JP2009155175A - Heating tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating tool which is not deformed upon sintering, and to provide a heating tool which is not deformed upon sintering, and whose fracture strength can be improved. <P>SOLUTION: Disclosed is the heating tool used for heating a press frit precursor having recessed parts or hole parts formed by press-molding granules made by mixing glass powder with vehicles, and the heating tool is provided with a positioning member in which projecting parts inserted into the recessed parts or hole parts are formed. Also disclosed is the heating tool in which the profile shape of each projecting part is molded so as to be the shape of each recessed part or hole part desired by press frit after sintering. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heating jig used for manufacturing a press frit.

  Conventionally, a press frit is similar to a sealing surface of an object to be sealed by press molding a low melting glass powder or a mixture of a low melting glass powder and a refractory filler powder (hereinafter referred to as a low melting glass powder). It is a sealing material processed into a shape, and is used for bonded parts that require reliability such as insulation, airtightness, watertightness, heat resistance, etc. of metal, glass, ceramics and the like. As its features, it can be sealed simply by setting a press frit on the seal part and heating it, so it is easier to handle compared to powdered sealing materials, can be used in a constant amount, and is easy to automate. . Applications include sealing the mouth of a sheathed heater, insulating and fixing a glow plug metal part for an engine, fixing an exhaust pipe for a display, vacuum sealing a thermos, and sealing an airtight terminal.

  This press frit was originally used in a relatively simple shape such as a disk or ring. However, as described above, this press frit is provided with a flange at one end of an annular press frit as shown in FIG. 12 (as shown in FIG. 12). Or with a complicated shape such as two types of annular press frit with the same outer diameter but different inner diameters (cross-sectional shape with a step on the inner diameter side) Has come to be used.

  Thus, even if the shape of the press frit is complicated, the material to be used is a mixture of glass powder and filler powder, and then a resin such as methylcellulose and nitrocellulose and a solvent such as α-terpineol and amyl acetate. A granule having a particle size of about 100 μm is used by adding a vehicle containing Then, the granules are filled in a mold and press-molded to prepare a press frit precursor. Finally, the press frit precursor is temporarily fired at 200 to 350 ° C., the resin component is volatilized and burned, and sintered at 330 to 430 ° C. to prepare a press frit (Patent Document 1). This pre-firing or sintering was carried out on a ceramic or stainless steel plate and processed with a sufficient space above the press frit precursor so that the resin component was easily volatilized. .

JP 2006-169018 A

  However, as described above, when pre-firing or sintering a complex shape with a sufficient space above the press frit precursor, the outer shape of the thin portion of the press-molded material is deformed. I was able to do things. In this way, if the shape is deformed during pre-firing or sintering, the press frit may be chipped or cracked at the pre-sealing stage, or the press frit cannot be set at a predetermined position during sealing, and good sealing cannot be performed. There was a risk of it.

  Sintering is performed at a temperature in the vicinity of the softening point of the glass powder constituting the press frit. However, when the sintering temperature is raised, part of the glass powder melts and bonds between the particles, and the bonding area increases. Therefore, although the fracture strength of the press frit is improved, deformation due to shrinkage becomes a problem as the bonding area between particles increases, and a desired shape cannot be obtained.

  Therefore, an object of the present invention is to provide a heating jig that does not deform during sintering and a heating jig that does not deform during sintering and can improve the fracture strength.

  The inventors of the present invention have examined deformation during pre-baking and sintering, and the balance of heat applied to the press frit precursor is lost between the surface in contact with the plate of the press frit precursor and the open surface. In addition, it was assumed that the shape of the press frit precursor was complicated, so that the shrinkage did not occur uniformly and was deformed. Furthermore, since the inside of the depression or hole of the press frit precursor is not limited at all and is sintered and contracted, it was thought that if the desired shape can be finely adjusted using the contraction, the shape defect can be reduced. .

