JPS58190827A - Method and apparatus for manufacturing glass block - Google Patents

Abstract

PURPOSE:To manufacture a glass block causing no distortion of an image, by premolding molten glass to the shape of a strip in a shoot whose width is almost equal to the inside width of a mold, feeding the premolded glass to the mold, and horizontally moving the mold in synchronism with the feeding speed while suitably lowering the mold. CONSTITUTION:A gate 12 attached to the feeder 11 of a melting furnace 10 is opened to lead molten glass G to a mold 20 through a shoot 30. The shoot 30 has a rectangular cross-sectional shape, and the width is almost equal to the inside width of the mold 20, so the glass G is premolded into strip glass G' whose width is almost equal to the inside width of the mold 20. The mold 20 is horizontally moved in synchronism with the feeding speed of the glass G' through a horizontally moving table 23 mounted on a vertically moving table 40 to charge the glass G corresponding to one layer into the mold 20 from one end to the other end. When a switch 58 contacts with a stopper 57, the moving direction of the mold 20 is reversed, and the glass G' for the next layer is charged. During this time, by working the table 40, the mold 20 is lowered so as to keep the height of the shoot 30 to the glass surface constant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to glass processing, and in particular to a VJM method and apparatus for radiation protection glass for window glass for viewing a radiation source FIF room or equipment room from the outside. It is.

The glass contains a component that blocks radiation, but in order to obtain a flat shielding effect, its thickness is 40 cm.
What is needed is something that can reach this level.

For example, there is a method shown in IJ old M (No. 52-121.619 No. 1111) in the production of thick-walled glass. When pouring from one end of a mold, a glass flow is introduced into the introduction expansion part of the mold, and the cross section of the flow is sequentially and continuously expanded along the inner surface shape of the introduction expansion part to form and solidify into the desired shape. It is.

Even if the glass c′j is sufficiently stirred during melting, when molding a product with a large amount of glass tt, such as a thick glass block, the molding should be done in such a way that local non-uniformity of the glass called striae does not occur. That's like an older sister. The refractive index of light in the striae is different from that in other parts of the glass, so when you observe an object through glass with striae, the details of the object may look familiar or the object may appear distorted.

The present invention improves these points.

In the present invention, molten glass is preformed into a belt shape into a sheet having a width approximately equal to the inner width of the mold, and is then supplied to the mold. The mold is moved horizontally in synchronization with the feed rate of the glass ribbon, and one layer of glass ribbon is cast from one end of the mold to the other end. The mold is then pulled back and the glass ribbon is superimposed on top of the previously cast glass. At this time, if the height of the chute relative to the glass plate previously cast is constant, ′/, f
The mold was lowered by 19η· so that

The following is an explanation using the drawings.

The drawings all show embodiments of the present invention, and FIG. 1 is a side view with a part of q cut away, and FIG. 2 is a side view of the manufacturing apparatus; FIG.
The normal hemogram, FIG. 8, is a process diagram showing the casting procedure.

A gate 12 is provided in the feeder 11 of the melting furnace 10 to intermittent the molten glass G, and the molten glass G taken out is transferred to the chute 30.
leads to mold 2o. The chute 80 has a claw-shaped cross section and is set to the J method, which is approximately equal to the inner width of the mold 2o. Therefore, by passing the molten glass G through this chute 30, it is possible to pre-form it into a band-shaped glass G' having a width approximately equal to the width of the mold 2°.

Next, a mechanism for moving the mold 20 horizontally and vertically will be explained. In the fi41 type 20, a rack 21 is integrally formed, and a guide roller 22 is fixed to a horizontally moving U base 23 from which the guide roller 22 is removed. This horizontal moving table 23 is provided with a vertical moving table 4.0, so that the mold 20 can be moved horizontally and vertically at the same time. Horizontal transfer) stand 23
The lower surface of is supported by rollers 24 provided on the vertically movable table 4o,
The guide roller 22 contacts the fixed rail 25 to regulate the horizontal movement table 23. For horizontal movement, the rotation of a drive motor 43 attached to the vertically movable table 4o is transmitted to the girder 21 via a pinion gear 41 and a gear 42.

Next, the mechanism for vertical movement of the UJ type 2 will be explained. The vertically movable table 4o provided with the horizontally movable table 23 is provided with four feed screws 51 vertically screwed into the base 50 in two rows in the front and rear on its lower surface. These four feed screws 51 are each connected to a drive motor 53 via a bevel gear 52, so that they are moved up and down at the same pitch by the rotation of the motor 53. Further, the vertical movable table 40 includes a plurality of sets of guide rollers 5 on the outside.
4 and place 1 by the guide rail 55? Regulate ffi. A support 57 extending upward is provided with a strike 57, and when the horizontal moving table 28 moves and hits the switch 58 provided on the side of the mold 20, the polarity changes and the drive motors 4 and 3 The rotation of the horizontal moving table 2 is reversed.
Avoid moving 3 in the opposite direction.

