JPH0781968A - Production of bushing base plate - Google Patents

Abstract

PURPOSE:To provide the bushing plate having stable joint strength and long life by forming a circular hole in a blank plate of the bushing plate, and press fitting and fixing a hollow tubular material into this hole at specified interference, then joining both by thermal diffusion. CONSTITUTION:The flat plate is subjected drilling and the hollow tubular material for constituting a discharge port is press fitted and fixed at the specified interference into this hole. Since both are thermally diffusion joined by a heat treatment, the outer peripheral parts of the hole on the bushing plate side and the hollow tubular material are heat treated in the state of fixing and pressing these parts with the specified interference. Both metallic materials are thus diffused and joined to each other and the strength thereof is the same as the strength of the base metallic materials. Since the spinning of a glass fiber is executed at 1100 to 1400 deg.C, there is no worry at all about the degradation in the joint strength as the thermal diffusion progresses further during the use. The blank plate is subjected to projecting and the hollow tubular material is press fitted and fixed to the central part thereof if the discharge hole for the fine glass fibers having a small thickness size is required.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for making glass fiber or a molten glass filled box used to produce continuous glass filaments or bushing baseplates having bushing nozzle holes.

[0002]

2. Description of the Related Art As a method of manufacturing a bushing base plate, there are currently several manufacturing methods. In general, a method of manufacturing a bushing base plate is generally used in which a blank plate of the bushing base plate is perforated, a hollow tubular product that is preliminarily processed into a pipe shape is inserted into the hole and joined by welding. There is also a method of manufacturing a bushing base plate by compressing a material thicker than the product size with a roll or a press to extrude the protrusions, and then punching the extruded protrusions with a press. It is used. Recently, there has been a demand for fine denier glass fibers, and it is necessary to make the pitch smaller to make a large number of holes within a certain area for efficient production, and a method for manufacturing a base plate is required to satisfy these requirements.

The inventors of the present invention have already applied for a new manufacturing method that solves the problems of these conventionally used manufacturing methods (Japanese Patent Application No. 4-84515), but the present invention further satisfies and improves it. It is a thing. Conventionally, when a bushing base plate base plate is perforated, and a hollow tubular product which has been previously processed into a pipe shape is inserted into the hole and welded, as shown in FIG. 9, the bushing base plate base plate 1 is used.
The hollow tubular member 3 formed by the discharge hole 2 and the base end portion 3a are welded by laser, plasma, or the like, or resistance welded.

In this case, the hollow tubular article 3 formed in the shape of a pipe had a thin wall due to the spinning conditions of the glass fiber. When joining the base plate 1 of the bushing base plate to a pre-drilled portion, the base end portion 3a of the hollow tubular member 3 of FIG. 9, that is, the glass inlet side is welded.

The thickness of the hollow tubular member 3 is smaller than that of the base plate 1 of the bushing base plate, and the discharge hole 2
Since it is difficult to melt the entire thickness of the base plate 1 of the bushing base plate in the case of welding because the diameter of the base plate is small, a method of welding a part of the upper layer portion of the base plate 1 as shown in FIG. 9 is used. Has been.

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 5 to generate creep strain, and the bushing base plate 4 is entirely deformed as shown in FIG. Deforms into an overhanging shape with a bulge.

FIG. 11 is an enlarged view of the mounting portion of the hollow tubular article 3.
As a result of creep deformation of the bushing base plate base plate 1, a gap is formed between the bushing base plate base plate 1 and the hollow tubular member 3 and a crack 6 is generated at the upper welded portion, which causes the glass liquid to leak. However, there was a problem that the spinning of glass fiber could not be performed.
Further, in a terrible case, the hollow tubular object 3 may fall out.

This problem is caused by the fact that the expensive Pt-alloy bushing in the glass fiber manufacturing process becomes unusable because only one discharge hole is cracked or dropped, and the production must be stopped. Therefore, it is a fatal defect and has a great influence on the quality and cost of glass fiber. The problem is how to make the molding so strong that cracks and falling do not easily occur.

Recently, Japanese Patent Application 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 Pt-Au alloy or a material that does not contain Pt with a small amount of additive element in reinforced platinum, 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, It is considered difficult to melt Pt by using Pt as a brazing material.

[0010]

An object of the present invention is to provide a method for manufacturing a bushing plate having stable joint strength and long life.

[0011]

A method of manufacturing a bushing base plate according to the present invention which solves the above-mentioned problems is required after first rolling a bushing base plate material into a plate thickness of a product and forming a flat plate of the bushing base plate. It is characterized in that a circular hole having the number of holes is formed, a hollow tubular article is press-fitted and fixed in the hole with a constant interference, and then heat diffusion is carried out to join.

