JP2017014069A - Production device of glass article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production device of a glass article capable of restraining that a glass ribbon is damaged by contact with a traction roller.SOLUTION: The glass ribbon production device 11 includes: a mold section 12 for flow-down molding the glass ribbon G; and a roller group R provided at the lower side of the mold 12, which pulls the glass ribbon G. In the roller group R, a second traction roller 14 with a maximum hardness set lower than that of a first roller 13, is arranged at a down stream side of the first roller 13. At the downstream side of the second traction roller 14, a third traction roller 15 with a maximum hardness set lower than that of the second traction roller 14, is arranged.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a glass article manufacturing apparatus that manufactures a glass ribbon (band glass) by, for example, an overflow downdraw method.

  2. Description of the Related Art Conventionally, a glass ribbon manufacturing apparatus that manufactures a glass ribbon includes a forming unit for forming molten glass into a strip shape, and a plurality of glass ribbons flowing down from the forming unit are disposed along the flow direction of the glass ribbon. It is comprised so that it may be pulled with the pulled pulling roller (for example, refer patent document 1). Further, the glass ribbon is gradually cooled while being pulled by the pulling roller, and is conveyed to a subsequent process such as a cutting process.

Japanese Patent No. 4753067

  In the glass ribbon manufacturing apparatus as described above, the glass ribbon gradually cools in the process of being pulled by the pulling roller and the viscosity increases (that is, solidifies gradually), so that the glass ribbon contacts the pulling roller. Could cause damage.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a glass article manufacturing apparatus capable of suppressing damage to a glass ribbon due to contact with a pulling roller.

  An apparatus for manufacturing a glass article that solves the above-described problem is a manufacturing apparatus for a glass article that pulls a glass ribbon that is flow-down molded from a forming unit with a plurality of pulling rollers, wherein the plurality of pulling rollers include an upstream pulling roller, A downstream traction roller disposed downstream of the upstream traction roller and having a lower hardness than the upstream traction roller.

  According to this configuration, the hardness of the downstream pulling roller is set lower than the hardness of the upstream pulling roller. As a result, the downstream portion of the glass ribbon, which has a low temperature and is easily damaged, can be configured to be pulled by the downstream pulling roller having a low hardness, and as a result, damage to the glass ribbon due to contact with the pulling roller can be suppressed. .

  An apparatus for manufacturing a glass article that solves the above-described problem is a manufacturing apparatus for a glass article that pulls a glass ribbon that is flow-down molded from a forming unit with a plurality of pulling rollers, wherein the plurality of pulling rollers include an upstream pulling roller, A downstream pulling roller disposed downstream of the upstream pulling roller, and the downstream pulling roller is made of the same material as the upstream pulling roller and is bulkier than the upstream pulling roller. The density is set low.

  According to this configuration, the bulk density of the downstream pulling roller is set lower than the bulk density of the upstream pulling roller. Since the downstream pulling roller and the upstream pulling roller are made of the same material, the lower the bulk density, the lower the hardness. Therefore, it is possible to suppress the damage of the glass ribbon due to the contact with the pulling roller.

  In addition, the upstream side pulling roller tends to wear more easily than the downstream side pulling roller because the temperature of the glass ribbon is higher on the upstream side. Further, when the downstream pulling roller and the upstream pulling roller are made of the same material as described above, it can be said that the higher the hardness (bulk density), the more advantageous in terms of wear resistance. For this reason, by setting the bulk density of the upstream pulling roller to be higher than the bulk density of the downstream pulling roller, it is possible to suppress wear of the upstream pulling roller while suppressing damage to the glass ribbon as described above. it can.

  In the glass article manufacturing apparatus, the upstream pulling roller and the downstream pulling roller are respectively disposed above and below a position where the temperature of the glass ribbon formed by the flow-down forming from the forming portion becomes a strain point. preferable.

