JPH069921U - Mold - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a molding die that prevents air from being mixed into a product. [Structure] An annular cavity 8 is provided between the upper mold 1 and the lower mold 2.
Is formed. The pots 6 for placing the dough 9 are formed on the upper mold 1 at equal intervals. An injection hole 7 that connects each pot 6 and the cavity 8 is formed. The piston mold 3 has a plurality of pistons 4. The piston 4 of the piston type 3 is inserted into each pot 6. When the mold is clamped, the dough 9
Is injected into the cavity 8 and vulcanized and molded to obtain a product. In this case, since the pot 6 and the piston 4 are independently arranged for each of the injection holes 7, the dough 9 directly flows into the injection hole 7 during mold clamping. Therefore, the dough 9 is not injected into the cavity 8 together with the air existing in the gap in the pot 6, so that air does not enter the molded product.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a molding die, and more particularly, to a molding die capable of obtaining a product having a predetermined shape by vulcanizing and molding a cloth made of a rubber-like elastic material.

[0002]

[Prior art and its problems]

 Conventionally, a mold as shown in FIG. 4 is generally known as this type of mold. That is, the forming die shown in FIG. 4 is capable of coming into contact with and separating from each other, and the upper die 21 and the lower die 22 that cooperate with each other to form the cavity 28, and the piston die 23 provided on the upper die 22 side. The upper die 21 can be loaded with the dough 29, and the dough 29 in the pot 26 is cavity-equipped with the pot 26 into which the piston die 23 is vertically movably inserted. And a plurality of injection holes 27 that lead to 28.

In FIG. 4, the upper die 21 can contact and separate from the lower die 22. When the upper die 21 and the lower die 22 are fitted to each other, an annular shape is formed between the two dies 21 and 22. The cavity 28 is formed.

A pot 26 and an injection hole 27 are formed in the upper mold 21. The pot 26 is formed so as to open upward in the central portion of the upper mold 21, and an unvulcanized material 29 made of a rubber-like elastic material is placed on the bottom surface of the pot 26. is doing.

The upper die 21 has a plurality of injection holes 27, which are opened at the bottom surface of the pot 26 and allow the pot 26 to conduct downward, and are arranged at equal intervals. As a result, the cloth 29 placed on the pot 26 is guided to the cavity 28 via the injection hole 27.

A piston die 23 is provided on the upper die 21. At this time, the piston die 23 is vertically movably inserted into the pot 26 of the upper die 21, and when the ram pressure of a press machine (not shown) is used, the piston die 23 is moved downward to press the dough 29 in the pot 26. I am trying to add.

In the molding die configured as described above, first, the metal rings 30 and 31 that are integrally molded are placed at predetermined positions on the lower die 22, and then the upper die 21 and the lower die 22 are matched with each other. By doing so, the metal rings 30 and 31 are positioned in the cavity 28 while being sandwiched between the upper die 21 and the lower die 22.

Next, when the unvulcanized dough 29 is placed on the pot 26 of the upper die 21 and the die is clamped by a press machine (not shown), the piston die 23 presses the dough 29 in the pot 26 and presses it. Will be added.

Then, the dough 29 is guided to the cavity 28 through the injection hole 27 by the pressing force of the piston die 23, and the cavity 28 is filled with the unvulcanized dough 29. Then, the dough 29 is vulcanized inside the molding die to be molded in a state where the metal rings 30 and 31 are integrated and according to the shape of the cavity 28. As a result, the metal ring 30 is formed. With the vulcanized material 29 interposed between the metal ring 31 and the metal ring 31, an annular product can be obtained.

However, in such a conventional mold, there is a fear that air may be mixed into the product.

That is, since air remains in the pot 26 in which the dough 29 is placed, when the dough 29 is injected into the cavity 28, the inside of the pot 26 is pushed by the pressing of the piston die 23. There was a case where the air existing in the air was injected into the cavity 28 together with the cloth 29.

That is, for example, when the injection holes 27 for guiding the dough 29 in the pot 26 to the cavity 28 are formed on the bottom surface of the pot 26 on a relatively large circumference evenly, the dough 29 is put in the pot 26. When placed in the center of the pot 26, as shown in FIG. 4, the opening of the injection hole 29 faces the air present in the gap in the pot 26.

Therefore, when the mold is clamped in such a state, the dough 29 pressed by the piston mold 23 moves while being crushed outward from the central portion in the pot 26. As the dough 29 moves, the dough 29 is injected into the cavity 28 from the injection hole 27 while winding the air in the pot 26, so that the cavity 28 is filled with the air-containing dough 29. As a result, a product containing air is molded and causes defects.

Therefore, in order to prevent air from being mixed into the cavity 28 in this way, a method of setting the outer diameter of the piston die 23 to be sufficiently larger than the equally distributed diameter of the injection hole 27 may be considered. In this case, however, the volume of the pot 26 is inevitably increased, which causes a problem that the yield of the cloth 29 is reduced.

Further, since the molding pressure at the time of mold clamping is represented by the value of (output of press (mold clamping load) Ton number) / (projected area of piston mold (πd 2/4)), When the outer diameter is increased, there is also the problem that a press machine with a large output is required. (Note that d is the outer diameter of the piston type.)

Further, as another means for preventing the air from being mixed into the product, there is a method of performing so-called vacuum forming, but in this case, there is a problem that the equipment cost becomes high.

An object of the present invention is to solve the above-mentioned problems and to provide a molding die capable of obtaining a good quality product at low cost.

[0018]

[Means for solving problems]

 In order to solve the above problems, the present invention is capable of contacting and separating from each other, and an upper mold and a lower mold that cooperate with each other to form a cavity, and one of the upper mold and the lower mold. And a plurality of pots on which the dough can be placed, and an injection hole for guiding the dough in each of the pots to the cavity. The piston type is formed with a piston that is vertically movably inserted into each of the pots.

[0019]

[Action]

 This device adopts the above-mentioned means.When unvulcanized dough is placed in each pot and the mold is clamped, the dough is pressed by the piston of the piston type and guided to the cavity through the injection hole. After that, it is filled with this, and then the material is vulcanized and molded to obtain a product with a predetermined shape.

Here, in this invention, air is not mixed into the product.

That is, each injection hole for guiding the dough into the cavity is formed in a pair with the pot and the piston in an independent state. Therefore, when the mold is clamped, it is placed in the pot. The batter thus formed immediately flows into the injection hole and is injected into the cavity, which prevents the air existing in the pot from flowing into the injection hole.

In other words, by disposing the pot and the piston independently in the injection hole, the dough placed on the pot will be located on the opening of the injection hole, so that the piston is used when the mold is clamped. When the dough is pressed, the pressing force of its piston allows the dough to be directly injected into the cavity without entraining the air present in the pot, and as a result, air will be added to the molded product. Is not mixed in.

Further, along with this, if the outer diameter of the piston is suppressed to a small value, the volume of the pot can be minimized, so that the yield of the dough can be improved. It has become.

Further, when the outer diameter of the piston is reduced, the projected area of the piston is reduced and the molding pressure can be increased. Therefore, even if the diameter of the product is increased, a press with a small output can be used. It is possible to perform mold clamping using a machine.

[0025]

【Example】

 Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 is a view showing an embodiment of a molding die according to the present invention. That is, the forming die shown in FIG. 1 is capable of coming into contact with and separating from each other, and the upper die 1 and the lower die 2 which cooperate with each other to form the cavity 8 and the piston die provided on the upper die 2 side. 3, a plurality of pots 6 which can be placed on the upper mold 1 and can be placed on the upper mold 1, and the dough 9 in each of the pots 6 are introduced into the cavity 8. And the pistons 4 which are vertically movably inserted into the respective pots 6 are arranged in the piston mold 3 at equal intervals.

In FIG. 1, the upper mold 1 can contact and separate from the lower mold 2. When the upper mold 1 and the lower mold 2 are fitted to each other, an annular shape is formed between the two molds 1 and 2. The cavity 8 is formed.

In the upper mold 1, a plurality of pots 6 and a plurality of injection holes 7 are formed, respectively. The pots 6 are formed so as to open upward in the upper mold 1 and are arranged in 8 equal parts. The unvulcanized dough 9 made of a rubber-like elastic material is formed on the bottom surface of the pots 6. It is supposed to be placed.

The upper mold 1 is formed with a plurality of injection holes 7 that are open at the bottom surface of each pot 6 and that conduct the pot 6 downwardly so as to be located at equal intervals. As a result, the dough 9 placed on each pot 6 is guided to the cavity 8 via each injection hole 7.

A piston die 3 is provided on the upper die 1. As shown in FIGS. 2 and 3, this piston mold 3 is formed integrally with a disk-shaped pressing member 5 by providing pistons 4 projecting from one surface thereof in 8 equal intervals. At this time, the pistons 4 are arranged so as to correspond to the pots 6, and the pistons 4 are vertically movably inserted into the pots 6 of the upper mold 1, respectively.

At this time, when the ram pressure of a press machine (not shown) acts on the pressing member 5, the piston die 3 moves downward together with the pressing member 5 and applies pressure to the dough 9 in the pot 6. I have to.

Next, the operation of the above will be described.

This molding die is configured as described above. When the dough 9 is placed on the pot 6 of the upper mold 1 and then the mold is clamped, the dough 9 fills the cavity 8 and is vulcanized. As a result, a product having a predetermined shape can be obtained.

First, the metal rings 10 and 11 that are integrally formed are placed at predetermined positions on the lower die 2, and then the upper die 1 and the lower die 2 are aligned with each other, so that the metal rings 10 and 11 are , And is located in the cavity 8 in a state of being sandwiched between the upper mold 1 and the lower mold 2.

Next, the dough 9 in an unvulcanized state is placed on each pot 6 formed in the upper die 1, and the die is clamped by a press machine (not shown). The dough 9 in the pot 6 is pressed to apply pressure.

