JPS6077142A - Preparation of pushing plate - Google Patents

Abstract

PURPOSE:To prepare simply a pushing plate having nozzles with high dimensional accuracy, by arranging a great number of bored holes on a material, cutting and processing the peripheries of the holes to form plural lines of protrusions, discharging and processing the peripheries of the holes. CONSTITUTION:The pushing plate material 1 is subjected to drilling processing and cutting meaning processing, so that a great number of the bored nozzle holes 8' are arranged. The peripheries of the parts having a great number of the nozzle holes 8' on the surface of the material 1 are cut and processed in such a way that plural lines of the protrusions 11 are formed. The peripheries of the nozzle holes 8' of the parts of the protrusions 11 wherein a great number of the nozzle holes 8' of the material 1 are positioned are discharged and processed to parts close to the ends of the protrusions 11 by the electrode 12 having the dents or holes matching the shape of nozzle, the external shapes of the nozzles are formed, and the nozzles 9' are formed, to give the pushing plate 10 capable of extruding and spinning glass fiber having uniform quality by the nozzles 9'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for making a base plate, a so-called bushing plate, with nozzle holes of a molten glass filled box or bushing used for producing glass fibers or continuous glass filaments.

Conventionally, in order to manufacture a bushing plate, first, as shown in FIG. 5, and form plate 3.
A part of the bushing plate material 1 is pushed into the hole 2 by plastic deformation to form a protrusion 6, and the parts of the bushing plate +4 material 1 other than the protrusion 6 are made thinner. Next, as shown in Figure 1, the protrusions 6 of the bushing plates B and I
The bushing plate 10 was made by punching a punch 7 from the back side of the plate and drilling a nozzle hole 8 to form a nozzle 9.

However, the manufacturing method of such bushing play 1.
There are the following problems.

(1) During the pressing process using the forging hammer 4 or rolling process using the roll 5 shown in FIG. 1a, the material 1 flows as shown by the arrow as shown in FIG. 2a, and the center of the projection 6 shifts from the hole 2. When the nozzle 8 is formed by punching the inside of the punch 7 and forming the nozzle 9, the thickness of the nozzle 9 becomes uneven as shown in FIG. Therefore, if such a nozzle 9 is used to prevent the glass fiber from being ejected, the glass fiber may be cut midway or the thickness may vary, resulting in a loss of quality.

(2) A shear stress S is generated at the base of the protrusion 6 formed on the material 1 by pressing or rolling, as shown in FIG. 2a,
This remains when the nozzle hole 8 is drilled by driving the bunch 7, so when exposed to the high temperature state of glass melting,
This will cause cranking and significantly shorten the service life.

(3) When the nozzle hole 8 is bored by driving the bunch 7, cracks may occur in the nozzle 9 due to plastic deformation and tensile stress.

(4) It is extremely difficult to make a small diameter nozzle 9 (diameter 1.5 fi or less) because the bunch 7 will break.

(5) If the pitch of the nozzles 9 is made small, the wall thickness between the nozzles 9 of the template 3 becomes thin, and if the thickness becomes less than 0.5, it will break, so the pitch of the nozzles 9 cannot be made too small.

(6) Nozzle brake (nosing brake pressed by a forging hammer) 10 has uneven thickness, so when energized as a heating element, the temperature distribution will not be uniform, so each nozzle 9
This causes a difference in the viscosity of the molten glass discharged, resulting in uneven quality of the obtained glass fibers, etc.

(7) Since the height of the nozzle 9 is not constant, it is necessary to cut it later, but it is extremely difficult to cut it so that the height is constant.

The present invention has been made to solve such problems,
The nozzle wall thickness can be made uniform, no cracks or cracks will occur in the nozzle, and even small diameter nozzles and small pitch nozzles can be easily formed.Furthermore, the nozzle can be made with uniform thickness and a uniform nozzle height. - The purpose is to provide a method for manufacturing a nosing plate.

As shown in FIG. 3a, the method for manufacturing a bushing plate of the present invention involves forming a large number of nozzle holes 8 in a bushing plate material 1 by drilling (rough nozzle inner surface processing) and cutting and reaming processing (nozzle inner surface finishing processing). ', and as shown in FIG.
After cutting the periphery of the bushing plate material 1 in order from one side to the other, as shown in FIG. The outer shape of the nozzle is formed by electrical discharge machining around each nozzle hole 8' to near the base end of the convex strip 11 using an electrode 12 having a recess or hole that matches the nozzle shape.
The bushing plate 10' is made by forming the bushing plate 10'.

