JP4158202B2 - Glass for sealing, method for producing the same, and method for sealing metal vacuum double container - Google Patents

Description

  The present invention relates to a sealing glass, for example, a solid sealing glass used in a vacuum sealing process of a metal vacuum double container, a manufacturing method thereof, and a metal vacuum using the sealing glass. The present invention relates to a method for sealing a double container.

  For example, a metal vacuum double container 10 as shown in FIG. 10 is used as a heat insulating container such as a thermos, a pot, or a jar. The metal vacuum double container 10 shown in FIG. 1 comprises a double container formed by joining an outer container 11 and an inner container 12 made of a metal material such as stainless steel to each other on the opening 14 side. The hollow part 13 between 11 and the inner container 12 is evacuated.

  As one of the methods for manufacturing the metal vacuum double container 10 as described above, one of the outer container 11 and the inner container 12 is recessed at the hollow part 13 side in one predetermined portion, for example, the bottom part 15 of the outer container 11. A recess is provided, and an exhaust port for communicating the hollow portion 13 and the outside of the container is provided in a part of the recess, and after the hollow portion 13 is evacuated through the exhaust port, the exhaust port is sealed with a low melting point. There has been proposed a method of sealing with a glass for use (see, for example, Patent Documents 1 to 4).

  In the above vacuum sealing step, the double container is held in an inverted posture so that the opening 14 is on the lower side and the bottom 15 is on the upper side, and is provided on the bottom 15 of the outer container 11 as shown in FIG. A solid sealing glass 17 is placed in the recessed portion 16. Then, the double container in which the sealing glass 17 is placed in the concave portion 16 of the bottom portion 15 is transferred to a vacuum exhaust chamber (for example, a vacuum heating furnace), and the exhaust of the hollow portion 13 is exhausted through the exhaust port 18 in the vacuum exhaust chamber. Then, the temperature is raised to a sealing temperature (for example, a temperature about 100 ° C. higher than the softening point of the sealing glass). By this temperature increase, the sealing glass 17 placed in the recess 16 is softened and flown and filled in the exhaust port 18. Thereafter, the double container is transferred to the cooling chamber and cooled. As a result, the softened and fluidized sealing glass 17 is solidified and the exhaust port 18 is sealed. In addition, such a vacuum sealing process is performed in a vacuum environment of 0.1 Torr or less.

  Patent Documents 1, 3, and 4 describe a cylindrical sealing glass used in the vacuum sealing process as described above, such as a columnar shape (rod shape), a disk shape, and a truncated cone shape. Yes. However, these shapes of sealing glass are manufactured by drawing the molten glass into a rod shape and then cutting it to an appropriate length, or after preparing a block of glass, and then having an appropriate shape and size. Since it cuts out and manufactures, there exists a problem that manufacture takes time. In addition, these sealing glasses have a machined surface formed by machining such as cutting and cutting, and the edge of the machined surface becomes a right-angled or acute-angled edge portion. In addition, the sealing glass or the sealing glass and another member may come into contact with each other and rub against each other, and cracks or chipping may occur in the edge portion. And the glass for sealing does not have a volume required for sealing by the crack and notch | chip of the said edge part, and there exists a possibility that reliable sealing cannot be performed.

Patent Documents 2 and 3 describe the use of a spherical glass as the sealing glass. As described in paragraph 0007 of Patent Document 2, such a spherical sealing glass can be produced by dripping molten glass and solidifying it during free fall. On the other hand, since cylindrical sealing glass, especially spherical sealing glass, has the property of being easy to roll in shape, sealing is performed when the double container is moved in a process with the sealing glass placed in the recess. There is a possibility that the working glass rolls due to vibration or the like and falls off from the recess. Therefore, Patent Documents 3 and 4 propose disposing a drop-off prevention member that covers the recess in order to prevent the sealing glass from falling off from the recess. However, the provision of the drop-off prevention member not only increases the number of parts of the metal vacuum double container, but also complicates the operation of housing the sealing glass in the recess.
JP-A-6-169850 JP 2002-345655 A JP 2000-166777 A JP-A-8-24147

  An object of the present invention is to provide a glass for sealing that has good posture stability with respect to rolling and is less likely to crack or chip.

  Another object of the present invention is to provide a method for sealing a metal vacuum double container that has a small number of parts, is easy to work, and can be reliably sealed.

