JP3186370B2 - Manufacturing method of bushing base plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a method for making a glass filled box or a bushing base plate having a bushing nozzle hole for use in producing glass fibers or continuous glass filaments.

[0002]

2. Description of the Related Art As a method of manufacturing a bushing base plate, several manufacturing methods are currently used. Generally, a method of manufacturing a bushing base plate has been widely used in which a raw plate of a bushing base plate is subjected to drilling, a hollow tubular member previously processed into a pipe shape is inserted into the hole, and joined by welding. Also, there is a method of manufacturing a bushing base plate by compressing a material having a thickness greater than the product size by a roll or a press to extrude protrusions, and thereafter performing a punching process on the extruded portions by a press. Used. In recent years, there has been a demand for fine denier glass fibers, and it has been necessary to make the pitch smaller to increase the number of holes in a certain area for efficient production, and a method of manufacturing a base plate that satisfies these needs has been demanded.

[0003] The present inventors have a new manufacturing method that improves the problem of manufacturing method used these prior already filed (Japanese Patent Application No. 4-84515) which the present invention is further <br/> improvements thereto It is an improvement. Conventionally, when performing boring processing on the bushing base plate base plate, and inserting and welding a hollow tubular object previously processed into a pipe into the hole,
Laser or a hollow tubing 3 at its proximal end portion 3a constituting the material plate 1 and the discharge hole 2 of the bushing base plate as shown in FIG. 9, etc. welding or resistance welding by plasma or the like is performed.

[0004] In this case, the hollow tubular article 3 formed into a pipe shape is finished to be thin in view of the spinning conditions of the glass fiber. In joining the bushing base plate to a portion pre-perforated on the base plate 1, the base end 3a of the hollow tubular member 3 in FIG. 9, that is, the glass inlet side is welded.

[0005] The thickness of the hollow tubular member 3 is smaller than the thickness of the base plate 1 of the bushing base plate.
In the case of welding, it is difficult to melt the entire thickness of the base plate 1 of the bushing base plate because the diameter of the base plate 1 is small. Therefore, a method of welding a part of the upper layer of the base plate 1 as shown in FIG. Have been.

When the bushing base plate 4 manufactured as described above is used at a high temperature for a long time, the bushing base plate 4 receives a pressure P of the glass 5 to cause creep strain, and the bushing base plate 4 is entirely as shown in FIG. Are overhanging to have a bulge.

FIG. 11 is an enlarged view of the mounting portion of the hollow tubular article 3.
When the bushing base plate 1 undergoes creep deformation, a gap is formed between the bushing base plate 1 and the hollow tubular article 3 and a crack 6 is formed in the upper welded portion, thereby causing a leakage of the glass liquid. There is a problem that the spinning of the glass fiber becomes impossible.
Further, in a severe case, the hollow tubular article 3 may fall off.

[0008] This problem is caused by the fact that the expensive Pt-alloy bushing must be discontinued in a glass fiber manufacturing process because only one discharge hole is cracked or dropped and all the parts become unusable. Therefore, it is a fatal defect and greatly affects the quality and cost of glass fiber. The problem is how to make the molding strong and less likely to crack or fall off.

Recently, Japanese Patent Application Laid-Open No. 4-241105 has been proposed as a bushing manufacturing method. This is intended to be joined to a Pt alloy base plate using a Pt brazing material. In this case, in the case of such Pt-Au alloy or reinforced platinum does not include only additional element Mr or a Pt material, that is, when the material having the same or lower melt temperature and the melting temperature of Pt as the brazing material It is considered difficult to melt Pt using Pt as a brazing material.

[0010]

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

[0011]

The method of manufacturing a bushing base plate according to the present invention, which solves the above-mentioned problems, comprises the steps of first rolling a bushing base plate material to a thickness of a product, forming the material into a flat bushing base plate blank, and It is characterized by forming a right circular cylindrical hole with the number of holes, press-fitting and fixing a right cylindrical hollow tubular object into the hole with a fixed interference, and then joining by heat diffusion. is there.

At the same time as or after the projection is formed on the base plate of the bushing base plate, a straight cylindrical hole is provided at the center of the projection, and a straight cylindrical hollow tubular object is inserted into the hole with a fixed interference. It is characterized in that after being press-fitted and fixed, it is thermally diffused and joined. In some cases,
A plastic deformation process is applied to the hollow tubular article and the projections joined as described above, and the hollow tubular article is formed into a predetermined shape and finished, and the hollow tubular article used here is made of a material different from the bushing base plate material. Is what you do.

[0013] On the other hand, the hollow cylindrical article in the shape of a right column is formed by pipe or extrusion, pressing, or the like so that it conforms to the specified dimensions of the product in advance. Its outer diameter has a shape that is convenient to be inserted into the hole with a fixed interference. This is press-fitted and fixed in the hole and thermally diffused by heat treatment to join.

[0014]

SUMMARY OF According to the manufacturing method of the bushing base plate of the present invention as described above, subjected to a straight cylindrical holes worked into a flat plate shape, a straight cylindrical hollow tubing for constituting the discharge hole to the hole Are fixed by press-fitting with a fixed interference, and heat diffusion bonding is performed by heat treatment.Therefore, the hole on the bushing base plate side and the outer peripheral portion of the hollow tubular article are heat-treated in a pressed state fixed and fixed by a fixed interference. The metal materials diffuse and bond with each other, and the strength is the same as that of the base metal material. Here, the constant tightening margin, refers to the order to life time difference the pressing force after the press-fitting fixation by the difference between the outer diameter of the inner diameter of the hollow tube of the opening.

In order for the portion to be joined to be properly joined over the entire area in this manner, air must be interposed between the hole on the base plate side of the bushing base plate to be joined and the outer peripheral portion of the hollow tubular member. By press-fitting and fixing without intervening other gases or foreign substances, heat diffusion is performed over the entire area to be joined, and as a result, joining strength exactly equivalent to the material strength of the base material can be obtained. Even if the bushing base plate is deformed during prolonged use as in the prior art, there is no fear of cracks or defects. The spinning temperature of glass fiber is 1100 ° C ~ 14
Since the heat treatment is performed at a temperature of 00 ° C., thermal diffusion further proceeds during use, and there is no concern about a decrease in bonding strength.

Further, when the thickness of the discharge hole is required to be small, such as in the case of thin glass fiber, the strength of the pipe itself is low, and the base of the bushing base plate material and the pipe is formed at a right angle. When there is intersecting, there is a concern that the portion is broken due to the weight and spinning force of the glass. Therefore, when it is necessary to reinforce the base portion, project the bushing base plate base plate, provide a hole in the center, and press-fit and fix a hollow tubular material, that is, a thin-walled pipe into the hole. Accordingly, the joint base between the bushing base plate base plate and the pipe constituting the discharge hole is guarded by the projection, so that there is no fear of breakage at this joint.

[0017] The case where it can be completed only by joining in this way, the case in which the shape of the introduction hole side into which glass flows in is further formed by plastic working after joining, and the straight length and shape of a projection or a hollow tubular object. Has an effect of further strengthening the joint portion in shape. Further, a hollow tubular material having a different material, that is, Pt or Pt is used to improve the wetting at the time of discharge.
A material obtained by alloying Au with a t alloy can also be used. This does not reduce the strength.

[0018]

Embodiment 1 An embodiment of a bushing base plate manufacturing method of the present invention will be described with reference to the drawings. First, an alloy of Pt-Rh10%, which is a bushing base plate material, was rolled to a thickness of 1.5 mm with a rolling mill, and the bushing base plate blank 1 cut into a width of 100 mm and a length of 500 mm was pressed into 800 holes. Holes 2 shown in FIG. 1 were formed in a staggered arrangement at a pitch of 3.5 mm. At this time, the through hole of the bushing base plate had a diameter of 1.9 mm.

The hollow tubular member 3 has an outer diameter as shown in FIG.
It is processed by drawing to 2.0mm, inner diameter 1.5mm, wall thickness 0.25mm, height 6.5mm, cut and molded. The hollow tubular member 3 is inserted into the hole 2 provided in the base plate 1 of the bushing base plate in accordance with the size of the hole 2.
A 0.2 mm larger die (not shown) is placed 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 by a press with a tightening margin of 05 mm, and was thermally diffused in an electrolytic furnace at 1400 ° C. for 5 hours. As shown in FIG. 3, in the cross section after the heat treatment, at the fixing portion, the crystal on the side of the hole 2 of the bushing base plate 1 and the crystal on the outer peripheral side of the hollow tubular article 3 diffused mutually, and the growth of the crystal over the joint boundary was recognized. It was confirmed that the metal material was completely the same, and that the joining was completed over the entire area. The bushing base plate thus formed was further joined to a terminal and an upper box-shaped container constituting a melting furnace by an arc welding to produce a bushing.