  Therefore, in order to solve the above-mentioned problem, the invention corresponding to claim 1 is a press frit precursor in which a glass powder and a vehicle are mixed to form a granule, and a depression or a hole is formed. The heating jig used at the time of heating provided the positioning member in which the convex part inserted in the said concave part or hole was formed. Thereby, sufficient space formed in the non-contact part at the time of sintering of a press frit precursor can be decreased by making a positioning member adjoin. Therefore, since the difference in heat conduction and heat dissipation with respect to the press frit precursor can be reduced, the press frit precursor is contracted in a well-balanced manner and the shape deformation can be reduced.

  The invention corresponding to claim 2 is a heating jig for heating a press frit precursor formed by press molding a glass powder and a vehicle to form a granule and forming a recess or a hole. The positioning member formed with the convex part inserted in a dent part or a hole part, and the opposing member used facing this positioning member were comprised. As a result, the press frit precursor can be sandwiched between the positioning member and the opposing member, so that differences in heat conduction and heat dissipation can be reduced. Therefore, the press frit contracts in a well-balanced manner, and the shape deformation can be reduced.

  According to a third aspect of the present invention, in the heating jig corresponding to the first or second aspect, the outer shape of the convex portion is formed into the shape of a concave portion or a hole portion desired by the sintered press frit. Thereby, since the press frit shrunk by sintering contacts with the convex part, it becomes possible to form an accurate hole shape. Further, the shrinkage of the press frit precursor can proceed even after contacting the convex portion, so that the fracture strength of the press frit can be improved.

  The invention corresponding to claim 4 is the heating jig corresponding to any one of claims 1 to 3, wherein the member is attached to each press frit precursor. Thereby, even if the shape of the press frit precursor is different, the sintering process can be performed together.

  Since the heating jig of the present invention can be sintered by inserting the convex portion of the positioning member into the concave portion or hole portion of the press frit precursor, the difference in heat conduction and heat dissipation with respect to the press frit precursor is reduced. be able to. Therefore, shrinkage can be performed in a well-balanced manner, and variations in shape deformation can be reduced. In addition, even if the press frit precursor comes into contact with the convex portion due to shrinkage, the sintering can be further promoted, so that the bonding area of the melted glass between the particles increases, so that the press frit sintering strength is improved. be able to.

  In the best mode of the heating jig of the present invention, it is used when sintering a press frit precursor in which a glass powder and a vehicle are mixed to form a granule and a recess or a hole is formed. This jig includes a positioning member on which a concave portion or a convex portion to be inserted into the hole portion is formed, and an opposing member used as a pair with the positioning member.

  The positioning member has convex portions formed at equal intervals, and this convex portion may be formed on one surface of a flat plate or may be formed in the concave portion by forming a plurality of hollow portions on the flat plate. Regarding the material, it is heated to the desired temperature of the glass powder that constitutes the press frit precursor, so it can withstand high temperatures and is difficult to join softened glass, made of stainless steel with an oxide film on the surface, made of aluminum nitride, alumina The one made of can be used. The desired temperature of the glass powder described above means a temperature from “the third inflection point of DTA−20 ° C.” to “the fourth inflection point of DTA”.

  The opposing member is a plate-like member that is used to place or cover the press frit precursor. This material is also made of stainless steel, aluminum nitride, alumina with an oxide film formed on the surface. The one made of can be used. In addition, in order to keep the clearance gap between a positioning member and an opposing member constant, a spacer can also be interposed.

The positioning member and the opposing member are preferably made of the same material so that the amount of heat is equally applied to the press frit precursor. Further, since the positioning member and the opposing member are in contact with the press frit precursor during sintering, the difference in thermal expansion coefficient from the press frit precursor is set to 20 × 10 ⁻⁷ to 80 × 10 ⁻⁷ / ° C. And it is preferably 35 × 10 ⁻⁷ to 70 × 10 ⁻⁷ / ° C., and more preferably 45 × 10 ^{−7 to} 65 × 10 ⁻⁷ / ° C. It should be noted that a positioning member having a larger thermal expansion coefficient (easily expanded) is used than the press frit precursor. As a result, even if the press frit precursor contracts due to sintering and comes into contact with the convex portion of the positioning member, the positioning member shrinks more quickly during cooling, so that it becomes easier to peel off from the sintered body.

