JP2015107894A - Glass tube processing method and glass tube processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce generation of a crack by reducing dispersion of an elongation timing of a glass tube in processing of the glass tube.SOLUTION: A glass tube processing method has: an elongation step for elongating and sealing a glass tube 10 by softening it by heat of a gas burner 3, while pulling the glass tube 10 by an air cylinder 4 with a fixed power; a cutting step for cutting by heat of the gas burner 3, a spot narrowed by elongating the glass tube 10; and a reheating step for rounding the cut spot by the heat of the gas burner 3.

Description

  The present invention relates to a glass tube processing method and a glass tube processing apparatus for processing a glass tube.

UV tubes are used as flame detection sensors for combustion safety devices such as drying furnaces in automobile body and parts coating lines, melting furnaces used for die casting of aluminum and zinc, and heat treatment furnaces such as quenching of metal parts. Widely used in the field of industrial furnace combustion control.
When processing this UV tube, a special gas called Penning gas is introduced into the tube, and then gas filling and cutting called chip-off are performed. In this tip-off, first, a specific portion of the gas introduction tube of the UV tube is blown and softened, and then stretched. Next, the gas introduction pipe is cut by blowing a portion (tip-off portion) that has been stretched and thinned. Next, the open end of the gas introduction pipe is rounded by blowing the cut portion again.

Here, as the control method of the timing for extending the gas introduction tube of the UV tube, control by time control, temperature control, and image processing can be considered, and generally, a method in which pulling speed control is combined with temperature control is used. (See, for example, Patent Document 1). However, when the diameter of the gas introduction pipe is small, there is no appropriate temperature measurement method. Also, in the case of a multiple batch process, control by image processing is difficult.
On the other hand, in the drawing process of the glass plate, a method of controlling the pulling speed by monitoring the glass plate thickness is used (for example, see Patent Document 2). However, it is difficult to apply the glass plate thickness monitoring to the batch processing.
Therefore, at present, the worker determines the expansion timing based on experience.

JP 2003-286043 A JP 2003-171129 A

  As described above, in the processing of the UV tube, the timing for extending the gas introduction tube of the UV tube is currently determined by the experience of the operator. For this reason, there is a problem in that the variation in the stretching timing causes variations in the shape of the chip-off portion, which causes cracks. And since a UV tube is used for a combustion safety device as mentioned above, it will become a big problem, if outgassing occurs by a crack.

  The present invention was made in order to solve the above-described problems. In the processing of a glass tube, a glass tube processing method capable of reducing variations in the stretching timing of the glass tube and reducing the occurrence of cracks. It aims at providing a glass tube processing apparatus.

  In the glass tube processing method according to the present invention, the glass tube is stretched by being softened by the heat of the heat supply while being pulled with a constant force by a pulling mechanism, and the glass tube is stretched, and in the stretching step It has a cutting step that cuts the thinned portion by stretching the glass tube by the heat of the heat supply device, and a reheating step that rounds the cut portion in the cutting step by the heat of the heat supply device.

  Further, the glass tube processing apparatus according to the present invention includes a stretching unit that seals the glass tube by stretching the glass tube by softening with the heat of the heat supply unit while pulling the glass tube with a constant force by a pulling mechanism, A cutting section that cuts the thinned portion by the heat of the heat supply unit, and a reheating unit that rounds the portion cut by the cutting unit by the heat of the heat supply unit. It is a thing.

  According to this invention, since it comprised as mentioned above, in processing of a glass tube, the dispersion | variation in the expansion timing of a glass tube can be reduced, and a crack generation can be reduced.