  In order to achieve the above object, the present invention, when placed in a predetermined posture on a horizontal plane, all cross sections that pass through the center of gravity and are orthogonal to the horizontal plane are parallel to the horizontal plane, A sealing glass having a flat shape having a minor axis in a direction perpendicular to the horizontal plane and having no right or acute edge on the outer surface, the outer surface being caused by the surface tension of the molten glass There is provided a sealing glass composed of a formed free surface and a non-free surface formed by contacting molten glass with a mold. Here, the “predetermined posture” includes a single case and a plurality of cases. That is, when the above-mentioned conditions are satisfied only when placed on a horizontal plane in a certain specific posture, and when the above-mentioned conditions are set for each posture when placed on the horizontal plane in each of a plurality of postures. You may be satisfied. Further, “does not have a right-angle or acute-angle edge on the outer surface” means that a right-angle or acute-angle edge does not appear in the contours of all cross sections in an arbitrary direction.

  Since the sealing glass of the present invention has a flat shape in the minor axis direction, when placed on the sealing portion of the object to be sealed, the sealing glass is stable in the predetermined posture on the sealing portion. Even when an external force such as vibration is applied or a slight inclination is generated on the object to be sealed, it does not roll off from the sealed portion.

  Moreover, since the glass for sealing of this invention does not have a right-angled or acute-angle edge part on an outer surface, the glass for sealing or the glass for sealing and another member contact at the time of conveyance etc. Even if they are rubbed together, cracks and chips are unlikely to occur.

  In the said structure, since a free surface is formed with the surface tension of a molten glass, it becomes a smooth three-dimensional curved surface. Further, since the non-free surface is formed when the molten glass comes into contact with the mold, the shape and surface properties of the mold are transferred.

  The glass for sealing which comprised the outer surface by said free surface and non-free surface does not have machined surfaces, such as a cut surface. That is, the sealing glass can be manufactured without being subjected to machining such as cutting, and is easy to manufacture. In general, if there are machined surfaces such as cut surfaces, polished surfaces, excavated surfaces, etc. on the outer surface of the glass article, scratches and cracks are likely to occur on the machined surface, which may cause cracks and chips. The sealing glass does not have such a disadvantage because it does not have a machined surface. In addition, when the molten glass is quenched by contact with the mold, compressive stress is generated on the outer surface, particularly the non-free surface, so that scratches and cracks are less likely to occur, It can be expected that chipping is less likely to occur.

  The non-free surface usually appears at a position intersecting the short axis. The non-free surface may be formed only at one place on the outer surface or may be formed at a plurality of places. For example, non-free surfaces can be formed at two locations facing each other in the minor axis direction.

  The above non-free surface can have various arbitrary shapes within the condition that it does not have a right-angled or acute edge portion, but the non-free surface has a flat surface in its entire region or a partial region. That is, the non-free surface preferably has a flat surface. Thereby, the shape of the mold for molding the non-free surface can be simplified, and the non-free surface formed on the flat surface is placed on the sealing portion of the object to be sealed. The posture stability of the sealing glass with respect to the portion is increased, and the falling off from the sealing portion can be more effectively prevented.

  The non-free surface may be a smooth surface, but all or a part of the non-free surface should be a rough surface, particularly a satin surface, that is, the non-free surface should have a rough surface, particularly a pear surface. Is preferred. Thereby, when placed on the sealing portion of the object to be sealed, the sealing glass is less likely to slip with respect to the sealing portion, and can be more effectively prevented from falling off the sealing portion. . In addition, it is preferable that the roughness of the rough surface of the non-free surface is Ra (arithmetic average roughness defined in “JIS B0601-1994”) = 0.2 μm to 10 μm.

  In order to achieve the above object, when the present invention is placed in a predetermined posture on a horizontal plane, all cross-sections passing through the center of gravity and perpendicular to the horizontal plane are parallel to the horizontal plane. And a manufacturing method of a solid sealing glass having a flat shape having a minor axis in a direction orthogonal to the horizontal plane, and having no right or acute edge on the outer surface, and having a predetermined volume The manufacturing method of the glass for sealing which drops and forms the molten glass on a shaping | molding die is provided. The dropped molten glass becomes almost spherical due to surface tension during the fall, but the shape and surface properties of the mold are transferred to the surface that is pressed against the mold by the kinetic energy at the time of dropping. It becomes a surface (non-free surface). The surface that does not come into contact with the mold (free surface) may be a shape in which the surface shape of the molten glass (substantially spherical) is maintained as it is, but in many cases, the dropped molten glass is in the state of dropping. As a result of being pressed against the mold by the kinetic energy, the shape is shifted inward or outward with respect to the surface contour of the phantom sphere having the same volume as the dropped molten glass. For example, when the free surface is positioned above the mold, the shape is shifted inward from the surface contour of the phantom sphere, and when the free surface is positioned laterally with respect to the mold, the phantom sphere In many cases, the shape is shifted outward from the surface contour. In any of the cases described above, the molten glass dropped on the mold has a flat shape in the dropping direction.

