JPH02271927A - System for forming cathode-ray tube panel - Google Patents

Abstract

PURPOSE:To increase the corresponding degree to the batch production of main kinds of products and to stabilize the operation of a kiln by providing a gob feeder, a press-forming device and a discharge device and furnishing plural lines for moving a metallic mold between the devices by a conveyor means. CONSTITUTION:A gob is supplied to a metallic mold by the gob feeder 9 and formed by a press-forming device 10. The formed body is released by a releasing device 5, and delivered by a formed body discharge device 6 from a serial forming system. Furthermore, the lines for conveying the metallic mold moving successively between the devices is formed with the A line and the B line starting from the gob feeder 9. Consequently, the correspondence to the batch production of many kinds of products is facilitated, and the operation of a kiln is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding system for a cathode ray tube panel.

[Prior Art] Conventionally, pins for cathode ray tube panels have been welded in a process separate from the molding process after a molten glass block called pu is placed in a mold, pressed, cooled, and removed from the mold. However, since the pin welding is performed after the panel temperature has decreased after the mold has been removed, welding takes time, and this also limits the improvement of quality.

Conventionally, as a molding device, a plurality of bottom molds are arranged in the circumferential direction on a disc-shaped index table 13 as shown in FIG. The positions of the gob supply device 11, press molding device 10, cooling device 1, shell mold removal device 2, cooling device 3, molded body removal device 6, and shell mold mounting device 8 are roughly indexed in order (predetermined rotation However, in such a molding device where the molds are indexed at the same time, if pin welding is attempted before the molded product is released from the mold, the temperature of the glass may be high. Although this method is convenient, it is known that the welding time takes 10 seconds or more, which increases the indexing stop time and significantly reduces productivity. For this reason, as shown in FIG. 4, the pressing process and pin welding process must be separated, which increases the size of the equipment and increases costs.

In addition, the above-mentioned molding apparatus also has the following problems when trying to improve the quality of the molded product, such as the dimensional accuracy of the molded product. The size and quality of the panel molded product are controlled by cooling the molded product by heat, air cooling, or water cooling so that the temperature distribution is uniform until it cools and solidifies in the mold after press molding. Because the mold is arranged concentrically, the temperature on the axis side of the index table of the mold can be accurately controlled (in order to control the temperature, sufficient space is required for temperature measurement, heating, and cooling.For this reason, The diameter of the index table must be increased, making the equipment larger and inefficient in terms of maintenance and power.Moreover, in the molding equipment, the mold is fixed to the index table, so the index table It also has the disadvantage that it is difficult to adjust the positional accuracy of the plunger of the press molding device and the mold due to the influence of thermal expansion, and increasing the diameter of the table is also undesirable from this point of view.As for adjusting the gob supply position, This is done by moving the entire index table, so
The equipment for adjustment will be large-scale.

Furthermore, since the molding apparatus has only one press position, the index time is regulated by the press time. Therefore, when changing the production type, there is a problem that the amount of glass supplied per unit time for molding the molded body fluctuates, making the operation of the kiln unstable.

[Problems to be Solved by the Invention] As described above, the conventional cathode ray tube panel molding apparatuses have the above-mentioned drawbacks that need to be solved.

An object of the present invention is to provide a compact cathode ray tube panel molding system that improves the efficiency of pin welding and the quality of welded parts, as well as improves the size and quality of molded objects and the stability of kiln operation. There is a particular thing.

[Means for solving problems]

A gob supply device that supplies gobs to a mold for molding, a press molding device that presses gobs and molds them into a predetermined shape, and a pin welding device that welds pins to the molded body before taking the molded body out of the mold. , a molding system for a cathode ray tube panel, comprising: a molded body take-out device; and a mold conveyance means for moving the mold between the respective devices in the above-mentioned manner; a gob supply device; and a press. A path through which the mold is sequentially moved and circulated between the molding device, the pin welding device, and the molded body take-out device by a conveyance means is one path, and a plurality of paths are provided for one gob supply device. The present invention provides a molding system for cathode ray tube panels.

[Example] In the molding system for a cathode ray tube panel provided by the present invention, FIG. 1 shows a block diagram of the conveyance path for the molded body and the mold in the molding system. The apparatus is mounted on a pallet, and the pallet is individually and linearly transferred between each of the apparatuses 1 to 1O in FIG. 1 along a loop indicated by a solid line. Here, 1 is a molded body and mold cooling device, 2 is a shell mold removal device,
3 is a cooling device for the molded body and the mold; 4 and 4° are devices for pin welding to the molded body; 5 is a mold release device for the molded body from the bottom mold; 6 is a molded body take-out device from the bottom mold; 7 is a standby position for the bottom mold, 8 is a device for attaching the shell mold to the bottom mold, 9 is a gob supply device to the mold, and IO is a gob press molding device.

The molded body is supplied to the bottom mold as a molten glass boundary gob by the gob supply device 9, and then press-molded with lO.
The shell mold is cooled at step 1, and the shell mold is removed at step 2. After that, it is further cooled at 3, pin welded at 4 or 4°, released from the bottom mold at 5, and sent out from the molding system for one round at 6 and transported to the lehr 12 for strain removal. Ru. After the shell mold is attached to the bottom mold at 8, it moves in the order of 9 and 10.1, and is detached from the bottom mold at 2 and immediately moves to 8, where it is attached to another bottom mold. .

