JPH04275121A - Apparatus for molding ferrule - Google Patents

Abstract

PURPOSE:To prevent the breakage of a core and to enhance the accuracy of a molded product in a ferrule molding apparatus. CONSTITUTION:A fixed template 10 is provided between a fixed mounting plate 3 and a mold template 4 so as to freely come into contact with and separate from the mounting plate 3 in such a state that a gap (a) is provided from the mounting plate so as to correspond to the length of the core 1 inserted in a cavity 7. The cavity 7 is formed in a through-hole shape. A molded product release mechanism 6 is equipped with the cavity forming lever 15 inserted and fitted in the cavity 7 in a slidable manner and a core support hole 15a is formed to the cavity forming lever 15. The core 1 is set so that the leading end thereof is arranged at the outlet part 11a of an insertion hole 11. The cavity forming lever 15 is retracted by the injection pressure of a resin while the core 1 is supported in the core support hole 15a at the time of injection and thrusts out a molded product 16 along with a molded product thrusting-out pin 5 at the time of release.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a ferrule molding device, and more specifically, it is capable of preventing breakage of the core that occurs when closing or opening the mold, and improves the accuracy of molded products. The present invention relates to a molding device for a ferrule formed as described above.

0002

2. Description of the Related Art Conventionally, as shown in FIG. 11, this type of device usually has a core 1 attached perpendicularly to the side surface, a fixed side mounting plate 3 on which a sprue 2 is formed, and this mounting plate. a movable side mold plate 4 formed to be able to freely move toward and away from 3 to close and open the mold; and a molded product release device provided on the movable side mold plate 4 and provided with a pin 5 for ejecting the molded product. It is formed from a mechanism 6. In this conventional product, a cavity 7 into which the core 1 is inserted at the axial position when the mold is closed is formed in the movable mold plate 4, and the tip of the core 1 is supported at the bottom of the cavity 7. Pores 8 were formed.

0003

[Problems to be Solved by the Invention] In the above-mentioned conventional product, as shown in FIG. 11B, the above-mentioned core was attached to the above-mentioned mounting plate with the entire core exposed, so that the molding process was difficult. The core is liable to be swayed by the vibrations that sometimes occur, and under such conditions, the movable mold plate moves toward the mounting plate, and the mold is closed. Therefore, when using this type of conventional equipment, for example, when closing the mold, the core was not inserted smoothly into the above-mentioned pores with high accuracy, and the extremely thin and expensive core easily broke. However, since the life of the core is short and replacing the core takes a lot of time and effort, there is a problem in that the maintenance cost of the device is high.

[0004] Furthermore, in the case of conventional products, the resin was injected with the tip of the core supported by the above-mentioned pores. There was a problem that it was difficult to obtain a molded product with good precision as a result.

[0005] Furthermore, in conventional products, the resin was injected into a pre-prepared cavity, which caused the trouble of having to form a gap in the mold to vent the cavity gas (air). The resin injection pressure was also required to be relatively high.

By the way, in the case of this type of molded product, due to its nature, it is not possible to form a draft angle in the molded product to facilitate demolding. However, in the conventional device, as shown in the figure, a pin for ejecting the molded product is placed at a location such as a runner, and the molded product is released from the mold by protruding the runner. When used, there is a problem in that it is difficult to release the molded product from the mold, and as a result, the molded product is easily damaged during the die-cutting operation.

[0007] The present invention aims to solve these problems of conventional products. Therefore, the technical problem of the present invention is to prevent the core from breaking during the molding operation, thereby reducing the maintenance cost of the equipment, and also to prevent the core from deforming due to resin injection pressure, thereby achieving high precision. It is possible to obtain molded products, omit the process of removing cavity gas (air), and use low injection pressure, and it is also possible to improve the yield by making it easier to release the molded products. An object of the present invention is to provide a molding device for a formed ferrule.

[0008]

[Means for Solving the Problems] The present invention takes the following technical means to solve the above problems. That is, in the present invention, in a conventionally known ferrule molding apparatus formed as described above, a fixed side mold is provided which has an insertion hole 11 for the core 1 and a tapered through hole 12 communicating with the sprue 2. The plate 10 is placed between the mounting plate 3 and the movable mold plate 4 with a distance a from the mounting plate 3 corresponding to the length of the core 1 inserted into the cavity 7. It is provided so that it can move toward and away from the camera. Further, the cavity 7 formed in the movable side template 4 is formed in the shape of a transparent hole, and the molded product release mechanism 6 includes a cavity forming rod 15 in which a core support hole 15a for supporting the core 1 is formed.
It is configured with. In the device of the present invention, the core 1 is set to a length such that its tip is disposed at the outlet 11a of the insertion hole 11, and the cavity forming rod 15 is slidably inserted into the cavity 7. However, during injection, the core 1 is supported by the core support hole 15a and retreated by the injection pressure of the resin, and when the mold is released, the molded product 16 can be freely projected together with the pin 5.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. As described above, in the device of the present invention, the core 1 is attached perpendicularly to the side surface, and the fixed side mounting plate 3 on which the sprue 2 is formed moves toward and away from the mounting plate 3 to close and open the mold. It is formed from a movable mold plate 4 that is movable and a molded product release mechanism 6 that is provided on the movable mold plate 4 and includes a pin 5 for ejecting the molded product. In this embodiment, the core 1 is formed in an extended shape at the tip of a core support rod 9, and is attached to the side surface of the mounting plate 3 via the core support rod 9. Note that 5a is a runner ejecting pin as the pin 5 for ejecting the molded product, and 5b is a sprue ejecting pin as the pin 5 for ejecting the molded product.

