JPH11226982A - Molding tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding tool whereby a plurality of intended moldings can be molded simultaneously with excellent qualities and, moreover, can be realized at a cost as low as possible. SOLUTION: A plurality of moving members 44 (44a, 44b) which are made to advance into and withdraw from a plurality of molding cavities so as to increase and decrease the capacities of the molding cavities are provided in one of a movable half 12 and a stationary mold 14 at least, while pressure transfer means 38 (38a, 38b), 40, 42 and 46 (46a, 46b) which make the moving members 44 in a plurality advance into and withdraw from the molding cavities in a plurality in accordance with difference between pressures applied to these moving members 44 respectively are provided so as to increase and decrease the capacities of the molding cavities according to the pressure difference. Thereby a pressing force applied to molding materials 48 (48a, 48b) held in the molding cavities respectively can be made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die, and more particularly to an improved structure of a molding die capable of simultaneously molding a plurality of target molded products.

[0002]

2. Description of the Related Art Conventionally, in molding various kinds of molds, a case where a plurality of molded products having the same shape are obtained, that is, a so-called multi-cavity is formed, and a case where a plurality of molded products having different shapes are formed, a so-called set-mold is performed. Has a fixed mold and a movable mold, and between the two molds, a plurality of molding cavities having a shape corresponding to the outer shape of the target molded product are formed independently of each other, and one molding cycle Many molding dies have been used so that a plurality of desired molded products can be molded at the same time, thereby improving productivity.

However, a molding material accommodated in a molding cavity is molded under pressure to obtain a desired molded product. For example, compression molding and injection compression molding are performed using a molding die having the above-described structure. In such a case, the amount (volume) of the molding material accommodated in each of the plurality of molding cavities may vary, or the degree of parallelism between the fixed mold and the movable mold may vary. The pressure applied to the molding material in each molding cavity becomes uneven, thereby deteriorating the surface quality of the molded product obtained from the molding material with insufficient pressure, and in some cases, reducing the thickness of the molded product. Sometimes happened.

On the other hand, Japanese Patent Application Laid-Open No. Hei 5-84760 discloses that
Attach a plurality of sets of upper mold (movable mold) and lower mold (fixed mold) to one press device (mold clamping device), and simultaneously mold multiple molded products by one press molding operation. A compression molding machine adapted to obtain is disclosed. In addition, the publication also describes that the compression molding machine disclosed therein has a structure capable of solving the problem of product defects as described above, which is caused when simultaneously molding a plurality of molded products. Have been.

That is, in the compression molding machine disclosed in the above publication, a plurality of cylinders accommodating a piston member are provided inside a movable plate of a press device, and a plurality of upper dies are provided. Each of the pressure oil supply devices is mounted so as to be able to move up and down in a state where each of the cylinders protrudes into each cylinder portion at an upper portion thereof, and further supplies pressure oil having the same pressure into each of the cylinders. Is provided, whereby the piston members in each cylinder member are pressed by the same pressure oil supplied from the pressure oil supply device. An even pressure can be applied. And, as a result, even if the upper mold and the lower mold have a twist in the parallelism, the pressing force on the molding material in each molding cavity can be made uniform, and the resulting molded product can be obtained. Thus, problems such as deterioration of surface quality and underfilling can be advantageously solved.

However, in a compression molding machine having such a structure, pressure oil having the same pressure is supplied from a pressure oil supply device into a plurality of cylinders.
Since the pressure applied from each upper mold to the molding material in each molding cavity can be made uniform, the same pressure is applied in order to equalize the pressure applied to the molding material in each molding cavity. An expensive pressure oil supply device configured to be able to supply pressure oil must be provided. Therefore, a great economic burden is imposed on improving the quality of a plurality of molded articles to be molded. There was a drawback.

