TW202244019A - Glass substrate manufacruting device and tube member - Google Patents

Abstract

The present invention provides a glass substrate manufacturing device capable of suppressing local stress concentration in a corrugated portion having radial unevenness formed in a tubular member. The glass substrate manufacturing device includes: a tubular member made of a material containing a platinum group metal and having a peripheral wall extending in the axial direction. A part of the wall portion in the axial direction includes: at least one corrugated portion having radial unevenness of the wall portion formed alternately in the axial direction and continuous in the circumferential direction. Among the corrugated portions, the convex portion that is convex in the radial direction has a first convex portion having the highest convex height and a pair of second convex portions arranged on both sides in the axial direction relative to the first convex portion and having a convex height lower than that of the first convex portion. The concave portion that is concave in the radial direction of the corrugated portion has a pair of first concave portions positioned between the first convex portion and the second convex portion. In a cross-section of the wall of the plane extending axially and radially, the length of each first concave portion is greater than the length of the first convex portion.

Description

Glass substrate manufacturing device and pipe member

The present invention relates to a pipe member for processing molten glass, and a glass substrate manufacturing apparatus provided with the pipe member.

Glass substrates used in displays such as liquid crystal displays and organic EL (Electroluminescent: Electroluminescent) displays are processed by transferring, clarifying, and homogenizing the molten glass produced by melting glass raw materials, and then forming it into a plate shape. manufacture.

For handling molten glass, pipe members are used. The pipe member has a circumferential wall portion extending in the axial direction, and processes molten glass while flowing it. As such a tube member, for example, in a clarification tube for clarification of molten glass, an electric current is flowed between a pair of electrodes provided at a wall at intervals, and the clarification tube is heated, whereby the molten glass is set. A temperature suitable for clarification. When heating such a clarification tube, in order to prevent the temperature of the electrode from becoming too high, the electrode is formed in the shape of a flange extending protrudingly from the outer peripheral side, so that heat can be dissipated. Moreover, in order to discharge gas, such as oxygen released from molten glass during clarification, to the outside, the clarification pipe may be provided with the vent pipe which protrudes from the outer peripheral side.

On the other hand, supports such as refractory bricks are arranged around the pipe member so as to surround the wall portion of the pipe member. Members, such as the said flange provided in the clarification pipe, and a ventilation pipe, are arrange|positioned so that it may extend between refractory bricks. Therefore, when the clarification pipe is heated up for operation, the flange or vent pipe is bound by refractory bricks, thus restricting the axial expansion of the clarification pipe, generating internal stress, and the stress is easy to concentrate on the flange or vent pipe and the clarification pipe the connection part. As a result, when a stress higher than the fracture stress is applied, there is a problem that cracks are generated in the above-mentioned connecting portion, and the molten glass leaks from the portion to the outside. Also, even if the stress does not reach the fracture stress, there is a risk that the fatigue of the clarifier tube will be increased and the life of the clarifier tube may be shortened.

Previously, it was known that a pipe member for transferring molten glass may be buckled due to axial compressive stress due to heat. Therefore, at least one convex portion continuous in the circumferential direction is provided in the axial direction in the conduit for molten glass (Patent Document 1). In addition, it is known that corrugation is applied to the thin plate of the structure in order to compensate for the low shape rigidity of the thin plate structure exposed to high operating temperature (Patent Document 2). [Prior Art Literature] [Patent Document]

[Patent Document 1] International Publication No. 2004/070251 [Patent Document 2] Japanese Patent Laid-Open No. 2002-205123

[Problem to be solved by the invention]

In the pipe members described in Patent Documents 1 and 2, it is known that when thermal expansion of the pipe member is restricted and internal stress is generated in the pipe member, the stress generated at the above-mentioned convex portion or corrugated portion tends to concentrate on the convex portion or corrugated portion. A part of a part of an area. Such localized stress concentration increases the risk of partial breakage of the above-mentioned convex portion or wave, and increases the risk of molten glass leaking from there to the outside.

Therefore, an object of the present invention is to provide a glass substrate manufacturing apparatus capable of suppressing local stress concentration formed in a corrugated portion having radial unevenness of a pipe member. [Technical means to solve the problem]

One aspect of the present invention is a glass substrate manufacturing apparatus. A glass substrate manufacturing apparatus characterized by comprising: a pipe member made of a material containing a platinum group metal and having a circumferential wall portion extending in the axial direction; and A partial area of the above-mentioned wall portion in the above-mentioned axial direction includes: at least one wave-shaped portion, which is formed in an alternate arrangement in the above-mentioned axial direction and continuous in the circumferential direction, and has radial concavities and convexities of the above-mentioned wall portion; The protruding portion protruding in the radial direction of the wave-shaped portion has a first protruding portion with the highest protruding height, and is arranged on both sides of the axial direction relative to the first protruding portion, and the protruding height is higher than that of the first protruding portion. One of the lower convex parts is the second convex part; The radially recessed concave portion of the corrugated portion has a pair of first concave portions located between the first convex portion and the second convex portion; In a cross section of the wall along a plane extending in the axial direction and the radial direction, the length of each of the first recesses is longer than the length of the first protrusions.

