JP3427274B2 - Resin mold - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention shares one mold body for transfer molding or injection molding,
The present invention relates to a resin molding die that molds a resin molding having the same shape from a thermosetting or thermoplastic synthetic resin with the same mold.

[0002]

2. Description of the Related Art Conventionally, when molding a resin molded product, a thermosetting synthetic resin is applied by transfer molding, and a thermoplastic synthetic resin is injection molding by a specialized molding die. It is usually molded individually. However, in this case, since the molding die is required individually, the die cost is high and the individual maintenance and management are required, and the cost required therefor accounts for a large proportion of the product cost.

When a synthetic resin suitable for forming a desired resin molded product is selected from either thermosetting or thermoplastic, different synthetic resin materials are used to obtain appropriate comparison data. However, it is desirable to experimentally obtain a resin molded product having exactly the same shape and use it as a sample. In order to obtain this sample with individual molding dies, it is required that the cavity portions of the respective molding dies be precisely machined into the same shape.

When this trial mold is individually prepared,
The cost already increases at the stage of obtaining the comparison data. Especially, in the current situation where many products are formed of thermoplastic synthetic resin, that is, so-called thermoplasticization is required, a synthetic resin suitable for forming a desired resin molded product is prepared from a wide variety of synthetic resins. In order to select, it is desirable to be able to select at low cost and quickly.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a resin molded product having the same shape can be molded from a thermosetting or thermoplastic synthetic resin at a low cost. In particular, a resin molded product made of the synthetic resin can be molded. It is an object of the present invention to provide a resin molding die which is improved so as to quickly obtain the comparative data of 1. at low cost.

[0006]

According to a first aspect of the present invention, there is provided a resin molding die, which comprises one die body having an internal space of a predetermined shape as a cavity portion, and the die body is combined with the die body to form a transfer pot. And a resin injection machine having a spool bush connected from a resin injection nozzle, and one mold body is transfer molded,
It is also used for injection molding, and molds the same shaped resin molded product from the same thermosetting or thermoplastic synthetic resin with the same mold. Inserts the spacer ring that holds the transfer pot and the resin injection nozzle. The transfer ring has a retaining ring for holding the transfer pot, and a peripheral side surface of the spool bush and a peripheral side surface of the spool bush are formed in a common shape. A spacer ring or a spacer ring that fits and inserts a spacer ring or a locate ring from a spool bush into the mold body from the end of the pot, and attaches and detaches the resin extruder and resin injection machine to the receiving portion of the mold body. It is configured by installing a replaceable ring.

In the resin molding die according to the second aspect of the present invention, the fixed die and the movable die which form the cavity are mainly used, and the back plate fixed to the fixed die and the fixed fixed to the back plate. A side mounting plate is provided, and an opening near the tip of the transfer pot or the spool bush is inserted continuously from the plate surface of the back plate into the fixed mold, and the transfer ring is inserted from the recess into which the spacer ring or locate ring is fitted. The mold body is provided with an opening for receiving the middle part of the pot or inserting the tip side of the resin injection nozzle in communication with the plate surface of the fixed side mounting plate, and the resin extruder and the resin injection machine are provided in the mold body. A spacer ring or a locate ring that is attached to and detached from the recess is provided so as to be replaceable.

In the resin molding die according to the third aspect of the present invention, the flange portion having the same shape is provided so as to project from the peripheral side surface of the transfer pot and the peripheral side surface of the spool bush, and the concave portion for receiving the flange portion is opened. Provided in a fixed type so as to communicate with the section, and further, a key and a key groove that mesh with each other are provided separately on the inner surface of the opening, near the tip of the transfer pot and near the tip of the spool bush, and the transfer pot or spool bush is the key. And the key groove are engaged with each other to prevent rotation inside the opening, and the flange and the recess are fitted to each other to be positioned so that they can be inserted into the fixed mold.

[0009]

With the resin molding die according to the first aspect of the present invention, transfer molding or injection molding can be performed with the same mold, so that the costs associated with mold cost maintenance and management can be greatly reduced. Further, when performing a trial production of selecting a suitable synthetic resin from a wide variety of synthetic resins, a resin molded product having the same shape is formed in the cavity portion under the same conditions even if the synthetic resin has different thermosetting and thermoplastic materials. Therefore, accurate comparison data can be quickly obtained at low cost.