As described above, in the bushing plate manufacturing method of the present invention, there is no need to press or roll the bushing plate material 1, and there is no need to drive bunches into the bushing plate material 1, allowing for drilling, cutting, reaming, etc. Since the nozzle hole 8' is bored by the nozzle hole 8', the material 1 is not plastically deformed and no shear stress or tensile stress is generated. Therefore, no cracks or cracks occur in the nozzle 9'.

Furthermore, since the nozzle hole 8' is formed by drilling and cutting and reaming, even a small diameter nozzle hole 8' can be easily obtained, and the thickness of the bushing plate material 1 can be changed by forming the nozzle hole 8'. Since there is no hole, even nozzle holes 8' with a small pitch can be easily formed. Furthermore, nozzle hole 8'
The outer shape of the nozzle is formed by electric discharge machining to near the base end of the protrusion 11 using the electrode 12 having a recess or hole that matches the nozzle shape, so that the nozzle 9' is formed.
There is no unevenness in the wall thickness. Therefore, when glass fiber is discharged and spun from this nozzle 9', there is no possibility of it being cut midway or having variations in thickness.
, products with high dimensional accuracy can be obtained. In addition, since the parts of the bushing plate 10' other than the nozzles 9' are cut to a certain thickness, when electricity is applied as a heating element, the temperature distribution is uniform, and the molten glass discharged from each nozzle 9' is heated. The viscosity becomes constant, and the quality of the obtained glass fiber etc. becomes uniform. Furthermore, the nozzle hole 8' of the nozzle 9' is drilled by drilling and cutting and reaming, and the nozzle outer shape is formed by electric discharge machining and has not been plastically deformed at all, so its height is the same as that of the original bushing plate material l. The thickness remains constant.

Next, in order to clarify the effects of the bushing plate manufacturing method of the present invention, specific examples and conventional examples will be described.

[Example 1] As shown in Fig. 3a, a bushing plate material 1 made of platinum-rhodium alloy with a width of 100 m, a length of 400 tm, and a thickness of 8 mm was subjected to drilling (rough processing of the inner surface of the nozzle) and cutting and reaming. (nozzle internal finishing process) and tip inner diameter 1
．． 8m nozzle hole 8' with base end inner diameter 4N, 4.6 Tsuru pinch, 6.5 lengthwise, 5 widthwise 41r! A total of 260 holes were drilled, and then, as shown in FIG.
Dragon, 300m long.

The periphery of the protruding strips 11 is cut to form four rows of protrusions 11 with a height of 6 cranes, and then, as shown in FIG.
The inner diameter of the tip is 4.5 inches around each nozzle hole 8',
Using a copper electrode 12 having an inner diameter of 2 mm at the base end and 65 recesses with a taper angle of 9 degrees, three stages of electrical discharge machining (rough, medium, and finishing) were performed to the vicinity of the base end of the protrusion 11, and the outer diameter of the tip was 2.5 m. A nozzle outer shape with a base end outer diameter of 4.5 mm and a height of 6 mm was molded to form a nozzle 9', and a bushing plate 10' was obtained.

[Example 2] As shown in Fig. 4a, a large number of nozzle holes 8' to be drilled later in the surface of a bushing plate material 1 made of platinum-rhodium-zirconium oxide with a width of 100 mm, a length of 4000 mm, and a thickness of 8 mm. The width of the part where it is located is 5 dragons.

The circumference was cut to form four rows of protrusions 11 with a length of 300 m and a height of 6.5 m, and then the parts of each protrusion 11 of the bushing plate material 1 were cut as shown in Figure 4. By drilling (rough processing of the inner surface of the nozzle) and cutting and reaming (finishing of the inner surface of the nozzle), 65 nozzle holes 8' each with an inner diameter of 1.3 mm at the tip and an inner diameter of 41 mm at the base end were formed at a pitch of 4.6 days. A total of 260 rows were drilled, and then, as shown in FIG. 4C, the periphery of each nozzle hole 8' in the portion of the protruding strip 11 where the many nozzle holes 8' of the bushing plate material 1 are located was drilled with an inner diameter of 4.6 m at the tip.