Preferably, each of the above-mentioned convex portion and the above-mentioned concave portion has a curved portion that is curved so as to have a radius of curvature in the above-mentioned cross section.

Preferably, in the cross section, the length of the curved portion of the first concave portion is longer than the length of the curved portion of the first convex portion.

Preferably, when the above-mentioned curved portion is referred to as a first curved portion, the above-mentioned first concave portion has in the above-mentioned section: a flat portion extending linearly in a direction parallel to the aforementioned axial direction; and a second curved portion located between the first curved portion and the flat portion; and In the above cross section, the total length of the curved portion and the flat portion is longer than the length of the curved portion of the first convex portion.

Preferably, the radius of curvature R1 of the curved portion of the first convex portion is equal to or smaller than the radius of curvature R2 of the curved portion of the first concave portion.

Preferably, the radius of curvature R1 of the curved portion of the first convex portion is equal to or smaller than the radius of curvature R3 of the curved portion of the second convex portion.

Preferably, the protrusion height H2 of the second protrusion is 1.2 to 1.6 times the protrusion height H1 of the first protrusion.

The above-mentioned pipe member is suitable for the following situations: Molten glass is processed on the inner side of the above-mentioned wall, and further possesses: at least one protruding member connected to the wall portion so as to extend from the wall portion toward the outer peripheral side, and function during the above-mentioned treatment; and The supporting body supports the wall portion and is disposed around the pipe member so as to sandwich the protruding member from both sides in the axial direction.

Preferably, there are a plurality of the above-mentioned protruding members; and The axial distance between the corrugated portion and the protruding member closest to the corrugated portion is less than 10% of the distance between the two adjacent protruding members.

Preferably, the wall portion includes a plurality of the wave-shaped portions formed in different regions in the axial direction.

Preferably, the above-mentioned pipe member is formed by connecting a plurality of unit pipes divided in the axial direction; Preferably, one of the above-mentioned protruding members, or one or two of the above-mentioned corrugated portions are formed on each of the above-mentioned unit tubes.

Preferably, the axial length of the wave-shaped portion is 20% or more of the axial length of the unit pipe relative to the unit tube in which the wave-shaped portion is formed.

Another aspect of the present invention is a pipe member, which is characterized in that it is composed of a material containing a platinum group metal and has a circumferential wall portion extending in the axial direction; The above-mentioned wall part includes in a part of the above-mentioned axial direction: at least one wave-shaped part, which is formed in a manner of being alternately arranged in the above-mentioned axial direction and continuous in the circumferential direction, and has radial concavities and convexities of the above-mentioned wall part; The radially protruding protruding portion of the wave-shaped portion has: a first protruding portion with the highest protruding height; and a pair of second protruding portions, which are arranged on both sides of the axial direction relative to the above-mentioned first protruding portion , and the height of the protrusion is lower than that of the first protrusion; The radially recessed concave portion of the corrugated portion has a pair of first concave portions located between the first convex portion and the second convex portion; In a cross section of the wall along a plane extending in the axial direction and the radial direction, the length of each of the first recesses is longer than the length of the first protrusions. [Effect of Invention]

According to the glass substrate manufacturing apparatus and pipe member of the above aspect, local stress concentration formed in the corrugated portion having radial concavities and convexities of the pipe member can be suppressed.

Hereinafter, the glass substrate manufacturing apparatus of this embodiment is demonstrated.

(Whole outline of glass substrate manufacturing apparatus) FIG. 1 is a schematic diagram of the glass substrate manufacturing apparatus of this embodiment. As shown in FIG. 1 , the glass substrate manufacturing apparatus mainly includes a melting apparatus 100 , a forming apparatus 200 , and a cutting apparatus 300 . The melting device 100 has a melting tank 101 , a clarification pipe 102 , a stirring tank 103 , transfer pipes 104 and 105 , and a glass supply pipe 106 . In the melting tank 101 shown in FIG. 1 , heating means such as burners not shown are provided. The glass raw material added with the clarifying agent is put into the melting tank 101, and the melting step of making molten glass is carried out. The molten glass to be melted in the melting tank 101 is supplied to the clarification pipe 102 through the transfer pipe 104 . In the clarification pipe 102, while flowing the molten glass MG, the temperature of the molten glass MG is adjusted, and clarification of the molten glass is performed by oxidation-reduction reaction of a clarifier (clarification process). Specifically, by raising the temperature of the molten glass in the clarification pipe 102, bubbles containing oxygen, CO ₂ , or SO ₂ contained in the molten glass absorb oxygen generated by the reduction reaction of the clarifier to grow, and float on the molten glass. The liquid surface is released to the vapor phase space. Thereafter, by lowering the temperature of the molten glass, oxidation reaction is carried out by reducing substances produced by the reduction reaction of the clarifying agent. Thereby, gas components such as oxygen remaining in the bubbles of the molten glass are reabsorbed in the molten glass, and the bubbles disappear. The clarified molten glass is supplied to the stirring tank 103 through the transfer pipe 105 . In the stirring tank 103, a homogenization process is performed by stirring molten glass with the stirrer 103a. The molten glass homogenized in the stirring tank 103 is supplied to the molding device 200 through the glass supply pipe 106 . In the forming apparatus 200, the glass sheet SG is formed from molten glass by, for example, an overflow downdraw method, and slowly cooled. In the cutting apparatus 300, the plate-shaped glass substrate cut out from the glass sheet SG is formed.

