KR0139263B1 - Tire mold with an air-hole - Google Patents

Abstract

In a tire die equipped with a plug, air outlets 3, 10, and 10 'of different diameters, which penetrate outwardly from the mold inner surface 8, are formed, and therein, the first air discharge groove. (9), (9 '), third air outlet holes (11), (11'), through holes (13), (17), and air passages (14) formed in the longitudinal and horizontal plugs (1), (1 Inserting and fixing ') in various forms to completely discharge the air between the mold and the raw tire when the tire is vulcanized, thereby damaging the appearance of the tire by the occurrence of bare phenomena or extraction of rubber due to the air remaining in the mold. This did not happen.

Description

Tire Mold with Air Vent

1 is a cross-sectional view of the state in which the raw tire is mounted on the pre-vulcanization tire mold

Figure 2 a) is a cross-sectional view of a conventional mounting state of the drill band hole in the tire mold

b) is a cross-sectional view of the conventional tire mold with the strainer cap attached

c) is a sectional view of the conventional tire mold with the plug attached

d) is a sectional view of a state in which a valve is mounted on a conventional tire mold;

Figure 3 a) is a cross-sectional view of a state in which the plug and grip according to the invention mounted on the mold

b) is a cross-sectional view taken along the line A-A of FIG.

c) is a longitudinal sectional view when the plug used in the present invention is mounted in the second air outlet;

d) is a longitudinal sectional view of another example when the plug used in the present invention is mounted in a second air outlet;

4, 5, and 6 are cross-sectional views of a state in which the plug of the form according to the invention is mounted.

* Explanation of symbols for main parts of the drawings

1: Plug 1 ': Small plug

2: upper box 3: air outlet

4: lower type 5, 5 ': grip

6: raw tire 7: air outlet

8: inner surface of mold 8 ': inner end of plug

9, 9 ': first air outlet groove 10, 10': second air outlet

11, 11 ': 3rd air discharge hole 12, 12': outer circumference

13, 17: through hole 14: air passage

15: step 15 ': small plug outer end

15: Small plug, inner end

19: thread

The present invention relates to a mold having an air discharge groove on an outer circumferential surface of a plug or an air discharge groove at an air discharge hole for mounting the plug. In particular, the air between the mold and the live tires is formed at the plug or air discharge port when the tire is vulcanized. The present invention relates to a mold for minimizing the amount of extraction and the extraction traces left on the tire surface by discharging them out of the mold through the grooves.

Tire semi-finished products are made of raw tires through a molding process manufactured according to tire specifications, and the raw tires are elasticized by intermolecular bond reactions by chemicals added in semi-finished products by vulcanizing the raw tires under a predetermined time, pressure and temperature. Is completed. However, as shown in FIG. 1, when the raw tire is vulcanized due to the air remaining in the mold, the bare tire is not evenly contacted with the inner surface of the mold, causing a bare phenomenon. There was a problem.

When the tire is cured, the raw tire 6 is expanded by a bladder for supplying pressure and heat to the inside of the raw tire, so that air between the upper and lower molds 2 and 4 and the raw tire 6 is increased. Is discharged to the outside through the air outlet (3) installed to penetrate the outside of the mold, at this time, the rubber of the tire as well as the air is extracted by the extrusion (extrusion) is left after the completion of the vulcanization and thus cut a separate Not only does the process require a raw material loss, but the appearance of the tire is poor.

The conventional method for solving the above problems is a method of installing an air discharge member to prevent the extraction of the rubber to the inside of the air discharge port 3 as much as possible, for example, a hole (7) having a diameter of 0.3mm or less STRAINER CAP which drills a plurality of holes, a plug 1 which drills a plurality of holes 7 below 1.0 mm in a round rod of a predetermined size, or a valve 1, and the like. However, these air exhaust members leave little bleeds or traces of the members themselves on the finished tires, especially since these members are frequently blocked and difficult to maintain, they are not used at present and penetrate the grooves separately when using valves. Extraction is caused by the hole to make the appearance very poor.

