JP2002241142A - Method for cutting glass tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cutting a glass tube which enhances the surface accuracy of a cut part and makes the cut length highly accurate in glass tube cutting. SOLUTION: This method for cutting the glass tube is characterized in that a local heated part 3 is formed on the circumference of the glass tube by means of a rotary gas burner 1 which has a flame hole 1a inside and is rotated along the circumferential surface of the glass tube 2 which is inserted and held by a glass tube feeder, and subsequently, a linear cut along the local heated part 3 on the circumference of the glass tube 2 is left, only the heated part is rapidly cooled by a quenching means 8, and a linear heat distortion part 7 along the cut is formed on the local heated part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a hollow glass tube, and more particularly to a method for cutting a glass tube capable of realizing a highly accurate cut surface and cut length.

[0002]

2. Description of the Related Art A conventional glass tube cutting method will be described below.

FIGS. 3 and 4 are schematic views of a conventional glass tube cutting method. In the drawings, reference numeral 1 denotes a rotary shaft which rotates on the circumference of a glass tube 2 and has a plurality of flame holes 1a inside. Burner, 2 is a glass tube, 3 is a local circumferential heating section generated on the circumference of the glass tube 2 by the rotary burner 1, 4 is a glass tube feeder which clamps the glass tube 2 and moves in the direction of the arrow, 7 Is a heat distortion part, and 9 is a cooling block.

In FIG. 1, when the rotary burner 1 rotates on the circumference of the glass tube 2, a local circumferential heating section 3 is formed on the circumference of the glass tube 2 by the flame from the flame hole 1a. Next, the glass tube 2 is sent forward by the glass tube feeder 4, and the circumferential heating unit 3 of the glass tube 2 is rapidly cooled by the cooling block 9 to form the heat distortion unit 7.
The glass tube 2 is cut along the heat distortion part of the circumferential heating part 3.

[0005]

However, in the conventional glass tube cutting method, since the cooling block 9 cools a wide area including the non-heated portion, the surface accuracy of the cut portion is deteriorated and the cut length is further reduced. Accuracy also deteriorates.

FIG. 5 is a schematic view showing a cut state cut by a conventional glass tube cutting method. The rapid cooling by the cooling block 9 cools not only the local circumferential heating part 3 but also a wide area including the non-heating part. Reduce the cooling effect,
Further, since the width of the circumferential heating portion 3 is affected by the size, the cut by the heat distortion portion 7 may be performed in an oblique and wavy shape as shown in the figure. As a result, there is a problem that the surface accuracy of the cut portion deteriorates, and further, the accuracy of the cut length deteriorates.

The present invention improves the surface accuracy of a cut portion,
It is an object of the present invention to realize a glass tube cutting method in which the cutting length is also high precision.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a rotary burner is used to locally heat the circumference of a glass tube along a peripheral surface of the fixed glass tube,
A method for providing a glass tube cutting method, characterized in that the heating portion on the circumference is locally damaged with a rotary cutter, and further, the circumference heating portion is rapidly cooled by air blow. According to the method of the present invention, a highly accurate cut surface and cut length can be realized.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to the first aspect of the present invention is directed to a method in which a glass tube is rotated by a rotary burner which rotates along the peripheral surface of a glass tube sandwiched by a glass tube feeder and has a flame hole inside. Form a local heating section on the circumference of the pipe, then make a straight cut along the local heating section with a cutter, and quench only the heating section with quenching means,
The local heating section formed on the circumference of the glass tube is characterized by forming a linear heat distortion section along the cut in the local heating section on the circumference. A linear cut is made along the cut, it is quenched and a linear heat-strained part is formed along the cut, and cut along this linear heat-strained part. It has the effect of realizing a high-precision cut surface and cut length without being affected.

[0010] The invention according to claim 2 is characterized in that the quenching means is an air blow, and the quenching can be performed only in the heating section, so that the cooling effect can be improved. Has a function that can be.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a front view showing a circumferential heating unit of a glass tube according to an embodiment of the present invention, and FIG. 2 is a front view showing a cutter for cutting the glass tube and a cooling unit.