  According to this configuration, since the portion below the strain point that is particularly easily damaged in the glass ribbon can be configured to be pulled by the downstream pulling roller having a low hardness (bulk density), the glass ribbon is further damaged. It can suppress suitably.

In the glass article manufacturing apparatus, the upstream pulling roller and the downstream pulling roller are preferably formed by compressing a plurality of disk members stacked in the axial direction in the axial direction.
According to this configuration, it is possible to adjust the bulk density of the upstream and downstream traction rollers by adjusting the degree of axial compression applied to the plurality of disk members when forming the upstream and downstream traction rollers. The bulk density of the upstream and downstream pulling rollers, and hence the hardness can be easily adjusted.

  According to the glass article manufacturing apparatus of the present invention, damage to the glass ribbon due to contact with the pulling roller can be suppressed.

(A) is a schematic block diagram which shows the glass ribbon manufacturing apparatus of embodiment, (b) is a schematic cross section of the glass ribbon manufacturing apparatus. It is a model perspective view for demonstrating the measurement of surface hardness in a pulling roller. It is a model perspective view for demonstrating the pulling roller of another example.

  Hereinafter, an embodiment of a manufacturing apparatus for manufacturing a glass ribbon (band glass) as an example of a glass article will be described with reference to the drawings. Note that in the drawings, for convenience of explanation, some components may be exaggerated or simplified. Further, the dimensional ratio of each part may be different from the actual one.

  As shown in FIGS. 1A and 1B, the glass ribbon manufacturing apparatus 11 includes a forming unit 12 that forms the glass ribbon G using a downdraw method. The glass ribbon manufacturing apparatus 11 of the present embodiment is an apparatus that manufactures a glass ribbon G by using an overflow downdraw method that is a kind of downdraw method. In addition, as a use of the glass ribbon G, a display use, a touch panel use, a photoelectric conversion panel use, an electronic device use, a window glass use, a building material use, and a vehicle use are mentioned, for example.

  As shown in FIG.1 (b), the shaping | molding part 12 of the glass ribbon manufacturing apparatus 11 has the groove | channel 12a which overflows the molten glass MG, and the 1st guide surface 12b and 2nd guide which guide the flow of the molten glass MG which overflowed. Surface 12c. The second guide surface 12c is located on the opposite side of the first guide surface 12b, and the molten glass MG flowing down along the first guide surface 12b and the second guide surface 12c is fused at the lower end of the molding portion 12. Thus, the glass ribbon G is formed.

  A slow cooling furnace (not shown) is provided below the molding unit 12. The temperature of the glass ribbon G flowing down from the forming unit 12 is controlled so that the glass ribbon G is gradually cooled at a predetermined temperature gradient toward the downstream side in the slow cooling furnace.

  As shown in FIGS. 1 (a) and 1 (b), the glass ribbon manufacturing apparatus 11 includes a roller group R composed of a plurality of pulling rollers in the slow cooling furnace disposed below the forming unit 12. . The roller group R includes a first pulling roller 13, a second pulling roller 14, and a third pulling roller 15 in order from the upstream side in the flow direction Z of the glass ribbon G.

  The first pulling roller 13 sandwiches both ends in the width direction X of the glass ribbon G in the thickness direction Y, and a total of four first pulling rollers 13 are provided at both ends in the width direction X of the glass ribbon G. Yes. In the present embodiment, the first pulling roller 13 is connected so that the front side and the back side of the glass ribbon G can be integrally rotated by one rotating shaft 16 respectively. Each first pulling roller 13 is configured to receive a rotational driving force from a motor (not shown) via a rotating shaft 16 so that the first pulling roller 13 is rotationally driven by driving the motor. It has become.

  Similarly, the second pulling roller 14 at the next stage of the first pulling roller 13 also sandwiches both end portions in the width direction X of the glass ribbon G in the thickness direction Y, and both ends in the width direction X of the glass ribbon G. A total of four are provided for each part. In the present embodiment, the second pulling roller 14 is connected so that the front side and the back side of the glass ribbon G can be integrally rotated by one rotating shaft 17 respectively. Each second pulling roller 14 is configured to receive a rotational driving force from a motor (not shown) via a rotating shaft 17 so that the second pulling roller 14 is driven to rotate by driving the motor. It has become.