  The entire surface of the molten glass that does not come into contact with the mold may be left as a free surface, or at least part of the surface may be pressed from above with a second mold.

  Further, in order to achieve the above object, the present invention places a solid sealing glass on the upper part of the exhaust port of the recess provided in the bottom of the outer container, and the exhaust port is made of the sealing glass by vacuum heating. A sealing method of a metal vacuum double container to be sealed, and when each sealing glass is placed in a predetermined posture on a horizontal plane, all cross sections passing through the center of gravity and orthogonal to the horizontal plane are Solid sealing for forming a flat shape having a major axis in a direction parallel to the horizontal plane and a minor axis in a direction perpendicular to the horizontal plane, and having no right or acute edge on the outer surface. Provided is a method for sealing a metal vacuum double container, which is made of glass.

  ADVANTAGE OF THE INVENTION According to this invention, the glass for sealing which has favorable attitude | position stability with respect to rolling, and is hard to generate | occur | produce a crack and a chip | tip can be provided.

  Since the manufacturing method of the present invention drops and molds a predetermined volume of molten glass onto a mold, it does not require mechanical processing such as cutting when manufacturing the glass for sealing, and a large number of glass for sealing Can be produced continuously. Therefore, according to the manufacturing method of the present invention, the sealing glass can be easily manufactured.

  Moreover, according to this invention, the sealing method of the metal vacuum double container which has few parts, is easy to work, and can perform reliable sealing can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a sealing glass 1 according to the first embodiment. The sealing glass 1 of this embodiment is made of, for example, a low melting point glass having a softening point of about 200 to 600 ° C., and when placed on the horizontal plane P in the most stable posture, the plan view has a substantially circular shape. {FIG. 1 (a)}, each cross section passing through the center of gravity G and orthogonal to the horizontal plane P has a major axis L in a direction parallel to the horizontal plane P and a minor axis S in a direction orthogonal to the horizontal plane P. It has a flat shape {FIG. 1 (b)}. The outer surface is composed of a free surface 1a formed by the surface tension of the molten glass and a non-free surface 1b (1b1, 1b2) formed by the molten glass coming into contact with the mold, There is no machined surface such as a cut surface, and there is no right or sharp edge.

  In this embodiment, the non-free surface 1b is formed as a first non-free surface 1b1 and a second non-free surface 1b2 at two locations facing each other in the minor axis S direction. Each of the first non-free surface 1b1 and the second non-free surface 1b2 is a flat surface and a satin surface (may be a smooth surface). The free surface 1a is a smooth three-dimensional curved surface that is located on the side of the first non-free surface 1b1 and the second non-free surface 1b2 and is formed by the surface tension of the molten glass. The free surface 1a has an arc shape in each of the above-described cross sections {FIG. 1 (b)}, and the radius of curvature of the arc is smaller than the radius of curvature of the phantom sphere having the same volume as the sealing glass 1. The maximum radius of the free surface 1a in the direction parallel to the horizontal plane P is larger than the radius of the phantom sphere.

  When the sealing glass 1 is brought into contact with two planes parallel to the direction of the major axis L, the distance Lm between the two planes is parallel to the length of the major axis L and the direction of the minor axis S. When the distance Sm between the two planes when the sealing glass 1 is brought into contact with the two planes is defined as the length of the minor axis S, the ratio of Sm to Lm (Sm / Lm) is: From the viewpoint of ensuring good posture stability with respect to rolling and securing an appropriate thickness for preventing cracking, it is preferably 0.2 to 0.8. A more preferable range of the ratio (Sm / Lm) is 0.24 to 0.7.

  The sealing glass 1 of this embodiment has the second non-free surface 1b2 placed on the plane P when the first non-free surface 1b1 is placed on the plane P {FIG. 1 (b)}. In this case, the posture is the most stable. Also, the posture stability against rolling is such that when the sealing glass 1 is placed on a smooth flat stainless steel plate in the most stable posture and the stainless steel plate is tilted by 30 ° with respect to the horizontal plane. It is preferable if the glass 1 does not roll.