In addition, the currently used technology is designing, manufacturing and using the tire tread ground plane in the mold in the shape of mosaic or polygonal, and only the air is discharged along the split boundary of the mold and Rubber prevents extraction and produces tires with the best appearance.

However, the above method has a disadvantage in that the mold manufacturing cost is very expensive, and a high level of manufacturing technology and a special manufacturing facility are required.

In order to solve this problem, the present invention greatly improves the existing plug to minimize tire extraction, and install a plug having an air discharge groove on the outer circumferential surface or discharge the air to the air outlet to which the plug is to be mounted so as to be implemented by a conventional manufacturing technique. By installing a groove, it is possible to effectively discharge air.

In general, some type of gap must exist to discharge the air between the mold inner surface and the live tire, and the gap must be closed first when the raw tire approaches the mold surface and the second gap is enlarged to extract the rubber. There is a method of minimizing the third gap, so that only the air is discharged and the rubber is not out. Among them, the present invention relates to the third method, which is a well-known technique and a method that is not industrially difficult and has good industrial use value. It is about.

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

Referring to FIG. 3, as an embodiment of the present invention, an air outlet 3 penetrating out of the mold from the inner surface 8 of the molds 2 and 4 is provided and has a diameter larger than that of the air outlet 3. After counter boring the larger second air outlet 10, the grip 5 having a plurality of third air outlet holes 11 formed inside the second air outlet 10 is assembled by interference fit. As shown in FIG. 3 c), the first air outlet groove 9 is provided in the outer circumferential surface 12 of the plug 1 or as shown in FIG. 3 d) the inner circumferential surface of the second air outlet 10 The plug 1 is inserted into the second air outlet 10 so that the inner end 8 'of the plug 1 coincides with the inner surface 8 of the mold and the outer peripheral surface 12 of the plug 1 Is lightly fitted to the inner surface of the second air outlet 10 so that the outer protruding end 18 of the plug 1 is assembled to the grip 5 by interference fit.

Here, the grip 5 serves as a female of a pair of buttons in manufacturing a tire using the present mold so that the protruding end 18 of the plug 1 does not escape from the grip 5, and also a conventional discharge port. When assembling the plug (1) in the room temperature (10) when the grip (5) is not there is a need for a clamp fit, and to fit the clamp to the impact on the inner surface of the plug, the first air outlet grooves (9) There is a closed end and the outer circumferential surface 12 of the plug 1 is to be assembled in an intermediate fit method to the inner surface of the second air outlet 10 in order to eliminate this closed end. The grip 5 is preferably made of stainless steel or heat-resistant plastic.

When the first air outlet groove 9 is arranged on the outer circumferential surface 12 of the plug 1 or the inner circumferential surface of the second air outlet 10, the inner surface of the second air outlet 10 and the plug 1 When assembling, contact is made to be centered, and the other side is composed of a spline shaft or concave surfaces of KNURLING type of various cross sections to make the first air discharge groove 9, and is assembled to the grip 5 at the outer end. The protruding end portion 18, which serves as a male of the paired button, is spoken, wherein the gap of the first air discharge groove 9 includes the physical properties of the rubber, the temperature of the mold, the pressure of the rubber in close contact with the mold inner surface 8, Although the difference in the degree of extraction occurs even at the same interval depending on the time interval for increasing the pressure, the test result is ideal within 0.03-0.1, and the material of the plug (1) is ideal for nickel, stainless steel, etc., which has low adhesion to rubber. Good heat resistance and extreme coefficient of thermal expansion Low plastic are possible.

The air discharge path includes a first air discharge groove 9, a second air discharge hole 10, a third air discharge groove 11, and an air discharge hole installed between the outer circumferential surface of the plug 1 and the second air discharge port 10. It is discharged out of the mold through 3) annually.

4 is another embodiment of the present invention, which differs from FIG. 3 except that the grip 5 is omitted, and the third air discharge hole 11 ′ is formed at the center of the end of the plug 1 to remove the plug 1. 2 It is designed to fit the role of the grip 5 by fitting the clamp when assembling the air outlet 10 '. As shown in FIG. 3, the first air outlet grooves 9 are filled when impacting the inner surface during plug assembly. If not discarded, it is an available structure.

