JP2015117159A - Glass tube cutting apparatus and glass tube cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass tube cutting apparatus that includes a cutter blade and supply means for supplying water to the cutter blade, and cuts a glass tube to a predetermined length by making a cutting flaw in the glass tube by making the cutter blade abut intermittently on an outer peripheral surface of the glass tube to be drawn continuously and that can stably supply a proper amount of water to the cutter blade even when the proper amount of water supplied to the cutter blade is very small.SOLUTION: A cutter blade 101 includes a plurality of plate-like members (namely, a thick cutter blade 101A and a thin cutter blade 101B) which are stacked horizontally to be spaced from each other. Water supplied to the cutter blade 101 is made to permeate the gap between the thick cutter blade 101A and thin cutter blade 101B which adjoin each other.

Description

  The present invention relates to a technique of a glass tube cutting device that cuts a continuously drawn glass tube into a predetermined length.

Conventionally, glass tubes used for, for example, medical ampules and illumination fluorescent tubes are mainly produced by the Danner method.
In the Danner method, a band-like molten glass is wound around the outer peripheral surface of a sleeve that is rotated about an axis while turning the tip portion obliquely downward. The molten glass wound around the sleeve gradually becomes a layer of uniform thickness and flows to the tip of the sleeve. Compressed air is ejected from the front end of the sleeve, and a tube drawing machine is disposed in front of the sleeve. Due to the traction force of the tube drawing machine, the molten glass becomes a glass tube from the front end of the sleeve. Withdrawn.
The glass tube drawn out by the tube drawing machine is once roughly cut into a predetermined length by a glass tube cutting device (see, for example, “Patent Document 1”), and then both ends are cut by a re-cutting / mouth-burning device. Recutting and calcination are performed (see, for example, “Patent Document 1”).
Thus, the glass tube is produced continuously.

  Here, in the glass tube cutting device, a cutter blade containing water is brought into contact with a glass tube that is still in a high temperature state, and a cutting scratch that becomes a cutting origin is put in the glass tube, and a thermal shock is applied from the cutting scratch. A chill cut method is employed in which the glass tube is cut by extending the cracks (see, for example, “Patent Document 2”).

JP 2007-331994 A Japanese Utility Model Publication No. 6-54746

In a glass tube cutting apparatus employing such a chill cut method, it is necessary to always supply an appropriate amount of water to the cutter blade in order to ensure stable quality of the cut surface of the glass tube.
Therefore, in the conventional glass tube cutting device, for example, an appropriate amount of water is supplied to the cutter blade by spraying mist-like water onto the cutter blade together with compressed air via a supply pipe or the like.
However, since the appropriate amount of water is generally a small amount, it is difficult to always stably spray a small amount of water supplied through the supply pipe onto the cutter blade, and the sprayed water is difficult to spray. Since the amount staying in the tube was not constant, the amount of water supplied to the cutter blade was not stable, and the quality of the cut surface of the glass tube after rough cutting was likely to vary.

  The present invention has been made in view of the present problems described above, and includes a cutter blade and a supply means for supplying water to the cutter blade, and the cutter blade is continuously drawn. A glass tube cutting device for cutting the glass tube into a predetermined length by intermittently abutting against the outer peripheral surface of the glass tube to form a cutting flaw on the glass tube, the cutter blade An object of the present invention is to provide a glass tube cutting device and a glass tube cutting method capable of stably supplying an appropriate amount of water to the cutter blade even if the appropriate amount of water supplied to the cutter blade is very small. To do.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, the glass tube cutting device according to claim 1 of the present invention includes a cutter blade and a water supply means for supplying water to the cutter blade, and the outer peripheral surface of the glass tube that is continuously drawn. Is a glass tube cutting device that cuts the glass tube into a predetermined length by forming a cut flaw on the glass tube intermittently with respect to the glass tube, wherein the cutter blade comprises a plurality of plates The plurality of plate-like members are stacked in a horizontal direction so as to have an interval.

  In the glass tube cutting device according to claim 2 of the present invention, the upper portion of the cutter blade is inserted into a rectangular box-shaped cutter holder that opens downward, and between the cutter blade and the cutter holder. A sealing member having a through hole for restricting the place of water is interposed.