  The sealing glass 1 of this embodiment is used, for example, in a vacuum sealing process of a metal vacuum double container 10 as shown in FIG. 10, for example, a recess 16 in the bottom 15 of the outer container 11 as shown in FIG. Placed on. The sealing glass 1 of this embodiment has a flat shape in the minor axis S direction, and is a flat surface at two locations opposite to each other in the minor axis S direction. The first non-free surface 1b1 and the second non-free surface 1b2, the first non-free surface 1b1 or the second non-free surface 1b2 is placed in the concave portion 16 with the posture facing downward. Even when an external force is applied, it does not roll off from the recess 16. In addition, since the outer surface does not have a right-angle or acute-angle edge portion, even when the glass for sealing 1 or between the glass for sealing 1 and other members are in contact with each other and rubbed with each other during transportation, Chipping is unlikely to occur. In addition, the above-described concave portion on which the sealing glass 1 is placed is not limited to the shape illustrated in FIG. 11, and may be formed in various shapes according to manufacturing conditions and the like. Is not limited to the bottom of the outer container, and may be formed in other parts of the outer container or in the inner container.

  The glass 1 for sealing of this embodiment can be manufactured by a method as shown, for example in FIG. A molding table 21 as a molding die having a flat molding surface 21a is arranged below the dropping device 20 storing the molten glass 1 ′, and a predetermined volume is dropped from the dropping device 20 at the dropping position A shown in FIG. The molten glass 1 ′ is dropped on the molding surface 21 a of the molding table 21.

The molten glass 1 ′ is obtained by melting a glass raw material prepared so as to have a predetermined composition at 800 to 1200 ° C. The composition of the glass is PbO—B ₂ O ₃ based glass, SnO—P ₂ O _5. Glass, P ₂ O ₅ —Ag ₂ O glass, ZnO—B ₂ O ₃ glass, Bi ₂ O ₃ —B ₂ O ₃ glass, etc. can be used.

The PbO-B ₂ O ₃ -based glass, PbO sixty-four to eighty-seven% represented by _{mass%, B 2 O 3 6~20%,} Bi 2 O 3 0.5~15%, SiO 2 0.1~7%, Glass containing Al ₂ O ₃ 0-5%, ZnO 0-5%, V ₂ O ₅ 0-5%.

As the SnO-P ₂ O ₅ based glass, P ₂ O ₅ 18~45% by mol% _{display, SnO 35~65%, B 2 O} 3 0~30%, 0~20% ZnO, SiO 2 0 Glass containing ˜15%, Al ₂ O ₃ 0-10%.

As the P ₂ O ₅ -Ag ₂ O-based glass, Ag ₂ O 5 to 70% by mol% display, 5~55%, AgI 0~30%, ZnO 0~55%, Nb 2 O 5 0~ Glass containing 15%, B ₂ O ₃ 0-15%, TeO ₂ 0-65%.

As the ZnO-B ₂ O ₃ based _{glass, 25~50% ZnO, B 2 O} 3 10~35%, BaO 20~50%, the glass containing SiO ₂ 0% like represented by mass% It is done.

As Bi ₂ O ₃ —B ₂ O ₃ -based glass, Bi ₂ O ₃ 30 to 50% in terms of mol%,
_{B 2 O 3 10~40%, BaO} + SrO 1~10%, include glasses containing 0 to 35% ZnO.

The volume of the molten glass 1 ′ to be dropped is 1 mm ^{3 to} 10 cm ³ , preferably 3 mm ^{3 to} 8 cm ³ , more preferably 5 mm ^{3 to} 7.5 cm ³ . Further, the dropping distance, that is, the distance (height) from the dropping position of the molten glass 1 ′ from the dropping device 20 to the molding surface 21 a of the molding table 21 is the viscosity and volume of the dropping molten glass 1 ′, In consideration of kinetic energy or the like, the molten glass 1 ′ is set to have a desired shape while being dropped on the molding surface 21a.

  The molding table 21 is rotationally driven around a rotational axis X in the vertical direction by a rotational driving means (not shown), and the molding surface 21a is finished on a satin surface by sandblasting (or shot peening). The material of the molding table 21 is not particularly limited as long as it is a heat-resistant material that is not deformed or deteriorated by heat. Silicon carbide, tungsten carbide, or the like, which is a material with low wettability with molten glass, can be used. Can be used. In addition, the surface of the molding table 21, particularly the molding surface 21a, may be subjected to a plating treatment such as nickel-tungsten alloy or chromium-tungsten alloy.

  The molten glass 1 ′ having a predetermined volume dropped from the dropping device 20 becomes a substantially spherical shape due to surface tension during dropping, but the surface that is pressed against the molding surface 21 a by the kinetic energy at the time of dropping and contacts the molding surface 21 a is: A flat, satin-like first non-free surface 1b1 to which the shape and surface properties of the molding surface 21a are transferred is obtained.

