JP7070236B2 - Tubular glass cutting device and tubular glass cutting method - Google Patents

Description

The present invention relates to a tubular glass cutting device and a tubular glass cutting method for cutting tubular glass to a predetermined length to form tube glass.

A tubular glass cutting device that cuts continuous tubular glass to a predetermined length to form a tube glass is well known. In this tubular glass cutting device, for example, a laser is used to form a crack (scribing) in a tubular glass by a laser, and the crack is extended and broken by the bending stress applied to the tubular glass to obtain a tube glass having a predetermined length. The formula is well known (see Patent Document 1 and the like).

Japanese Unexamined Patent Publication No. 2017-77991

By the way, in this kind of tubular glass cutting device, it is desired to simplify the device by simply cutting the tubular glass after crack formation.
An object of the present invention is to provide a tubular glass cutting device and a tubular glass cutting method that enable simplification of the folded structure of tubular glass.

The tubular glass cutting device that solves the above-mentioned problems has a configuration in which cracks formed in the tubular glass are extended and the tubular glass is cut by applying bending stress to the tubular glass with a jig. The jig is an eccentric roller that applies bending stress to the tubular glass by eccentric rotation.

According to this configuration, the structure in which the tubular glass is folded by applying bending stress is a structure using an eccentric roller, and the tubular glass can be cut by the rotation of the eccentric roller. Therefore, it is possible to simplify the folded structure of the tubular glass.

In the tubular glass cutting device, the eccentric roller is preferably a roller having a groove for positioning the tubular glass. According to this configuration, when the tubular glass is broken, the tubular glass can be positioned at a predetermined position by a roller having a groove. Therefore, it is possible to ensure good quality of the glass end face after folding.

In the tubular glass cutting device, the eccentric roller may include a first surface for applying bending stress to the tubular glass and a second surface for applying bending stress larger than the first surface to the tubular glass. preferable. According to this configuration, when cracks are formed, the first surface of the eccentric roller applies stress to the tubular glass, and when the tubular glass is folded, the second surface of the eccentric roller applies more stress to the tubular glass than when cracks are formed. Can be given. Therefore, it is possible to apply an appropriate bending stress to the tubular glass according to each step of crack formation and glass folding.

The tubular glass cutting device preferably includes a laser light irradiating device that forms cracks in the tubular glass by irradiating the tubular glass with a laser. According to this configuration, stable cracks are formed by the laser, and the tubular glass can be broken.

The tubular glass cutting method for solving the above problems is a method of applying bending stress to the tubular glass with a jig to extend cracks formed in the tubular glass and cut the tubular glass. The jig is an eccentric roller that applies bending stress to the tubular glass by eccentric rotation.

In the tubular glass cutting method, the tubular glass is cracked in a state where bending stress is applied to the tubular glass by an eccentric roller, and the crack is extended by increasing the bending stress to extend the tubular glass. It is preferable to cut the glass. According to this configuration, bending stress is applied to the tubular glass in advance from the eccentric roller at the time of crack formation, so that the bending stress required for breaking the tubular glass can be smoothly increased to break the tubular glass. It will be possible.

According to the present invention, the folded structure of the tubular glass can be simplified.

The block diagram of the tube glass manufacturing apparatus of one Embodiment. Configuration diagram of the tubular glass cutting device. Perspective view of the eccentric roller. Side view of the eccentric roller. (A) and (b) are explanatory views of the crack formation process. (A) and (b) are explanatory views of the folding process.

Hereinafter, an embodiment of the tubular glass cutting device and the tubular glass cutting method will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, the tube glass manufacturing apparatus 1 includes a glass melting furnace 2 that melts a glass raw material to generate molten glass M, a muffle furnace 3 that draws and forms the molten glass M into a tubular shape, and a muffle furnace 3. It is provided with an annealing device 4 for annealing (heat-treating) the tubular glass G (continuous tube glass) sent from the glass, and a tube drawing device 5 for forming the tubular glass G after the annealing process. Further, the tube glass manufacturing device 1 includes a tubular glass cutting device 6 that cuts the tubular glass G towed by the tube pulling device 5, and a conveyor 7 that conveys the tube glass G'after cutting.

