JPH0333663B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for making base plates, so-called bushing plates, with nozzle holes for molten glass filling boxes or bushings used for producing glass fibers or continuous glass filaments. Conventionally, in order to manufacture a bushing plate, first a bushing plate material 1 is prepared as shown in FIG.
The butting plate material 1 is placed on a template 3 having a large number of holes 2 at regular intervals, and pressed with a forging hammer 4 or rolled with a roll 5 to fill the holes 2 of the template 3 with the bushing plate material 1. A portion of the bushing plate material 1 is pushed in through plastic deformation to form the projections 6, and the portions of the bushing plate material 1 other than the projections 6 are thinned. Next, the first
As shown in FIG. b, a punch 7 is driven into the bushing plate material 1 from the back side of the protrusion 6, a nozzle hole 8 is bored, and a nozzle 9 is formed, thereby producing a bushing plate 10. However, this method of manufacturing a bushing plate has the following problems. (1) In the process of pressing with the forging hammer 4 or rolling with the rolls 5 in Figure 1a, the material 1 flows as shown by the arrow and the protrusions 6 as shown in Figure 2a.
Since the center of the hole is shifted from the hole 2, the punch 7
When the nozzle hole 8 is punched to form the nozzle 9, an uneven thickness occurs in the nozzle 9 as shown in FIG. 2b. Therefore, such a nozzle 9
When glass fibers are discharge spun, they may be cut midway or have uneven thickness, which impairs quality. (2) As shown in Figure 2a, shear stress S is generated at the base of the protrusion 6 formed in the material 1 by pressing or rolling, and this remains when the nozzle hole 8 is punched by driving the punch 7. When exposed to the high temperature conditions of glass melting, cracks occur and the service life is significantly reduced. (3) When the nozzle hole 8 is formed by driving the punch 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 mm or less) because the punch 7 will break. (5) If the pitch of the nozzles 9 is made smaller, the wall thickness between the nozzles 9 of the template 3 becomes thinner, and if it becomes less than 0.5 mm, it will break, so the pitch of the nozzles 9 cannot be made too small. (6) The bushing plate 10 pressed by a forging hammer has uneven thickness, so when it is energized as a heating element, the temperature distribution will not be uniform, so the viscosity of the molten glass discharged from each nozzle 9 will vary. This causes a difference in the quality of the obtained glass fiber, 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, and it is possible to make the thickness of the nozzle uniform, prevent cracks or cracks from occurring in the nozzle, and easily form a nozzle with a small diameter or a small pitch. The object of the present invention is to provide a method for manufacturing a bushing plate having a uniform thickness and a uniform nozzle height. The method for manufacturing a bushing plate of the present invention includes adding a bushing plate material 1 to a bushing plate material 1 as shown in FIG. 3a.
A large number of nozzle holes 8' are arranged and bored by drilling (rough processing of the inner surface of the nozzle) and cutting reaming (finishing of the inner surface of the nozzle), and a large number of holes are formed on the surface of the butting plate material 1 as shown in FIG. 3b. After sequentially cutting the area around which the nozzle hole 8' is located so as to form a plurality of rows of protrusions 11, the bushing plate material 1 is cut as shown in FIG. 3c. multiple nozzle holes 8'
The outer shape of the nozzle is formed by electrical discharge machining the periphery of each nozzle hole 8' in the part of the protrusion 11 where the nozzle is located, using an electrode 12 having a recess or hole matching the nozzle shape, to near the base end of the protrusion 11. ′,
A bushing plate 10' is made. As described above, in the method for manufacturing a bushing plate of the present invention, the bushing plate material 1 does not need to be pressed or rolled, and the bushing plate material 1 does not need to be punched, but can be drilled and cut. Since the nozzle hole 8' is bored by reaming, the material 1 is not plastically deformed.
No shear stress or tensile stress occurs. Therefore, no cracks or breaks 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 a nozzle hole 8' with a small pitch can be easily drilled. Furthermore, the nozzle outer shape is formed by electric discharge machining to near the base end of the protruding strip 11 using the electrode 12 having a recess or hole that matches the nozzle shape around the nozzle hole 8' to form the nozzle 9'. There is no unevenness in wall thickness. Therefore,
When the glass fiber is discharged and spun from this nozzle 9', it is possible to obtain a fiber with high dimensional accuracy without being cut midway or with variations in thickness. 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 is discharged from each nozzle 9'. The viscosity of is constant, and the quality of the obtained glass fiber etc. is 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 there is no plastic deformation at all, so the height is the same as that of the original bushing plate material 1. 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 Figure 3a, a bushing plate material 1 made of platinum-rhodium alloy with a width of 100 mm, a length of 400 mm, and a thickness of 8 mm was subjected to drilling (rough processing of the inner surface of the nozzle) and cutting and reaming (finishing of the inner surface of the nozzle). processing)
Therefore, 65 nozzle holes 8' with a tip inner diameter of 1.8 mm and a base end inner diameter of 4 mm are formed at a pitch of 4.6 mm in the length direction and 4 in the width direction.
A total of 260 nozzle holes were drilled, and then, as shown in Fig. 3b, the surface of the bushing plate material 1 where the many nozzle holes 8' are located was 5 mm wide, 300 mm long, and 6 mm high.
Then, as shown in FIG. Around the nozzle hole 8', a copper electrode 12 having 65 recesses with a tip inner diameter of 4.6 mm, a base end inner diameter of 2 mm, and a taper angle of 9 degrees generates electrical discharge in three stages: rough, medium, and finishing near the base of the protrusion 11. After processing, the outer diameter of the tip is 2.5 mm, the outer diameter of the base is 4.5 mm, and the height is 6 mm.
The nozzle outer shape is molded, the nozzle 9' is molded,
A bushing plate 10' was obtained. Example 2 As shown in FIG. 4a, the positions of a number of nozzle holes 8' to be drilled later on the surface of a bushing plate material 1 made of platinum-rhodium-zirconium oxide and having a width of 100 mm, a length of 400 mm, and a thickness of 8 mm. The width of the part is 5mm,
The periphery is cut to form four rows of protrusions 11 with a length of 300 mm and a height of 6.5 mm, and then each protrusion 11 of the bushing plate material 1 is cut as shown in Fig. 4b.
By drilling (rough processing on the inner surface of the nozzle) and cutting reamer processing (finishing on the inner surface of the nozzle),
Nozzle hole 8' with a tip inner diameter of 1.8 mm and a base end inner diameter of 4 mm.
A total of 260 holes are drilled in each row of 65 holes at a pitch of 4.6 mm, and then, as shown in FIG.
The inner diameter of the tip is 4.6 around each nozzle hole 8' in part 1.
mm, inner diameter of the base end is 2 mm, and taper angle is 8.8 degrees. Using a copper electrode 12 having 260 recesses, the outer diameter of the tip is A nozzle outer diameter of 2.5 mm, a base end outer diameter of 4.5 mm, and a height of 6.5 mm was molded to form a nozzle 9' 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 400 mm, and a thickness of 8 mm has four holes 2 with a diameter of 4.5 mm spaced at intervals of 4.6 mm at intervals of 9 mm. Width 150 arranged lengthwise
mm, length 500 mm, thickness 30 mm plate 3, press-worked with a forging hammer 4, and press a part of the bushing plate material 1 into the hole 2 of the template 3 by plastic deformation. 5 mm and a diameter of 4.6 mm, and the protrusions 6 of the bushing plate material 1.
Then, as shown in Fig. 1b, punch 7 is driven from the back side of each protrusion 6 of bushing plate material 1 to make a nozzle hole 8 with an inner diameter of 1.8 mm. A nozzle 9 having a diameter of 2.5 mm and a height of 6 mm was formed to obtain a bushing plate 10. When the quality of five bushing plates of Examples 1 and 2 and the conventional example was inspected, the results shown in the table below were obtained.

[Table] 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 not cut in the middle,
Although there were many variations in thickness, the glass fibers made using the bushing plates of Examples 1 and 2 had no such variations and had high dimensional accuracy. In addition, when the conventional bushing plate was energized as a heating element, the temperature distribution was uneven, which caused differences in the viscosity of the molten glass discharged from the nozzle, resulting in uneven quality of the glass fiber obtained. Since the bushing plate of the example had a uniform temperature distribution when energized as a power generator, the viscosity of the molten glass discharged from the nozzle was constant, and the quality of the obtained glass fiber was uniform. As can be seen from the above explanation, according to the method for manufacturing a bushing plate 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 are no cracks in the nozzle, Furthermore, there is an excellent effect that a bushing plate with uniform plate thickness and nozzle height can be easily produced. Further, according to the method of manufacturing a bushing plate of the present invention, there is also an effect that a bushing plate having a small diameter nozzle or a small pitch nozzle, or a bushing plate having a small pitch nozzle can be easily produced.

[Brief explanation of drawings]

FIGS. 1a and b are diagrams showing the steps of a conventional bushing plate manufacturing method, and FIGS. 2a and b are enlarged views showing defective states in the manufacturing method steps shown in FIGS. 1a and b. Figures 3a, b, and c are diagrams showing the steps of the bushing plate manufacturing method of the present invention,
Figure 4c is an enlarged sectional view taken along line A-A in Figure 4b, Figure 4a,
b and c are diagrams showing steps of another example of the method for manufacturing a bushing plate of the present invention;
It is a BB cross-sectional enlarged view of. DESCRIPTION OF SYMBOLS 1... Bushing plate material, 8'... Nozzle hole, 9'... Nozzle, 10'... Bushing plate, 11... Convex strip, 12... Electrode.

Claims (1)

[Claims] 1. Arranging and drilling a large number of nozzle holes in the bushing plate material, and cutting the area around the surface of the bushing plate material where the large number of nozzle holes are located so as to form multiple rows of convex shapes. The bushing is characterized in that the outer shape of the nozzle is finished by carrying out electrical discharge machining around each nozzle hole of the convex portion of the bushing plate material in which a large number of nozzle holes are located. Method of manufacturing plates.