JPH0873234A - Forming device and forming method for square glass cell - Google Patents

Abstract

PURPOSE: To shorten forming cycle time, to prevent burning and to improve finishing accuracy of forming. CONSTITUTION: Two heating furnaces 3 and 103 are fixed on a table 4 which is supported by a revolving shaft 5 and is turnable back and forth 180 deg.. Square blind tubes 1 are inserted by transporting claws 10a, 10b into the heating furnace 3, where these tubes are heated and thereafter, mandrel 2 are inserted therein. The table 4 is then turned 180 deg. and is transported to a forming position, where a suction cylinder 8 descends to form the square blind tubes 1 by suction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for forming a rectangular glass cell in which a cored bar is inserted into a bottomed tube and heat-formed into a predetermined shape.

[0002]

2. Description of the Related Art Conventionally, as a method for forming a rectangular glass cell, for example, there is an invention described in JP-A-60-108330. The above-mentioned invention is a method in which a cored bar is inserted into a bottomed tube, and the cored tube is gradually lowered and inserted into an electric furnace in which a heater is disposed on the inner bottom surface while exerting a suction action with a vacuum pump. The effect is to gradually heat-mold the bottomed tube in line with the core metal from the bottom side.

[0003]

However, the invention described in JP-A-60-108330 has the following drawbacks. That is, the bottomed tube is gradually lowered from the room temperature and inserted into the electric furnace to suck the vacuum pump (atmospheric pressure).
Since it is heated until it can be deformed so as to be in close contact with the core metal, it takes time for molding, especially for heating. Further, since the cored bar and the bottomed tube are heated to substantially the same high temperature by heating as described above, seizure easily occurs. Furthermore, since the atmospheric pressure only acts on the outer surface of the bottomed tube, the uniformity of the wall thickness of the molded rectangular glass cell, the parallelism of the inner and outer surfaces, the flatness of the outer surface, etc. are There is almost no improvement from the condition of the bottomed tube (material) and the accuracy is poor.

An object of the inventions according to claims 1, 2 and 3 is to shorten the molding cycle time. An object of the invention according to claim 2 is to prevent seizure and improve the accuracy of finished molding.

[0005]

SUMMARY OF THE INVENTION The present invention is a rectangular glass cell molding apparatus in which a cored bar is inserted into a bottomed tube, heated, softened and molded into a predetermined shape. An apparatus for forming a rectangular glass cell, comprising: a heating means; and a conveying means for a bottomed tube that conveys between each of the plurality of heating means and the forming means. Also,
The molding means, a core metal arranged inside the bottomed tube,
A forming device for a rectangular glass cell, comprising a molding die disposed outside the bottomed tube and a pressing means for pressing the bottomed tube between a cored bar and a molding die. . Further, in a method of forming a rectangular glass cell in which a cored bar is inserted into a bottomed tube, heated, and softened to be molded into a predetermined shape, the bottomed tube is heated in each of a plurality of heating furnaces, and the bottomed tube is heated. This is a method of forming a rectangular glass cell, which comprises successively forming each time the temperature of the tube reaches a moldable temperature.

[0006]

The operation of the invention according to claims 1, 2 and 3 is as follows.
As shown in the time chart of FIG. 1, the bottomed tube is heated in each of a plurality of heating furnaces, and the bottomed tube is sequentially molded each time the temperature reaches a moldable temperature. The operation of the invention according to claim 2 is to heat the bottomed tube to reach the moldable temperature, insert the core metal, and press the inner and outer surfaces with the core metal and the molding die to perform molding.

[0007]

Embodiment 1 FIG. 2 is a vertical sectional view of an apparatus used in this embodiment. Reference numeral 1 is a glass rectangular bottomed tube. Reference numeral 2 denotes a core metal, which is generally in the shape of a prism and whose cross-sectional dimension is slightly smaller than the inner diameter of the square bottomed tube 1 and has a small diameter rod-shaped handle at the top.
3 is a heating furnace, which is generally cylindrical and has an opening 3 at the top.
a, has a heating element 3b inside, and is fixed on the table 4. The table 4 is supported by a rotary shaft 5 and is reciprocally rotated 180 degrees as shown by an arrow A by a known means (not shown). Reference numeral 103 is a second heating furnace having the same structure as the heating furnace 3, and is fixed on the table 4 at a position symmetrical to the heating shaft 3 with respect to the rotary shaft 5. Reference numerals 6a and 6b denote a pair of holding claws that open and close, and are supported by a supporting member 7 near the upper portion of the opening 3a of the heating furnace 3. 106a, 106
Similarly, b is a holding claw and is supported by the supporting member 107 near the upper portion of the opening 103a of the heating furnace 103.

