JP2000043065A - Molding of rubber product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve continuous mass production and to enhance the quality of a product by highly accurately and easily arranging a rubber raw material in a mold. SOLUTION: A rubber raw material (G) is molded into a rubber raw material W having a preparatory shape corresponding to the shape of the cavity 14 of a secondary mold 8 by a primary mold to be held to a raw material mold 3 and the rubber raw material W having the preparatory shape is released from the raw material mold 3 to be fitted in the secondary mold 8 and molded into the final molded product corresponding to a product by the secondary mold 8. By this constitution, the control of the wt., dimension or the like of the rubber raw material (G) becomes easy and the rubber raw material (G) can be easily molded into the rubber raw material W having the preparatory shape without taking labor and the highly accurate adjusting work of various apparatuses is also dispensed with and a handling worker can easily perform work and continuous mass-production can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a rubber product for molding a rubber product.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed as a method of molding a product using a rubber-like elastic body.
For example, there is a molding method called compression molding in which a rubber material is placed in a cavity of a mold, heated and pressurized to fluidize the rubber material and vulcanize to a desired shape.

In compression molding, a rubber material is processed into, for example, a strip material, a round material, a pipe material, a sheet material, or the like so as to be suitable for a molding die to be used. The respective processing steps will be described below.

The strip cloth S is cut by a cutter blade into rubber cloth G sent to a feed roller pair by a shearing machine, and the separated rubber cloth G by a slitter machine.
Is cut by a slitter blade so as to have a plurality of feeding directions, and is processed into a strip material S.

[0005] The round cloth T is extruded from a rubber cloth G by an extruder, processed into a round cloth T having a circular cross section, and cut into a predetermined thickness by a round cloth cutter to be processed into a round cloth T.

Further, the pipe cloth U is extruded while warming the rubber cloth G with an extruder, and the extruded rubber cloth G is evenly dispersed in a circumferential direction by a spider.
A base for determining the outer diameter of the pipe cloth U and the pipe cloth U
Is extruded between cores to determine the inner diameter of the pipe, and is processed into a pipe cloth U.

[0007] Then, the pipe cloth U sent out by the feed roller pair at a constant speed by the shearing machine is cut by the upper blade and the lower blade. The cut pipe fabric U is deformed by sticking or crushing of the cut pipe fabrics U together. Then, the pipe fabric U cut by the straightening machine is separated and straightened, and processed into the pipe fabric U.

The sheet cloth V is processed by an extruder, an adjusting roll, a metal detector and a sheet cloth winding machine, and the separated rubber cloth G is formed into a sheet cloth V by the extruder and the adjusting roll. After being stretched and subjected to metal detection, it is wound into a roll and processed into a sheet material V.

A sheet material V used for a large product is produced by feeding a roll-shaped sheet material V with a pair of feed rollers and cutting it with a cutter blade. In addition, a sheet material V used for a small product is produced by feeding a roll-shaped sheet material V with a pair of rollers using a mini-roll machine, and is perforated with a cutter blade that is a perforated rotary blade.

[0010] In the next step of molding a rubber product, the doughs S, T, U,
V is manually placed on the mold opening surface of a mold that has been opened to mold a rubber product, and the mold is closed at a predetermined heating, pressurizing pressure, and pressurizing speed to form a molded product.

FIG. 9 is a perspective view showing a molding die and a cloth.
As described above, in the case of a molding die for molding a product such as an O-ring, for example, there is a digging die 133 (see FIG. 9 (a)) capable of taking a large number of products, and FIG. The strip material S used for forming the small-sized product and the sheet material V used for forming the mass-produced product are placed, the hydraulic pressure is controlled by a compression molding machine to compress the forming die, and vacuum forming is performed to form the formed product. .

Further, a round piece type 134 for picking up one product.
a, 134b (refer to FIG. 9 (c)), a pipe cloth U used for small to medium diameter mass-produced products shown in FIG. 9 (d), or a strip cloth S or a round cloth T used for large diameter small articles. A molded article is molded using In this case, the strip cloth S or the round cloth T is formed into a ring by a joint 135.

Next, the closing of the mold will be described with reference to a molding die using the sheet material V. FIG. 10A is a perspective view showing a molding die on which the sheet material V is placed, FIG. 10B is a cross-sectional view showing an enlarged cross section of the molding die, and FIG. FIG. 10D is a perspective view showing the mold in a compressed state.

A molding die such as a digging die 133 for finally forming a product shown in FIG.
5 and the second mold 136, burrs 137, lattice grooves 138,
An outer burr groove 139, a cavity 140, and an inner burr groove 141 are provided. The sheet cloth V is placed so as to cover all the mold opening surfaces provided with the respective cavities 140, and the compressed sheet cloth V is placed inside the cavity 140. Flow in. Here, as shown in FIG. 10C, the thickness t of the sheet material V is set to t <R × 2 in relation to the cavity inner diameter R in order to easily perform the molding.

When the molding die 133 is compressed, the sheet cloth V flows outward from the center of the molding die 133 as shown by the arrow in FIG. Molding.

The molded article thus formed is shown in FIG.
As shown in FIG. 1, the O-ring 142 is formed into a sheet shape connected by burrs. Then, burrs on the inside of the O-ring 142 are extracted with an inner diameter punch using a punching finisher, and only the O-ring 142 is extracted with an outer diameter punch to collect the O-ring 142.

[0017]

However, in the case of the above-mentioned prior art, a high precision is required for the feeding speed of various devices, the cutting position, the pressing force of the roller pair, and the like.
Since it is difficult to control the weight and dimensions of the rubber material, the operators who handle those devices require a high level of skill and skill, and require the necessary amount of rubber material in the cavity of the mold. Since it takes time to place them one by one manually, continuous mass production was not possible.Therefore, a production method capable of simpler, more accurate, and continuous mass production was desired. Was rare.

When processing the pipe cloth U,
There is a step of correcting the pipe fabric U after processing, which requires time and effort.

Further, in the case of molding using the sheet material V, even if the mold is evacuated in order to remove air inside the cavity, the sheet material V softened by heat seals the cavity, and the cavity is sealed. Air may remain inside.

Then, as shown in FIG. 10D, since the amount of flow of the sheet cloth V to flow outside is large, the flow direction and the internal pressure of the cavity 140 become unstable. Also,
Since a large pressing force is required to increase the amount of flow of the sheet cloth V to the outside, a large number of products in the molding die are restricted.

When the flow rate of the sheet material V is large, the molded product has different thicknesses a and b between the center and the outside, as shown in FIG. The thickness becomes larger than the outer thickness b, and the product dimensions of a multi-cavity product vary. In addition, if the product dimensions of the multi-cavity product are varied as described above, when performing the separation finishing work of the product, the burr at the central part is too thick and the punching of the inner diameter punch and the outer diameter punch is poor, or Causes a stoppage of a punching finisher for punching out a product.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to arrange rubber dough in a molding die with high precision and ease, thereby achieving continuous mass production. Another object of the present invention is to provide a method for molding a rubber product that improves the quality of the product.

[0023]

According to the present invention, in order to achieve the above object, a rubber molding is formed into a primary molded article by a primary molding die having a dough mold capable of holding a molded article. And
The dough mold holding the primary molded product is held in the cavity position of the opened secondary mold by the dough mold.
The position of the next molded article is arranged correspondingly, the primary molded article is released from the dough mold, and is put into the cavity of the secondary molding die, and the primary molded article is placed in the secondary molding die. Is formed into a secondary molded product corresponding to the product.

Therefore, the rubber material is made into a primary molded product before being formed into a secondary molded product corresponding to the product, so that the primary molded product is made uniform by the primary molding die even if it is repeatedly molded. It can be molded into the same shape with the same amount, the management of the weight, dimensions, etc. of the rubber material is easy, it can be easily molded into a primary molded product without hassle, and there is no need for high-precision adjustment work of various devices. Work can be performed easily, and continuous mass production can be achieved.

In addition, the molding of the primary molded article by the dough mold
Holding and disposition can be performed easily, the secondary molding process can be easily performed, continuous mass production can be achieved, and a plurality of primary molded products can be molded at once using a primary molding die.
When a plurality of primary molded products are arranged in a secondary molding die and the secondary molding is performed in the dough mold, since the plurality of primary molded products are arranged in the secondary molding die, the flow of each primary molded product due to compression. Since the amount of forming is small, the compression force for compressing the secondary mold can be reduced, and since the primary molded product is dispersedly arranged in each cavity of the secondary mold, the central part of the secondary mold is formed. The inner pressure of each cavity becomes uniform on the outside and the outside, so that a product having a uniform thickness can be formed, and the quality of the product can be improved.

