JP2672898B2 - Molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a molding apparatus for manufacturing an insulator from a resin which is a molding material.

[0002]

2. Description of the Prior Art As shown in FIG. 2, a conventional molding apparatus shown in Japanese Utility Model Application No. 1-91272 discloses a material tank 2 for agitating a resin 1 which is a molding material housed therein, and a molding section 1.
The mold 1 for curing the resin 1 filled in the mold 4 to mold a molded product, the resin from the material tank 2 to the forming part 1 of the mold 13.
An injection hose leading to No. 4 is connected.

In the material tank 2, a driving motor 4 is installed on a lid 3 that closes the upper opening, and the driving motor 4 is
A shaft 4a vertically penetrating the lid 3 is fitted with a stirring blade 5 for uniformly mixing a main component, a filler, a curing agent, etc., which are the main components of the resin 1. A pipe 6 for supplying air is connected to the lid 3, and the material tank 2 is connected to the pipe 6.
A pressure adjusting valve 7 for applying pressure to the resin 1 therein and for adjusting the pressure is attached, and a pressure gauge 8 is attached. Further, a discharge valve 9 for discharging the resin 1 is attached to the bottom of the material tank 2, and a packing / 0 which functions as a stopper is attached, and a cylinder 11 is provided below the packing / 0. The piston 12 which can be moved up and down is located. The resin 1 is discharged from the discharge valve 9 as the piston 12 is processed, and the discharge valve 9 is closed as the piston 12 rises.

Further, the mold 13 is provided with a molding portion 14 for curing the resin 1 filled therein to mold an insulating material, and a runner 15 serving as a filling path of the resin 1 to the molding portion 14 is provided in the lower portion. An injection nozzle 17 that moves up and down by a cylinder 16 is in contact with the runner 15 from below. The injection nozzle 17 contacts the runner 15 to fill the molding portion 14 with the resin 1, and the injection nozzle 17 separates from the runner 15 to prevent the resin 1 from filling the molding portion 14.

Further, the injection hose 18 has one end connected to the discharge valve 9 and the other end connected to the injection nozzle 17.

Therefore, in order to manufacture a molded product from the resin 1,
First, the discharge valve 9 is closed, the resin 1 is charged into the material tank 2, the driving motor 4 is driven, the blade 5 is rotated once, and the materials of the resin 1 are stirred until they are uniformly mixed. After confirming that the resin 1 is uniformly mixed, the discharge valve 9 is opened to inject the resin 1 from the material tank 2 into the hose 18
-The air is supplied into the material tank 2 by controlling the pressure adjusting valve 7 that guides the material to the molding unit 14 of the mold 13 through the injection nozzle 17 and the runner 15 and then pressurizes the material tank 2. When air is supplied, the resin 1 becomes the material tank 2
From the molding part 1 to the molding part 14 is gradually filled.
4 until resin 1 is full. And after filling,
In this state, the resin shrinkage generated when the resin 1 is cured is replenished, and the resin 1 is cured by pressurizing for a certain period of time.

Next, when the molded product is completed, the discharge valve 9 of the material tank 2 is closed and the cylinder 1
6 is operated to separate the injection nozzle 17 from the runner 15 so that the resin 1 is not supplied from the material tank 2 to the molding unit 14, and then the completed molded product may be taken out from the molding portion 14 of the mold 13. With the above work, a series of molding steps is completed.

[0008]

The conventional molding apparatus is constructed as described above, and must be kept under pressure for a certain period of time while the resin is being replenished until the resin 1 of the molding portion 14 of the mold 13 is cured. Therefore, there was a problem that the material preparation for the next molding had to be performed from the time when the mold 13 and the injection nozzle 17 were separated, that is, from the time when the molding was completed.

The present invention has been made in view of the above, and the edges of the material tank and the mold are cut during the curing process of the resin 1 in the molding part, and then the following materials are mixed in the material tank. The purpose is to obtain a molding apparatus that can be prepared for the next molding.

[0010]

In the present invention, in order to achieve the above object, a material tank for agitating a resin contained therein and a mold for curing a resin filled in a molding portion to mold a molded article. Is connected to an injection hose that transfers the resin from the material tank to the molding part of the mold, and at the same time, the resin for curing shrinkage is replenished in the molding part between the material tank and the injection hose and It is characterized in that it is disposed with a resin supply valve for holding the resin under pressure.

[0011]

According to the present invention, the resin supply valve replaces the material tank and supplies the resin for curing shrinkage into the molding portion and holds it under pressure, so that the material tank can be used early and the daily production amount can be increased. Can be increased.