  The glass tube cutting device according to claim 3 of the present invention is characterized in that each of the plurality of plate-like members constituting the cutter blade can be finely moved in the vertical direction.

  A glass tube cutting method according to a fourth aspect of the present invention is characterized in that the glass tube is cut by the glass tube cutting device according to any one of the first to third aspects.

  As effects of the present invention, the following effects can be obtained.

  That is, according to the glass tube cutting device according to the first aspect of the present invention, the cutter blade is composed of a plurality of plate-like members, and the plate-like members are stacked in a horizontal direction so as to have an interval. Even if the appropriate amount of water to be supplied is very small, the water will permeate into the gaps between the plate-like members adjacent to each other, and an appropriate amount of water can be stably supplied to the cutter blade. It is possible to cut a glass tube that is continuously drawn into a predetermined length while ensuring stable quality of the cut surface.

According to the glass tube cutting device according to claim 2 of the present invention, the upper end portion of the cutter blade is inserted into the cutter holder, whereby the stacked state of the cutter blade is firmly held.
In addition, by interposing a sealing member between the cutter blade and the cutter holder, it is possible to effectively prevent the upper end portion of the cutter blade from colliding with the lower surface of the top plate portion, and wear of the cutter blade can be prevented. Can be prevented.
Furthermore, since a through hole for restricting the location of the water guided to the upper surface of the cutter blade is formed in the sealing member, an appropriate amount of water can be reliably supplied to a predetermined place (without leaking outside). It is possible to guide to the gap between the plate-like members adjacent to each other.

  According to the glass tube cutting device according to claim 3 of the present invention, water that has permeated into the interval between the plate-like members adjacent to each other by finely moving these plate-like members in the up-down direction is used. It is possible to infiltrate reliably up to the portion that comes into contact with.

  According to the glass tube cutting method of the present invention, the continuously drawn glass tube can be cut to a predetermined length while ensuring a stable cut surface quality.

The partial cross section front view which showed the whole structure of the cutting device provided with the cutter for glass tube cutting which concerns on one Embodiment of this invention. It is the figure which showed the whole structure of the cutter for glass tube cutting | disconnection, Comprising: The partial cross section top view seen from the direction of the arrow A of FIG. Similarly, it is the figure which showed the whole structure of the cutter for glass tube cutting | disconnection, Comprising: The cross-sectional front view seen from the direction of arrow B of FIG.

  Next, embodiments of the invention will be described.

[Cutting device 1]
First, an overall configuration of a glass tube cutting device 1 (hereinafter simply referred to as “cutting device 1”) embodying the present invention will be described with reference to FIG.
In the following description, for convenience, the vertical direction in FIG. 1 is described as the vertical direction of the cutting device 1.

The cutting device 1 is a device for continuously cutting the glass tube T to be drawn into a predetermined length.
The cutting device 1 includes a main shaft 2 having a vertical axis, and the main shaft 2 protrudes from a first housing 4 standing on the upper surface of a horizontal base 3 with its upper end protruding. Inserted.

  The main shaft 2 is pivotally supported via a plurality of bearings 41, 41,. Further, in the first housing 4, a first bevel gear 21 is provided through the lower end portion of the main shaft 2.

On the other hand, on the upper surface of the base 3, a drive motor 5 is disposed adjacent to the first housing 4, and an output shaft 5 a protruding in the horizontal direction from the drive motor 5 is connected via a coupling 6. It is connected to one end of the drive transmission shaft 7 extending in the horizontal direction.
In addition, the drive transmission shaft 7 protrudes from the side surface of the first housing 4 with the other end (the end opposite to the coupling 6 side) inserted into the first housing 4. It is inserted into the housing 8 and is pivotally supported via a plurality of second bearings 81 and 81 housed in the second housing 8.

A second bevel gear 71 is provided through the other end of the drive transmission shaft 7, and the second bevel gear 71 is engaged with the first bevel gear 21, whereby the drive transmission shaft 7 is connected to the main shaft 2.
Thereby, the driving force by the drive motor 5 is transmitted in order to the coupling 6, the drive transmission shaft 7, the second bevel gear 71, and the first bevel gear 21 via the output shaft 5a. 2 is driven to rotate about the axis.