The primary molding die includes a dough mold having holes penetrating on both sides, a filling mold for filling a rubber dough into the holes from one surface of the dough mold, and the other of the dough molds It is preferable that the primary molded product is held in the holes of the dough mold.

[0027] Thus, the dough mold is sandwiched between the filling mold and the holding mold, and the rubber mold is filled from the filling mold to easily form the primary molded product and easily hold the primary molded product on the dough mold. be able to.

[0028]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The material, shape, relative arrangement, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

As shown in FIG. 1, a rubber material G is formed into a preformed rubber material W as a primary molded product by a primary molding tool 1 before vulcanization molding with a secondary molding die. In the present embodiment, it is used for molding an O-ring as a rubber product. Here, the rubber material W in the prepared shape is in an unvulcanized state.

However, the shape of the rubber product to be molded is not limited to the O-ring, but can be applied to any other shape. Subsequent molding is possible. Further, as the primary molding die, various types such as a molding die and a drawing die can be used.

First, the separated rubber material G is formed into a rubber material W of a preparatory shape by the primary molding die 1. FIG. 1A shows a cross-sectional view of the primary molding die 1, and the configuration will be described.

The primary mold 1 includes an upper mold 2 as a filling mold,
It has a roughly three-layer structure having a dough mold 3 and a lower mold 4 as a holding mold. In FIG. 1A, a state in which all the molds constituting the primary molding die 1 are closed, a flowable rubber material G is held inside the holes 5 of the material mold 3, and the primary molding is performed. It is.

The dough mold 3 has holes 5 corresponding to the respective O-ring-shaped cavities provided on the secondary molding mold for molding a rubber product, penetrating both sides. The hole 5 has a conical taper shape in which the diameter is reduced from the lower mold 4 side to the upper mold 2 side. When the lower mold 4 is closed, the opening of the lower mold 4 is closed, so that the cone 5 has a preparatory shape. Process into rubber cloth W. However, even when an O-ring is formed as a rubber product, the preparatory shape is not limited to this trapezoidal trapezoidal shape, and various shapes such as a cylindrical shape can be applied.

Then, the rubber material G flows from the nozzle portion 6 of the upper die 2 into the opening of the upper die 2 facing the upper die 2 on the surface facing the upper die 2, and is filled in the holes 5.

On the other hand, the upper mold 2 is made of the separated rubber cloth G
A pressurizing chamber 7 for holding and pressurizing is provided, a nozzle section 6 is connected to the pressurizing chamber 7, and the lower mold 4 is provided with a surface for closing the cloth mold 3 and the mold on a flat surface.

An outline of a primary molding step of molding into a rubber dough W of a preparatory shape using the primary mold 1 will be described. The dough mold 3 and the lower mold 4 are completely closed, and the upper mold 2 is closed. The rubber cloth G disposed in the pressurizing chamber 7 of the upper mold 2 is heated or the like, and the nozzle 6 is inserted into the hole 5 whose opening on the lower mold 4 side is closed by the lower mold 4. The fluidized rubber material G is injected into the rubber material W and processed into a rubber material W having a prepared shape.

After molding into the preformed rubber cloth W, the upper mold 2 and the lower mold 4 are opened and separated from the cloth mold 3, and the cloth mold 3 holds the prepared rubber cloth W in the holes 5. It can be moved as it is (see FIG. 1B). Then, the uncured rubber cloth W of the prepared shape is placed in a cloth mold 3.
(See FIG. 1 (c)), and the rubber cloth W of the prepared shape is placed in a secondary molding die for molding a final molded product as a secondary molded product corresponding to a rubber product described below.

FIG. 2 shows a secondary molding die, which is formed into an O-ring by using a preformed shaped rubber material W.
Next, the molding step will be described.

As shown in FIG. 2 (a), a rubber material W of the preparatory shape is placed on the O-ring one by one on the mold opening surface of the secondary molding die 8 for removing a large number of products of the O-ring. By arranging a plurality of cavities corresponding to the respective cavities and closing the mold at a predetermined heating, pressurizing pressure and pressurizing speed, the rubber cloth W of the preparatory shape flows in each outer diameter direction to form an O-ring. I do.

As shown in FIG. 2 (b), the secondary molding die 8 has a burr 11 on the first die 9 and the second die 10,
2, each of which has an outer burr groove 13, a cavity 14, and an inner burr groove 15;
The rubber cloth W of the preparation shape is arranged one by one.