In the resin molding die according to claim 2 of the present invention,
The opening near the tip of the transfer pot or the spool bush is inserted continuously from the plate surface of the back plate into the fixed mold, and the intermediate part of the transfer pot is received from the recess into which the spacer ring or locate ring is fitted. Alternatively, a spacer ring is provided which includes a mold body provided with an opening for inserting the tip side of the resin injection nozzle in communication with the plate surface of the fixed-side mounting plate, and which attaches and detaches the resin extruder and the resin injection machine to the concave portion of the mold body. Alternatively, since the locate ring is provided so as to be exchangeable, one mold body can be configured to be commonly used for transfer molding and injection molding without significantly changing the mold structure.

In the resin molding die according to claim 3 of the present invention,
A flange portion of the same shape is provided so as to project from the peripheral side surface of the transfer pot and the peripheral side surface of the spool bush, and a concave portion for receiving the flange portion is provided in a fixed mold in communication with the opening portion. The key groove is provided separately on the inner surface of the opening, near the tip of the transfer pot and near the tip of the spool bush, and the transfer pot or the spool bush is locked inside the opening by the engagement of the key and the key groove, and Since the flange portion and the recess portion are fitted to each other to be positioned so as to be provided so as to be insertable into the fixed mold, the transfer pot can be stably provided, and the spool bush can be securely connected to the resin injection nozzle.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, referring to the attached drawings, the illustrated embodiment shows a resin molding die using a transformer bobbin as a resin molding. In this resin molding die, the mold body 1 is used for both transfer molding and injection molding, and the mold body 1 is combined with the resin molding machine 2 for transfer molding and the resin injection machine 3 for injection molding. It is composed of replaceable equipment. Regarding the mold structure of the mold body 1, mainly,
This will be described with reference to FIG.

The mold main body 1 mainly comprises a fixed mold 10 and a movable mold 11 required for molding and removing the transformer bobbin. In addition to this, each mold part such as the fixed insert 10a and the movable insert 11a is provided. Inside the die body 1, a cavity portion 12 forming a transformer bobbin is provided. The cavity portion 12 is the winding shaft portion b of the coil.
Bobbin B consisting of ₁ , terminal block b ₂ and collar b ₃ (see FIG. 1).
It is shown in the interior space. ) Is formed as an internal space of a predetermined shape that can be integrally molded.

FIG. 1 shows a case where a transformer bobbin is transfer molded from a thermosetting synthetic resin by a resin extruder 2. The resin extruder 2 inserts a thermosetting resin tablet T into the transfer pot 20 and causes the tablet T to be heated and melted by a heater and flown into the cavity 12 of the mold body 1 by the pressing force of the plunger 21. It is equipped to mold resin molded products.

FIG. 2 shows a case where a bobbin for a transformer is injection-molded by a resin injection machine 3 from a thermoplastic synthetic resin. Since the resin injection machine 3 presses the thermoplastic molten resin E with the screw 32 and flows into the cavity portion 12 of the mold body 1 via the spool bush 30 near the tip of the resin injection nozzle 31, the resin molded product is molded. Equipped to do.

The fixed die 10 is assembled with a back plate 10b and a fixed side mounting plate 10c. The back plate 10b is detachably tightened and fixed to the fixed die 10 with bolts 13. The fixed side mounting plate 10c is
It is detachably attached to the back plate 10b by a fixing means (not shown).

The movable die 11 is clamped by inserting the guide pin 14a, which is erected and fixed on the fixed die 10, into the guide pin bush 14b, and inserting the guide pillar 15 provided in the movable die 11 into the fixed die 10. Further, it is combined with the fixed mold 11 so that the mold opening guide can be freely moved. This resin mold is equipped with necessary accessory equipment such as an ejector pin 16 whose tip side is omitted in the drawing.

In addition, the fixed mold 10 is provided with a spool 10d and a gate 10e so that the molten resin flows into the cavity portion 12 from the tip end side of the transfer pot 20 or the spool bush 30 as shown in FIG. The fixed die 10 has a receiving portion 17 which can be attached and fixed by replacing the resin extruder 2 and the resin injection machine 3, respectively.
It is provided so as to be substantially continuous from 0c into the mold of the fixed mold 10.

As the receiving portion 17, the transfer pot 20 of the resin extruder 2 is fitted and inserted near the front end, and the spool bush 30 of the resin injection machine 3 can be fitted and opened.
a and 17b are provided so as to continue from the back plate 10b to the fixed mold 10. At the same time, an opening 17c is formed in the fixed side mounting plate 10c for receiving the intermediate portion of the transfer pot 20 and for inserting the tip side of the resin injection nozzle 31 connected to the spool bush 30.