Then, the dough 9 is guided to the cavity 8 through the injection hole 7 by the pressing force of the piston 4, and the cavity 8 is filled with the unvulcanized dough 9. Then, the dough 9 is vulcanized inside the molding die to be molded in a state in which the metal rings 10 and 11 are integrated and in a shape corresponding to the shape of the cavity 8. As a result, With the rubber-like elastic body interposed between the metal ring 10 and the metal ring 11, an annular product as a whole can be obtained.

And, in the above-mentioned forming die, air is not mixed into the product.

That is, in this molding die, a plurality of pots 6 on which the dough 9 is placed are formed on the upper die 1, and the dough 9 communicating with each pot 6 guides the dough 9 in the pot 6 to the cavity 8. 7 and by providing each pot 6 with the piston 4 of the piston mold 3, the pot 6 and the piston 4 are arranged in pairs for each injection hole 7, so that the mold clamping is performed. At this time, the dough 9 in each pot 6 is directly injected into the cavity 8 through the injection hole 7, so that the air in the pot 6 does not flow into the injection hole 7. ing.

In other words, by disposing the pot 6 and the piston 4 independently for each of the injection holes 7, when the dough 9 is placed on the pot 6, the dough 9 will be Since the piston 4 presses the cloth 9 at the time of mold clamping, the cloth 9 comes to be directly pushed into the injection hole 7 by the pressure of the piston 4 so that the cloth 9 is introduced into the cavity 8. Like

At this time, the dough 9 pressed by the piston 4 flows into the injection hole 7 exclusively, so that the existence of the dough 9 causes the air existing in the gap in the pot 6 to be injected. It is designed to prevent it from flowing into the hole 7.

As a result, when the mold is clamped, the dough 9 is prevented from being injected into the cavity 8 in a state of containing air, so that air is prevented from being mixed into the product.

In the past, it was necessary to increase the outer diameter of the piston in order to prevent air from entering the product, but it is possible to prevent air from entering the product as described above. As a result, the outer diameter of the piston 4 can be set smaller, which allows the volume of the pot 6 to be minimized and the yield of the dough 9 to be improved. It can be done.

Further, since the molding pressure at the time of mold clamping is represented by (output of press machine (mold clamping load) Ton number) / (projected total area of piston mold (πnd 2/4)), By making the diameter small, it becomes possible to use a press machine with a small output. (Note that d is the diameter of the piston, and n is the number of pistons.)

In the above embodiment, the molding die for integrally molding the two metal rings 10 and 11 has been shown, but the presence or absence of the metal rings 10 and 11 is irrelevant. Also, the injection holes 7 do not necessarily have to be formed in equal distribution, and the number thereof is not limited.

Further, in the above embodiment, the molding die for obtaining one product is shown, but it is applicable to a so-called multi-cavity molding die. In this case, a plurality of injection holes may be formed for each of the formed cavities, and a pot and a piston may be provided independently for each injection hole.

[0046]

[Effect of device]

 As described above, according to the present invention, a pair of pot and piston are provided independently for each of the plurality of injection holes formed for injecting the dough into the cavity. Will be injected into the cavity without air entrapment, which can prevent air from entering the product and improve product quality.

Further, along with this, it becomes possible to set the outer diameter of the piston small, so that it becomes possible to reduce the projected area of the piston, thereby improving the molding pressure. it can. Therefore, even if the product diameter becomes large, it becomes possible to use a press machine with a small output.

Furthermore, if the projected area of the piston can be reduced, the volume of the pot can be suppressed to the necessary minimum, and the yield of the dough can be improved.

In this case, conventionally, in order to prevent air from entering the product, so-called vacuum forming, which requires a relatively high equipment cost, had to be performed, but in this invention, special equipment is used. Since there is no need for this, there is an effect that equipment costs can be kept low.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a molding die according to the present invention.

FIG. 2 is a view showing a piston die used in the forming die according to the present invention.

FIG. 3 is a diagram showing a view of the piston die shown in FIG. 2 as seen from the bottom surface.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 1, 21 ...... Upper mold 2,22 ...... Lower mold 3,23 ...... Piston mold 4 ...... Piston 5 ...... Pressing member 6,26 ...... Pot 7,27 ...... Injection hole 8, 28 ...... Cavity 9 , 29 …… Fabric 10, 11, 30, 31 …… Metal ring

Claims (1)

[Scope of utility model registration request] 1. An upper mold (1) and a lower mold (2) which can be brought into and out of contact with each other and cooperate with each other to form a cavity (8), and an upper mold (1) or a lower mold ( And a piston mold (3) provided on one of the molds of 2),
The dough (9) is provided on one mold where the piston mold (3) is provided.
Forming a plurality of pots (6) capable of placing the pots and an injection hole (7) for guiding the dough (9) in each pot (6) to the cavity (8), and forming the piston mold (3) A molding die characterized in that a piston (4) is inserted into each of the pots (6) so as to be vertically movable.