JPH072017U - Mold - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a molding die that facilitates mounting of integrally molded metal fittings and that has a good mold release property. [Structure] The upper mold 1, the middle mold 2, and the lower mold 3 form a cavity 6. The upper die 1 has a recess 4 and an insertion hole 4 communicating with the recess 4.
a is formed. The magnet 7 is vertically movably inserted through the insertion hole 4a. The magnet 7 is fixed to a fixed plate 9 which can be brought into and out of contact with the upper mold 1. The fixed plate 9 is urged downward by the first spring 11 and can be brought into contact with and separated from the push-up pin 10 urged upward by the second spring 12. When the mold 7 is clamped, the fixed plate 9 is pushed up by the push-up pin 10 and is set in the recess 4. When the mold is opened, the push-up pin 10 fixes the fixed plate 9
The magnet 7 projects from the recess 4 by the urging force of the first spring 11.

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 molded product having a predetermined shape by integrally molding a cloth made of a rubber-like elastic material with a metal fitting.

[0002]

[Prior art and its problems]

 Conventionally, a molding die as shown in FIG. 5 has been used for molding a molded product as shown in FIG. 4, for example. That is, the mold shown in FIG. 5 includes an upper mold 21 and a lower mold 23 that cooperate to form a cavity 26, and a first metal fitting 36 and a second metal fitting 37 that are integrally molded are arranged in the cavity 26. After that, the cloth 38a is placed between the metal fittings 36 and 37 to perform mold clamping. The upper die 21 is formed with a step 25 and a hole 28 for receiving the second metal fitting 37. The upper die 21 holds and adsorbs the second metal fitting 37 in the step 25 and the hole 28. The magnet 27 is provided. The lower mold 23 is formed with a recess 24 having a size capable of accommodating the first metal fitting 36.

In FIG. 5, the upper mold 21 and the lower mold 23 can come into contact with and separate from each other. A cavity 26 is formed between the three. In addition, the first metal fitting 36 and the second metal fitting 37, which are integrally formed, are arranged at predetermined positions in the cavity 26.

A step 25 and a hole 28 for receiving the second metal fitting 37 are formed in the upper mold 21. Here, as the second metal fitting 37, one in which a disk-shaped washer part 37a and a bolt part 37b projecting to the center part of one end face of this washer part 37a are integrally formed is used. For this reason, the step portion 25 is formed in a circular shape on the lower end surface of the upper mold 21 so as to receive the washer portion 37a of the second metal fitting 37, so that the end surface of the washer portion 37a can be locked. . Further, the hole 28 is formed in the central portion of the step portion 25, and the bolt portion 37b of the second metal fitting 37 can be inserted therein.

A magnet 27 is arranged inside the upper die 21. The magnet 27 is arranged so as to close the hole 28. When the bolt portion 37b of the second metal fitting 37 is inserted into the hole 28, the bolt portion 37b comes into contact with or comes close to the magnet 27. I am doing it. As a result, the second metal fitting 37 is held in a state of being positioned at a predetermined position of the upper die 21 because the bolt portion 37b inserted into the hole 28 is attracted to the magnet 27.

In the lower mold 23, a recess 24 is formed at a position corresponding to the step 25 and the hole 28 of the upper mold 21 and has a size capable of accommodating the first metal fitting 36 and opening upward. Here, as the first metal fitting 36, a nut having a female screw portion 36a that does not penetrate is used. The first metal fitting 36 is housed in the recess 24 with the opening of the female screw portion 36a in contact with the bottom surface of the recess 24 of the lower mold 23.

Then, by combining and matching the upper mold 21 and the lower mold 23, the cavity 26 is formed by the recess 24 of the lower mold 23 and the step 25 and the hole 28 of the upper mold 21. There is. At this time, the opening of the recess 24 of the lower mold 23 is closed by the washer portion 37a of the second metal fitting 37, and the recess 24 and the washer portion 37a are placed in a closed space. The dough 38a is filled.

This forming die is configured as described above, so that the first metal fitting 36 and the second metal fitting 37 are arranged at predetermined positions in the cavity 26, and then the cloth 38a is placed and then the mold clamping is performed. Then, the first metal fitting 36 and the second metal fitting 37 are formed integrally with the rubber-like elastic body (rubber part 38).

First, the first metal fitting 36 is placed in the recess 24 of the lower mold 23 with the female screw portion 36 a facing downward. The second metal fitting 37 is arranged in the upper die 21 with the bolt portion 37b inserted into the hole 28 thereof and with the washer portion 37a abutting and locked to the step portion 25. Then, by placing the cloth 38a on the portion corresponding to the recess 24 of the lower mold 23, and by combining the upper mold 21 and the lower mold 23, the cloth 38a is divided into the first metal fitting 36 and the second metal fitting 37. It is placed in between and the mold is clamped by a press machine (not shown).

