JPH0273314A - Manufacturing device for ferrule - Google Patents

Abstract

PURPOSE:To provide a through-hole with high accuracy, and also, to simplify the post-working process, as well by providing an injection molding use cavity provided between a fixed side template and a movable side template, and a wire providing mechanism for providing a wire to which tension is applied extending from the movable side template direction in the cavity to the fixed side template direction. CONSTITUTION:On opposed surfaces of a fixed side template 14 and a movable side template 15, a cavity 8 of the same type as a ferrule is formed by notching the center part of each of them, and also, an injection nozzle 12 for feeding out a molding material into the cavity 8 is provided on the fixed side template 14. Also, at the time of forming a through-hole in the center of the ferrule, a wire 20 is provided extending from the movable side template 15 to the fixed side template 14 in the center part of the cavity 8. In such a case, in the center part of the cavity 8, the wire 20 is stretched in a state that tension is applied. In such a way, the through-hole can always be obtained with high accuracy, and also, the post-working process can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for manufacturing ferrules used as connectors for optical fibers and the like.

(Prior Art) Conventionally, a ferrule shown in FIG. 1 has been used as a connector for optical fibers and the like.

In this example, the ferrule 1 is made of a cylindrical ceramic material, and has a through hole 2 in the center thereof through which an optical fiber is inserted.

On the other hand, in order to manufacture the ferrule 1 shown in Fig. 1, a thick primary product ferrule 1a with a cutting allowance is first manufactured using a mold (see Fig. 2), and then a desired shape is formed by post-processing. It is cut to size.

Incidentally, conventionally, in order to manufacture the ferrule 1a, which is the primary product shown in FIG. 2, a mold shown in FIG. 6 has been used.

In the figure, a fixed platen 3 is provided with a male mold 4, and a movable platen 6, which is moved by a mold clamping ram 7, is provided with a female mold 5. Further, 8 is a cavity provided by cutting out the center portion of the female mold 5, and a space having the same shape as the ferrule to be molded is formed.

On the other hand, in this example, an elongated pin 9 is provided upright in the center of the female die 5 in the cavity 8 to form a through hole provided in the ferrule.

To manufacture a ferrule using the mold configured as described above, a molding material such as ceramics, which has been heated and eluted in advance, is filled into the cavity 8, compressed and solidified between the female mold 5 and the male mold 4, and , After solidification, move the movable plate 6 to the sixth
The structure is such that a ferrule is formed by cutting out the die by moving it in the direction A in the figure.

(Problems to be Solved by the Invention) However, in the mold as described above, a long and thin pin (for example, 100 μm in diameter) installed upright in the cavity 8
Since the pin 9 is configured to provide a through hole in the ferrule, for example, if the pin 9 bends due to repeated use, there is a problem that the through hole after molding will also bend.

In addition, when using ceramics etc. as a molding abrasive,
There is a problem in that the pins 9 are heavily worn, and as a result, the diameters of the through holes after molding become uneven, and the post-processing cutting process becomes complicated, resulting in high costs.

(Object of the Invention) In view of the above-mentioned problems, it is an object of the present invention to provide a ferrule manufacturing apparatus that can form through-holes with high precision and can also simplify post-processing steps.

(Means for Solving the Problems) In order to solve the above problems, the ferrule manufacturing apparatus according to the present invention includes an injection molding cavity provided between a fixed side template and a movable side template; The present invention is configured to include a wire arrangement mechanism that arranges a tensioned wire from the direction of the movable template to the direction of the stationary template within the cavity.

(Example) Embodiments of the present invention will be described below based on the drawings.

Note that the same members as those in the conventional example described above are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 3 is a sectional view of an embodiment device to which the present invention is applied;
10 is a mold body of an injection mold.

In the figure, a stationary mold plate 14 is provided on the fixed platen 3, and a movable mold plate 15 is provided on the movable plate 6, which is moved by the clamping ram 7, via a spacer bronch 16.

On the facing surfaces of the fixed side template 14 and the movable side template 15, a cavity 8 having the same shape as the ferrule is formed by cutting out the center portions of each other, and a cavity 8 having the same shape as the ferrule is formed.
4 is provided with an injection nozzle 12 for delivering the molding material into the cavity 8 .

Further, reference numeral 13 denotes cooling grooves through which cooling water passes, two of which are provided in each of the stationary side mold plate 14 and the movable side mold plate 15, and are configured to cool and solidify the heated and melted molding material in the cavity 8. .

On the other hand, reference numeral 11 denotes an ejector rod that moves within the spacer block 16, and a tip portion 11a consisting of a large-diameter columnar portion is provided within the movable mold plate 15 to form one side end surface of the cavity 8 and to After the molding material has solidified, the ejector rod 11 protrudes from the movable mold plate 15, thereby releasing the molded product in the cavity 8.

By the way, the feature of this embodiment device is that when forming the through hole in the center of the ferrule, in the center of the cavity 8,
The wire 20 is disposed from the movable template 15 to the fixed template 14.

In this example, the wire 20 is introduced into the mold through a wire introduction hole 15a provided through one side of the movable mold plate 15, and is also introduced into the tip portion 11a of the ejector rod 11. It is configured to be guided and further guided into the cavity 8 .

That is, FIG. 5 is a detailed sectional view of the ejector rod 11, and the wire 20 introduced into the ejector rod 11 through the circular wire introduction hole 11b provided adjacent to the tip portion 11a is connected to a pair of ejector rods 11. It is configured to be conveyed to the cavity 8 side while being inserted between guide rollers IIC and llc, and further inserted into the cavity 8 by being inserted between a pair of pressure rollers lid and lid.