In this embodiment, at least one of the clarification pipe 102, the transfer pipes 104, 105, and the glass supply pipe 106 among the above-mentioned structural requirements of the glass substrate manufacturing apparatus is a pipe member described later. The pipe member is processed by molten glass. The clarification pipe 102 clarifies while flowing molten glass as mentioned above. The transfer pipes 104 and 105 and the glass supply pipe 106 transfer molten glass. Hereinafter, it demonstrates taking the clarification pipe 102 as an example as a pipe member.

(clarification tube) FIG. 2 is a schematic diagram showing the composition of the clarification pipe 102 . The clarification pipe 102 is a tubular member made of a material containing a platinum group metal. The so-called platinum group metals refer to six elements of platinum (Pt), palladium (Pd), rhodium (Rh), ruthenium (Ru), osmium (Os), and iridium (Ir). Examples of materials containing platinum group metals include materials containing a single metal or an alloy of two or more metals among platinum group metals. For example, platinum or a platinum alloy is used.

The clarification pipe 102 is a member made of a platinum group metal, and has a circumferential (cylindrical) wall portion 102 a extending in the axial direction of the clarification pipe 102 . Molten glass is supplied to the clarification pipe 102 so that a vapor phase space may be formed above the liquid surface of molten glass. The molten glass is refined inside the wall portion 102a. The clarification pipe 102 has a circular outer periphery in a cross section perpendicular to the axial direction. The axial direction of the clarification pipe 102 means the direction parallel to the central axis of the clarification pipe 102 passing through the center of the clarification pipe 102 (the center of the circle shape) in this section (the left-right direction in the figure).

At least one protruding member is provided in the clarification pipe 102 . The protruding member is a member that is connected to the wall portion 102a so as to extend from the wall portion 102a toward the outer peripheral side, and functions during clarification. As such a protruding member, a pair of flanges 102b, 102c and vent pipe 102d are provided in the clarification pipe 102 as shown in FIG. 2 .

Flanges 102b and 102c are disk-shaped members provided at both ends in the axial direction of clarification pipe 102 . The flanges 102b, 102c are connected to the wall 102a by welding. The flanges 102b, 102c are connected to a power supply device not shown in the figure, and a voltage is applied between the flanges 102b, 102c by the power supply device 20, so that a current flows in a part of the wall portion 102a between the flanges 102b, 102c, Instead, the clarification pipe 102 is heated. In this way, the flanges 102b and 102c function as a pair of electrodes. By this energization heating, the clarification pipe 102 is heated to, for example, about 1650°C to 1700°C, and the molten glass MG supplied from the transfer pipe 104 is heated to a temperature suitable for defoaming, for example, about 1600°C to 1700°C.

On the other hand, in the flanges 102b, 102c, cooling pipes (not shown) through which the refrigerant flows are provided along the periphery of the flanges, and the flanges 102b, 102c are cooled by supplying the refrigerant into the cooling pipes. And cool the flanges 102b, 102c which generate heat by heating with electricity.

The ventilation pipe 102d is a pipe which communicates the vapor phase space and the outer space of the clarification pipe 102 . The vent pipe 102d is connected to the wall portion 102a by welding. The ventilation pipe 102d has a function of discharging gases such as oxygen, CO ₂ , and SO ₂ released from the molten glass MG into the vapor phase space to the external space.

The glass substrate manufacturing apparatus further includes a support body 110 . The support body 110 is a structure which supports the wall part 102a of the clarification pipe 102. As shown in FIG. The support body 110 is made of a refractory brick. The refractory bricks are arranged around the clarification pipe 102 so that the flanges 102b, 102c or the ventilation pipe 102d extend between the refractory bricks. Therefore, the flanges 102b, 102c and the ventilation pipe 102d are sandwiched by refractory bricks from both sides in the axial direction.

(wave shape part) FIG. 3 is a partial cross-sectional view showing an example of the corrugated portion of the clarification pipe 102. As shown in FIG. The dotted line in Fig. 3 shows a portion corresponding to the second convex portion of the previous wave-shaped portion. Except for this portion, the conventional corrugated portion has the same configuration as the corrugated portion of the present embodiment. The wall portion 102a of the clarification pipe 102 includes at least one wave-shaped portion 10 in a partial region in the axial direction (in FIG. 2 , an example of a region surrounded by a dotted line). The corrugated portion 10 is formed so as to be alternately arranged in the axial direction and continuously extend in the circumferential direction (one circle around the circumferential direction), and has radial concavo-convex portions of the wall portion 102a.

The corrugated part 10 has the form described below at least before heating up to the clarification temperature (for example, at room temperature, 25° C.) for manufacturing a glass substrate (operation), but may also have the form described below during operation.