A suction cylinder 8 has a seal member 9 fitted in the vicinity of its lower end, and its upper end is connected to a vacuum generation source (not shown). The suction cylinder 8 is held by a known means (not shown) so as to be movable up and down as shown by an arrow B on the opening 103a of the heating furnace 103 at the rotating position of the table 4 in FIG. 10a and 10b are a pair of conveying claws that open and close, and 11a and 11b are similar conveying claws, both of which are supported by the conveying member 12 and are horizontally moved and vertically moved as shown by an arrow C by a known means (not shown). Reciprocating motion with two degrees of freedom. A chuck 13 is held by a known means (not shown) so as to be movable up and down as shown by an arrow D.

In the forming method using the apparatus having the above-described structure, first, the upper portion of the glass rectangular bottomed tube 1 supplied to the supply position shown at the left end of FIG.
10b is grasped and raised, conveyed to the first heating position in FIG. 2 and lowered, inserted into the heating furnace 3 and heated by the action of the heating element 3b. Here, the holding claws 6a and 6b grab and hold the portion of the rectangular bottomed tube 1 immediately below the position where the conveying claws 10a and 10b are grasping, and then the conveying claws 10a and 10b.
b opens and rises. When about half of the total heating time to reach the moldable temperature has elapsed, the chuck 13 grabs the upper part of the cored bar 2 supplied to the position shown in FIG. 2 and descends to move the cored bar 2 into a square bottomed tube. Insert inside 1. Immediately after the chuck 13 opens and rises, the table 4 moves 180
The rectangular bottomed tube 1 is conveyed together with the heating furnace 3 to the forming position shown in FIG.

When about 3/4 of the total heating time from the start of heating to the moldable temperature has elapsed, the suction cylinder 8 descends, and the seal member 9 is pressed against the upper end of the rectangular bottomed tube 1 to cause the vacuum. Due to the action of the generation source, the suction of the air inside the rectangular bottomed tube 1 is started. As the time further passes, the lower side wall of the rectangular bottomed tube 1 is softened and deformed by the action of the heating and the suction, and the core metal 2 is brought into close contact with the core metal 2 to complete the molding (the above is the above. Total heating time).

Here, the transfer claws 11a and 11b are immediately transferred.
Is lowered, the upper portion of the rectangular glass cell on which the molding is completed is grasped and then raised, and the square glass cell is conveyed to the discharge position at the right end of FIG. On the other hand, during this transportation, the table 4 is rotated 180 degrees in the reverse direction and the transportation claws 10a,
In b, the next rectangular bottomed tube 1 is conveyed to the first heating position to start a series of steps. In this way, the rectangular glass cells are molded one after another.

According to this embodiment, the present invention can be applied to the so-called vacuum forming method as described above to shorten the forming cycle time.

[0013]

[Embodiment 2] FIGS. 3 and 4 show an apparatus used in this embodiment. FIG. 3 is a transverse sectional view and FIG. 4 is a longitudinal sectional view of a central portion. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. A plurality of heating furnaces 3 are arranged rotationally symmetrically with respect to the center of the apparatus. Paired transport claws 10a, 1
0b is supported by an arm 14 and is arranged by a known means (not shown) so as to move from directly above the opening 3a of the heating furnace 3 to the center of the apparatus to advance and retreat as shown by arrow E1 and to move up and down freely. A plurality of heating furnaces 3 are provided corresponding to each.

Reference numeral 15 is a side surface type, the front end of which is a flat surface corresponding to the outer side surface of the rectangular glass cell, and the rear end of which is a table 16.
Fixed to. The table 16 is guided by a rail (not shown) fixed to the base 30 and moves back and forth toward the center of the device as indicated by an arrow F1. Reference numeral 17 denotes a fluid cylinder, the main body of which is fixed to a base 30 via a block 18, and the tip of the rod is connected to the table 16 to drive it. The above configuration from the side surface mold 15 to the block 18 corresponds to the four side surfaces of the rectangular glass cell and is substantially the same in all directions (only the tip of the side surface mold is different so as to correspond to each outer side surface of the rectangular glass cell). Four sets are arranged orthogonally toward the center of the device.