Reference numeral 7 denotes a cavity into which the core 1 is inserted into the axial position when the mold is closed. This cavity 7 is formed in the movable side mold plate 4 in the shape of a through hole.

[0011] Also, 10 is the above-mentioned mounting plate 3 and movable side template 4.
This is a fixed side template provided between the This stationary template 10 is provided so as to be able to move toward and away from the mounting plate 3 with a distance a from the mounting plate 3 corresponding to the length of the core 1 inserted into the cavity 7 . Further, the fixed side template 10 is formed with an insertion hole 11 for the core 1 and a tapered through hole 12 communicating with the sprue 2. The core 1 is set to a length such that the tip thereof is located at the outlet portion 11a of the insertion hole 11. Note that 13 is a support pin that guides the stationary template 10 and the movable template 4 described above. 14 is this support pin 1
3, and the stationary side mold plate 10 is restricted by this stopper 14 so that it can only move within the range of the distance a.

15 is a core support hole 15 that supports the core 1.
A is the cavity-forming rod. The above molded product release mechanism 6 is formed with this cavity forming rod 15. Further, the cavity forming rod 15 is slidably inserted into the cavity 7, and during injection, supports the core 1 in the core support hole 15a and retreats due to the injection pressure of the resin, and when releasing the mold, the rod 15 is slidably inserted into the cavity 7. It is formed so that the molded product 16 can be freely projected together with the pin 5. 17 is an ejector plate to which the base end of the pin 5 is fixed. The cavity-forming rod 15 is not fixed at its base end to the ejector plate 17;
It is slidably inserted into the cavity 7 described above. 18 is a return pin whose base end is fixed to the ejector plate 17, and 19 is a protruding rod that moves the ejector plate 17 forward and backward.

Next, the operation of this embodiment will be explained. First of all,
When the mold is to be closed, the movable mold plate 4 is guided by the support pins 13 and moves toward the mounting plate 3 from the state shown in FIG. Then, the tip of the cavity forming rod 15 comes into contact with the fixed side template 10, and the core support hole 15a and the insertion hole 11
When they communicate (see FIG. 3), the cavity forming rod 15 is slidably inserted into the cavity 7 as described above, so that the vertical surface of the movable mold plate 4 and the tip thereof are flush with each other. Back up until it's done. Accordingly, the movable mold plate 4 and the fixed mold plate 10 are brought into close contact and integrated (see FIG. 4). Next, in this state, the movable template 4 moves toward the mounting plate 3 together with the fixed template 10, and as a result, the core 1 moves according to the moving distance between the movable template 4 and the fixed template 10. , cavity forming rod 1
It is inserted into the core support hole 15a of No.5. Then, the movable side template 4 is attached to the above-mentioned mounting plate 3 with the fixed side template 10 sandwiched therebetween.
The mold is closed (see Figure 5).

When the mold closing operation is completed, resin injection is started through the sprue 2 (see FIG. 6). After the injected resin flows through the runner, its injection pressure pushes back the cavity forming rod 15 and causes it to retreat (see FIG. 7). When the resin corresponding to the injection amount enters the cavity 7, the cavity forming rod 15 is completely returned (see FIG. 8). In this case, the cavity forming rod 15 is the core support hole 15
A is moved back while supporting the core 1 and forming the cavity 7.

The molded product 16 is cooled and hardened inside the mold,
When removal becomes possible, first, the movable mold plate 4 and the fixed mold plate 10 are separated from the mounting plate 3 while remaining integrated (see FIG. 9). In this case, the stationary template 10 has a stopper 14
Since the movement is limited by the interval a, which is the insertion length of the core 1, the movable side template 4 and the fixed side template 10
When the core 1 is separated from the mounting plate 3, the core 1 is pulled out from the core support hole 15a and the molded product 16.

After that, the movable mold plate 4 is moved back and separated from the fixed mold plate 10, and then the ejecting rod 19 is advanced (see FIG. 1). As a result, the ejector plate 17 is moved forward, and the runner ejector pin 5a, the sprue ejector pin 5b, and the cavity forming rod 15 are ejected, so that the molded product 16 is released from the mold. The molded product 16 is shown in Figure 1.
0, the sprue part 16a and the runner part 1
6b are taken out together.