As shown in FIG. 4, the transfer pot 20 is provided with a flange portion 22 for positioning and inserting the transfer pot 20 in a concave portion of the fixed mold 10 described later so as to project from the peripheral side surface. In addition, a key groove 23 that engages with a key to be described later is provided closer to the tip than the flange portion 22 of the transfer pot 20.

As shown in FIG. 5, the spool bush 30 has a collar portion 22 and a key groove 2 of the transfer pot 20.
A flange 33 and a key groove 34, which have the same shape as those of the reference numeral 3, are provided from the middle side toward the tip. The collar portion 33 and the key groove 3
By providing 4, the circumferential surface of the spool bush 30 is formed in the same shape as the tip of the transfer pot 20.

The fixed mold 10 (see FIG. 3) includes a transfer pot 20 or a collar portion 22 of a spool bush 30,
A recess 17d for receiving 33 is provided as a part of the receiving portion 17 so as to be continuous with the opening 17a. A key 10f that engages with the key grooves 23, 34 is provided on the inner surface of the opening 17a. The above-described opening 17b is formed so that the flanges 2 of the transfer pot 20 and the spool bush 30 are fitted to the peripheral side surfaces of the spool bush 30 rearward of the flanges 22 and 33.
It is provided on the plate surface of the back plate 10b that presses 2, 33 from behind.

The resin extruder 2 (see FIG. 1) is provided with a spacer ring 24 for inserting and holding the transfer pot 20, and the spacer ring 24 is provided in a recess 17e provided in the fixed side mounting plate 10c as a part of the receiving portion 17. Since it is fitted and tightened and fixed by the bolt 18, it is detachably attached to the mold body 1.

The resin injection machine 3 (see FIG. 2) is provided with a locate ring 35 for inserting and holding the resin injection nozzle 31, and the locate ring 35 is provided in the recess 17 of the fixed side mounting plate 10c.
bolt 18 which is fitted to e and is common to the spacer ring 24
The resin injection nozzle 31 is detachably attached to the mold main body 1 because the resin injection nozzle 31 is fastened and fixed. The locate ring 35 has a peripheral side surface formed in the same shape as the spacer ring 24 of the transfer pot 20.

In the resin molding die thus constructed, one mold body 1 is used for both transfer molding and injection molding, and the transformer bobbin B having the same shape as the resin molding is either thermosetting or thermoplastic. Synthetic resin T, E
It can be applied to form in the cavity portion 13. Therefore, the mold cost, the mold maintenance cost, and the management cost can be significantly reduced. In particular, when performing a trial production of selecting a suitable synthetic resin from a wide variety of synthetic resins, it is possible to form a resin molded article of the same shape from the synthetic resin by transfer molding or injection molding in the common cavity portion 13. Therefore, accurate comparison data can be obtained quickly.

In the resin molding die, when the resin extruder 2 and the resin injection machine 3 are exchanged with each other, for example, when the resin extruder 2 is replaced with the resin injection machine 3, the bolt 18 is removed to remove the spacer ring 24. Transfer pot 2
If the fixed side mounting plate 10c and the back plate 10b are removed from the fixed mold 10, the transfer pot 20 can be removed from the fixed mold 10 and the resin extruder 2
Can be removed from the mold body 1.

Instead of the resin extruder 2, a resin injection machine 3
To connect the mold to the mold body 1, first, the spool bush 3
0 is inserted into the opening 17a of the fixed mold 10. The spool bush 30 can be installed by positioning the collar 33 in the recess 17d of the fixed mold 10 and the key 10f of the fixed mold 10 in the key groove 34 so that the spool bush 30 is positioned in the fixed mold 10. Also, the back plate 10b and the fixed side mounting plate 10c
Is fixed to the fixed die 10 and the collar 33 is pressed by the back plate 10b, so that the spool bush 30 can be securely inserted and fixed.

After that, the locate ring 35 is fitted into the recess 17e of the fixed-side mounting plate 10d and is tightened and fixed by the bolt 18, because the locate ring 35 is formed in the same shape as the spacer ring 24 of the transfer pot 20. The locate ring 35 can be securely assembled and fixed in the recess 17e of the fixed side mounting plate 10d. Further, if the resin injection nozzle 31 is inserted into the locate ring 35, it can be connected to the spool bush 30 and securely mounted. It should be noted that when the resin injection machine 3 is replaced with the resin extrusion machine 2, the above procedure may be reversed.