The press frit precursor is prepared by first mixing glass powder that has passed through a sieve having an opening of 105 μm and a vehicle (if necessary, a refractory filler) into granules having an average particle size of 44 to 256 μm. A desired amount is put in a mold and press molded at a pressure of 5 × 10 ⁴ to 50 × 10 ⁴ kPa. As the glass powder, lead-free glass such as SnO—P ₂ O ₃ , SiO ₂ —B ₂ O ₃ , Bi ₂ O ₃ —B ₂ O ₃ , SiO ₂ —ZnO, B ₂ O ₃ —ZnO, etc. Or lead-containing glass can be used.

  The press frit precursor is sintered in a sintering furnace, heated to a temperature at which the vehicle decomposes, and heated at that temperature for 30 to 120 minutes. Subsequently, the glass powder is heated to the desired temperature and heated at this temperature for 10-60 minutes. Then, the temperature is lowered to room temperature (about 25 ° C.).

  This heating jig can be used for both a batch-type heating furnace and a continuous-type heating furnace.

(Embodiment 1)
In this embodiment, a positioning member having a plate-like member formed with a plurality of convex portions and a counter member having a hole portion into which a press frit precursor is formed are used. Note that the convex portion and the hole portion are arranged to face each other so that the central axis of the convex portion comes to the central axis of the hole portion.

Example 1
This embodiment is a heating jig composed of a positioning member shown in FIG. 1 and an opposing member shown in FIG.

The positioning member 101 is formed by pressing a stainless steel plate (thermal expansion coefficient (α) 130 × 10 ⁻⁷ / ° C.) having a length of 80 mm, a width of 80 mm, and a thickness of 1 mm into 9 convex portions 102 having a diameter of 10 mm and a height of 5 mm. Individually molded. The protrusions 102 are formed at equal intervals, and the distance between the central axes of the protrusions 102 adjacent in the vertical and horizontal directions is 25 mm.

The counter member 103 is formed by punching a stainless steel plate material (thermal expansion coefficient (α) 130 × 10 ⁻⁷ / ° C.) having a length of 80 mm, a width of 80 mm, and a thickness of 1 mm into nine holes 104 having a diameter of 20 mm and a height of 5 mm. Individually molded. The hole portions 104 were formed at equal intervals, and the distance between the central axes of the hole portions 104 adjacent in the vertical and horizontal directions was 25 mm.

The press frit precursor 105 (thermal expansion coefficient (α) 70 × 10 ⁻⁷ / ° C.) sintered by this heating jig is a cylindrical one press-molded to an outer diameter of 18 mm, an inner diameter of 11 mm, and a height of 4 mm. is there.

  Then, the press frit precursor 105 is put into the hole 104 of the facing member 103, and the convex portion 102 of the positioning member 101 is put over the hole 104 of the press frit precursor 105 from above, and The bottom surface of the hole 104 and the top of the convex portion 102 of the positioning member 101, and the flat portion of the facing member 103 and the flat portion of the positioning member 101 are brought into contact with each other. This is put into a sintering furnace and first heated to a temperature at which the vehicle decomposes, and then heated at that temperature for 60 minutes. Subsequently, the glass powder was heated to the desired temperature and heated at this temperature for 20 minutes. And it cooled to room temperature (about 25 degreeC), and manufactured the press frit. And when the positioning member 101 was removed from the opposing member 103, the press frit was not joined to the convex part 102. Further, no press frit was bonded to the facing member 103. This is probably because the stainless steel member contracts faster when the temperature is lowered because the thermal expansion coefficient of the positioning member 101 and the opposing member 103, which are stainless steel members, is higher than that of the press frit.