The convex portion protruding toward the radially outer peripheral side of the corrugated portion 10 has a first convex portion 11 and a pair of second convex portions 12 , 12 . The first protrusion 11 is the protrusion with the highest protrusion height. In this specification, the protrusion height refers to the height in the radial direction opposite to the flat portion (base portion) of the clarification pipe 102 extending in the direction parallel to the axial direction in the portion of the wall portion 102a other than the corrugated portion 10 . As an example of the flat portion, a portion indicated by reference numeral 102e in FIG. 6 to be referred later is mentioned. The second convex portion 12 is a convex portion arranged on both sides in the axial direction with respect to the first convex portion 11 . The protrusion height of the second protrusion 12 is lower than that of the first protrusion 11 .

The concave portion of the corrugated portion 10 that is depressed toward the radially inner peripheral side has a pair of first concave portions 13 , 13 located at two positions between the first convex portion 11 and the second convex portion 12 .

In the cross section of the wall portion 102a in the plane extending in the axial direction and radial direction of the clarification pipe 102 (hereinafter also simply referred to as cross section), the length of each of the first concave portions 13 is longer than the length of the first convex portion 11 . In this specification, unless otherwise specified, the length in the cross-section of each part of the corrugated part means the length in the extending direction of the corrugated part in the cross-section, specifically, the length of the wall shown in the cross-section. The shape of the part (outline of the clarification tube) and the length. The length of at least a part of the length includes, for example, the arc length of a curved portion described later, or the length in a direction parallel to the axial direction of a flat portion described later.

When the clarification pipe 102 is heated (heated) for operation, as shown in FIG. The thermal expansion is limited, and internal stress is generated in the clarification tube 102. At this time, the stress is easy to concentrate on the flange, the vent pipe, and the connecting part with the clarification pipe, and strain is easy to occur. In this embodiment, since the wall portion 102a of the clarification pipe 102 is formed with the corrugated portions 10 that are alternately arranged in the axial direction and continuously formed in the circumferential direction, it is possible by making the clarification pipe 102 Part of the generated internal stress is generated and absorbed in the corrugated portion 10, thereby reducing the stress generated in other parts of the clarification pipe 102, and suppressing stress concentration on the above-mentioned connecting portion and the like. On the other hand, the stress generated in the corrugated part tends to concentrate on a part of the corrugated part, and depending on the magnitude of the stress, the risk of breaking the corrugated part increases, and the risk of molten glass leaking to the outside increases.

According to the research of the inventors of the present invention, in the corrugated portion 10, (1) The length of the first concave portion 13 is longer than the length of the first convex portion 11; (2) The protrusion height of the first protrusion 11 is higher than the protrusion height of the second protrusion 12; In this case, the stress absorbed by the corrugated portion 10 is easily dispersed and generated in the corrugated portion 10 , and local stress concentration in the corrugated portion 10 can be suppressed.

Specifically, the following contents were confirmed. If the corrugated portion 10 has the form of (1) above, the regions where strain easily occurs in the corrugated portion 10 will increase, and the stress generated in the corrugated portion 10 will be easily dispersed. As a result, the magnitude of the maximum stress generated in the corrugated portion 10 can be reduced, and the risk of breakage of the corrugated portion 10 can be reduced. If the corrugated part 10 has the form of (2) above, it is easy to transmit force from the second convex part 12 to the first concave part 13, and the effect of dispersing the stress generated in the corrugated part 10 by the first concave part 13 is increased.

In this embodiment, the first convex portion 11, the first concave portion 13, and the second convex portion 12 are connected to each other. The connecting position (boundary) between the convex portion and the concave portion is specified such that when the corrugated portion 10 is pushed from the concave portion to the convex portion in the cross section of the wall portion 102a, the center of the radius of curvature of the corrugated portion 10 moves from the inside of the clarification pipe 102. The position to the outside, or the center position of both ends of the portion (flat portion of straight line shape) where the radius of curvature of the wave-shaped portion 10 cannot be specified.

The length of the first concave portion 13 is preferably 150 to 250% of the length of the first convex portion 11 .

Each of the first convex portion 11, the second convex portion 12, and the first concave portion 13, in the cross section of the wall portion 102a, is at a point where the effect of dispersing stress in the corrugated portion 10 (stress dispersion effect) is large. Above, a curved portion having a curved shape is preferable, but on the other hand, a flat portion having a linear shape is also preferable from the viewpoint of securing the length of the first concave portion 13 . Each of the 1st convex part 11, the 2nd convex part 12, and the 1st concave part 13 may have both of a curved part and a flat part. Each of the 1st convex part 11, the 2nd convex part 12, and the 1st concave part 13 may respectively have a some curved part and a flat part. When there are a plurality of bent parts, the curved shapes of these bent parts may be the same or different.

The protrusion height H2 of the second protrusion 12 is preferably 1.2 to 1.6 times the protrusion height H1 of the first protrusion 11 .

According to one embodiment, it is preferable to have the curved portions 11a, 12a, and 13a curved so as to have the radii of curvature R1, R3, and R2 in the cross section of the wall portion 102a. With such a form, the stress dispersion effect becomes large. In particular, since the first concave portion 13 is provided with the curved portion 13a, this effect can be effectively enhanced.

The radius of curvature R1 of the curved portion 11a can be specified, for example, in the section of the wall portion 102a, with the midpoint between the two ends of the curved portion 11a as the center, setting a specific ratio (for example, 25%) of the length of the curved portion 11a The radius of curvature of an imaginary circle with the radius of the length of the imaginary circle and the two intersection points of the imaginary circle and the curved portion 11a, and the three points of the above-mentioned midpoint of the curved portion 11a. The radii of curvature R2 and R3 can also be specified in the same manner.

Instead, the radius of curvature R1 of the curved portion 11a may be specified as, in the section of the wall portion 102a, at a specific position between the two ends of the curved portion 11a (for example, 70% of the height of the protrusion of the first convex portion from the base). % height position) as the center, set an imaginary circle with a radius of a specific length (for example, 4 mm), and pass through the two intersection points of the imaginary circle and the curved portion 11a, and the circle of three points of the above-mentioned midpoint of the curved portion 11a The radius of curvature of the arc. In this case, regarding the radius of curvature R2, the center of the imaginary circle can be specified as, for example, the height position of 60% of the protrusion height of the first convex portion from the base in the same way, and the radius of curvature R3 can be specified as, for example, in the same way. The height position of 90% of the protrusion height of the second protrusion from the base.

When the first concave portion 13 is formed by a curved portion 11a, the length (valley width) in a direction parallel to the axial direction of the first concave portion 13 is preferably the circumference of a circle with the radius of curvature R2 of the curved portion 13a as the radius 2π・0.35~0.6 times the length of R2.

In the section of the wall portion 102a, the length of the curved portion 13a of the first concave portion 13 is preferably longer than the length of the curved portion 11a of the first convex portion 11 as shown in FIG. 3 . Thereby, the stress dispersion effect can be effectively increased. In the example shown in FIG. 3, the curved portion 13a is longer than the curved portion 11a by the amount of the additional arc portion 13a1. This form is effective when restricting the width (the length in the direction parallel to the axial direction of the clarification pipe 102 ) of the portion forming the wall portion 102 a of the corrugated portion 10 .

FIG. 4 is a partial cross-sectional view showing another example of the corrugated portion 10. As shown in FIG. The dotted line in Fig. 4 shows an example of the previous corrugated portion. When the curved portion 13a of the first concave portion 13 is referred to as the first curved portion 13a, according to one embodiment, the first concave portion 13, as shown in FIG. In addition to the portion 13a, it further has a flat portion 13b and a second curved portion 13c. The flat portion 13b is a portion linearly extending in a direction parallel to the axial direction of the clarification pipe 102 . The second curved portion 13c is a portion located between the first curved portion 13a and the flat portion 13b.

The length D2 in the direction parallel to the axial direction of the flat portion 13b is preferably 20-80% of the length of the first recess 13, more preferably 25-50%. If the ratio exceeds 80%, the three protrusions 11 and 12 are independent, and the effect of stress dispersion may be greatly reduced. Moreover, if this ratio is less than 20%, it will be difficult to ensure the length of the 1st recessed part 13 fully. D2 is, for example, 2 to 6 mm.

The curvature radius R1 of the curved portion 11a of the first convex portion 11 is preferably equal to the curvature radius R2 of the curved portion 13a of the first concave portion 13, or smaller than the curvature radius R2 as shown in FIG. 3 and FIG. 4 . That is, it is preferable that R1≦R2. Thereby, the effect of stress dispersion becomes greater, and the magnitude of the maximum stress generated in the corrugated portion 10 can be reduced. Also, when there is the above-mentioned restriction on the width of the wall portion 102a, the length of the first concave portion 13 can be easily ensured by setting the curvature radius R1 of the first convex portion 11 smaller than R2.

The curvature radius R1 of the curved portion 11a of the first convex portion 11 is preferably equal to or smaller than the curvature radius R3 of the curved portion 12a of the second convex portion 12 . That is, it is preferable that R1≦R3. When there is the above-mentioned restriction on the width of the wall portion 102a, it is effective to satisfy R3≧R1 in order to secure the length of the first concave portion 13 . R1 is preferably 0.4 to 1 times the length of R3. When there is the above-mentioned restriction on the width of the wall portion 102a, it is preferable that R3 of the second convex portion 12 is also small when the first concave portion 13 has a flat portion 13b.

According to one embodiment, the protrusion height H1 of the first convex portion 11 is preferably the sum R1+R2 of the curvature radius R1 of the curved portion 11a of the first convex portion 11 and the curvature radius R2 of the curved portion 13a of the first concave portion 13 The height of 0.8 to 1.2 times of , especially preferably H1=R1+R2. If this relationship is satisfied, it is easy to adjust the size of the protrusion height H1 relative to the protrusion height H2 so that the stress dispersion effect becomes greater.

