JPH11291270A - Mold for molding resin molded type electric machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject mold high in casting workability and mold maintenance properties by improving a seal structure in order to enhance the vacuum degree in a cavity. SOLUTION: A resin injecting and evacuating gate 58 for evacuating a cavity 56 and injecting a molding resin into the cavity 56 is provided at a position shifted from a split surface 55 in the top surface of a mold to provide a seal packing 57 so as to surround the whole of the cavity 56 and the resin adjusting space 59 adjusting the amt. of a molding resin is provided between the gate 58 and the cavity 56 so as to communicate with the split surface 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding resin-molded electric equipment applied to, for example, a resin-molded instrument transformer for low voltage or high voltage, a resin-molded reactor, and the like. In particular, the present invention relates to means for improving the degree of vacuum of a cavity during casting and the workability of releasing a resin mold device.

[0002]

2. Description of the Related Art FIG. 11 shows, for example, Japanese Patent Publication No. 6-56822.
FIG. 1 is a perspective view showing a molding die of a conventional resin-molded electric device disclosed in Japanese Patent Application Publication No. JP-A-2006-133125. FIG. 12 is a sectional view taken along line AA in FIG. FIG. 13 is a perspective view showing a molded coil molded by the molding die of FIG. In the figure, 1 is a mold for mold splitting on two sides,
Reference numeral 2 denotes a through-hole forming block formed inside the mold 1 for molding, which is a part of a mold for forming a through-hole of a molded coil. 3 is a resin injection port for molding,
Reference numeral 4 denotes a split surface of the molding die 1, 5 denotes a cavity of the molding die 1, 6 denotes a coil portion of a resin molding electric device, 7 denotes a molding resin injected into the molding die, 8 Denotes a molded coil molded by the molding die 1, and 8 a denotes an injection port cured resin portion of the molded coil 8.

FIG. 14 is a cross-sectional view of a conventional molding die disclosed in Japanese Patent Application Laid-Open No. 7-14737, in which a resin is injected from below the die. In FIG. 14, reference numeral 11 denotes a two-part mold, 12 a cavity of the mold 11, 13 a resin injection pipe, 14 an injection port of the resin injection pipe 13,
Reference numeral 15 denotes a vacuum port for evacuating the inside of the cavity 12, 16 denotes a coil portion of a resin-molded electric device, 17
Is a molding resin injected into the molding die 11.

FIG. 15 is a front view showing a conventional resin-molded instrument transformer disclosed in Japanese Utility Model Publication No. 59-15470. 15, reference numeral 24 denotes a resin-molded instrument transformer, 25 denotes a molded coil portion of the resin-molded instrument transformer 24, and 26 denotes a resin-molded instrument transformer 2.
4 is a coil part. Reference numeral 27 denotes a high-voltage coil terminal embedding fitting to which a winding start or end winding lead wire coming out of the high-voltage coil is connected. 28 is a high-voltage terminal screw, 29 is a low-voltage terminal screw, and 30 is an iron core.

In the above description, in the conventional two-sided mold for dies configured as shown in FIGS. 11 and 12, the coil part 6 of the resin mold type electric device is assembled in the cavity 5. After preheating the mold, the mold 1 is placed in a casting tank (not shown), and the interior of the cavity 5 is also evacuated by evacuating the casting tank with a vacuum pump (not shown). Make the same atmosphere. And
A molding resin 7 is injected from a resin injection port 3 provided on the split surface 4 of the mold 1. After the completion of the injection, the molding resin 7 is cured at a temperature and time set in advance, the split surface 4 of the molding die 1 is opened, and the molding coil 8 is taken out of the molding die 1, and the resin molding is performed. The molded coil 8 of the electric device is completed.

Further, as shown in FIG. 14, in a molding die 11 for injecting a molding resin while evacuating the mold alone, in a cavity 12, a coil portion of a resin molded electric device is provided. After the mold 16 is assembled and the mold 11 is preheated, the mold 11 is
Cavity 1 from the vacuum port 15 provided in the upper part of
2 is evacuated, and a molding resin 17 is injected from a resin injection port 14 provided below the molding die 11. After the completion of the injection of the molding resin 17, the molding resin 17 is cured at a preset temperature and time, and the mold coil is taken out of the molding die 11, thereby completing the mold coil of the resin-molded electromagnetic device.

[0007]

In the above-mentioned conventional mold for molding resin-molded electric equipment, a vacuum casting method is used in which a mold is placed in a casting tank, and the tank is evacuated and injected. And a method in which the mold itself is vacuumed and cast. In the mold 11 for molding shown in FIG. 14 in which the resin is injected while vacuum is pulled by the mold alone, the cavity 1 is generally kept in order to maintain the degree of vacuum in the cavity 12.
Although seal packing is used on the split surface of the molding die so as to surround the outer periphery of No. 2, since the resin injection port 14 and the vacuum port 15 are on the split surface of the molding die 11, this portion is used. Cannot be enclosed by seal packing. Therefore, the degree of vacuum in the cavity 12 tends to be incomplete. When casting is performed in a state where the degree of vacuum in the cavity 12 is incomplete, voids remain inside the molded coil. In particular, in a resin molded electric device used at a high voltage or higher, partial discharge is caused by the voids left inside the molded coil. There is a problem that the insulation performance deteriorates. In addition, voids remain on the surface of the molded coil, and there is a problem in appearance.

Further, the molding die 11 has a structure in which the inside of the cavity 12 is evacuated from the upper vacuum port 15 and the resin 17 is injected from the lower injection port 14. In this case, even after the injection, the injection pipe 13 of the injection port 14 cannot be removed until the resin 17 is cured, so that there is a problem that the mass productivity is deteriorated. In addition, since the injection port 14 and the vacuum port 15 are located at different places, there is a problem that the maintainability of the mold is deteriorated.

When the mold coil 25 of the conventional resin-molded instrument transformer shown in FIG. 15 is cast with the mold itself evacuated, the coil portion 26 of the resin mold transformer is incorporated in the cavity. After that, the terminals and embedded metal fittings need to be fixed to the inner wall of the cavity. At this time, from the direction of the high-voltage terminal screw 28 shown in FIG. 15, the high-voltage coil terminal embedding metal fitting 27 is fixed to the top or bottom surface of the cavity using a holder or the like, and the mold disperses after completion of casting. For this purpose, a complicated structure is required, such as using a three-sided die or leaving a die at the terminal portion. In this case, there are problems that the vacuum holding of the mold and the maintainability of the mold, the mold assembling property of the coil portion 26 of the resin mold transformer, the mold releasability of the mold coil 25, and the like are deteriorated. In addition, when the mold itself is evacuated and cast, there is a problem that if the terminals are fixed with a holder from the outside of the mold, the degree of vacuum of the mold cannot be maintained. In the case of a mold fixed with a holder from the outside, there is no other method than placing the mold in the casting tank and evacuating the inside of the tank to perform casting. Was.

In the conventional molding die 1 shown in FIGS. 11 to 13, it is not known which side of the two-part split molding die 1 the mold coil 8 is attached to at the time of mold dispersion after completion of casting. Therefore, there is a problem that it is difficult to release the mold coil 8 by an automatic machine.

A first object of the present invention is to solve the above-mentioned problems. A first object of the present invention is to improve a sealing structure in order to improve the degree of vacuum in a cavity. Is what you get. A second object is to obtain a molding die having a simple configuration by changing the arrangement of terminal embedding metal fittings of a resin molded electric device. A third object is to obtain a molding die capable of automatically releasing by leaving a mold coil in a predetermined die when the die is opened. A fourth object is to improve the arrangement of a vacuum port and a resin injection port, etc., and to obtain a molding die for a resin-molded electric device having high casting workability and high mold maintenance.

[0012]

According to a first aspect of the present invention, there is provided a molding die, wherein a split surface is formed to be perpendicular to a bottom surface of the die and a cavity is evacuated. In the mold for resin-molded electrical equipment, in which the molding resin is injected, the cavity is evacuated,
A resin injection and vacuum evacuation gate for injecting molding resin into the cavity is provided at a position off the split surface on the top surface of the mold, and a seal packing is provided on the split surface of the mold to surround the cavity. And a resin adjustment space for adjusting the amount of molding resin so as to communicate with the split surface between the gate and the cavity.

