JPH11263628A - Apparatus for producing glass rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for producing a glass rod which improves the productivity in glass rod production. SOLUTION: This apparatus 10 for producing glass rods consists of a nozzle 18 to which glass G is supplied from a glass housing section heated to a specified temp. and roller sections 13, 13 which are arranged on the lower side of the nozzle 18 and are provided to rotate by holding the glass G in order to draw the glass G suspended from the nozzle 18. In such a case, at least one throttling part 12c formed to have a diameter smaller than the diameter of the nozzle 18 is disposed between the glass housing section 12 and the nozzle 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a glass rod manufacturing apparatus, and more particularly to a glass rod manufacturing apparatus which facilitates control of the diameter of a glass rod.

[0002]

2. Description of the Related Art In general, in manufacturing a magnetic head, as shown in FIG. 5, a method is employed in which two magnetic head half cores are joined by glass fusion or the like and sliced. ing. When the two magnetic head half cores are fused by glass, first, in a state where the two magnetic head half cores abut against each other, a glass rod is formed in a glass groove or a winding window formed in the magnetic head half core. Insert GL. Then, by heating and melting the glass rod GL to the melting point, the two magnetic head half cores are fused.

As a method of manufacturing a glass rod used at this time, a method of manufacturing by hanging glass and a method of manufacturing by pulling up glass are generally known. FIG. 6 shows an example of a conventional glass rod manufacturing apparatus for manufacturing a glass rod by hanging glass, and the glass rod manufacturing apparatus 1 will be described with reference to FIG. The glass rod manufacturing apparatus 1 shown in FIG. 6 includes a glass container 2, a roller 3, heaters 5, 6, 7, a nozzle 8, and the like.

As shown in FIG. 7, the glass container 2 comprises a crucible 2a and a passage tube 2b. Glass serving as a raw material of the glass rod GL is accommodated in the crucible 2a. A heater 5 is disposed on the outer peripheral surface of the crucible 2a, and the crucible 2a is heated by the heater 5 to
The glass G in a is heated. Crucible 2a is passage tube 2b
And the glass G contained in the crucible 2a is supplied to the passage tube 2b. Heaters 6 and 7 are arranged on the outer peripheral surface of the passage tube 2b, and the passage tube 2b is heated to a constant temperature to heat the glass G in the passage tube 2b.

A nozzle 8 is provided at the end of the passage tube 2b in FIG. 6, and the nozzle 8 has, for example, a substantially circular cross section. Rollers 3, 3 are provided below the nozzle 8, and an interval is provided between the rollers 3, 3 by the size of the diameter of the glass rod GL. The rollers 3 and 3 rotate in the directions of the arrows R1 and R2, respectively, and draw out the nozzles 8 with the glass G interposed therebetween.

Next, a method for manufacturing a glass rod will be described in detail with reference to FIG. First, put the glass G on the crucible 2a
Is stored, the glass G is heated by the heater 5 in the crucible 2a, and the stored glass G is melted. The melted glass G is sent from the crucible 2a to the passage tube 2b and hangs downward from the nozzle 8. At this time, since the passage tube 2b is heated to a constant temperature by the heaters 6 and 7, the glass G has a predetermined viscosity when passing through the passage tube 2b. Then, the glass G is sandwiched between rollers 3, 3 provided below the nozzle 8, and pulls down the glass G at an appropriate rotation speed (draws a glass wire). Thereafter, the glass rod GL is cut to a predetermined length by a cutting means such as a cutter (not shown).

When glass rods GL having different diameters are manufactured using the glass rod manufacturing apparatus 1, the heater 5,
The change is performed by changing the viscosity of the glass G by changing the temperature of 6 and 7 and by changing the rotation speed of the rollers 3 and 3. Specifically, the viscosity of the glass G decreases when the temperature is high, and increases when the temperature is low. The diameter of the glass rod GL increases as the rotation speed of the rollers 3 decreases. When the viscosity of the glass G is low, the diameter of the glass rod GL is large, and when the viscosity of the glass is high, the diameter of the glass rod GL is small. In addition, the diameter of the glass rod GL increases as the rotation speed of the rollers 3 decreases.