At the time of this molding, a vacuum is drawn to absorb the air on the superposed mold opening surface of the secondary molding die to prevent air accumulation in the cavity 14 and the like. Molds an O-ring 14
Is smaller than the inner diameter of the secondary mold 8, the diameter is expanded only after the secondary mold 8 is closed and compressed, and flows into the cavity 14.
The air in the cavity 14 is removed by evacuation, so that the final molded product X as an ideal secondary molded product having no defect without leaving the air can be formed.

In this secondary molding, the cavity 14
The rubber cloth W of the preparatory shape is arranged for each, and the internal pressure is the same as that of the rubber cloth W of each preparatory shape. Not only is the amount smaller than in the past, but also the required pressure is less than in the past.

The final molded product X thus molded
Are O-rings 16 as products as shown in FIG.
The outer burrs are connected. This O-ring 1
Regardless of the position of the secondary mold 8, the thickness of the secondary mold 6 does not vary, and an O-ring of uniform quality can be provided.

As shown in FIG. 4, for example, as shown in FIG. 4, when a plurality of pieces are prepared in the same manner as in the present embodiment, the preformed rubber cloth W is arranged at a position corresponding to each cavity. It may be a sheet molded product in which a rubber material W having a trapezoidal trapezoidal preparatory shape as a primary molded product is continuous with a thin sheet portion as a connecting portion (see FIG. 4A).

In this case, by forming a thin sheet portion in the primary mold 1 at the same time, a sheet molded product in which a plurality of rubber doughs W of a plurality of prepared shapes are continuously formed can be easily formed. The ready-made rubber cloth W can be handled at a time, and the handling is easy, and the arrangement on the secondary molding die 8 is easy.

When a single O-ring is to be obtained as a rubber product, a ring-shaped preparation shape corresponding to the cavity can be formed (see FIG. 4B).

Using the primary molding die 1 described in the present embodiment with reference to FIGS. 5 to 7, a preformed rubber material W is formed, and the O-ring is formed using the preformed rubber material W. A molding method for performing multi-cavity will be described.

FIG. 5 shows a process 1 for forming a rubber material W having a preparatory shape.
FIG. 6 shows a secondary molding step of setting the preformed shaped rubber material W in a compression molding machine and vulcanizing and molding,
FIG. 7 shows a blanking step of finishing the final molded product X into an O-ring as a product.

The primary molding step will be described below as steps A1 to A5, the secondary molding step as steps B1 to B3, and the punching and finishing step as steps C1 and C2.

First, the primary molding step will be described with reference to FIG.

(Step A1) The dough mold 3 provided with the plurality of cavities 5 of the preparatory shape corresponding to the plurality of cavities 14 of the secondary mold 8 is removed from the upper mold 2 and the lower mold 4 of the primary mold 1. The rubber cloth G is disposed in the pressure chamber 7 of the upper die 2 (see FIG. 5A).

(Step A2) The upper mold 2, the fabric mold 3, and the lower mold 4 are closed, and the holes 5 of the fabric mold 3 are filled with the rubber fabric G to form a rubber fabric W of a prepared shape (FIG. 5). (B)).

(Step A3) The upper mold 2, the fabric mold 3, and the lower mold 4 are opened, and the rubber mold W in the prepared shape is held in the fabric mold 3 (see FIG. 5C).

(Step A4) The dough mold 3 is prepared by disposing the rubber dough W in the prepared shape at a position on the second mold 10 corresponding to the position of the cavity 14 of the second mold 8 provided in the compression molding machine. Further, the dough mounting device 17 provided with an extruding portion on the dough mold 3 for separating the prepared shaped rubber dough W from the dough mold 3, and the extruding portion is provided with the prepared shaped rubber dough W having the hole 5.
(See FIG. 5D).

(Step A5) The rubber dough W of the preparatory shape held by the dough mold 3 at the extruding portion of the dough mounting device 17 is extruded into the second mold 10 of the secondary molding die 8 and released from the dough mold 3. The dough is placed by placing the rubber dough W in the prepared shape corresponding to each cavity 14 of the mold 10, and the dough mold 3 and the dough mounting device 17 are removed from the compression molding machine (see FIG. 5 (e)).

At step A5, the primary molding step is completed.
In the present embodiment, step A
In 5, the cloth mounting device 17 prepares the rubber cloth W of the prepared shape.
Was extruded and placed on the second mold 10 of the secondary mold 8 at the same time, but the present invention is not limited to this, and separate steps may be used.

