CN117428970A

CN117428970A - Mold device and molded article

Info

Publication number: CN117428970A
Application number: CN202310453928.4A
Authority: CN
Inventors: 井上泰希; 植草贵行; 畠山润; 小林智久; 土屋诚
Original assignee: Kyowa Industrial Co Ltd
Current assignee: Kyowa Industrial Co Ltd
Priority date: 2022-07-22
Filing date: 2023-04-25
Publication date: 2024-01-23
Also published as: JP2024014492A

Abstract

The invention provides a mold device capable of changing an insert without turning the mold and manufacturing molded products with various sizes or shapes by one mold, and a molded product manufactured by using the mold device. The upper die has a first through hole having an inverted convex cross section and forming a first planar portion of a step, the first insert has a first enlarged diameter portion which is enlarged in diameter as compared with other portions and which engages with the first planar portion when disposed in the first through hole, and the second insert includes an insert body, a rod-shaped ejector pin for ejecting a molded article, a first ejector plate for moving the ejector pin, and a support member, and the insert body, the ejector pin, the first ejector plate, and the support member can be replaced integrally without removing the insert body, the ejector pin, and the support member when the insert is attached to or detached from the lower die.

Description

Mold device and molded article

Technical Field

The present invention relates to a mold device capable of replaceably attaching and detaching an insert, and a molded article molded using the mold device.

Background

In the related art, a mold device 102 shown in fig. 7 is known as a molding mold device for a resin material. Here, the mold 104 includes an upper die plate 104a and a lower die plate 104b, and is configured to be capable of being opened and closed as shown in fig. 7 (a) and opened as shown in fig. 7 (b).

In addition, an insert 106, which is replaceably fitted in and mounted to the mold device 102, is disposed as another component inside the mold device 102. The insert 106 is configured such that a molding space 108 for producing a molded article (not shown) is formed between the die insert 106a and the punch insert 106b in a closed state.

In the lower die plate 104b and the punch insert 106b, ejector pins 110 are disposed so as to penetrate up and down, and the ejector plate 112 is raised in an open state to eject the molded article in the molding space 108, thereby removing the molded article from the die device 102.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 6-285914

Disclosure of Invention

Problems to be solved by the invention

However, in the conventional mold device 102, there is a problem that it takes time and effort to replace the insert 106. For example, when the die insert 106a fixed to the upper die plate 104a is replaced (see fig. 8 a), in order not to drop the die insert 106a, the upper die plate 104a needs to be turned over (the die is turned over) as shown in fig. 8 b first, and the fixing bolts 114 need to be removed as shown in fig. 8 c. Next, as shown in fig. 9 (a), after the die insert 106a is removed, it is necessary to reattach another die insert 106a' for producing a molded article having a different size or shape from that of the die insert to the upper die plate 104a, and as shown in fig. 9 (b), it is necessary to reattach the fixing bolt 114 and then perform a series of operations such as turning the die again.

On the other hand, when the punch insert 106b fixed to the lower die plate 104b is replaced (see fig. 10 a), the ejector pin 110 and the fixing bolt 116 first need to be removed from the lower die plate 104b as shown in fig. 10 b. Next, as shown in fig. 11 (a), it is necessary to perform a work of re-fixing another punch insert 106b' for producing a molded article having a different size or shape from that of the other punch insert to the lower die plate 104 b.

Here, as shown in fig. 11 (b), when the other punch insert 106b' is newly fixed to the lower die plate 104b, the positions of the ejector pins 110 may not match the positions of the ejector pins in the original punch insert 106 b.

Therefore, in the conventional mold device 102, the lower die plate 104b cannot be used in common when forming molded articles having different sizes or shapes, and one lower die plate 104b needs to be prepared for one molded article having one size or shape, which results in a problem of an increase in cost.

In addition, a box type mold is known as a small mold for injection molding (for example, refer to patent document 1), but the strength is insufficient, and it is difficult to apply the mold to large-scale molding or press molding.

The present invention provides a mold device capable of changing an insert without turning the mold and manufacturing molded articles of various sizes or shapes with one mold, and a molded article formed by using the mold device.

Means for solving the problems

The mold device according to the present embodiment is characterized by comprising:

a pair of upper and lower molds that can be opened and closed;

a first insert interchangeably mounted to the upper die; and

a second insert interchangeably mounted on the lower die,

the upper die has a first through hole with a reverse convex section forming a first plane part of the step,

the first insert includes a first enlarged diameter portion which is enlarged in diameter as compared with other portions and which engages with the first flat surface portion when disposed in the first through hole,

the second insert includes: the insert body, the rod-shaped ejector pin for ejecting the molded article, the first ejector plate for moving the ejector pin, and the support member can be replaced integrally without removing the insert body, the ejector pin, the first ejector plate, and the support member when the insert body, the ejector pin, the first ejector plate, and the support member are attached to or detached from the lower die.