  Then, the shape characteristics (outer diameter and inner diameter) and strength of the manufactured press frit were measured. The results are shown in Table 1. The outer diameter and inner diameter were measured at four locations for one press frit with a factory microscope (TMM-100DN) manufactured by TOPCON, and the degree of individual deformation was observed based on the width of the measured values. The diameter measurement with this factory microscope is a press equipped with a microscope that is fixed on a slidable table in the XY direction on the Y axis of the XY coordinate axis that can be seen when looking into the eyepiece. Align so that the frit touches, and set the point to coordinate 0. Next, this data base is translated in the X-axis direction, and the coordinates of the position in contact with the Y-axis are set as the length of the reading diameter. The second to fourth measurements were performed by rotating the data base 45 degrees clockwise from the first measurement position. The magnification of the microscope was 10 times.

  The strength was measured based on the principle of JIS R1601 “Method for measuring the bending strength of fine ceramics”. Actually, DS2-200N made by IMADA is used as a measuring machine, the flat part of the press frit (the surface that contacts the positioning member or the opposing member) is supported by two supports, and a round push bar is placed from above the press frit. Was pressed at a speed of 2 mm / min, and the strength when broken was measured.

  “Ratio 1” in the table (Comparative Example 1) is a press frit prepared by placing a press frit precursor on a stainless steel plate and sintering it without using the positioning member 101. is there. “Ratio 2” (Comparative Example 2) was sintered by the same method as in Ratio 1, but the sintering temperature was such that the amount of deformation of the outer diameter and inner diameter was comparable to those of the present invention. Was sintered at a lower temperature.

  From Table 1, nine samples had an outer diameter “maximum-minimum” of 0.03 to 0.08 mm, an inner diameter “maximum-minimum” of 0.01 to 0.05 mm, and a strength of 23 to 30 N. . From this, an outer diameter and an inner diameter having a smaller deformation amount than that of Comparative Example 1 were obtained, and the effects of the present invention could be confirmed. In particular, with respect to the inner diameter, since the shape of the convex portion 102 is transferred, a small deformation amount was obtained. As for the strength, a material having a higher breaking strength than Comparative Example 2 was obtained. That is, according to the present invention, it was possible to reduce the shape deformation of the press frit and improve the strength.

  Furthermore, when manufacturing what made sintering time 60 minutes and measuring the shape characteristic and intensity | strength, the deformation amount of an outer diameter and an internal diameter was the same as what was mentioned above, What improved the intensity | strength rather than what was mentioned above was obtained. This was because the sintered density was improved and the bonding area of the glass component in the press frit was increased.

  In this embodiment, the stainless steel plate material is press-molded in a non-porous state to form the positioning member 101 and the opposing member 103, but a plate in which small holes are formed may be used. When the positioning member 101 and the counter member 103 are formed of the plate material having holes as described above, gas components generated from the press frit precursor 105 during decomposition and removal of the vehicle and sintering are less likely to stay in the hole 104. It is preferable in that good sintering can be performed without leaving an organic substance such as carbon in the press frit. The press frit precursor 105 was placed in a heating jig, and the vehicle was decomposed and removed in a single sintering process. The press frit precursor was preliminarily fired to decompose and remove the vehicle in advance. The pre-fired body may be put in a heating jig and sintered to produce a press frit.

(Example 2)
This embodiment is an example in which the press frit precursor shown in FIG. 6 is sintered into a press frit by a heating jig constituted by the positioning member shown in FIG. 4 and the opposing member shown in FIG.

The positioning member 201 has a diameter of 10 mm, a height of 3 mm, a diameter of 14 mm, and a height of 2 mm by press forming a stainless steel plate (thermal expansion coefficient (α) 100 × 10 ⁻⁷ / ° C.) having a length of 80 mm, a width of 80 mm, and a thickness of 1 mm. Nine convex portions 202 having a shape in which the cylinders are stacked are formed.

The opposing member 203 has a thickness in which a through hole 206 having a diameter of 20 mm is formed on a stainless steel plate 204 (thermal expansion coefficient (α) 100 × 10 ⁻⁷ / ° C.) having a length of 80 mm, a width of 80 mm, and a thickness of 1 mm. A 5 mm stainless steel plate 205 is joined and integrated, and one end of the through hole 206 is closed with a plate 204. In addition, the through-holes 206 of the plate member 205 are formed at equal intervals, and the distance between the central axes of the through-holes 206 adjacent in the vertical and horizontal directions is 25 mm.