It is a figure which shows the structure of the glass tube processing apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the glass tube which processes with the glass tube processing apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the control apparatus in Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the glass tube processing apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows operation | movement of the glass tube processing apparatus which concerns on Embodiment 1 of this invention. It is a table | surface which shows the glass temperature at the time of the chip | tip off by the glass tube processing apparatus concerning Embodiment 1 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
1 is a diagram showing a configuration of a glass tube processing apparatus according to Embodiment 1 of the present invention.
The glass tube processing apparatus processes the glass tube 10 such as a UV tube. As shown in FIG. 1, the glass tube processing apparatus includes a shielding jig 1, a gas sealing port 2, a gas burner (heat supply device) 3, an air cylinder (a tension mechanism) 4, and a control device 5. In addition, illustration of the gas burner 3 is abbreviate | omitted in FIG.
Further, as shown in FIG. 2, the glass tube 10 has a lead wire 101 and a main body portion 102 into which a gas is introduced, and an end portion opened at a stage before processing, and the gas is introduced into the main body portion 102. And a gas introduction pipe 103 which is sealed after being formed.

The shielding jig 1 can accommodate the lead wire 101 and the main body 102 of the glass tube 10, and when the gas burner 3 applies heat to a specific portion of the gas introduction tube 103, the influence of the heat on the lead wire 101 and the main body 102. It is for avoiding.
The gas sealing port 2 is connected to the open end of the gas introduction tube 103 of the glass tube 10 and introduces gas into the main body 102 via the gas introduction tube 103.

The gas burner 3 is disposed opposite to a specific location of the gas introduction tube 103 of the glass tube 10 and applies heat to the specific location.
The air cylinder 4 pulls the glass tube 10 with a constant force. In FIG. 1, the air cylinder 4 is connected to the shielding jig 1, and is configured to pull the glass tube 10 by pulling the shielding jig 1 upward with a constant force.

  The control device 5 performs tip-off in glass tube processing using the gas burner 3 and the air cylinder 4. As shown in FIG. 3, the control device 5 includes an enlargement unit 51, a cutting unit 52, and a reheating unit 53.

  The stretcher 51 softens a specific portion of the gas introduction tube 103 by the heat of the gas burner 3 while pulling the glass tube 10 with a constant force by the air cylinder 4, thereby sealing the glass tube 10 by stretching the specific portion. To do. At this time, the stretcher 51 pulls the glass tube 10 with a constant force by the air cylinder 4 from before the glass is melted, thereby changing the viscosity due to the softening of a specific portion of the gas introduction tube 103 due to the heat of the gas burner 3. Stretch according to the relationship.

The cutting part 52 cuts a portion (tip-off part 104) that is narrowed by the gas introduction pipe 103 being stretched by the stretching part 51 by the heat of the gas burner 3.
The reheating unit 53 rounds the portion cut by the cutting unit 52 by the heat of the gas burner 3.

Next, the operation of the glass tube processing apparatus configured as described above will be described with reference to FIGS. FIG. 5 is an enlarged cross-sectional view of a portion where the gas introduction pipe 103 is chipped off. As shown in FIG. 1, the glass tube 10 has the shielding jig 1 attached to the main body portion 102, and the open end portion of the gas introduction tube 103 is connected to the gas sealing port 2.
In the operation of the glass tube processing apparatus, as shown in FIG. 4, first, gas is introduced into the main body 102 through the gas introduction port 103 of the glass tube 10 through the gas sealing port 2 (step ST1).

  Next, the control device 5 of the glass tube processing apparatus performs chip-off. In this tip-off, first, the stretcher 51 pulls the specific part by softening the specific part of the gas introduction pipe 103 by the heat of the gas burner 3 while pulling the glass tube 10 with a constant force by the air cylinder 4. The stretched glass tube 10 is sealed (step ST2, stretching step). At this time, the stretcher 51 pulls the glass tube 10 with a certain force by the air cylinder 4 from before the glass is melted, and thereby the viscosity accompanying the softening of a specific portion of the gas introduction tube 103 of the glass tube 10 by the heat of the gas burner 3. Stretching is performed according to the relationship with changes. Thereby, as shown in FIGS. 5A to 5C, the tip-off portion 104 is formed in the gas introduction pipe 103.

  Next, the cutting unit 52 cuts the portion (tip-off portion 104) that is narrowed by the gas introduction pipe 103 being stretched by the stretching unit 51 by the heat of the gas burner 3 (step ST3, cutting step). As a result, the gas introduction tube 103 is cut at the tip-off portion 104 as shown in FIG.

