JPH03279223A - Feeding method for molten glass mass - Google Patents

Abstract

PURPOSE:To obtain a glass molded product of good quality through such processes that using a supporting tool subjected to vibrations of each specified frequency and amplitude, a molten glass mass after cut is supported, thereby increasing the thermal contact resistance between the glass mass and supporting tool to effect suppressing glass mass cooling. CONSTITUTION:A specified amount of glass mass is fed from a glass melting furnace 1, and the glass extruded through an opening 2 is cut to form a lump. This lump is allowed to fall into a mold located thereunder and molded. The glass left at the opening 2 is held by a supporting tool 5 being in vibration at a frequency of 1-1000Hz and an amplitude of 0.2-50nm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for supplying a molten glass gob.

[Prior Art] Conventionally, a method for supplying molten glass gobs involves cutting a bar-shaped stream of molten glass pushed out by a plunger from an orifice provided at the bottom of a glass melting furnace using a cutting machine, and directly feeding the cut gobs into a mold. The method was to let it fall.

When the gob is dropped directly into the mold, the molten glass has a low viscosity, so the glass flow drips from the orifice between the time the gob is cut by the cutter and the next time the gob is cut, resulting in an elongated gob shape. Alternatively, there is a problem that a part of the gob is missing and molding becomes impossible.

For the purpose of solving this problem, Japanese Patent Application Laid-Open No. 61-25692
No. 6 proposed a method of holding the glass flow near the orifice and supplying the gob using a support plate. However, in order to prevent the glass from burning onto the support plate, the support plate is cooled, and the bottom surface of the gob is cooled by contact with the support plate and hardens, so when it is molded, the hardened part is inevitably formed. Scars or unevenness may remain on the product, or the surface may become uneven due to these embeddings, and polishing work is required to remove these defects.

[Problems to be Solved by the Invention] An object of the present invention is to overcome the above-mentioned drawbacks of the prior art. That is, it is an object of the present invention to provide a gob feeding method that eliminates surface flaws caused by cooling and makes it possible to manufacture a molded product having a surface that does not require polishing work to remove surface flaws.

[Means for Solving the Problems] The present invention provides a method for supplying a fixed amount of glass gobs using a glass melting furnace, in which the glass gobs to be supplied are supported by a vibrating support. This is a method for supplying a molten glass gob, and a desirable embodiment is a method in which a certain amount of molten glass gob is supplied by cutting the molten glass flowing out from the lower part of a glass melting furnace and dropping a certain amount of molten glass gob. After cutting the lump, the cut surface of the lower end of the molten glass lump to be cut next is set at a frequency of 1 to I.
The molten glass gob is supported by a support that vibrates at KHz and an amplitude of 0.2 to 50 mm, and the shape of the molten glass gob is adjusted.Then, the support is removed from the molten glass gob, the upper part of the molten glass gob is cut, and the gob is fed into a mold. It is an object of the present invention to provide a method for supplying a molten glass gob characterized by the following.

The invention thus essentially consists in supporting a molten glass gob on a support plate under vibration.

Here, the support used in the present invention may be of any shape as long as it supports the molten glass lump, and a plate-shaped support plate is usually sufficient, but depending on the purpose, a container with a storage part may be used. It may be something like that.

The degree of the applied action can be determined depending on the weight and temperature of the glass gob, but the effect is usually recognized at a frequency of 1 to IKHz and an amplitude of about 0.2 to 50 mm.

Here, the frequency and amplitude are smaller than the above range (then,
The shaping effect caused by vibration is lost, and defects begin to appear in the molded product. On the other hand, if it is larger than the above range, the glass gob will be significantly deformed due to the vibration of the support plate, making it impossible to supply gobs with a stable shape.

Incidentally, it is preferable that the vibration be applied constantly while the glass gob is being supported, but it is of course possible to apply the vibration occasionally. Generally, it is preferable to vibrate the support plate already at the time of contact with the hot glass gob.

[Function] As explained above, when the present invention is used, the glass substrate left in the orifice after cutting the glass flow is supported by the support plate until the plunger descends to push the glass flow out of the orifice. Although it is supported, the supporting plate has a frequency of 1~
By vibrating at I KHz and an amplitude of 0.2 to 50 mm, the contact time between the gob and the support plate is shortened, and the contact thermal resistance between the gob and the support plate is increased. This has the effect of suppressing cooling caused by contact with. The above action suppresses cooling due to contact of the bottom surface of the gob with the support plate, making it possible to supply gobs suitable for manufacturing molded products without defects due to gob cutting.