As mentioned above, when the flanges 102b, 102c and the ventilation pipe 102d are provided as the protruding members, the corrugated portion 10, and the protruding member closest to the corrugated portion 10 among the protruding members 102b, 102c, 102d The distance between 102b, 102c and 102d in the axial direction is preferably less than 10% of the distance between two adjacent protruding members 102b, 102c and 102d. The closer the corrugated part 10 is provided to the connection part where the stress generated in the clarification pipe 102 tends to concentrate, the more the stress concentration to the connection part can be suppressed, and the generation of cracks or the aggravation of fatigue in the connection part can be suppressed.

The wall portion 102a preferably includes a plurality of wave-shaped portions 10 formed in different regions in the axial direction. Since the part which absorbs the stress which arises in the clarification pipe 102 increases, the effect which reduces the stress concentration to a connection part etc. improves.

FIG. 5 is a diagram showing a plurality of unit pipes 112 constituting the clarification pipe 102 . The clarification pipe 102 is formed by linearly connecting a plurality of unit pipes 112 divided in the axial direction, as shown in FIG. 5 , for example. In this case, it is preferable to form one or two of the vent pipe 102d or the corrugated portion 10 in each of the unit pipes 112 . In FIG. 5 , the unit tube 112 on which the corrugated portion 10 is formed is omitted from the illustration of the concavo-convex. Adjacent unit tubes 112 are connected by welding. Also, when internal stress is generated in the clarification pipe 102 at the connecting portion between the unit pipes 112 , stress concentration tends to occur. In the clarification pipe 102 of this embodiment, by absorbing part of the stress generated in the clarification pipe 102 by the corrugated part 10, the stress concentration in the connection part of unit pipe 112 is also suppressed.

Fig. 6 is a partial sectional view showing another example of the corrugated portion. Regarding the unit tube 112 in which the corrugated portion 10 is formed, the axial length of the corrugated portion 10 is preferably 20% or more of the axial length of the unit tube 112 . If it is less than 20%, the stress per unit length of the corrugated portion 10 increases, and the risk of breaking the corrugated portion 10 increases. In this regard, when the flat portion 13b is referred to as the second flat portion, the total length D1 of the first flat portion 15 is preferably 80% of the axial length of the unit tube 112 as shown in FIG. 6 . %. The first flat portion 15 is a portion located on both sides of the corrugated portion 10 in addition to the corrugated portion 10 and extending in a direction parallel to the axial direction.

The axial length of the corrugated portion 10 is preferably more than 70% of the axial length of the unit tube 112 .

In the example shown in FIG. 6 , the length D1 of the first flat portion 15 is preferably 0.3 to 1.2 times the diameter 2·R3 of the second convex portion 12 .

As shown in FIG. 6 , the corrugated portion 10 preferably has inclined portions 14 located at both ends of the corrugated portion 10 and connected to the second convex portion 12 . The inclined portion 14 preferably has a curved portion 14a having a curvature radius R4. In this case, the diameter 2·R4 of the bent portion 14a is preferably 0.4 to 2 times the axial length of the connecting portion of the unit tubes 112 . Since the inclined portion 14 is the part that first transmits force to the corrugated portion 10 when internal stress is generated in the clarification pipe 102, if the curvature radius R4 of the curved portion 14a is large, the input force is easily concentrated on the inclined portion 14.

The curvature radius R3 of the second convex portion 12, the curvature radius R4 of the slope portion 14, and the protrusion height H2 of the second convex portion 12 preferably satisfy the relationship of R3+R4>n·H2. n is a real number from 1 to 3. Furthermore, it is preferred that R3 and R4 are close in size, for example, R3/R4 is 0.9˜1.1. Thereby, the above-mentioned effect of transmitting force from the second convex portion 12 to the first convex portion 11 is increased.

An example of preferable dimensions of the above-mentioned constituent elements of the corrugated portion 10 is shown. H1 is 9-15mm. R1 is 4-8mm. R2 is 5-8mm. R3, R4, and H2 are 4 to 8 mm, respectively. D1 is 15-25mm. D2 is 2-8mm. The axial length of the corrugated part 10 is 50-70 mm. The axial length of the unit tube 112 is 90-120 mm.

The unit pipe 112 or clarification pipe 102 having the corrugated portion 10 is formed by, for example, placing the pipe in a hydroforming die having a pressing surface processed to form the corrugated portion 10 on the wall portion 102a, and applying hydraulic pressure from the inside of the pipe. Expansion processing (hydroforming) for deforming the wall portion, or compression molding using a mold processed to form the wave-shaped portion 10 on the wall portion 102a, is produced by compression molding.

(experimental example) A simulation is performed to calculate the stress distribution in the corrugated part using a model in which the corrugated part is made of different unit tubes. In the simulation, the magnitude of the stress generated in the corrugated portion was analyzed when the temperature of the unit tube was raised to the clarification temperature under the condition that thermal expansion in the axial direction was not possible. Various parameters set during analysis are as follows. ·Material of unit tube: Platinum Axial length (width) of the unit tube: 120 mm ·Thickness of unit tube: 1 mm ·Heating temperature range: 30°C to 1650°C Under the above parameters, the stress distribution in the corrugated portion 10 was calculated for the following five models.