Normally, the pin welding process takes more time than other processes, so the conveyance path is branched at 3 and two pin welding devices 4 and 4 are connected.
After pin welding is performed alternately at intervals of 30°, the pallet of the transport means is transferred to 5. However, when molding large products, the cycle time of the molding system is limited by the press time rather than the pin welding time. In some cases, only one pin welding device is required (there is no need to branch the conveyance path, and depending on the molded product, the time required for other processes may be sufficiently short compared to the pin welding time; The number of pin welding devices may be three or more, and the conveyance path before and after the pin welding device may be branched into three or more plurality.

FIG. 2 shows a block diagram of another preferred molded body and mold conveyance path of the present invention. This device branches the pallet conveyance path of the conveying means into two lines, A line and B line, for one gob supply device 9, and connects the press device 10 at two locations.
This is a CRT panel molding system designed to shorten the cycle time of the molding system, reduce the number of product changeovers, improve efficiency, and easily respond to high-mix, low-volume production.

Molds and molded bodies are transported individually for each pallet, and the transport routes for both A line and B line are generally the same as the molding system shown in Fig. 1, but in this system, the bottom mold standby position 7 is The transport lines A and B merge, and pallets for transport flow between the bottom mold standby position 7, the shell mold mounting device 8, and the gob supply device 9.

In the present invention, the pallet serving as the conveying means is placed and fixed on a platform such as a trolley that moves on rails or guides, and is moved, and other similar means may be used as appropriate.

[Effects of the Invention] The drive and stop of the pallets used in this system for conveying molds is independently controlled for each device. For this reason, the conveyance path is branched in processes that take a long time, such as pin welding and pressing. Alternatively, by making the stop time longer, the transport time and stop time can be set as necessary, increasing the degree of freedom in operation. For example, in pin welding equipment, if the conveyance route and conveyance means are devised so that the pallet can be stopped for the time necessary for pin welding, the molded product before mold release can be improved without reducing the cycle time of the molding system. pin welding is possible. In this case, since pin welding occurs when the molded body temperature is relatively high, the time required for welding is shortened, and the quality and yield of welding are improved. Furthermore, since the temperature at which the molded body is charged into the annealing furnace is higher than in the past, the incidence of cracking in the annealing furnace is reduced and the overall yield is improved. As shown in this system, if the pin welding process is incorporated into the molding process, the equipment will be simple and compact, and production costs will also be reduced.

Since each pallet is independent, it is possible to provide sufficient space around the mold for temperature measurement and heating and cooling, making it easier and more accurate to check the temperature of the mold and molded object than with conventional systems. Uniform control is possible.The positioning of the mold in the gob supply device only requires the alignment of the pallet, and there is no need to move the entire molding device as in the past.

Furthermore, the transporting means can easily change the direction of movement of the pallet. Since the mold can be replaced with the pallet, it also has the advantage of automating and shortening product changeovers.

In the case of a multi-route system, if the bottom molds used are not mixed and each line is installed so that it can be operated independently, it is possible to simultaneously produce multiple types with a single gob feeder, and if one line Since it is possible to switch products on the other line while the other line is operating, it is possible to handle high-mix, low-volume production and increase the degree of freedom in production planning, which reduces the need for product changes. Even when producing molded bodies, in addition to transporting each pallet individually, by using multiple press molding devices, the cycle time of the molding system is not limited by the press time, and can reach the upper limit of the supply capacity of the gob supply device 9. Productivity is improved because the time is shortened.If the cycle time is limited by the capacity of the gob feeding device 9, the amount of gob feed per unit time will be approximately constant over a long period of time, and the use of multiple press devices will increase the productivity. There are also advantages in terms of stabilizing the operation of the kiln, as there is no need to completely stop the gob supply during changeovers and periodic inspections of the molding system.

[Brief explanation of drawings]

1 and 2 are block diagrams showing two embodiments of the system of the present invention, and FIGS. 3 and 4 are block diagrams of a conventional example. 4.4°...Pin welding device 6...Molded body removal device 9...Gob supply device IO...Press molding device Figure 3 Procedure amendment 1990

Claims (3)

[Claims] (1) A gob supply device that supplies gobs to a mold for molding,
a press molding device that presses the gob and molds it into a predetermined shape;
A pin welding device for welding pins to the molded body before taking the molded body out of the mold, a molded body take-out device, and a conveying means for the mold for moving the mold between the respective devices in the above-mentioned order. A molding system for cathode ray tube panels. (2) The path in which the mold is sequentially moved and circulated between the gob supply device, the press molding device, the pin welding device, and the molded body take-out device by means of a conveyance means is defined as one path, and the path is defined as one gob supply device. A molding system for a cathode ray tube panel, which is characterized by having multiple sections. (3) A gob supply device, a press molding device, a plurality of pin welding devices, a molded body take-out device, and a conveyance means for the mold that moves between the devices and branches before and after the plurality of pin welding devices. The molding system for a cathode ray tube panel according to claim 1 or 2, comprising: