JPH0475175B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention makes a base plate with nozzle holes for a molten glass filling box or bushing, a so-called bushing plate, used for manufacturing glass fibers or continuous glass filaments. Regarding the method.

(Prior Art) Conventionally, in order to manufacture a bushing plate, first a bushing plate material 1 is prepared as shown in FIG. 8a.
is placed on a mold 3 having a large number of chip holes 2 at regular intervals, and pressed with a forging hammer 4, or
The chip hole 2 of the template 3 is formed by rolling with the roll 5.
A part of the bushing plate material is forced into the inside by plastic deformation to form the projections 6, and at the same time, the parts of the bushing plate material 1 other than the projections 6 are thinned. Thereafter, each time the mold 3 and the bushing plate material 1 are intermittently fed by a certain size, the plastic working is performed to form protrusions 6 on the entire surface of the bushing plate material 1.
is formed, and the entire portion other than the protrusion 6 is made thin. Next, as shown in FIG. 8b, a punch and a reamer 7 are driven into the projections 6 of the bushing plate material 1 from the back side, a nozzle hole 8 is formed to form a nozzle 9, and a bushing plate 10 is manufactured. It was on.

(Problems to be Solved by the Invention) By the way, the above-mentioned method for manufacturing a bushing plate has the following problems.

(1) In the process of pressing with the forging hammer 4 or rolling with the roll 5 in Fig. 8a, the material 1
flows as shown by the arrow, and the center of the protrusion 6 shifts from the hole 2. After that, the punch and reamer 7 are driven in to form the nozzle hole 8 and the nozzle 9 is formed, as shown in FIG. 8b. Uneven wall thickness occurs. Therefore, when a glass fiber is spun using such a nozzle 9, the fiber may be cut midway or the thickness may vary, resulting in a loss of quality.

(2) Shear stress S is generated at the base of the protrusion 6 formed in the material 1 by pressing or rolling, as shown by the arrow in FIG. If exposed to the high temperature conditions of glass melting, cracks will occur and the service life will be significantly shortened.

(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) The bushing plate 10 press-worked by the forging hammer 4 loses flatness on the back surface due to partial forming and has an uneven plate thickness. Therefore, when electricity is applied as a heating element, the temperature distribution is not uniform, and therefore there is a difference in the clay of the molten glass discharged from each nozzle 9, and the quality of the obtained glass fiber etc. is uneven.

(5) Since the flat portions other than the protrusions 6 are compressed at the same time, more pressing force than necessary is required, and it is difficult to secure the volume of the protrusions 6. Therefore, the present invention aims to solve the above problems, and it is possible to make the wall thickness of the nozzle uniform, prevent cracks or breaks from occurring in the nozzle, and also make the plate flat and have a uniform thickness. It is an object of the present invention to provide a method for manufacturing a bushing plate that requires only the minimum necessary pressing pressure and that makes it easy to secure the volume of the projections.

(Means for Solving the Problems) One of the methods for manufacturing a bushing plate of the present invention that solves the above problems includes an upper mold having a plurality of protrusions on the lower surface, and an upper mold having a plurality of protrusions opposite to the protrusions of the upper mold. Then, a large number of circular protrusions are formed on the bushing plate material by pressing with a lower die having a circular chip hole on the upper surface, and then the entire back side of the circular protrusions is subjected to face milling.
Next, nozzle holes are concentrically formed in a large number of circular protrusions from the side of the machined surface.

Another method of manufacturing a bushing plate of the present invention that solves the above problems is to provide a large number of circular protrusions protruding from the bushing plate material in the same manner as above, and then provide the protrusions facing the part without the lower die hole. After pressing the back surface of the portion where the circular protrusions are not arranged and projected one or more times using another upper die having a plurality of protrusions on the lower surface and the lower die, the back surface of the circular protrusion is pressed one or more times. It is characterized in that the entire surface of the side face is machined, and then nozzle holes are formed concentrically in a large number of circular protrusions from the machined face side to form a nozzle.

(Function) As described above, in the method for manufacturing a bushing plate of the present invention, a large number of circular protrusions are simultaneously provided on the entire bushing plate material by press working of a mold, so that the bushing plate material expands. , and plastic deformation is small. Therefore, almost no shearing stress is generated at the base of the circular protrusion, and no cracks occur even when the nozzle hole is bored with a punch and a reamer.

Furthermore, in the method for manufacturing a bushing plate of the present invention, the entire back surface of the circular protrusion is subjected to surface cutting, so that the back surface of the bushing plate is flat and the thickness is uniform over the entire surface.

Furthermore, in the bushing plate manufacturing method of the present invention, when the circular protrusions are protruded from the bushing plate material, only the relevant portions are compressed, so only the minimum necessary pressing force is required, and the volume of the circular protrusions can be easily secured. It is.

(Example) An example of the method for manufacturing a bushing plate of the present invention will be described with reference to FIGS. 1 to 6. 1st
As shown in FIG. As shown in FIGS. 1b and 1c, a second die is provided between the lower mold 14, which has five circular tapered tip holes 13 (two per thread) on the upper surface in a staggered arrangement (in this example, a two-row staggered arrangement). As shown in the figure, a bushing plate material 1' made of 10% platinum-rhodium alloy with a width of 100 mm, a length of 230 mm, and a thickness of 4.8 mm was inserted, and the material 1' was set at a predetermined position on the lower mold 14. . Next, upper mold 1
2 is lowered as shown in Fig. 3, and the bushing plate material 1' is pressed, and the bushing plate material 1' has a diameter of 4.5 mm at the base, a diameter of 2.2 mm from the middle part to the tip, and a length of 2.5 mm. Five circular protrusions 15 are provided in a staggered arrangement. Next, the entire surface of the bushing plate material 1' on the back side of the circular protrusion 15 is milled to a thickness of 2 mm as shown in Fig. 4.
He said. After that, a large number of circular protrusions 15 are formed from the facing surface 1a side of the bushing plate material 1'.
Then, a tapered nozzle hole 17 is concentrically drilled using a punch 23 as shown in FIG. 5 and a reamer 24 as shown in FIG.
A nozzle 18 is formed, and a bushing plate 19 is formed.
was manufactured.

