JPH09165228A - Production of bushing base plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a bushing base plate having stable bonding strength, suitable shape meeting the spinning condition and prolonged life by inserting a hollow pipe into a through-hole formed on a bushing base plate substrate, expanding the hollow pipe from inside and bonding the pipe to the substrate by thermal diffusion. SOLUTION: A circular or non-circular through-hole 3 is opened on a bushing base plate substrate 1. A hallow pipe 2 having an outer diameter equal to or smaller than the inner diameter of the through-hole 3 and an outer contour similar to the shape of the through-hole 3 is inserted into the through-hole and fixed to the hole by radially expanding the hollow pipe 2 from inside. The assembly is heated at a temperature higher than 500 deg.C and lower than the melting point of the material by 20 deg.C to effect the thermal diffusion and bond the hollow pipe 2 to the bushing base plate substrate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten glass filling box used for producing glass fibers or continuous glass filaments, or a bushing base plate having nozzle holes for bushings, and a method for producing the same.

[0002]

2. Description of the Related Art Several bushing base plates are currently used. Generally, a bushing base plate is used in which a blank plate of the bushing base plate is perforated, and a hollow tubular product which is previously processed into a pipe shape is inserted into the hole and joined by welding. Further, there is also used a bushing base plate or the like in which a material having a plate thickness thicker than the product dimension is compressed by a roll or a press to extrude the protrusions, and then the extruded portions of the protrusions are further punched by pressing. Recently, there has been a demand for fine denier glass fibers and it is necessary to make the pitch smaller so that a large number of holes can be formed within a certain area for efficient production, and a bushing base plate that satisfies these needs is required.

Conventionally, when a bushing base plate base plate is perforated, and a hollow tubular product which has been preliminarily processed into a pipe shape is inserted into the hole and welded, a bushing base plate base plate 1 as shown in FIG. The hollow tubular member 2 forming the discharge hole 10 is welded at its base end 2a by laser or plasma or resistance welding. In this case, the hollow tubular article 2 formed into a pipe shape had a thin wall thickness due to the spinning conditions of the glass fiber. When joining the base plate 1 of the bushing base plate to the pre-drilled portion, the base end portion 2a of the hollow tubular member 2 in FIG. 10, that is, the glass inlet side is welded.

In the case of welding due to the fact that the hollow tubular member 2 is thinner than the bushing base plate blank 1, the diameter of the discharge holes is small, the pitch is narrow, and the relationship between adjacent discharge holes is large, Since it is difficult to melt the entire thickness of the bushing base plate base plate 1, a method of welding a part of the upper layer portion of the base plate 1 is adopted as shown in FIG. Further, since this welding is partial, there is a drawback that it is difficult to process the shape of the discharge hole into a shape suitable for a preferable glass flow condition, that is, a spinning condition.

When the bushing base plate 4 manufactured as described above is continuously used at a high temperature for a long time, the bushing base plate 4 receives the pressure P of the glass 6 to generate creep strain, and the bushing base plate 4 is entirely deformed as shown in FIG. It deforms like a bulge with a bulge. FIG. 12 is an enlarged view of the mounting portion of the hollow tubular member 2, and creep strain occurs in the bushing base plate base plate 1 so that a gap is created between the hollow tubular member 2 and the hollow tubular member 2 and cracks 7 are formed in the upper welding portion. As a result, there is a problem that the glass liquid is leaked and the glass fiber cannot be spun. In a bad case, the hollow tubular article 2 may fall out.

The problem is that, in the glass fiber manufacturing process, expensive Pt alloy bushings all become unusable because only one discharge hole is cracked or dropped, and production has to be stopped. It is a fatal defect and has a great influence on the quality and cost of glass fiber. The problem is how to make it strong and to prevent cracks and falling off.

Recently, Japanese Patent Laid-Open No. 4-241105 has been proposed as a method for manufacturing bushings. This is an attempt to join a Pt alloy base plate using a Pt brazing material. In this case, in the case of a material such as a Pt-Au alloy or reinforced platinum that contains only a small amount of additional elements in Pt, that is, in the case of a material having a melting temperature equal to or lower than the melting temperature of Pt as a brazing material. Is P
It is considered difficult to melt Pt by using t as a brazing material.

As a method of solving the above problems, the present inventors have developed a method of press-fitting and fixing a hollow tubular member to a bushing base plate blank plate with a certain interference as shown in Japanese Patent Application Laid-Open No. 7-81968. . According to this method, the inner size of the hole provided in the bushing base plate blank is made slightly smaller than the outer size of the hollow tubular product, and the hollow tubular product is press-fitted and fixed. According to this method, since the hollow tubular article is joined over the entire surface of the bushing base plate that is in contact with the base sheet, good joining strength is exhibited. However, hole processing or hollow tubular article for providing a certain tightening margin is provided. There was a difficulty that machining took time. In particular, when the hollow tubular product has an irregular outer shape, such fine processing is extremely difficult, and a method for manufacturing a bushing base plate capable of obtaining the same effect by an easy method is desired.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a manufacturing method for easily manufacturing a bushing base plate having a stable joining strength and a shape suitable for spinning conditions and having a long life. The purpose is to do.

[0010]

A method for manufacturing a bushing base plate according to the present invention comprises forming a circular or irregular through hole in a bushing base plate base plate, and forming the through hole in the through hole with an inner size equal to or larger than the inner diameter of the through hole. With an outer dimension smaller than the inner dimension, insert an external hollow tubular object similar in shape to the through hole,
It is characterized in that the hollow tubular article is pushed from the inside to be fixed so as to have a certain tightening margin and fixed, and then the bushing base plate base plate and the hollow tubular article are joined by heat diffusion.

In still another method of manufacturing a bushing base plate of the present invention, a circular or irregular shape is formed at the center of the columnar protrusion at the same time as or after forming the outer shape circular or irregular columnar protrusion on the bushing base plate base plate. A through hole is provided, and a hollow tubular object having an outer shape equal to or smaller than the inner dimension of the through hole and having an outer shape similar to the through hole is inserted into the through hole, and a certain tightening allowance is provided. After expanding the hollow tubular object from the inside to secure it,
It is characterized in that the bushing base plate blank and the hollow tubular article are joined by heat diffusion.

Further, in the method for manufacturing a bushing base plate according to the present invention, the above-mentioned joined bushing base plate base plate and hollow tubular member, or the bushing base plate base plate, columnar protrusion and hollow tubular member are processed by plastic deformation, and the heat treatment is performed again. The diffusion is repeated.

Further, in some cases, the materials of the hollow tubular member and the bushing base plate are different from each other.

The thermal diffusion is performed at a temperature of 500 ° C. to 20 ° C. lower than the melting point of the material.

As described above, according to the method for manufacturing the bushing base plate of the present invention, the flat plate is perforated, and the through hole has an outer dimension equal to or smaller than the inner dimension of the through hole. After inserting the hollow tubular object with the above, it is pushed out from the inside of the hollow tubular object to fix it, and it is further diffused by heat to join, so the inner surface of the through hole on the bushing base plate base plate side and the outer peripheral portion of the hollow tubular object are The heat treatment is performed in a state of being pressed and fixed by the force of, and both metal materials are mutually diffused and bonded, and the strength thereof is the same as that of the base metal material.

Further, in the method for manufacturing the bushing base plate of the present invention, it is necessary to pay close attention to the dimensional accuracy because the outer diameter of the hollow tubular product used is only smaller than the hole provided in the bushing base plate base plate. In particular, in the case of a deformed hollow tubular product, machining is easy.

Further, when a columnar projection is provided subsequent to the through hole of the bushing base plate material, the hollow tubular material is inserted, pressure-bonded and thermally diffused, and then the periphery of the base of the hollow tubular material is covered with the bushing base plate raw material. Since it is reinforced, the strength of the bushing base plate against deformation is improved.

Further, not only a strong joining state can be obtained by performing plastic deformation processing after thermal diffusion and then repeating thermal diffusion again, but also the joining point which is a joining boundary surface recognized on the surface is a smooth surface. Become.

The term "plastic deformation" as used herein means not only the expansion of the inner diameter of the hollow tubular material for thermal diffusion, but also the introduction of glass as shown in the steps (a) to (d) of FIG. Taper to the side, molding of R, etc., molding of a convex portion on the outer peripheral portion of the hollow tubular article shown in FIG. 1 (d) to (e),
It means tapering to a hollow tubular product, other overall molding, finishing of internal dimensions, and the like.

The thermal diffusion temperature is limited to a temperature lower than 500 ° C. to 20 ° C. lower than the melting point of the material, because diffusion does not proceed below 500 ° C. and when the melting point of the material exceeds −20 ° C. This is because there is a limit to the range in which the temperature distribution can be controlled, the melting point of the material is partially exceeded, and the material melts.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for manufacturing a bushing base plate according to the present invention will be described with reference to FIG. The bushing base plate base plate 1 is provided with a through hole 3, and a hollow tubular member 2 having an outer size smaller than the inner size of the through hole 3 is shown in FIG.
Inserted as in (a). Then, the inside of the hollow tubular article was expanded in the radial direction, and then heat treatment was performed to diffuse the joint surface. As another embodiment, the glass inlet side of the bushing base plate, which has undergone the thermal diffusion of the joint surface, is further subjected to plastic deformation processing by pressing, as shown in FIGS. 1 (a) to 1 (b), and further to FIG. 1 (c). ) And heat treated again to ensure the joining of the joining surfaces.