In the molding die according to the present invention, the injection of the resin into the cavity and the evacuation are performed from the same gate.

In the molding die according to the present invention, a suction-preventing partition wall for protecting the molding resin from entering the vacuum pipe is provided at the entrance of the resin injection gate.

In the molding die according to the present invention, the terminal, the holder, and the like are arranged such that the direction of burying the metal fittings such as the terminal and the holder is the same as the direction in which the die is opened. is there.

A molding die according to the present invention comprises a through-hole forming block for forming a through-hole through which an iron core passes through a molded coil, a holder fixing protrusion provided on the through-hole forming block, and a holder fixing means. A holder insertion groove formed in the projecting portion for use, and a molded product forced fixing holder to be inserted into the holder insertion groove. When the mold is opened, the molded resin-molded electric device is provided with a predetermined metal mold. It is left on the mold side.

In the molding die according to the present invention, the through-hole molding block is provided with a concave groove which works so that a molded product remains on a predetermined die side when the molding die is opened. is there.

The molding die according to the present invention forms an engaging piece which comes into contact with the split surface of one of the two-part molds and is integrally molded with the resin-molded electric device. A forced-fixed block for molding is provided on the split surface of one of the molds so that when the mold is opened, the molded resin-molded electric device remains on the predetermined mold side. Things.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 3 are views showing a molding die of a resin-molded electric device according to Embodiment 1 of the present invention, and FIG. 1 is a perspective view showing the molding die. FIG. 2 is a sectional view of the molding die shown in FIG. FIG. 3 is a cross-sectional view showing a state in which the molding resin is cured in the cavity of the molding die shown in FIG.

In the figure, reference numeral 51 denotes a two-part mold for molding, 51a denotes a mold on the resin injection port side of the mold 51, and 51b denotes a mold on the opposite side of the mold 51a on the resin injection port side. Type. 52 is a resin injection pipe, 52a is a resin injection port of the resin injection pipe 52, 53 is a vacuum evacuation pipe, 53a is a vacuum evacuation pipe evacuation pipe, and 54 is a resin injection port 52a and a vacuum evacuation port 53a integrally formed. It is a casting head. 5
Reference numeral 5 denotes a split surface of the molding die 51, which is formed perpendicular to the bottom surface of the molding die 51. 56 is a cavity of the molding die 51. Reference numeral 57 denotes a seal packing for maintaining the degree of vacuum in the cavity 56 when the inside of the cavity 56 is evacuated.

Reference numeral 58 denotes a route (gate) for injecting resin into the cavity 56 and evacuating, and is a portion generally called a gate. Reference numeral 59 denotes a resin pool for adjusting the variation in sink of the resin at the time of curing the resin, that is,
This is a space for adjusting the amount of injected resin. 60 is a resin injection port 52
This is a suction-preventing partition wall for preventing the resin discharged from a from being sucked into the vacuum outlet 53a. Reference numeral 61 denotes a coil portion of the resin-molded electric device molded into the cavity 56, and 62a denotes a coil portion 6 of the resin-molded electric device.
1, a low-voltage coil-side lead wire, 62b is a high-voltage coil-side lead wire of the coil portion 61 of the resin-molded electric device, 63a is a low-voltage coil terminal embedded metal fitting connected to the low-voltage coil-side lead wire 62a, and 63b is a high-voltage coil-side lead. A high-voltage coil terminal embedded metal fitting connected to the wire 62b. 66 is a molding resin injected into the cavity 56, and 66a is an uncured portion of the molding resin 66 in the gate 58 immediately after the injection is completed. In FIG. 3, reference numeral 66b denotes a coil portion 6 after resin injection.
When the resin 1 is impregnated with the molding resin 66 and cures and contracts, it is a cured contraction resin portion inside the gate 58. 68
Is a molded coil formed by curing the molding resin 66 in the cavity 56 and being integrally formed with the coil portion 61.

