JPH0151452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold for bottle glass used in the field of bottle glass manufacturing.

[Prior Art] Generally, various types of bottle glasses are manufactured by blowing molten glass onto a mold and forming it. Conventionally, molds used in this case are mostly made of metal materials such as castings.

[Problems to be Solved by the Invention] However, it has been pointed out that a problem with using metal materials for bottle glass molds is that cracks tend to form in the shoulders and top of the mouth of the bottle. Ru.

[Means for Solving the Problems] The present invention is intended to solve these problems, and provides a bottle glass in which a part made of a carbon material reinforced with silicon carbide is incorporated into a part of the mold. The purpose is to provide formwork for

The bottle glass mold according to the present invention will be described below according to an example of its manufacturing process.

(1) First, the carbon material is processed into approximately the same shape as the desired part shape.

(2) Place this carbon material together with a silicon-containing material in an inert atmosphere that is not affected by oxygen at a high temperature above the melting point of the silicon-containing material, Penetrate and react.

(3) A carbon material part that has approximately the same shape as the original carbon material obtained in the above process and whose surface layer portion or the entirety is reinforced with silicon carbide is used as it is.
Alternatively, the parts that touch the glass are polished and smoothed before being assembled into the molding surface of the bottle glass mold.

(4) The drawing shows an example of the structure of a bottle glass mold that incorporates the part concerned. That is, in the figure, 1 is the metal formwork body, 2
A metal mouth mold is set on top of the mold body 1 to form the mouth of the bottle, and has a molding air blowing port 3 in its center. Then, a part 4 made of a liquid carbon material reinforced with silicon carbide is fixed to the inner surface of the mouth form 2 at the part that contacts the top of the mouth of the bottle with a fixture 5, and is integrated into the part. There is.

Note that the illustrated example is of course just one example, and the part in which the silicon carbide-reinforced carbon material part is installed is
It can be placed within the mold as appropriate depending on the location where cracks occur in the bottle glass. Moreover, its shape and mounting structure are not limited to the illustrated example, and can be variously changed depending on conditions.

[Function] In this way, if a formwork incorporating carbon material parts reinforced with silicon carbide is used,
It is possible to solve the problem that cracks tend to form in the shoulders and tops of bottles, which is a problem with molds made of metal materials. This is thought to be because the thermal conductivity of the silicon carbide-reinforced carbon material is lower than that of the metal material, so the semi-molten glass in contact with it is cooled more slowly than in the case of a metal formwork. . Furthermore, since the carbon material component is reinforced with silicon carbide, its surface hardness is approximately 9 on the Mohs scale, and has durability comparable to metal material molds. In carbon material parts reinforced with silicon carbide, the ratio of carbon to silicon carbide can be variably controlled depending on the purpose of use, location, etc., by changing the amount of silicon-containing material used when silicon is subjected to an infiltration reaction. Therefore, it has the characteristic that it can be strengthened while retaining the excellent properties of carbon, such as lubricity (easy peelability).

[Example] Examples of the present invention will be described below.

Example 1 Silicon with a weight ratio of Si/C=0.1 was placed on one side of a carbon material processed into a cube with sides of 1 cm, and heated at a temperature of 1800° C. in an argon stream using a high-temperature heating device. Under these conditions, silicon was observed to melt and penetrate into the surface layer of the carbon material. The above operation was also performed on the remaining five faces of the carbon cube. When the reaction surface was examined using an X-ray diffraction device, silicon carbide, carbon, and a very small amount of silicon were found. The Mohs hardness of the reaction surface is approximately 9
The Mohs hardness was significantly improved compared to the starting carbon material, which had a Mohs hardness of about 3. Next, the carbon cubes whose surfaces had been treated with silicon carbide as described above were placed in air at 500° C. for one day. The weight loss due to oxidation of the carbon cubes whose surfaces were treated with silicon carbide was about 1/5 of that of the untreated carbon cubes.

Example 2 A ring-shaped carbon material was prepared by making a hole with a diameter of 12 mm in the center of a disc-shaped carbon material with a diameter of 42 mm and a thickness of 6 mm. As shown in the drawing, this shape is matched to the size of the part of the metal formwork that comes into contact with the top of the mouth of the bottle glass. Next, on the surface of the carbon material obtained in this way, Si/C=
0.6 of silicon was placed, and under the same conditions as in Example 1, silicon was permeated into the entire carbon material and reacted. The surface in contact with the glass was then polished and smoothed.

A formwork incorporating the silicon carbide-reinforced carbon material formwork parts thus obtained and a conventional metal formwork were used to manufacture bottle glass for three months, and the performance of the two was compared.

The conditions for manufacturing bottle glass for the bottle glass mold are as follows.

The temperature of the semi-molten glass in contact with the part is about 500 to 600°C. Bottle glass is manufactured at a rate of 20 times/minute, that is, the semi-molten glass is brought into contact with the part at a rate of 20 times/minute, and after curing, mold release is repeated.

Comparison of performance (i) Bottle glass manufactured using molds incorporating silicon carbide-reinforced carbon material parts has lower performance compared to bottle glass manufactured using metal molds.
The proportion of cracks in the roof of the mouth decreased from approximately 5% to 2%.

(ii) In the case of incorporating the silicon carbide-reinforced carbon material parts according to the present invention, there was no major damage to the parts even after three months had passed, and it was possible to continue using the parts, similar to the metal formwork.

These results show that when the bottle glass mold of the present invention is used, the incidence of defective products with cracks is approximately 1/2 that of those using conventional molds made of metal materials.
I was able to reduce it to 5.

[Effects of the Invention] As can be understood from the above explanation and the results of the examples, the bottle glass mold of the present invention has a thermal conductivity lower than that of metal materials, and has the wear resistance of silicon carbide and the ease of carbon. Because it is constructed by incorporating parts made of carbon material reinforced with silicon carbide, which also has peelability, into the required parts of the formwork, it suppresses the occurrence of cracks during the production of bottle glass, and is comparable to those made of metal materials. It has the effect of exhibiting durability.

[Brief explanation of drawings]

The drawing is a partial cross-sectional view showing an example of the structure of a mold for bottle glass according to the present invention. 1, 2... Formwork made of metal material, 4... Formwork part made of carbon material reinforced with silicon carbide.

Claims (1)

[Claims] 1. A formwork for bottle glass characterized by incorporating a part made of a carbon material reinforced with silicon carbide into a part of the formwork.