JPH0616430A - Die for glass bottle molding - Google Patents

Abstract

PURPOSE:To shorten the starting time when the molding is started, in a die for glass bottle molding and to improve the yield of product. CONSTITUTION:All parts constituting the die for glass bottle is composed of metallic materials whose thermal conductivities are <=0.07cal/cm.sec. deg.C and also the parts, which are subjected to higher thermal load at the time of molding the glass bottle among the whole parts, are arranged side by side with metallic materials whose thermal conductivities are >=0.9cal/cm.sec. deg.C, thus to constitute a combined structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass bottle molding die.

[0002]

2. Description of the Related Art As shown in FIGS. 8 (a), 8 (b) and 9, each part of a conventional glass bottle mold has a funnel 5,
It comprises a rough mold 4, a mouth mold 6, a plunger 11, a baffle 7, a finishing mold 8, and a bottom mold 3. During molding of the glass bottle, these parts have different contact times with the high temperature glass material, and the molding surface temperature of each part is different due to the difference in shape and thickness of each part.

Generally, since the contact time of the mouth die, the plunger and the bottom die is longer than that of other parts, the molding surface temperature becomes higher accordingly. This high molding surface temperature means
It is not preferable in order to quickly remove the retained heat of the glass bottle to be molded and to secure a high molding speed.

Therefore, the material for each component of the conventional glass bottle mold has a high thermal conductivity of 0, which is suitable for a mouth mold, a plunger, a bottom mold, etc., in which the above-mentioned heat load is high and the molding surface temperature becomes high during molding. All parts are selected and used based on materials of 1 to 0.15 cal / cm · sec · ° C, such as cast iron materials and Cu-Ni alloys. In addition, selection and use of different materials having different thermal conductivities in combination with each other have not been performed because a fitting failure occurs due to a difference in thermal expansion during molding due to a difference in material.

[0005]

When the glass bottle is molded at the time of start-up, the molding surface temperature of each part of the glass bottle mold is low because it is room temperature. Since a glass material having a high temperature is rapidly cooled by the mold having a low molding surface temperature, the stretchability of the glass material is significantly deteriorated, and as a result, an uneven thickness defect occurs in the molded glass bottle and the product quality is deteriorated. . Therefore, conventionally, at the time of start-up at the time of molding, a warm glass material is warmed up by passing a high-temperature glass material through the mold until each component reaches a target molding surface temperature.

However, as described above, all of the components constituting the conventional glass bottle mold have a high heat load during the molding of the glass bottle so as to secure a high molding speed in order to improve the productivity of the glass bottle. Since it is a material with a high thermal conductivity that conforms to, the high molding speed at the time of normal operation is satisfied, but at the time of start-up during glass bottle molding, for example, a rough mold with a low heat load, a finishing mold, etc. It takes a lot of time to reach the target molding surface temperature.

Further, the glass bottle molded from the glass material by the time the temperature reaches the target molding surface temperature is unsuitable as a product due to the uneven thickness defect as described above, and the overall yield of the glass bottle product is significantly reduced. is doing.

[0008]

A glass bottle molding die of the present invention is a glass bottle molding die comprising a funnel, a rough die, a mouth die, a plunger, a baffle, a finishing die and a bottom die. The thermal conductivity of all the above parts is 0.07ca
l / cm ・ sec ・ ° C or less Metallic material, and the thermal conductivity of 0.90 cal / cm ・ sec ・ ° C or higher for all the above-mentioned parts that have high heat load when molding glass bottles It is characterized by having a combined structure with the.

[0009]

In the selection of the materials of all the parts constituting the glass bottle molding die, the material of the entire die is thermally conducted on the basis of the parts having a low heat load when molding the glass bottle, for example, the rough mold and the finishing mold. A material having a low thermal conductivity is selected, and a component having a high heat load, such as a one-sided mold or a bottom mold, has a composite structure of the selected material and a material having a high thermal conductivity.

Since the material of the entire mold is selected to have a low thermal conductivity based on the parts having a low heat load when molding the glass bottle, when starting the glass bottle at the time of molding,
Compared with conventional materials, the time to reach the target molding surface temperature is greatly shortened. Further, by using such a composite structure, a high molding speed comparable to that of conventional materials can be secured during normal operation.

[0011]

EXAMPLES Referring to Table 1 and FIGS. 1 to 7, the conventional example 1,
2, Comparative Examples 1, 2, 3 and Examples 1, 2, 3 of the present invention will be described. Using the composition and material of the mold shown in Table 1, a glass bottle for drink was molded on an actual glass bottle molding line.

[0012]

[Table 1]

[0013]

[Table 2]

The required start-up time at the time of molding shown in Table 1 is the time required for all the parts constituting the mold to reach the target molding surface temperature, and whether the parts have reached the molding surface temperature. It was judged based on the quality of the molded glass bottles, specifically, the size and shape. Further, the maximum production amount after the start-up refers to the maximum production amount that can be produced after the start-up without causing quality defects such as uneven thickness and deformation of the glass bottle that is molded during normal molding.

Comparative Example 2, Example 1 of the present invention, Example 2,
In Example 3, the parts of the mold having the composite structure are the mouth part and the bottom part, and FIG. 1 shows the mouth part, where 1 is a base alloy of the mold and has a thermal conductivity of 0.07 cal / cm. -Sec-Used austenitic heat-resisting steel having a carbon content of 0.4% or less, ferritic carbon steel, and 13% chromium steel, which are less than or equal to ° C. Two
In order to increase the production volume of glass bottles after startup, copper was installed and used as a metal to increase the thermal conductivity.