A press frit precursor 207 (thermal expansion coefficient: 70 × 10 ⁻⁷ / ° C.) sintered with this heating jig is pressed to an outer diameter of 18 mm, a large inner diameter of 15 mm, a small inner diameter of 11 mm, a height of 4 mm, and a step height of 2 mm. It has a cylindrical shape with a stepped portion formed inside.

  Then, the press frit precursor 207 is inserted from the opening end of the through hole 206 of the facing member 203 so that the large inner diameter is upward, and the convex portion 202 of the positioning member 201 is inserted into the hole 208 of the press frit precursor 207 from above. The plate member 204 of the opposing member 203 and the top of the convex portion 202 of the positioning member 201, and the plate member 205 of the opposing member 203 and the flat portion of the positioning member 201 are brought into contact with each other. This is put in a sintering furnace and first heated to a temperature at which the vehicle decomposes, and then heated at that temperature for 80 minutes. Subsequently, the glass powder was heated to the desired temperature and heated at this temperature for 40 minutes. And it cooled to room temperature (about 25 degreeC), and manufactured the press frit. Also in this example, the press frit was not joined to the positioning member 201 and the facing member 203.

  Then, the shape characteristics (outer diameter, large inner diameter and small inner diameter) and strength of the manufactured press frit were measured in the same manner as in Example 1. The results are shown in Table 2.

  “Ratio 1” and “Ratio 2” in the table are samples prepared under the same conditions as those shown in Example 1 above.

  From Table 2, nine samples had an outer diameter “maximum-minimum” of 0.03 to 0.09 mm, and an inner diameter “maximum-minimum” of 0.01 to 0.04 mm. The strength was 14-18N. From this, an outer diameter and an inner diameter having a smaller deformation amount than that of Comparative Example 1 were obtained, and the effects of the present invention could be confirmed. In particular, with respect to the inner diameter, since the shape of the convex portion 102 is transferred, a small deformation amount was obtained. As for the strength, a material having a higher breaking strength than Comparative Example 2 was obtained.

  In this embodiment, the opposing member 203 is formed by joining two types of stainless steel plate materials. However, the facing member 203 is not limited to stainless steel, and ceramic members such as alumina and aluminum nitride are joined as described above. It may be formed.

(Embodiment 2)
In this embodiment, the opposing member is a plate material, a hole portion for inserting the press frit precursor is formed in the positioning member, and a convex portion is formed on the bottom surface of the hole portion.

(Example 3)
This embodiment is an example in which the press frit precursor 105 shown in FIG. 3 is sintered into a press frit by a heating jig composed of a positioning member 301 shown in FIG. 7 and a plate-like counter member (not shown). is there.

The positioning member 301 is formed by press-molding a stainless steel plate material (thermal expansion coefficient: 140 × 10 ⁻⁷ / ° C.) having a length of 80 mm, a width of 80 mm, and a thickness of 1 mm, and a hole 302 having a diameter of 20 mm and a depth of 5 mm. Nine convex portions 303 having a diameter of 10 mm and a height of 5 mm are formed from the bottom of the portion 302. The hole portion 302 and the convex portion 303 are formed concentrically, and nine holes are formed on the plate material at equal intervals with a distance of 25 mm from the vertically adjacent center.

  The counter member was a stainless steel plate having a length of 80 mm, a width of 80 mm, and a thickness of 1 mm.

  The press frit precursor to be sintered had the same shape as that shown in FIG.

  Then, after inserting the hole of the press frit precursor 105 into the convex portion 303 of the positioning member 301 and placing the press frit precursor 105 in the hole, the stainless steel plate is put on the positioning member 301. A press frit was manufactured by placing in a heating furnace and sintering in the same manner as in Example 1.

  The shape characteristics and strength of the manufactured press frit were also measured in the same manner as in Example 1, and the results are shown in Table 3.

  From Table 3, the nine samples had an outer diameter “maximum-minimum” of 0.02 to 0.09 mm, an inner diameter “maximum-minimum” of 0.02 to 0.04 mm, and a strength of 23 to 30 N. . Also in this example, it was possible to obtain a press frit with less shape deformation and improved strength.

