing and processing costs by forming a minimum vent hole at an optimized position according to a predetermined rule, and a manufacturing method thereof.

According to an embodiment of the present invention, there is provided an upper mold in contact with an upper hot plate and to which heat generated from the upper hot plate is transferred; a lower mold in contact with the lower hot plate to transfer heat generated from the lower hot plate; and a core mold that transfers heat to the inside of the bladder to be vulcanized and determines the inner shape of the bladder, wherein on the inner peripheral surface of the upper mold, a center portion, a middle portion, There is provided a tire vulcanization mold, characterized in that a shoulder portion is sequentially formed, and at least one first vent hole is formed in an acute angle vertex area in each of the center portion, the middle portion, and the shoulder portion.

In one embodiment of the present invention, one or more second vent holes may be formed in a center line of the center portion.

In an embodiment of the present invention, when a groove is formed on the center line, a second vent hole may be formed in an area offset from the center line to a certain extent.

In one embodiment of the present invention, in each region of the center part, the middle part, and the shoulder part, two or more vent holes may be formed in a region in contact with a groove dividing each region.

In one embodiment of the present invention, the shortest distance from the center of the first vent hole to the corners of each region of the center part, the middle part, and the shoulder part may be 1 mm or more and 5 mm or less.

An embodiment of the present invention according to another aspect is a method for manufacturing a tire vulcanization mold including an upper mold, a lower mold, and a core mold, on the inner circumferential surface of the upper mold, from the center line of the tire in the outward direction, a center portion, a middle a step in which a portion and a shoulder portion are formed; It provides a method of manufacturing a tire vulcanization mold including; forming at least one first vent hole in the acute angle vertex region in each region of the center part, the middle part, and the shoulder part.

In one embodiment of the present invention, forming one or more second vent holes in the center line of the center portion (center portion); may further include.

In an embodiment of the present invention, when a groove is formed on the center line, a second vent hole may be formed in an area offset from the center line to a certain extent.

In one embodiment of the present invention, in each region of the center part, the middle part, and the shoulder part, the step of forming two or more vent holes in a region in contact with a groove dividing each region; may further include have.

In one embodiment of the present invention, the shortest distance from the center of the first vent hole to the corners of each region of the center part, the middle part, and the shoulder part may be 1 mm or more and 5 mm or less.

Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

The tire vulcanization mold and the method for manufacturing the same according to embodiments of the present invention form the minimum vent hole at an optimized position according to a predetermined rule, thereby reducing tire manufacturing and processing costs.

1 is a perspective view schematically illustrating a tire.
2 is a diagram schematically illustrating a tire vulcanization mold according to an embodiment of the present invention.
3 is a cross-sectional view of an inner surface forming a tread in contact with a tire in the upper mold of the tire vulcanization mold of FIG. 2 .
FIG. 4 is a plan view of an inner surface forming a tread in contact with a tire in an upper mold of the tire vulcanization mold of FIG. 2 .
FIG. 5 is an enlarged view of part A of FIG. 4 .
FIG. 6 is an enlarged view of part B of FIG. 4 .

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. Effects and features of the present invention, and a method for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when described with reference to the drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. .

In the following embodiments, terms such as first, second, etc. are used for the purpose of distinguishing one component from another, not in a limiting sense.

In the following examples, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have means that the features or components described in the specification are present, and the possibility that one or more other features or components may be added is not excluded in advance.

In the drawings, the size of the components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the illustrated bar.

Hereinafter, a tire vulcanization mold 100 according to an embodiment of the present invention will be described with reference to the drawings.

1 is a perspective view schematically illustrating a tire.

In general, the tires constituting the wheel share and support the entire weight of the vehicle together with the wheel, and the torque during driving and braking, the impact from the road surface, the centrifugal and centripetal forces during turning, and the lateral force generated when the vehicle is tilted, etc. It is made to be durable enough. In particular, a tire is inserted into the rim of a wheel, rotates integrally, absorbs an impact from the road surface, and contacts the road surface to enable driving or braking of the vehicle.

Referring to FIG. 1 again, the tire 10 may include a tread portion 11 and a sidewall portion 12 extending from both sides of the tread portion 11 . Also, although not shown, the tire 10 includes a bead portion, a bead apex, and a reinforcing layer provided at an end of the sidewall portion 12 , and includes a tread portion 11 and a pair of sidewall portions 12 . An inner liner positioned inside the tire 10 to maintain the internal air pressure of the tire 10 may be included. In addition, the tire 10 may include a belt layer and a carcass layer positioned under the tread unit 11 , and a cap ply may further be included between the tread unit and the belt layer.

