JP3033874B2 - 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 of making a bushing base plate having a nozzle hole for a molten glass filled box or bushing used to produce glass fibers or continuous glass filaments.

[0002]

2. Description of the Related Art Conventionally, several methods have been used for manufacturing a bushing base plate.

For example, one method is to form a discharge hole projection into a pipe shape in advance and insert it into a hole formed in a base plate, and join it by welding or brazing.

[0004] Another method is to form a projection of a discharge hole as a solid chip in advance, insert it into a hole drilled in a base plate, join it by brazing or welding, and further connect it to the center thereof. This is a method of forming a discharge hole by drilling.

In another method, a bushing base plate material is previously extruded from a thick material using a forging, roll, press, or the like, and a small amount of the protrusion is extruded in advance. A method of forming a hole has been adopted.

[0006]

The above-mentioned method of manufacturing a bushing base plate has the following problems.

[0007] In the first example, there is a problem in that it takes a lot of man-hours for the pipe-shaped forming process, and there is a problem of joining reliability, and serious defects such as leakage of liquid or dropping out of chips during spinning of glass fiber. there were.

Another method is that the same defect is caused by the same joining method as described above, and the center of the protrusion is formed in the discharge hole to be drilled in order to perform drilling after joining. It is inevitable that the thickness at the outlet side of the discharge hole will be uneven because the center is difficult to match, and the base plate material is a Pt alloy, which significantly deteriorates machinability and shortens the drill life. In particular, when trying to form a small-diameter discharge hole, there is a problem that the drill is frequently broken and it takes a long time to work, and the production loss is increased due to the generation of cutting chips, and the productivity is deteriorated. Was.

Further, another method does not cause any serious defects such as pipe-like defects such as liquid leakage during glass fiber spinning and chip falling off. However, projections are partially formed by pressing from a thick plate. To extrude the part,
As the processing is repeated in sequence, the base plate material expands in the horizontal direction due to compression, causing the initially formed protrusions to shift in position, and subsequent hole processing such as punching and reaming will shift the position by that amount. Would.
In addition, if the punching operation is performed by press working with the displacement, the thickness of the projection of the discharge hole will be uneven. When the glass fiber is discharged and spun using the uneven discharge hole, the fiber is broken in the middle or the fiber diameter varies, thereby deteriorating the quality of the glass fiber. In addition, according to this working method, a defect such as a crack is generated on the side surface of the protrusion unless the hole forming work repeatedly forms the protrusion height and the hole size little by little. Since the work for determining the length of the projection is performed, the work time is too long. In addition, it takes a lot of time and a skilled worker to finish the projections of the discharge holes formed by this method at the same height.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention is intended to solve the above-mentioned problems, and in particular, there are serious problems such as glass leaking caused by joining the projection to the bushing base plate by brazing or welding, and dropping of the projection. Defects can be eliminated, the thickness of the discharge holes can be made uniform, the cracks and cracks do not occur in the discharge holes, and the plate can be made flat and uniform, greatly reducing the number of work steps, and cutting An object of the present invention is to provide a method of manufacturing a bushing base plate which reduces the processing loss and does not require a skilled operator for final finishing.

[0011]

According to a method of manufacturing a bushing base plate of the present invention, the bushing base plate material is formed into a flat bushing plate material by forming the bushing base plate material into a required thickness of a product by a rolling mill. later,
One or a plurality of punches are provided on both the upper and lower sides of the press die, and a glass injection hole forming punch is set on one side and a discharge hole outlet forming punch is set on the other side. On the outlet side of the discharge hole, a hole having a tapered shape is formed on the glass introduction hole side of the bushing base plate by using a press-molding die provided with a die necessary for forming the projection. With straight hole processing on the side,
The ejection hole projections are simultaneously extruded and formed.

