JPH07223235A - Continuous molding device for thermosetting resin product - Google Patents

Abstract

PURPOSE:To provide a continuous molding device for a thermosetting resin product which can shorten the molding cycle to the same extent as that of a thermoplastic resin product. CONSTITUTION:Thermosetting resin injection devices 15 and mold clamping devices 16 are provided in respective stations by means of a rotary device 30 with a rotating table 31 on which a plurality of mold devices to be opened and closed freely by an opening and closing means are mounted. A mold clamping and injecting station S1 for mold clamping and injecting thermosetting resin into a molded produce cavity, a setting station S2 for carrying out the setting of a thermosetting resin, a release station S3 for opening a molding tool and releasing a molded product and an insert setting station S4 for setting an insert into the molded product cavity are moved successively in the above- said order.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous molding apparatus for thermosetting resin products. The thermosetting resin in the present invention also includes rubber.

[0002]

2. Description of the Related Art For example, when a thermosetting resin such as a phenol resin, an epoxy resin, or a rubber is molded, it is necessary to heat the resin after it is injected into a mold and then heated.

However, since this method requires a curing time in addition to the injection time, the molding cycle is longer than that of the thermoplastic resin, and there is a problem in productivity in continuous molding. Further, the molded product may be put in a furnace or the like to be heated and cured, but this method may cause uneven curing.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such a problem, and is a thermosetting resin which can shorten the molding cycle to the same degree as that of a thermoplastic resin product. It is intended to provide a continuous molding device for resin products.

[0005]

That is, the present invention is
A mold device in which a mold having a molded product cavity formed of an upper mold and a lower mold can be opened and closed by an opening and closing means,
A rotary device having a rotary table on which a plurality of the mold devices are placed and sequentially moving the mold devices to the following stations by rotating the rotary table, wherein each station is a thermosetting resin injection device. And a mold clamping / injection station equipped with a mold clamping device for performing mold clamping and injecting a thermosetting resin into the cavity of the molded product,
A curing station that advances the curing of the thermosetting resin in the molded product cavity, a demolding station that opens the molding die to demold the molded product, and an insert set station that sets an insert in the molded product cavity. The present invention relates to a continuous molding apparatus for thermosetting resin products, characterized in that the thermosetting resin products are arranged in the above order in the rotational direction of the rotary table.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a plan view showing an example of a continuous molding apparatus of the present invention, FIG. 2 is a perspective view showing an example of a molding die, FIG. 3 is a partially cutaway sectional view showing an essential part thereof, and FIG. FIG.

As shown in FIG. 1, the continuous molding apparatus of the present invention comprises a mold device 10 and a rotary device 30 for sequentially moving the mold device 10 to a plurality of stations S1, S2 ,. It is suitable for molding thermosetting resin products that require a long curing time in addition to time and the like.

In this example, an injection molding device 40 for molding an insert placed in the mold device 10 in parallel with molding of a product, a robot device 50 for setting the insert in the mold device 10, and Conveying devices 60 for conveying the obtained thermosetting resin products are arranged in parallel.

As shown in FIG. 2, the mold device 10 includes an upper mold 11 and a lower mold 12 inside which a molded product cavity 13 is formed.
The molding die for forming is opened and closed by the opening and closing means 20. The upper mold 11 and the lower mold 12 are provided with a known heating means for heating the resin injected into the molded product cavity to the curing temperature. As the heating means, a heating medium passage is provided in the upper die 11 or the lower die 12, and a heating medium such as heating oil or hot water is supplied to the heating medium passage, or an electric heater is provided in the die. And so on. In this case, it is preferable to connect the piping, wiring, or the like through the center of the rotary table 31, which will be described later, to the heat medium supply device or the like, because it does not become entangled when the rotary table 31 rotates. In the case of an electric heater,
A combination of slip ring and brush is used. Of course, the heating means may not be provided in the molding die, and warm air or hot air may be blown to the outer surface of the molding die. Reference numeral 14 in the figure
Is a sprue hole.

As can be seen from FIG. 3, the opening / closing means 20.
Are ball nuts 21a, 2 provided on the upper mold 11.
1b and ball screws 22a, 22 rotatably erected on the lower die 12 and engaged with the ball nuts 21a, 21b.
b and a drive motor 23 for rotating the ball screws 22a and 22b.