The tread 11 is made of a thick rubber layer and transmits the driving force and braking force of the vehicle to the ground. Tread patterns 14 and blocks 16 partitioned by the tread patterns 14 for handling safety, traction, and braking performance may be positioned on the surface of the tread unit 11 . The tread patterns 14 may include a plurality of grooves for drainage when driving on a wet road surface and sipes for improving traction and braking force. The groove may include a circumferential groove coincident with the direction of travel of the vehicle and a transverse groove between the circumferential groove. The sipe is formed in the block, and may be a groove having a size smaller than that of the groove. The sipe serves to break the water film by absorbing moisture when driving on a wet road surface, thereby increasing the driving force and braking force of the tire 10 . The blocks 16 are regions occupying most of the tread portion 11, and are in direct contact with the ground to transmit the driving force and braking force of the vehicle to the ground.

The sidewall part 12 is disposed extending downwardly from the end of the tread part 11 . The sidewall part 12 is a side part of the tire 10 , and may protect the carcass layer, provide lateral stability of the tire 10 , and increase riding comfort by performing a flexing/extending motion. In addition, the sidewall part 12 serves to transmit the torque of the engine received through the drive shaft to the tread part 11 .

2 is a diagram schematically illustrating a tire vulcanization mold 100 according to an embodiment of the present invention.

Referring to FIG. 2 , the tire vulcanization mold 100 according to an embodiment of the present invention may include an upper mold 110 , a lower mold 120 , a core mold 130 , and a space 140 .

The upper mold 110 may be in contact with the upper hot plate so that heat generated from the upper hot plate may be transferred. The lower mold 120 may be in contact with the lower hot plate so that heat generated from the lower hot plate may be transferred. The upper mold 110 and the lower mold 120 are combined to transfer heat to the outside of the bladder to be vulcanized, and can determine the outer shape of the bladder. The core mold 130 may transfer heat to the inside of the bladder to be vulcanized and determine the inner shape of the bladder.

The space 140 may be a forming space of the bladder to be vulcanized defined by the upper mold 110 , the lower mold 120 , and the core mold 130 .

In the bladder, a certain amount of rubber, which is a material of the bladder to be vulcanized, is disposed in the space 140, and then the rubber is heated and compressed by the upper mold 110, the lower mold 120, and the core mold 130. It may be formed by flowing through the space 140 .

At this time, a vent portion (see 116 , 117 , 118 of FIG. 5 , etc.) for discharging air in the space 140 may be formed on the inner circumferential surface 115 of the upper mold 110 of the tire vulcanization mold 100 . These vents (see 116 , 117 , 118 of FIG. 5 , etc.) discharge air generated in the process of forming the bladder to the outside, thereby generating a flow of rubber disposed inside the space 140 . One feature of the tire vulcanization mold 100 according to an embodiment of the present invention is to optimize the formation position and arrangement of such vents (see 116, 117, 118, etc. in FIG. 5) to facilitate the flow of rubber. In the following, this will be described in more detail.

3 is a cross-sectional view of the inner surface forming a tread in contact with the bladder in the upper mold 110 of the tire vulcanization mold 100 of FIG. 2 , and FIG. 4 is the upper mold 110 of the tire vulcanization mold 100 of FIG. 2 . ) is a plan view of the inner surface forming a tread in contact with the bladder. FIG. 5 is an enlarged view of part A of FIG. 4 , and FIG. 6 is an enlarged view of part B of FIG. 4 .

3 and 4 , the upper mold 110 of the tire vulcanization mold 100 has a center portion 111 , a middle portion 112 , and a shoulder portion 113 . ), and a decoration portion 114 . Here, the center portion 111 is a region corresponding to the most central portion of the tread portion (refer to 11 of FIG. 1 ) in contact with the road surface. A middle portion 112 is a region formed between a center portion 111 and a shoulder portion 113 . The shoulder portion 113 is an area corresponding to the edge of the tread portion (see 11 in FIG. 1), and the decoration portion 114 is an area corresponding to the sidewall portion (see 12 in FIG. 1). can be

A center portion 111 , a middle portion 112 , a shoulder portion 113 , and a decoration portion 114 are each divided into a plurality of regions (or blocks). and the plurality of regions (or blocks) may be repeatedly arranged along the outer circumferential surface of the tire. The interior of each of these regions may be formed as a concave portion, and a boundary portion of each region may be formed as a convex portion, and these convex portions may be formed to correspond to the tread of the tire.