To explain in more detail with reference to the drawings, as shown in FIG. 1, a pad 1 for holding the entire base plate is provided on the lower side of the press die. It has a structure in which a plurality of holes are drilled, and a punch 2 conforming to the shape of the introduction hole is inserted therein, and a plurality of holes having a taper for forming the protrusion on the die 3 for forming the outer shape of the protrusion on the upper side. The bushing base plate material 5 is inserted into a press die having a structure in which a discharge hole forming punch 4 corresponding to the discharge hole exit size at the center thereof is inserted, and press working is performed sequentially from one side. . The projection 8 is formed on the bushing base plate member 5 as shown in FIG. By successively pressing, the entire molding of the bushing base plate is completed as shown in FIG. Thereafter, as shown in FIG. 4, the discharge hole 12 having a predetermined projection 8 'is formed by shaping or reaming the inner surface of the discharge hole 12 and forming the inner surface. It is characterized by the following.

Further, the material of the bushing base plate is preliminarily processed to a predetermined height at a portion where the protruding portion is to be formed. By performing this, it is possible to form a discharge hole having a higher protruding portion.

Further, the material of the bushing base plate is obtained by preliminarily forming a shallow introduction hole in a portion where a glass introduction hole is to be formed, and a lower projection having a predetermined height on the opposite side. By using the above-mentioned press-molding die to perform the processing, it is possible to easily form a discharge hole having a small diameter and a long protrusion, which is difficult to form.

[0015]

As described above, in the method of manufacturing a bushing base plate according to the present invention, the leakage of glass during spinning of glass fibers in a bushing base plate manufactured by welding or brazing a pipe-shaped tip or a solid tip for a projection is described. It is possible to obtain an excellent bushing base plate which does not cause a serious defect such as a dropout of the ejection hole projection.

Further, according to the present invention, a bushing base plate having a finished thickness obtained by rolling can be used, and a large number of discharge hole projections can be formed and glass introduction holes and discharge hole outlets can be formed. At the same time, press working can be performed, and large deformation is not applied to the entire base plate, and plastic deformation stress is concentrated only on the portions requiring the projections and the discharge holes, so that the dimensional accuracy of the entire base plate can be maintained high. In addition, since the protrusion is formed and the extrusion molding is performed by receiving the compressive stress on both the introduction hole side and the exit side of the discharge hole, the material does not generate a crack or a crack due to tension, and the uniform bushing has high dimensional accuracy. A base plate can be obtained.

Further, according to the present invention, the bushing having high spinning stability, particularly when the thickness of the discharge hole outlet side is varied in thickness, causes breakage during spinning of the glass fiber or variation in fiber diameter. Can be obtained.

Further, according to the present invention, since cutting such as drilling is not performed to form a discharge hole,
As already mentioned, thread breakage during glass fiber spinning caused by uneven wall thickness at the outlet of the discharge hole due to drilling, the dispersion of fiber diameter is reduced, and there is no workability of drill breakage and cutting work. The productivity was greatly improved, and the processing loss of the Pt alloy material was significantly reduced.

[0019]

Embodiment 1 An embodiment of a method of manufacturing a bushing base plate according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, a plurality of punches 2, in this example, six punches 2, are provided at a lower portion. The punch 2 has a lower die 6 inserted into the pad 1 and a tapered concave portion 7 and has the same. The die 3 with the punch 4 inserted in the center is mounted on a press die set (not shown), and the width is 80 mm, the length is 500 mm, and the thickness is
A bushing base plate material 5 made of a 2.0% Pt-Rh 10% alloy is inserted and punching is performed, and as shown in FIG.
A concave portion of the inlet hole 10 is formed from the lower side, and the pressing and the pressing are repeated in order according to the arrangement, so that a staggered arrangement with a pitch of 4.0 mm and a shape having the protrusion 8 having 800 outlet outlets 9 and the inlet hole 10 are formed. Molding. At this time, the size of the formed discharge hole is a = 1.8 mm, the depth is b = 3.0 mm, the height of the protrusion is c = 5.0 mm, the depth of the introduction hole is d = 3.5 mm, and the depth of the introduction hole is as shown in FIG. The hole entrance dimension was formed into a shape of e = 3.5 mm. The pressed bushing base plate is further subjected to shaving as shown in FIG. 4 to form a closed (bridge) portion inside the discharge hole to form a discharge hole diameter of 1.85 mm, which is the final product size. Thus, a bushing base plate 13 having a discharge hole of 800 holes was completed.