The muffle furnace 3 includes a sleeve 8 that rotates around the axis L1 to form the molten glass M into a tubular shape (tubular glass G). The sleeve 8 is made of, for example, a cylindrical refractory material. The sleeve 8 is partially formed in a tapered shape, and is arranged in a state where the small diameter side end portion 9 of the tapered portion faces diagonally downward. The sleeve 8 is rotated by a drive device 11 connected via a shaft 10 to wind the molten glass M supplied from the glass melting furnace 2 in a cylindrical shape and form a tubular shape from the side of the small diameter side end portion 9. Drawer molding. The molten glass M formed by drawing out into a tubular shape is continuously drawn out as the tubular glass G to the outside of the muffle furnace 3.

The annealing 4 removes the strain of the tubular glass G by a predetermined annealing treatment. The temperature of the annealing treatment, the heating time, and the like are set to various values as needed.
The tube pulling device 5 pulls the molten glass M drawn out in a tubular shape in the muffle furnace 3 and the tubular glass G passing through and passing through the annealing 4 at a constant speed to cut the tubular glass G into a tubular glass cutting device 6. To transport to. The tube pulling device 5 of this example is adjusted to a predetermined outer diameter by pulling the tube to the downstream side while sandwiching the upper part and the lower part of the tubular glass G by a pair of transport belts (not shown). The tubular glass G is conveyed to the tubular glass cutting device 6.

As shown in FIG. 2, the tubular glass cutting device 6 cuts the tubular glass G to a predetermined length by forming a crack (also referred to as a scribing) in the tubular glass G by a laser and then applying bending stress to the tubular glass G to form a tube glass. Process to G'. In this case, the tubular glass cutting device 6 folds the tubular glass G by forming a crack forming portion 12 that forms a crack in a part of the tubular glass G in the circumferential direction and by applying bending stress to the tubular glass G to extend the crack. A crack extending portion 13 for breaking is provided.

The crack forming portion 12 is a laser light irradiation device 12a that forms a crack in the tubular glass G by a laser. The laser light irradiation device 12a is preferably, for example, a multiphoton absorption laser. Further, the laser light irradiation device 12a forms a crack in a part of the tubular glass G by partially irradiating the tubular glass G with a laser from one direction.

The crack extending portion 13 folds the tubular glass G in contact with the holding roller 14 that holds the conveyed tubular glass G from one side, the support roller 15 that supports the tubular glass G from the other side, and the tubular glass G. A jig 16 for breaking is provided. The holding roller 14, the support roller 15, and the jig 16 are arranged side by side in this order along the transport path L2 of the tubular glass G. The holding roller 14 and the supporting roller 15 are positioned so as to sandwich the conveyed tubular glass G.

As shown in FIG. 3, the jig 16 is an eccentric roller 16a that applies bending stress to the tubular glass G by eccentric rotation to break the tubular glass G. Further, the eccentric roller 16a is a roller having a groove 17 for positioning the tubular glass G. The eccentric roller 16a of this example is preferably a V roller having an English letter V-shaped groove 17. The eccentric roller 16a rotates at a constant speed using a servomotor or the like as a drive source when processing the tubular glass G. The groove 17 is formed along the entire circumference of the eccentric roller 16a around the rotation axis 18 (direction of the rotation arrow A shown in the figure). The V roller (eccentric roller 16a) positions the conveyed tubular glass G in the conveying direction and the vertical direction.

As shown in FIG. 4, the groove 17 of the eccentric roller 16a includes a pushing surface 19 that applies bending stress to the tubular glass G. The push-in surface 19 is formed by changing the depth of the groove with respect to other portions in the groove 17.

The eccentric roller 16a can apply a predetermined stress when forming a crack in the tubular glass G, and after the crack formation, applies a bending stress F larger than the stress when forming the crack to the tubular glass G. The tubular glass G is formed into a shape capable of cutting the tubular glass G. In the case of this example, the eccentric roller 16a (pushing surface 19) has a first surface 20 that applies a predetermined bending stress to the tubular glass G, and a tubular glass that applies a bending stress larger than the bending stress applied to the first surface 20. It is provided with a second surface 21 to be given to G. The first surface 20 is a portion that applies bending stress to the tubular glass G during crack formation. The second surface 21 is a portion that applies bending stress to the tubular glass G when the tubular glass G after crack formation is broken.