Then, the dough 38a is deformed by the pressure of the upper mold 21 and the lower mold 23 due to the mold clamping force, and the dough 38a is filled in the recess 24 of the upper mold 21. The cloth 38a is filled between the first metal fitting 36 and the second metal fitting 37. Then, the dough 38a is vulcanized in the cavity 26 in that state, whereby the dough 38a is molded integrally with the first metal fitting 36 and the second metal fitting 37. As a result, a molded product is obtained with the rubber portion 38 interposed between the first metal fitting 36 and the second metal fitting 37 as shown in FIG.

However, in such a conventional molding die, there is a possibility that a so-called dough around the second metal fitting 37 may occur.

That is, since the step portion 25 that receives the second metal fitting 37 is formed to be relatively large, when the upper die 21 and the lower die 23 are combined, the inner peripheral side surface of the step portion 25 and the washer are A gap is formed between the outer peripheral side surface of the portion 37a and the cloth 38a may wrap around this gap during mold clamping.

That is, since the step portion 25 of the upper die 21 is formed with a larger area than the end surface of the washer portion 37a of the second metal fitting 37, the inner peripheral side surface of the step portion 25 and the washer portion 37a are formed. An annular gap is formed between the outer peripheral side surface. Further, when the mold is clamped, the second metal fitting 37 closes the recess 24 of the lower mold 23 to seal it. However, during the mold clamping, the washer portion 37a of the second metal fitting 37 is recessed. The place 24 is not completely closed. Therefore, at the time of mold clamping, the cloth 38a travels through the gap between the end surface of the washer portion 37a of the second metal fitting 37 and the peripheral edge portion of the opening of the recess 24, and the outer peripheral side surface of the washer portion 37a and the step portion. The material will leak into the gap between the inner peripheral side surface of 25 and the so-called dough area.

As a result, a molded product is obtained with the rubber-like elastic body attached to the outer peripheral side surface of the washer portion 37a of the second metal fitting 37, and there is a problem that the work of removing the attached rubber takes time and effort. It was

Therefore, in order to prevent the material around the washer portion 37a of the second metal fitting 37, as shown in FIG. 6, a forming die having a so-called three-piece split structure has been devised. . That is, the mold shown in FIG. 6 includes an upper mold 41, a middle mold 42, and a lower mold 43 that cooperate to form a cavity 46, and the cavity 46 is integrally molded with the first metal fitting 56 and the second metal fitting. After mounting and arranging 57, the material is filled between both metal fittings 56 and 57 to perform mold clamping. A recess 44 having a size capable of accommodating the first metal fitting 56 is formed in the upper mold 41, and a magnet 47 for attracting and holding the first metal fitting 56 accommodated in the recess 44 is held in the upper mold 41. To arrange. The middle die 42 is formed with a step portion 45 for receiving the second metal fitting 57 in an abutting state.

In FIG. 6, the upper mold 41, the middle mold 42, and the lower mold 43 can be brought into contact with each other and separated from each other. A cavity 46 is formed between 41, 42 and 43. Then, the first metal fitting 56 and the second metal fitting 57, which are integrally molded, are mounted and arranged in predetermined positions in the cavity 46.

The upper mold 41 is formed with a recess 44 having a size capable of accommodating the first metal fitting 56 and opening downward. Here, as the first metal fitting 56, a nut having a female screw portion 56a that does not penetrate is used. The first metal fitting 56 is housed in the recess 44 with the opening of the female screw portion 56a in contact with the bottom surface of the recess 44 of the upper die 41.

A magnet 47 is arranged inside the upper mold 41. The magnet 47 is arranged with its one magnetic pole side end face aligned with the bottom face at the center of the bottom of the recess 44. As a result, when the first metal fitting 56 is housed in the recess 44, the first metal fitting 56 is mounted and held with the end surface of the female screw portion 56a on the opening side being attracted to the magnet 47. Become.

A hole 48 for holding the second metal fitting 57 is formed in the lower mold 43 at a portion corresponding to the recess 44 of the upper mold 41. Here, the second metal fitting 57 is formed by integrally forming a disk-shaped washer part 57a and a bolt part 57b protruding to the center of one end face of the washer part 57a. At this time, the hole 48 of the lower mold 43 is formed in such a size that the bolt portion 57b of the second metal fitting 57 can be inserted and the washer portion 57a cannot be inserted. Then, by inserting the bolt portion 57b into this hole 48, the second metal fitting 57 is held in a state where the washer portion 57a abuts against and engages with the peripheral portion of the opening of the hole 48 and is positioned at a predetermined position. Will be done.