Incidentally, a swivel arm 9 is provided at the upper end of the main shaft 2 (the end protruding upward from the first housing 4).
The swivel arm 9 includes a base portion 9A fixed to the upper end portion of the main shaft 2 and a swing arm 9B connected to the base portion 9A.
Specifically, the swing arm 9B is connected at one end thereof to the horizontal end of the base portion 9A via a connecting pin 91 so that the swing arm 9B can swing in the vertical direction. 9A is provided extending in the horizontal direction. Further, a cutter structure 10 to be described later projects downward from the other end of the swing arm 9B.

  A pipe member 92 is communicated with the other end of the swing arm 9B, and an appropriate amount of water is supplied from a water supply means (not shown) to the cutter blade 101 provided in the cutter structure 10 via the pipe member 92. Is supplied.

  On the other hand, a protruding edge portion 4a is provided on the side surface of the upper end portion of the first housing 4, and a cam surface is formed on the upper surface of the protruding edge portion 4a.

In the cutting apparatus 1 having such a configuration, when the main shaft 2 is rotationally driven by the driving force of the drive motor 5, the swing arm 9 rotates in the horizontal direction about the main shaft 2 in synchronization with the main shaft 2. To do.
At this time, the swing arm 9B slides and moves on the upper surface (cam surface) of the projecting edge portion 4a via the cam roller 93 that is pivotally supported at the center of the lower surface of the swing arm 9B. Along the connecting pins 91, the upper and lower parts swing in the vertical direction.

Then, below the locus of the other end of the swing arm 9B, when the glass tube T is continuously drawn in the horizontal direction, the upper surface of the projecting edge portion 4a is the other end of the swing arm 9B. When passing over the glass tube T, the other end (that is, the cutter structure 10) is lowered, and the cutter blade 101 to which an appropriate amount of water is supplied from the water supply means comes into contact with the upper end of the glass tube T. It has a structure like this.
Thereby, the glass tube T is cut into a predetermined length by inserting a cut flaw that becomes a cutting origin at the upper end portion thereof, and then a crack caused by thermal shock extends from the cut flaw. In this case, since the glass tube T is drawn at a constant speed and the swing arm 9B is swung at a constant speed, the cutter blade 101 contacts the glass tube T at a constant interval, and the glass tube T is fixed. It is continuously cut at a predetermined length.

As described above, in the cutting device 1 according to the present embodiment, the cutter blade 101 to which water is supplied from the water supply means via the piping member 92 is provided, and the cutter blade 101 is continuously drawn. The glass tube T has a predetermined length by being brought into contact with the outer peripheral surface of the tube T intermittently to form a cut flaw on the glass tube T and applying a thermal shock to the cut flaw with water. Disconnected.
Here, in general, when cutting a glass tube T having a large wall thickness and a small expansion coefficient, the impact when the cutter blade 101 abuts on the glass tube T is increased, and water supplied to the cutter blade 101 is increased. Need to be relatively large.
On the other hand, when cutting a thin glass tube T having a large expansion coefficient, the impact when the cutter blade 101 comes into contact with the glass tube T is reduced, and the amount of water supplied to the cutter blade 101 is made very small. There is a need to.
Based on this, in the cutting device 1 according to the present embodiment, by providing the cutter structure 10 to be described later, the amount of water supplied to the cutter blade 101 is stable even if the amount is small. It is possible to be supplied.

  In addition, about the structure of the cutting device 1, it is not limited to the thing of this embodiment, For example, it is provided with the turning arm which turns in a perpendicular direction, and the cutter of the cutter structure 10 with which the front-end | tip part of this turning arm is equipped. The blade 101 may be brought into contact with the glass tube T so that the glass tube T is continuously cut to a predetermined length.

[Cutter structure 10]
Next, the configuration of the cutter structure 10 will be described in detail with reference to FIGS. 2 and 3.
In the following description, for convenience, the vertical direction in FIG. 3 is described as the vertical direction of the cutter structure 10.

The cutter structure 10 is provided, for example, in the turning arm 9 of the cutting device 1 (more specifically, the lower end of the other end of the swing arm 9B), and when the glass tube T is cut by the cutting device 1, The glass tube T is used for making a cut wound to become a cutting origin.
As shown in FIG. 2, the cutter structure 10 is mainly composed of a cutter blade 101, a cutter holder 102, a seal member 103, and the like.