Here, a plurality of vent holes 116, 117 and 118 are formed in the center portion 111, the middle portion 112, and the shoulder portion 113, respectively. , At the time of vulcanization molding, the air in the center part 111, middle part 112, and shoulder part 113 is exhausted, and the rubber in the center part 111, middle part 112, and shoulder part 113 is smoothed out. It is configured to flow and prevent the generation of air bubbles.

In detail, in the prior art, since a clear design method has not been proposed for processing such a vent hole, an increase in processing cost due to excessive vent hole processing occurs, and there is a problem in that a lot of time is wasted in cleaning the mold. In addition, excessive design of the vent hole causes an increase in rubber leaking into the vent hole, thereby increasing the tire manufacturing cost.

In order to solve such a problem, the tire vulcanization mold 100 according to an embodiment of the present invention provides an optimized design method for a tire tread vent hole, thereby reducing tire manufacturing and processing costs through optimal vent hole application. characterized in that Hereinafter, this will be described in detail.

First, a vent hole formed to facilitate the flow of rubber on an open surface rather than a vertex of each region may be defined as an open vent hole.

On the other hand, a vent hole formed to facilitate a rubber flow for realizing the shape of a block in a closed section or a vertex section of each region may be defined as a vertex vent hole.

The position of the vent hole formed in the upper mold 110 of the tire vulcanization mold 100 may be determined by sequentially applying the following rules.

First, a vertex vent hole may be disposed in an acute angle vertex region in each region. For example, as shown in FIG. 5 , first vent holes 116 , which are vertex vent holes, may be formed in an acute angle vertex region of the center portion 111 . As another example, as shown in FIG. 6 , first vent holes 116 , which are vertex vent holes, may be formed in an acute angle vertex region of the middle portion 112 .

Second, an open vent hole may be disposed in the center line CL, which is the center of the center portion 111 . In this case, one open vent hole may be disposed in a single type for each pitch type, and two vent holes may be disposed in a dual type. Meanwhile, in this case, when the vent hole cannot be formed because a groove is formed on the center line CL, the vent hole may be formed in a region offset to a certain extent from the center line CL.

That is, as shown in FIG. 5 , a second vent hole 116a that is at least one open vent hole may be formed on the center line CL of the center part 111 . At this time, when a predetermined partition wall 119 is formed on the center line CL, the second vent hole 116b, which is an open vent hole, is located in an area offset from the center line CL to a certain extent. ) can be formed.

Third, an open vent hole may not be disposed in the middle portion 112 . That is, as shown in FIG. 6 , only the first vent holes 116 that are vertex vent holes are formed in the middle portion 112 , and no open vent holes are formed. . However, even in the middle part 112 , the partition wall 119 shown in FIG. 5 may exist. In this case, an open vent hole may be applied adjacent to the partition wall 119 .

Fourth, at least two vent holes may be formed at an edge of the tread portion (refer to 11 of FIG. 1 ) in contact with the groove. Here, the groove may mean a groove formed between the center part 111 , the middle part 112 , and the shoulder part 113 to partition each area.

That is, as shown in FIG. 5 , only one first vent hole 116 is formed on the left side of the center portion 111 , which is an edge contacting the groove. In this case, in order to facilitate the flow of rubber, a third vent hole 118 that is a vertex vent hole may be further formed.

In detail, the acute-angled vertex region in each region should be formed so that the shape of the pattern can be well implemented. Therefore, by arranging a vent hole, which is an outlet for air, in such an acute angle area, the flow of rubber is smoothed so that its shape is well realized. Since there is no need to implement a distinct shape in the center portion, a sufficient flow of rubber can be generated even if only one vent hole is disposed for a minimum flow. On the other hand, since there is also a section where the lateral groove and the vertical groove meet due to the shape of the corner in the groove, at least two vent holes are required.

On the other hand, there is a predetermined correlation between the diameter of each vent hole 116, 117, 118 and the shortest distance L from the center of each vent hole 116, 117, 118 to the edge of each area. exist. And when considering such a correlation, the shortest distance L from the center of each vent hole 116 , 117 , 118 to the edge of each region may be 1 mm or more and 5 mm or less.

In detail, the smaller the diameter of each vent hole 116, 117, 118, the closer the distance from the center of each vent hole 116, 117, 118 to the edge of each area. Conversely, as the diameter of each vent hole 116 , 117 , and 118 increases, the distance from the center of each vent hole 116 , 117 , 118 to the edge of each region may increase. This is because the size of the diameter of each of the vent holes 116, 117, and 118 is proportional to the flow of rubber. When comprehensively considering the size of the diameter of each vent hole 116 , 117 , 118 , the flow of rubber, and the difficulty in the manufacturing process, each area from the center of each vent hole 116 , 117 , 118 . The shortest distance (L) to the edge of may be 1 mm or more and 5 mm or less.