In the molding die for a resin-molded electric device configured as described above, the gate 58, which is a resin injection and vacuum evacuation path, of the two-part split molding die 51,
2 is removed from the split surface 55 of the top surface of the molding die 51, and FIG.
As shown in FIG. 7, a gate 58 is provided so as to penetrate the cavity 56 from a position shifted leftward from the split surface 55.
A space 59 for adjusting the amount of injected resin is provided between the cavity and the cavity 56. In addition, injection resin amount adjustment space 5
9 is connected to the split surface 55, and its shape is
The split surface 55 is formed so that the side thereof is larger than the dimension of the gate 58. A seal packing 57 for maintaining the degree of vacuum in the cavity 56 is mounted on the split surface 55 of the resin mold 51 so as to surround the entire cavity 56 and the resin adjustment space 59.

The thus-configured molding die 51 for injecting the molding resin 66 while evacuating the cavity 56, seals the entire cavity 56 with a seal packing 57.
When the cavity 56 is evacuated, there is no vacuum leakage from the split surface 55, and the molding resin 66 can be cast with a stable degree of vacuum. Therefore, it is possible to obtain a resin-molded electric device having excellent insulation characteristics such as partial discharge characteristics.

In the state immediately after the completion of the injection of the molding resin shown in FIG.
8 is not on the split surface 55 of the molding die 51, the mold coil 68 after resin curing has a problem of release.
Immediately after the resin injection is completed, the coil portion 61 is impregnated with the molding resin 66 at the time of injection of the resin, and at the same time, the curing shrinkage also overlaps. The volumes of the gate 58 and the resin adjustment space 59 are determined so that the position of the upper end of the injection port cured resin portion 66b is lowered to a position within the resin adjustment space 59. Therefore, if the position of the upper end of the injection port cured resin portion 66b is lowered as shown in FIG. 3, the resin adjustment space 59 is formed so as to communicate with the split surface 55, so that the mold coil 68 can be released. Become.

Further, since the injection port 52a for injecting the molding resin 66 and the vacuum port 53a for performing vacuum evacuation are provided on the top surface of the mold, the resin injection port 52a of the resin injection pipe 52 can be opened immediately after resin injection. Thus, a mold structure having mass productivity can be obtained.

Further, as shown in FIG.
A casting head 54 provided with a suction-preventing partition wall 60 is provided to prevent the molding resin 66 poured into the gate 8 from a from being sucked into the vacuum outlet 53a. The casting head 54 provided with the suction preventing partition wall 60
Is attached to the top surface of the molding die 51 and casting is performed, so that the molding resin 66 can be injected while evacuating the cavity 56 from the same place of the die as the gate 58, and The maintainability of the mold can be significantly improved. Furthermore, compared to the casting method in which the molding resin is cast from below the mold, the casting time can be reduced,
The mold structure for evacuation can be simplified. In addition,
In the above embodiment, the injection of the resin into the cavity and the evacuation are performed from the gate 8 at the same location. However, the gate for the injection of the resin and the evacuation gate may be separated. is there.

Embodiment 2 FIG. FIG. 4 is a sectional view of a molding die of a resin-molded electric device according to a second embodiment of the present invention. In the figure, reference numeral 64a denotes a low-voltage coil terminal holder for fixing the low-voltage coil terminal embedding fitting 63a to the cavity 56. Reference numeral 64b denotes a high-voltage coil terminal holder for fixing the high-voltage coil terminal embedding fitting 63b to the cavity 56. Low voltage coil terminal holder 6
The 4a and the high-voltage coil terminal holder 64b are screw parts formed of, for example, fluorocarbon resin. Reference numeral 65a denotes a low-voltage coil terminal holder insertion hole formed in the cavity 56 for inserting and fixing the low-voltage coil terminal holder 64a into the cavity 56. Reference numeral 65b denotes a high-voltage coil terminal holder insertion hole formed in the cavity 56 for inserting and fixing the high-voltage coil terminal holder 64b into the cavity 56.