As a method for preventing the filling of the first air discharge groove 9, the plug 1 is cooled and shrunk before assembling, and then the assembly is loosened to return to the normal first air discharge groove 9 at normal temperature or assembled at room temperature. It is also possible to achieve the desired purpose by means of an intermediate fit by technique.

5 is another embodiment of the present invention, which differs from FIG. 4 in that the grip force of the plug 1 is reinforced in the second air outlet 10 ', and FIG. 4 is similar to the outer circumferential surface 12 of the plug 1. In FIG. 5, the thread 19 is formed at the inlet of the air outlet 3, which is added to it in FIG. 4, and the length of the plug 1 is changed, depending on the adhesion resistance of the inner surface of the second air outlet 10 '. It extends without a thread to increase a little grip force when assembling the plug 1, and also penetrates the plug 1 to form a vertical hole, and then vertically and vertically connects the vertical hole to the air outlet 3 ) And the third air discharge hole 11 'is installed to be penetrated. Of course, at this time, it is possible to omit the thread of the inlet portion of the air outlet 3 to secure the grip force by the adhesive.

FIG. 6 shows an embodiment in which two or more rows of the first air discharge grooves 9 are installed for the purpose of increasing the amount of air discharge in the embodiments of FIGS. 3, 4, and 5, and the plug 1 of FIG. And the second air outlet 10 ', the first air outlet groove 9 is installed in the outer peripheral surface 12 of the plug 1 and again in the center of the plug 1, as shown in FIG. Another second air outlet at the inner surface of the second air outlet 10 'and at the center of the plug 1 as shown in FIG. After the groove 9 'is provided, a through hole 13 vertically penetrated at the center of the plug 1 is further installed to serve as a passage of air discharged through the first air discharge groove 9', In addition, the outer circumferential surface 12 of the small plug 1 ′ or the inner circumferential surface 10 of the plug 1 may be provided in addition to the portion having the first air discharge groove 9 ′ close to the mold inner surface 8. In addition to the portion having the plug 1 ', a portion having a smaller outer diameter than the small plug 1' is formed to form a circumferential air passage 14, and on the inner circumferential surface 10 of the plug 1, the small plug ( The outer end 15 'of the 1') abuts to form a step 15 for assisting assembly so that the inner end 15 of the small plug 1 'coincides with the mold inner surface 8, and the mold outer surface 16 Or an end portion 20 of the plug 1 having an outer circumferential surface which is connected to the counter boring inner surface 16 'from the mold outer surface so as to simultaneously grip the plugs 1, 1' on the grip 5 '. In this case, the grip force with the grip (5 ') is a screw connection, a bond by an adhesive, a joint roughening the contact surface roughness of the two parts, the air discharged from the pure grip (5') to the air outlet (3) continuously Through holes 17 penetrate to the outside of the mold to be discharged. The air discharge passage has a through hole 17 penetrating the first air discharge hole 9, the second air discharge port 10 ', the third air discharge hole 11', the air discharge port 3, and the grip 5 '. It is discharged to the outside of the mold through the small plug (1) the first air discharge groove (9 ') between the outer peripheral surface 12 of the small plug (1') and the inner peripheral surface (10) of the plug (1), circumferential passage ( 14) flows through the through hole 13 vertically penetrating the plug 1 to the second air outlet 10 ′ and merges with the air discharged from the air discharge passage of the plug 1 to open the through hole 17. Is discharged through.

Some of the embodiments described above may be summarized as the inner surface of the plug 1, the outer level 12 of the plug 1, 12 ′, or the second air outlet 10, 10 ′ and the plug 1. When the air discharge grooves 9 and 9 'are installed on the inner surface 10, the air discharge grooves 9 and 9' have the shape of a negative portion of the spline shaft concept, KNURLING) and the like, and then, in order to GRIPP the plug to the air outlet 3, the mating button principle, precision processing by the fitting technique, and the thermal expansion coefficient of the plug and mold after cooling are applied. The method can be combined with the grip force due to the material properties of the grip, and the present invention can be embodied by combining the two in any other way.