  Similarly, the third pulling roller 15 at the next stage of the second pulling roller 14 sandwiches both end portions in the width direction X of the glass ribbon G in the thickness direction Y, and both ends of the glass ribbon G in the width direction X. A total of four are provided for each part. In the present embodiment, the third pulling roller 15 is connected so that two of the front side and the back side of the glass ribbon G can be integrally rotated by one rotating shaft 18 respectively. Each third pulling roller 15 is configured to receive a rotational driving force from a motor (not shown) via a rotating shaft 18 so that the third pulling roller 15 is rotationally driven by driving the motor. It has become.

  The first to third pulling rollers 13 to 15 pull the glass ribbon G in the flow-down direction Z by rotating by driving the motor while sandwiching both end portions in the width direction X of the glass ribbon G. The glass ribbon G pulled in the flow-down direction Z by the first to third pulling rollers 13 to 15 is conveyed to a subsequent process such as a cutting process.

Next, the arrangement based on the surface hardness of each of the pulling rollers 13 to 15 will be described.
In each of the pulling rollers 13 to 15, the surface hardness is measured at a plurality of points, and the maximum value of the surface hardness for each of the pulling rollers 13 to 15 is determined from the plurality of measurement results. The maximum values of the surface hardness of the pulling rollers 13 to 15 are set as the maximum hardness of the pulling rollers 13 to 15, and the pulling rollers 13 to 15 are arranged so that the maximum hardness is sequentially decreased from the upstream side. In this embodiment, a contact type or non-contact type hardness meter is used to measure the surface hardness of each traction roller 13-15, and the width direction (rotational axis direction) and circumferential direction of each traction roller 13-15 are used. Further, measurement is performed at a plurality of measurement points P (see FIG. 2).

Here, when the maximum hardness of the first pulling roller 13 is H ₁ , the maximum hardness of the second pulling roller 14 is H ₂ , and the maximum hardness of the third pulling roller 15 is H ₃ , H ₁ > H ₂ > H ₃ It is configured to satisfy. That is, _assuming that the maximum hardness of each of the pulling rollers 13 to 15 is H _n (where n = 1, 2, 3 in order from the uppermost pulling roller), H _n ≧ H _{n + 1} and the uppermost first pulling roller 13. maximum hardness _{H 1>} each puller rollers 13 to 15 so as to satisfy the maximum hardness _{H 3} of the third traction roller 15 of the lowermost is disposed. As a result, the maximum hardness H ₂ , H _{3 of} the second and third pulling rollers 14, 15 exceeds the maximum hardness H ₁ , H ₂ of the first and second pulling rollers 13, 14 of the preceding stage. it is no, also configured such that the maximum hardness H ₃ of the third traction roller 15 of the bottom is lower than the maximum hardness H ₁ of the first pull roll 13 at the uppermost stage.

  In the present embodiment, the position where the glass ribbon G reaches the strain point (strain point SP) is set between the second pulling roller 14 and the third pulling roller 15. In other words, the second pulling roller 14 and the third pulling roller 15 are respectively disposed above and below the strain point position SP.

Next, the operation of this embodiment will be described.
The glass ribbon G flow-down molded from the molding unit 12 is pulled downward by the first to third pulling rollers 13 to 15 and gradually cooled in the process of being pulled by the pulling rollers 13 to 15 so as to have a viscosity. Is getting higher. That is, the glass ribbon G is in a state where the temperature is lower and harder toward the downstream side, and is easily damaged by an external force. Therefore, in the present embodiment, the maximum hardnesses H ₁ , H ₂ , and H ₃ of the first to third pulling rollers 13 to 15 satisfy H ₁ > H ₂ > H ₃ , that is, the maximum hardness of the downstream pulling roller. Each of the pulling rollers 13 to 15 is disposed so as to be low. Thereby, since the hardness setting of each pulling roller 13-15 according to the viscosity (hardness) of the glass ribbon G that gradually increases as it is pulled downward, each pulling roller 13-15 pinches the glass ribbon G. Thus, the glass ribbon G is prevented from being damaged when towed.