In addition, in such a compression molding machine, a plurality of cylinders to which pressurized oil is supplied from a pressurized oil supply device are provided on a movable plate of a press device, and a plurality of upper dies are provided. Each of the upper portions thereof is mounted so as to be able to move up and down in a state of being protruded into each cylinder portion, so that a general press device cannot be applied, and a movable plate having a special structure is provided. In addition, a dedicated press device is required, which has also caused a great economic burden for improving the quality of the molded product.

[0008]

Here, the present invention has been made in view of the above-mentioned circumstances, and a problem to be solved is that a plurality of target molded articles always have a uniform pressing force. The present invention provides a structure of a molding die that can be simultaneously press-molded to improve the quality of the plurality of molded products, and that can be realized with as low an economical burden as possible. It is in.

[0009]

According to the present invention, in order to solve the above-mentioned problem, a fixed die and a movable die forming a plurality of molding cavities independent from each other between the fixed die are provided.
The molding material accommodated in the plurality of molding cavities is each subjected to pressure molding, so that at least one of the fixed mold and the movable mold is used in a molding die configured to simultaneously mold a plurality of target molded products. On the other hand, each of the plurality of molding cavities is disposed so as to be able to advance and retreat,
Along with providing a plurality of moving members for increasing or decreasing the volume of each of the plurality of molding cavities according to such advance and retreat,
The plurality of moving members are connected so that the pressure applied to each of them can be transmitted to each other, so that the plurality of moving members advance and retreat with respect to the plurality of molding cavities according to the difference in the pressure. By providing a pressure transmitting means, and increasing or decreasing the volume of the plurality of molding cavities in accordance with the difference in pressure applied to each of the plurality of moving members, to the molding material respectively housed in the plurality of molding cavities Is characterized in that it is configured to make the pressing force uniform.

[0010] In short, in the molding die according to the present invention, the plurality of moving members provided on at least one of the movable die and the fixed die use the pressure transmitting means in accordance with the difference in pressure applied to each of them. As a result, the volume of each molding cavity is increased or decreased as it is advanced or retracted with respect to each molding cavity. As a result, the pressure applied to the molding material accommodated in each molding cavity is reduced. It can be made uniform.

Therefore, in such a molding die, the capacity (volume) of the molding material accommodated in each molding cavity.
Even when the variation of the fixed mold and the movable mold has occurred, the pressing force applied to the molding material in each molding cavity can always be effectively uniformized. A plurality of target molded products can be simultaneously pressure-formed with excellent quality having no defects such as deterioration of surface quality and underfill.

In the molding die according to the present invention, as described above, in order to make the pressing force applied to the molding material in each molding cavity uniform, the movable die or the fixed die is simply used. It is merely provided with a plurality of moving members configured as a part and pressure transmitting means for moving the plurality of moving members forward and backward with respect to the molding cavity. Unlike conventional compression molding machines that require a pressure oil supply device that can supply pressure oil at the same pressure,
No expensive pressure oil supply device or the like is provided, whereby a structure for simultaneously molding a plurality of target molded products with excellent quality can be advantageously provided at relatively low cost. It is.

In addition, in such a molding die, a structure for equalizing the pressure applied to the molding material in each molding cavity is provided in the die itself. Unlike the conventional compression molding machine that is provided in the press device (mold clamping device) for opening and closing the mold,
A general pressing device having a known structure can be advantageously applied, so that a structure that enables a plurality of molded products to be simultaneously pressed with excellent quality causes an increase in cost. And it can be advantageously implemented.

Therefore, in the molding die according to the present invention, a plurality of target molded products are always simultaneously and satisfactorily pressurized with excellent quality having no defect such as deterioration of surface quality or underfill. It can be shaped, and it can be realized with the lowest possible economic burden. As a result, it is possible to extremely efficiently and economically perform multi-piece or set molding of molded products having higher quality.

In the molding die according to the present invention, preferably, the pressure transmitting means includes a plurality of piston members connected to each of the plurality of moving members, and the plurality of pistons. A plurality of cylinder members each accommodating a member, and each piston member is reciprocated by increasing / decreasing the amount of accommodation accommodated in the plurality of cylinder members, so that each of the moving members advances / retreats with respect to each of the molding cavities. A working fluid to be squeezed, and a connecting member that connects the plurality of cylinder members to each other in a communicating state and allows the working fluid to flow freely between the plurality of cylinder members; Actuating the piston member connected to the one moving member in response to the pressure applied to one, the working fluid to the connecting member between the plurality of cylinder members The piston member connected to the other of the plurality of moving members can be actuated, and the pressure applied to each of the plurality of moving members is transmitted to each other. In addition, the plurality of moving members can be advanced and retracted with respect to the plurality of molding cavities in accordance with a difference in pressure applied to each of the moving members. According to such a configuration, the pressure transmitting means can be realized with a relatively simple structure.

In the molding die according to the present invention,
Since the plurality of moving members can be advanced and retracted respectively with respect to the plurality of molding cavities, each molding of each moving member is formed at a contact portion of each of the plurality of molded articles to be molded with the respective moving member. Protrusions and depressions corresponding to the advance and retreat with respect to the cavity are formed. Therefore, in order to prevent such convex portions and concave portions formed in each molded product from being easily visually recognized from the outside, each moving member is required to be a movable type or a fixed type. It is desirable to be provided at a site that provides a design surface.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to clarify the present invention more specifically, the configuration of a molding die according to the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows, as an example of a molding die having a structure according to the present invention, a compression molding die configured to be able to simultaneously press-mold a plurality of molded products having the same shape. It is schematically shown in a state where it is mounted on the device. As is clear from FIG. 1, the compression molding die 10 of this example is configured to have a movable die 12 and a fixed die 14 which are arranged coaxially opposite each other in the vertical direction. .

More specifically, the movable die 12 constituting the compression molding die 10 has a substantially rectangular block shape as a whole, and a rectangular shape having the same size is provided at the center of the lower surface. Mold cavity forming recesses 1 having
6a and 16b are provided side by side.

On the other hand, the fixed mold 14 also has a substantially rectangular block shape as a whole. Then, on the upper surface thereof, the two cavity forming recesses 1 of the movable mold 12 are formed.
Two molded cavity forming projections 18a, 18b are integrally provided at respective portions opposed to 6a, 16b. In addition, this molding cavity forming protrusion 1
8a and 18b are respectively provided in two mold cavity forming recesses 16a and 16b provided in the movable die 12.
It has the same rectangular shape that can be inserted with very little clearance.

The movable mold 12 and the fixed mold 1
The compression molding die 10 made of No. 4 is assembled to a press having a known structure, similarly to the conventional one. That is, the fixed mold 14 is moved through the fixed mold mounting plate 20,
The movable mold 12 is fixed to a position fixed to the base 22 in a state where it cannot be moved. The movable mold 12 is moved up and down together with a piston rod 24 by a hydraulic mechanism (not shown). Through the mounting plate 28,
It is fixed in position.

Thus, in the compression molding die 10, the movable die 12 is moved closer to and away from the fixed die as the movable platen 26 moves downward and upward.
Thereby, mold closing and mold opening can be performed. Then, in the closed state of the mold, the two molding cavity forming recesses 16a and 16 of the movable mold 12 are formed.
b, two mold cavity forming projections 1 of the fixed mold 14
8a and 18b are inserted into the movable mold 12 and the fixed mold 14 at a predetermined depth with a very small clearance, respectively. Each of these two molding cavities 29a, 29 has a low rectangular shape and can be formed with the same shape.
Within b, two target molded products having shapes corresponding to them can be formed at once by pressure (see FIG. 3).

Thus, in the compression mold 10 according to this embodiment, in particular, the central portion of each of the two molding cavity forming projections 18a, 18b provided on the fixed mold 14. In addition, through holes 30a and 30b that penetrate the fixed mold 14 in the axial direction are provided one by one.
In each of the two through holes 30a, 30b, the upper side is the small diameter portions 32a, 32b, and the lower side is the large diameter portions 34a, 3b.
4b. The lower surface of the fixed die 14 in which the large diameter portions 34 of the two through holes 30a and 30b are opened is provided with the two through holes 30a and 3b.
A groove 36 extending across each large-diameter portion 34 of Ob is formed with a predetermined depth.