  The molten glass 1 ′ dropped on the molding surface 21 a at the dropping position A shown in FIG. 7B is sent to the second molding position B by the rotation of the molding table 21. As shown in FIG. 7C, at the second molding position B, a molding roll 22 as a second molding die having a horizontal rotational axis Y is formed between the molding surface 21a of the molding table 21 and a predetermined gap. Arranged via δ. The forming roll 22 is driven to rotate by rotation driving means (not shown), or is rotated in contact with the molten glass 1 ′ conveyed by the rotation of the forming table 21. That is, the forming roll 22 may be either a drive roll or a free roll (idling roll). Further, the cylindrical forming surface 22a of the forming roll 22 is finished on a satin surface by sandblasting (or shot peening). In addition, said gap (delta) is set to the dimension substantially equal to the length Sm of the short axis S of the glass 1 for sealing after shaping | molding.

  When the molten glass 1 ′ sent to the second molding position B by the rotation of the molding table 21 passes through the gap δ between the molding surface 21 a of the molding table 21 and the molding surface 22 a of the molding roll 22, the molding surface A part of the surface that does not come into contact with 21a is pressed by the molding surface 22a of the molding roll 22 to form a flat, satin-like second non-free surface 1b2 to which the shape and surface properties of the molding surface 22a are transferred.

  The molten glass 1 ′ that has passed through the second molding position B is cooled at the cooling position C and solidifies. Thereby, the glass 1 for sealing of the shape shown in FIG. 1 is manufactured. Thereafter, the sealing glass 1 is sent to the discharge position D, and is discharged from the molding table 21 at the discharge position D.

  Moreover, the glass 1 for sealing of this embodiment can also be manufactured by a method as shown, for example in FIG. A forming belt 25 as a forming die having a flat forming surface 25a is disposed below the dropping device 20 storing the molten glass 1 ′, and a predetermined volume of the molten glass 1 ′ is formed from the dropping device 20 at the dropping position. 25 is dropped on the molding surface 25a.

  The forming belt 25 is driven infinitely by a drive roller 27, and the forming surface 25a is finished on a satin surface by sandblasting (or shot peening).

  The molten glass 1 'having a predetermined volume dropped from the dropping device 20 becomes a substantially spherical shape due to surface tension during dropping, but the surface that is pressed against the molding surface 25a by the kinetic energy at the time of dropping and contacts the molding surface 25a is: A flat, satin-like first non-free surface 1b1 to which the shape and surface properties of the molding surface 25a are transferred is obtained.

  The molten glass 1 ′ dropped on the molding surface 25 a at the dropping position is sent to the second molding position by the horizontal movement of the molding belt 25. At the second molding position, a molding punch 26 as a second molding die that operates in the vertical and horizontal directions is arranged. The flat molding surface 26a of the molding punch 26 is finished on a satin surface by sandblasting (or shot peening).

  The molten glass 1 ′ sent to the second molding position by the movement of the molding belt 25 is partially in contact with the molding surface 25 a by the lowering operation of the molding punch 26 and the horizontal movement operation synchronized with the movement of the molding belt 25. Is pressed by the molding surface 26a of the molding punch 26 to form a flat, satin-like second non-free surface 1b2 to which the shape and surface properties of the molding surface 26a are transferred. Instead of the forming punch 26, a forming roll (22) as shown in FIG. 7 may be used.

  The molten glass 1 ′ that has passed through the second molding position is cooled and solidified at the cooling position. Thereby, the glass 1 for sealing of the shape shown in FIG. 1 is manufactured. Thereafter, the sealing glass 1 is sent to the discharge position, where it drops from the forming belt 25 and is discharged.

  Moreover, the glass 1 for sealing of this embodiment can also be manufactured by a method as shown, for example in FIG. A forming roll 30 as a forming die having a cylindrical forming surface 30a is arranged below the dropping device 20 storing the molten glass 1 ', and a predetermined volume of molten glass 1' is formed from the dropping device 20 at the dropping position. It is dropped on the molding surface 30 a of the roll 30.

  The forming roll 30 is rotationally driven around a rotation axis Y1 in the horizontal direction by a rotation driving means (not shown), and the forming surface 30a is finished on a satin surface by sandblasting (or shot peening).

  The molten glass 1 'having a predetermined volume dropped from the dropping device 20 becomes a substantially spherical shape due to surface tension during dropping, but the surface that is pressed against 30a by the kinetic energy at the time of dropping and contacts the molding surface 30a is the molding surface. It becomes a satin-like surface to which the shape and surface properties of 30a are transferred.

  The molten glass 1 ′ dropped on the molding surface 30 a at the dropping position is sent to the second molding position by the rotation of the molding roll 30. At the second molding position, a second molding roll 31 as a second molding die having a horizontal rotation axis Y2 is disposed via a molding surface 30a of the molding roll 30 and a predetermined gap. The second forming roll 31 is driven to rotate by rotation driving means (not shown), or rotates in contact with the molten glass 1 ′ conveyed by the rotation of the forming roll 30. That is, the second forming roll 31 may be either a drive roll or a free roll (idling roll). Further, the cylindrical forming surface 31a of the second forming roll 31 is finished on a satin surface by sandblasting (or shot peening). In addition, said gap is set to the dimension substantially equal to length Sm of the short axis S of the glass 1 for sealing after shaping | molding.