The cutter blade 101 is a member that directly contacts the glass tube T when the glass tube T is cut by the cutting device 1.
The cutter blade 101 is composed of a plurality of rectangular plate-like members. Further, as these plate-like members, a plate-like member having a relatively large thickness (hereinafter referred to as “thick cutter blade 101A” as appropriate) and a plate-like member having a thickness smaller than that of the thick cutter blade 101A ( Hereinafter, two types of plate-like members, which are described as “thin cutter blade 101B” as appropriate, are used.

The cutter blade 101 is composed of a plurality of plate-like members (thick cutter blade 101A and thin cutter blade 101B) stacked in the horizontal direction.
For example, in this embodiment, the cutter blade 101 includes three thick cutter blades 101A, 101A, and 101A, and two thin cutter blades 101B and 101B, and the thick cutter blade 101A, the thin cutter blade 101B, The meat cutter blade 101A, the thin cutter blade 101B, and the thick cutter blade 101A are alternately stacked in the horizontal direction.
An interval through which water can permeate is provided between the thick cutter blade 101A and the thin cutter blade 101B.

  As shown in FIG. 3, for example, a plurality of (two in the present embodiment) long holes extending in the vertical direction are formed in the flat portions of the plurality of thick cutter blades 101 </ b> A and thin cutter blades 101 </ b> B. 101a and 101a are perforated so as to penetrate the same positions of the thick cutter blade 101A and the thin cutter blade 101B. As will be described later, the cutter blade 101 passes through the long holes 101a and 101a. The cutter holder 102 is held by fastening members 104 and 104 such as bolts.

In addition, it is desirable that the cutter blade 101 has thick cutter blades 101A and 101A disposed at least on both sides in the stacking direction in order to ensure sufficient strength against an unexpected external force.
However, the thick cutter blades 101A and the thin cutter blades 101B do not necessarily have to be alternately stacked, and the thick cutter blades 101A and 101A are disposed on both sides in the stacking direction, and the thick cutter blades 101A and 101A are arranged. A plurality of thin cutter blades 101B, 101B,.
Further, in the present embodiment, a total of five cutter blades 101 including three thick cutter blades 101A, 101A, and 101A and two thin cutter blades 101B and 101B are provided. Is not limited to this. For example, the cutter blade 101 is composed of two thick cutter blades 101A and 101A, or is composed of two thick cutter blades 101A and 101A and two thin cutter blades 101B and 101B. It is possible to arrange the cutter blades 101A and 101A on the outside and arrange the two thin cutter blades 101B and 101B on the inside.

  Moreover, about the material of the cutter blade 101, since an appropriate amount of water is successively supplied, it is desirable that the cutter blade 101 is made of a material other than iron. For example, the thick cutter blade 101A is preferably formed of heat resistant steel in consideration of wear resistance, and the thin cutter blade 101B is formed of stainless steel in consideration of processability. It is desirable.

Next, the cutter holder 102 will be described.
The cutter holder 102 is a member for holding the stacked state of the cutter blades 101.
The cutter holder 102 is formed in a rectangular box shape that opens downward, and includes a top plate portion 102a and a peripheral portion 102b that protrudes downward along the edge of the top plate portion 102a.

The upper part of the cutter blade 101 described above is inserted into the cutter holder 102 from below the cutter holder 102.
Thereby, the cutter blade 101 is firmly held around the upper end by the peripheral edge 102 b of the cutter holder 102.
As a result, the thick cutter blade 101 </ b> A and the thin cutter blade 101 </ b> B constituting the cutter blade 101 are firmly held in the stacked state except for the vertical movement.

Further, as described above, the thick cutter blade 101A and the thin cutter blade 101B are held on the cutter holder 102 by the fastening members 104 and 104 through the plurality of long holes 101a and 101a.
As a result, the plurality of cutter blades 101, 101,... Constituting the cutter blade 101 are restricted from moving in the vertical direction within a range in which the fastening member 104 is relatively slidable within the long hole 101a. The
That is, the thick cutter blade 101 </ b> A and the thin cutter blade 101 </ b> B constituting the cutter blade 101 are configured to be finely movable in the vertical direction (vertical direction) while being held in a stacked state by the cutter holder 102.