  In the present embodiment, only the third pulling roller 15 having the lowest maximum hardness among the pulling rollers 13 to 15 is disposed downstream of the strain point position SP of the glass ribbon G. Thereby, since it can be set as the structure which pulls the part below the distortion point position SP in the state which is especially easy to damage in the glass ribbon G with the 3rd pulling roller 15 with the largest maximum hardness, damage to the glass ribbon G is more suitable. Can be suppressed.

Next, characteristic effects of the present embodiment will be described.
(1) In the roller group R provided below the forming unit 12, the downstream side of the first pulling roller 13 serving as the upstream pulling roller is set downstream with the maximum hardness lower than that of the first pulling roller 13. A second pulling roller 14 as a side pulling roller is disposed. Further, on the downstream side of the second pulling roller 14 serving as the upstream pulling roller, a third pulling roller 15 serving as the downstream pulling roller whose maximum hardness is set lower than that of the second pulling roller 14 is disposed. . As a result, the downstream portion of the glass ribbon G that is low in temperature and easily damaged can be pulled by the second and third pulling rollers 14 and 15 having low hardness, and as a result, contact with the pulling rollers 13 to 15. The damage of the glass ribbon G due to can be suppressed.

  (2) The second pulling roller 14 and the third pulling roller 15 are respectively disposed above and below a position (strain point position SP) at which the temperature of the glass ribbon G formed by flow forming from the forming unit 12 becomes a strain point. Thereby, since it can be set as the structure which pulls the part below the distortion point position SP in the state which is especially easy to damage in the glass ribbon G with the 3rd pulling roller 15 with the largest maximum hardness, damage to the glass ribbon G is more suitable. Can be suppressed.

In addition, you may change the said embodiment as follows.
In the above embodiment, the maximum hardness H ₁ , H ₂ , H ₃ of the first to third pulling rollers 13 to 15 is configured to satisfy H ₁ > H ₂ > H ₃ , but H _n ≧ H _{n + 1} , and, if they meet the H _1> H _3, it may be changed to aspects other than the above embodiments. In other words, the relationship between the maximum hardness H ₁ , H ₂ , H ₃ of the _first to third pulling rollers 13 to 15 is H ₁ = H ₂ > H ₃ or H ₁ > H ₂ = H _3. May be. In these cases, it is preferable that the strain point position SP is set between the pulling rollers having different maximum hardness before and after among the pulling rollers 13 to 15. That is, when H ₁ = H ₂ > H ₃ , it is preferable that the strain point position SP is set between the second pulling roller 14 and the third pulling roller 15, and H ₁ > H ₂ = H _3. In this case, the strain point position SP is preferably set between the first pulling roller 13 and the second pulling roller 14.

  Although not specifically mentioned in the above embodiment, the first to third pulling rollers 13 to 15 may be made of the same material or different materials. In addition, as a structure of each pulling roller 13-15, it consists of the material which shape | molded the fibrous member cylindrically, and solidified the outer peripheral surface with the chemical | medical solution, or a material excellent in heat resistance as shown in FIG. A configuration in which a plurality of disk members 20 are arranged in the axial direction and compressed in the axial direction is conceivable.

  In addition, when the first to third pulling rollers 13 to 15 are made of the same material, there is a correlation between the bulk density and the hardness, that is, the higher the bulk density, the higher the hardness. For this reason, the hardness (at least the surface hardness) of each of the pulling rollers 13 to 15 can be determined by grasping the bulk density of each of the pulling rollers 13 to 15 without measuring the surface hardness as in the above embodiment. It becomes possible to arrange so that it may become low.