That is, by using such a shape for the mold device, the insert can be replaced without turning over the mold, and molded articles of various sizes or shapes can be produced with one mold. In addition, since the same mold can be used for manufacturing molded articles of various sizes and shapes, cost saving can be achieved. Further, by adopting a simple structure in which the insert itself is replaced, sufficient strength can be maintained, and the mold can be applied to large-scale molding and press molding requiring high pressure.

In the mold device according to the present embodiment, the first insert is attached to the upper die, and an upper end portion of the first insert is exposed from the upper die.

Thus, the insert can be replaced without turning over the mold.

In the mold device according to the present embodiment, the lower mold is provided with a common ejector plate, and the ejector plate is formed by stacking the first ejector plate that is replaced together with the second insert and the second ejector plate that is not replaced together with the second insert.

Accordingly, the ejector pins can be reliably ejected by the second ejector plate, and the second ejector plate does not need to be replaced, so that the load of insert replacement work can be reduced.

In addition, the die device according to the present embodiment is characterized in that the die device is used for press molding.

That is, the present invention is preferably used for a press molding die apparatus.

The molded article of the present invention is obtained by press molding using the above-described die apparatus.

Examples of applications of the molded article produced by using the mold device include large-sized flat plate-shaped members such as bathroom bread bricks, bathtub skirts, bathroom cabinets, wall panels, sunroof materials for vehicles, automobile chassis, pedestals, tables, and chairs.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a mold device capable of changing an insert without turning over a mold, and capable of manufacturing molded articles of various sizes or shapes with one mold, and also capable of providing molded articles molded by using the mold device.

Drawings

Fig. 1 is a schematic view showing an open/closed state of a press mold apparatus according to an embodiment.

Fig. 2 is a diagram showing a process of removing the fixing bolt from the first insert in the press mold apparatus according to the embodiment.

Fig. 3 is a diagram showing a process of replacing the first insert with another first insert for molding a molded article of a different size or shape in the press molding die apparatus according to the embodiment.

Fig. 4 is a diagram showing a preparation stage of removing the second insert from the lower die in the press molding die apparatus according to the embodiment.

Fig. 5 is a diagram showing a process of replacing the second insert with another second insert for molding a molded article of a different size or shape in the press molding die apparatus according to the embodiment.

Fig. 6 is a schematic view illustrating a state in which the ejector pin is protruded above the second insert by raising the ejector plate in the press molding die apparatus according to the embodiment.

Fig. 7 is a schematic view showing an open/closed state of a conventional mold device.

Fig. 8 is a diagram showing a process of turning over an upper die and detaching a fixing bolt in a conventional die apparatus.

Fig. 9 is a diagram showing a process of replacing a die insert with another die insert for molding a molded article of a different size or shape in the upper die of the conventional die apparatus.

Fig. 10 is a diagram showing a process of removing ejector pins from a lower die in a conventional die apparatus.

Fig. 11 is a diagram showing a process of replacing a punch insert with another punch insert for forming a molded article of a different size or shape in a lower die of a conventional die apparatus.

Detailed Description

Hereinafter, a press molding die device according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 (a) is a schematic view showing a closed state of the press molding die device 2, and fig. 1 (b) is a schematic view showing an open state thereof. As shown in fig. 1 (a) and (b), the press molding die device 2 includes a pair of openable and closable dies 4 composed of an upper die 4a and a lower die 4 b; and a pair of inserts 6 respectively replaceably mounted inside the mold 4.

The insert 6 includes a first insert 6a as a female insert to be fitted into the upper die 4a and a second insert 6b as a male insert to be fitted into the lower die 4b, and a molding space 9 for producing a molded article (not shown) is formed between the first insert 6a and the second insert 6b in a closed state.

The upper die 4a has a first through hole 5 at the center for inserting the first insert 6a, and the first through hole 5 has a shape of an inverted convex cross section with an enlarged diameter at the upper end. Therefore, a first flat surface portion 5a constituting a step is formed above the first through hole 5. In the present embodiment, the diameter does not necessarily mean the diameter of a cylinder, and includes the concept of the width of a square cylinder (a cylinder body having a polygonal cross section, for example, a square tube).

The first insert 6a penetrates the upper die 4a through the first through hole 5, and has a shape in which an upper end thereof is exposed above the press molding die device 2. The first insert 6a has a concave central section in an inverted convex shape, and has a first enlarged diameter portion 6x having a larger diameter than the other portion above the concave central section.

Thus, the first enlarged diameter portion 6x is engaged with the first flat surface portion 5a of the upper die 4a, and the first enlarged diameter portion 6x is fixed to the first flat surface portion 5a by the bolts 8, whereby the first insert 6a is mounted to the upper die 4a.