The two through holes 30a, 30
b, two cylinders 38 in the large diameter portions 34a and 34b.
a and 38b are accommodated and arranged one by one,
A connecting pipe 40 connecting the two cylinders 38a and 38b is provided in the groove 36 extending across the large diameter portions 34 in a state where the spaces in the two cylinders 38a and 38b communicate with each other. Is accommodated and arranged. Further, inside the two cylinders 38a and 38b, an oil 42 as a working fluid is accommodated through a connecting pipe 40 so as to be freely flowable in both of the two cylinders 38a and 38b.

On the other hand, in the small diameter portions 32a and 32b of the two through holes 30a and 30b, two moving blocks 44a and 44b as moving members are respectively housed and arranged. These two moving blocks 44a, 44
b has an outer diameter slightly smaller than the inner diameter of the small-diameter portion 32 of each through-hole 30 and has substantially the same length. Thereby, the two moving blocks 44a and 44b can be slid in the vertical direction along the axial direction of each through hole 30, and at the upper end surface, the two molding blocks are formed. The lower surfaces of the cavity surfaces of the molding cavities 29a and 29b can be given together with the upper surfaces of the cavity forming projections 18a and 18b (see FIG. 3).

Further, such moving blocks 44a, 4a
4b, the piston portions 46a, 46
b are integrally formed so as to protrude. Then, the two piston portions 46a, 46b extend into the large diameter portions 34a, 34b of the two through holes 30a, 30b, and furthermore, the two cylinders 38a, Each of the cylinders 38b is positioned so as to protrude, and can be moved up and down as the amount of oil 42 stored in each cylinder 38 increases or decreases. The compression molding die 1 of this specific example
0, as shown in FIG. 1, the amount of oil 42 stored in the two cylinders 38a and 38b is configured to be the same under the mold open state, whereby each molding cavity is formed. The upper surface of the forming projection 18 and the upper end surface of each moving block 44 are flush with each other when the mold is opened.

Thus, the compression molding die 1 according to this embodiment is
0, for example, two moving blocks 44a, 4
When a pressure greater than that of the other moving block 44b is applied to one of the moving blocks 44a in the downward direction, the one moving block 44a and the piston portion 46a formed integrally therewith are both formed. The cylinder 38 which has been pushed down,
The oil 42 in a flows through the connecting pipe 40 into the cylinder 38b of the other moving block 44b, into which the piston portion 46b is located, by the amount of the liquid level lowered by the piston portion 46a. Accordingly, the capacity of the oil 42 in the cylinder 38b is increased, and the piston 46b is pushed up by an amount corresponding to the rise of the liquid level of the oil 42, so that the moving block 44b moves upward. I am being squeezed. When a pressure greater than that of the one moving block 44a is applied downward to the other moving block 44b, the other moving block 44b is lowered by a predetermined amount, contrary to the above. The other moving block 44a is raised by an amount corresponding to the amount of lowering of the other moving block 44b.

That is, in the compression molding die 10, the two moving blocks 4a and 44b are moved in accordance with the difference in pressure applied to the two moving blocks 44a and 44b.
4a and 44b can be moved up and down, and with such up and down movement, FIG.
In the closed state of the mold as shown in FIG.
4a and 44b are provided for two molding cavities 29a and 29b formed between the movable mold 12 and the fixed mold 14,
Each of them can be advanced and retreated.