[0020]

Embodiment 2 When forming a bushing base plate using the above-described manufacturing process, a projection 4 having the shape shown in FIG. 4 is formed by pressing a bushing base plate base plate, and a hole 2 is formed at the center thereof. The diameter of this hole is 1.9m
m and the length of the hole were 3 mm. The hollow tubular article 3 has an outer diameter of 2.0 mm,
A bushing plate having a cross section as shown in FIG. 5 was manufactured in the same manufacturing process as in the above manufacturing method, using the dimensions of an inner diameter of 1.5 mm and a wall thickness of 0.25 mm, with a tightening margin of 0.05 mm in hole 2.

[0021]

Embodiment 3 In the manufacturing method of Embodiments 1 and 2, thermal diffusion is performed in an electric furnace at 1400 ° C. for 5 hours, and then, the molding is performed by using a punch and a die having a taper by a press. Then, a taper of 30 ° C. was formed, and the outlet side was formed so as to have a two-stage taper as shown in FIG. 6, thereby producing a bushing plate similar to the above-described embodiment. In addition, although the forming process of the shape shown in FIGS. 7 and 8 was also performed, the shape and the joining state were good.

[0022]

Example 4 In the same manufacturing process as in Example 3, the same processing was performed using a hollow tubular material, that is, an alloy containing 95% of Pt and 5% of Au for the material of the discharge hole. The reason for adding 5% of Au is to improve the wettability during spinning.
A good effect was obtained for the bonding because of the high diffusion rate of Au and the like.

[0023]

As can be seen from the above description, according to the bushing base plate manufacturing method of the present invention, a porous bushing base plate having a small diameter and a narrow pitch can be manufactured with a stable strength and a long life. .
In other words, it is possible to easily machine dense holes with a thin nozzle and a narrow pitch without the need for skill.Also, there are no gaps or voids at the joints, and the strength is equal to that of the base material platinum alloy material. It has the same strength to withstand long-term use, and can be made of a material that does not easily wet the tip of the tip. A glass fiber spinning apparatus capable of spinning can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an opening 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 one embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a joint state between an opening and a hollow tubular object 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 joint state between the protrusion and the hollow tubular object according to one embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state where FIG.

FIG. 7 is a diagram showing a joint state between an opening and a hollow tubular object according to another embodiment of the present invention.

FIG. 8 is a view showing a joint state between a protrusion and a hollow tubular object according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a conventional joint state between an opening and a hollow tubular object.

FIG. 10 is a 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 formed at a joint between a conventional opening and a hollow tubular object.

────────────────────────────────────────────────── ─── Continuation of the front page Examiner Michichi Chino (56) References JP-A-58-76512 (JP, A) JP-A-51-99107 (JP, A) JP-A-60-240449 (JP, A) JP-A-63-299876 (JP, A) JP-A-63-40776 (JP, A) JP-A-62-227585 (JP, A) JP-A-7-187702 (JP, A) (JP, U) JP-B 45-2329 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) C03B 37/083 B23K 20/00 310 B23P 11/02 B21D 39/00

Claims (4)

(57) [Claims] 1. A straight circle is formed on a base plate of a bushing base plate.
A method for manufacturing a bushing base plate, comprising: forming a column-shaped hole; press-fitting and fixing a right cylindrical hollow tubular member into the hole with a fixed interference; 2. At the same time as or after the projection is formed on the base plate of the bushing base plate, a straight cylindrical hole is made in the center of the projection, and a straight cylindrical hollow tubular object is fixed to the hole at a predetermined interference. A method of manufacturing a bushing base plate, wherein the bushing base plate is bonded by being thermally diffused after being press-fitted. 3. A method for manufacturing a bushing base plate, wherein the right cylindrical hollow tubular article and the projections joined by the steps 1 and 2 are formed by plastic deformation processing. 4. The method for manufacturing a bushing base plate according to claim 1, wherein the right cylindrical hollow tubular article is made of a material different from that of a base plate of the bushing base plate.