Simultaneously with or after the projection is formed on the plain plate of the bushing base plate, a hole is provided at the center of the projection, and a hollow tubular article is press-fitted and fixed in the hole with a certain interference, and then the heat is diffused. It is characterized by joining. Further, in some cases, the hollow tubular article and the projections joined by the above are subjected to plastic deformation processing and finished by molding into a predetermined shape dimension, and the hollow tubular article used here is made of a material different from the bushing base plate material. It is characterized by doing.

On the other hand, the hollow tubular product is a pipe or a product which has been previously processed by extrusion, pressing or the like so as to match the specified size of the product, and may be processed to a size slightly in front of it, and its outer diameter is It has a shape convenient for being inserted into the above-mentioned hole with a constant interference. This is press-fitted and fixed in the hole and thermally diffused and joined by heat treatment.

[0014]

As described above, according to the method for manufacturing a bushing base plate of the present invention, a flat plate-shaped hole is formed, and a hollow tubular member for forming a discharge hole is press-fitted and fixed in the hole with a certain interference. However, since the heat diffusion bonding is performed by heat treatment, the outer periphery of the hole on the bushing base plate side and the hollow tubular member is heat treated in a pressed state in which it is fixed with a certain interference, and both metal materials diffuse into each other. Join,
Its strength is the same as that of the base metal material. here,
The constant tightening margin is for making a pressing force after press-fitting and fixing due to the difference between the inner diameter of the opening and the outer diameter of the hollow tubular article.

In order for the portion to be joined in this manner to be joined properly over the entire area, air must be provided between the hole on the bushing base plate blank side to be joined and the outer peripheral portion of the hollow tubular object. , The heat is diffused to the whole area of the part to be joined by press-fitting and fixing without interposing other gas or foreign substance, and thereby the joining strength which is exactly equal to the material strength of the base material is obtained. Even if the bushing base plate is deformed during long-time use as in the conventional case, there is no fear of cracks or defects. The spinning temperature of glass fiber is 1100 ℃ ～ 14
Since it is carried out at a temperature of 00 ° C, there is no fear of deterioration of the bonding strength because heat diffusion further progresses during use.

Furthermore, when the discharge hole is thin, such as in the case of thin glass fiber, the strength of the pipe itself is low, and the root portion where the material of the bushing base plate and the pipe are joined is a right angle. If it intersects, there is a concern that the place may break due to the weight of the glass and the spinning force. Therefore, when it is necessary to reinforce the root part of the bushing base plate, make a projection on the base plate of the bushing, provide a hole in the center of the plate, and press fit and fix a hollow tubular object, that is, a thin pipe. As a result, the root of the joint between the bushing base plate base plate and the pipe forming the discharge hole is guarded by the projection, so that there is no fear of breakage at this joint.

In the case where it can be completed only by joining in this way, the case of forming the shape of the introduction hole side into which the glass flows in by further performing plastic working after joining, the straight length and shape of the protrusion or the hollow tubular object Is changed by plastic working, which has the effect of further strengthening the above-mentioned joined portion in terms of shape. Further, in order to improve the wettability at the time of discharging, the hollow tubular material made of a different material, that is, the material of the discharging hole is made of Pt or P.
It is also possible to use a material obtained by alloying Au with the t alloy. It does not reduce the strength.

[0018]

Embodiment 1 An embodiment of a method for manufacturing a bushing base plate of the present invention will be described with reference to the drawings. First, a bushing base plate material, Pt-Rh 10% alloy, was rolled by a rolling mill to a plate thickness of 1.5 mm, and the bushing base plate blank 1 cut into a width of 100 mm and a length of 500 mm was pressed to form 800 holes, The holes 2 shown in FIG. 1 were formed in a staggered arrangement with a pitch of 3.5 mm. At this time, the bushing base plate had a hole size of 1.9 mm in diameter.

