KR0135061Y1 - Structure of the joint for tread - Google Patents

Abstract

The present invention relates to a tread mold joint structure of a tire vulcanizer, which is attached to the upper mold (2) and the lower mold (3) of a steel material, respectively, to form a tread mold (4) and an aluminum upper ring (5) and As the first joining ring 7 and the second joining ring 8 are inserted into and contacted with the lower ring 6, the damage caused by the direct contact between the upper ring 5 and the lower ring 6, etc. Excessive protrusion of the upper and lower rings (6) and the lower ring (6), of which the upper and lower molds (2, 3) of the steel material and the thermal expansion rate are different, as well as made of aluminum. By preventing expansion, it is possible to reduce mold release or incomplete vulcanization of the tire due to protruding steps of the upper ring 5 and the lower ring 6 during vulcanization.

Description

Tread mold joint structure of tire vulcanizer

The present invention relates to a tread mold joint structure of a tire vulcanizer, and in particular, the tread mold is formed of a material such as aluminum different from the rudder mold, and is expanded and contracted at different expansion and contraction rates when the temperature rises and cools by an external heat source. In addition to preventing gaps between the molds and deformation of vulcanized tires, the opening and closing of upper molds and lower molds, as well as breakages generated at the contact between the molds and the joints of the tires when the tires are inserted or removed. It relates to a tread mold joint structure of the tire vulcanizer to prevent the.

In general, in the tire manufacturing process, a rubber compounded with various compounding materials is extruded, rolled, combined and molded to form a green tire, which increases the stretchability and elasticity of the green tire according to its use. In addition, vulcanizing agents, such as sulfur, added in the raw material blending process, are combined with rubber molecules to obtain stable intrinsic properties, as well as directly contacting the road surface by treads and protecting the carcass or breaker inside. According to the purpose of use, a vulcanization process is performed to form a tread with various shapes engraved according to the purpose of use. The vulcanization process is carried out in a mold having an inner surface having the same shape as the finished tire to form the tire. A green tire is inserted, and a tubular bladder is inserted into the green tire, and then hot water or steam is inserted into the bladder. As the filling, pressing the green tire is at the same time, the green tire is heated and expanded inside the mold as soon as contact-pressing the vulcanization of the tire is to occur.

Here, the vulcanization mold is conventionally shown in FIG. 3, the green tire is inserted and seated in the inner central portion, and then heated and pressed to form an approximately ring shape to form a shape of the finished tire, and cut into two parts of the upper and lower parts. The upper mold (2) and the lower mold (3) made of, and the inner side of the upper mold (2) and the lower mold (3) formed a circular band shape and inserted and bonded tread engraved with various patterns to form the tread portion of the tire Made of a mold (4).

In addition, the tread mold 4 is composed of an upper ring 5 to be joined and fixed to the side of the upper mold (2) and a lower ring 6 to be in contact with and fixed to the side of the lower mold (3). Bars, various patterns are easily engraved on the tire joints of the upper ring 5 and the lower ring 6 to facilitate the formation of precise grooves of the tread portion, and the upper ring 5 and the lower ring ( In order to improve the ease of work and productivity in the casting process of 6), the use of aluminum is common.

Therefore, the upper mold 2 and the lower mold 3 are spaced apart from each other, and the green mold with the bladder tightly inserted therein is seated on the depression of the lower mold 3, and then the upper mold ( 2) and the lower mold (3) are in close contact with each other and closed, the high temperature and high pressure steam or hot water is filled into the bladder to form a tread on the outer surface of the green tire in contact with the tread mold, The side portions are pressed against and pressed to the upper and lower molds 2 and 3 to form side walls and the like.

However, as described above, the upper ring (5) and the lower ring (6) is rich in ductility and malleability, such as aluminum, and made of a material that is easy to work, resulting in the closing of the vulcanizing mold (1). The upper ring 5 and the lower ring 6 may be damaged or deformed due to mutual contact or impact, as well as to the adhesive force of the tire when the joint is depressed or deformed when the rubber is pressed or contacted during desorption. While the joined portion is deformed by the release pressure of the tire, the upper ring 5 and the lower ring 6 having a coefficient of thermal expansion different from that of the vulcanization mold 1 made of the steel material are formed in the vulcanization mold 1. There was a problem in that the criminal was expanded to a predetermined width and protruded from the side so that the criminal such as the tread portion of the vulcanized tire was inaccurate, and an incomplete vulcanized portion was generated, resulting in the production of defective products.

The present invention has been devised to solve the above problems, and improves the rigidity of the joint of the upper and lower tread molds and prevents damage to the tread mold itself due to contact and impact when joining and closing the upper and lower vulcanized molds. It is possible to reduce the expansion and protrusion due to the thermal expansion coefficient different from the vulcanization mold of the tread mold, the tire vulcanizer to prevent the release of the tire due to the protrusion of the tread mold or the occurrence of incomplete vulcanization part, etc. The purpose is to provide a tread mold joint structure of.

1 is a partial cross-sectional view of the vulcanization mold according to the first embodiment of the present invention.

2 is a partial cross-sectional view of the vulcanization mold according to the second embodiment of the present invention.

3 is a partial cross-sectional view of a conventional structure, corresponding to FIGS. 1 and 2.

* Explanation of symbols for main parts of the drawings

1: vulcanization mold 2: upper mold

2a: first side mold 2b: first side wall mold

3: lower mold 3a: second layer mold

3b: second side moon mold 4: tread mold

5: upper ring 6: lower ring

7: first joining ring 8: second joining ring

9: junction

The present invention for achieving the above object has a structure in which joining rings made of steel materials are respectively added and fastened to the upper and lower ends of the upper and lower ends forming the tread mold.