In the press molding die device 2, it is necessary to perform steam temperature adjustment because the die temperature needs to be increased. Therefore, the first insert 6a is provided with a connection portion (not shown) for connecting a hose (flow path) of a steam temperature regulator (not shown). As the connection portion, for example, a connection portion that can be connected by combining a socket (the side on which the hose is located) and a plug (the side on which the insert 6 is located) is used. Specifically, as the connection portion, a CUPLA (manufactured by riken corporation/registered trademark) manufactured by riken corporation or the like is preferably used.

In this way, by combining the socket and the plug to perform connection, the sealing function of the connection portion can be completed within the range of the first insert 6a, and the problem of deterioration of the sealing property can be avoided when the first insert 6a is replaced.

The lower die 4b includes a lower die main body 10, a space block 12 forming a space for allowing a later-described ejector plate 20 to move, and a base 14. The lower die body 10 also has a second through hole 16 for centrally inserting the second insert 6b. Since the second through hole 16 has an inverted convex shape, a second flat surface portion 16a constituting a step is formed above the second through hole 16.

The second insert 6b includes: the second insert body 17, a rod-shaped ejector pin 18 for ejecting the molded article, a first ejector plate 20a (described later) for moving the ejector pin 18, and a support member 21 as a pressure receiving pin for supporting the second insert body 17.

Here, the second insert body 17 penetrates the lower die body 10 through the second through hole 16, and includes a second enlarged diameter portion 6y having a diameter larger than that of the other portion. Therefore, the second insert body 17 is attached to the lower die body 10 by engaging the second expanded diameter portion 6y with the second flat surface portion 16a of the lower die body 10 and fixing the second expanded diameter portion 6y to the second flat surface portion 16a with the bolts 8. The second insert body 17 also has the same connecting portion as the first insert 6a.

The ejector plate 20 is configured by stacking a first ejector plate 20a penetrating the ejector pin 18 and a second ejector plate 20b supporting the lower end of the ejector pin 18 in the vertical direction, and functions as an operation source for moving the ejector pin 18 (see fig. 6). The first ejector 20a is included in the second insert 6b and is replaced with the second insert 6b, but the second ejector 20b is not included in the second insert 6b and is not replaced with the second insert 6b.

By forming the ejector plate 20 in a double structure in this way, the ejector pins 18 can be reliably ejected or retracted by the second ejector plate 20b, and the second ejector plate 20b does not need to be replaced, so that the load of the replacement work of the insert 6 can be reduced.

The support member 21 has a function of preventing the second insert body 17 from being deformed or broken by the forming pressure, and has a cylindrical shape with a diameter of about 50mm to 150 mm. The support member 21 is preferably disposed at a plurality of positions at a pitch of, for example, about 100mm to 300mm so as not to overlap with the positions of the ejector pins 18.

Next, a procedure for replacing the first insert 6a in the upper die 4a will be described. First, as shown in fig. 2 (a), the bolt 8 is removed from the upper die 4a to which the first insert 6a is attached (see fig. 2 (b)). Next, as shown in fig. 3 (a), the first insert 6a is suspended by a not-shown crane (crane), and the first insert 6a is suspended from the upper die 4a.

Next, another first insert 6a 'for forming a molded article having a different size or shape from the first insert 6a is suspended by a crane, lowered into the first through hole 5 of the upper die 4a, and the first insert 6a' is fixed to the upper die 4a by the bolt 8 while the first expanded diameter portion 6x is engaged with the first flat surface portion 5a (see fig. 3 (b)). In fig. 3, the case where the other first insert 6a 'is a product for producing a molded article having a smaller size or shape than the first insert 6a is exemplified, but the other first insert 6a' may be a product for producing a molded article having a larger size or shape than the first insert 6a.

In this way, the first insert 6a has the inverted convex cross-section, and the upper die 4a has the first through hole 5 having the step of the enlarged diameter at the upper end, whereby the first insert 6a is engaged with the step of the upper die 4a, and the first insert 6a can be easily replaced with another first insert 6a' without turning the die.

Next, a step of replacing the second insert 6b in the lower die 4b will be described. First, as shown in fig. 4 (a), the bolt 8 is detached from the second insert 6b attached to the lower die body 10 (see fig. 4 (b)). Next, as shown in fig. 5 (a), the second insert 6b is suspended by a not-shown hoisting device, and the second insert 6b is suspended from the lower die main body 10. The second insert 6b is integrally lifted up in a state of including the second insert body 17, the ejector pins 18, the first ejector plate 20a, and the support member 21. On the other hand, the second ejector plate 20b remains on the base 14 of the lower die 4b as it is.