In the above configuration, the coil portion 61 of the resin-molded electric device is assembled into the molding die 51, and at the same time, the low-voltage coil terminal holder 64a and the low-voltage coil terminal holder 64a are inserted into the low-voltage coil terminal embedding metal member 63b. The high-voltage coil terminal holder 64b is screwed into the low-voltage coil terminal holder insertion hole 65a and the high-voltage coil terminal holder insertion hole 65b which are machined in the same direction as the split direction (the left-right direction shown in FIG. 4) of the molding die 51. Low voltage coil terminal holder 64a and high voltage coil terminal holder 64b
Insert and fix and cast.

According to the configuration of the second embodiment, the low voltage coil terminal holder 64a and the high voltage coil terminal holder 6
4b is inserted in the same direction as the split direction of the molding die 51 (the left-right direction shown in FIG. 4) and fixed, so that the moldability of the coil portion 61 of the resin molded electric device and the resin molding die 51 A mold structure having good workability for releasing the mold coil 68 from the terminal can be obtained, and the terminal embedding fittings 63a, 63 can be obtained.
Since 3b is inserted into the inner surface of the cavity 56, the degree of vacuum in the mold is reliably ensured, and a resin-molded electric device having good partial discharge characteristics can be provided.

Embodiment 3 FIG. 5 shows a third embodiment of the present invention, and is a side view of a mold 51 a on a resin injection port side of a molding mold 51. FIG. 6 is a front view of FIG. In the figure, reference numeral 69 denotes a through-hole forming block for forming a through-hole portion through which an iron core (not shown) passes through a molded coil 68 (shown in FIG. 3) of a resin-molded electric device.
Is a holder fixing protrusion provided on the through hole forming block 69, and 69b is a holder insertion groove formed in the holder fixing protrusion 69a. Reference numeral 70 denotes a molded product forced fixing holder that is fitted into the holder fixing projection 69a from the direction of the arrow, and is formed to have a size larger than the width of the through hole forming block 69. Reference numeral 70a denotes a holder fixing groove formed in the molded article forced fixing holder 70. In addition,
In the mold 51b on the opposite side of the mold 51a on the resin injection port side,
A concave fitting hole is machined so that the part where the molded product forced fixing holder 70 is fixed can be fitted into the holder fixing projection 69a.

In the molding die for a resin-molded electric device configured as described above, the coil part 61 is assembled to the molding die 51, and then the molded article forced fixing holder 70 is attached to the holder fixing projection 69a. Fix and cast. When the mold 51 is opened after the casting is completed, the mold 51 is opened.
Molded coil 68 molded inside (shown in FIG. 3)
Always remain in the mold 51a on the resin injection port side of the resin mold 51 by the molded article forced fixing holder 70. The mold coil 68 is released from the mold forcibly fixing the holder 70 upward.

According to the structure of the second embodiment, when the mold 51 is opened, the mold coil can be reliably left in the predetermined mold 51a. Release workability becomes easy. When the mold release is performed automatically, the structure of the equipment can be simplified.

Embodiment 4 FIG. FIG. 7 shows a fourth embodiment of the present invention, and is a side view of a mold 51a on a resin injection port side of a molding mold 51. FIG. FIG. 8 is a front view of FIG. In the drawing, reference numeral 71 denotes a concave groove formed in the through-hole forming block 69, that is, a molded product forced fixing groove.

In the molding die of the resin-molded electric device configured as described above, the coil portion 61 of the resin-molded electric device is assembled into the molding die 51 and cast.
When the molding die 51 is opened, a part of the mold coil 68 (shown in FIG. 3) inside the molding die 51 enters the molded product forced fixing groove 71 and is hardened. The forcible fixing groove 71 is undercut so that the withdrawal resistance is increased, and the molding coil 68 is fixed to the molding die 51.
Always remain on the mold 51a on the resin injection port side. Mold coil 68 cast with resin such as thermosetting epoxy resin
Since the mold is generally released when the resin is not completely cured, the mold is removed from the mold 51a in a soft state so as to be pulled out from the mold 51a.