The wire 20 introduced into the cavity 8 as described above is further guided into the discharge hole 14a provided in the stationary mold plate 14, and the end thereof is provided outside the mold body 10. It is configured to be fixed to the collet 21.

On the other hand, the collet 21 is connected to a support body 23 via a spring 22, and when the wire 20 is stretched in the cavity 8, the wire 20 sticks out one end and is connected to a pressure roller lid, 11d provided in the rod 11. The collet 21 is fixed via a spring 21 at the other end.
The wire 20 is supported at the center of the cavity 8 from the direction of the movable mold plate to the direction of the fixed mold plate, so that the wire 20 is always supported under tension.

The apparatus of this embodiment is constructed as described above. Next, the operation when manufacturing a ferrule using the apparatus of this embodiment will be explained.

By the way, as already mentioned, the features of the device of this embodiment are as follows.
When forming a through hole in the ferrule, a wire 20 under tension is stretched in advance at the center of the cavity 8, and injection molding is performed in this state.

Therefore, in the state shown in FIG.
ld and lld, and the other side is fixed to the collet 21 which is biased by the spring 21. Next, a molding phase material made of ceramic is melted into the cavity 8 through the injection nozzle 12. It will be injected in this condition.

In this case, in this embodiment, the wire 20 is stretched at the center of the cavity 8 under tension as described in ``1'', so the wire 20 remains in position regardless of the injection of the molding material. No cheating.

In this way, when the cavity 8 is filled with molding material,
Cooling water is flowed into the cooling grooves 13 to further solidify the molding material.

Then, after a certain period of time has passed, when the assimilation of the molding material is completed, the molded product is released from the mold, but this is done by moving the movable platen 6 in the direction of arrow B in FIG. This is done by releasing the mold from the fixed mold plate 14 and also releasing it from the movable mold plate 15 by moving the ejector rod 11 in the direction of arrow C.

FIG. 4 shows the ferrule 14 released from the mold as described in 1.
Alternatively, it is shown that it is fixed and supported only on one side end surface of the tip portion 11a of the protruding bale 11.

By the way, when the molded product is released from the mold as described above, first, the pressure contact state of the pressure contact roller lid provided in the tip portion 11a of the ejector rod 11 with respect to the wire 20 is released, and as a result, the wire 20 is released. The new wire 20 is taken in from the wire introduction hole 15a side by the amount that the movable template 15 and the ejector rod 11 have moved.

That is, as shown in FIG. 4, the wire 20 taken in from the wire introduction hole 15a is guided into the gap 24 created as the molded product is released in the movable mold plate 15, and further protrudes. Wire introduction hole 1 provided in rod 11
It is configured to be guided into the ejector rod 11 via 1b.

On the other hand, when the ferrule 1a, which is the primary molded product, is taken out from the mold body 10 as described above, the protrusion 1a is further removed.
In FIG. 4, the left wire of the molded product is cut using a knife (not shown) at approximately the P position, and the left part is also released from the collet 21, and the left wire of the molded product is separated from the tip 11a of the ferrule 1a. is the mold body 1 with wire attached.
It will be completely separated from 0.

Then, by removing the wire 20 from the wired ferrule 1a, the ferrule 1a as the next product is produced.
will be completed.

On the other hand, when the forming is completed, it is necessary to fix the wire 20 cut at the P position in FIG. 4 to the collet 21 again. This is done by inserting it through the inside of the collet 14a and fixing it to the collet 21 again.

Then, the movable mold plate 15 is placed opposite to the fixed mold plate 14 again by the mold clamping ram 7, and in order to apply tension again to the wire 20 from which the tension has been released,
- First, pull the wire 20 in the direction of the arrow in FIG.
Pressure roller l with a constant tension applied to 0
It is pressurized and fixed via the id and lid in preparation for the next process.

Thus, in this embodiment, the wire 20 is updated every time one molding process is completed, and the through hole of the ferrule is always formed using a new wire.

For this reason, molded products with a constant pore diameter, i.e. -
The next product, ferrule 1a, is obtained.

This facilitates the cutting process by the secondary processing described above, making it possible to obtain the final product easily and at low cost.

(Effects of the Invention) The ferrule manufacturing apparatus according to the present invention has a cavity for injection molding between a fixed side mold plate and a movable side mold plate as described in 1. A wire placement machine Ij4 is provided to place the wire under tension from the direction of the stationary side template! 1
4, it is possible to obtain a ferrule manufacturing apparatus that can always obtain a through hole with high precision and can also perform a post-processing process easily.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a ferrule as a finished product, Fig. 2 is a cross-sectional view of a ferrule manufactured as a primary processed product, Fig. 3 is a cross-sectional view of an embodiment device to which the present invention is applied, and Fig. 4 is a cross-sectional view of a ferrule manufactured as a primary processed product. FIG. 5 is a detailed cross-sectional view of the ejector rod, and FIG. 6 is a conventional ferrule manufacturing device. 1... Ferrule 2... Through hole 3... Fixed platen 4... Male die 5... Female die 6... Movable platen 7... Mold clamping ram 8... Cavity 9... - Pin 10...Mold body 11...Ejector rod 12...Injection nozzle 13...Cooling groove 14...Fixed side template 15...Movable side template 16...Spacer block 20 ... Wire 21 ... Collet 22 ... Spring

Claims (1)

[Claims] 1. A cavity for injection molding provided between a fixed side mold plate and a movable side mold plate, and a tension application within the cavity from the direction of the movable side mold plate to the direction of the fixed side mold plate. A ferrule manufacturing device comprising: a wire placement mechanism for placing a wire that has been placed;