FIG. 3 shows a bottom die part, the material of which is 9 as in the die die base alloy, which is a base alloy of a die, and which has a carbon content of 0.4% or less. And 13% chrome steel and 10 for copper.

As a result of molding a glass bottle for a drink in an actual glass molding line carried out under such conditions, the following results have been clarified from the test results shown in Table 1.

As a base alloy of a glass bottle molding die in order to shorten the time required for start-up at the time of molding, austenitic heat resistant steel having a thermal conductivity of 0.07 cal / cm · sec · ° C or less, ferritic carbon steel And, by using 13% chrome steel and using copper, etc. with a thermal conductivity of 0.90 cal / cm ・ sec ・ ° C or higher to ensure the maximum production amount after startup, which is the same as before, the conventional mold Compared to, the maximum production amount after startup is comparable to the conventional one, and it becomes possible to provide a mold in which the required startup time at the time of molding is greatly shortened, and the moldability of the glass bottle mold is greatly improved. It is possible.

In this embodiment, the composite structure among the components constituting the glass bottle mold was two components, a mouth mold and a bottom mold, but the present invention is not limited to this. Instead, a component having a composite structure may be appropriately selected and used according to the heat load of the mold which varies depending on the shape and size of the glass bottle to be produced or the shape and size of the mold.

For example, when the wall thickness of the rough mold is large and the molding surface temperature becomes too high, the cooling ability is enhanced by disposing copper or the like having high thermal conductivity on the rear surface of the rough mold to form a composite structure. be able to.

Regarding the setting of the shape of the composite structure, the shape and size of the mold for the glass bottle and the mold are configured.
Depending on the values of high and low thermal conductivity of various types of materials, molding conditions (molding speed, temperature of molten glass), etc., ordinary heat transfer analysis is performed and the mold surface of the target component is burnt during molding. The optimum shape may be set so that it does not become too cold or too cold.

Regarding how to install the high thermal conductivity member,
The molding may be carried out at a position where it does not come into contact with the glass having a temperature higher than 1000 ° C. to prevent deformation and melting damage of the mold. 4 and 5 are provided with a notch, and FIG. 6 is provided with a hole, and the cooling effect is further improved by contact with air. FIG. 7 shows an example of another composite structure in the bottom mold.

In the above-mentioned embodiment of the present invention, the thermal conductivity is 0.07 ca as a material for all the constituent parts of the mold for molding a glass bottle in order to shorten the time required for starting at the time of molding.
Although austenitic heat-resistant steel, ferritic carbon steel, 13% chrome steel, etc. having a temperature of l / cm · sec · ° C or less were used, other examples of applications include, for example, aluminum-containing cast iron and aluminum-containing heat-resistant steel.

[0024]

By applying the mold of the present invention to an actual mold for glass bottle molding, compared with the conventional mold, the time required for start-up at the time of molding is greatly shortened and the productivity is improved. Has been confirmed and has great value industrially.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing an embodiment of a mouth mold of a glass bottle mold of the present invention, and FIG. 1B is a vertical cross-sectional view.

FIG. 2 (A) is a horizontal sectional view showing another embodiment of the mouth die of the glass bottle mold of the present invention, and FIG. 2 (B) is a vertical sectional view.

FIG. 3 is a cross-sectional view showing one embodiment of the bottom mold of the glass bottle mold of the present invention.

FIG. 4A is a cross-sectional view showing another embodiment of the mouth die of the glass bottle mold of the present invention, and FIG. 4B is a vertical cross-sectional view.

5A is a cross-sectional view showing another embodiment of the mouth die of the glass bottle mold of the present invention, and FIG. 5B is a vertical cross-sectional view.

FIG. 6A is a cross-sectional view showing another embodiment of the mouth die of the glass bottle mold of the present invention, and FIG. 6B is a vertical cross-sectional view.

FIG. 7 is a cross-sectional view of another example of the bottom mold of the glass bottle mold of the present invention.

8 (A) and 8 (B) are cross-sectional views showing a rough mold manufacturing process of a bottle by blow molding of a conventional bottle making machine.

FIG. 9 is a cross-sectional view showing a case of transferring from a rough die manufacturing process to a finishing process.

[Explanation of symbols]

 1 Mouth type body 2 Mouth type body cooling promoting member 3 Bottom type 4 Coarse type 5 Funnel 6 Mouth type 7 Baffle 8 Finishing type 9 Bottom type body 10 Bottom type body cooling promoting member 11 Plunger 12 Contact surface with molten glass

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroto Imamura 46-59 Nakahara, Tobata-ku, Kitakyushu City Nippon Steel Corporation Machinery & Plant Division

Claims (1)

[Claims] 1. A glass bottle molding die comprising a funnel, a rough die, a mouth die, a plunger, a baffle, a finishing die and a bottom die, all of which have a thermal conductivity of 0.
It is composed of a metal material with a temperature of less than 07 cal / cm ・ sec ・ ℃, and a metal material with a thermal conductivity of 0.90 cal / cm ・ sec A mold for glass bottle molding, which is characterized by having a composite structure.