  When the molten glass 1 ′ sent to the second molding position by the rotation of the molding roll 30 passes through the gap between the molding surface 30 a of the molding roll 30 and the molding surface 31 a of the second molding roll 31, the molding surface A part of the surface that does not come into contact with 30 a is pressed and molded by the molding surface 31 a of the second molding roll 31. Accordingly, the molten glass 1 ′ that has passed through the gap has a flat, satin-like first non-free surface 1 b 1 to which the shape and surface properties of the forming surface 30 a of the forming roll 30 are transferred, and the forming surface of the second forming roll 31. It has a flat, satin-like second non-free surface 1b2 to which the shape and surface properties of 31a are transferred. In FIG. 9, the rotational axis Y1 of the molding roll 30 and the rotational axis Y2 of the second molding roll 31 are arranged in the same horizontal plane, but the rotational axis Y2 of the second molding roll 31 is molded. The rotation axis Y1 of the roll 30 may be arranged so as to be shifted obliquely upward in the left direction in FIG.

  FIG. 2 shows the sealing glass 1 according to the second embodiment. In the sealing glass 1 of this embodiment, the outer surface is composed of one free surface 1a located above the short axis S direction and one non-free surface 1b located below the short axis S direction in FIG. It is configured. The free surface 1a is a smooth three-dimensional curved surface formed by the surface tension of molten glass, and the non-free surface 1b is a three-dimensional curved surface to which the shape and surface properties of the mold are transferred, and is a satin surface. (It may be a smooth surface). The sealing glass 1 of this embodiment forms a molding surface of a molding die for dropping molten glass into a three-dimensional curved surface corresponding to the shape of the non-free surface 1b in the manufacturing method described above, and is in contact with the molding die. It can be produced by leaving the entire surface of the molten glass as a free surface over the entire surface (no pressing with the second mold).

  FIG. 3 shows a sealing glass 1 according to the third embodiment. In the sealing glass 1 of this embodiment, the outer surface is composed of one free surface 1a located above the short axis S direction and one non-free surface 1b located below the short axis S direction in FIG. It is configured. The free surface 1a is a smooth three-dimensional curved surface formed by the surface tension of the molten glass, and the non-free surface 1b is a flat surface to which the shape and surface properties of the mold are transferred, and is a satin surface ( Smooth surface). The sealing glass 1 of this embodiment can be manufactured by leaving the surface of the molten glass that does not come into contact with the mold as a free surface over the entire surface in the manufacturing method described above (second molding). Do not press mold with a mold).

  FIG. 4 shows a sealing glass 1 according to the fourth embodiment. In the sealing glass 1 of this embodiment, the first non-free surface 1b1 and the second non-free surface 1b2 and the first non-free surface 1b1 and the second non-free surface whose outer surfaces are opposed to each other in the minor axis S direction. The free surface 1a is located on the side of the non-free surface 1b2. The free surface 1a is a smooth three-dimensional curved surface formed by the surface tension of the molten glass. The first non-free surface 1b1 is a surface to which the shape and surface properties of the mold are transferred, the peripheral portion 1b11 is a flat surface, the central portion 1b12 is a convex three-dimensional curved surface, and is a satin surface (smooth) Surface). Similarly to the first non-free surface 1b1, the second non-free surface 1b2 is a surface to which the shape and surface properties of the mold are transferred, the peripheral portion 1b11 is a flat surface, and the central portion 1b12 is a convex three-dimensional curved surface. In addition, it is a satin surface (may be a smooth surface). The sealing glass 1 according to this embodiment is a part of the molten glass that does not come into contact with the molding die by forming the molding surface of the molding die for dropping the molten glass into a shape corresponding to the non-free surface 1b1 in the manufacturing method described above. It can be manufactured by forming the molding surface of the second mold for molding by pressing the surface into a shape corresponding to the non-free surface 1b2.

