JPH08259244A - Glass forming mold - Google Patents

Abstract

PURPOSE: To prevent galling of the contact surfaces of the mold components at the time of forming glass from occurring and to prolong the service life of a mold by forming a specific coating film on at least one side of contact surfaces of every two mold components in contact with each other in the prescribed glass forming mold. CONSTITUTION: In this glass forming mold (for finishing) whose surface is coated with a stable alumina coating film thereby eliminating the need of a releasing agent applied on the surface in contact with glass, a solid lubricant coating film 1 contg. at least one of tungsten disulfide, molybdenum disulfide, boron nitride and graphite is formed on at least one of contact surfaces of every two mold components in contact with each other. For example, the engaging part of a crude mold 2 of a forming mold of a small-sized bottle 5, the contact surfaces of the crude mold 2 and a baffle 3 in contact with each other and the contact surfaces of the crude mold 2 and a mouth mold 4 in contact with each other are coated with a mixed slurry consisting of tungsten disulfide, graphite and water glass used as an inorganic binder and then, the resulting coated contact surfaces, etc., are heated and dehydrated and thereafter, further heated to form the solid lubricant coating films 1 on these contact surfaces, etc.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Molds for glass molding are generally manufactured from cast iron, heat-resistant steel, etc., and an oil-based mold release agent mainly composed of graphite is regularly used on the surface of the mold during operation in order to enhance the mold releasability from glass. Is applied to. This release agent worsens the working environment,
Further, since there is a problem that graphite powder adheres to the surface of glass products, it has been desired to devise a so-called oilless mold that does not use a mold release agent. In order to solve this, Japanese Patent Laid-Open No.
-10079, JP-A-6-158269 and JP-A-6-158269.
JP-A-279944 discloses an alloy for a glass molding die, which has improved mold release property by forming a stable alumina film on the surface of the die.

[0003]

However, when the above-mentioned metal mold made of alloy having an excellent releasability is actually used without oil coating, galling occurs at the contact surface between the mold components, and The smooth operation and the dimensional accuracy of the glass product could not be obtained, and the life was the same as or shorter than that of the conventional mold. The present invention provides a mold having self-lubricating property on the contact surface between mold components and having a long life even in the operation without oil coating. In molds that use conventional mold release agents, the oily mold release agent applied to the mold surface flows out to the contact surface between mold component parts, which eventually acts as lubricating oil to prevent galling. It had been. However, in the case of alloy molds having excellent mold releasability as disclosed in the above-mentioned JP-A-6-0079, JP-A-6-158269, and JP-A-6-279944, mold components are used because no oil-based mold release agent is used. Lubrication components were not supplied to the contact surfaces of the molds and galling occurred, resulting in shortening the life of the mold.

Further, there are a rough mold and a finishing mold in a glass molding mold, and even in the case of a mold made of a conventional material, a mold releasing agent is not applied to the finishing mold in order to prevent adhesion of the mold releasing agent to the surface of the glass product. In this case as well, galling of the contact surfaces between the mold components shortens the mold life. We have
A new glass molding die that forms a stable alumina film on the mold surface and a finishing glass molding mold that does not apply a mold release agent to the contact surface with the glass. We conducted long-term research on the lubrication method and came to the solution.

[0005]

That is, in the first aspect of the present invention, the contact surface between the mold components contains at least one of tungsten disulfide, molybdenum disulfide, boron nitride and graphite. A glass molding die characterized by having a solid lubricating film. A second invention of the present invention is to form a recessed portion on a contact surface between mold component parts to embed a self-lubricating solid substance containing at least one of tungsten disulfide, molybdenum disulfide, boron nitride and graphite. However, the surface of the self-lubricating solid substance comes into contact with the mating surface, which is a mold for glass molding.