Thus, in the compression molding die 10 of the present embodiment, the two moving blocks 44a, 44
4b is applied to two cylinders 38
The two pistons 46a, 46b protruding into the a, 38b and the two cylinders 38a, 38b are accommodated in the two cylinders 38a, 38b and are allowed to flow freely through the connecting pipe 40 to the two cylinders 38a, 38b. The two moving blocks 4 can be transmitted to each other via the oil 42 to be transferred.
The two molding cavities 29 of the two moving blocks 44a, 44b according to the pressure difference applied to the 4a, 44b.
The volume of each of the molding cavities 29 can be increased or decreased in accordance with the advance and retreat with respect to a and 29b. As is apparent from this, in this specific example, the pressure transmitting means is constituted by the two piston portions 46a and 46b, the two cylinders 38a and 38b, the connection pipe 40, and the oil 42.

By the way, when a plurality of target molded products are obtained by using the compression molding die 10 of the present embodiment having such a configuration, it is advantageous to perform the molding according to the following steps. The operation will proceed.

That is, first, as shown in FIG. 2, two molding materials 48a and 48b made of a soft sheet-like glass fiber reinforced resin material to give a desired molded product.
To the two mold cavity forming projections 18 of the fixed mold 14.
a, 18b. Here, of the two molding materials 48a and 48b, the molding material 48a placed on one molding cavity forming projection 18a is placed on the other molding cavity forming projection 18b. The amount (volume) of the molding material 48b is slightly larger than that of the molding material 48b.

Next, as shown in FIG. 3, the press device is operated, and the piston rod 2 is moved by a hydraulic mechanism (not shown).
4 and the movable platen 26 are lowered to move the movable mold 12 to the fixed mold 1.
4, the compression molding die 10 is closed. Then, thereby, two molding cavities 29 formed between the movable mold 12 and the fixed mold 14 are formed.
The molding materials 48a and 48b are accommodated in the molding cavities 29a and 29b respectively.
Pressure molding is performed on each of the molding materials 48a and 48b in a and 29.

Here, as described above, the amount of molding material 48a accommodated in one molding cavity 29a is larger than the amount of molding material 48b accommodated in the other molding cavity 29b. Therefore, when these two molding materials 48a and 48b are press-formed,
Higher pressure is applied to the higher volume of molding material 48a, and accordingly the moving block 44a provides a portion of the cavity surface of one of the molding cavities 29a in which the higher volume of molding material 48a is received. However, the other molding cavity 29 in which a small amount of the molding material 48b is accommodated.
A greater pressure will be applied to the moving block 44b, which will provide a portion of b's cavity surface.

On the other hand, as described in detail above, in the compression molding die 10 of this embodiment, two moving blocks 44 are used.
The two moving blocks 44a, 44b are moved up and down in accordance with the difference in pressure applied to the two moving blocks 44a, 44b. , Respectively, with respect to the two molding cavities 29a and 29b, whereby the volume of each of the molding cavities 29 is increased or decreased.

For this reason, in the pressure molding step, as is apparent from FIG.
The moving block 44a, which constitutes a part of the cavity surface of the molding cavity 29a in which a is accommodated, is moved in a direction (downward) to withdraw from the inside of the molding cavity 29a, and the volume of the molding cavity 29a is increased. On the other hand, the moving block 44b, which constitutes a part of the cavity surface of the molding cavity 29b in which the small amount of molding material 48b is stored, is moved in the direction of entering the molding cavity 29b, and the volume of the molding cavity 29b is reduced. Is reduced, and as a result, the pressure applied to the two molding materials 29a and 29b can be made uniform.

Thus, in such a pressure molding step, the two molding materials 48a and 48b having different amounts from each other.
Are molded under pressure with a uniform pressing force, and have the same two shapes of thin rectangular flat plates corresponding to the molding cavities 29a and 29b.
a and 50b are obtained at the same time.

Then, as shown in FIG. 4, the piston rod 24 and the movable platen 26 are raised, and the movable mold 12 is moved away from the fixed mold 14 to open the compression mold 10. Then, the two molded products 50a and 50b obtained as described above are
Let them leave.

As is apparent from FIG.
Each molded product 50 molded according to the molding process as described above
In a and 50b, although a concave portion or a convex portion is formed at a contact portion with the moving blocks 44a and 44b, those concave and convex portions are formed on a non-design surface of each of the molded products 50a and 50b. Therefore, there is no influence on the quality of each of the molded products 50a and 50b.