Using the above-mentioned moving mechanism, the mold 20 is horizontally moved in synchronization with the supply speed of the I'I-shaped glass G', and one layer of strip glass G' is cast from one side of the mold 2° to the other. The movement of the mold 20 is reversed. At the same time, the vertical moving table 40 is lowered as the glass wall increases so that the contact between the sheet and the glass surface in the mold 20 is constant. This is made by laminating many layers of glass G'.

FIG. 3 is a process diagram for explaining the casting procedure for stacking multiple layers of band-shaped glass G' divided into eight steps (a) to ←).

In step (a), the gate 12 of the feeder 11 is closed and the supply of the bath molten glass G is cut off. The mold 20 is waiting at a position slightly away from the lower end of the chute 30.

When the gate 12 is opened, the M molten glass G begins to flow on the chute 30 and becomes a ribbon glass J. Shoot 30 is the 2nd M
As shown in FIG. 3, the mold 20 has a width approximately equal to the inner width of the mold 20, and is provided with a side wall 3. However, in FIG. Omitted.

As is clear from step ←), the initial portion of the glass band G' that begins to flow is flowed outside the mold 20 and is not supplied into the mold 20. When the flow of the glass band G' becomes stable, the glass band G' is cut at the lower end of the chute 30 (step (c)). At the same time, the mold 20 is moved to the lower end of the chute 30, and the mold 20 is rapidly raised.

In the process), the supply of the ribbon glass J begins, and the mold 2
0 is further moved in the same direction to cast the first layer of band-shaped glass G'. Since the mold 20 moves horizontally in synchronization with the supply speed of the glass strip J, the glass strips σ can be spread evenly as in step (E).

When the mold 20 eventually reaches the stop and stop positions 57 and the switch 58 comes into contact, the direction of movement is reversed and turned back.

On the other hand, since the glass in the mold 20 gradually increases in thickness, the vertical moving table 7IO is operated to lower the mold 20 in order to maintain a constant height of the chute 30 relative to the glass.

The horizontal, vertical, and vertical movement of the mold 20 is automatically controlled by a horizontal movement table and a vertical movement table according to a preset sequence program.

A process in which the thickness of the glass increases as the glass strips G' are stacked and cast by repeating the reciprocating movement of the casting 20 many times.
Filling ends when a predetermined thickness is reached (process (g)).

When the casting is completed, the gate 12 of the feeder 11 is closed (process cutoff)), and the vj mold 20 is stopped at the position of the first step (a). Next, the molds 20 are taken out from the horizontal moving table 28 in a direction perpendicular to the direction in which they are lined up and moved, and transferred to an annealing furnace. After annealing, the glass product is extracted from the mold 20 to obtain the desired glass finish.

As mentioned above, in the present invention, bath molten glass is preformed into strips and stacked on top of each other.The roughly folded strips have a uniform temperature distribution and melt in a stationary state. Even if heterogeneous striae exist, they are distributed in layers parallel to the flow direction of the glass, so there is no change in the refractive index when observed from the vertical direction of the glass surface.
Therefore, no image distortion occurs.

[Brief explanation of drawings]

The drawings all show embodiments of the present invention; Fig. 1 is a side view of the manufacturing device with a part cut away, Fig. 2 is a front view of A and A, and Fig. 8 is a drawing of the casting process. . G' is a band-shaped molten glass, 11 is a feeder, 12 is a gate, 2011 is a spinning die, 30 is a chute, 28 is a horizontal moving table, and 40 is a vertically moving table. Patent applicant Nippon Electric Glass Co., Ltd. Representative Fu Nagasaki - 10- 145

Claims (2)

[Claims] (1) Dissolved in vJ type) Ad! Using the glass casting method, a gate is provided in the feeder of the bath melting furnace to continue the bath melting glass, and the molten glass taken out is preformed into a band shape using one cavity of the mold and a chute approximately 9cm wide. The mold is moved horizontally in synchronization with the IJ feeding speed of the glass strip, and after casting 11η of the glass strip from one side of the mold to the other, the mold is pulled back and the strip 4. (The process of overlaying the glass on top of the glass that was first cast, the process of raising and lowering the mold so that the height of the chute relative to the surface of the cast glass is constant, and the process of placing the ribbon in the mold separately) A method for manufacturing a crow block, which comprises a step of transferring the crow block to a slow cooling furnace. (2) A device 1q for casting molten glass into a mold, which includes a fuser equipped with a gate for intermittent supply of molten glass, and a mold 111Il that preforms the molten glass into a band shape. Shoots of equal width,
A horizontal moving table is used to horizontally move the mold in which the molten glass is cast into a shape through a sheet in synchronization with the FIL feeding speed of the bath molten glass, and a strip of one layer is moved from one side of the mold to the other side. After pouring the glass, pull back the mold and place the ribbon glass on top of the previously cast glass. Raise and lower the mold so that the height of the sheet relative to the glass surface in the M mold is constant. After the moving table and the glass are cast,
1111i production equipment for glass blocks, consisting of an IPl for transferring the mold to an annealing furnace, and a removal mechanism.