  Specifically, in the roller group R provided below the forming unit 12, the second pulling roller 14 having a lower bulk density than the first pulling roller 13 is arranged on the downstream side of the first pulling roller 13. Established. A third pulling roller 15 having a lower bulk density than that of the second pulling roller 14 is disposed downstream of the second pulling roller 14. As a result, the downstream portion of the glass ribbon G, which is low in temperature and easily damaged, can be configured to be pulled by the second and third pulling rollers 14 and 15 having low bulk density and hence low hardness. As a result, the pulling rollers 13 to 15 can be obtained. Damage to the glass ribbon G due to contact with the glass can be suppressed.

  Further, when the first to third pulling rollers 13 to 15 are made of the same material as described above, it can be said that the higher the hardness (bulk density), the more advantageous in terms of wear resistance. Moreover, for the reason that the temperature of the glass ribbon G is higher on the upstream side, the pulling rollers 13 to 15 tend to be more easily worn on the upstream side. That is, by setting the hardness (bulk density) higher for the upstream pulling rollers 13 to 15, the configuration is also preferable in terms of suppressing wear.

When the pulling rollers 13 to 15 are made of the same material, the bulk density of the pulling rollers 13 to 15 is D _n (where n = 1, 2, 3 in order from the top pulling roller), and D _n ≧ D It is preferable that the traction rollers 13 to 15 are arranged so as to satisfy _{n + 1} and the bulk density D _{1 of the} uppermost first pulling roller 13> the bulk density D ₃ of the lowermost third pulling roller 15. In other words, the bulk densities D ₂ and D _{3 of} the second and third pulling rollers 14 and 15 are the same as the bulk densities D ₁ and D ₂ of the first and second pulling rollers 13 and 14 in the previous stage, respectively. without exceeding, also, it is preferable to provide as bulk density D ₃ of the third traction roller 15 of the bottom is lower than the bulk density D ₁ of the first pull roll 13 at the uppermost stage. This makes it possible to set the hardness of each pulling roller 13 to 15 according to the viscosity (hardness) of the glass ribbon G that gradually increases as it is pulled downward by each pulling roller 13 to 15. Further, damage to the glass ribbon G due to contact with the pulling rollers 13 to 15 can be suppressed.

  When the pulling rollers 13 to 15 are made of the same material, the pulling rollers 13 to 15 are configured as shown in FIG. 3, that is, a configuration in which a plurality of disk members 20 are compressed in the axial direction. It is preferable that In this configuration, the bulk density increases as the degree of compression of each disk member 20 in the axial direction increases. In other words, the bulk density of each of the pulling rollers 13 to 15 can be adjusted by adjusting the degree of axial compression applied to the plurality of disk members 20 when the pulling rollers 13 to 15 are formed. The bulk density of 15 and thus the hardness can be easily adjusted.

  In the above-described embodiment, the configuration of the pulling roller that pulls the glass ribbon G that is flow-down formed from the forming unit 12 is a three-stage configuration including the first to third pulling rollers 13 to 15, but is not particularly limited thereto. It is good also as a structure of 2 steps | paragraphs or 4 steps | paragraphs or more.

  In the above-described embodiment, an example in which each first pulling roller 13 is integrally rotated by one rotating shaft 16 on each of the front surface side and the back surface side is shown. However, for example, each first pulling roller 13 is individually The rotating shaft may be rotated in a so-called cantilever state. The second and third pulling rollers 14 and 15 can be similarly changed.

  In the glass article manufacturing apparatus 11 of the above embodiment, a cooling roller or the like for forming or cooling the glass ribbon G may be provided upstream of the first pulling roller 13 in the flow direction Z.

  In the above embodiment, the glass article manufacturing apparatus 11 includes the forming unit 12 that forms the glass ribbon G by using the overflow downdraw method, but is not limited to the overflow downdraw method. It is also possible to change to a molding part for forming glass by flow method or redraw method.

