JPS5849232A - Vulcanizer - Google Patents

Abstract

PURPOSE:To obtain the titled vulcanizer for vulcanizing large-sized tires by hot plates such as radial tires for passenger cars the thickness of the side wall sections of which is thin, by arranging sections having different thermal conductivities between heating sections and the object to be vulcanized in accordance with the thickness of the object. CONSTITUTION:The object to be vulcanized, that is, an unvulcanized tire 5 in molds 3, 4 is vulcanized by the heat from a heating section 6. In this case, to correspond to the thickness of the unvulcanized tire 5, the sections (a) such as the annular recesses 7 having different thermal conductivities are arranged between the heating section 6 and the unvulcanized tire 5 to constitute aimed vulcanizer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vulcanizing device, and more particularly to a vulcanizing device that vulcanizes a material to be vulcanized in an upper mold using heat imparted from a heat generating part. It is about improvement.

Conventionally, in this type of device, consideration has only been given to improving heat transfer between a hot plate constituting a heat generating part and a mold. In other words, the contact surface between the hot plate and the mold is made as wide and smooth as possible, and there are no grooves or depressions on each surface unless it is unavoidable due to installation, manufacturing, or other reasons. . As a result, in areas where the mold wall thickness is thin, that is, in areas where the distance between the product and the hot plate is small, more heat is applied to the product than in other areas, resulting in uneven vulcanization of the product. Ta.

゛ To further explain this, for example, Fig. 1(a) (
In the hot plate type tire vulcanizing apparatus shown in b), especially (b)
As is clear from the figure, during vulcanization, the sidewall portion 1
1 is not only thinner than the bead portion 10 and the shoulder portion 12, but also has upper and lower heating plates 1 constituting the heat generating portion.
and the side wall portion 11 having a small distance from 2,
The bead portion 10 has a larger distance from each hot plate compared to this.
And because more heat is transmitted than the shoulder part 12,
While the sidewall portion 11 is waiting for the bead portion 10 and the shoulder portion 12 to be vulcanized, the sidewall portion 11 is excessively vulcanized, which is unfavorable in terms of tire performance.

It is an object of the present invention to solve the above-mentioned problems and to be able to impart an appropriate amount of heat to a material to be vulcanized corresponding to the wall thickness of the material to be vulcanized, in particular for hot plate vulcanization of large tires. To provide a vulcanizing device most suitable for hot plate vulcanization of particularly thin radial tires for passenger cars.

The feature is that in a vulcanizing device that vulcanizes the object to be vulcanized in the mold by heat applied from the heat generating part, the heat generation The point is that parts having different thermal conductivities are arranged between the part and the object to be vulcanized.

Hereinafter, the present invention will be explained in detail by way of examples with reference to the drawings.

FIGS. 2 to 5 show a vulcanizing apparatus according to an embodiment of the present invention, FIGS. Enlarged view of main parts, Figure 3 (a) (b
) is the second embodiment, (a) is an explanatory cross-sectional view, (b) is an enlarged view of the same essential part, and FIG. 4 is the third embodiment, (a) is an explanatory cross-sectional view.
b) is an enlarged view of the same essential parts, (C) is a perspective view of the same thermal conductivity changing ring, FIG.
b) is an enlarged view of the same main part, and (C) is a perspective view of the same thermal conductivity changing link.

In the figure, El + E2 y E3 and E4 are hot plate type tire vulcanizers each according to an embodiment of the present invention, and the materials to be vulcanized in the molds 3 and 4 are heated by the heat imparted from the heat generating part 6. In other words, the unvulcanized tire 5 can be vulcanized, and the heat generating part 6 and the unvulcanized tire 5 have different thermal conductivities depending on the wall thickness of the unvulcanized tire 5. It is constructed by arranging part a.

To further explain this structure, each of the above-mentioned hot plate type tire vulcanizers El r E2 s E3 and E4 has a hot plate 1 equipped with a heat generating part 6, that is, a steam cavity inside.
, 2, and upper and lower molds 6.4 each having a housing for unvulcanized tires 5 inside. By applying heat to the vulcanized tire 5 from the outside and applying heat from the inside of the unvulcanized tire 5 using pressurized steam or the like, the unvulcanized tire can be vulcanized.

