JPS6221719A - Method for fine-adjustment of weight of molten glass gob - Google Patents

Abstract

PURPOSE:To adjust the weight of molten glass gob easily in high accuracy, by welding a pulling means made of a glass-welding substance to a molten glass gob and pulling out a glass rod from the glass gob. CONSTITUTION:A molten glass gob 1a is placed on a receptor 2, and the molten glass gob 1a is weighed together with the receptor 2. The receptor 2 is placed under the adjusting means 6, and the motor 9 is rotated to lower the pulling means 3 made of a glass-welding substance (e.g. metal) until the lower end of the pulling means 3 is welded with the molten glass gob 1a. The motor 9 is rotated reversely to pull up the pulling means 3. A glass rod is pulled out of the molten glass gob 1a and cut with the cutter 5 at a part near the surface of the molten glass gob 1a. The weight of the molten glass gob 1a can be adjusted accurately by this process and a glass article having high shape accuracy can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for finely adjusting the weight of a molten glass gob, particularly for manufacturing glass products where the amount of balls is extremely limited, such as press-molded optical elements. The present invention relates to a method for supplying a molten glass gob to be used.

[Prior art and its problems 1 The weight of the molten glass lump taken out from the melting furnace depends on the temperature of the molten glass, the diameter of the outflow orifice, the amount of extrusion from the melting furnace, the timing of cutting, etc. It is designed to be properly adjusted.

However, since molten glass is a viscous fluid whose viscosity changes depending on temperature, a weight error of several percent or more may occur even under highly accurate control.

For this reason, if a molten glass gob whose weight has been adjusted using conventional methods is used to press or otherwise form, weight errors will occur, resulting in changes in the wall thickness of the product, protrusion from the mold, etc. There is a problem in that it is extremely difficult to mold optical elements that require high precision in the finished shape.

The present invention has been made in view of the above circumstances, and is made by fusing a pull-out means made of a substance that fuses glass to a lump of molten glass in a softened state, and pulling out a rod-shaped glass from the glass lump. adjustment, and enables the supply of molten glass gobs whose weight is precisely adjusted.
To enable continuous production of glass products with high shape accuracy such as optical elements from molten glass directly from a melting furnace, and to provide a plurality of drawer means and drawer adjustment means for one molten glass lump. By providing
The purpose is to improve work speed).

[Means for Solving the Problems] As described above, the present invention fuses a pull-out means made of a substance that fuses glass to a lump of molten glass in a softened state, and separates the rod-shaped glass from the glass lump. The present invention provides a method for finely adjusting the weight of a molten glass gob, characterized in that the weight is adjusted by pulling out the molten glass gob.

[Function] By the above-mentioned means, the present invention makes it possible to supply a molten glass lump whose weight is adjusted with high precision, and to produce glass products with high shape precision such as optical elements and lenses.

Enables continuous production from molten glass directly from the melting furnace.

Further, by driving a plurality of drawer L stages and drawer 21J adjustment means for one molten glass gob, the work speed is improved.

Further, by using the obtained molten glass gob, it is possible to reduce the processing time of the lens element and the price of the lens element, without using complicated steps such as those employed in the reheat press method, for example.

[Example] Hereinafter, an example of the thermal recording head of the present invention is shown in the accompanying drawings.
This will be explained in detail.

Fig. 1 is a diagram showing the positional relationship between the drawing device and the molten glass gob placed under it, Fig. 2 is a diagram showing the state when the drawing means comes into contact with the molten glass lump, and Fig. 3 is a diagram showing the state when the drawing means is in contact with the molten glass lump. A diagram showing the state when glass is being pulled out in a rod shape from the molten glass lump, and FIG. 4 is a diagram showing the state after the weight yXt:A adjustment is completed.

In the figure, the number l is a molten glass lump, the molten glass lump at the time of weight adjustment of the molten glass lump 1 is designated as la, and the molten glass lump after weight adjustment is designated as lb.

A saucer 2 with a known weight for holding the molten glass gob 1 is provided below the molten glass gob 1.

When the tip of the drawing means 3 is applied to the upper surface of the molten glass gob 1, the molten glass gob 1 is peeled off from the molten glass gob 1 by the amount of glass 4 to be melted under the melting temperature conditions.

The drawing means 3 is made of a material that easily fuses with glass, such as metal.

At this time, the bar-shaped glass drawn out by being fused to the drawing means 3 is designated as 4a, and the bar-shaped glass torn off from the molten glass lump ib is designated as 4b.

Then, as shown in FIG. 4, lift up the drawer means 3,
A bar-shaped glass 4b is cut with a cutter 5.

In this embodiment, a drawer adjustment means 6 is used especially to move the drawer means 3 up and down.

As detailed in FIG. 1, the drawer adjusting means 6 is
A rack gear 7 connected to the pull-out means 3, a pinion gear 8 for moving the rack gear 7 up and down, a variable speed gear 9 for rotating the pinion gear 8, and a control (not shown) for controlling the rotation of the variable speed motor 9. Consists of equipment.