Reference numeral 19 is a bottom type, the upper end of which is a plane corresponding to the outer bottom surface of the rectangular glass cell, and the lower end is the table 20.
Fixed to. In the table 20, the tip of the bottom die 19 passes through the opening 30a of the base 30 at the center of the apparatus through the rail 21 fixed to the vertical wall 24 fixed to the base 30 as shown by an arrow G. Guide you to move up and down. Reference numeral 22 is a fluid cylinder, the main body of which is fixed to the wall 24 via a block 23, and the rod tip is connected to the table 20 to drive it.

Reference numeral 102 denotes a core bar, which is fixed to the table 25 at the upper end unlike the first embodiment. Table 25
Guides the tip of the cored bar 102 so as to move up and down at the center of the device through a rail 26 fixed to a vertical cover 29 provided upright on the base 30. 27
Is a fluid cylinder, the main body of which through the block 28
It is fixed to 9 and the tip of the rod is connected to the table 25 and drives it.

In the molding method using the apparatus having the above structure, the supply and discharge are performed just above the opening 3a of each heating furnace 3 in which a plurality of rectangular bottomed tubes 1 are arranged. From this position, the first transfer claws 10a and 10b grab the upper portion of the rectangular bottomed tube 1 and descend, and are inserted into the heating furnace 3 to start heating. At fixed time intervals, the transport claws 10a and 10b in the other directions also sequentially operate in the same manner, and the heating of the rectangular bottomed tube 1 is sequentially started in the second and third directions.

When the first rectangular bottomed tube 1 reaches the moldable temperature, the first transfer claws 10a, 10b rise, and the rectangular bottomed tube 1 is conveyed to the center of the apparatus and lowered. here,
As soon as the cored bar 102 descends by the action of the fluid cylinder 27 and is inserted into the rectangular bottomed tube 1, the fluid cylinder 22
The bottom die 19 is moved up by the action of, and the side die 15 is simultaneously advanced from four directions by the action of the fluid cylinder 17.
The bottom portion of the rectangular bottomed tube 1 and each side wall are pressed between the core 9 and the respective tip ends of the side molds 9 and the core metal 102 to perform molding in a short time.

After that, the bottom die 19 is lowered by the action of the fluid cylinder 22, and the side die 1 is actuated by the action of the fluid cylinder 17.
After the 5 moves backward in all directions, the core cylinder 102 is moved up by the action of the fluid cylinder 27, the transfer claws 10a and 10b are moved up, and the rectangular glass cell in which the molding is completed is directly above the opening 3a of the heating furnace 3. Transport and discharge. After this, the second transport claw 10
The second rectangular bottomed tube in which a and 10b have reached the moldable temperature (every time the molding is completed, the fixed time interval is determined so that the next rectangular bottomed tube reaches the moldable temperature) It is conveyed to the center of the apparatus, and thereafter, rectangular glass cells are formed in the same manner.

According to this embodiment, since the core metal does not reach a high temperature, seizure can be prevented. In addition, since the inner and outer surfaces of the rectangular bottomed tube are also pressed and molded, the accuracy of the finished molding is improved. Furthermore, since the molding can be performed with an arbitrary pressing force, the molding time can be particularly shortened as compared with the first embodiment. Further, since the number of heating furnaces 3 can be arranged according to the ratio of the time required for heating and molding, the molding cycle time can be minimized.

[0021]

[Embodiment 3] FIG. 5 is a cross-sectional view of an apparatus used in this embodiment. The same parts as those in the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted. 3, 103 is a heating furnace,
Two of them are fixed adjacent to each other on the table 33 via the supporting members 31 and 131, respectively. Pair of holding tabs 6
a, 6b and 106a, 106b are provided on the table 33 via the support members 32, 132, respectively, on the heating furnace 3,
It is supported right above the openings 3 a and 103 a of the 103. The table 33 is guided by a rail 34 fixed to a base via a vertical cover 35, and driven by a fluid cylinder 36 fixed to the cover 35 at a rear end of a main body (not shown).
It is configured to reciprocate horizontally as indicated by arrow J.