[0006]

In the first aspect of the present invention, by applying a coating agent in which a solid lubricant such as tungsten disulfide or graphite is dissolved in an inorganic binder such as water glass to the contact surfaces of the mold components and then heat treating, We have succeeded in forming a solid lubricant film that is strong and does not cause peeling or chemical changes even after long-term use, and enables long-term use of the mold even in oil-free operation. As a lubricant component, solid lubricants such as tungsten disulfide, molybdenum disulfide, boron nitride,
The reason for selecting at least one type from graphite is that the temperature during use is 200-400 ℃ for general lubricating oils and greases.
This is because the solid lubricants cannot be used for a long period of time due to evaporation and decomposition and deterioration, whereas these solid lubricants have excellent thermal stability and do not deteriorate even after a long period of use. The reason for using an inorganic binder such as water glass as the binder is that the adhesiveness with the mold, the chemical stability at the operating temperature, and the non-reactivity with the solid lubricant are taken into consideration. FIG. 1 shows a conceptual diagram of the present invention.

The self-lubricating solid substance used in the second invention is a composite material in which a solid lubricant such as tungsten disulfide or molybdenum disulfide is dispersed in a metal, which is chemically stable at the working temperature of the mold. Must. Further, the self-lubricating solid substance should be uniformly arranged so as to cover the entire contact surface between the mold components. Figure 2
A conceptual diagram of the present invention is shown in FIG.

[0008]

EXAMPLES Examples will be shown below in order to explain the present invention in more detail. Table 1 collectively shows examples of the first invention and the second invention of the present application. Example 1 Cu-Al disclosed in JP-A-6-279944
-Fe alloy (50% Cu-12% Cr-7% Al-17
% Ni-0.05% (La + Ce) -remainder Fe) made of a small bottle molding die as shown in FIG. 1, such as rough mold 2 fitting part, rough mold 2-baffle 3 contact surface, rough mold 2-port Apply 60% by volume of tungsten disulfide, 20% by volume of graphite, and the balance of water glass to the contact surface of the mold 4, and
After dehydration at 50 ° C. for 60 minutes, the temperature was raised to 400 ° C. in the air and kept for 60 minutes to obtain a solid solid lubricating coating 1. Using this solid lubricant-coated mold, a continuous molding test of the small bottle 5 without oil was conducted. As a result, the contact surface was sound after bottle molding for about 120 hours, and it was possible to use it thereafter. In addition, since the release agent did not adhere to the bottle, the quality of the bottle was superior to the bottle quality obtained by using the conventional oily release agent.

[0009]

[Table 1]

Example 2 The same as in Example 1, a small bottle molding die made of Cu-Al-Fe alloy was fitted with the rough mold 2, the rough mold 2-the contact surface of the baffle 3, and the rough mold 2.
Forming a recess as shown in FIG. 2 on the contact surface of the die 4;
30% by volume tungsten disulfide-30% by volume graphite 40% by volume (Cu-10% Sn-27%)
The Ni) alloy composite sintered body was embedded as the self-lubricating solid substance 1 so that the top portion thereof coincided with the contact surface. Further, the fitting portions of the rough molds 2 were alternately arranged on both rough molds in order to enhance the holding power of the self-lubricating solid substance. Using the mold in which this self-lubricating solid substance was embedded, a continuous molding test of the small bottle 5 without oil was conducted. As a result, the self-lubricating solid substance buried in the early stage of the molding operation forms a transfer layer on the mold contact surface, and this transfer layer exhibits the same solid lubricating film effect as in Example 1 for about 120 hours. The contact surface was sound after the bottle was molded, and it was possible to use it thereafter. In addition, since the release agent did not adhere to the bottle, the quality of the bottle was superior to the bottle quality obtained by using the conventional oily release agent.

Example 3 Finishing mold 6 of a small bottle molding die made of cast iron as shown in FIG.
A mixed slurry consisting of 60% by volume of tungsten disulfide, 20% by volume of graphite and the balance of water glass was applied to the fitting portion and the contact surface of the finishing die 6-bottom die 7 and dehydrated at 150 ° C. for 60 minutes, and then the atmosphere. A solid solid lubricating coating 1 was obtained by raising the temperature to 400 ° C. and holding it for 60 minutes. Using this solid lubricant-coated mold, a continuous molding test of a small bottle without oil was conducted. As a result, the contact surface was sound after bottle molding for about 120 hours, and it was possible to use it thereafter.