Incidentally, the cutter holder 102 is fixed to the lower surface of the other end portion of the swing arm 9B described above on the upper surface of the top plate portion 102a.
On the other hand, a through hole 102c is perforated in the center of the flat surface of the top plate portion 102a, and the distal end portion of the piping member 92 communicated with the other end portion of the swing arm 9B is inserted into the through hole 102c. The
Thus, the water supplied by the piping member 92 is always guided to the inside of the cutter holder 102, that is, the upper surface of the cutter blade 101.

Next, the seal member 103 will be described.
The seal member 103 prevents the collision between the upper surface of the cutter blade 101 (that is, the upper end portion of the plurality of cutter blades 101, 101...) And the lower surface of the top plate portion 102a of the cutter holder 102. This is a member for preventing wear of each cutter blade 101.
Further, the seal member 103 is a member for restricting the place of water led to the upper surface of the cutter blade 101 through the piping member 92.

The seal member 103 is made of, for example, an elastic member or a thermoplastic member.
The seal member 103 is made of a rectangular plate member having the same shape as the upper surface of the cutter blade 101.

The seal member 103 is placed on the upper surface of the cutter blade 101 and is inserted into the cutter holder 102 together with the cutter blade 101.
Thereby, the sealing member 103 is interposed between the upper surface of the cutter blade 101 and the lower surface of the top plate portion 102a of the cutter holder 102, and the upper end portions of the plurality of cutter blades 101, 101. It is possible to effectively prevent a collision with the lower surface of the portion 102a.

Further, as shown in FIG. 2, a long hole (through hole) 103 a is drilled in the center of the planar surface of the seal member 103.
The long hole 103a communicates with the upper ends of all the cutter blades 101, 101,... Constituting the cutter blade 101 in a state where the seal member 103 is placed on the upper surface of the cutter blade 101. The cutter blade 101 is formed so as to extend in the stacking direction.

As shown in FIG. 3, since the through hole 102c of the cutter holder 102 communicates with the long hole 103a, the distal end portion of the piping member 92 is connected to the long hole 103a via the through hole 102c. Communicated.
Thereby, the place where the water led to the upper surface of the cutter blade 101 via the piping member 92 is restricted in the long hole 103a.

  According to the cutter structure 10 in the present embodiment having the above-described configuration, even if an appropriate amount of water supplied to the cutter blade 101 is a minute amount, all the thick walls constituting the cutter blade 101 are formed. An appropriate amount of water can be stably supplied to the cutter blade 101A and the thin cutter blade 101B.

  That is, as described above, the water supplied from the water supply means via the piping member 92 is controlled in its location by the long hole 103a of the seal member 103, and the thick cutter blade 101A and the thin wall are stacked adjacent to each other. Since it gradually permeates into a small gap between the cutter blades 101B, even if an appropriate amount of water is a minute amount, it can be stably supplied.

Further, in the cutter structure 10 in the present embodiment, as described above, the thick cutter blade 101A and the thin cutter blade 101B constituting the cutter blade 101 are within a slight range in the vertical direction in the cutter holder 102. It is supposed to be provided with fine movement.
Therefore, when water permeates between the adjacent cutter blades 101 and 101, water can be permeated more reliably by finely moving these cutter blades 101 and 101 relatively vertically.

1 Cutting device (glass tube cutting device)
101 Cutter blade 101A Thick cutter blade 101B Thin cutter blade 102 Cutter holder 103a Long hole (through hole)
T glass tube

Claims (4)

A cutter blade and water supply means for supplying water to the cutter blade are provided, and the cutter blade is intermittently brought into contact with the outer peripheral surface of the continuously drawn glass tube, and cut into the glass tube. A glass tube cutting device that cuts the glass tube into a predetermined length by forming a scratch,
The cutter blade comprises a plurality of plate-like members,
The plurality of plate-like members are stacked in a horizontal direction so as to have an interval,
A glass tube cutting device. The upper part of the cutter blade is inserted into a rectangular box-shaped cutter holder that opens downward,
Between the cutter blade and the cutter holder, a seal member having a through hole for restricting the place of the water is interposed,
The glass tube cutting device according to claim 1, wherein: The plurality of plate members constituting the cutter blade are:
Each can be finely moved vertically,
The glass tube cutting device according to claim 1 or 2, characterized by the above. A glass tube is cut by the glass tube cutting device according to any one of claims 1 to 3,
The glass tube cutting method characterized by the above-mentioned.

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