The middle die 42 has a hole 42a at a portion corresponding to the recess 44 of the upper die 41, and a step portion 45 for receiving the washer portion 57a of the second metal fitting 57 is formed at a lower opening portion of the hole 42a. There is. The molds are closed by combining and matching the respective molds 41, 42, 43 so that the middle mold 42 is interposed between the upper mold 41 and the lower mold 43. At this time, the recess of the upper mold 41 is formed. The cavity 46 is formed by the hole 44 a of the middle mold 42 and the hole 48 of the lower mold 43.

Further, since the step portion 45 of the middle die 42 is formed in an annular shape so as to receive the washer portion 57a of the second metal fitting 57, the peripheral edge portion of the washer portion 57a can be contacted and locked. There is. Then, the second metal fitting 57 is inserted into the hole 48 of the lower mold 43 for positioning, and then the middle mold 42 is fitted to the lower mold 43, whereby the washer portion 57a of the second metal fitting 57 is fitted. Comes into contact with the step portion 45 of the middle die 42. Therefore, when the mold is closed, the lower opening of the hole 42a of the middle mold 42 is closed by the washer part 57a of the second metal fitting 57, whereby the recess 44 of the upper mold 41 and the hole 42a of the middle mold 42 are formed. The empty space is sealed.

This molding die is configured as described above, so that the first metal fitting 56 and the second metal fitting 57 are mounted and arranged at a predetermined position in the cavity 46, and then the first metal fitting is placed in the cavity 46. When the cloth is filled in the space formed by the metal fittings 56 and the second metal fittings 57 and the mold is clamped, the first metal fittings 56 and the second metal fittings 57 are molded integrally with the rubber-like elastic body. It is like this.

First, the bolt portion 57b of the second metal fitting 57 is inserted into the hole 48 of the lower mold 43, whereby the second metal fitting 57 is arranged at a predetermined position. Further, the first metal fitting 56 is accommodated in the recess 44 of the upper mold 41 with the female screw portion 56a facing upward, whereby the first metal fitting 56 is mounted and arranged at a predetermined position.

In this case, the recesses 44 of the upper die 41 are formed at a plurality of locations, and it is necessary to dispose the first metal fittings 56 in the respective recesses 44. Therefore, in order to mount and arrange the first metal fitting 56 on the upper mold 41, an aligning jig 59 as shown in FIG. 7 is used. The alignment jig 59 has a disk shape, and a through hole 59a is formed at a position corresponding to each recess 44 of the upper die 41, and a taper that expands upward is formed in an upper opening of the through hole 59a. The surface is formed.

In order to align the plurality of first metal fittings 56 using the aligning jig 59, first, a large number of first metal fittings 56 are placed on the upper surface of the aligning jig 59 in a diffused state, In that state, vibration is applied by a vibrator. As a result, the first metal fitting 56 moves on the upper surface of the aligning jig 59 and is inverted at the portion of the through hole 59a or falls as it is, so that the first threaded portion 56a is positioned in each through hole 59a with the female screw portion 56a facing upward. Be touched. In this case, a flange portion is formed on the opening side of the female screw portion 56a of the first metal fitting 56 so as to project outward, and this flange portion is locked to the tapered surface of the through hole 59a. It has become.

At this time, in order to properly align the first metal fitting 56, the inner diameter of the upper opening of the through hole 59 a of the alignment jig 59 is made larger than the outer diameter of the flange portion of the first metal fitting 56. A gap g is formed. Further, the inner diameter of the through hole 59a of the alignment jig 59 is formed larger than the outer diameter of the first metal fitting 56 so that the gap h is formed.

Then, the first metal fittings 56 are aligned in the respective through holes 59 a of the alignment jig 59, and then the alignment jig 59 is attached to the upper mold 41 so that the first metal fittings 56 correspond to the recesses 44. Place on the bottom edge. As a result, the first metal fitting 56 is attracted to the magnet 47 provided on the upper die 41, so that the first metal fitting 56 is mounted and arranged in the recess 44 with the female screw portion 56a facing upward. .

On the other hand, the middle mold 42 is fitted on the lower mold 43. At this time, in the second metal fitting 57 arranged at the predetermined position of the lower die 43, the peripheral edge of the washer portion 57a is sandwiched between the middle die 42 and the lower die 43, whereby the washer portion 57a is held in the middle die 42. By contacting the step portion 45, the lower opening of the hole 42a of the middle die 42 is closed.

Next, the upper mold 41 is fitted on the middle mold 42 and the mold is closed. At this time, a void is formed between the first metal fitting 56 held by the upper mold 41 and the second metal fitting 57 held by the lower mold 43. The mold is closed by a press machine (not shown). Then, the material is molded integrally with the first metal fitting 56 and the second metal fitting 57. As a result, a molded product can be obtained with the rubber-like elastic body interposed between the first metal fitting 56 and the second metal fitting 57.

In this case, when the mold is closed, the second metal fitting 57 is formed between the first metal fitting 56 and the second metal fitting 57 by abutting the peripheral edge of the second metal fitting 57 on the step portion 45 of the middle mold 42. Since the vacant space is hermetically sealed, when the cloth is filled, so-called cloth rotation does not occur on the outer peripheral side surface of the washer portion 57a of the second metal fitting 57.

However, in such a conventional molding die, the first metal fitting 56 may not be properly mounted on the upper die 41.

That is, since the alignment jig 59 for aligning the first metal fitting 56 has a large gap g, h between the through hole 59 a and the first metal fitting 56, the alignment state of the first metal fitting 56 is large. Was not very accurate.

That is, when the gaps g and h between the through hole 59 a of the alignment jig 59 and the first metal fitting 56 are increased, the alignment jig 59 is attached to the upper mold so that the first metal fitting 56 is attracted to the magnet 47. When arranged on the lower end surface of 41, the axis line between the recess 44 of the upper die 41 and the first metal fitting 56 may be displaced (displacement i in FIG. 8). Therefore, as shown in FIG. 8, even if the first metal fitting 56 on the aligning jig 59 is made to correspond to the recess 44 of the upper die 41, the flange portion of the first metal fitting 56 is located in the recess 44 of the upper die 41. The first metal fitting 56 could not be mounted / placed in the recess 44 due to being caught on the peripheral edge of the opening.

Therefore, in order to facilitate mounting and placement of the first metal fitting 56 on the upper mold 41, as shown in FIG. 9, the mold splitting surface f in FIG. 6 is changed to the position j. It is conceivable that the recess 44 of the mold 41 is eliminated and the first metal fitting 56 is directly attracted to the magnet 47, and the hole 42a of the middle mold 42 is lengthened by the depth of the recess 44 of the upper mold 41. ing.

However, in the molding die shown in FIG. 9, the first metal fitting 56 may fall into the hole 42 a of the middle die 42 when filling the dough.

That is, when the dough is injected between the first metal fitting 56 and the second metal fitting 57, the flow of this material directly hits the first metal fitting 56. The one metal member 56 may be separated from the magnet 47 and fall into the hole 42a of the middle mold 42, resulting in defective molding.

Further, in the molding die shown in FIG. 6 and FIG. 9, since the dough is filled in the hole 42a of the middle mold 42 for molding, the dough does not have the upper mold 41 or the middle mold at the time of vulcanization. Therefore, it was difficult to release the molded product. Further, since the cloth adheres between the upper mold 41 and the middle mold 42, the upper mold 41 and the middle mold 42 may come into close contact with each other, and the mold opening may not be smooth. Therefore, due to the above problems, the molding dies shown in FIGS. 6, 8 and 9 are not practical and have not been commercialized at present.

An object of the present invention is to solve the above problems and to provide a molding die that can easily mount a metal fitting that is integrally molded to a die and can easily release a molded product. And

[0039]

[Means for solving problems]

 In order to solve the above-mentioned problems, the present invention comprises an upper mold, a middle mold, and a lower mold which cooperate to form a cavity, and after mounting and disposing a metal fitting integrally molded in the cavity, a material is formed in the cavity. A molding die for filling and molding, wherein the upper mold has a recess having a size capable of accommodating the metal fitting, and a downward opening, and an insertion hole penetrating vertically and communicating with the recess. A hole and a magnet that is capable of adsorbing the metal fitting, is disposed in a state of being inserted into the insertion hole, and is movable between the operating position and the non-operating position by the urging force of the urging member are provided. The magnet has a structure in which the metal fitting attracted to the tip at the operating position is guided into the recess at the non-operating position.

[0040]

[Action]

 By adopting the above means, the present invention can improve the mountability of the integrally molded metal fitting to the upper mold. That is, the magnet, which is biased by the biasing member and is movable between the actuated position and the non-actuated position, is in a state of protruding from the recess in the actuated position in the normal state. . For this reason, when mounting the metal fitting, by arranging the metal fitting on the lower end surface of the upper die, the magnetic force of the magnet can be effectively exerted to facilitate the attraction of the metal fitting. Also, when the mold is clamped, the magnet that attracts the metal fitting is retracted into the recess to the inoperative position, so that the metal fitting is housed in the recess, improving the mountability of the metal fitting to the upper mold. You can do it.

When the magnet moves from the inoperative position to the operating position, the tip of the magnet is caused to project from the recess by the urging force of the urging member. Since the metal fitting is attached to the magnet and is projected from the recess, it is easy to take out and the releasability is improved. In addition, in this case, since the molded product is projected from the recess by the projecting operation of the magnet, at the same time, it acts so as to separate the upper mold from the abutting mold, which facilitates the mold opening work. You can do it.

[0042]

【Example】

 Embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a diagram showing an embodiment of a molding die according to the present invention. That is, the mold shown in FIG. 1 includes an upper mold 1, a middle mold 2, and a lower mold 3 that cooperate to form a cavity 6, and the cavity 6 is integrally molded with the first metal fitting 16 and the second metal fitting 16. After mounting and arranging 17, the material is filled between the metal fittings 16 and 17 and the mold is clamped. The upper mold 1 has a recess 4 having a size capable of accommodating the first metal fitting 16 and opening downward, an insertion hole 4a penetrating in the vertical direction and communicating with the recess 4, and a first spring 11 Also, a magnet 7 is provided which is biased by the second spring 12 and is vertically movably inserted into the insertion hole 4a. The magnet 7 attracts and holds the first metal fitting 16 housed in the recess 4. The middle mold 2 is formed with a step portion 5 for receiving the second metal fitting 17 in a contact state.

In FIG. 1, the upper mold 1, the middle mold 2, and the lower mold 3 can be brought into contact with each other and separated from each other. A cavity 6 is formed between 1, 2, 3. Then, the first metal fitting 16 and the second metal fitting 17 which are integrally molded are mounted and arranged at predetermined positions in the cavity 6.

The upper mold 1 is formed with a plurality of recesses 4 each having a size capable of accommodating the first metal fitting 16 and opening downward. Here, the first fitting 16 has a female screw portion 16a that does not penetrate, and a nut having a flange portion that projects outward is used on the opening side of the female screw portion 16a. The first metal fitting 16 can be accommodated in the recess 4 with the opening of the female thread 16a being in contact with the bottom surface of the recess 4 of the upper mold 1.

The upper mold 1 is formed with an insertion hole 4a penetrating the center portion of the bottom surface of each recess 4 so that each recess 4 is opened upward. A cylindrical magnet 7 is inserted into each of the insertion holes 4a in a vertically movable state. In this case, as shown in FIG. 2, a gap b is formed between the outer peripheral surface of the magnet 7 and the inner peripheral surface of the insertion hole 4a.

The magnet 7 has a pointed convex portion 7 a formed at the center of the end face on the magnetic pole side below the magnet 7. The convex portion 7a has a size such that it can be inserted into the female screw portion 16a of the first metal fitting 16, and a gap is formed between the inner peripheral surface of the female screw portion 16a and the outer peripheral surface of the convex portion 7a. a is formed. The height of the convex portion 7a is smaller than the depth of the female screw portion 16a, and when the convex portion 7a is inserted into the female screw portion 16a, the end surface of the first metal fitting 16 on the side of the opening of the female screw portion 16a. Of the magnet 7 is in contact with the annular lower end surface 7 b of the magnet 7.

Then, when the female threaded portion 16a of the first metal fitting 16 is inserted into the convex portion 7a of the magnet 7, the first metal fitting 16 is moved by the action of the magnetic force with the opening of the female metal threaded portion 16a facing upward. It is attracted to the magnet 7 and held in that state.

In this case, the total of the clearance a and the clearance b is between the surface of the first metal fitting 16 having the maximum outer diameter (the flange portion) and the surface facing the inner peripheral surface of the recess 4 of the upper mold 1. It is set so as to be smaller than the distance c, so that the first metal fitting 16 can be inserted and mounted in the recess 4.

The upper end of each magnet 7 is fixed to a fixed plate 9 which is disposed on the upper surface of the upper mold 1 so as to be able to come into contact with and separate from the upper plate 1. In addition, above the upper mold 1, a pressing member 13 is integrally attached to the upper mold 1 while being separated from the fixed plate 9 by a predetermined distance e. Then, the first spring 11, which is an urging member, is disposed between the pressing member 13 and the fixed plate 9.

The first spring 11 is a so-called compression coil spring, which biases the fixed plate 9 downward, and the biasing force causes the fixed plate 9 to move to the upper end surface of the upper mold 1 in the normal state. The contact is made. As shown in FIG. 2 when the magnet 7 is in the operating position, at this time, in the operating position, the magnet 7 fixed to the fixed plate 9 has an annular lower end surface 7b whose lower end surface is lower. It is designed to project downward by a slight amount d.

A hole 8 1 for holding the second metal fitting 17 is formed in the lower mold 3 at a portion corresponding to the recess 4 of the upper mold 1. Here, the second metal fitting 17 is formed by integrally forming a disk-shaped washer portion 17a and a bolt portion 17b protruding to the center of one end face of the washer portion 17a. At this time, the hole 8 of the lower mold 3 is formed in such a size that the bolt portion 17b of the second metal fitting 17 can be inserted and the washer portion 17a cannot be inserted. Then, by inserting the bolt portion 17b into the hole 8, the washer portion 17a is held in the state in which the washer portion 17a is brought into contact with and locked to the peripheral portion of the opening of the hole 8 and positioned at a predetermined position. The Rukoto.

The middle die 2 has a hole 2a at a portion corresponding to the recess 4 of the upper die 1, and a step portion 5 for receiving the washer portion 17a of the second metal fitting 17 is formed at a lower opening portion of the hole 2a. is there. Then, the molds are closed by combining the molds 1, 2, 3 so that the middle mold 2 is interposed between the upper mold 1 and the lower mold 3, and at this time, the recess of the upper mold 1 is formed. The cavity 6 is formed by the hole 4 of the middle mold 2 and the hole 8 of the lower mold 3.

Further, since the step portion 5 of the middle die 2 is formed in an annular shape so as to receive the washer portion 17a of the second metal fitting 17, the peripheral edge portion of the washer portion 17a can be contacted / locked. ing. The bolt 17b of the second metal fitting 17 is inserted into the hole 8 of the lower mold 3 for positioning, and then the middle mold 2 is fitted to the lower mold 3, whereby the washer portion 1 of the second metal fitting 17 is inserted. 7a comes into contact with the step portion 5 of the middle mold 2. Therefore, when the mold is closed, the lower opening of the hole 2a of the middle mold 2 is closed by the washer portion 17a of the second metal fitting 17, whereby the recess 4 of the upper mold 1 and the hole 2a of the middle mold 2 are formed. The place is sealed.

The lower die 3 is provided with a push-up pin 10 that can come in contact with and separate from the fixed plate 9. The push-up pin 10 is provided outside the mold via a second spring 12 which is a biasing member having a stronger biasing force than the first spring 11. The second spring 12 is a so-called compression coil spring, the lower end of which is attached to the lower die 3 and the upper end of which is fixed to the push-up pin 10, whereby the push-up pin 10 is It is biased upward by the biasing force of the second spring 12. At this time, a part of the fixed plate 9 is formed so as to extend to the outside of the molding die, and the upper end portion of the push-up pin 10 can be engaged with this extended portion.

Therefore, the fixed plate 9 can be moved up and down within the range of the distance e between the fixed plate 9 and the pressing member 13 by being biased by the first spring 11 and the second spring 12. There is. As a result, the magnet 7 fixed to the fixed plate 9 appears and disappears from the insertion hole 4a according to the vertical movement of the fixed plate 9, and the convex portion 7a is located between the opening and the bottom of the recess 4 of the upper mold 1. It is possible to move back and forth. In this case, the magnet 7 is set at the upper limit point (inoperative position) so that the annular lower end surface 7b does not move above the bottom surface of the recess 4. Therefore, the magnet 7 can move between the operating position and the non-operating position.

As shown in FIG. 3, in the above-mentioned forming die, the upper die 1 is fixed to the fixed platen 14, and the lower die 3 is fixed to the press platen 15 of the press machine which can be raised and lowered. Then, the press platen 15 is raised while the middle mold 2 is fitted to the lower mold 3, whereby the molds 1, 2, 3 are clamped. Therefore, when the press platen 15 rises, the push-up pin 10 pushes up the fixed plate 9 by the biasing force of the second spring 12, and when the press platen 15 descends, the push-up pin 10 is fixed plate. While being separated from the upper mold 1, the fixing plate 9 contacts the upper end surface of the upper mold 1 by the urging force of the first spring 11.

Next, the operation of the above will be described. With this molding die configured as described above, the first metal fitting 16 and the second metal fitting 17 are mounted and arranged at predetermined positions in the cavity 6, and then the first metal fitting 16 and the second metal fitting 16 are placed in the cavity 6. When the space is filled with the metal fitting 17 and the cloth is clamped, the first metal fitting 16 and the second metal fitting 17 are molded integrally with the rubber-like elastic body. As a result, a molded product similar to that shown in FIG. 4 can be obtained.

First, the bolt portion 17b of the second metal fitting 17 is inserted into the hole 8 of the lower mold 3, whereby the second metal fitting 17 is arranged at a predetermined position. Further, the first metal fitting 16 is accommodated in the recess 4 of the upper mold 1 with the female screw portion 16a facing upward, whereby the first metal fitting 16 is mounted and arranged at a predetermined position.

In this case, since it is necessary to dispose the first metal fittings 16 in the respective recesses 4 of the upper mold 1, in order to mount and dispose the first metal fittings 16 on the upper mold 1, it is shown in FIG. Such an alignment jig 59 is used. The aligning jig 59 has a disk shape, and through holes 59a are formed at positions corresponding to the respective recesses 4 of the upper die 1, and a tapered surface that expands upward in the upper opening of the through hole 59a. Are formed.

In order to align the plurality of first metal fittings 16 using the alignment jig 59, first, a large number of first metal fittings 16 are placed on the upper surface of the alignment jig 59 in a diffused state, In that state, vibration is applied by a vibrator. As a result, the first metal fitting 16 moves on the upper surface of the aligning jig 59 and is inverted at the portion of the through hole 59a or falls as it is, so that the first thread 16 is positioned in each through hole 59a with the female screw portion 16a facing upward. The flange portion of the first metal fitting 16 is adapted to engage with the tapered surface of the through hole 59a.

Then, the first metal fittings 16 are aligned in the respective through holes 59 a of the alignment jig 59, and then the alignment jig 59 is moved so that the first metal fittings 16 correspond to the recesses 4. Place on the bottom edge of. As a result, the first metal fitting 16 is attracted to the magnet 7 provided on the upper mold 1, whereby the female threaded portion 16a is held in a state of facing upward.

At this time, in a normal state, the fixed plate 9 is in contact with the upper end surface of the upper mold 1 by the urging force of the first spring 11, so that the fixed plate 9 is fixed to the fixed plate 9. The magnet 7 is in a state (operating position) in which the convex portion 7 a thereof projects downward from the lower end surface of the upper mold 1. Therefore, when the first metal fitting 16 is attracted to the magnet 7, the convex portion 7a of the magnet 7 is inserted into the female screw portion 16a, so that the first metal fitting 16 is brought into a predetermined state by the convex portion 7a. It will be positioned.

On the other hand, the middle mold 2 is fitted on the lower mold 3. At this time, the second metal fitting 17 arranged at the predetermined position of the lower die 3 has its peripheral edge of the washer portion 17a sandwiched between the middle die 2 and the lower die 3, whereby the washer portion 17a of the middle die 2 is held. By contacting the step 5, the lower opening of the hole 2a of the middle mold 2 is closed.

Next, when the press platen 15 is raised, the middle mold part 2 combined with the lower mold part 3 and the upper mold part 1 fixed to the fixed platen 14 are fitted to each other and mold closing is performed, so that the push-up pin 10 moves to the first position. 2 The fixing plate 9 is pushed up by the urging force of the spring 12. For this reason, the fixed plate 9 moves upward against the biasing force of the first spring 11, and accordingly, the magnet 7 fixed to the fixed plate 9 and the first metal fitting 16 attracted thereto. As a result, the first metal fitting 16 completes the mounting on the upper mold 1 by moving up integrally and immersing into the recess 4 to the inoperative position.

At this time, a space is formed between the first metal fitting 16 mounted in the recess 4 of the upper mold 1 and the second metal fitting 17 held by the lower mold 3, and in this space. The dough is filled, and the mold is closed by the press board 15 in that state. Then, the cloth is integrally formed with the first metal fitting 16 and the second metal fitting 17. As a result, a molded product is obtained with the rubber-like elastic body interposed between the first metal fitting 16 and the second metal fitting 17.

After the molding, the press platen 15 is moved downward to open the mold. As the press platen 15 is moved downward, the upper mold 1 and the middle mold 2 are separated from each other, and the lower mold 3 is provided. The ejected push-up pin 10 is separated from the fixed plate 9. Then, the fixed plate 9 moves downward by the urging force of the first spring 11 and comes into contact with the upper end surface of the upper die 1. Along with this, the magnet 7 fixed to the fixed plate 9 moves downward to the operating position and projects from the recess 4, so that the molded product in which the first metal fitting 16 is integrally molded is the projection of the magnet 7. It is designed to be released from the recess 4 by the operation.

In the above case, when the mold is closed, the second metal fitting 17 contacts the peripheral portion of the second metal fitting 17 with the step portion 5 of the middle mold 2 to form an empty space formed between the first metal fitting 16 and the second metal fitting 17. Since the place is hermetically sealed, when the cloth is filled, so-called cloth rotation does not occur on the outer peripheral surface of the washer portion 17a of the second metal fitting 17.

In addition, in the above-mentioned forming die, the first metal fitting 16 can be suitably attached to the upper die 1.

That is, the magnet 7 for attracting the first metal fitting 16 is provided so as to be retractable from the recess 4 by the urging force of the first spring 11 and the second spring 12, and the lower end portion of the magnet 7 is However, by making it protrude downward below the lower end surface of the upper mold 1 when it is in the operating position in the normal state, the first metal fitting 16 can be attracted easily and accurately. Has become.

That is, since the lower end of the magnet 7 is made to project below the lower end surface of the upper mold 1 in the normal state, the first jig 16 is arranged in a predetermined state. When 59 is arranged below the upper mold 1 for mounting the first metal fitting 16 on the upper mold 1, the distance between the first metal fitting 16 and the magnet 7 can be reduced. For this reason, the magnet 7 can favorably exert its magnetic force on the first metal fitting 16, so that the first metal fitting 16 can be easily attracted.

At this time, since the convex portion 7 a for positioning the first metal fitting 16 is formed at the lower end portion of the magnet 7, when the first metal fitting 16 is attracted to the magnet 7, it is inevitable that The one metal fitting 16 is held in a predetermined state. As a result, when the magnetet 7 is retracted into the recess 4 when the mold is closed, the first metal fitting 16 can be smoothly accommodated in the recess 4 without being caught by the peripheral edge of the opening of the recess 4. It has become.

Further, in the above molding die, it is possible to easily release the molded product from the mold.

That is, by providing the first spring 11 and the second spring 12 and making the magnet 7 movable between the operating position and the non-operating position by the urging force of these, it is possible to project and retract from the recess 4. I am trying. As a result, when the mold is opened, the magnet 7 is projected from the recess 4 so that the molded product is projected downward by this projecting operation.

That is, at the time of mold clamping, the fixed plate 9 is pushed up by the push-up pin 10 that is biased by the biasing force of the second spring 12, and the magnet 7 is retracted into the recess 4 (inactive position). However, when the mold is opened, the fixing plate 9 is pushed down by the urging force of the first spring 11, so that the magnet 7 projects from the recess 4 (operating position).

Therefore, the molded product molded in the cavity 6 projects from the recess 4 in a state where the first metal fitting 16 is attracted to the magnet 7 by the magnet 7 projecting downward to the operating position when the mold is opened. Will be done. As a result, in the above-mentioned molding die, since the magnet 7 serves as a so-called ejector pin, the molded product is automatically released from the mold by opening the mold after molding.

Further, in this case, since the magnet 7 projects downward to the operating position when the mold is opened, the upper mold 1 and the middle mold 2 that are in contact with each other when the mold is clamped are separated from each other. Even if the cloth enters between the mold 1 and the middle mold 2 and the molds 1 and 2 come into close contact with each other, they are separated when the molds are opened.

As a result of the above, the so-called three-piece split mold structure of the upper mold 1, the middle mold 2, and the lower mold 3 prevents the material from rotating around the outer peripheral surface of the washer portion 17a of the second metal fitting 17 and performs good molding. The mold can be practically commercialized.

[0078]

[Effect of device]

 As described above, according to the present invention, the upper mold recess is provided with the magnet movable between the operating position and the non-operating position by the urging force of the urging member. It is designed to project from the recess when it is in the position, and to be retracted into the recess when it is in the inoperative position, so that the integrally molded metal fitting can be easily attracted to the magnet. The sucked metal fitting can be smoothly introduced into the recess and accommodated therein, and the fitting of the metal fitting to the upper mold can be facilitated.

In addition, when the mold is opened after molding, the magnet performs a protruding operation from the inoperative position to the operating position, so that the molded product is ejected from the recess with the metal fitting attracted to the magnet. Therefore, the releasability of the molded product can be improved. Further, in this case, since the magnet protrudes when the mold is opened, the upper mold and the mating mold (medium mold) that abuts on the magnet can be separated from each other, so that the mold can be properly opened. It will be possible.

[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 main part in FIG. 1, and is a view showing a state (solid line) in which a magnet is in an operating position.

FIG. 3 is a view showing a state in which a molding die is attached to a stationary platen and a press platen.

FIG. 4 is a view showing a molded product.

FIG. 5 is a diagram showing a conventional example.

FIG. 6 is a diagram showing another conventional example.

FIG. 7 is a diagram showing an alignment jig.

FIG. 8 is a diagram illustrating a conventional problem.

FIG. 9 is a diagram showing still another conventional example.

[Explanation of symbols]

 1, 21, 41 ... upper mold 2, 42 ... middle mold 2a, 8, 28, 42a, 48 ... hole 3, 23, 43 ... lower mold 4, 24, 44 ... recess 4a ... insertion hole 5, 25, 45 ... Step portion 6, 26, 46 ... Cavity 7, 27, 47 ... Magnet 7a ... Convex portion 7b ... Annular lower end surface 9 ... Fixed plate 10 ... Push-up pin 11, 12 ... ... Spring (biasing member) 13 ... Pressing member 14 ... Fixed plate 15 ... Press plate 16, 17, 36, 37, 56, 57 ... Metal fittings 16a, 36a, 56a ... Female screw part 17a, 37a, 57a …… Washer part 17b, 37b, 57b …… Bolt part 38 …… Rubber part 38a …… Material 59 …… Alignment jig 59a …… Through hole

Claims (1)

[Scope of utility model registration request] 1. A metal fitting (16, 17) comprising an upper mold (1), a middle mold (2) and a lower mold (3) which cooperate to form a cavity (6) and which is integrally molded in the cavity (6). ) Is mounted and arranged, and then the cavity (6) is filled with dough to be molded, and has a size capable of accommodating the metal fitting (16) in the upper mold (1). The recess (4) opening downward, the insertion hole (4a) penetrating in the vertical direction and communicating with the recess (4), and the fitting (16) can be adsorbed, and the insertion hole (4a ), And a magnet (7) movable between an operating position and a non-operating position by the urging force of the urging members (11, 12). Means that the metal fitting (16) adsorbed to the tip of the recess at the operating position, 4) A molding die characterized by being introduced into the inside.