The ball nuts 21a and 21b move up and down of the upper die 11 by the rotation of the ball screws 22a and 22b.
That is, it is for opening and closing the mold, and is provided at the edge of the upper mold 11 in the vertical direction.

The ball screws 22a and 22b are the upper mold 1
The lower die 12 is rotatably erected on the lower die 12 so as to mesh with the first ball nuts 21a and 21b, and the lower end portion thereof is connected to the drive motor 23 by the drive force transmission means 24.

Incidentally, the driving force transmission means 24 of this embodiment
Is the rotary shaft of the drive motor 23 and one ball screw 22a.
Gears 25, 2 provided at the lower ends of the gears so as to mesh with each other
6, gears 27a and 27b provided at the lower ends of both ball screws 22a and 22b, and a belt member 27c that is hung between the gears 27a and 27b.

A well-known servomotor is suitable for the drive motor 23, and the rotational force thereof is the gears 25, 26 and the belt member 2.
It is transmitted to the ball screws 22a and 22b via 5c. The drive motor 23 is connected to a known power source and control device (not shown) so as to rotate normally or reversely. The wiring of the drive motor 23 is preferably performed through the rotation center portion of the rotary table 31 described below so that the wiring does not get entangled by the rotation of the rotary table 31. In that case, wiring is performed via a slip ring and a brush at the center of rotation.

On the other hand, as shown in FIG. 4, the rotary device 30 includes a rotary table 31 on which a plurality of the mold devices 10 are mounted and a drive section 32 for rotating the rotary table 31.
Consists of. The rotary table 31 is formed in a substantially circular shape as shown in the figure, and the plurality of mold devices 10 described above are provided with a central rotary shaft 33.
It is fixed radially around. The mold device 10 is
By the rotation of the rotary table 31, the stations S1, S2, ... Required for molding the thermosetting resin product are sequentially moved.

The station comprises a mold clamping / injection station S1, a curing station S2, a demolding station S3, and an insert set station S4, which are arranged in this order in the rotational direction of the rotary table 31. The stations may be increased or decreased depending on the type of resin product to be molded. For example, the insert set station may be omitted if inserts are not needed. Further, in the present embodiment, an insert is placed in the molded product cavity 13 of the mold device 10 in advance, and a continuous molding device for manufacturing a thermosetting resin product integrally with the insert is shown. It will be described from S4.

The insert setting station S4 is for setting an insert for a resin product in the mold cavity 13. In this example,
An injection molding machine 40 for the insert is provided in order to perform molding of the insert in parallel with molding of the molded product, but the insert may be a preformed metal product or resin product.

The injection molding device 40 for the insert is
It is composed of a molding die 41 and an injection device 45. A known mold including a fixed mold 42 and a movable mold 43 is used as the molding die 41, and an appropriate resin material is injected into the cavity of the molding die 41 by the injection device 45 to mold an insert having a predetermined shape. It After the molding of the insert is completed, the mold 41 is opened, and the insert is demolded by the robot device 50 and set in the molded product cavity 13 of the mold device 10. At this time, the mold device 10 is configured such that the opening / closing means 2
The mold is opened by 0 and positioned at the insert set station S4.

The robot device 50 will be described below. As shown in FIG. 1, the robot device 50 includes an arm 51 formed by a joint part 52 to be bendable,
It comprises a grip portion 53 at the tip of the arm 51. The robot device 50 is rotated between the injection molding device 40 for insert molding and the insert set station S4 by an appropriate driving device. Then, the grip portion 53 takes out the insert from the injection molding device 40, and sets the insert in the molding die cavity 13 of the molding device 10 which has moved to the insert setting station S4. In addition, regardless of the robot device,
Of course, you may set the insert manually.

Thereafter, the mold apparatus 10 is rotated by the rotary table 31 while the mold is closed by the opening / closing means 20.
Move to mold clamping / injection station S1. This mold clamping / injection station S1 includes a thermosetting resin injection device 15
And a mold clamping device 16, and a thermosetting resin is injected into the molded product cavity 13 in which the insert is arranged. A known injection molding machine is preferably used for the thermosetting resin injection device 15, and the mold clamping / injection station S1 is used.
Moved to the inside of the molded product cavity 13 of the mold device 10,
Thermosetting resin is injected through the sprue hole 14.