[0008]

However, in the conventional glass rod manufacturing apparatus 1, there is a limit in manufacturing such that the diameter of the glass rod becomes large. That is, when manufacturing a glass rod GL having a large diameter, the heaters 5, 6, and 7 must be adjusted so that the temperature of the glass G increases. However, if the temperature is too high, the viscosity of the glass G decreases. In addition, there is a problem that the flow of the glass G becomes faster and a glass rod GL having a large diameter cannot be manufactured. On the other hand, if the temperature of the glass G is lowered, the viscosity increases, and there is a problem that the rollers 3 cannot pull out the glass G. Therefore, there is a problem that it is difficult to control the temperature when manufacturing the glass rod GL having a large diameter.

Accordingly, an object of the present invention is to provide a glass rod manufacturing apparatus which solves the above-mentioned problems and improves the productivity of manufacturing a glass rod.

[0010]

According to the present invention, there is provided a glass container for containing glass which is heated to a certain temperature and melted, and provided in the glass container. As the glass rod is formed in a cylindrical shape, its cross section is formed in a substantially circular shape, and a nozzle for dripping the glass supplied from the glass container is disposed below the nozzle, and the glass droops from the nozzle. In a glass rod manufacturing apparatus, comprising: a roller portion that is provided so as to rotate across the glass in order to pull out the glass that has been drawn.
This is achieved by a glass rod manufacturing apparatus provided with at least one throttle unit formed between the glass container and the nozzle with a diameter smaller than the diameter of the nozzle.

In the present invention, at least one throttle portion is formed in the glass storage portion, and this throttle portion limits the flow rate of glass supplied from the glass storage portion to the nozzle. Thereby, when manufacturing the glass rod by hanging down the glass G, it is possible to limit the flow speed at which the glass G hangs down, to easily control the glass G, and to manufacture a glass rod having a large diameter.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 is a system diagram showing a preferred embodiment of the glass rod manufacturing apparatus of the present invention. The glass rod manufacturing apparatus 10 will be described in detail with reference to FIG. The glass rod manufacturing apparatus 10 shown in FIG.
2, a roller 13, heaters 15, 16, 17 and the like. As shown in FIG.
2a, a passage tube 12b, and a throttle portion 12c. A heater 15 is provided on the outer peripheral side of the crucible 12a, and the heater 15 heats the crucible 12a. Glass material is stored in the crucible 12a, and when the crucible 12a is heated by the heater 15, the glass G becomes a fluid having a constant viscosity.

A passage tube 12b is provided below the crucible 12a, and a heater 16 is provided on an outer peripheral side of the passage tube 12b.
17 are arranged. The heaters 16 and 17 are connected to the passage tube 12.
The glass G flowing inside b is maintained at a predetermined temperature, and the viscosity of the glass G is set to a predetermined value. Passage pipe 12b
A narrow portion 12c is formed in the middle portion, and the diameter φ1 of the narrow portion 12c is smaller than the diameter φ2 of the nozzle 18. Thus, the throttle unit 12c reduces the flow velocity of the glass G when the glass G is supplied from the crucible 12a to the nozzle 18. That is, by reducing the diameter through which the glass G passes in the passage tube 2b, the flow velocity of the glass in the passage tube 2b can be suppressed, and the temperature and the flow rate of the glass G can be easily controlled.

A nozzle 18 is provided at the end of the passage tube 12b, and the nozzle 18 is supplied with the glass G contained in the crucible 12a. The nozzle 18 has a substantially circular cross section in order to make the glass rod cylindrical. Thereby, the wire diameter accuracy and the roundness accuracy of the manufactured glass rod GL can be improved. Rollers 13 and 13 are arranged below the nozzle 18, and a gap D is provided between the rollers 13 and 13. The rollers 13 are rotating in the directions of arrows R1 and R2, respectively, and pull the glass out of the nozzle 18 while holding the suspended glass G in the gap D.

Next, a method of manufacturing a glass rod will be described in detail with reference to FIG. First, the crucible 12 in FIG.
The glass material is accommodated in a and heated by the heater 15. Then, the glass raw material is dissolved to become a fluid having a constant viscosity, and the glass G is subjected to a stirring and fining (bubble removal) process as necessary. Thereafter, the glass G passes through the inside of the passage tube 12b and is supplied to the nozzle 18. At this time, in order to restrict the amount of glass supplied to the nozzle 18, the flow rate of the glass G is prevented from being increased by the throttle portion 12b. The glass G in the passage tube 12b is maintained at a constant temperature by the heaters 16 and 17,
It has a predetermined viscosity.

