JPH0585746A - Metallic mold for glass subjected to vapor deposition treatment - Google Patents

Abstract

PURPOSE:To obtain a metallic mold which improves mold parting, can extremely decrease the coating operations of oil and is free from defects, such as peeling, by coating the product molding surface of the metallic mold for glass with a material which is to be deposited by evaporation and has a good release property from products and a good thermal conductivity. CONSTITUTION:The product molding surface of the metallic mold for glass is deposited with the above-mentioned material to be deposited by evaporation and generally a material which has a high m.p. and with which the good smoothness to glass products is obtainble, in such a manner that the thin film of several microns can be obtd. The materials to be deposited by evaporation are adequately, for example, Ni, Cr, Pt, V, Mo, W, TiC, SiC, WC, graphite diamond vapor CVD, reactive vacuum vapor deposition and Chemical vapor deposition method, such as vacuum vapor deposition and low-pressure CVD, reactive vacuum vapor deposition and physical vapor deposition methods, such as sputttering, are adopted as the vapor deposition means. The parting of the product is extremely well executed even if the oil to be coated for the purpose of parting is extremely decreased by using such metallic mold. The speed up of mass production is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold used for glass molding, and more specifically, a physical vapor deposition (PVD) method or a chemical vapor deposition method (PVD) for improving the releasability from a glass element. The present invention relates to a glass mold having a coating film formed by CVD.

[0002]

2. Description of the Related Art A glass mold of a bottle making machine will be described as an example. The mold of the bottle making machine is constructed by opening and closing a symmetrical one that is divided in half in the vertical direction. Since a glass element with a high temperature of 1000 to 1200 ° C. is supplied, heat is generated even if the high temperature and cooling are repeated. It is made of cast iron with a small expansion and good mold release. To this glass mold, a glass raw material such as silica sand, limestone, soda ash, etc. melted at about 1600 ° C. in a melting furnace is supplied from the feeder as a constant gob.

FIG. 1 shows a glass mold used in a bottle making machine.
As shown in FIG. 3, the gob is directly supplied from the feeder to the combination mold including the rough mold 1, the mold 2a for molding the mouth portion, the plunger 2b, the guide ring 2c, and the funnel 2d for molding the bottom portion, and the baffle 2e. The finishing mold 3 includes a bottom mold 4a for molding a rough bottle-shaped semi-finished product taken out of the combination mold into a predetermined bottle shape and a blow head 4b. Reference numeral 5 is a reversing device for moving a rough bottle-shaped semi-finished product from the rough mold 1 to the finishing mold 3.

If the mold release of the product is not good, invisible minute cracks are generated in the product, resulting in a defective product. Although defective products are detected and eliminated by the optical bending inspection in the next process, in order to suppress the occurrence as much as possible, at present, oil mixed with a substance compatible with solid lubrication such as carbon is applied to the product molding surface of the mold. It is necessary to carry out a coating operation to coat and improve the mold release.

However, if the oil application work is not performed in a short time while the product is taken out from the mold and the mold is opened, the mold is closed to receive the next supply of the hump, so that it is instantaneous. Moreover, it is necessary to do it accurately. This coating operation needs to be performed once for every several hundred product removals. Therefore, the coating work requires skill, the workability with mental and physical fatigue is poor, and the production system incorporates the coating time, which is one of the factors that hinder the improvement of productivity in mass production. There is. Therefore, as a means for reducing the number of times of oil application, a glass mold which has been subjected to a plating treatment or the like is used.

[0006]

However, even in the case of a glass mold which has been subjected to a plating treatment, for example, the resistance to rapid heating and rapid cooling that occurs during the glass forming process is weak and peeling of the plating substance itself occurs. However, the number of times oil is applied is once every several hundred times, and the oil is formed by applying oil repeatedly. Further, since the carbon layer has a vicious circle in which partial peeling occurs, workability is still poor, and this has been a factor that reduces productivity. The present invention has been made in view of the above problems, the mold release is good and the oil application work is extremely reduced, and the defects such as peeling are largely removed.
It is an object of the present invention to provide a glass mold which has been vapor-deposited for improving productivity and improving the working environment.