In addition, the embodiment shown in FIG.
Although the bushing base plate shown in FIG. 1 (d) is further plastically deformed, a die having a cross section shown in FIG. 2 (a) as a press die on the glass outflow side, and a die shown in FIG. The bushing base plate blank is pressed around the base of the hollow tubular article 2 by pressing using a mold as shown in b), the hollow tubular article is tapered, and then the hollow tubular article is heat-treated again for diffusion. .

As another embodiment, as shown in FIG. 3 (a), a bushing base plate blank 1 is provided with a through hole 3 and at the same time a cylindrical projection 5 is provided, and then a hollow tubular article 2 is inserted to form a hollow tubular article. After the inner side of 2 was expanded in the radial direction, diffusion was caused by heat treatment to obtain a bushing base plate 4'shown in FIG. 3 (b).

[0024]

Embodiment 1 An embodiment of a bushing base plate and a manufacturing method thereof according to the present invention will be described with reference to the drawings. First, a bushing base plate material, Pt-Rh10% alloy, is rolled to a plate thickness of 1.5 mm with a rolling mill, and has a width of 50 mm and a length of 4 mm.
This was cut into 00 mm, and this blank plate 1 was pressed to form a through hole 3 of 400 holes having a circular cross section shown in FIG. The pore size at this time was 2.5 mm. The hollow tubular material 2 is Pt-A.
As shown in FIG. 5, an u5% alloy was drawn and cut into a pipe having a circular outer shape and inner shape, an outer dimension of 2.45 mm, an inner dimension of 1.95 mm and a total length of 6 mm. Then, as shown in FIG. 6, the hollow tubular article 2 was inserted into the through hole 3 provided in the base plate 1 of the bushing base plate, and thereafter, the hollow tubular article was plastically deformed in the direction of expanding from the inside and fixed. After that, heat treatment was performed at 1400 ° C. for 3 hours to heat-bond the bushing base plate base plate 1 and the hollow tubular article 2 to each other to manufacture a bushing base plate 4 shown in FIG. When the cross section of the obtained bushing base plate 4 was observed with a microscope, the bushing base plate base plate 1 and the hollow tubular article 2 were observed.
At the boundary of, both materials diffused due to thermal diffusion, and it was considered that the crystals were mixed and integrated, and sufficient metal bonding was performed.

[0025]

[Embodiment 2] The bushing base plate 4 as shown in FIG. 6 was obtained by the steps shown in Embodiment 1. The bushing base plate 4 is further plastically deformed by a press die shown in FIGS. 2 (a) and 2 (b), and then 1200
The bushing base plate blank 1 and the hollow tubular article 2 are further joined firmly by heat treatment at 6 ° C. for 6 hours,
A bushing base plate 4 ″ as shown in FIG. 7 was obtained. When the cross section of the obtained bushing base plate 4 ″ was observed with a microscope, the hollow tubular material 2 and the bushing base plate base plate 1 had the same structure, and no boundary was observed. It wasn't done, and it was joined more firmly.

[0026]

[Example 3] Bushing base plate Pt, which is a base plate material, was added with 0.3% of Zr, and an internally-oxidized oxide-dispersion-strengthened platinum plate was rolled to a plate thickness of 1.5 mm, with a width of 70 mm and a length of 600 mm.
This bushing base plate blank 1 cut into pieces was pressed to form cylindrical protrusions 5 having a circular cross section shown in FIG. At this time, the inner diameter of the through hole 3 was 2.4 mm, the height of the cylindrical protrusion 5 was 1.5 mm, and the plate thickness of the cylindrical protrusion 5 was 0.5 mm. The hollow tubular product 2 is made of an alloy of Pt-Zr 0.3% and has a circular shape with an outer dimension of 2.35 mm and an inner dimension of 1.85 mm and a length of 7 mm.
The pipe was manufactured by drawing and cutting.

Then, this hollow tubular article 2 is inserted into the through hole 3 provided in the bushing base plate base plate 1 described above, and is expanded from the inside of the hollow tubular article 2 in the direction of increasing the tube diameter, and as shown in FIG. The object 2 was fixed to the bushing base plate blank 1. After that, heat treatment was performed at 1400 ° C. for 12 hours, and the bushing base plate base plate 1 and the hollow tubular article 2 were subjected to thermal diffusion bonding to obtain a bushing base plate 4 ′. When the cross section of the obtained bushing base plate was observed with a microscope, both materials were diffused by thermal diffusion at the boundary between the bushing base plate blank 1 and the hollow tubular article 2,
It was considered that the crystals were intricate and integrated, and sufficient metal bonding was performed. Further, since the cylindrical projection 5 is joined to the periphery of the base of the hollow tubular article 2, it exhibits particularly strong resistance to bending deformation of the bushing base plate 4 '.

