JPS5839866Y2 - mold for molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold for molding, and particularly to a mold for pressurized gelling molding in which a liquid resin containing a hardening agent is injected into a cavity under pressure and molded.

Generally, resin mold casting is a technique in which a resin containing a hardening agent is injected under pressure into a mold cavity, the resin is gelled, and then cured to obtain a molded product.

In this type of casting operation, when liquid resin is injected into the cavity from the injection port under pressure, it is necessary to exhaust the air in the cavity. A vent is provided.

On the other hand, if this degassing port is left open, the resin injected under pressure into the cavity may overflow from the degassing port, or the resin in the cavity may be kept at a specified level until the resin in the cavity gels. This means that it cannot be pressurized with pressure.

Therefore, conventionally, immediately after degassing the air inside the cavity,
The deaeration port was temporarily closed by a closing device, and the closed state was maintained until the resin gelled in the cavity.

For this reason, a device for closing the deaeration port must be provided separately from the mold, and a process of installing and removing the closing device must be added during the molding process, which improves the efficiency of the molding operation. was causing a decline in

Therefore, an object of the present invention is to provide a molding die that eliminates the need for a degassing port by providing an air reservoir inside the mold that communicates with the cavity, thereby streamlining the molding operation.

In order to achieve the above object, the present invention is characterized in that an air reservoir communicating with the cavity is provided inside the mold.

Embodiments of the molding die according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a mold, and this mold 1 consists of two mold members 3 and 4 that can be divided along the mold mating surface 2. A cavity 5 having a desired shape is formed inside the mold 1.

An injection port 6 communicating with the cavity 5 is provided below the mold 1, and a liquid epoxy resin containing a hardening agent is injected into the cavity 5 under pressure from the injection port 6.

On the other hand, inside the mold 1, an air reservoir 7 is provided which communicates with the cavity 5, and the size of the air reservoir 7 is appropriately determined in consideration of the volume of the cavity and the like.

According to one embodiment of the present invention configured in this manner, the resin injected into the cavity 5 from the injection port 6 under pressure is discharged while the air in the cavity 5 is discharged from the mating surface 2 of the mold to the outside. A portion of the resin fills the cavity 5 and is also introduced into the air reservoir 7.

However, during this time, the air that has not been completely discharged from the mating surface 2 of the mold 1 becomes bubbles and collects in the upper part of the cavity 5, and finally into the air reservoir 7.

While this state is maintained, the resin can be gelled.

Therefore, according to the present invention, there is no need to provide a deaeration port unlike the conventional ones, and there is no need to separately provide a device for closing the deaeration port and the trouble of installing and removing it. The work process can be simplified.

FIG. 3 shows another embodiment of the present invention, and this embodiment is suitable for a mold for molding a supporting insulator.

In such a mold, it is common to use a holder 9 to hold the support fitting 8 in the cavity 5 of the mold 1, so an air reservoir function is provided between the holder 9 and the mold 1. What is necessary is to provide a gap 7 that plays a role.

Moreover, FIG. 4 shows an embodiment suitable for a mold having a core 10 in the upper part of the cavity 5 of the mold 1, such as when molding an outdoor pin insulator. A gap 7 that functions as an air reservoir may be provided between the core 10 and the mold 1 on the assembly surface.

As is clear from the above description, according to the present invention, the mold has a cavity inside and can be divided along the mating surface of the mold, and an air reservoir that can communicate with the cavity is provided inside the mold. The resin can be injected into the cavity under pressure while the air in the cavity that could not be exhausted from the mating surface of the mold is trapped in the air reservoir, eliminating the need for a degassing port, which reduces the time required for the resin in the cavity to gel. Meanwhile, the molding process can be simplified and efficiency can be improved by eliminating the need for any device to block the deaeration port.

[Brief explanation of drawings]

FIG. 1 is a front view showing the mating surfaces of a mold according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along a plane perpendicular to the mating surfaces of the mold, and FIG. 3 and FIG. 4 is a front view showing the mating surfaces of a molding die according to another embodiment of the present invention. 1... Mold, 2... Matching surface, 3, 4...
...Mold member, 5...Cavity, 6...
...Inlet, 7...Air reservoir.

Claims (1)

[Scope of utility model registration request] In a mold that has a cavity inside and is splittable along a mold mating surface, and in which air in the cavity is discharged from the mating surface, the inside of the mold has air communicating with the cavity. A mold for pressurized gelling molding that does not require a degassing port, characterized in that a reservoir is provided so that air in the cavity that cannot be exhausted from the mold mating surface is collected into the air reservoir.