(Model 1) A unit tube 112 having the corrugated part 10 shown in FIG. 3 , that is, the corrugated part 10 satisfying the above-mentioned preferable dimension example was used. Set to D1=20mm. (Model 2) As in Model 1, a unit tube having a corrugated portion (previous example) having a portion corresponding to the first convex portion shown by a dotted line in FIG. 3 was used. (Model 3) As in Model 1, a unit tube having a corrugated portion (Comparative Example 1) in which the length of the portion corresponding to the first concave portion was equal to the length of the first convex portion was used. (Model 4) As in Model 1, a unit tube of a corrugated portion (comparative example 2) in which the protrusion height of the portion corresponding to the first convex portion was equal to the protrusion height of the second convex portion was used. (Model 5) A unit tube 112 having the corrugated part 10 shown in FIG. 4 , that is, the corrugated part 10 satisfying the above-mentioned preferable dimension example was used.

From the calculated stress distribution, compare the average stress that is the maximum value among the average stress values at each of the 7 places including the axial ends of the unit tube, the second convex part, the first concave part, and the first convex part among the models. Value (maximum stress value) to evaluate the size of the stress dispersion effect.

The comparison results show that the maximum stress value of Model 1 is smaller than that of Model 2 (previous example) as shown in Figure 7 and Figure 8, and the stress dispersion effect of Model 1 is greater than that of Model 2. Fig. 7 (a) and Fig. 8 (a) are the graphs showing the simulation results of the stress distribution in the wave shape part of model 2, Fig. 7 (b) and Fig. 8 (b) are the graphs showing the stress distribution in the wave shape part of model 1 A plot of the simulation results of the stress distribution. 7 and 8 are graphs showing the same simulation results, and FIG. 8 is a graph showing the stress distribution shown by the color scale in FIG. 7 (expressed in monochrome in the drawing) into grayscale. The bars located at the left ends of Fig. 7 and Fig. 8 display stress values step by step in the vertical direction, and the higher the stress value is, the higher the display is. The colors shown in the bars of Fig. 7 change from dark blue at the lower end to light blue, green, yellow, and red at the upper end. In Fig. 7, the stress value of the part other than the concave part in the wave-shaped part shows the color between dark blue and green in both models 1 and 2, but in the concave part, compared with the part shown in red in model 2, in the model In 1, there is no part shown in red. Also, it can be seen that the maximum stress value of model 5 is smaller than that of model 2 (previous example), and the stress dispersion effect of model 5 is greater than that of model 2.

The maximum stress values of models 1 and 5 are smaller than those of model 3 (comparative example 1), and the length of the first concave part is longer than the length of the first convex part, which shows that the effect of stress dispersion is improved. The maximum stress values of models 1 and 5 are smaller than those of model 4 (comparative example 2), and the protrusion height of the first convex part is higher than that of the second convex part, which shows that the stress dispersion effect is improved . In addition, the maximum stress values of Model 3 and Model 4 are smaller than that of Model 2.

Above, the glass substrate manufacturing apparatus and pipe member of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various improvements and changes can be made without departing from the gist of the present invention.

In the above-mentioned embodiment, the case where the convex portion of the wave-shaped portion protrudes toward the radially outer peripheral side and the concave portion is recessed toward the radially inner peripheral side has been described. A form that protrudes toward the inner peripheral side, and the concave portion is recessed toward the radially outer peripheral side. In this form, the convex part protrudes toward the inside of the clarification pipe 102 with respect to the base part of the wall part 102a, and the maximum depth position of a recessed part exists in the position of the same height as the base part of the wall part 102a, for example. It was confirmed that the stress dispersion effect is also improved by the corrugated portion 10 in such a form.

10: Wavy part 11: 1st convex part 11a: bending part 12: The second convex part 12a: bending part 13: The first recess 13a, 13c: bending part 13a1: Add arc part 13b,15: flat part 14: Inclined part 100: melting device 101: melting tank 102: clarification tube 102a: wall 102b, 102c: flange (protruding member) 102d: Breathing pipe (protruding member) 102e: flat portion (base) 103: Stirring tank 103a: Stirrer 104,105: transfer tube 106: glass supply tube 110: support body 112: unit tube 200: forming device 300: cutting device D1: length D2: Length H1: Protrusion height H2: Protrusion height MG: molten glass R1~R4: radius of curvature SG: glass sheet

Fig. 1 is a diagram showing a schematic configuration of a glass substrate manufacturing apparatus. Figure 2 is a diagram illustrating the forces acting on the clarification tube. Fig. 3 is a partial cross-sectional view showing an example of a corrugated portion. Fig. 4 is a partial sectional view showing another example of the corrugated portion. Fig. 5 is a diagram showing unit tubes constituting the clarification tube. Fig. 6 is a partial sectional view showing another example of the corrugated portion. Fig. 7(a) is a diagram showing the simulation results of the stress distribution in the corrugated part in the previous color code, and (b) is a diagram showing the simulation results of the stress distribution in the corrugated part of the present embodiment in color code. Fig. 8(a) is a diagram showing the simulation results of Fig. 7(a) in grayscale, and (b) is a diagram showing the simulation results of Fig. 7(b) in grayscale.

