JPH06226760A - Mold device for casting coil - Google Patents

Abstract

PURPOSE:To obtain an electrically excellent casting coil without generating a sink or release at the interface of an insulating spacer and a casting resin by eliminating the temp. difference with the periphery of an insulating spacer for providing a predetermined gap between a mold and a conductor. CONSTITUTION:A heat source 11 supplying heat to an insulating spacer 4 or a built-in insulating spacer support pin 6b is used to immediately supply heat from the point of time when the insulating spacer 4 is attached and a casting resin is injected while the temp. of the insulating spacer 4 and the peripheral temp. are held to the same temp. to be cured. After the completion of curing, an insulating spacer support pin 6b and a knock-out pin 6a are simultaneously raised to take out a product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device for manufacturing a casting coil in which a conductor is embedded in a casting resin.

[0002]

2. Description of the Related Art FIGS. 3a and 3b show, for example, Japanese Patent Application No. Hei 3-2163.
FIG. 34 is a cross-sectional view showing an insulating spacer arrangement state of the conventional casting coil mold device shown in FIG. 33, in which 1 is a conductor, 2 is a molding part, 3 a is a mold, 3 b is a whole through the mold 3 a. Heat plate 4 for supplying heat to the insulating spacer 4 for providing a predetermined gap between the mold 3a and the conductor 1, 5 is a bush, 6 is a knockout device for taking out a product, and a knockout pin 6a And an insulating spacer support pin arranged at the center of the insulating spacer support pin so as to be movable in the vertical direction relative thereto. 7 is a vacuum chamber for evacuating the fitting portion between the bush 5 and the knockout pin 6a, 8
Is an O-ring.

Next, the operation will be described. The mold 3a receives heat from the hot plate 3b and is heated to a predetermined temperature, the heat conduction from the mold 3a heats the bush 5 and the knockout pin 6a, and the molding unit 2 further radiates these. Is being heated by. Under such a condition, first, the knockout pin 6a is raised to the molding portion 2. At this time, the insulating spacer support pin 6b, on the contrary, descends to a predetermined level at which the insulating spacer 4 does not fall or fall.
After the insulating spacer 4 is attached to the insulating spacer support pin 6b, the conductor 1 which is preheated to a predetermined temperature outside in advance is set (FIG. 3a). After that, knockout pin 6
a is lowered until it is flush with the surface of the molding portion 2, and when this knockout pin 6a is lowered, the insulating spacer support pin 6b is raised until it is flush with the mold 3a and the knockout pin 6a. The conductor 1 and the mold 3a are kept in a predetermined gap by the insulating spacer 4 (FIG. 3b). The insulating spacer 4 is heated by heat conduction from the conductor 1 and the insulating spacer support pin 6b, and further by radiation. When the constant preheating time is completed, the molding unit 2 and the vacuum chamber 7 are kept at the same vacuum and the casting resin is filled from the injection port at the bottom. After the filling in the molding part 2 is completed, a predetermined curing is performed, and then the knockout pin 6
At the same time, the insulating spacer support pin 6b is lifted, the casting coil is taken out from the molding unit 2, and the series of operations is completed.

[0004]

The conventional casting coil has been manufactured as described above, but the conductor preheated to a predetermined temperature outside the coil does not come out during movement until it is set in the mold. It is significantly cooled by the air temperature, or a small gap is generated between the bush and the knockout pin because the O-ring is attached, and it is difficult for the knockout pin, the insulating spacer support pin and the mold to have the same temperature. Further, since the knockout pin is connected to the driving unit outside the mold system, heat is radiated greatly, and as a result, the temperature of the insulating spacer support pin is further lowered. Further, the surface of the insulating spacer is usually provided with unevenness by blast treatment or the like in order to improve the adhesive strength with the casting resin,
In some cases, the contact area between the insulating spacer support pin head surface and the insulating spacer is extremely small. For this reason, it is difficult to always raise the temperature of the insulating spacer to a stable predetermined temperature under a constant preheating time, and the temperature of the insulating spacer is greatly affected by the temperature of the external atmosphere. There is a problem that a state extremely low with respect to the temperature occurs, and when the injected casting resin gels, a sink mark or peeling occurs at the interface between the insulating spacer and the casting resin. As described above, the phenomenon of inferior partial discharge characteristics and withstand voltage characteristics occurred, and the yield rate was not improved.

The present invention has been made to solve the above problems, and an object thereof is to obtain an electrically excellent casting coil without causing a significant temperature difference between the insulating spacer and the surroundings. To do.

[0006]

The casting coil mold apparatus according to the present invention is provided with a heating heater and a waveguide for transmitting microwaves in the insulating spacer support pin, so that the insulating spacer is supported by the insulating spacer support pin. Heat is supplied to prevent a temperature difference between the insulating spacer and the surroundings.

[0007]

The casting coil mold device according to the present invention supplies heat to the insulating spacer from a heating source built in the insulating spacer support pin, and the insulating spacer is kept at the same temperature as the surroundings within a certain preheating time. As a result, it is possible to manufacture a casting coil having excellent partial discharge characteristics and withstand voltage characteristics without causing sink marks or peeling at the interface between the insulating spacer and the casting resin as in the conventional case.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the same parts as those in the above-mentioned conventional technology are designated by the same reference numerals. Reference numeral 9 is a metallic support pin head mounted on the upper head portion of the insulating spacer support pin 6b via a heat insulating material 10, and 11 and 12 are a heater and a temperature sensor built in the support pin head. The rest of the configuration is the same as the conventional example.