[0028]

[Prior art example] P which is a bushing base plate material
Roll the t-Rh10% alloy with a rolling mill to a plate thickness of 1.8 mm,
The base plate 1 was cut into a width of 100 mm and a length of 500 mm, and a through hole 3 having a diameter of 2.5 mm was provided in the blank 1 as shown in FIG. As shown in FIG. 5, the hollow tubular article 2 is made of an alloy of Pt-Rh10%,
The inner shape was circular, and the pipe was cut after drawing to make a pipe with an outer dimension of 2.45 mm, an inner dimension of 1.95 mm, and a length of 6 mm. Then, the hollow tubular article 2 is inserted into the hole provided in the bushing base plate base plate 1 described above, and the base end portion 2a thereof is inserted.
As shown in FIG. 10, laser welding was carried out to join them to obtain a bushing base plate 4. The bushing base plate 4 thus obtained was joined to the base end of the hollow tubular material.

[0029]

EFFECTS OF THE INVENTION The bushing base plate obtained by the above-mentioned Examples 1 to 3 and the conventional example is joined to a filter by arc welding to an upper box-shaped container constituting a terminal and a melting furnace to manufacture a bushing. When production was continued, defects such as falling out of the hollow tubular product occurred in the conventional example in the latter half year of use, but in the examples 1 to 3, 2
No problems occurred even when the glass fiber was continuously manufactured for a year.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a method for manufacturing a bushing base plate of the present invention.

FIG. 2 is a cross-sectional view of a press die used in an embodiment of a method for manufacturing a bushing base plate according to the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the method for manufacturing a bushing base plate of the present invention.

FIG. 4 is a diagram showing steps of an embodiment and a conventional example of a method for manufacturing a bushing base plate of the present invention.

FIG. 5 is a diagram showing steps of an embodiment and a conventional example of a method for manufacturing a bushing base plate of the present invention.

FIG. 6 is a diagram showing steps of an embodiment of a method for manufacturing a bushing base plate of the present invention.

FIG. 7 is a diagram showing steps of an embodiment of a method for manufacturing a bushing base plate of the present invention.

FIG. 8 is a diagram showing steps of an embodiment of a method for manufacturing a bushing base plate of the present invention.

FIG. 9 is a diagram showing steps of an embodiment of a method for manufacturing a bushing base plate of the present invention.

FIG. 10 is a sectional view of a main part of a conventional bushing base plate.

FIG. 11 is a cross-sectional view showing a state after using a bushing using a conventional bushing base plate.

FIG. 12 is a partially enlarged sectional view of FIG. 11.

[Explanation of symbols]

 1 Bushing base plate base plate 2 Hollow tubular material 3 Through hole 4, 4 ', 4 "Bushing base plate 5 Cylindrical protrusion 6 Glass 7 Crack 10 Discharge hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Suguro 26 Suzukawa, Isehara City, Kanagawa Prefecture Tanaka Kikinzoku Kogyo Co., Ltd. Isehara Factory

Claims (5)

[Claims] 1. A bushing base plate blank is provided with a circular or odd-shaped through hole, and the through hole has an outer dimension equal to or smaller than the inner dimension of the through hole, and is similar to the through hole. The feature is that after inserting the hollow tubular article of the outer shape of the above, the hollow tubular article is spread and fixed from the inside so as to have a certain interference, and then the bushing base plate raw plate and the hollow tubular article are joined by heat diffusion. Bushing base plate manufacturing method. 2. A circular or irregular through hole is provided in the center of the columnar projection at the same time as or after forming the external circular or irregular columnar projection on the bushing base plate blank, and the through hole is penetrated by the through hole. Insert a hollow tubular object that has an outer dimension that is equal to or smaller than the inner dimension of the hole and that is similar in shape to the through hole, and push the hollow tubular object from the inside so that the tightening margin is constant. A method for manufacturing a bushing base plate, which comprises spreading and fixing and then thermally diffusing to bond the bushing base plate blank and the hollow tubular product. 3. The bushing base plate element plate and the hollow tubular article, or the bushing base plate element plate, the columnar projection and the hollow tubular article, which are joined according to claim 1 or 2, are processed by plastic deformation, and thermal diffusion is repeated again. A method for manufacturing a bushing base plate, comprising: 4. The method for manufacturing a bushing base plate according to claim 1, wherein the hollow tubular material and the bushing base plate base plate are made of different materials. 5. The thermal diffusion is 500 ° C. to 20 ° C. from the melting point of the material.
The method is performed in the range of a temperature lower by ° C.
The method for manufacturing a bushing base plate according to 2, 3, or 4.