-You may combine said embodiment and each modification suitably.
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) In a glass article manufacturing apparatus that pulls a glass ribbon that is formed from a forming portion by a plurality of pulling rollers,
The hardness of the plurality of (m) pulling rollers is H _n (where n = 1, 2,..., M in order from the uppermost pulling roller),
H _n ≧ H _{n + 1} and the hardness of the uppermost pulling roller H ₁ > the hardness of the lowermost pulling roller H _m
Each said pulling roller is arrange | positioned so that it may satisfy | fill, The manufacturing apparatus of the glass article characterized by the above-mentioned.

According to this arrangement, without hardness any traction roller exceeds the hardness of the traction rollers of the previous stage, also, the hardness H _m of the lowermost traction roller is lower than the hardness H ₁ of the uppermost pulling roller Each pulling roller is arranged so as to be. As a result, it becomes possible to set the hardness of each pulling roller according to the viscosity (hardness) of the glass ribbon that gradually increases as it is pulled downward by each pulling roller. Damage to the glass ribbon can be suppressed.

(B) In a glass article manufacturing apparatus that pulls a glass ribbon that is formed from a forming portion by a plurality of pulling rollers,
Each pulling roller is composed of the same material as each other,
The bulk density of the plurality of (m) pulling rollers is D _n (where n = 1, 2,..., M in order from the uppermost pulling roller),
D _n ≧ D _{n + 1} and the bulk density of the uppermost pulling roller D ₁ > the bulk density of the lowermost pulling roller D _m
Each said pulling roller is arrange | positioned so that it may satisfy | fill, The manufacturing apparatus of the glass article characterized by the above-mentioned.

According to this configuration, the bulk density of an arbitrary pulling roller does not exceed the bulk density of the preceding pulling roller, and the bulk density _Dm of the lowermost pulling roller is equal to the bulk density D of the uppermost pulling roller. Each pulling roller is disposed so as to be lower than ₁ . And since the material of each pulling roller is the same, the higher the bulk density, the higher the hardness. Therefore, each of the pulling rollers according to the viscosity (hardness) of the glass ribbon that gradually increases as it is pulled downward. The hardness of the pulling roller can be set, and as a result, damage to the glass ribbon due to contact with the pulling roller can be suppressed.

  DESCRIPTION OF SYMBOLS 11 ... Glass ribbon manufacturing apparatus (glass article manufacturing apparatus), 12 ... Molding part, 13 ... 1st pulling roller, 14 ... 2nd pulling roller, 15 ... 3rd pulling roller, 20 ... Disk member, G ... Glass ribbon, SP: Strain point position.

Claims (5)

In a glass article manufacturing apparatus that pulls a glass ribbon that is formed from a forming section by a plurality of pulling rollers,
The plurality of pulling rollers are:
An upstream pulling roller;
An apparatus for manufacturing a glass article, comprising: a downstream pulling roller disposed downstream of the upstream pulling roller and having a lower hardness than the upstream pulling roller.   2. The upstream pulling roller and the downstream pulling roller are respectively disposed above and below a position at which the temperature of the glass ribbon formed by flow-down molding from the forming portion becomes a strain point. Glass article manufacturing equipment. In a glass article manufacturing apparatus that pulls a glass ribbon that is formed from a forming section by a plurality of pulling rollers,
The plurality of pulling rollers are:
An upstream pulling roller;
A downstream pulling roller disposed downstream of the upstream pulling roller,
The apparatus for producing a glass article, wherein the downstream pulling roller is made of the same material as the upstream pulling roller, and has a lower bulk density than the upstream pulling roller.   The said upstream pulling roller and the said downstream pulling roller are each arrange | positioned above and below the position where the temperature of the said glass ribbon flow-down-formed from the said shaping | molding part becomes a strain point, respectively. Glass article manufacturing equipment.   The glass article according to claim 3 or 4, wherein the upstream pulling roller and the downstream pulling roller are formed by compressing a plurality of disk members stacked in the axial direction in the axial direction. apparatus.