Next, the operation will be described. First, mold 3
a is supplied with heat from the hot plate 3b and heated to a predetermined temperature, and by this heat conduction, the bush 5, the knockout pin 6a, the insulating spacer support pin 6b, the support pin head 9 and the like are heated, and the molding portion 2 is radiated by these. It is heated.
At this time, the temperature of the supporting pin head 9 is always detected by the built-in temperature sensor 12, and the heater 11 is operated so that the temperature is the same as that of the mold 3a. Next, the knockout pin 6a is raised to the molding portion 2, but at this time, the insulating spacer support pin 6b (in which the support pin head 9 and the heat insulating material 10 are also integrated) does not cause the insulating spacer 4 to fall or drop. Descend to the level. In this state, the knockout pin 6a and the insulating spacer support pin 6b are supplied with heat by the heat conduction from the mold 3a, but the heat is also radiated significantly. Heat is constantly supplied by 11. Therefore, the insulating spacer 4 is attached later, but the supporting pin head 9 portion at this time is always kept at the same temperature as the mold 3a by the above heating, and the heat supply to the insulating spacer 4 is immediately started. . After that, the conductor 1 preheated to a predetermined temperature outside is set, and the knockout pin 6a is lowered until it becomes flush with the molding portion 2 surface. When the knockout pin 6a is lowered, the insulating spacer support pin 6b is raised until it is flush with the mold 3a and the knockout pin 6a. After a certain preheating time, while maintaining the molding unit 2 and the vacuum chamber 7 at the same vacuum, the casting resin is filled from the injection port at the bottom, and after the filling in the molding unit 2 is completed, a predetermined curing is performed. To do. In these series of processes, heat is constantly supplied to the insulating spacer 4. After the curing is completed, the knockout pin 6a and the insulating spacer support pin 6b are simultaneously raised, and the casting coil is taken out from the molding section 2 to complete a series of operations.

Embodiment 2. Next, a casting coil mold according to the second embodiment will be described with reference to FIG. In FIG. 2, 13 is a support pin head made of quartz glass, and 14 is a waveguide for transmitting microwaves built in the support pin head 13 and the insulating spacer 6b. Although not shown in the drawing, a device such as a microwave oscillator (magnetron) is attached to the end of the waveguide 14. Other configurations are the same as those in the first embodiment.

Next, the operation will be described. A series of operations are almost the same as those in the first embodiment. After the insulating spacer 4 is attached to the insulating spacer support pin head 13, microwaves are applied to the insulating spacer 4 under previously adjusted conditions, so that the spacer 4 is heated from the inside and rises to a predetermined temperature. In the case of the first embodiment, heat is supplied to the insulating spacer 4 from the outside, but in the case of microwave heating of this embodiment, since the heating is performed from the inside of the insulating spacer 4, the heat storage (heat retention) effect is high. . Although the quartz glass support pin head is used in the present embodiment, the same effect can be obtained by using other ceramics instead of quartz glass.

Embodiment 3. In the first and second embodiments, the insulating spacers 4 are directly installed on the support pins 6b. However, for example, the surface of the support pin head shown in FIG. When a rubber-based polymer layer filled with metal powder or carbon powder is provided,
The interface between the surface of the insulating spacer support pin and the insulating spacer comes into very close contact, and heat is supplied to the insulating spacer very efficiently. The substance to be applied to the surface of the supporting pin head may be any substance that is rich in thermal conductivity and elasticity, and is not limited to the above.

[0013]

As described above, according to the present invention, the heat can be continuously supplied to the insulating spacers, so that the insulating spacers and the surroundings are always kept at the same temperature. There is an effect that an electrically excellent casting coil can be obtained without causing peeling or sink marks at the interface with the casting resin.

[Brief description of drawings]

FIG. 1 is a sectional view showing a mold device for a casting coil according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a mold device for a casting coil according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a conventional casting coil mold, in which a is the installation state of insulating spacers and conductors outside the molding portion, and b is the installation heating state of insulating spacers and conductors inside the molding portion. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 conductor 2 molding part 3a mold 4 insulating spacer 6 knockout device 6a knockout pin 6b insulating spacer support pin 9 metal support pin head 10 heat insulating material 11 heating heater 13 quartz glass support pin head 14 waveguide

Claims (4)

[Claims] 1. A metal having a degassing port in the upper part, a molding part for injecting resin from a bottom injection port to mold it into a predetermined shape, and a knockout device for moving up and down to knock out a product. A mold, in which an insulating spacer for arranging a predetermined gap between the mold and the conductor is arranged, a heat supply means for heating the insulating spacer to the insulating spacer supporting portion of the knockout device. A mold device for a casting coil, comprising: 2. A metal supporting pin head is provided above the insulating spacer supporting pin via a heat insulating material as a heat supplying means to the insulating spacer, and a heating heater is provided in the supporting pin head. 1. The mold device for casting coil according to 1. 3. As a means for supplying heat to the insulating spacer, a ceramic support pin head is provided above the insulating spacer support pin via a heat insulating material, and a microwave transmission waveguide is provided in the support pin head. The mold apparatus for a casting coil according to claim 1. 4. The mold device for a casting coil according to claim 1, wherein the surface of the insulating spacer supporting pin head is provided with a material having excellent thermal conductivity and rich elasticity.