10: Wavy part

11: 1st convex part

11a: bending part

12: The second convex part

12a: bending part

13: The first recess

13a: bending part

13a1: Add arc part

H1: Protrusion height

H2: Protrusion height

R1~R3: radius of curvature

Claims (13)

A glass substrate manufacturing apparatus characterized by comprising: a pipe member made of a material containing a platinum group metal and having a circumferential wall portion extending in the axial direction; and A partial area of the above-mentioned wall portion in the above-mentioned axial direction includes: at least one wave-shaped portion, which is formed in an alternate arrangement in the above-mentioned axial direction and continuous in the circumferential direction, and has radial concavities and convexities of the above-mentioned wall portion; The protruding portion protruding radially in the wave-shaped portion has a first protruding portion with the highest protruding height, and a pair of second protruding portions disposed on both sides of the axial direction relative to the first protruding portion; The radially recessed concave portion of the corrugated portion has a pair of first concave portions located between the first convex portion and the second convex portion; In a cross section of the wall along a plane extending in the axial direction and the radial direction, the length of each of the first recesses is longer than the length of the first protrusions. The glass substrate manufacturing apparatus according to claim 1, wherein each of the above-mentioned convex portion and the above-mentioned concave portion has a curved portion curved so as to have a radius of curvature in the above-mentioned section. The glass substrate manufacturing apparatus according to claim 2, wherein in the cross section, the length of the curved portion of the first concave portion is longer than the length of the curved portion of the first convex portion. The glass substrate manufacturing apparatus according to claim 2 or 3, wherein when the curved portion is referred to as the first curved portion, the first concave portion has in the cross-section: a flat portion extending linearly in a direction parallel to the aforementioned axial direction; and a second curved portion located between the first curved portion and the flat portion; and In the above cross section, the total length of the curved portion and the flat portion is longer than the length of the curved portion of the first convex portion. The glass substrate manufacturing apparatus according to any one of claims 2 to 4, wherein the curvature radius R1 of the above-mentioned curved portion of the above-mentioned first convex portion is equal to or smaller than the curvature radius R2 of the above-mentioned curved portion of the above-mentioned first concave portion R2. The glass substrate manufacturing apparatus according to any one of claims 2 to 5, wherein the radius of curvature R1 of the curved portion of the first convex portion is equal to or smaller than the radius of curvature R3 of the curved portion of the second convex portion Radius R3. The glass substrate manufacturing apparatus according to any one of claims 1 to 6, wherein the protrusion height H2 of the second protrusion is 1.2 to 1.6 times the protrusion height H1 of the first protrusion. The glass substrate manufacturing apparatus according to any one of claims 1 to 7, wherein the pipe member processes molten glass inside the wall, and further comprises: at least one protruding member connected to the wall portion so as to extend from the wall portion toward the outer peripheral side, and function during the above-mentioned treatment; and The supporting body supports the wall portion and is disposed around the pipe member so as to sandwich the protruding member from both sides in the axial direction. The glass substrate manufacturing apparatus as claimed in claim 8, wherein there are a plurality of the above-mentioned protruding members; The axial distance between the above-mentioned corrugated part and the projecting member closest to the corrugated part among the above-mentioned protruding members is less than 10% of the distance between the two adjacent protruding members. The glass substrate manufacturing apparatus according to any one of claims 1 to 9, wherein the wall portion includes a plurality of the wave-shaped portions formed in different regions in the axial direction. The glass substrate manufacturing device according to claim 8 or 9, wherein the pipe member is formed by connecting a plurality of unit pipes divided in the axial direction; One of the above-mentioned protruding members, or one or two of the above-mentioned corrugated parts are formed on each of the above-mentioned unit tubes. The glass substrate manufacturing apparatus according to claim 11, wherein, with respect to the unit tube having the wave-shaped portion formed in the unit tube, the axial length of the wave-shaped portion is 20% of the axial length of the unit tube above. A pipe member, characterized in that it is composed of a material containing a platinum group metal and has a circumferential wall portion extending in the axial direction; A partial area of the above-mentioned wall portion in the above-mentioned axial direction includes: at least one wave-shaped portion, which is formed in an alternate arrangement in the above-mentioned axial direction and continuous in the circumferential direction, and has radial concavities and convexities of the above-mentioned wall portion; The radially protruding protruding portion of the wave-shaped portion has: a first protruding portion with the highest protruding height; and a pair of second protruding portions, which are arranged on both sides of the axial direction relative to the above-mentioned first protruding portion , and the height of the protrusion is lower than that of the first protrusion; The radially recessed concave portion of the corrugated portion has a pair of first concave portions located between the first convex portion and the second convex portion; In a cross section of the wall along a plane extending in the axial direction and the radial direction, the length of each of the first recesses is longer than the length of the first protrusions.

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