In addition, another configuration of the present invention in accordance with the above object is to extend the side mold of the steel material to reach the upper and lower front end of the upper ring and the lower ring so that the junction of the upper ring and the lower ring and the side mold to form a tread mold Structure.

According to the present invention configured as described above, when the tip of the upper ring and the bottom of the lower ring are in contact with the closure of the vulcanization mold, the closure of the vulcanization mold is closed while the joining ring of steel material is made to be more rigid than the aluminum material. The side molds of the steel material expanded and fastened between the upper ring and the lower ring are brought into contact with each other to close the vulcanization mold so that the tire is vulcanized.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a main portion of the vulcanization mold according to an embodiment of the present invention, Figure 2 is a view showing a main cross-sectional view of the vulcanization mold according to a second embodiment of the present invention, a third view showing a conventional structure The same reference numerals will be used for the same parts, and detailed description thereof will be omitted.

The present invention, after the green tire is inserted and seated therein, the upper mold (2) of the steel material cut into two upper and lower parts while forming a ring-shaped hollow portion inside to form a shape of the finished tire by pressing and heating The lower mold (3) and the upper ring (5) and the lower ring (6) engraved with various patterns to form the tread portion of the tire while forming a circular band shape are formed at the inner ends of the upper mold (2) and the lower mold (3). It consists of an aluminum tread mold 4 formed by being seated and fastened.

Here, the shape of the upper ring 5 and the lower ring 6 while being cut to form a rectangular cross-sectional shape at the lower end of the upper ring 5 and the upper end of the lower ring 6 forming the tread mold 4. The first joining ring 7 and the second joining ring 8 formed of a steel material are seated and fastened, respectively, while forming a circular band shape along the band-shaped cut portion.

In addition, the first side wall mold 2b formed in a semi-circular cross-sectional shape and recessed from the inside to the top so as to form the side wall portion of the tire, and a substantially circular band at the outer end portion of the first side wall mold 2b. The upper mold 2 is formed as a first side mold 2a fastened to form a fastener, and is formed at a lower side of the first side world mold 2b while forming a shape corresponding to the first side wall mold 2b. A second sidewall mold having a semicircular cross-sectional depression of the second sidewall mold 3b formed to face the depression of the first sidewall mold 2b and a shape corresponding to the first side mold mold 2a. The lower side mold 3 is formed by the second side mold 3a fastened to form an outer band at the outer end of the mold 3b, while the first side mold 2a and the second side mold 3a are formed. The upper ring 5 and the lower ring 6 made of aluminum having a circular ring shape on the inner circumference thereof are in close contact with each other. At the lower end of the upper ring 5 and the upper end of the lower ring 6, the first side mold 2a and the second side mold 3a extend inwardly so that the upper ring 5 and the lower ring 6 A joint 9 inserted and fastened between the upper and lower ends of the upper ring 5 and the lower ring 6 is formed to extend to the extended curve position of the upper ring 5 and the lower ring 6. 4) will be achieved.

Thus, in joining the upper mold 2 on the lower mold 3 for vulcanizing the tire, the first joining ring 7 and the second mounted ring between the upper ring 5 and the lower ring 6 are attached. As the joining ring 8 abuts, the vulcanization mold 1 is brought into close contact with and closed, so that the vulcanizing operation is performed, and the upper mold 2 composed of the first side wall mold 2b and the first side mold 2a is formed. In joining on the two side wall mold 3b and the first side mold 3a, the first side mold 2a and the second side mold 3a are brought into close contact with each other, and the first side mold 2a The joining portion 9 of the joining portion 9 and the second side mold 3a abuts to form the tread mold 4 with the upper ring 5 and the lower ring 6, thereby performing the tire vulcanization and tread forming process. .

As described above, according to the present invention, when the upper mold 2 and the lower mold 3 are bonded to each other and closed, the joining rings 7 and 8 and the side molds of steel material are made to have rigidity compared to materials such as aluminum. The joints 9 of 2a and 3a come into contact with each other to prevent breakage due to contact and impact of the upper mold 2 and the lower mold 3, and are made of a material such as aluminum having different thermal expansion and contraction rates. By preventing excessive protrusion and expansion of the formed upper ring 5 and the lower ring 6 there is an effect that can reduce the release of the tire or the formation of incomplete vulcanization portion.

Claims (2)

The upper mold (2) and the lower mold (3) of steel material cut into two parts of the upper and lower parts while forming a ring-shaped hollow part to be heated and pressurized to form the finished tire after the green tire is inserted therein, and the tire The upper ring (5) and the lower ring (6) of a circular band shape engraved with a pattern to form a tread portion is an aluminum tread mold (4) fastened to the inner ends of the upper mold (2) and the lower mold (3). In the tire vulcanizer, the upper and lower ends of the upper ring 5 and the lower ring 6 are cut into rectangular cross-sectional shapes, and the first joining ring 7 made of steel having a circular band shape at the cut portion; A tread mold joint structure of a tire vulcanizer, wherein the second joining rings 8 are respectively seated and fastened. According to claim 1, wherein the first side mold (2a) and the second side mold (3a) mounted on the outer surface of the upper mold (2) and the lower mold (3) is the upper ring (5) and the lower ring (inside) The tread mold joint structure of the tire vulcanizer of claim 6, wherein the junction part 9 is formed by being in close contact with the upper and lower ends of the upper part and extending to reach the extension curve of the upper ring 5 and the lower ring 6.