Here, a compression molding machine that holds the prepared secondary molding die 8 will be briefly described. The compression molding machine
The hydraulic pump is operated by the motor to generate high-pressure oil in the cylinder, the ram is raised by the high-pressure oil, and the ram and the head perform pressure compression.

A heat insulating material is provided between the ram and the head.
An upper hot plate, a lower hot plate, a secondary mold 8 and a slide plate are provided. Among them, the upper hot plate and the lower hot plate are provided with heaters for heating the secondary mold 8.

Next, the secondary molding step will be described with reference to FIG.

(Step B1) The first mold 9 and the second mold 10 of the secondary molding die 8 are combined (see FIG. 6A).

(Step B2) The ram of the compression molding machine is raised, the secondary molding die 8 is closed, and vulcanization molding is performed by applying pressure. At this time, the rubber cloth W in the prepared shape is fluidized by conduction of heat from the upper heating plate and the lower heating plate (see FIG. 6B).

(Step B3) The rubber material W of the preparatory shape fully wraps around each cavity 14, and when the molding is completed, the secondary molding die 8 is opened and the final molded product X is taken out (FIG. 6 ( c)).

Next, a punching finishing step for finishing the final molded product X into an O-ring of the product will be described with reference to FIG.

(Step C1) First, the molded product X is pulled out of the inner burr of the O-ring placed on the table 35 by the inner diameter punch 34 (see FIG. 7A).

(Step C2) Next, the O-ring 16 is pulled out by the outer diameter punch 36, and the O-ring 16 is recovered (see FIG. 7B).

As described above, the primary molding die 1 and the steps described in the respective steps make the primary molding die 1
Since the amount and shape of the rubber material W of the preformed shape as the next molded product have already been set, the size, amount, etc. of the rubber material W of the preformed shape can be easily controlled, and various devices have high precision. No special adjustment work is required, so that the worker does not require a high level of skill and skill, and further reduces the number of molding steps required until the rubber material W is formed into a preformed shape suitable for the secondary molding die 8. be able to.

Instead of manually placing each of the preformed rubber cloths W in the secondary molding die 8, a plurality of preformed rubber cloths W are prepared at once by the cloth mold 3 and the cloth mounting device 17. W can be arranged in the secondary mold 8, which enables continuous mass production.

As a specific example, when a large number of products are taken, conventionally, 35.50 g of rubber cloth is used.
8.14 g (44 pieces) of products were taken out, and the yield was 23%. In the case of applying the present embodiment, 8.14 g (44 pieces) of products were taken out with 22.00 g of rubber cloth. The yield can be improved to 37%.

Since the rubber cloth W having the improved yield and the preparatory shape is dispersed and arranged in each of the cavities 14 of the secondary molding die 8, the amount of the rubber cloth fluidized and moved is reduced as compared with the conventional case. The compression force of the compression molding machine can be suppressed to a low output.

Further, by dispersing and arranging the rubber doughs W of the preparatory shape, the internal pressure and the flow in the outer diameter direction applied to the rubber doughs W of the preparatory shape become uniform during the compression molding. Can be molded to a thickness of
The dimensions of products such as O-rings are also uniform, and products with excellent quality can be formed.

Furthermore, if the product is formed to a uniform thickness as described above, the thickness of the burrs is also uniform when the product is separated and finished. Alternatively, it is possible to prevent the finishing machine that performs the punching operation from stopping.

The above steps can be automated. FIG. 8 is an image diagram showing a compression molding machine that forms a final molded product X by molding a rubber material W of a preparatory shape from a rubber material G in a series of operations. May be possible.

[0073]

The present invention relates to a primary molding die having a dough mold capable of holding a molded product, wherein a rubber dough is formed into a primary molded product, and the dough mold holding the primary molded product is formed into a mold. The position of the primary molded product held by the dough mold is arranged in correspondence with the cavity position of the opened secondary mold, and the primary molded product is released from the dough mold and put into the cavity of the secondary mold. By molding the primary molded product into a secondary molded product corresponding to the product using a secondary molding die, the rubber material is converted into a primary molded product before being molded into a secondary molded product corresponding to the product. The primary molded product can be molded in the same shape with a uniform amount of rubber material even if it is repeatedly molded by the primary molding die, and the management of the weight, dimensions, etc. of the rubber material is easy, and the primary molded product is easy and hassle-free. Can be molded
High-precision adjustment work of various devices is not required, and a worker who handles the work can easily perform the work, and continuous mass production can be achieved.