In the figure, reference numeral 1 denotes a rotary burner which rotates on the circumference of a glass tube 2 and has a plurality of flame holes 1a inside, 2 denotes a glass tube, and 3 denotes a rotary burner on the circumference of the glass tube 2. Local circumferential heating section occurring in
Is a glass tube feeding device that clamps the glass tube 2 and moves in the direction of the arrow, 5 is a rotary cutter that is provided at the cutting portion of the glass tube and rotates on the circumference of the glass tube, and 6 is a rotary cutter that operates when the rotary cutter 5 is operated. A press roller for pressing and holding the glass tube 2 between the rotary cutter 5 and the rotary cutter 5 and the press roller 6 so that the rotary cutter 5 and the press roller 6 can be moved toward and away from the glass tube 2 when the rotary cutter 5 is operated or not. Can be moved to Reference numeral 7 denotes a heat distortion portion generated on the circumference of the glass tube 2 by flame treatment in the rotary burner 1, and 8 denotes an air blow for cooling the circumferential heating portion 3 of the glass tube 2. In FIG. 1, a cylindrical rotary burner 1 rotating on the circumference of the glass tube 2 and having a plurality of flame holes 1a inside is provided on the circumference of the glass tube 2 fixed to the glass tube feeding device 4. Are provided, and when the rotary burner 1 rotates, the flame holes 1a are provided.
A local circumferential heating section 3 is generated on the circumference of the glass tube 2 by the flame from the heater.

Next, the glass tube feeder 4 is moved in the direction indicated by the arrow in FIG. 1, and the glass tube 2 is sent to the glass tube cutting section shown in FIG. Stop at a position that matches the blade.

Next, the rotary cutter 5 is connected to the glass tube 2.
The press roller 6 rises in synchronization with the lowering of the rotary cutter 5, and holds the glass tube 2 between the rotary cutter 5 and the press roller 6. A circumferential cut is made on the heating unit 3. When a circumferential cut is made in the circumferential heating portion 3 of the glass tube 2 by the rotary cutter 5, the rotary cutter 5 and the holding roller 6 holding the glass tube are respectively raised and lowered in a direction away from the glass tube 2. I do. Next, only the circumferential heating part 3 is rapidly cooled by an air blow 8 to form a linear heat-strained part 7 along the cut and cut along the heat-strained part 7.

As described above, in the present invention, since the glass tube is cut along the linear heat-strained portion, a highly accurate cut surface and cut length can be realized.

[0016]

According to the present invention, a linear cut is made on a local heating portion formed on the circumference of a glass tube by a cutter, and the cut is quenched to obtain a linear thermal strain along the cut. Since the portion is formed and the glass tube is cut along the heat distortion portion, there is an effect that a highly accurate cut surface and a cut length can be realized without being influenced by the width of the circumferential heating portion.

[Brief description of the drawings]

FIG. 1 is a front view showing a circumferential heating section of a glass tube of the present invention.

FIG. 2 is a front view showing a cutter and a cooling unit according to the embodiment of the present invention.

FIG. 3 is a front view showing a circumferential heating unit of a conventional glass tube.

FIG. 4 is a cross-sectional view illustrating a conventional cooling unit.

FIG. 5 is a schematic diagram showing a state of being cut by a conventional cutting method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary burner 1a Flame hole 2 Glass tube 3 Local heating part 4 Glass tube feeder 5 Rotary cutter 6 Holding roller 7 Heat distortion part 8 Air blow

Claims (2)

[Claims] 1. A rotary heating device which rotates along a peripheral surface of a glass tube sandwiched by a glass tube feeding device and has a flame hole inside to form a local heating section on the circumference of the glass tube. Next, using a cutter, a linear cut was made along the local heating section, and only the heating section was quenched by the quenching means to form a linear heat-strained section along the cut in the local heating section. A glass tube cutting method. 2. The glass tube cutting method according to claim 1, wherein the quenching means is an air blow.