  FIG. 5 shows a sealing glass 1 according to the fifth embodiment. In the sealing glass 1 of this embodiment, the first non-free surface 1b1 and the second non-free surface 1b2 and the first non-free surface 1b1 and the second non-free surface whose outer surfaces are opposed to each other in the minor axis S direction. The free surface 1a is located on the side of the non-free surface 1b2. The free surface 1a is a smooth three-dimensional curved surface formed by the surface tension of the molten glass. The first non-free surface 1b1 is a surface to which the shape and surface properties of the mold are transferred, and has an annular intermediate portion 1b14 in plan view between the peripheral portion 1b13 and the central portion 1b15, and the peripheral portion 1b13 The central portion 1b15 is a flat surface, the intermediate portion 1b14 is a convex three-dimensional curved surface, and is a satin surface (may be a smooth surface). Similarly to the first non-free surface 1b1, the second non-free surface 1b2 is a surface onto which the shape and surface properties of the mold have been transferred, and an intermediate ring in plan view between the peripheral portion 1b23 and the central portion 1b25. The peripheral portion 1b23 and the central portion 1b25 are flat surfaces, the intermediate portion 1b24 is a convex three-dimensional curved surface, and is a satin surface (may be a smooth surface). The sealing glass 1 according to this embodiment is a part of the molten glass that does not come into contact with the molding die by forming the molding surface of the molding die for dropping the molten glass into a shape corresponding to the non-free surface 1b1 in the manufacturing method described above. It can be manufactured by forming the molding surface of the second mold for molding by pressing the surface into a shape corresponding to the non-free surface 1b2.

  FIG. 6 shows a sealing glass 1 according to the sixth embodiment. In the sealing glass 1 of this embodiment, the first non-free surface 1b1 and the second non-free surface 1b2 and the first non-free surface 1b1 and the second non-free surface whose outer surfaces are opposed to each other in the minor axis S direction. The free surface 1a is located on the side of the non-free surface 1b2. The free surface 1a is a smooth three-dimensional curved surface formed by the surface tension of the molten glass. The first non-free surface 1b1 is a surface onto which the shape and surface properties of the mold are transferred, the peripheral portion 1b16 is a concave three-dimensional curved surface, the central portion 1b17 is a convex three-dimensional curved surface, and the pear surface Yes (may be a smooth surface). Similarly to the first non-free surface 1b1, the second non-free surface 1b2 is a surface to which the shape and surface properties of the mold are transferred, the peripheral portion 1b26 is a concave three-dimensional curved surface, and the central portion 1b27 is convex. It is a three-dimensional curved surface and a satin surface (may be a smooth surface). The sealing glass 1 according to this embodiment is a part of the molten glass that does not come into contact with the molding die by forming the molding surface of the molding die for dropping the molten glass into a shape corresponding to the non-free surface 1b1 in the manufacturing method described above. It can be manufactured by forming the molding surface of the second mold for molding by pressing the surface into a shape corresponding to the non-free surface 1b2.

  In the sealing glass of the above embodiment, the shape in plan view is not limited to a circular shape, and an oval shape, an oval shape, or the like, provided that the outer surface does not have a right or acute edge. It may be a shape.

First, in terms of mass%, PbO 82.8%, B ₂ O ₃ 11.1%, Bi ₂ O ₃ 2.7%, SiO ₂ 0.3%, Al ₂ O ₃ 0.8%, ZnO 1. 8%, to prepare a glass raw material so that the V ₂ O ₅ 0.5% was then put in a platinum crucible for 1 hour melted at 1000 ° C..

  Next, molten glass was dropped onto a flat plate made of carbon by inclining a platinum crucible from a height of 1 m and allowed to cool to produce a sealing glass. As shown in FIG. 3, the sealing glass after manufacture has a smooth three-dimensional curved surface formed by the surface tension of the molten glass (free surface 1a) and does not contact the flat plate. The resulting surface was a flat surface (non-free surface 1b), and became flat in the minor axis direction. The length Lm of the major axis L was 5 mm, and the length Sm of the minor axis S was 3 mm. Moreover, a right-angled or acute edge portion was not recognized on the outer surface of the sealing glass.

  Further, this sealing glass was placed on a stainless steel flat plate (surface is 2B finish defined by JIS) with the flat surface (non-free surface 1b) down, and the flat plate was tilted. The sealing glass did not move with respect to the flat plate until the angle became 30 °. The glass for sealing started to move from the point where the inclination of the flat plate exceeded 30 °, but slipped off without rolling even when the inclination of the flat plate was increased.

The glass raw material was prepared so that it would be 30% P ₂ O ₅ , 48% SnO, 10% ZnO, 10% B ₂ O ₃ , ₂ % Al ₂ O ₃ in terms of mol%, and put into a platinum crucible. It was melted at 1000 ° C. for 1 hour in a nitrogen atmosphere using a furnace.