According to the structure of the fourth embodiment, by providing the molded product forced fixing groove 71 in the through-hole molding block 69, when the resin mold 51 is opened, the mold coil is moved to the predetermined mold 51a. , The mold coil 68 can be easily released from the mold 51. In addition, when the mold release is performed automatically, the structure of the equipment can be simplified.

Embodiment 5 FIG. 9 shows a fifth embodiment of the present invention, and is a side view of a mold 51a on a resin injection port side of a mold 51 for molding. FIG. 10 is a front view of FIG. In the drawing, reference numeral 72 denotes both sides 56a, 5 of the cavity 56 on the split surface 55 of the mold 51a on the resin injection port side.
6b is a pair of molded product forcedly fixed blocks provided symmetrically at positions slightly away from 6b. Numeral 72 a is a molded product forced fixing hole formed in the molded product forced fixing block 72. In this case, the molded product forced fixing block 72 can be fitted into the mold 51b (shown in FIG. 1) on the opposite side of the resin injection port side mold 51a, and the molded product forced fixing hole 72a.
A concave groove (not shown) having the same size as that and communicating with the cavity 56 is provided.

In the resin-molded electric device mold configured as described above, the coil portion 61 is attached to the molding die 51.
Is cast and cast. When the molding die 51 is opened after the casting is completed, a part of the mold coil 68 inside the molding die 51 enters the molded product forced fixing hole 72a formed in the molded product forced fixing block 72 and is cured. doing.
That is, an engaging piece (portion 72a) molded integrally with the resin-molded electric device is formed. Since this engaging piece is in a state of being suppressed by the molded product forced fixing block 72, the mold coil 68 always remains on the side of the mold 51a on the resin injection port side of the molding mold 51. Mold coil 6
When the mold 8 is released from the molding die 51, the resin in the exposed portion between the mold coil 68 and the molded product forced fixing block 72 is cut.

According to the structure of the fifth embodiment, when the mold 51 is opened, the mold coil 68 remains in the predetermined mold 51a without fail.
8 can be easily released from the mold 51. In addition, when the mold release is performed automatically, the structure of the equipment can be simplified.

[0039]

Since the present invention is configured as described above, it has the following effects.

According to the molding die for a resin-molded electric device of the present invention, the split surface is formed perpendicular to the bottom surface of the die by using a two-part mold, and the cavity is formed in a vacuum state. In the mold for resin-molded electrical equipment that injects resin for molding, the cavity is evacuated,
A resin injection and vacuum evacuation gate for injecting molding resin into the cavity is provided at a position off the split surface on the top surface of the mold, and between the gate and the cavity, and on the split surface of the die. Since the resin adjusting space for adjusting the amount of the molding resin is provided so as to lead to the above, the entire cavity can be surrounded by the seal packing. Therefore, when the cavity is evacuated, there is no vacuum leakage from the split surface, and the resin can be cast with a stable degree of vacuum, and a resin-molded electric device having good partial discharge characteristics can be provided.

Further, since the injection of the resin into the cavity and the evacuation are performed from the same gate, there is no need to wait for the resin to harden in the step of opening the resin injection port, and the casting operation is improved. At the same time, the mold structure is simplified.

Also, the embedding direction of the embedding metal fittings such as the terminal and the holder is set in the same direction as the direction in which the mold is opened.
Since the terminals and the holder are provided, a mold structure having good moldability of the coil portion of the resin-molded electric device and workability of releasing the mold coil from the resin-molded mold can be obtained. Is inserted into the inner surface of the cavity, the degree of vacuum in the mold is reliably ensured, and a resin-molded electric device having good partial discharge characteristics can be provided.

Further, a through-hole forming block for forming a through-hole through which an iron core passes through the molded coil, a holder fixing protrusion provided on the through-hole forming block, and a holder formed on the holder fixing protrusion. It has an insertion groove and a molded product forced fixing holder that is inserted into this holder insertion groove, so that when the mold is opened, the molded resin molded electric device remains on the predetermined mold side. In addition, the mold coil can be easily released from the mold. Further, when the mold release is performed automatically, the structure of the equipment is simplified.