Next, the operation of this embodiment will be explained.

A molten glass lump L is placed on a saucer 2 using a well-known method.

At this time, the weight of the molten glass gob 1 is always set to be slightly heavier than the stated weight.

At this time, the lower limit value of the varying weight need only be greater than the desired weight, and the upper limit value does not need to be particularly limited, so a well-known method is followed.

Then, the molten glass lump 1 is weighed together with the saucer 2.

At this time, since the weight of the receiver 2 is known, the weight of the molten glass gob 1 can be easily determined.

Next, as shown in FIG. 1, the molten glass gob 1 and the receiver 2 are placed under the drawer adjustment means 6, and the motor 9 is rotated by a command from the control mechanism.

The rack gear 7 and the drawer means 3 attached thereto are lowered via the pinion gear 8 attached to the output shaft of the motor 9.

In this way, the tip of the drawing means 3 comes into contact with the molten glass lump l, but the tip of the drawing means 3 and the molten glass lump 1 come into contact with each other.
Hold a until fused.

Thereafter, by rotating the motor 9 in the opposite direction to the aforementioned rotation, the bar-shaped glass 4a whose tip end is fused to the drawing means 3 can be drawn out from the molten glass lump 1a as shown in FIG.

Next, as shown in FIG. 4, the bar-shaped glass 4a is cut near the surface of the molten glass lump 1a by the cutter 5.

In this way, the cutter 5 separates the molten glass lump ib and the rod-shaped glass pieces 4b.

In this embodiment, the contact area between the molten glass gob 1a and the drawing step is determined by the shape of the tip of the drawing means 3 and the drawing speed.

In other words, it is determined by the rotational speed of the motor 9 and the distance to be pulled out.

Then, record the weight of the rod-shaped glass piece 4b and record the weight of the molten glass lump 1a.
and the desired weight.

Normally, the fusion between the drawing means 3 and the molten glass gob 1a may be carried out using the heat retained in the molten glass gob 1a, but by heating the tip of the drawing means 3 in advance, stability at one working speed can be improved. We aim to

In order to make it possible to supply a molten glass gob with highly accurate ff1ffi adjustment, it is possible to continuously produce glass products with high shape precision, such as optical elements, directly from the molten glass gob from the melting furnace. Become a messenger.

Further, by providing a plurality of drawing means and driving devices for one molten glass gob, it is possible to improve the working speed.

The weight of a bar-shaped piece of glass is now controlled by controlling the rotation of a motor, but it is not necessarily limited to controlling the rotation of a motor. For example, an air cylinder can be used instead of a drive device to control the cutting timing. It goes without saying that it may be possible to provide a cheaper device by controlling the above.

In this embodiment, the pull-out means is operated from directly above, but
It goes without saying that by bringing the pulling means into contact with the end of the molten glass gob from obliquely upward, it is possible to obtain a molten glass gob with less noticeable cut marks.

Furthermore, by using the molten glass lump obtained in the above embodiment, it is no longer necessary to use a complicated process such as that employed in the reheat press method, which reduces the processing time of the lens element and the price of the lens element. be able to.

[Effects of the invention] By fusing a pull-out means made of a substance that fuses glass to a softened molten glass lump and pulling out a rod-shaped glass piece from the glass lump, the weight can be reduced. By making this adjustment, it is possible to supply molten glass lumps that have been immersed with high precision, and it is possible to continuously produce glass products with high shape precision, such as optical elements, directly from molten glass from the melting furnace. be able to.

Furthermore, by providing a plurality of L drawer stages and drawer adjustment means for one molten glass gob, the work speed can be improved.

In addition, by using the obtained molten glass lump, it is no longer necessary to use complicated processes such as those employed in the reheat press method, and it is possible to reduce the processing time of lens elements and the price of lens elements. .

[Brief explanation of drawings]

Fig. 1 is a diagram showing the positional relationship between the drawing device and the molten glass gob placed under it, Fig. 2 is a diagram showing the state when the drawing means comes into contact with the molten glass lump, and Fig. 3 is a diagram showing the state when the drawing means is in contact with the molten glass lump. FIG. 4 is a diagram showing the state when glass is being pulled out in a rod shape from the molten glass lump, and FIG. 4 is a diagram showing the state after the weight adjustment is completed. Explanation of symbols ゛ 1 is the molten glass lump 3 is the drawing means 4b is the bar-shaped glass representative Patent attorney Minoru Yamashita Figure 2 Figure 3

Claims (2)

[Claims] (1) A drawer means made of a substance that fuses glass,
A method for finely adjusting the weight of a molten glass gob, characterized in that the weight is adjusted by fusing the molten glass gob in a softened state and pulling out a rod-shaped glass from the glass gob. (2) In order to reduce the weight of the molten glass lump weighed in advance, a plurality of the drawing means are used, and
2. A method for finely adjusting the weight of a molten glass gob according to claim 1, characterized in that a drawer adjusting means for adjusting a drawer speed and a drawer distance is used.