Next, the operation and effect of the tubular glass cutting device 6 will be described with reference to FIGS. 5 and 6.
As shown in FIG. 5A, when the tubular glass G is conveyed to the cutting position, the laser light irradiation device 12a irradiates the tubular glass G with the laser LA, and cracks C are formed in the tubular glass G (. Crack formation step). The laser LA irradiates the tubular glass G at a focal length that reaches the inside of the tubular glass G. At this time, as the eccentric roller 16a rotates in the folding direction A, the first surface 20 of the grooves 17 (pushing surface 19) comes into contact with the tubular glass G, and bending stress is applied from the first surface 20 to the tubular glass G. Is added. Further, the bending stress at this time may not be a large load enough to break the tubular glass G, but may be a force having a magnitude sufficient to appropriately support the tubular glass G.

As shown in FIG. 5B, the laser light irradiating device 12a of this example scans the laser LA from “B1” to “B2” in the circumferential direction of the tubular glass G while changing the focal length of the laser LA, for example. By doing so, a crack C having a predetermined length is formed. In the case of this example, the crack C is formed in a straight line extending in a direction orthogonal to the line connecting the center Pr of the crack C and the axial center Pk of the tubular glass G.

Here, the thickness of the tubular glass G (tube glass G') is "w", and the outer diameter is "r". In the case of this example, the thickness w is preferably set to 0.2 to 2 mm, and the outer diameter r, which is the distance from the axis center Pk of the tubular glass G, is preferably set to 1 to 50 mm. ..

As shown in FIGS. 6A and 6B, after the crack C is formed in the tubular glass G, the tubular glass G is folded by the eccentric roller 16a (folding step). In the case of this example, as shown in FIG. 6B, the tubular glass G is pulled out while being rotated by the sleeve 8, so that when the tubular glass G reaches the folding position, the crack C is in the circumferential direction of the tubular glass G. Move a predetermined distance in.

When the tubular glass G is folded, the second surface 21 of the groove 17 (pushing surface 19) comes into contact with the tubular glass G as the eccentric roller 16a further rotates in the folding direction A, and the tubular glass G is tubular from the second surface. The bending stress F required for folding is applied to the glass G. The bending stress F at this time is set to the force required to break the tubular glass G.

When the bending stress F of the folding split is applied to the tubular glass G, the crack C extends from the ends of the cracks C (crack ends 22a and 22b) as a base point. Here, the crack C extends from both ends of the crack C, and this becomes the crack extension 23 (one is referred to as “23a” and the other is referred to as “23b”). That is, the crack extensions 23a and 23b extending from the crack ends 22a and 22b extend to the confluence point S, and the tubular glass G is divided at the confluence timing. In this way, the continuous tubular glass G is cut to a predetermined length to form a tube glass G'.

After the tubular glass G is folded, the tube glass G'is produced from the remaining tubular glass G by the same procedure. Then, by repeating the above steps, a plurality of tube glasses G'are manufactured from the tubular glass G that is continuously molded.

In the case of this example, the structure in which the tubular glass G after crack formation is folded by applying bending stress F is a structure using an eccentric roller 16a, and the tubular glass G after crack formation is cut by the rotation of the eccentric roller 16a. It becomes possible. Therefore, the folded structure of the tubular glass G can be simplified.

The eccentric roller 16a is a roller (V roller) having a groove 17 (English letter V-shaped groove 17) for positioning the tubular glass G. As a result, when the tubular glass G is folded, the tubular glass G can be positioned at a predetermined position. Therefore, good quality of the glass end face after folding can be ensured.

The eccentric roller 16a has a first surface 20 that applies a predetermined bending stress to the tubular glass G, and a second surface 21 that applies a bending stress larger than the bending stress applied by the first surface 20 to the tubular glass G. Be prepared. Therefore, at the time of crack formation, bending stress is applied to the tubular glass G by the first surface 20 of the eccentric roller 16a, and at the time of folding the tubular glass G, the second surface 21 of the eccentric roller 16a bends more than at the time of crack formation. The stress F can be applied to the tubular glass G. Therefore, an appropriate bending stress F can be applied to the tubular glass G from the eccentric roller 16a according to each step of crack formation and glass folding.

In the crack forming step, the tubular glass G is irradiated with the laser LA to form the crack C in the tubular glass G. Therefore, a stable crack C is formed by the laser LA, and the tubular glass G can be broken.

