KR101178160B1 - Curing mold for tire, method for manufacturing curing mold, and pneumatic tire manufactured by the curing mold - Google Patents

Abstract

The present invention relates to a tire vulcanization mold, a tire vulcanization mold manufacturing method, and a pneumatic tire manufactured using the same, by forming a fine knurled groove through an etching process on the vulcanization surface of the side plate mold corresponding to the sidewall of the tire. In the vulcanization process, fine knurled protrusions corresponding to the knurled grooves are formed on the outer surface of the tire to improve the fouling resistance of the side wall of the tire. A plurality of knurled protrusions forming a mountain in a direction crossing each other are formed on the two knurled surfaces which are partitioned continuously in all directions in a predetermined pattern and are adjacent to each other, thereby improving the appearance of the tire.

Description

Vulcanization mold and manufacturing method for tire and pneumatic tire manufactured using same {CURING MOLD FOR TIRE, METHOD FOR MANUFACTURING CURING MOLD, AND PNEUMATIC TIRE MANUFACTURED BY THE CURING MOLD}

The present invention relates to a tire vulcanization mold, a tire vulcanization mold manufacturing method, and a pneumatic tire manufactured using the same, and more particularly, to form a fine knurled protrusion on the outer surface of the sidewall of the pneumatic tire to improve the appearance of the tire. The present invention relates to a vulcanization mold for a tire, a vulcanization mold for a tire, and a pneumatic tire manufactured using the same.

As is well known, tires are a refining process in which raw materials, ie natural rubber, synthetic rubber and chemicals, are mixed to produce compounds with specific physical properties, extrusion / rolling / cutting processes to make these compounds semi-finished in a sheet form, and semi-finished products. They are manufactured through a molding process for making green tires by molding them, and a vulcanization process for making finished tires by vulcanizing the green tires.

In the conventional pneumatic tire manufactured through the above process, the shoulder part, the side wall part, and the bead part are sequentially formed on both sides of the tread part in contact with the ground on the cross section along the width direction of the tire, and the air is filled with a predetermined pressure therein. It is formed to have a space.

 The sidewall part of the conventional tire is a place where a lot of visually appears when the tire is mounted on a vehicle. Many efforts have been made to express various personalities by giving a visual and decorative effect to the exterior of a simple tire.

However, the sidewall portion of the conventional pneumatic tire has a disadvantage in that the service life of the tire is long and is easily contaminated by external muddy water, rainwater, pollutants, dust, and the like, thereby deteriorating appearance quality.

An object of the present invention for solving the above problems is, by forming a fine knurled protrusion on the outer surface of the side wall portion of the tire, improves the appearance of the tire, and easy to clean and increase the stain resistance for tires, It is to provide a manufacturing method of a vulcanization mold for a tire and a pneumatic tire manufactured using the same.

According to the vulcanization mold for tires of the present invention for achieving the above object, in the vulcanization mold for vulcanizing the molded green case into the shape of the finished tire, the surface of the vulcanization mold has a predetermined knurled surface having a predetermined pattern The two knurled surfaces which are partitioned continuously in four directions and are adjacent to each other are provided with a plurality of knurled grooves forming a valley in a direction crossing each other.

Here, the width of the knurled groove is within the range of 0.05mm to 0.1mm, the depth is preferably within the range of 0.025mm to 0.06mm.

The shape of the knurled surface may include any one of a polygonal shape such as triangular, square, pentagonal, hexagonal, and the like, and the vulcanization mold may include a side plate mold corresponding to a sidewall of the finished tire.

Further, according to the manufacturing method of the vulcanization mold for tires of the present invention, the knurled groove formed in the knurled surface of the vulcanization mold is formed through an etch process, and the etching process is a process of the vulcanization mold. Applying a photoresist to the surface; Exposing the porter resist by irradiating UV light onto the photo mask having the knurled groove shape on the coated photoresist; Spraying an etchant on the exposed porter resist to corrode the knurled protrusion shape; And separating the porter resist from the processing surface of the vulcanization mold.

In addition, in the pneumatic tire manufactured as a finished product using the above-mentioned tire vulcanization mold of the present invention, the pneumatic tire is partitioned continuously in all directions in a predetermined pattern of the knurled surface of a predetermined shape on the surface of the side wall, The two knurled surfaces which are partitioned adjacent to each other are formed with a plurality of knurled protrusions forming a mountain in a direction crossing each other.

Here, the width of the knurled projection is within the range of 0.05mm to 0.1mm, the height is preferably within the range of 0.025mm to 0.6mm.

In addition, the shape of the knurling surface may include any one of a polygonal shape such as triangular, square, pentagonal, hexagonal.