As described above, the compression molding die 10 of this embodiment is
Is used, even if the amounts of the two molding materials 48a, 48b are different from each other in the molding process of the two target moldings 50a, 50b, the pressure molding process is performed on the two molding materials 48a, 48b. In a state where the pressing force can be made uniform, it can be performed well.

Therefore, in the compression molding apparatus 10, the two target molded products 50a and 50b are simultaneously and extremely excellent in quality with no defects such as deterioration of the surface quality and no underfill. It can be molded well.

Further, in the compression molding die 10 according to this embodiment, the two cylinders 38a and 38b, the connecting pipe 40 for connecting them in a communicating state, and the two cylinders 38a and 38b The oil 42 is composed of two piston portions 46a and 46b positioned at the entry position.
The two moving blocks 44a and 44b are moved up and down according to the pressure difference applied to them by an operating mechanism which can be realized at a relatively low cost using the as a working fluid, so that the volumes of the two molding cavities 29a and 29b are reduced. Can be increased or decreased,
Thus, since the pressure applied to the two molding materials 48a and 48b accommodated in the two molding cavities 29a and 29b can be made uniform, the two molded products 50a having excellent quality can be obtained. , 50b can be realized at relatively low cost.

Moreover, in the compression molding die 10, as described above, two molded products 50 having excellent quality are provided.
The structure that enables simultaneous molding of the fixed mold 14 and the fixed mold 14
Therefore, as a press device for opening and closing the compression mold 10, any of the conventional structures conventionally used can be advantageously used,
There is no need to use a specially designed press device.

Accordingly, the compression molding die 10 according to this embodiment is
Is used, two target molded products 50a, 50b
However, it is always possible to simultaneously press-mold with a uniform pressing force, and the quality of the two molded products 50a and 50b can be effectively improved. It can be realized very advantageously without being burdened.

Although the specific configuration of the present invention has been described in detail above, this is merely an example, and the present invention is not limited by the above description.

For example, in the above embodiment, the pressure transmitting means connects the two cylinders 38a, 38b, the oil 42, which is a working fluid, housed therein, with the two cylinders 38a, 38b in a communicating state. A connecting pipe 40 to be connected and two piston members 46a and 46b protruding into the two cylinders 38 and 38b,
Although the pressure transmitting means is constituted, the pressure transmitting means is not limited thereto, and any pressure transmitting means having a structure capable of moving the two moving blocks 44a and 44b as the moving members into and out of the molding cavities 29 can be used. If
Any structure can be adopted.

In the specific example, the two cylinders 38a and 38b and the oil 4
2, connecting pipe 40, and two piston members 46a,
46b and two moving blocks 44a and 44 as moving members.
b is provided on the fixed mold 14, but it is also possible to provide the pressure transmitting means and the moving member only on the movable mold 12 or on both the fixed mold 14 and the movable mold 12. .

Further, the arrangement of the moving member and the pressure transmitting means with respect to the fixed mold 14 and the movable mold 12 is, of course, not limited to the one shown in the above-described embodiment.

In the above example, each moving block 4
Although the pistons 46 are integrally formed on the end face of the piston 4, the end portions of the respective moving blocks 44 are configured as piston portions, and the piston portions formed of such end portions are inserted into the respective cylinders 38. You may do so.

Further, in the above embodiment, the working fluid is composed of the oil 42. However, the working fluid freely flows between the two cylinders 38a and 38b through the connecting pipe 40, and the amount of storage in each cylinder 38 is reduced. Any working fluid may be used as long as it can reciprocate the pistons 46 in accordance with the increase or decrease. However, the pressure applied to each of the moving blocks 44a and 44b can be increased more reliably. For transmission, a material that does not change in volume even when compressed and has a small change in viscosity is advantageously used.