The hollow tubular member 3 has an outer diameter as shown in FIG.
It was formed by drawing, cutting, and cutting so that the inner diameter was 2.0 mm, the inner diameter was 1.5 mm, the wall thickness was 0.25 mm, and the height was 6.5 mm. Then, the hollow tubular member 3 is inserted into the hole 2 provided in the base plate 1 of the bushing base plate described above according to the size of the hole 2.
A die (not shown) having a size of 0.2 mm is installed on the lower side, and a punch having the same size as the outer diameter of the hollow tubular article 3 is used as the upper die.
It was press-fitted and fixed with a 05 mm interference press and subjected to thermal diffusion in an electrolysis furnace at 1400 ° C for 5 hours. As shown in FIG. 3, in the cross section after the heat treatment, the growth of crystals was observed at the fixing point, where the crystals on the hole 2 side of the bushing base plate 1 and on the outer peripheral side of the hollow tubular member 3 diffused to each other and crossed over the bonding boundary. It was confirmed that they were made of the same metal material and that the joining was completed over the entire area. The bushing base plate molded in this manner was further arc-welded to an upper box-shaped container constituting a terminal and a melting furnace to join a filter to manufacture a bushing.

[0020]

[Embodiment 2] When the bushing base plate is formed using the above-described manufacturing process, the bushing base plate base plate is pressed to form a protrusion 4 having the shape shown in FIG. 4, and a hole 2 is formed in the center thereof. The diameter of this hole is 1.9m
m, and the hole length was 30 mm. Hollow tubular object 3 has an outer diameter of 2.0 m
m, inner diameter 1.5 mm, wall thickness 0.25 mm and hole 2 0.05 mm
The bushing plate having a cross section as shown in FIG.

[0021]

[Embodiment 3] In the manufacturing method of Embodiments 1 and 2, heat diffusion is performed in an electric furnace at 1400 ° C. for 5 hours, and thereafter, press molding is performed using a tapered punch and a die, and a glass introduction side. A bushing plate similar to that of the above-mentioned embodiment was manufactured by forming a taper at 30 ° C. and forming the outlet side in two steps as shown in FIG. In addition, the molding process of the shapes shown in FIGS. 7 and 8 was also performed, but the shapes and the joined states were good.

[0022]

Fourth Embodiment In the same manufacturing process as in the third embodiment, the same processing is performed using a hollow tubular material, that is, an alloy containing 95% Pt and 5% Au as the material of the discharge holes. The reason for adding 5% Au is to improve the wettability during spinning,
The high diffusion rate of Au also brought about a good effect on bonding.

[0023]

As can be seen from the above description, according to the method of manufacturing a bushing base plate of the present invention, it is possible to manufacture a bushing having a small diameter and a narrow pitch, and having a stable strength and a long life. .
That is, it is possible to easily machine dense holes with a thin nozzle and a narrow pitch, without the need for skill, and to use a platinum alloy material that has no gaps or cavities at the joints and is a base material with strength. Stable by obtaining a structure that can withstand long-term use due to having exactly the same strength, and that it is possible to use a material that does not easily wet the tip end part, so that thread breakage during spinning that occurs at the center of the dense hole does not easily occur It is possible to obtain a glass fiber spinning device capable of spinning.

[Brief description of drawings]

FIG. 1 is a sectional view showing an opening portion of a bushing plate material according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a hollow tubular article according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a joined state of an open hole portion and a hollow tubular article in one embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a protrusion in one embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a joined state of the protrusion and the hollow tubular article in the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state in which FIG. 5 is further processed.

FIG. 7 is a view showing a joined state of an open hole portion and a hollow tubular article in another embodiment of the present invention.

FIG. 8 is a view showing a joined state of a protrusion and a hollow tubular article in another embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a joined state of a conventional open hole portion and a hollow tubular article.

FIG. 10 is a cross-sectional view showing a modified state of a conventional bushing plate.

FIG. 11 is a cross-sectional view showing a state in which a gap is created at a joint between a conventional aperture and a hollow tubular article.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Toshio Honma 26 Suzukawa, Isehara City, Kanagawa Prefecture Tanaka Kikinzoku Kogyo Co., Ltd. Isehara Factory

Claims (4)

[Claims] 1. A method for manufacturing a bushing base plate, characterized in that a circular hole is formed in a blank of the bushing base plate, a hollow tubular material is press-fitted and fixed in the hole at a constant interference, and then heat diffusion is performed to join the hollow tubular object. . 2. A bush is formed at the same time as or after forming the projection on the base plate of the bushing base plate, a hole is made in the central portion of the projection, and a hollow tubular article is press-fitted and fixed in the hole with a fixed interference, and then heat diffusion is performed. A method for manufacturing a bushing base plate, which is characterized in that the two are joined together. 3. A method for manufacturing a bushing base plate, characterized in that the hollow tubular article and the protrusions joined according to claims 1 and 2 are formed by plastic deformation processing. 4. The method for manufacturing a bushing base plate according to claim 1, wherein the hollow tubular material is made of a material different from that of the blank of the bushing base plate.