Further, the molded product is forcibly fixed to form an engagement piece which comes into contact with the split surface of one of the two molds and is integrally molded with the resin-molded electric device. The block is provided on the split surface of the one mold so that when the mold is opened, the molded resin-molded electric device remains on the predetermined mold side. Release workability from the mold becomes easy. Also,
When the mold release is performed automatically, the structure of the equipment is simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molding die according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the molding die shown in FIG.

FIG. 3 is a cross-sectional view showing a state in which a resin is cured in a cavity of the molding die shown in FIG.

FIG. 4 is a sectional view of a molding die according to a second embodiment of the present invention.

FIG. 5 is a side view for explaining Embodiment 3 of the present invention.

FIG. 6 is a front view of FIG. 5;

FIG. 7 is a side view for explaining Embodiment 4 of the present invention.

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a side view for explaining Embodiment 5 of the present invention.

FIG. 10 is a front view of FIG. 9;

FIG. 11 is a perspective view showing a conventional molding die.

FIG. 12 is a sectional view taken along line AA in FIG. 11;

FIG. 13 is a perspective view showing a molded product molded by a conventional molding die.

FIG. 14 is an explanatory diagram of a molding die in which a resin is injected from below the mold in a conventional molding die.

FIG. 15 is a partially cutaway front view of a conventional resin-molded instrument transformer.

[Explanation of symbols]

51 molding die, 52a resin injection port, 53a vacuum port, 55 split face, 56 cavity, 57 seal packing, 58 gate, 59 resin amount adjustment space (resin pool), 63a low-voltage coil terminal embedding metal fitting,
63b High voltage coil terminal mounting bracket, 64a Low voltage coil terminal holder, 64b High voltage coil terminal holder, 66
Molding resin, 68 molded coil, 69 through-hole forming block, 69a holder fixing protrusion, 70 molded product forced fixing holder, 70a holder fixing groove, 71
Molded product forced fixing groove, 72 Molded product forced fixing block,
72a Molded product forced fixing hole.

Claims (7)

[Claims] 1. A molding die for a resin-molded electric device in which a split surface is formed perpendicular to a bottom surface of the die in a two-part mold, and a cavity is evacuated to inject molding resin. In the above, the cavity is evacuated, and a resin injection and vacuum evacuation gate for injecting the molding resin into the cavity is provided at a position off the split surface of the mold top surface, and A seal packing is provided on the split surface of the mold so as to surround the cavity, and a resin adjustment space for adjusting the amount of molding resin so as to communicate with the split surface is provided between the gate and the cavity. Characteristic mold for molding resin-molded electrical equipment. 2. A molding die for a resin-molded electric device according to claim 1, wherein the injection of the resin into the cavity and the evacuation are performed from the same gate. 3. A molding metal for a resin-molded electric device according to claim 2, wherein a suction-preventing partition for protecting the molding resin from entering the evacuated pipe is provided at the entrance of the gate. Type. 4. The terminal and the holder, etc., wherein the terminal and the holder are arranged so that the embedding direction of the embedding metal fitting such as the terminal and the holder is the same as the direction in which the mold is opened. The molding die for a resin-molded electric device according to any one of the above. 5. A through hole forming block for forming a through hole through which an iron core penetrates a molded coil, a holder fixing protrusion provided on the through hole forming block, and a holder formed on the holder fixing protrusion. An insertion groove and a molded product forced fixing holder to be inserted into the holder insertion groove, so that when the mold is opened, the molded resin-molded electric device remains on a predetermined mold side. The molding die for a resin-molded electric device according to any one of claims 1 to 4, characterized in that: 6. The through-hole forming block is provided with a concave groove which functions so that a molded product remains on a predetermined mold side when the mold for mold opening is opened. The molding die for a resin-molded electric device according to any one of the above. 7. A molded product forcibly fixing block for forming an engagement piece which abuts on a split surface of one of two molds and is integrally molded with a resin mold type electric device. The mold is provided on the split surface of the one mold, and when the mold is opened, the molded resin-molded electric device remains on the predetermined mold side. The molding die for a resin-molded electric device according to any one of claims 1 to 4.