[0012]

EXAMPLES The present invention will be described in detail below with reference to the example shown in FIG. 1. The molding apparatus according to the present invention comprises an injection hose 18 connected to a discharge valve 9 and an injection hose 18 connected to an injection nozzle 17. A resin replenishment valve 19 is connected to the above. This resin replenishment valve 19 is provided in the main body and is mounted on the resin reservoir 190 for storing the resin 1 that has flowed in from the material tank 2 via the injection hose 18 and the end of the main body to project the piston 191 and connect it to the injection nozzle 17. The injection hose 18 is provided with a cylinder 192 for sending the resin 1 in the resin reservoir 190 by pressure, and the resin 1 is supplied to the molding portion 14 of the mold 13 and the air that pressurizes the resin 1 in the material tank 2 is supplied. It has a function of holding the resin 1 under pressure with an equivalent pressure.

The shaded portion in the resin reservoir 190 indicates the resin replenishment allowance when the resin 1 cures and shrinks. The other parts are the same as those of the conventional example except for the pipe 6, the pressure adjusting valve 7, and the pressure gauge 8.

Therefore, in order to manufacture a molded product from the resin 1, first, the discharge valve 9 is closed, the resin 1 is put into the material tank 2, and the drive motor 4 is driven to rotate the blade 5 once. , And stir until each material of resin 1 is mixed uniformly. After confirming that the resin 1 is uniformly mixed, the discharge valve 9 is opened to inject a predetermined amount of the resin 1 from the material tank 2 into the hose 18, the resin supply valve 19, and the injection hose 18.
It is guided to the molding part 14 of the mold 13 through the injection nozzle 17 and the runner 15, and after the completion of the conveyance, the cylinder 11 is operated to raise the piston 12 and close the discharge valve 9 to close the resin 1. Stop the spill. After this stop, the piston 191 located at the retracted position of the resin supply valve 19 is projected so that the resin 1 corresponding to the curing shrinkage of the resin reservoir 190 is molded.
4 is sufficiently replenished and pressure is applied until the resin 1 in the molding portion 14 is cured.

Further, in parallel with the operation of the resin replenishment valve 19, new resin 1 is charged into the empty material tank 2 which does not require resin replenishment, and the preparation of the material for the next lot is started. By performing such work, it is possible to improve the usage turnover rate of the material tank 2 and increase the daily production amount. It should be noted that a comparison of the time for preparing the next material in the resin supply valve 19 and the material tank 2 requires approximately the same time (about 1 hour).

Next, when the molded product is completed, the cylinder 192 of the resin supply valve 19 is operated to move the protruding piston 191 backward to the position shown in FIG. With this backward movement, the level of the resin 1 remaining in the injection hose 18 decreases, and even if the injection nozzle 17 is isolated from the runner 15, the resin 1 can be prevented from overflowing from the tip of the injection nozzle 17. However, after that, the mold 13 may be released to take out the product as a molded product. 1 by the above work
The cycle molding operation is completed.

[0017]

According to the present invention as described above, according to the present invention, molding portion
The resin in the molding section is replenished with the resin for curing shrinkage.
A resin replenishment valve that pressurizes and holds oil is injected into the material tank.
Since it is arranged between the hose and the hose, there is an effect that the material tank can be emptied at an early stage to improve the usage rotation rate of the material tank and increase the production amount per day. Also,
A resin reservoir for replenishing the mold is provided outside the mold.
Therefore, the mold can be made compact and
In addition, a sufficient amount of resin supply can be secured. Further
In addition, the resin is always
Since the pressure is maintained at the same pressure, there is a slight
It is possible to prevent resin shortage and sink marks,
The quality can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a molding apparatus according to the present invention.

FIG. 2 is a sectional explanatory view showing a conventional molding device.

[Explanation of symbols]

 1 Resin 2 Material Tank 9 Discharge Valve 13 Mold 14 Molding Part 17 Injection Nozzle 18 Injection Hose 19 Resin Supply Valve 190 Resin Reservoir 191 Piston 192 Cylinder

Claims (1)

(57) [Claims] A material tank for stirring the 1. A resin which is housed inside a mold for molding the cured molding resin filled in the forming mold unit is connected via an injection hose, the upper
The resin in the material tank passes through the injection hose and
In the molding device delivered to the mold,
Above between the injection hose is adapted to replenish the cure shrinkage of the resin in the molding portion, molding apparatus and a resin supply valve for pressure holding the resin in the molding portion is provided.