In the tire vulcanization mold according to the embodiments of the present invention, a minimum vent hole is formed at an optimized position according to a predetermined rule, thereby reducing tire manufacturing and processing costs.

Hereinafter, a method of manufacturing a tire vulcanization mold according to an embodiment of the present invention will be described.

In the method for manufacturing a tire vulcanization mold according to an embodiment of the present invention, the method of manufacturing a tire vulcanization mold including an upper mold, a lower mold, and a core mold, on the inner circumferential surface of the upper mold 110, from the center line of the tire A step in which the center part 111, the middle part 112, and the shoulder part 113 are formed while going outward, and acute angles in each area of the center part 111, the middle part 112, and the shoulder part 113 and forming one or more first vent holes 116 in a vertex region of .

Furthermore, the method of manufacturing a tire vulcanization mold according to an embodiment of the present invention further includes the step of forming one or more second vent holes 117 in a center line of the center portion 111 . may include

In this case, when the groove is formed on the center line, the second vent hole 117 may be formed in an area offset from the center line to a certain extent.

Furthermore, in the method of manufacturing a tire vulcanization mold according to an embodiment of the present invention, in each region of the center part 111 , the middle part 112 , and the shoulder part 113 , a groove dividing each region and The method may further include forming two or more vent holes in the contact area.

As described above, by forming the minimum vent hole at an optimized position according to a predetermined rule by the manufacturing method of the tire vulcanization mold according to the embodiments of the present invention, it is possible to obtain the effect of reducing the tire manufacturing and processing cost.

As such, the present invention has been described with reference to one embodiment shown in the drawings, but this is merely exemplary, and those skilled in the art will understand that various modifications and variations of the embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

100: tire vulcanization mold
110: upper mold
120: lower mold
130: core mold
140: space part
111: center portion (center portion)
112: middle portion (middle portion)
113: shoulder portion (shoulder portion)
116, 117, 118: vent hole

Claims (10)

an upper mold in contact with the upper hot plate to transfer heat generated from the upper hot plate;
a lower mold in contact with the lower hot plate to transfer heat generated from the lower hot plate; and
A core mold that transfers heat to the inside of the bladder to be vulcanized and determines the inner shape of the bladder;
On the inner circumferential surface of the upper mold, a center portion, a middle portion, and a shoulder portion are sequentially formed from the center line of the tire in an outward direction,
At least one first vent hole is formed in an acute angle vertex region in each region of the center part, the middle part, and the shoulder part;
In each area of the center part, the middle part, and the shoulder part, two or more vent holes are formed in an area in contact with a groove dividing each area,
The distance from the center of the first vent hole to the corners of each region of the center part, the middle part, and the shoulder part is proportional to the diameter of the first vent hole,
The shortest distance from the center of the first vent hole to the corners of each area of the center part, the middle part, and the shoulder part is 1 mm or more and 5 mm or less,
One or more second vent holes are formed in a center line of the center portion,
Tire vulcanization mold, characterized in that only the first vent hole is formed in the middle portion.
delete The method of claim 1,
When a groove is formed on the center line, a second vent hole is formed in an area offset from the center line to a certain extent. delete delete A method for manufacturing a tire vulcanization mold comprising an upper mold, a lower mold, and a core mold, the method comprising:
forming a center portion, a middle portion, and a shoulder portion on the inner circumferential surface of the upper mold while going outward from the center line of the tire;
forming at least one first vent hole in an acute angle vertex region in each region of the center part, the middle part, and the shoulder part;
forming two or more vent holes in a region in contact with a groove dividing each region in each region of the center part, the middle part, and the shoulder part; and
Including; forming one or more second vent holes in a center line of the center portion;
The distance from the center of the first vent hole to the corners of each region of the center part, the middle part, and the shoulder part is proportional to the diameter of the first vent hole,
The shortest distance from the center of the first vent hole to the corners of each area of the center part, the middle part, and the shoulder part is 1 mm or more and 5 mm or less,
A method of manufacturing a tire vulcanization mold in which only the first vent hole is formed in the middle portion.
7. The method of claim 6,
The method of manufacturing a tire vulcanization mold further comprising; forming one or more second vent holes in a center line of the center portion. 8. The method of claim 7,
When a groove is formed on the center line, a second vent hole is formed in an area offset from the center line to a certain extent.

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