The mold clamping device 16 includes the rotary table 31.
And the thermosetting resin injection device 15.
The mold clamping device 16 has a movable platen 17 that moves forward and backward in the vertical direction with respect to the mold device 10 on the mold clamping / injection station S1, and when the thermosetting resin is injected, the upper mold 1
1 is pressed against the lower mold 12 to clamp the mold. The mold clamping device 16 is preferably a C-shaped device whose side surface is substantially C-shaped as shown in FIG. 4 so as not to collide with the rotary table 31 and the mold device 10. Reference numeral 18 is a cylinder ram for vertically moving the movable plate 17. During the mold clamping, the opening / closing device 20 is temporarily set in the free state, and is operated again when the mold clamping is released after the injection to continue the mold closing.

At the mold clamping / injection station S1, the mold device 10 in which the thermosetting resin has been injected into the molded product cavity 13 is further rotated by the rotary device 30 to reach the curing station S2. In the curing station S2, the thermosetting resin injected into the molded product cavity 13 is transferred to the next demolding station S by the mold device 10.
The mold device 10 is heated according to the curing temperature of the thermosetting resin so as to be cured into the shape of the molded product cavity 13 by the time of reaching 3.

Next, at the demolding station S3 to which the molding apparatus 10 is fed, the molded product cured at the curing station S2 is demolded. In the demolding station S3, the opening / closing means 20 of the mold apparatus 10 is operated to open the mold, and the robot member 50 causes the cavity 13 to be opened.
The molded product inside is taken out. The molded product thus taken out is placed on a conveyor device 60 such as a conveyor and conveyed to a predetermined post-process.

After the demolding, before moving to the next station, the molding apparatus 10 is cleaned if necessary,
If desired, a mold release agent is applied to the cavity surface, and then the cavity moves to the insert set station S4.

[0025]

As shown and described above, according to the continuous molding apparatus of the present invention, the thermosetting resin is injected, cured, and released from the mold while the mold apparatus moves through each station by the rotary device. If necessary, the insert set for the next molding is successively carried out successively, so that the molding cycle of such a thermosetting resin product can be shortened to the same level as that of the thermoplastic resin product.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a continuous molding apparatus of the present invention.

FIG. 2 is a perspective view showing an example of a molding die.

FIG. 3 is a partially cutaway sectional view showing a main part thereof.

FIG. 4 is a view from arrow 4 in FIG.

[Explanation of symbols]

 10 Mold device 11 Upper mold 12 Lower mold 13 Molded product cavity 15 Thermosetting resin injection device 16 Mold clamping device 20 Opening / closing means 21a, 21b Ball nuts 22a, 22b Ball screw 23 Drive motor 24 Driving force transmission means 30 Rotary device 31 Rotary table S1 Mold clamping / injection station S2 Curing station S3 Demolding station S4 Insert set station

Claims (4)

[Claims] 1. A mold apparatus comprising a mold including an upper mold and a lower mold, the mold having a mold cavity inside thereof, which can be opened and closed by an opening / closing means, and a rotary table on which a plurality of the mold apparatuses are mounted. A rotary device for sequentially moving the mold device to a plurality of stations shown below by rotation of a rotary table, wherein the station includes a thermosetting resin injection device and a mold clamping device, A mold clamping / injection station for injecting a thermosetting resin into the mold, a curing station for advancing the curing of the thermosetting resin in the molded product cavity, and a demolding process for opening the molding mold and demolding the molded product. A continuous molding device for thermosetting resin products, characterized in that the thermosetting resin products are arranged in the above-mentioned order in the rotation direction of the rotary table, including stations. 2. A continuous molding of a thermosetting resin product according to claim 1, further comprising an insert set station for setting an insert in a molded product cavity between the demolding station and the mold clamping / injection station. apparatus. 3. The ball nut according to claim 1, wherein the mold opening / closing means is provided on the upper mold in a vertical direction, and a ball screw rotatably erected on the lower mold so as to mesh with the ball nut. A thermosetting resin continuous molding apparatus comprising a drive motor connected to the ball screw via a drive force transmission mechanism. 4. The method according to any one of claims 1 to 3,
A continuous molding device for thermosetting resin products, characterized in that the mold clamping device has a substantially C-shaped side surface.