Further, the molding and forming of the primary molded article by the dough mold
Holding and disposition can be performed easily, the secondary molding process can be easily performed, continuous mass production can be achieved, and a plurality of primary molded products can be molded at once using a primary molding die.
When a plurality of primary molded products are arranged in a secondary molding die and the secondary molding is performed in the dough mold, since the plurality of primary molded products are arranged in the secondary molding die, the flow of each primary molded product due to compression. Since the amount of forming is small, the compression force for compressing the secondary mold can be reduced, and since the primary molded product is dispersedly arranged in each cavity of the secondary mold, the central part of the secondary mold is formed. The inner pressure of each cavity becomes uniform on the outside and the outside, so that a product having a uniform thickness can be formed, and the quality of the product can be improved.

The primary molding die includes a dough mold having holes penetrating on both sides, a filling mold for filling the rubber dough from one side of the dough mold, and a hole on the other side of the dough mold. The primary molded product is provided with holes in the dough mold, so that the dough mold is sandwiched between the filling mold and the holding mold, and is easily filled with the rubber dough from the filling mold. The primary molded article can be easily held on the dough mold while the primary molded article is molded.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing a primary mold.
FIG. 1B is a cross-sectional view showing a dough mold of a primary molding type holding a preformed shaped rubber dough, and FIG. 1C is a perspective view showing a preformed shaped rubber dough.

FIG. 2A is a perspective view showing a secondary mold.
FIG. 2B is a cross-sectional view showing the secondary mold.

FIG. 3 (a) is a plan view showing a final molded product,
FIG. 3B is a sectional view showing the final molded product.

FIG. 4 is a perspective view showing an example of another preformed shaped rubber material.

FIG. 5 is a model diagram showing a primary molding step of molding a rubber material having a preparatory shape.

FIG. 6 is a model diagram showing a secondary molding step of molding a final molded product using a preformed shaped rubber material.

FIG. 7 is a model diagram showing a punching / finishing process for extracting only a product from a final molded product.

FIG. 8 is a partially cutaway model diagram showing a compression molding machine for forming a rubber material of a preparatory shape from a rubber material by a series of operations, and further forming a final molded product.

9 (a) is a perspective view showing a digging mold, FIG. 9 (b) is a perspective view showing a strip material and a sheet material, and FIG. 9 (c) is a round piece type. FIG. 9D is a perspective view showing a pipe fabric, a strip fabric, and a round fabric.

10 (a) is a perspective view showing a digging mold, FIG. 10 (b) is a cross-sectional view showing the mold, and FIG. 10 (c) is an enlarged view of a cavity. FIG. 10D is a cross-sectional view, and FIG. 10D is a perspective view showing the molding die during compression.

FIG. 11A is a perspective view showing a conventional molded product, and FIG. 11B is a cross-sectional view showing a conventional molded product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Primary molding die 2 Upper die 3 Fabric die 4 Lower die 5 Air hole 6 Nozzle part 7 Pressurization room 8 Secondary molding die 9,135 One die 10,136 Second die 11,137 Burr stay 12,138 Grid groove 13 , 139 Outer burr groove 14, 140 Cavity 15, 141 Inner burr groove 16, 142 O-ring 17 Dough mounting device 34 Inner diameter punch 35 units 36 Outer diameter punch 133 Drilling type 134a, 134b Round piece type G Rubber material J Joint S Strip Dough T Round dough U Pipe dough V Sheet dough W Rubber dough of primary shape (primary molded product) X Final molded product (secondary molded product)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F201 AA45 AM32 BA06 BC01 BC12 BD02 BQ11 BQ12 BQ14 4F204 AA45 AM32 FA01 FA18 FB01 FF01 FF36 FF49 FQ15

Claims (2)

[Claims] 1. A rubber mold is formed into a primary molded product with a primary mold having a fabric mold capable of holding a molded product, and the fabric mold holding the primary molded product is opened. The position of the primary molded product held by the dough mold is arranged so as to correspond to the cavity position of the secondary mold, and the primary molded product is released from the dough mold and the dough is placed in the cavity of the secondary mold. In the secondary molding die, the primary molded product corresponds to the product 2
A molding method of a rubber product, which is molded into a next molded product. 2. The dough mold having a hole penetrating on both sides thereof, a filling mold for filling a rubber material into the hole from one side of the dough mold, and the dough mold. A mold for closing the hole on the other surface of the rubber mold, wherein the primary molded product is held in the hole of the dough mold. Method.