In addition, in this embodiment, the press working of the upper mold 12 is performed in one step.
However, depending on the material of the bushing plate material 1', one press process may not be sufficient. In such cases, it is best to perform pressing multiple times with annealing steps in between.

Next, another embodiment of the method for manufacturing a bushing plate of the present invention will be described. Platinum-rhodium with a width of 100 mm, a length of 250 mm, and a thickness of 5 mm as shown in Figure 2.
Five circular protrusions 15 were formed in a staggered arrangement on a bushing plate material 1' made of a 10% alloy by pressing with an upper die in the same manner as in the previous embodiment (see Fig. 3), and later as shown in Fig. 7. As shown in FIG. 20 and an upper mold 21 in which the portion having the convex stripes 11 is made into a concave portion, the circular protrusions 15 of the bushing plate material 1' are arranged in a portion 22 where the circular protrusions 15 are not protruded.
The back side of the plate was pressed to have a thickness of 4 mm. Next, the upper die 12 was pressed again to form a circular protrusion 15 with a length of 3 mm. Next, the entire back surface of the circular protrusion 15 of the bushing plate material 1' is milled to a thickness of 4 mm as shown in FIG.
mm. After that, a large number of circular protrusions 1 are formed from the side of the facing surface 1a of the bushing plate material 1'.
5, a tapered nozzle hole 17 is concentrically drilled using a punch 23 as shown in FIG. 5 and a reamer 24 as shown in FIG.
mm nozzle 18, butting plate 1
9' was produced.

In addition, in this embodiment, the press working of the upper die 12 is performed in two steps.
The upper die 21 was pressed once, but
If it is desired to further increase the volume of the circular protrusion 15, it is preferable to repeat the alternating press working of the upper die 12 and the upper die 21 a plurality of times.

To explain the conventional example for the above embodiment, as shown in FIG.
The butting plate material 1 made of 10% platinum-rhodium alloy of 4 mm diameter is arranged at 9 mm intervals.
Width 150 with holes 2 arranged at 4.6 mm intervals in the length direction
mm, length 500 mm, thickness 30 mm mold 3, pressed with a forging hammer 4, and press a part of the bushing plate material 1 into the hole 2 of the mold 3 by plastic deformation, height 5 mm, diameter. 4.5 mm protrusions 6 are formed, and the parts of the butting plate material 1 other than the protrusions are thinned to 2 mm in thickness. Next, as shown in FIG. A bushing plate 10 was manufactured by driving a nozzle hole 8 with an inner diameter of 1.8 mm to form a nozzle 9 with an outer diameter of 2.5 mm and a length of 6 mm.

However, 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 uneven thickness. However, the glass fibers made using the bushing plates of Examples 1 and 2 had no such problems and had high dimensional accuracy. Furthermore, 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. When the bushing plate of the example was energized as a heating element, the temperature distribution was uniform, so the viscosity of the molten glass discharged from the nozzle was constant, and the quality of the obtained glass fiber was uniform.

(Effects of the Invention) As can be seen from the above explanation, according to the method for manufacturing a bushing plate of the present invention, the nozzle has a uniform wall thickness, which enables the production of glass fibers with high dimensional accuracy and uniform quality. It has the excellent effect of being able to produce a butting plate with no shear stress remaining at the base, which will not crack under high temperature conditions, and which is flat and uniform in thickness. In addition, according to the method of manufacturing a bushing plate of the present invention, when protruding the circular protrusion for forming the nozzle of the bushing plate, only the part is compressed, so the minimum necessary pressing pressure is sufficient, and the circular projection for forming the nozzle of the bushing plate is compressed. It is easy to ensure the volume of the protrusion, and the butting plate has the advantage of being easy to manufacture without requiring any special training or technique.

[Brief explanation of drawings]

FIG. 1a is a sectional view of the upper mold, FIG. 1b is a sectional view of the lower mold, FIG. 1c is a plan view of the lower mold, and FIGS. FIG. 7 is a diagram showing a process in another embodiment, and FIGS. 8a and 8b are enlarged views showing steps in a conventional bushing plate manufacturing method.

Claims (1)

[Claims] 1. A bushing plate material has a large number of holes formed by pressing an upper mold having a plurality of protrusions on the lower surface and a lower mold having circular chip holes on the upper surface opposite to the protrusions of the upper mold. A nozzle is formed by protruding a circular protrusion, then chamfering the entire back surface of the circular protrusion, and then drilling concentric nozzle holes in a large number of circular protrusions from the chamfered surface side. The manufacturing method of the special butching plate. 2. A large number of circular protrusions are protruded from the bushing plate material by press working with an upper mold having a plurality of protrusions on the lower surface and a lower mold having circular chip holes on the upper surface opposite to the protrusions of the upper mold. Next, the back surface of the part where the circular protrusions are not arranged and projected is pressed by another upper mold having a plurality of protrusions on the lower surface opposite to the part of the lower mold which does not have a tip hole, and the lower mold. After doing this one or more times, the entire back surface of the circular protrusion is machined, and then nozzle holes are drilled concentrically in a number of circular protrusions from the machined surface side to form nozzles. A method for manufacturing a butching plate, characterized by forming a butching plate.