Comparative Example 1 A continuous molding test of a small bottle without oil was carried out using a rough mold of a small bottle molding die made of the same Cu-Al-Fe alloy as in Example 1 but not provided with a solid lubricant. went. As a result, about 1
After the bottle molding for 1 hour, galling occurred on the contact surface of the rough mold 2 and the mouth mold 4, the smooth operation and the dimensional accuracy of the bottle product could not be obtained thereafter, and the mold was replaced by the bottle molding for about 12 hours.

Comparative Example 2 A continuous molding test of a small bottle by applying an oil release agent was conducted using a rough mold of a conventional cast iron small bottle molding die. As a result, the contact surface between the mold components was sound due to the effect of the release agent flowing out even after the bottle was molded for about 60 hours.
It was necessary to apply the release agent every ~ 30 minutes, and the bottle quality was inferior as compared with the bottles of Example 1 and Example 2 due to the adhesion of the release agent to the bottle. As a result of continuous bottle molding, about 7
After bottle molding for 5 hours, the bad influence on the quality of the bottle due to the release agent accumulation became great, and the mold was replaced.

Comparative Example 3 A continuous molding test of a small bottle was carried out using a conventional cast iron mold for finishing in which an oil-based mold release agent was not used on the contact surface with glass. As a result, after the bottle molding for about 20 hours, the finishing mold 6-
A galling occurred on the contact surface of the bottom die 7, and the smooth operation and the dimensional accuracy of the bottle product could not be obtained thereafter, and the die was replaced by the bottle molding for about 23 hours. In this example, a glass bottle molding mold was shown as the glass molding mold,
The present invention is not limited to this, and can be widely applied as a glass molding die in the same use environment as that of this embodiment, for example, for building materials, tableware such as cups, and the like.

[0015]

As described above, according to the present invention, a mold for glass molding for forming a stable alumina film on the mold surface and a glass mold for finishing without applying a release agent to the contact surface with glass. By applying a solid lubricating substance to the contact surfaces of the mold components of the mold, it is possible to prevent galling of the contact surfaces during glass molding, and to obtain a glass molding mold with a long life.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a glass molding die in which a solid lubricating film is applied to the contact surfaces of rough die component parts.

FIG. 2 is a conceptual diagram of a glass molding mold in which a self-lubricating solid substance is embedded in a contact surface between rough mold components.

FIG. 3 is a conceptual diagram of a glass molding die in which a solid lubricating film is applied to the contact surface between the finishing die components.

[Explanation of symbols]

 1 Solid Lubricant 2 Glass Bottle Mold Rough Mold 3 Glass Bottle Mold Baffle 4 Glass Bottle Mold Mouth 5 Molded Bottle 6 Glass Bottle Mold Finishing Mold 7 Glass Bottle Mold Bottom Mold

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Akato 46-59 Nakahara, Tobata-ku, Kitakyushu, Fukuoka 46-59 Nippon Steel Corporation Machinery & Plant Division (72) Koji Hirata Tobata-ku, Kitakyushu, Fukuoka 46-59 Nakahara 46-59 Nippon Steel Corporation Machinery & Plant Division (72) Inventor Shigeki Ogura 46-59 Nakahara 46-59, Nippon Steel Corporation Kitakyushu City, Fukuoka Prefecture

Claims (2)

[Claims] 1. A glass molding die in which a mold release agent is not applied to the contact surface with glass by forming a stable alumina film on the die surface and a finish in which a release agent is not applied to the contact surface with glass. In the glass molding die of, at least one side of the contact surface between the die component parts, tungsten disulfide,
A glass molding die, wherein a solid lubricating film containing at least one of molybdenum disulfide, boron nitride, and graphite is formed. 2. A mold for glass molding in which a release agent is not applied to the contact surface with glass by forming a stable alumina film on the surface of the mold, and a finish without application of a release agent in the contact surface with glass. In the glass molding die of, at least one of tungsten disulfide, molybdenum disulfide, boron nitride, and graphite is formed by forming a recess on at least one side of the contact surface between the mold components. A mold for glass molding, wherein a self-lubricating solid substance containing is embedded, and the surface of the self-lubricating solid substance is in contact with a mating surface.