The structures of the side surface mold 15, the bottom surface mold 19 and the cored bar 102 of this embodiment are the same as those of the second embodiment, and the description thereof will be omitted. 37a and 37b are also a pair of holding claws, and a column 38 is provided right above each side mold 15 at the center of the device.
Is fixed to the base via. A pair of transport tabs 10a,
10b is supported by an arm 14 and is moved by a known means (not shown) from a supply position shown at the left end of the drawing to a discharge position shown at the right end of the drawing through the position just above the opening of one heating furnace and the center of the apparatus. The route is arranged so as to move horizontally as indicated by arrows K1, K2, and K3 and to move up and down freely.

In the molding method using the apparatus having the above-mentioned structure, first of all, the first feeding unit is fed to the feeding position shown at the left end of FIG.
The rectangular bottomed tube 1 is conveyed by the action of the conveying claws 10a and 10b to a position right above the opening 3a of the one heating furnace 3 as shown by an arrow K1 and descends, and is inserted and held in the heating furnace 3. It is gripped by the claws 6a and 6b and heating is started. Transport claw 1
After 0a and 10b have risen, the table 33 is driven by the action of the fluid cylinder 36 to move the other heating furnace 103 to the position for supplying to the above heating furnace, and at the same time as the above with a certain time interval. Then, the heating of the second rectangular bottomed tube 1 is started, and the table 33 is driven again by the action of the fluid cylinder 36 to return to the initial position.

When the first rectangular bottomed tube 1 reaches the moldable temperature, the first rectangular bottomed tube 1 moves from the holding claws 6a and 6b to the transport claw 10a, as in the first embodiment. 10b
Is conveyed to the center of the apparatus as indicated by an arrow K2, descends and is transferred to the holding claws 37a and 37b. The transfer claws 10a and 10b are lifted up and retracted to the supply position at the left end in FIG. 5 or the supply position to the heating furnace, and then press molding is performed as in the second embodiment.

The molded rectangular glass cell is again delivered to the transport claws 10a and 10b and discharged to the discharge position at the right end in FIG. 5 as indicated by arrow K3. When the second rectangular bottomed tube reaches the moldable temperature, it is similarly conveyed and molded, and thereafter, the rectangular glass cells are heated and molded one after another in the same manner.

According to this embodiment, the same effects as those of the above-mentioned Embodiment 2 can be obtained in terms of preventing seizure of the core metal, improving the precision of molding and shortening the molding time. Furthermore, since the position of supply and discharge and the path between them are simple, it is suitable for a continuous and efficient manufacturing method by automation including supply and discharge other than that shown in this embodiment.

[0027]

The effects of the inventions according to claims 1, 2 and 3 are that the molding cycle time can be shortened. The effect of the invention according to claim 2 is to prevent seizure and
The accuracy of molding can be improved.

[Brief description of drawings]

FIG. 1 is a time chart showing the present invention.

FIG. 2 is a vertical sectional view showing the first embodiment.

FIG. 3 is a cross-sectional view showing a second embodiment.

FIG. 4 is a vertical sectional view showing a second embodiment.

FIG. 5 is a transverse sectional view showing a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Square bottomed tube 2 Core metal 3,103 Heating furnace 4 Table 5 Rotating shaft 6a, 6b, 106a, 106b Holding claw 7 Support member 8 Suction cylinder 9 Seal member 10a, 10b, 11a, 11b Conveying claw 12 Conveying member 13 chuck

Claims (3)

[Claims] 1. A rectangular glass cell molding apparatus in which a cored bar is inserted into a bottomed tube, heated, and softened to be molded into a predetermined shape, a molding means, a plurality of heating means, and a plurality of heating means. An apparatus for shaping a rectangular glass cell, comprising: a bottomed tube carrying means for carrying between each of the means and the forming means. 2. The molding means comprises a cored bar arranged inside the bottomed tube, and a molding die arranged outside the bottomed tube.
The rectangular glass cell molding apparatus according to claim 1, wherein the bottomed tube is composed of a pressing unit that presses between the core metal and the molding die. 3. A method of forming a rectangular glass cell in which a cored bar is inserted into a bottomed tube, heated, softened and molded into a predetermined shape, wherein the bottomed tube is heated in each of a plurality of heating furnaces. A method for forming a rectangular glass cell, characterized in that the bottomed tube is successively formed each time the temperature reaches a formable temperature.