  In this embodiment, the plate member is used as the counter member. However, if the positioning member 301 is stacked in multiple stages and sintered in a heating furnace, the outer bottom surface of the positioning member functions in the same manner as the counter member. May not be used.

Example 4
This embodiment is an example in which the press frit precursor 105 shown in FIG. 3 is sintered into a press frit by a heating jig composed of a positioning member 401 shown in FIG. 8 and a plate member facing member (not shown).

  The positioning member 401 is formed by pressing a stainless steel plate 402 having a length of 80 mm, a width of 80 mm, and a thickness of 1 mm to form a convex portion 403 having a diameter of 10 mm and a height of 5 mm. A through-hole 405 having a diameter of 20 mm is formed on the plate 402. The formed stainless steel plate 404 having a thickness of 5 mm is disposed and joined in the through hole 405 so that the convex portion 403 is concentric with the through hole 405. Thereby, one end of the through hole 405 of the plate material 404 is closed by the plate material 402. Nine through-holes 405 and projections 403 are formed at equal intervals, and the distance between the central axes of the through-holes 405 and projections 403 adjacent in the vertical and horizontal directions is 25 mm.

  The counter member was a stainless steel plate having a length of 80 mm, a width of 80 mm, and a thickness of 1 mm. Further, the press frit precursor to be sintered had the same shape as that shown in FIG.

  Then, after inserting the hole portion of the press frit precursor 105 into the convex portion 403 of the positioning member 401 and placing the press frit precursor 105 in the hole portion, the alumina plate material is put on the positioning member 301. A press frit was manufactured by placing in a heating furnace and sintering in the same manner as in Example 1.

  The shape characteristics and strength of the manufactured press frit were also measured in the same manner as in Example 1, and the results are shown in Table 4.

  From Table 4, about 9 samples, the outer diameter “maximum-minimum” was 0.03 to 0.09 mm, the inner diameter “maximum-minimum” was 0.01 to 0.04 mm, and the strength was 24 to 30 N. . Also in this example, it was possible to obtain a press frit with less shape deformation and improved strength.

(Embodiment 3)
This embodiment is an example in which the protrusions into which the holes of the press frit precursor are inserted are individually formed unlike the above-described embodiment.

(Example 5)
In this embodiment, the press frit precursor 105 shown in FIG. 3 placed on a plate material (not shown) is covered with a positioning member 501 shown in FIG. 9 and sintered to form a press frit.

  The positioning member 501 has a shape in which a cylinder having a diameter of 20 mm and a height of 5 mm and a cylinder having a diameter of 10 mm and a height of 5 mm (convex portions 502) are stacked on the same axis. The counter member was a plate made of alumina having a length of 80 mm and a width of 80 mm and a thickness of 1 mm, and the press frit precursor to be sintered had the same shape as that shown in FIG.

  Then, the convex portion 502 of the positioning member 501 is inserted into the hole portion 106 of the press frit precursor 105 arranged on the plate material, and the plate material and the top portion of the convex portion 502 are brought into contact with each other. A press frit was manufactured by sintering in the same manner as in Example 1.

  The shape characteristics and strength of the manufactured press frit were also measured in the same manner as in Example 1, and the results are shown in Table 5.

From Table 5, nine samples had an outer diameter “maximum-minimum” of 0.01 to 0.08 mm, an inner diameter “maximum-minimum” of 0.01 to 0.04 mm, and a strength of 24 to 30 N. . Also in this example, it was possible to obtain a press frit with less shape deformation and improved strength.
(Example 6)
This embodiment is an example in which the press frit precursor 105 shown in FIG. 3 is sintered into a press frit by a heating jig constituted by the positioning member 601 shown in FIG. 10 and the opposing member shown in FIG. .

  The positioning member 601 is a cylinder in which a cylinder with a diameter of 20 mm and a height of 10 mm and a cylinder with a diameter of 10 mm and a height of 5 mm (convex portion 602) are coaxially stacked. A cylinder with a height of 10 mm has a diameter of 15 mm and a height of A diaphragm portion 603 having a thickness of 3 mm is formed.

  The opposing member 203 was the same as that shown in FIG. Further, the press frit precursor 105 to be sintered has the same shape as that shown in FIG.

  Then, the press frit precursor 105 is put into the through hole 206 of the facing member 203, and the convex portion 602 of the positioning member 601 is put on the through hole 206 of the opposing member 203 so as to be inserted into the hole portion 106 of the press frit precursor 105, and As shown in FIG. 4, the outer side surface of the positioning member 601 and the inner side surface of the through hole 206 are fitted so that the horizontal shaking of the positioning member 601 is minimized. A gap is formed between the outer side surface of the positioning member 601 and the inner side surface of the through hole 206 so that gas generated at the time of vehicle decomposition removal and sintering can be removed.

  Next, the heating jig on which the press frit precursor 105 was set was placed in a heating furnace and sintered in the same manner as in Example 1 to produce a press frit. The shape characteristics and strength of the manufactured press frit were also measured in the same manner as in Example 1, and the results are shown in Table 6.

  From Table 6, for 9 samples, the “maximum-minimum” of the outer diameter was 0.01 to 0.09 mm, the “maximum-minimum” of the inner diameter was 0.01 to 0.04 mm, and the strength was 23 to 30 N. . Also in this example, it was possible to obtain a press frit with less shape deformation and improved strength.

  The modifications described in the above-described embodiments can be applied not only to the embodiments but also to other embodiments. Further, in the above-described embodiment, the press frit precursor in which the hole portion is formed is used. However, the height of the convex portion of the positioning member described in Embodiments 1 to 4 is reduced, and the hole portion of the opposing member is formed. If a gap is formed on the bottom surface of this, a similar effect can be obtained even with a press frit precursor having a recess.

  Further, in the above-described embodiments, the outer diameter shape and inner diameter shape of the press frit precursor are circular in a horizontal section, but are not limited to this, and may be an ellipse, a polygon, a curve and a straight line. The shape may be configured. When the press frit precursor has such a shape, it is preferable that the convex portion of the positioning member, the hole portion of the opposing member, and the like have similar shapes.

  The present invention is a heating jig capable of improving the strength without deforming the press frit from the press frit precursor. However, the strength is improved by re-sintering the press frit that is insufficiently sintered and insufficient in strength. It can also be used for improving purposes.

It is a conceptual diagram of the positioning member of one Example of this invention. It is a conceptual diagram of the opposing member of one Example of this invention. It is a conceptual diagram of a cylindrical press frit precursor. It is a conceptual diagram of the positioning member of the other Example of this invention. It is a conceptual diagram of the opposing member of the other Example of this invention. It is a conceptual diagram of a stepped cylindrical press frit precursor. It is a conceptual diagram of the positioning member of the other Example of this invention. It is a conceptual diagram of the positioning member of the other Example of this invention. It is a conceptual diagram of the positioning member of the other Example of this invention. It is a conceptual diagram of the positioning member of the other Example of this invention. It is a conceptual sectional view when the positioning member shown in FIG. 10 is set. It is a figure which shows the specific example of a press frit.

Explanation of symbols

  Positioning member: 101, 201, 301, 401, 501, 601 Opposing member: 103, 203, Press frit precursor: 105, 207

Claims (4)

  In a heating jig for use in heating a press frit precursor formed by pressing a glass powder and a vehicle to form granules and forming a recess or hole, a protrusion inserted into the recess or hole. A heating jig comprising a positioning member formed with a portion.   In a heating jig for use in heating a press frit precursor formed by pressing a glass powder and a vehicle to form granules and forming a recess or hole, a protrusion inserted into the recess or hole. A heating jig, comprising: a positioning member having a portion formed thereon; and a facing member used to face the positioning member.   The heating jig according to claim 1 or 2, wherein an outer shape of the convex portion is formed into a shape of a concave portion or a hole portion desired by the press frit after sintering.   The heating jig according to claim 1, wherein the positioning member is attached to each press frit precursor.

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