After the molded product 16 is released from the mold, the rod 19 is retracted (see FIG. 2). As a result, the runner ejector pin 5a, the sprue ejector pin 5b, and the return pin 18 have their base ends fixed to the ejector plate 17, respectively.
are returned to their original positions, and the above cavity forming rod 1
Only 5 is placed in the protruding position.

In the case of the present invention, the above-mentioned distance a may be appropriately selected depending on the length of the molded product 16.

[0019]

[Effects of the Invention] As explained above, in the apparatus of the present invention,
The fixed side mold plate with a core insertion hole formed therein is installed between the fixed side mounting plate and the movable side mold plate with a distance from the mounting plate corresponding to the length of the core inserted into the cavity. The core is provided to be movable toward and away from the plate, and in this case, the core is set to a length such that the tip thereof is disposed at the outlet of the insertion hole. Therefore, in the case of the present invention, the core is protected by the fixed side template and is not easily affected by vibrations, etc.
In addition, since the core can be inserted very close to the core support hole, the core can be inserted with high accuracy, and when opening the mold, the movable side mold plate and the fixed side mold plate are kept in close contact with each other. Since the core can be pulled out by separating it from the mounting plate, it is possible to reduce vibrations that occur during demolding. As a result, by using the device of the present invention, it is possible to prevent the core from breaking when closing or opening the mold, which extends the life of the core and reduces the time and effort involved in core replacement. This has the excellent effect of reducing maintenance costs.

Further, in the device of the present invention, a cavity forming rod is slidably inserted into a cavity formed in a through-hole shape, and during injection, this cavity forming rod supports the core in the core support hole while supporting the resin. It is formed so that it can be freely retracted by the injection pressure. Therefore, in the present invention, since the core is not deformed by the injection pressure of the resin, there is an advantage that a molded product with high precision can be obtained by using this. Further, in the apparatus of the present invention, since the cavity is formed while being formed by the backward movement of the cavity forming rod, the process for venting the cavity gas (air) can be omitted and the injection pressure can be low.

Further, in the present invention, the molded product releasing mechanism is provided with a cavity forming rod, and this cavity forming rod is formed to be able to freely project the molded product together with the above-mentioned pin during mold release. Therefore, if the present invention is used, the molded product can be directly ejected using the cavity forming rod.
There are advantages in that the molded product can be easily demolded, and as a result, damage to the molded product that occurs during demolding work can be prevented, and the yield of the molded product can be improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an operation when ejecting a molded product, showing a preferred example of the present invention.

FIG. 2 is an operation explanatory diagram showing a state before the mold closing operation.

FIG. 3 is an explanatory diagram of the operation during the mold closing operation.

FIG. 4 shows the state at the start of core insertion, A is the overall view;
B is an enlarged view of the main part.

[Fig. 5] Shows the state when the mold closing operation is completed, A is the overall view,
B is an enlarged view of the main part.

FIG. 6 is an operation explanatory diagram showing a state at a stage when resin injection has started.

FIG. 7 is an operation explanatory diagram showing a state in the middle of resin injection.

FIG. 8 is an explanatory diagram of the operation when resin injection is completed.

FIG. 9 is an operation explanatory diagram showing a state in which the mold opening has started and the core has been pulled out.

FIG. 10 is a perspective view showing the state of the molded product.

FIG. 11 shows a conventional device, in which A is an explanatory diagram of the operation when the mold is closed, B is an explanatory diagram of the operation showing the state after the mold is opened and before the molded product is ejected, and C is an enlarged view of the main part when the mold is closed.

[Explanation of symbols]

1 Core 2 Sprue 3 Fixed side mounting plate 4 Movable side template 5. Pin for ejecting the molded product 6 Molded product release mechanism 7 Cavity 10 Fixed side template 11 Insertion hole 11a Exit part 12 Through hole 15 Cavity forming rod 15a Core support hole 16 Molded products a Interval

Claims (1)

[Claims] Claim 1: A fixed-side mounting plate on which a core is attached orthogonally to the side surface and a sprue is formed, and a movable side that is formed to move toward and away from the mounting plate to freely close and open the mold. It consists of a mold plate and a molded product release mechanism provided on the movable mold plate and equipped with a pin for ejecting the molded product, and the cavity into which the above-mentioned core is inserted into the axial position when the mold is closed is In a ferrule forming device formed on a movable side template, a fixed side template is formed with an insertion hole for the core and has a tapered through hole that communicates with the sprue, and is connected to the mounting plate on the movable side. It is provided between the mold plate and the above-mentioned movable side mold plate so as to be able to move toward and away from the mounting plate with a distance from the above-mentioned mounting plate equal to the length of the core to be inserted into the cavity. The molded product releasing mechanism includes a cavity forming rod in which a core support hole for supporting the core is formed, and the tip of the core is formed in the exit of the insertion hole. A cavity-forming rod, which is set to a length to be placed in the section and is slidably inserted into the above-mentioned cavity, retreats by the injection pressure of the resin while supporting the core in the above-mentioned core support hole during injection. , a molding device for a ferrule that can freely protrude the molded product together with the above-mentioned pins during mold release.