Next, another second insert 6b 'for forming a molded article having a different size or shape from the second insert 6b is suspended by a crane, lowered into the second through hole 16 of the lower die body 10, and the other second insert 6b' is fixed to the lower die body 10 by the bolt 8 while the second expanded diameter portion 6y is engaged with the second flat surface portion 16a (see fig. 5 (b)). In fig. 5, the case where the other second insert 6b 'is a product for producing a molded article smaller in size or shape than the second insert 6b is exemplified, but the other second insert 6b' may be a product for producing a molded article different in size or shape from the second insert 6b, as in the case of the first insert 6a.

In this way, the second insert 6b includes the second insert body 17, the ejector pin 18, the first ejector plate 20a, and the support member 21, and thereby the second insert 6b can be replaced integrally with the other second inserts 6 b'. This can solve the problem of inconsistent positions of the ejector pins 18 when molded articles having different sizes or shapes are manufactured (see fig. 11 b). Therefore, the lower die 4b can be shared, and molded articles of various sizes or shapes can be produced with one die, so that cost saving can be achieved.

After the second insert 6b is replaced, when the molding is completed, the ejector plate 20 is raised as shown in fig. 6, so that the ejector pins 18 protrude above the second insert 6b ', and the molded article is removed from the second insert 6 b'.

According to the present embodiment, it is possible to provide the press molding die device 2 capable of replacing the insert 6 without turning the die, and capable of manufacturing molded articles of various sizes and shapes with one die. In addition, by adopting a simple structure in which the insert 6 itself is replaced, the insert 6 and the die 4 can maintain sufficient strength, and can be applied to large-scale molding or press molding.

In the conventional mold device 102 (see fig. 7) for molding a resin material, a connection portion for connecting a hose (circuit) is provided outside the insert 106, and an O-ring is attached to an end portion of the insert 6, whereby a sealing function of the insert 106 is achieved, but in this case, it is necessary to remove moisture from an inlet/outlet of the hose (flow path) every time the insert 106 is replaced. Further, there is a problem in that when the mold temperature increases, the sealing function of the insert 106 is lowered due to the O-ring deterioration.

However, according to the present invention, by connecting the socket and the plug in combination, the sealing function of the connecting portion can be achieved within the range of the insert 6, and the O-ring is not degraded. Therefore, the sealing function at the time of replacing the insert 6 can be improved. In addition, since the trouble of removing moisture can be eliminated, the insert 6 can be replaced more easily.

In the above embodiment, the case where the upper die 4a is a fixed-side mounting plate and the lower die 4b is a movable-side mounting plate has been exemplified, but the upper die 4a may be a movable-side mounting plate and the lower die 4b may be a fixed-side mounting plate. Of course, any one of the molds 4 may be an upper mold or a lower mold.

In the above embodiment, the support member 21 may not be necessarily cylindrical, and may be replaced with a prism or the like as long as it has a support function. The arrangement interval of the support members 21 is not limited to a pitch of 100mm to 300 mm.

In the above embodiment, the press molding die device 2 is shown as an example of the die device, but the present invention does not exclude an injection molding die.

In the above embodiment, a thermoplastic resin, a thermosetting resin, or the like can be used as the molding material. Is particularly suitable for shaping sheet molding compound of large-scale thermosetting resin.

Symbol description

2 stamping forming die device

4 mould

4a upper die

4b lower die

5 first through hole

5a first planar portion

6 insert

6a first insert

6b second insert

6x first diameter-enlarging portion

6y second expanded diameter portion

8 bolt

9 forming space

10 lower die main body

12 space block

14 base

16 second through holes

16a second plane portion

17 second insert body

18 ejector pin (ejector pin)

20 ejector plate (ejector plate)

20a first ejector plate

20b second ejector plate

21 support member

102 die device

104 mould

104a upper template

104b lower template

106 insert

106a die insert (Upper insert)

106b male die insert (lower insert)

108 forming space

110 ejector pin

112 ejector plate

114 fixing bolt

116 for fixing the bolt.

Claims

1. A mold apparatus, comprising:

a pair of upper and lower molds that can be opened and closed;

a first insert replaceably mounted to the upper die; and

a second insert replaceably mounted to the lower die,

the upper die is provided with a first through hole which forms a first plane part of the step and has an inverted convex section,

2. The mold apparatus of claim 1, wherein,

the first insert is attached to the upper die, and an upper end portion thereof is exposed from the upper die.

3. The mold device according to claim 1 or 2, wherein,

the lower mold is provided with a shared ejector plate, and the ejector plate is formed by stacking the first ejector plate which is replaced together with the second insert and the second ejector plate which is not replaced together with the second insert.

4. The mold apparatus of claim 1, wherein,

the die device is used for stamping forming.

5. A molded article, characterized in that,

the molded article is obtained by press molding using the die set according to any one of claims 1 to 4.