The nozzle 18 forms the supplied glass G into a circular shape which is the cross-sectional shape of the nozzle 18 and hangs the glass G downward. By dripping the glass G from the nozzle 18, the roundness accuracy and the wire diameter accuracy of the glass rod GL can be processed with high accuracy. The glass G hanging down from the nozzle 18 is sandwiched in the gap D between the rollers 13. Then, the rollers 13 and 13 rotate in the directions of arrows R1 and R2, respectively, to pull out the glass G from the nozzle 18, and
Adjust the shape of the glass G. Thereafter, the glass G is cut into a predetermined length by a cutter (not shown), and the glass rod GL is completed.

FIG. 3 shows a comparison table in the case where the glass rod GL is manufactured by the glass rod manufacturing apparatus 1 shown in FIG. 5 and the glass rod manufacturing apparatus 10 shown in FIG. 1 according to the above embodiment. . In FIG. 3, for example, when it is attempted to manufacture a glass rod GL having a diameter of 0.7 mm, for example, in a state where the conditions such as the heating conditions of the heater, the material of the glass, and the number of rotations of the rollers are all matched. In the glass rod manufacturing apparatus 1, the flow rate of the glass G could not be controlled, and a glass rod having a diameter of 0.7 mm could not be manufactured. On the other hand, the glass rod manufacturing apparatus 10 was able to manufacture a glass rod GL having a large diameter of 0.7 mm.

Incidentally, the present invention is not limited to the above embodiment. Although only one narrowed portion 12c is formed in the glass housing portion of FIG. 2, as shown in FIG. 4, two narrowed portions 12c may be provided for the passage tube 12b. Thereby, the flow velocity when the glass G passes through the passage tube 12b can be further suppressed, and a glass rod having a larger diameter can be manufactured.

[0020]

As described above, according to the present invention,
The productivity of the production of the glass rod can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a preferred embodiment of a glass rod manufacturing apparatus of the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of a glass container in FIG.

FIG. 3 is a comparison table when glass rods are manufactured under the same conditions in a conventional glass rod manufacturing apparatus and a glass rod manufacturing apparatus according to a preferred embodiment of the present invention.

FIG. 4 is a schematic sectional view showing an example of another embodiment of the glass container of FIG. 1;

FIG. 5 is a schematic perspective view showing a state in which a glass rod is inserted into a magnetic core block and a magnetic core half block is glass-fused;

FIG. 6 is a system diagram showing an example of a conventional glass rod manufacturing apparatus.

FIG. 7 is an enlarged sectional view showing a glass container of the glass rod manufacturing apparatus in FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Glass rod manufacturing apparatus, 12 ... Glass accommodation part, 13 ... Roller, 15, 16, 17 ... Heater, 18 ... Nozzle, GL ... Glass rod, G
..Glass.

Claims (3)

[Claims] 1. A glass housing section for housing glass melted by being heated to a certain temperature, and a glass housing section provided in the glass housing section, the cross section of which is formed so that a glass rod is formed in a columnar shape. It is formed in a substantially circular shape, and a nozzle for dripping the glass supplied from the glass container, and disposed below the nozzle, so as to rotate around the glass to pull out the glass dripped from the nozzle. In the glass rod manufacturing apparatus comprising the provided roller portion, at least one throttle portion formed with a diameter smaller than the diameter of the nozzle is provided between the glass housing portion and the nozzle. Characteristic glass rod manufacturing equipment. 2. The glass rod manufacturing apparatus according to claim 1, wherein the diameter of the constricted portion is formed to be approximately の of the diameter of the nozzle. 3. The glass storage section includes: a crucible for storing and heating the glass; and a passage pipe provided between the crucible and the nozzle for supplying the glass stored in the crucible to the nozzle. The glass rod manufacturing apparatus according to claim 1, wherein a throttle portion is provided at an intermediate portion between the crucible and the nozzle of the passage tube.