[Example] The present invention will be further described based on the drawings. FIG. 1 is a sectional view of an apparatus according to the method of the present invention, and FIG. 2 is a side view thereof.

In Fig. 1, 1 is a melting furnace, 2 is an opening, and 3 is a plunger, and the plunger 3 moves up and down intermittently to push a certain amount of molten glass from the opening 2 with each operation. put out. The glass substrate extruded from the opening 2 is cut by a cutting blade 4 provided below the opening to form a gob.

After cutting the glass substrate, the cutting blade 4 is moved back. Opening 2
The remaining glass is vibrated by a vibrator 6, as shown in FIG. 1, until the plunger is then lowered and the glass base is pushed out from the opening. It is held by a support plate 5, which is a support provided below the melting furnace. At this time, since the support plate 5 is vibrated up and down by the vibrator, it holds the glass base while intermittently contacting the glass base so as to adjust the shape and cut surface of the glass gob.

As shown in FIG. 2, the support plate 5 is connected to the end of the piston rod 11 of the cylinder 8 provided in the support part 7 by a link, and as the link moves along the guide 13, the support plate moves the pivot 9. Roll around as the center. The support plate indicated by a solid line shows a state where the remaining glass base is held after cutting the glass base, and the position indicated by a dotted line indicates a state where the support plate is evacuated to a position where it does not prevent the cut gob from falling. After a certain amount of time has elapsed and a certain amount of glass base material has been formed, the support plate is separated from the glass gob and cut to release the glass gob, thereby causing the glass gob to fall into the mold set below.

In such an apparatus, when glass gobs were supplied under the conditions shown below, no scars or irregularities were observed on the surface of the molded product made from the supplied glass gobs, and a good molding surface was obtained.

In contrast, scars and unevenness remained on the surface of the molded product made from the glass ingots supplied under conditions where the support plate, which is a support tool, was not vibrated.

Conditions: Temperature of supplied glass gob 1000°C Weight of supplied glass gob 9 kg Support plate shape φ 100 mm The glass molded product manufactured by this method can have a good finished surface that does not require polishing.

In particular, since heat transfer from the glass substrate to the support plate due to the vibration of the support plate can be suppressed, there is no need to cool the glass with air to prevent the glass from burning onto the support plate as in the past, resulting in high-quality glass molded products. enables the production of

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a gob supply device according to an embodiment of the present invention, and FIG. 2 is a side view of the same device, in which 1 is a melting furnace, 2 is an opening, 3 is a plunger 4 is a cutting blade, 5 is a support plate, 6 is a vibrator, 7 is a support part, 8 is a cylinder, 9 is a pivot,
l. 11 is a rod, 11 is a piston rod, 12 is a link, and 13 is a guide. Diagram: Takuzu

Claims (1)

[Claims] 1. A method for supplying a fixed amount of glass gobs from a glass melting furnace, characterized in that the glass gobs to be supplied are supported by a vibrating support. How to feed the lumps. 2. The method for supplying a molten glass gob according to claim 1, wherein the glass gob to be supplied has a cut surface at the bottom, and the cut surface is prepared by a vibrating support. 3. The support that supports the glass lump has a vibration frequency of 1 to 1K.
The method for supplying a molten glass gob according to claim 1, wherein the molten glass gob is vibrated at a frequency of Hz and an amplitude of 0.2 to 50 mm. 4. In the method of cutting the molten glass flowing out from the lower part of the glass melting furnace and dropping and supplying a certain amount of molten glass lumps, the molten glass lump that is to be next subjected to cutting after cutting a certain amount of molten glass lumps. The cut surface of the lower end is vibrated at a frequency of 1 to 1K.
The molten glass gob is supported by a support that vibrates at Hz and an amplitude of 0.2 to 50 mm, and the shape of the molten glass gob is adjusted.Then, the support is removed from the molten glass gob, the upper part of the molten glass gob is cut, and the gob is fed into a mold. A method for supplying a molten glass gob according to claim 1, characterized in that: