JPH0539919U - Mold - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a molding die which facilitates removal of burrs formed at the time of molding a product and can automate the process. [Structure] The molding die is composed of a first die 1, a second die 2 and a third die 3, which can be brought into contact with or separated from each other. The first mold 1 has a flow hole 5 in the center. The second mold 2 forms the flow chamber 6 and the injection hole 7, and the pin 4
Are arranged so that they can appear and disappear. The cavity 9 is formed in the third mold 3. When the mold is clamped, the flow hole 5 is electrically connected to the cavity 9 through the flow chamber 6 and the injection hole 7. The burr formed in the flow chamber 6 at the time of molding can be easily peeled off from the second mold 2 by protruding with the pin 4. This allows the burr to be removed manually, which has been conventionally done manually.

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 automating the process.

[0002]

[Prior art and its problems]

 Conventionally, there is a mold as shown in FIGS. 6 and 7 as a mold for obtaining a product 65 in which an elastic body 65b is integrally molded on the outer peripheral portion of an annular metal ring 65a as shown in FIG. 10, for example. ..

FIG. 6 is a diagram showing a mold clamping state of the molding die, and FIG. 7 is a diagram showing a mold opening state. The molding die shown in FIG. 6 and FIG. 7 has an injection pot 56 for injecting an unvulcanized elastic material into the mold, a first die 41 having an injection hole 47, and a die for contacting the first die 41. A second die 42 that is spaced apart and has a cavity 49 formed therein, and a second die 42 that is fitted inside the second die 42 and that cooperates with the first die 41 and the second die 42 to hold the metal ring 65 a. 3 type 43.

In FIG. 6 and FIG. 7, the first die 41 defines a cavity 49 formed in the second die 42 when it abuts against the second die 42. In addition to having an inlet pot 56, an inlet hole 47 for electrically connecting the inlet pot 56 and the cavity 49 of the second mold 42 is formed at a plurality of locations.

An unvulcanized elastic material is placed on the injection pot 56 of the first mold 41. By inserting the piston 55 into the injection pot 56 from above and applying pressure, The elastic material in the pouring pot 56 flows into the cavity 49 of the second mold 42 through the pouring hole 47.

The second mold 42 has a cavity 49 for molding the elastic body 65b of the product 65 formed in a ring shape in the inner part, and a fitting part 69a formed in the upper surface, and the fitting part 69a. By fitting the bottom portion of the first die 41 to the bottom surface of the first die 41, the bottom surface of the first die 41 abuts against the top surface of the second die 42 and the cavity 49 is partitioned by the bottom surface of the first die 41. ing.

Further, a through hole 50 is formed in the center of the second mold 42 in the axial direction of the cavity 49, and a metal ring 65 a is engaged with the peripheral edge of the upper end opening of the through hole 50. I am allowed to do it. At this time, the engaging portion of the metal ring 65a in the second mold 42 connects the cavity 49 and the through hole 50 so that one end of the metal ring 65a can be positioned in the cavity 49. deep.

The third mold 43 is fitted into the ring through hole 50 of the second mold 42 from below. The third die 43 has a stepped portion 43a formed on the upper portion thereof, and when the die is clamped, the stepped portion 43a and the first die 41 sandwich and hold the metal ring 65a.

With the above-described configuration, in this molding die, first, the metal ring 65a is arranged on the second die 42, and then the first die 41, the second die 42, and the third die 43 are clamped. Thus, the first die 41 to the third die 43 cooperate with each other to hold the metal ring 65a and hold it in the die.

Next, the unvulcanized elastic material placed in the injection pot 56 of the first die 41 is pressed by the piston 55, so that the elastic material is transferred to the second die 42 through the injection hole 47. It flows into and is filled in the cavity 49, and then the elastic material is vulcanized and molded to be integrally molded with the metal ring 65b.

After a predetermined time has passed after the mold is clamped, the mold is opened as shown in FIG. At this time, in the injection pot 56 and the injection hole 47 of the first mold 41, since the elastic material remaining after the mold is clamped is vulcanized and molded, the burr 66 should be removed in preparation for the next molding. (Fig. 8).

On the other hand, as shown in FIG. 9, the second mold 42 inserts a product projecting pin 69 from below the through hole 50, and engages the product projecting pin 69 with the lower end part of the metal ring 65 a at the upper outer peripheral edge part. By pushing up together, the elastic body 65b formed of an elastic material can be taken out from the cavity 49 of the second mold 42 together with the metal ring 65a, and the product 65 can be obtained. ing.

However, in such a conventional forming die, the burr 66 formed in the first die 41 cannot be removed without manual work.

That is, the burrs 66 formed in the injection pot 56 and the injection hole 47 of the first die 41 are such that when the elastic material in the unvulcanized state is vulcanized and formed, the elastic material is a wall surface of the first die 41. Since it is obtained in a state of being adhered to, it was difficult to peel off and difficult to remove.

Therefore, it is very difficult to remove the burr 66 from the first die 41 by a mechanical process. Therefore, the removal work of the burr 66 must be performed manually, which is labor intensive. Also, it took a lot of time and was a problem.

In addition, since the mechanical work cannot be performed in this way, there is a risk that the molds may hit the peripheral members during the work and damage the molds, and the quality of the product can be stabilized. There was a problem that it would be difficult.

The present invention can solve the above problems and mechanically automate the molding process of a product, and at the same time, reduce product defects, improve quality, and improve productivity. It is an object of the present invention to provide a molding die that can be improved.

[0018]

[Means for solving problems]

 In order to solve the above problems, the present invention comprises a first mold, a second mold, and a third mold which can be respectively brought into contact with and separated from each other. A forming die positioned between the first die and the third die, the first die having a flow hole, and a flow chamber which is in communication with the flow hole in cooperation with the first die. And a third mold having a cavity that communicates with the flow chamber of the second mold. It adopts the means that the above-mentioned pin is projected and moved when it is opened. Further, the pin has a push-up portion formed at an end thereof, and the push-up portion peels off a burr formed in the second type flow chamber during molding. The type 1 circulation hole is formed at the center.

[0019]

[Action]

 This invention adopts the above-mentioned means, and after the first mold, the second mold, and the third mold are clamped, the unvulcanized elastic material is injected from the through hole of the first mold. Will flow into the third mold cavity through the second mold flow chamber.

Then, the elastic material is filled in the cavity and then vulcanized and molded, whereby the elastic material is molded by the cavity and a product is obtained.

The burr formed in the second mold flow chamber after molding is easily separated from the second mold by the pin.

That is, the burr formed in the distribution chamber adheres to and adheres to the second mold, but the pin movably provided in the distribution chamber is pushed up by the protrusion pin when the mold is opened. By doing so, the burr is pushed up by the pin and peeled off from the second mold, which makes it easy to remove the burr.

Therefore, conventionally, the burr removal work had to be performed manually, but according to the present invention, it is possible to remove the burr in a mechanical process and to automate the process. You can do it.

[0024]

【Example】

 An embodiment of the present invention shown in the drawings will be described below. FIG. 1 is a view showing an embodiment of the present invention, and is an overall structure including a first die, a second die, and a third die which are molding dies, and press equipment parts and a heating plate which are peripheral equipments thereof. Shows a schematic diagram.

That is, in FIG. 1, the first die 1, the second die 2 and the third die 3 are molding dies, the piston 15 and the distribution board 13 are press equipment parts, and 24 is a heating board.

The first mold 1, the second mold 2, and the third mold 3 are fixed inside the plate-shaped first mold plate 21, second mold plate 22, and third mold plate 23, respectively. The first die plate 21, the second die plate 22, and the third die plate 23 are brought into contact with and separated from each other to clamp the first die 1, the second die 2, and the third die 3, and You can open it.

In addition, the injection plate 16 and the injection nozzle 14 are provided on the distribution plate 13 which is a part of a press device that clamps the mold in cooperation with the hot platen 24 and presses the mold in the clamped state. The unvulcanized elastic material placed on the injection pot 16 is injected by the piston 15 into the mold through the injection nozzle 14.

FIG. 2 shows a main part of the molding die in FIG. That is, the molding die shown in FIG. 2 is separable from the press device and the heating plate 24, and has a flow hole 5 that can communicate with the injection nozzle 14 of the distribution plate 13 which is a part of the press device. The first mold 1 and the second mold 2 having the flow chamber 6 and the injection hole 7 which are in communication with the flow hole 5 when contacting the first mold 1 and the cavity 9 are formed. , A third die 3 that holds the metal ring 25a in cooperation with the second die 2, and the pins 4 are arranged in the second die 2 in a retractable state.

In FIG. 2, the first mold 1 is formed with a through hole 5 penetrating the central part thereof, and one opening of the through hole 5 is formed in the injection nozzle 14 of the distribution board 13 at the time of mold clamping. Further, the other opening of the circulation hole 5 is positioned so as to open in the circulation chamber 6 of the second mold 2, so that the injection nozzle 14 of the distribution board 13 can be connected to the second mold 2 through the circulation port 5. It is adapted to be electrically connected to the distribution chamber 6.

The second mold 2 disposed between the first mold 1 and the third mold 3 has a cavity formed at the end face on the side of the first mold 1 and is opened at the time of mold clamping. The distribution chamber 6 is formed in cooperation with the mold 1. Further, the second mold 2 has a plurality of injection holes 7 for connecting the flow chamber 6 and the cavity 9 of the third mold 3, and when the mold is clamped, the flow holes of the first mold 1 are made. 5 is electrically connected to the cavity 9 of the third mold 3 through the flow chamber 6 of the second mold 2 and the injection hole 7.

A hole 8 is formed in the central portion of the second mold 2 so as to penetrate the central portion, and the pin 4 is inserted into the hole 8 so as to be retractable. The pin 4 has a disc-shaped push-up portion 11 having a size that cannot be inserted into the hole 8 of the second mold 2 formed at the upper end portion, and in the normal state, the push-up portion 11 is provided in the flow chamber 6. It is located and is in contact with the bottom surface of the flow chamber 6. When the mold is clamped, a gap is formed between the push-up portion 11 and the bottom surface of the first mold 1, and a flow path for circulating the elastic material is formed. It

The third mold 3 has a cavity 9 formed in a ring shape for molding a product therein, and the second mold 2 is brought into contact with the upper end surface of the third mold 3 so that the cavity 9 becomes a first mold. It is designed to be partitioned by the bottom surface of the 2 type 2.

Further, a through hole 10 is bored in the inside of the third mold 3 in the axial direction, so that the metal ring 25a can be engaged with the peripheral portion of the upper end opening of the through hole 10. I have to. At this time, the engaging portion of the metal ring 25a in the third mold 3 is such that the one end of the metal ring 25a can be positioned inside the cavity 9 when the metal ring 25a is arranged. And the through hole 10 communicate with each other.

When the third die 3 is clamped, a part of the second die 2 is fitted in the through hole 10 and the lower portion of the pin 4 is located further inside. There is. Further, at the time of this mold clamping, the metal ring 25a arranged at the opening of the through hole 10 is sandwiched and held by the third mold 3 and the second mold 2.

As shown in FIG. 1, the distribution board 13 that presses the first mold 1, the second mold 2, and the third mold 3 when they are clamped has an injection pot 16 that opens upward. At the same time as it is formed, an injection nozzle 14 is formed inside, and this injection nozzle 14 conducts the inner space of the injection port 16 to the lower surface side of the distribution board 13.

Further, the distribution board 13 is fixed to the main body of the pressing apparatus, and when the molding die is pressed on the hot platen 24, the injection nozzle 14 is electrically connected to the flow hole 5 of the first die 1. It is supposed to do.

The piston 15 is inserted into the pouring pot 16 of the distribution board 13 from above. After the unvulcanized elastic material is placed on the pouring pot 16, the piston 15 is used. By applying pressure to the elastic material, the elastic material is injected into the mold through the injection nozzle 14.

A stop ring 12 is formed in the lower part of the pin 4 with a size that cannot be inserted into the hole 8 of the second mold 2. When the pin 4 is pushed up in the axial direction, By locking the stop ring 12 around the opening of the hole 8, the pin 4 is prevented from further projecting.

Next, the operation of the above will be described. First, the metal ring 25a is arranged at the upper end opening of the through hole 10 of the third mold 3, and then the second mold 2 is interposed between the third mold 1 and the first mold 1 so that heat is sequentially applied. The third die 3, the second die 2, and the first die 1 are brought into contact with the board 24 from below to perform die clamping, so that the metal ring 25a is sandwiched between the second die 2 and the third die 3. A channel for holding the elastic material to the cavity 9 is formed in the mold while being held.

Next, after placing an unvulcanized elastic material in the injection pot 16 of the distribution board 13 which is a press device component, the piston 15 is pressed to apply pressure to the elastic material in the injection pot 16. By applying the elastic material, the elastic material is injected into the mold through the injection nozzle 14.

The elastic material injected from the injection nozzle 14 flows into the flow chamber 6 of the second mold 2 through the flow hole 5 of the first mold 1, and further into the cavity of the third mold 3 via the injection hole 7. The elastic material is introduced into the cavity 9 and filled in the cavity 9.

At this time, since the flow hole 5 of the first mold 1 is formed in the central portion of the first mold 1, when the elastic material flows through the flow hole 5 into the flow chamber 6 of the second mold 2, The elastic material circulates so as to spread outward from the central portion. Therefore, the elastic material flowing in the flow chamber 6 of the second mold 2 is guided to the injection hole 7 in a well-balanced manner, so that the cavity 9 can be filled smoothly and surely.

After that, the elastic material is vulcanized and molded, so that the elastic material filled in the cavity 9 is integrated with the metal ring 25b to be molded as a product.

After a predetermined time has elapsed after the mold is clamped, the mold is opened as shown in FIG. At this time, a burr 26 formed by the flow chamber 6 and the injection hole 7 of the first mold 1 and the flow hole 5 of the first mold 1 is attached to the second mold 2, and the elastic body is attached to the third mold 3. The product 25 in which 25b is integrated with the metal ring 25a is attached.

The first die 1, the second die 2, and the third die 3, which are forming dies, can contact and separate from each other, and these forming dies are separated from the press device and the heating plate 24. Since it is possible, the second mold 2 with the burrs 26 adheres to the removing process of the burrs 26 (Fig. 4), and the third mold 3 with the products 25 adheres to the removing process of the products 25 (Fig. 4). It will be moved to 5) respectively.

FIG. 4 shows a burr removal process of the second mold 2. In the burr removal step shown in FIG. 4, the protruding pin 28 is adapted to push the pin 4 upward in the axial direction, whereby the protruding portion 11 of the pin 4 adheres to the second mold 2. 26 is pushed up to remove the burr 26 from the second mold 2.

The burr 26 pushed up by the pin 4 is adsorbed and removed by the air chuck 27a shown in FIG. 4, for example.

FIG. 5 shows a product removing process of the third mold 3. In the product take-out step shown in FIG. 5, the product projecting pin 29 is inserted from below the through hole 10 of the third mold 3, and the metal ring 25a is formed on the outer peripheral edge of the upper end of the product projecting pin 29. By engaging and pushing up the lower end portion, the product 25 is separated from the third mold 3 in a state where the metal ring 25a and the elastic body 25b are integrated.

Then, the product 25 projected by the product projecting pin 29 is sucked and taken out by the air chuck 27b shown in FIG. 5, for example.

[0050]

[Effect of the device]

 As described above, according to the present invention, the burr that adheres to the second mold when the mold is opened after molding can be easily removed by pushing up with a pin. The removal work can be mechanically removed by an air chuck, etc. Therefore, it is possible to automate the entire process.

With such automation of the process, there is an effect that it is possible to reduce the defects of the product and to improve the stability of the quality, and to improve the productivity.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a view showing a main part of a molding die according to the present invention.

FIG. 3 is a view showing a state in which the mold according to the present invention is opened.

FIG. 4 is a diagram showing a step of removing burrs attached to a second mold.

FIG. 5 is a diagram showing a process of taking out a product molded into a third mold.

FIG. 6 is a diagram showing a conventional example.

FIG. 7 is a view showing a state where a conventional molding die is opened.

FIG. 8 is a diagram showing a step of removing burrs adhering to a first die in a conventional molding die.

FIG. 9 is a view showing a step of taking out a product molded into a third mold in a conventional molding die.

FIG. 10 is a diagram showing a product.

[Explanation of symbols]

 1, 41 ………… 1st type 2, 42 ………… 2nd type 3, 43 ………… 3rd type 4 ………… Pin 5 ………… Distribution hole 6 ………… Distribution room 7, 47 ………… Injection hole 8 ………… Hole 9, 49 ………… Cavity 10, 50 ………… Through hole 11 ………… Push up part 12 ………… Stop ring 13 …… Distributor 14 …… Injection nozzle 15,55 ………… Piston 16,56 ………… Injection pot 21 ………… First mold plate 22 ………… Second mold plate 23 ………… … 3rd type plate 24 ………… Heat plate 25, 65 ………… Product 25a, 65a ………… Metal ring 25b, 65b ………… Elastic body 26, 66 ………… Burrs 27a, 27b… … Chuck 28 ………… Projection pin 29, 69 ………… Product projection pin

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area B29K 105: 24

Claims (3)

[Scope of utility model registration request] 1. A first mold (1), a second mold (2), and a third mold (3) which can be brought into contact with each other and separated from each other, and when the mold is clamped, the second mold (2) is A molding die positioned between the first die (1) and the third die (3), the first die (1) having a flow hole (5), and the first die ( A flow chamber (6) is formed in cooperation with the flow hole (5) in cooperation with the flow chamber (1), and a pin (4) is movably provided in the flow chamber (6). The mold (2) comprises a second mold (2) and a third mold (3) having a cavity (9) communicating with the flow chamber (6) of the second mold (2). ) Projecting pin (28)
Mold that is moved by. 2. The pin (4) has a push-up portion (11) formed at an end thereof, and the push-up portion (11) is
The molding die according to claim 1, wherein a burr (26) formed in the flow chamber (6) of the second die (2) is peeled off during molding. 3. The molding die according to claim 1, wherein the flow hole (5) of the first die (1) is formed in a central portion.