In the specific example, the molding material 48a,
As a material 48b, a soft sheet-like glass fiber reinforced resin material was used. However, the material of the molding material is not limited to this, and for example, powder or melt made of a single material of various resin materials is used. Alternatively, any molding material conventionally used for compression molding, such as a composite material obtained by adding and mixing various inorganic materials to such a powder or a melt, can be advantageously used.

In addition, in the above-mentioned specific example, an example is shown in which the present invention is applied to a compression mold in which two molded articles having the same shape can be simultaneously press-molded. It can be advantageously applied to any of the molds capable of simultaneously molding a plurality of molded articles,
For example, a compression mold capable of simultaneously molding three or more molded articles having the same shape, a compression mold capable of simultaneously molding two or more molded articles having different shapes, or two having the same shape. The above-mentioned molded articles and two or more molded articles exhibiting different shapes can also be advantageously applied to injection compression molding dies and the like which can be molded simultaneously, respectively.
Of course.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made, and any of such embodiments can be implemented in the present invention without departing from the spirit of the present invention. It is to be understood that they are included within the scope of the invention.

[0053]

As is apparent from the above description, in the molding die according to the present invention, a plurality of target molded products can always be simultaneously press-molded with a uniform pressing force. The quality of the plurality of molded articles can be effectively improved, and such quality improvement can be realized very advantageously without imposing a large economic burden. As a result, by using such a compression molding die, it is possible to economically and advantageously perform multi-piece or set-molding of molded products having higher quality.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an example of a compression mold according to the present invention.

FIG. 2 is an explanatory view showing an example of a molding process of a molded article using the compression molding die shown in FIG. 1, and shows a state where a molding material is set in a fixed mold.

FIG. 3 is an explanatory view showing another example of a molding step of a molded article using the compression molding die shown in FIG. 1, and shows a state where a molding material is being pressure-molded.

FIG. 4 is an explanatory view showing still another example of a molding step of the molded article using the compression molding die shown in FIG. 1, and shows a state in which the molded article has been removed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Compression molding die 12 Movable mold 14 Fixed mold 29 Molding cavity 38 Cylinder 40 Connecting pipe 42 Oil 44 Moving block 46 Piston part 48 Molding material 50 Molded product

Claims (2)

[Claims] 1. A fixed mold, and a movable mold that forms a plurality of mutually independent molding cavities between the fixed mold,
In a molding die configured to simultaneously mold a plurality of target molded products by press-molding molding materials contained in the plurality of molding cavities, at least one of the fixed mold and the movable mold On the other hand, a plurality of moving members are provided so as to be able to advance and retreat with respect to the plurality of molding cavities, respectively, and increase or decrease the volume of each of the plurality of molding cavities in accordance with the advance and retreat. Pressure transmitting means for connecting the plurality of moving members to each other so that the pressure applied to each of the plurality of moving members can be transmitted and received to and from the plurality of molding cavities in accordance with the difference between the pressures. By increasing or decreasing the volume of the plurality of molding cavities in accordance with the difference in pressure applied to each of the plurality of moving members, A molding die characterized in that the pressure applied to the molding material contained in each of the molding cavities can be made uniform. 2. The plurality of piston members connected to each of the plurality of moving members, the plurality of cylinder members accommodating the plurality of piston members, respectively, and The working fluid is accommodated, and the piston members are reciprocated by increasing / decreasing the accommodated amount, and the working fluid that causes the moving members to advance and retreat with respect to the molding cavities, respectively, and the plurality of cylinder members are interconnected in a communicating state. And a connecting member that allows the working fluid to flow freely between the plurality of cylinder members,
Activating the piston member connected to the one moving member in response to a pressure applied to one of the plurality of moving members, causing the working fluid to flow between the plurality of cylinder members through the connecting member. Thereby, the piston member connected to another of the plurality of moving members is configured to be actuated, and the pressure applied to each of the plurality of moving members is transmitted to each other, and The molding die according to claim 1, wherein the plurality of moving members can be advanced and retracted with respect to the plurality of molding cavities in accordance with a difference in pressure applied to each of the moving members.