The outer circumferential surfaces 12 and 12 'of the plugs 1 and 1' have the air discharge grooves 9 and 9 'or the second air outlets 10 and 10'. Molds with air discharge grooves (9) and (9 ') on the inner surface or plug (1) can be manufactured at a lower price than other methods, and the best appearance by preventing extraction from occurring on the tire surface and leaving only traces of selectivity. Tire production having

Claims (8)

In a tire mold equipped with a plug, a second air outlet (3) penetrating from the inner surface (8) of the mold (2, 4) to the outside of the mold and having a larger diameter than that of the air outlet (3) The first air discharge groove 9 is provided on the inner surface of the air outlet 10 so that the plug 1 is lightly fitted to the inner surface of the second air outlet 10 so that the outer protruding end 18 of the plug 1 ) Is a tire mold with an air discharge groove, characterized in that the grip (5) to be assembled into the interference fit. The tire mold according to claim 1, wherein the grip (5) is made of stainless steel or heat-resistant plastic. 2. The tire mold according to claim 1, wherein the size of the first air discharge groove is in the range of 0.03-0.1 mm. The tire mold according to claim 1, wherein the plug (1) is made of nickel, stainless steel, or a plastic having excellent heat resistance and extremely low coefficient of thermal expansion. The method of claim 1, wherein in place of the grip 5, a third air outlet 11 'is formed at the center of the end of the plug 1 so that the clamp 1 is clamped when assembling the second air outlet 10'. Tire mold with air exhaust groove characterized by fitting. In a tire mold equipped with a plug, a second air outlet (3) penetrating from the inner surface (8) of the mold (2, 4) to the outside of the mold and having a larger diameter than that of the air outlet (3) After counter boring the air outlet 10, the plug 1 having the first air discharge groove 9 recessed in the outer circumferential surface is inserted into the second air outlet 10 so that the inner end 8 ′ is the inner surface of the mold. While coinciding with (8), the outer circumferential surface 12 of the plug 1 is lightly fitted to the inner surface of the second air outlet 10, but forms a thread 19 or an adhesive layer at the inlet of the air outlet 3; To extend the length of the plug (1) without a thread, and through the plug (1) to erect a vertical hole, and to make the hole in the plug length direction perpendicular to the vertical hole to pass through the air outlet (3) Tire mold having an air discharge groove, characterized in that the third air outlet hole 11 is laid. In a tire die equipped with a plug, a counter boring of the air outlet port 3 penetrating from the inner surface 8 of the molds 2 and 4 to the outside of the mold is carried out, and then the outer circumferential surface 12 of the plug 1 or the second air. A first air discharge groove 9 is formed in the inner circumferential surface of the outlet 10 'so that the plug 1 is inserted into the second air outlet 10 so that the inner end 8' of the plug 1 is closed. The outer circumferential surface 12 of the plug 1 is fitted to the inner surface of the second air outlet 10 while coinciding with the inner surface 8, but has a hole for embedding a small plug 1 ′ in the center of the plug 1. Is installed in two stages, and another first air discharge groove 9 'is installed on the outer circumferential surface 12' of the small plug 1 'or on the inner circumferential surface 10 of the plug 1, and the first air is discharged. The through hole 13 penetrates vertically from the center of the plug 1 so as to serve as a passage for the air discharged into the groove 9 '. (1 ') passes through the first air discharge groove (9') close to the mold inner surface (8 ') and connects a portion smaller in diameter to form an atomic air passage (14), and the plug (1) The inner end 15 forms a step 15 for assisting assembly so as to match the mold inner surface 8, and is connected to the inner surface 16 of the mold outer surface 16 or the outer surface of the mold by boring the plug 1, 1. '), The air is characterized in that the outer peripheral surface of the end portion 20 of the plug 1 is roughened so as to grip simultaneously at the grip 5' with the air outlet 3 and the through hole 17 therethrough. Tire mold with drain groove. 8. The method of claim 7, wherein the grip 5 'and the tip of the plug 1 end 20 are attached with a screw adhesive, a method of roughening the roughness of both contact surfaces, and a method of compressing the grip 5' itself. Tire mold having an air discharge groove characterized in that.