Using a copper electrode I2 having 260 recesses with a base end inner diameter of 2mm and a taper angle of 8.8 degrees, electrical discharge machining is performed in three stages: rough, medium, and finishing near the base of the four rows of protrusions II to remove the outside of the tip. n2
．． 5i+m, a base end outer diameter of 4.5M, and a height of 6.5fi, a nozzle 9' was formed to obtain a bushing plate 10'.

[Conventional example] As shown in Fig. 1a, a bushing plate material 1 made of platinum-rhodium alloy with a width of 100 mm, a length of 40 mm (1+n), and a thickness of 8 mm is arranged in four pieces with a diameter of 4.5 mm at 9 fi intervals. Radius 1501■ in which holes 2 are arranged at intervals of 4.6 mm in the length direction,
Place it on a template 3 with a length of 500 m and a thickness of 30+a+, press it with a forging hammer 4, and press a part of the bushing plate material l into the hole 2 of the template 3 by plastic deformation to obtain a material with a height of 5 mm and a diameter. 4.6 Form the fin protrusions 6 and thin the parts of the bushing plate material 1 other than the protrusions 6 to a thickness of 2 m, and then punch from the back side of each protrusion 6 of the bushing plate material 1 as shown in Figure 1. 7, and the inner diameter is 1.
A nozzle hole 8 with a diameter of 8 mm was bored to form a nozzle 9 with an outer diameter of 2.5 mm and a height of 6 mm to obtain a bushing plate 10.

When the quality of five bushing plates of Example 1.2 and the conventional example was inspected, the results shown in the table below were obtained.

In addition, when we inspected the quality of the glass fibers manufactured using the bushing plates of Examples 1 and 2 and the conventional example, we found that the glass fibers manufactured using the conventional bushing plates were cut midway or had variations in thickness. However, the glass fiber made with the bushing plate of Example 1.2 had no such problems and had high dimensional accuracy. In addition, when the conventional bushing plate was energized as a heating element, the temperature distribution was uneven, so there was a difference in the viscosity of the molten glass discharged from the nozzle, and the quality of the glass fiber obtained was uneven. When the bushing plate in this example was energized as a power generator, the temperature distribution was uniform, so the viscosity of the molten glass discharged from the nozzle was constant, and the quality of the resulting glass fiber was uniform.

As can be seen from the above explanation, according to the bushing plate manufacturing method of the present invention, glass fibers etc. with high dimensional accuracy and uniform quality can be produced, the wall thickness of the nozzle is uniform, there is no crack in the nozzle, and This method has the excellent effect of easily producing a bushing plate with uniform plate thickness and a uniform nozzle height. Further, according to the method for manufacturing a bushing plate of the present invention, there is an effect that even a bushing plate having a small diameter nozzle or a small pinch nozzle, or a bushing plate having a small pitch nozzle can be easily manufactured.

[Brief explanation of drawings]

Figures 1a and 1b are diagrams showing the steps of a conventional bushing plate manufacturing method, and Figures 2a and 2b are similar to Figure 1a. Figure 3b is an enlarged view showing the defect state in the process of the manufacturing method shown in Figure 3A, b, and c are views showing the process of the manufacturing method of the bushing plate of the present invention; A-A
Enlarged cross-sectional views, Figures 4a and b. C is a diagram showing steps of another example of the method for manufacturing a bushing plate of the present invention, and C is an enlarged cross-sectional view taken along the line B-B in the same figure. l---Bushing plate material, 8'--Nozzle hole, 9'--1-Nozzle, io'--Bushing plate, 11...-Convex strip, 12--- -One electrode. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 2 (CI) Figure 2 (b) Figure 3 (Q) Figure 3 (b) Figure 3 (C) Figure 4 (Q) Figure 4 (b) Figure 4 (c)

Claims (1)

[Claims] One method is to drill a large number of nozzle holes in the bushing plate material in an array, and the other is to cut the area around the surface of the bushing plate material where the large number of nozzle holes are located so that it has multiple rows of convex shapes. A method for manufacturing a bushing plate l-, which comprises performing electrical discharge machining on the periphery of each nozzle hole in a convex portion of the bushing plate material in which a large number of nozzle holes are located, to finish the nozzle outer shape.