In the above-mentioned embodiment, the bobbin B for the transformer is exemplified as the resin molded product, but other than that, it is widely applied to form various resin molded products from the thermosetting or thermoplastic synthetic resin. it can.

[0030]

As described above, according to the resin molding die of the present invention, since one mold body is used for both transfer molding and injection molding, it is necessary to maintain and manage the mold cost. Cost can be reduced. Further, a trial production of selecting a thermosetting or thermoplastic synthetic resin for molding a desired resin molded product can be performed quickly at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a case where a resin molding die according to the present invention is applied to transfer molding.

FIG. 2 is an explanatory view showing a case where the same molding die is applied to injection molding.

FIG. 3 is an explanatory view showing an enlarged part of the molding die.

FIG. 4 is an enlarged view showing a portion of a transfer pot near the tip of the same molding die.

FIG. 5 is an enlarged view showing a spool bush provided in the mold.

[Explanation of symbols]

Type 1 body 12 Cavity part 17 Receiver 2 resin extruder 20 transfer pots 24 Spacer ring 3 resin injection machine 30 spool bush 31 Resin injection nozzle 35 locate ring B Resin molded product T, E synthetic resin

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 45/00-45/03, 45/26

Claims (3)

(57) [Claims] 1. A cavity portion (1
2) which is provided with one mold body (1), is paired with the mold body (1), and is connected to a resin extruder (2) having a transfer pot (20) through a resin injection nozzle (31). A resin injection machine (3) having a spool bush (30) is provided, and one mold body (1) is commonly used for transfer molding and injection molding, and is made of the same shape from a thermosetting or thermoplastic synthetic resin. A resin molding die for molding a resin molded product with the same mold, comprising a spacer ring (24) for inserting and holding a transfer pot (20) and a locate ring (35) for inserting and holding a resin injection nozzle (31), The tip end of the transfer pot (20) and the peripheral side surface of the spool bush (30) are formed in a common shape, and the peripheral side surface of the spacer ring (24) is located. A peripheral ring of the ring (35) is formed in a common shape, and the locate ring (35) can be fitted and inserted from the tip of the transfer pot (20) toward the spacer ring (24) or the spool bush (30). Two receiving parts (17) are provided on the mold body (1),
The resin extruder (2) and the resin injection machine (3) are connected to the mold body (1).
A resin molding die, which is replaceably provided with a spacer ring (24) or a locate ring (35) that is attached to and detached from the receiving portion (17) of the. 2. A fixed mold (10) mainly comprising a fixed mold (10) forming a cavity (12) and a movable mold (11).
A back plate (10b) mounted and fixed to the back plate (10b) and a fixed side mounting plate (10c) mounted and fixed to the back plate (10b) are provided, and the end of the transfer pot (20) or the spool bush (30) is inserted. The openings (17a, 17b) are provided continuously from the plate surface of the back plate (10b) into the fixed mold (10), and
Spacer ring (24) or locate ring (35)
From the recess (17e) into which the transfer pot (2
0) Accepting the middle part or resin injection nozzle (31)
A resin mold extruder (2) and a resin injection machine (3) are provided with a mold body (1) provided with an opening (17c) for inserting the front end side of the mold in communication with the plate surface of the fixed side mounting plate (10c). Spacer ring (2) for attaching and detaching the and
4. The resin molding die according to claim 1, wherein the resin molding die is provided so as to be replaceable with 4) or a locate ring (35). 3. The flange portions (22, 33) of the same shape are provided so as to project from the peripheral side surface of the transfer pot (20) and the peripheral side surface of the spool bush (30), and the flange portions (22, 33) are formed. A recess (17d) for receiving is provided in the mold of the fixed mold (10) so as to communicate with the opening (17a), and the key (10f) and the key groove (23,
34) with the inner surface of the opening (10a) and the tip of the transfer pot (20), and the spool bush (30).
The transfer pot (2
0) or spool bush (30) key (10f)
And the keyway (23, 34) are engaged with each other, the opening (17
It is fixed inside the fixed mold (1) by turning it inside of (a) and positioning it by fitting it into the flanges (22, 33) and the recesses (17d).
0) is provided so that it can be inserted.
The resin molding die according to.