In the first embodiment, as shown in FIGS. 2(a) and 2(b), four annular portions 7 are provided on the outer surfaces of the upper and lower molds 6, 4 corresponding to the sidewall portions 11. Sidewall part 1 whose wall thickness is thinner than other parts, and during vulcanization, the mold wall thickness is also thinner than other parts.
The heat transfer to 1 can be optimized.

In addition, in the second embodiment shown in FIGS. 3(a) and 3(b), an annular four portion 8 is provided on the side surface of the mold at a portion corresponding to the side wall portion 11 of the hot plates 1 and 2 provided with the heat generating portion 6. This is an example in which a portion a having a different thermal conductivity from other portions is formed by this. Note that numerals 9 in the figure indicate heat flow lines generated from the heat generating portion 6, respectively.

Furthermore, the third embodiment shown in FIGS.
This is an example in which a plurality of ring-shaped thermal conductivity changing rings G, which may be 1-long, are interposed between the hot plate and the mold as a means for forming a portion a with different thermal conductivity between the hot plate and the mold. .

In the case of this embodiment, the gap G3 formed between the small-diameter inner ring G1 and the large-diameter outer ring G2 is formed in a portion corresponding to the sidewall portion 11 on the outer surface of the mold. 0 Therefore, as in the embodiment described above, the thickness of the tire is thin compared to other parts, and the thickness of the mold is also thin compared to other parts. , this gap G3 allows proper cooling.

In addition, in the fourth embodiment shown in FIG. This is an example in which an appropriate amount of heat can be supplied to the object to be vulcanized by intervening in Long G1 and large diameter outer ring G2
A ring G4 made of a full Cf asbestos or the like having a different thermal conductivity from each of Gl and G2 is arranged between them.

Therefore, similarly to the above-mentioned embodiment, the heat transfer to the tire sidewall portion 11, where the tire wall thickness is thinner than other portions, and the mold wall thickness is also thinner than other portions. It can be optimized by ring G4.

As described above, the present invention is a vulcanizing device that vulcanizes a material to be vulcanized in a mold using heat imparted from a heat generating part. Since a part with a different thermal conductivity is placed between the part and the material to be vulcanized,
An appropriate amount of heat corresponding to the wall thickness of the vulcanizable material can be imparted to the vulcanizable material.

Therefore, it is possible to vulcanize radial tires for passenger cars with particularly thin sidewalls, as well as large tires for trucks and buses that could not be cured with conventional hot plate vulcanizers due to uneven heat transfer. It can be done.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) show a conventional hot plate type vulcanizing apparatus, in which (,) is an explanatory cross-sectional view, and (b) is an enlarged view of the main part. Further, FIGS. 2 to 5 show a vulcanizing apparatus according to an embodiment of the present invention, and FIGS. 2(a) and 2(b) show the first embodiment, and (a
) is an explanatory cross-sectional view, (b) is an enlarged view of the same main part, and Figure 3 (a)
(b) is a second embodiment, (a) is a cross-sectional explanatory diagram, (b) is an enlarged view of the same main part, and FIG. 4 is a third embodiment, (a) is a cross-sectional explanatory diagram, and (b) is the same main part. (C) is a slanted diagram of the same thermal conductivity changing ring, FIG. FIG. 3 is a perspective view of the thermal conductivity changing ring. 5... Vulcanized material, 6... Heat generating part, a... Portion with different thermal conductivity. Agent Patent Attorney Shin Ogawa - Patent Attorney Masaru Noguchi Patent Attorney Kazuhiko Saishita C166 Figure (1)) Figure (b) Figure 3 (b)

Claims (1)

[Claims] In a vulcanizing device that vulcanizes a material to be vulcanized in a mold using heat imparted from a heat generating part, the distance between the heat generating part and the material to be vulcanized is adjusted according to the wall thickness of the material to be vulcanized. A vulcanizing device characterized in that parts having different thermal conductivities are arranged outside in between.