JPS6217038A - Production of bushing plate - Google Patents

Abstract

PURPOSE:To obtain the titled plate capable of providing a high-quality glass fiber, etc., having uniform thickness, excellent dimensional accuracy and which is hardly cracked by machining the rear surface of a bushing plate on which circular protrusions are formed by using a specified die and boring a nozzle hole through the circular protrusion. CONSTITUTION:A busing plate material 1' (e.g., Pt-Rh alloy) is inserted between the upper die 12 having plural protruded tracks 11 on the lower surface and the lower die 14 having staggered circular tapered chip holes 13 on the upper surface while opposing to the protruded track 11 and pressed to form many circular protrusions 5 on the plate 1'. Then the whole surface of the protrusion 15 on the rear surface side is machined to form a flat surface 1a. The tapered nozzle hole 17 is concentrically bored through many circular protrusions from the flat surface 1a side by using a punch 23 and a reamer 24 to form a nozzle 18.

Description

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

(Prior Art) Conventionally, in order to manufacture a bushing plate, first, as shown in FIG. Pressing or rolling with roll 5,
A part of the bushing plate material is pushed into the chip hole 2 of the template 3 by plastic deformation to form the protrusion 6, and the parts of the bushing plate material 1 other than the protrusion 6 are thinned.

Thereafter, each time the mold 3 and the bushing plate material 1 are intermittently fed forward by a constant size, the plastic working is performed to form the projections 6 on the entire surface of the bushing plate material 1, and to form the projections 6.
All other parts are thinned.

Next, as shown in FIG. 8, a punch and a reamer 7 were driven into the projections 6 of the bushing plate material 1 from the back side, and a nozzle hole 8 was formed to form a nozzle 9, thereby making a bushing plate 10. .

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

(1) During the pressing process using the forging hammer 4 or the rolling process using the roll 5 shown in Fig. When the nozzle hole 8 is punched and the nozzle 9 is formed, the thickness of the nozzle 9 becomes uneven as shown in FIG.

Therefore, when glass fiber is discharge-spun using such a nozzle 9, it may be cut midway or the thickness may vary, resulting in a loss of quality.

(2) Shear stress S at the base of the protrusion 6 formed on the material 1 by pressing or rolling, as shown by the arrow in Figure 8a.
This is generated and remains when the nozzle hole 8 is formed by driving the punch and reamer 7, so that when exposed to the high temperature state of glass melting, cranking occurs and the service life is 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 molding, 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 parts other than the protrusion 6 are compressed at the same time,
A pressing force greater than necessary is required, and it is difficult to secure the polyurethane on the protrusions 6. Therefore, the present invention aims to solve the above problems, and it is possible to make the thickness of the nozzle uniform,
In addition, we would like to provide a method for manufacturing a bushing plate that does not cause cracks or breaks in the nozzle, can make the plate flat and have a uniform thickness, and requires only the minimum necessary pressing pressure (and can easily secure the volume of the protrusions). That is.

(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; A large number of circular protrusions are formed on the bushing plate material by pressing with a lower mold having a circular chip hole on the upper surface. Next, the entire back surface of the circular protrusions is machined, and then the machined side of that side is machined. It is characterized in that nozzle holes are concentrically formed in a larger number of circular protrusions.

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 on the bushing plate material in the same manner as described above, and then to make the lower mold holes face the unfavorable parts. After pressing the back surface of the part 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 is front-processed, and then nozzle holes are formed concentrically in a large number of circular protrusions from the processed surface side.

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

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

Furthermore, in the bushing plate manufacturing method of the present invention, when the circular protrusions are provided protrudingly on the bushing plate material, only the corresponding portions are compressed, so the minimum necessary pressing force is sufficient, and the volume of the circular protrusions can be easily secured. .

(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. As shown in Figure 1a, there are multiple pieces on the bottom surface, in this example, five pieces with a base width of 8 mm and a tip width of 7 mm.
An upper mold 12 has protruding stripes 11 of 15 mm and 5 mm spacing, and a staggered arrangement (in this example, a staggered arrangement with two rows) on the upper surface as shown in FIG.
As shown in FIG. 2, a platinum-rhodium lO% film having a width of 100 mm, a length of 230 mm, and a thickness of 4.8 mm is placed between the lower die 14 having five circular tapered tip holes 13 (two per hole).
Insert the bushing plate material 1' made of alloy,
The material 1' was set at a predetermined position on the lower mold 14. Next, the upper mold 12 is lowered as shown in FIG. 3, and the bushing plate material 1' is pressed.The bushing plate material 1' has a base diameter of 4.5 mm and a diameter of 2.5 mm from the middle part to the tip. 2 mm, length 2.5 mm circular protrusion 15
Five protruding rows were installed in a staggered arrangement. Next, the entire surface of the bushing plate material 1' on the back side of the circular protrusion 15 was machined to a thickness of 2 mm using a mill as shown in FIG.

After that, the processed surface l of the bushing plate material 1'
Tapered nozzle holes 17 are concentrically drilled in a large number of circular protrusions 15 from side a using a punch 23 as shown in FIG. 5 and a reamer 24 as shown in FIG.
A nozzle 18 having a tip wall thickness of 0.35 mm was formed, and a bushing plate 19 was manufactured.

In this embodiment, the upper die 12 is pressed once, but depending on the material of the bushing plate material 1', one press work 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 bushing plate manufacturing method of the present invention will be described. Width 100mrn as shown in Figure 2
, length 250mm, thickness 5mm platinum-rhodium 10%
Five circular protrusions 15 were formed in a staggered arrangement on the bushing plate material 1' made of an alloy by press-less processing using an upper die in the same manner as in the above embodiment (see Fig. 3), and later, as shown in Fig. 7, An upper mold 21 having a protruding strip 20 on the lower surface opposite to a portion of the mold 14 that does not have the staggered tapered chip holes 13, that is, the portion of the upper mold 12 that does not have the protruding strip 11 is defined as the protruding strip 20. Using an upper die 21 in which the portion having the protrusions 11 was made into a concave portion, the back surface of the portion 22 of the bushing plate material 1' where the circular protrusions 15 were not arranged and projected was pressed to 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' was machined to a thickness of 4 mm using a mill as shown in FIG. After that, the bushing plate material 1
A fifth circular protrusion 15 is formed on the side of the machined surface 1a.
A punch 23 as shown in the figure and a reamer 24 as shown in FIG.
Tapered nozzle holes 17 are concentrically drilled to form a nozzle 18 with a middle part thickness of 0.6 mm and a tip part thickness of 0.35 mm.
A bushing plate 19' was manufactured.

In this embodiment, the upper mold 12 is pressed twice and the upper mold 21 is pressed once, but if it is desired to secure a larger amount of poly for the circular protrusion 15, the upper mold 12 and the upper mold 21 are pressed once. It is preferable to repeat the alternating pressing of the molds 21 several times.

A conventional example for the above embodiment will be explained as shown in Fig. 8a.
As shown in the figure, the width is 100mm, the length is 400mm, and the thickness is 8mm.
A bushing plate material 1 made of a platinum-rhodium 10% alloy of
Width: 150 mm, arranged at 4.6 mm intervals in the length direction
, placed on a mold 3 with a length of 500 mm and a thickness of 30 mm, and pressed with a forging hammer 4 to push a part of the bushing plate material 1 into the hole 2 of the mold 3 by plastic deformation to a height of 5 mm and a diameter of 4. 5 mm protrusions 6 were formed, and the parts of the bushing plate material 1 other than the protrusions were thinned to 2 mm in thickness, and then a punch and reamer 7 was inserted into the bushing plate material 1 from the back side of each protrusion 6 as shown in Figure 8. Drill a nozzle 68 with an inner diameter of 1.8 mm, and make a nozzle with an outer diameter of 2.5 mm.
A bushing plate 10 was manufactured by forming a nozzle 9 with a length of 6 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 variations in thickness. However, there was no such thing in the glass fiber made with the bushing plate of Example 1.2.
The dimensional accuracy was high. Furthermore, when the conventional bushing plate was energized as a heating element, the temperature distribution was uneven, resulting in a difference in the viscosity of the molten glass discharged from the nozzle, and the quality of the obtained glass fiber was uneven. When the bushing plate in this 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 bushing plate manufacturing method of the present invention, the wall thickness of the nozzle is uniform, making it possible to manufacture glass fibers with high dimensional accuracy and uniform quality.
This has the excellent effect that no shear stress remains at the base of the nozzle, which prevents it from cracking under high temperature conditions, and furthermore, it is possible to make a uniform bushing plate with a flat plate and no uneven thickness. Furthermore, according to the bushing plate manufacturing method of the present invention, when protruding the circular protrusion to form the nozzle of the bushing plate, only the part is compressed, so the minimum necessary pressing pressure is sufficient, and the circular protrusion It is easy to secure the volume, and the bushing plate has the advantage of being easy to manufacture without requiring special training or technology.

[Brief explanation of drawings]

FIG. 1a is a sectional view of the upper mold, FIG. 1 is a sectional view of the lower mold, FIG. FIG. 7 is a diagram showing a process in an example, FIG. 8 is a diagram showing a process in another embodiment, FIG.
b is an enlarged view showing steps of a conventional bushing plate manufacturing method. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Fig. 1 (C1) Fig. 1 (b) 14:1 type Fig. 1 (C) Fig. 2 1'; 15: PIY start Figure 5 Figure 6 19j9': Funosinku plate Figure 7 20:0 Spring 21: Upper mold

Claims (1)

[Claims] 1) The bushing plate material has a large number of chips 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 nozzle holes concentrically in a large number of circular protrusions on the chamfered surface. Characteristic bushing plate manufacturing method. 2) A large number of circular protrusions are formed protruding on the bushing plate material 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. 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 chip 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 of manufacturing a bushing plate, comprising: forming a bushing plate.