According to the present invention, a fine knurled groove is formed on the outer surface of the sidewall portion of the tire in the process of vulcanization by forming a fine knurled groove on the vulcanization surface of the side plate mold corresponding to the sidewall portion of the tire. It is possible to improve the stain resistance of the side wall portion of the tire.

In addition, the knurled surface of a predetermined shape in the side wall portion of the tire in a predetermined pattern partitioned continuously in all directions, and by forming a plurality of knurled projections forming a mountain in a direction crossing each other on the two knurled surface adjacently partitioned with each other This has the effect of improving the appearance of the tire.

1 is a partial cutaway perspective view showing a pneumatic tire according to an embodiment of the present invention.
FIG. 2 is an enlarged side view of part II of FIG. 1.
3 is a side cross-sectional view taken along line III-III of FIG. 2.
Figure 4 is a side cross-sectional view showing a vulcanization mold for tires of the present invention.
5 is a partial side view illustrating part V of the side plate mold of FIG. 4.
6 is a side cross-sectional view taken along line VI-VI of FIG. 5.
FIG. 7 is a schematic view showing an etching process of a side plate mold of the vulcanization mold for tires of FIG. 4.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a partial cutaway perspective view showing a pneumatic tire according to an embodiment of the present invention.

Referring to FIG. 1, the pneumatic tire 1 includes a tread portion 10, a shoulder portion 20, a sidewall portion 30, and a bead portion 40 on both sides of the tread portion 10. Is sequentially formed extending, the inner space is filled with the air is formed therein.

Here, the tread part 10 is a part in contact with the ground when the vehicle is driving, and various tread patterns may be applied according to the function and purpose of the tire. The shoulder portion 20 is a shoulder portion that gradually reduces in thickness from the tread portion 10 and connects the side wall portion 30. The side wall portion 30 serves to support the load of the vehicle and to mitigate external shocks due to the stretching motion. And the bead part 40 serves to couple and secure the tire to the rim.

In particular, the outer surface of the side wall portion 30 is formed with a fine knurled projection 36 for improving the appearance and easy to clean and increase the stain resistance.

FIG. 2 is an enlarged side view of part II of FIG. 1, and FIG. 3 is a side cross-sectional view taken along line III-III of FIG. 2.

Referring to FIGS. 2 and 3, the knurled surface 35 having a predetermined shape on the surface of the side wall part 30 is continuously divided in four directions in a predetermined pattern. In addition, a plurality of knurling protrusions 36 forming a mountain in a direction crossing each other are formed on the two nulling surfaces 35 that are adjacent to each other.

Here, the width b1 of the knurling protrusion 36 may include a range of 0.05 mm to 0.1 mm, and a height h1 of 0.025 mm to 0.6 mm.

When the width b1 of the knurled protrusion 36 is less than 0.05 mm, it is difficult to manufacture the vulcanization mold 100 for forming the knurled protrusion through the vulcanization process, and when it exceeds 0.1 mm, the contamination resistance by the knurled protrusion 26 is Has the disadvantage of deteriorating,

In addition, when the height h1 of the knurled projection 36 is less than 0.025 mm, the fouling resistance by the knurled projection 36 is lowered, and when the height h1 is greater than 0.6 mm, a vulcanization mold for forming the knurled projection 36 through a vulcanization process. There is a disadvantage that the production of 100 becomes difficult.

As described above, the pneumatic tire 1 according to the present embodiment has irregularities formed on the outer surface of the side wall part 30 by the fine knurled protrusions 36 to have a lotus leaf effect, thereby improving superhydrophobicity and fouling resistance and contaminating. It has an effect of facilitating cleaning without being easily contaminated by substances or dust.

Figure 4 is a side cross-sectional view showing a vulcanization mold for tires of the present invention.

Referring to FIG. 4, the fine knurling protrusion 36 is formed by the vulcanization mold 100 in the process of manufacturing the finished tire 1 by putting the molded green case into the vulcanizer and vulcanizing it at a high temperature and high pressure. do.

Therefore, fine knurling grooves 126 are formed in the side plate mold 120 corresponding to the outer surface of the side wall portion 30 of the finished tire 1 to form the fine knurled protrusions 36.

FIG. 5 is a partial side view illustrating part V of the side plate mold of FIG. 4, and FIG. 6 is a side cross-sectional view taken along line VI-VI of FIG. 5.

Referring to FIGS. 5 and 6, the knurled surface 125 of a predetermined shape is continuously partitioned in all directions on a vulcanized surface of the side plate mold 120 in a predetermined pattern.

In addition, a plurality of knurling grooves 126 are formed in the two knurled surfaces 125 which are divided adjacent to each other to form a valley in a direction crossing each other.