  Next, the reheating unit 53 rounds the portion cut by the cutting unit 52 with the heat of the gas burner 3 (step ST4, reheating step). Thereby, as shown in FIG.5 (e), the chip | tip off part 104 is rounded off.

As described above, in the present invention, when the gas introduction tube 103 is stretched at the tip-off time, the stretching timing is controlled by the viscosity of the glass. That is, the tension of the gas introduction pipe 103 is controlled by the air cylinder 4 and a certain force is applied in advance before the glass is melted. On the other hand, the gas introduction pipe 103 is softened by being blown by the gas burner 3, and the viscosity changes. Here, the unit of the viscosity η of the glass is represented by [Pa · s] = [N / m ^ 2 · s]. That is, when the gas introduction pipe 103 reaches a certain viscosity, it balances with the thrust of the air cylinder 4, and then the expansion of the gas introduction pipe 103 is automatically started. Further, by using the air cylinder 4, the stretch amount of the gas introduction pipe 103 can always be kept constant. Further, there is no need to consider the stretching timing and the stretching amount, and a stable tip-off portion 104 shape can be obtained.
In addition, when the viscosity to start stretching is determined in advance, the supply pressure and the pressure receiving area of the air cylinder 4 may be selected so as to balance the viscosity.

FIG. 6 shows the glass temperature at the time of chip-off.
It can be seen that in the conventional method (a configuration in which the air cylinder 4 is not used), the variation in the maximum temperature of the glass is large and the stretching timing varies (broken lines 61 to 63 in FIG. 6). On the other hand, in the present invention (configuration using the air cylinder 4), it can be seen that the variation in the highest point of the glass temperature is small and the stretching timing is stable (solid lines 64 to 66 in FIG. 6).

  As described above, according to the first embodiment, the air cylinder 4 that pulls the glass tube 10 with a constant force is used to control the stretching timing based on the viscosity of the glass. In processing, variation in the stretching timing of the glass tube 10 can be reduced, and the occurrence of cracks can be reduced.

  Although the case where the air cylinder 4 is used as the pulling mechanism has been described above, the present invention is not limited to this, and any mechanism that can supply a constant force may be used. For example, a spring or an electric actuator may be used.

  In the above description, the control device 5 controls the gas burner 3 and the air cylinder 4. However, the present invention is not limited to this, and the gas burner 3 and the air cylinder 4 may be handled by human hands.

  Further, in the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

1 Shielding jig 2 Gas filling port 3 Gas burner (heat supply)
4 Air cylinder (Tensioning mechanism)
5 Control Device 10 Glass Tube 51 Enlargement Unit 52 Cutting Unit 53 Reheating Unit 101 Lead Wire 102 Main Body 103 Gas Introducing Tube 104 Chip-off Unit

Claims (4)

A glass tube processing method by a glass tube processing apparatus comprising a heat supply device for applying heat to a glass tube having an open end, and a pulling mechanism for pulling the glass tube,
A stretching step for sealing the glass tube by stretching the glass tube by softening with heat of the heat supply unit while pulling the glass tube with a constant force by the pulling mechanism;
A cutting step of cutting the thinned portion by stretching the glass tube in the stretching step by the heat of the heat supplier;
And a reheating step of rounding the portion cut in the cutting step by the heat of the heat supply unit. The glass tube processing method according to claim 1, wherein, in the pulling step, an amount of stretching of the glass tube by the pulling mechanism is constant. The glass tube processing method according to claim 1, wherein the pulling mechanism is an air cylinder. A glass tube processing apparatus comprising a heat supply device for applying heat to a glass tube having an open end, and a pulling mechanism for pulling the glass tube,
An extension part for enlarging the glass tube by stretching it by softening it with the heat of the heat supply unit while pulling the glass tube with a constant force by the tension mechanism;
A cutting part that cuts the thinned portion by the heat of the heat supply unit due to the glass tube being stretched by the stretching part;
A glass tube heating apparatus, comprising: a reheating unit that rounds a portion cut by the cutting unit by heat of the heat supply unit.

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