[0007]

In order to solve the above-mentioned problems, the present invention is a vapor deposition method in which a product molding surface of a glass mold is coated with a vapor deposition substance having good mold releasability from the product and good thermal conductivity. This is what constitutes a treated glass mold.

[0008]

According to the present invention, since the vapor deposition material having a good mold release property is adhered as a coating film to the product molding surface of the glass mold, the smoothness of the vapor deposition surface is high and the mold releasing Even if the amount of oil applied is extremely reduced, the product is released from the mold well.

[0009]

Embodiments of the present invention will be described. As the vapor deposition means, for example, in a vacuum vapor deposition process, a glass mold and an evaporation substance are housed in a vacuum container, the interior of the container is evacuated, and then the evaporation substance is heated to its melting point or higher. In order to obtain a good vapor-deposited coating, as a cleaning treatment for removing the gas and dirt adsorbed on the die-deposited surface in advance, for example, an ion bombardment method, or to increase the adhesion strength between the vapor-deposited coating and the substrate, Etching or the like is also performed to appropriately form fine irregularities on the surface to be vapor-deposited, that is, the product molding surface, for processing. Further, in order to improve the adhesion between the vapor-deposited coating and the surface to be vapor-deposited, a means for preheating the glass mold is appropriately performed.

The vapor deposition material is generally a material having a high melting point and smoothness with glass products, although it varies depending on the glass raw material, molding conditions and the like. For example, nickel (Ni), chromium (Cr), platinum (Pt), vanadium (V), molybdenum (Mo), tungsten (W), titanium carbide (TiC), silicon carbide (SiC), tungsten carbide (WC), Graphite, diamond, cubic boron nitride (c-BN), titanium nitride (TiN), aluminum oxide (AL ₂ O ₃ ), silicon nitride (Si
₃ N ₄ ), titanium boride (TiB ₂ ), boron carbide (B
₄ C), hafnium carbide (HfC) and the like are suitable.

The above vapor deposition material is adhered to the vapor deposition surface of the glass mold so as to form a thin film of several microns to form a glass mold. When this glass mold that has been subjected to this vapor deposition treatment is applied to a bottle-making machine, the smoothness of the vapor deposition surface is improved and the mold release from the glass product is improved, and as in the past, oil that promotes mold release is applied. The number of times can be drastically reduced. Therefore, the coating work with poor workability is eliminated, the labor is not required, and the mass production can be speeded up without adopting a production system with a shorter coating time, greatly improving productivity. It contributes.

Vacuum evaporation, low pressure CVD,
In addition to chemical vapor deposition methods such as plasma CVD, physical vapor deposition methods such as reactive vacuum vapor deposition methods, sputtering methods, and ion plating methods are appropriately adopted according to the characteristics of the vapor deposition material. The cast iron material (FC) used for the glass mold contains 2 to 4% of carbon,
When direct vapor deposition is difficult, a method of depositing a plating layer first and then vapor deposition may be used. In addition to cast iron, copper alloys, iron (for example, S45C), and stainless steel materials (for example, SUS403) are also used for the glass mold, and it goes without saying that vapor deposition means are also effective for these.

[0013]

Since the present invention is constructed as described above,
On the product molding surface of the glass mold, a vapor deposition substance with good mold release property and good thermal conductivity is adhered as a coating film,
The smoothness of the vapor-deposited surface is improved, the mold release from the glass product is improved, and the number of times of applying the oil that promotes the mold release as in the past is drastically reduced. Therefore, the coating work having poor workability is almost eliminated, and the mass production can be speeded up without adopting the production system in which the coating time is inserted, which leads to the improvement of the productivity.

[Brief description of drawings]

FIG. 1 is a schematic view of a glass mold according to a conventional example.

[Explanation of symbols]

 1: rough type 2a: mouth type 2b: plunger 2c: guide ring 2d: funnel 2e: baffle 3: finishing type 4a: bottom type 4b: blow head 5: reversing device

Claims (1)

[Claims] 1. A vapor-deposited glass mold, characterized in that the product molding surface of the glass mold is coated with a vapor-deposition substance having good releasability from the product and good thermal conductivity.