Here, the knurled groove 126 may have a width b2 within a range of 0.05 mm to 0.1 mm and a depth h2 within a range of 0.025 mm to 0.06 mm to correspond to the knurled protrusion 26 described above.

Here, when the width b2 of the knurling groove 126 is less than 0.05 mm, it becomes difficult to manufacture the side plate mold. When the width b2 of the knurling groove 126 is less than 0.1 mm, the knurled groove formed in the sidewall portion 30 of the tire to correspond to the knurled groove 126. The width | variety of the projection 36 becomes large and pollution resistance falls.

In addition, when the depth h2 of the knurled groove 126 is less than 0.025 mm, the height of the knurled projection 36 formed in the sidewall portion of the tire corresponding to the knurled groove 126 becomes too low, so that the stain resistance is reduced, and 0.06 mm. If it is exceeded, the production of the side plate mold 120 becomes difficult.

The fine knurling grooves formed in the respective knurling surfaces 125 of the side plate mold 120 may be formed by etching.

FIG. 7 is a schematic view showing an etching process of a side plate mold of the vulcanization mold for tires of FIG. 4.

Referring to FIG. 7, before forming the fine knurling groove 126 of the side plate mold 120, first, cast steel, which is a raw material, is placed on a lathe, and then subjected to lathe machining according to size.

Then, the fine knurling grooves 126 are formed on the vulcanized surface of the side plate mold 120 in which the preceding work is completed through etching.

The etching process for forming the fine knurling groove 126 may include a photoresist coating step ST1, an exposure step ST2, an etching step ST3, and a photoresist separation step ST4. It is a place of living.

In the photoresist coating step (ST1), the vulcanized surface of the side plate mold 120 is cleanly coated to cover a UV-sensitive photosensitive resin, that is, a photoresist 210.

In the exposure step ST2, the photomask 220 punched in the shape of the knurling groove 126 is raised on the applied photoresist 210 and then irradiated with UV light. In this case, the photoresist 210 is selectively exposed to the UV light through the photo mask 220 shows a chemical change.

In the etching step ST3, a corrosion solution such as ferric chloride is sprayed to corrode a necessary portion to form a fine knurling groove 126. In the photoresist separation step, the photoresist 210 is neutralized by etching and then removed, and the rust preventive oil is applied.

As such, the fine knurled groove 126 may be formed in the vulcanization surface 121 of the side plate mold 120 corresponding to the side wall portion 30 of the tire 1 through an etching process.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. In addition, it is natural that it belongs to the scope of the present invention.

1: pneumatic tire 10: tread portion
20: side wall portion 30: shoulder portion
40: bead part 35: knurled surface
36: knurled protrusion 100: vulcanization mold
120: side plate mold 125: knurled surface
126: knurled groove 210: photoresist
220: photomask

Claims (9)

In the vulcanization mold for vulcanizing the molded green case to the shape of the finished tire,

The vulcanization mold,
Including a side plate mold corresponding to the side wall portion of the finished tire,

On the vulcanization surface of the side plate mold,
A predetermined knurled surface is partitioned continuously in all directions in a predetermined pattern, and the two knurled surfaces that are partitioned adjacent to each other are provided with a plurality of knurled grooves forming a valley in a direction crossing each other.

The width of the knurled groove is in the range of 0.05mm to 0.1mm,
A vulcanization mold for a tire comprising a depth in the range of 0.025 mm to 0.06 mm.
delete In claim 1,
Vulcanization mold for a tire comprising the shape of the knurled surface is any one of a polygonal shape.
delete In the manufacturing method of the vulcanization die for tires of Claim 1,
And a knurling groove formed on the knurled surface of the vulcanization mold through a etching process.
The method of claim 5,
The etching process,
Applying a photoresist to the processed surface of the vulcanization mold;
Exposing the porter resist by irradiating UV light onto the photo mask having the knurled groove shape on the coated photoresist;
Spraying an etchant on the exposed porter resist to corrode the knurled protrusion shape;
Separating the porter resist from the processing surface of the vulcanization mold manufacturing method for a tire.
In the pneumatic tire manufactured as a finished product using the vulcanization mold for tire of claim 1,

The pneumatic tire,
The knurled surface of the predetermined shape is formed in a predetermined pattern on the sidewall part surface in succession in all directions,
The two knurled surfaces partitioned adjacent to each other are formed with a plurality of knurled protrusions forming a mountain in a direction crossing each other,

The width of the knurled projections is within the range of 0.05mm to 0.1mm,
A pneumatic tire comprising a height within the range of 0.025 mm to 0.6 mm.
delete In claim 7,
The shape of the knurled surface is a pneumatic tire comprising any one of a polygonal shape.

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