In this example, a crack C is formed in the tubular glass G in a state where bending stress is applied to the tubular glass G by the eccentric roller 16a, and the crack C is extended by increasing the bending stress to form the tubular glass G. Disconnect. In this case, since bending stress is applied to the tubular glass G in advance by the eccentric roller 16a at the time of crack formation, the bending stress required for folding the tubular glass G is smoothly increased to break the tubular glass G. Is possible.

In addition, this embodiment can be changed and carried out as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
The method is not limited to the method of folding one tubular glass G by one rotation of the eccentric roller 16a, and may be a method of folding one tubular glass G for each half rotation of the eccentric roller 16a, for example.

The first surface 20 and the second surface 21 of the eccentric roller 16a are not limited to continuous surfaces that are continuous with each other, and may be divided surfaces that are not continuous.
The crack C is not limited to being formed only inside the tubular glass G, and may be exposed on the front surface or the back surface.

The shape of the crack C is not limited to a linear shape on the end face of the glass, and may be changed to another shape such as an arc shape along the circumferential direction of the tubular glass G.
-The width, thickness, inclination, etc. of the crack C can be appropriately changed to an embodiment other than the embodiment.

-The crack forming step and the folding step are not limited to being performed at the same time, and a time difference may be provided between these steps to make them asynchronous. In this case, the crack C may be formed so as not to partially overlap the line along the direction of the bending stress F (line Lc in the weighting direction), for example.

The laser LA irradiated to the tubular glass G is not limited to the multiphoton absorption laser, and other types of laser LA may be adopted.
-When irradiating the laser LA to form the crack C, any mode of irradiation of the laser LA may be adopted as long as the required crack C can be formed.

The crack forming portion 12 is not limited to the laser type, and may be changed to another type such as mechanically forming a crack C.
The eccentric roller 16a is not limited to the shape having the first surface 20 and the second surface 21, and may have a shape capable of applying bending stress F to the tubular glass G.

The eccentric roller 16a is not limited to the V roller, and may be any roller as long as the rotating shaft 18 is present at the eccentric position.
The roller having a groove is not limited to the V roller, and may be, for example, a U roller having a U-shaped groove in English letters or a roller having a katakana U-shaped groove in which the bottom angle of the groove is approximately 90 °. good.

The position of the support roller 15 is not limited to, for example, being directly below the laser light irradiation device 12a. For example, the support roller 15 may be arranged on the conveyor 7 side or the muffle furnace 3 side with respect to the laser light irradiation device 12a in the transport direction of the tubular glass G.

-During the crack forming step, the bending stress F is not limited to being applied from the eccentric roller 16a to the tubular glass G, and cracks may be formed in a state where the bending stress is not applied.
-The tube glass manufacturing apparatus 1 can appropriately adopt a configuration other than the embodiment.

1 ... tube glass manufacturing device, 6 ... tubular glass cutting device, 12a ... laser light irradiation device, 16 ... jig, 16a ... eccentric roller (V roller), 17 ... groove, 20 ... first surface, 21 ... second surface , G ... Tubular glass, G'... Tube glass, C ... Crack, F ... Bending stress, LA ... Laser.

Claims (5)

A tubular glass cutting device that stretches cracks formed in the tubular glass and cuts the tubular glass by applying bending stress to the tubular glass with a jig.
The jig is an eccentric roller that applies bending stress to the tubular glass by eccentric rotation .
The eccentric roller is a tubular glass cutting device that is a roller having a groove for positioning the tubular glass. The tubular glass cutting according to claim 1 , wherein the eccentric roller includes a first surface for applying bending stress to the tubular glass and a second surface for applying bending stress larger than the first surface to the tubular glass. Device. The tubular glass cutting device according to claim 1 or 2 , further comprising a laser light irradiating device for forming the crack in the tubular glass by irradiating the tubular glass with a laser. A tubular glass cutting method for cutting the tubular glass by extending cracks formed in the tubular glass by applying bending stress to the tubular glass with a jig.
The jig is an eccentric roller that applies bending stress to the tubular glass by eccentric rotation.
The tubular glass cutting method , wherein the eccentric roller is a roller having a groove for positioning the tubular glass. 4. The fourth aspect of the present invention, in which a crack is formed in the tubular glass in a state where bending stress is applied to the tubular glass by the eccentric roller, and the crack is extended by increasing the bending stress to cut the tubular glass. The tubular glass cutting method described in.

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