  Next, after dropping the molten glass by inclining a platinum crucible from a height of 1 m onto a flat plate made of carbon, a partial surface of the molten glass that does not contact the flat plate is pressed from above with a flat surface of the jig, Further, it was allowed to cool to produce a sealing glass. As shown in FIG. 1, the sealing glass after manufacture has a smooth three-dimensional curved surface formed by the surface tension of the molten glass (free surface 1a), and the surface not in contact with the flat plate is cured with the flat plate. The surfaces in contact with the tools were flat surfaces (non-free surfaces 1b1, 1b2), and were flat in the minor axis direction. The length Lm of the major axis L was 4 mm, and the length Sm of the minor axis S was 2 mm. Moreover, a right-angled or acute edge portion was not recognized on the outer surface of the sealing glass.

  Further, this sealing glass was placed on a stainless steel flat plate (surface is 2B finish defined by JIS) with the flat surface (non-free surface 1b1 or 1b2) down, and the flat plate was inclined. The sealing glass did not move with respect to the flat plate until the inclination of 30 ° became 30 °. The glass for sealing started to move from the point where the inclination of the flat plate exceeded 30 °, but slipped off without rolling even when the inclination of the flat plate was increased.

  The glass for sealing of the present invention can be used for hermetic sealing of sensors, LEDs, fluorescent lamps, etc., in addition to sealing a metal vacuum double container.

1 shows a sealing glass according to a first embodiment of the present invention, in which FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view taken along line bb of FIG. FIG. 2A shows a sealing glass according to a second embodiment of the present invention, FIG. 2A is a plan view, and FIG. 2B is a bb cross-sectional view of FIG. FIG. 3A shows a sealing glass according to a third embodiment of the present invention, FIG. 3A is a plan view, and FIG. 3B is a bb cross-sectional view of FIG. FIG. 4A shows a sealing glass according to a fourth embodiment of the present invention, FIG. 4A is a plan view, and FIG. 4B is a bb cross-sectional view of FIG. FIG. 5A shows a sealing glass according to a fifth embodiment of the present invention, FIG. 5A is a plan view, and FIG. 5B is a bb cross-sectional view of FIG. FIG. 6A shows a sealing glass according to a sixth embodiment of the present invention, FIG. 6A is a plan view, and FIG. 6B is a bb cross-sectional view of FIG. FIG. 7A is a side view, FIG. 7B is a view of the molding table as viewed from above, and FIG. 7C is a second molding. FIG. 6 is an enlarged view schematically showing a molding mode at position B. It is a side view which shows notionally the other manufacturing method of the glass for sealing which concerns on embodiment. It is a side view which shows notionally the other manufacturing method of the glass for sealing which concerns on embodiment. It is a partially broken sectional view showing an example of a metal vacuum double container. It is a partial expanded sectional view which shows an example of the periphery of the sealing location of a metal vacuum double container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass for sealing 1a Free surface 1b, 1b1, 1b2 Non-free surface 1 'Molten glass 21 Molding table (molding die)
22 Forming roll (second forming mold)
25 Molding belt (molding die)
26 Mold punch (second mold)
30 Forming roll (molding die)
31 Forming roll (second forming mold)

Claims (5)

When placed in a predetermined posture on a horizontal plane, all cross sections passing through the center of gravity and perpendicular to the horizontal plane have a major axis in a direction parallel to the horizontal plane and a minor axis in a direction perpendicular to the horizontal plane. A solid sealing glass that has a flat shape and does not have a right or sharp edge on the outer surface,
Sealing glass in which the outer surface is composed of a free surface formed by surface tension of molten glass and a non-free surface formed by contacting the molten glass with a mold.   The sealing glass according to claim 1, wherein the non-free surface has a flat surface.   The sealing glass according to claim 1, wherein the non-free surface has a rough surface.   When placed in a predetermined posture on a horizontal plane, all cross sections passing through the center of gravity and perpendicular to the horizontal plane have a major axis in a direction parallel to the horizontal plane and a minor axis in a direction perpendicular to the horizontal plane. A method for producing a solid sealing glass that has a flat shape and does not have a right or acute edge on the outer surface, and is formed by dropping a predetermined volume of molten glass onto a mold. Manufacturing method of glass for sealing. Sealing of a metal vacuum double container in which a solid sealing glass is placed on the upper part of the exhaust port of the recess provided at the bottom of the outer container, and the exhaust port is sealed with the sealing glass by vacuum heating. Stop method,
When the sealing glass is placed in a predetermined posture on a horizontal plane, all cross sections passing through the center of gravity and perpendicular to the horizontal plane are perpendicular to the horizontal plane and the major axis in a direction parallel to the horizontal plane. A metal vacuum double container, characterized in that it is a solid sealing glass having a flat shape with a minor axis in the direction to be cut and having no right or acute edge on the outer surface. Stop method.

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