[0021]

Embodiment 2 Next, another embodiment of the method of manufacturing the bushing base plate of the present invention will be described. A case will be described in which the starting material of the bushing base plate, that is, the material before the press forming of the present invention is processed in advance as shown in FIG.

Using the press die used in Example 1, the lower die pad 1 was lowered by 1.5 mm to form the punch 2 for forming an inlet hole.
The 1.5 mm pad 1 is set so that it protrudes from the upper surface, and the base plate is inserted thereon. The upper die is set without changing the position of the ejection hole forming punch 4 to have a width of 80 mm, a length of 500 mm, 800 pre-formed base plates with a thickness of 2.0 mm, the pre-processed protrusions have a height of 1.5
mm, diameter 3.5mm, glass introduction hole side diameter 3.0mm, depth
The same operation as in Example 1 was performed using a molded product having a size of 1.5 mm. The size of the discharge hole formed at that time is a =
1.45 mm, depth b = 3.0 mm, protrusion height c = 5.0 mm, depth d of the inlet hole d = 3.5 mm, inlet hole entrance dimension e = 3.5 mm. After this pressing, shaving is performed to form a hole (bridge portion) on the outlet side of the discharge hole, thereby finishing the final discharge hole diameter to 1.50 mm. Finished bushing base plate.

[0023]

As can be seen from the above description, according to the manufacturing method of the bushing base plate of the present invention, the thickness of the projection discharge hole which can produce glass fiber or the like having high dimensional accuracy and uniform quality is uniform. The projection and the base plate material are integrally formed without joining them by brazing or welding, so there are no serious defects such as glass leakage or falling off, and the projections are flatter without defects such as cracks. This makes it possible to produce a uniform bushing base plate having a uniform thickness.

Further, according to the method of manufacturing the base plate of the present invention, since the formation of the projections and the formation of the discharge holes and the introduction holes are performed only by compressing and extruding the portions, the other portions of the bushing base plate are affected. Since there is no such effect, the required minimum press pressure is sufficient, and there is an excellent effect that thin-walled integral molding can be easily performed.
In addition, it is possible to mass-produce continuously with a press machine, there is no need for skilled workers, and there is no cutting work such as drilling. Has an excellent effect. The bushing using the manufacturing method of the bushing base plate according to the present invention has an effect that stable spinning can be performed without breakage or variation in fiber diameter during spinning of glass fiber.

[Brief description of the drawings]

FIG. 1 is a view showing a process of the present invention.

FIG. 2 is a view showing a process of the present invention.

FIG. 3 is a view showing a process of the present invention.

FIG. 4 is a view showing a process of the present invention.

FIG. 5 is a sectional view of a main part showing a bushing plate material used in another example of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pad 2 introduction hole forming punch 3 protrusion forming die 4 discharge hole forming punch 5 base plate material 6 lower die 7 tapered recess 8 ′ protrusion 12 discharge hole 13 bushing plate

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C03B 37/00-37/16

Claims (3)

(57) [Claims] In a manufacturing method of forming a discharge hole having a projection of a bushing base plate, a bushing base plate material is formed by simultaneously compressing a glass introduction hole from one direction and forming a projection and discharge holes from the other side. A method of manufacturing a bushing base plate, which comprises forming and then penetrating a projection. 2. The manufacturing of a bushing base plate according to claim 1, wherein a material having a low-height protrusion preliminarily formed on a portion of the bushing base plate where the protrusion is to be formed is preliminarily formed. Method. 3. A material in which a shallow introduction hole is formed in advance in a portion of the bushing base plate where a glass introduction hole is to be formed, and a low protrusion is preformed on the opposite side thereof.
A method for manufacturing a bushing base plate, comprising performing the forming process according to claim 1.