JPS6362371B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mold for a foamed resin molded article.

Generally, a mold used for molding to obtain a foamed resin molded article consists of a mold body and a mold-constituting lid provided on the mold body so as to be openable and closable.
As shown in FIG. 1, in a conventional mold, a mold body 1 is provided with one mold-constituting lid 2 (that is, a mold-constituting lid 2 is provided only at one location on the mold body 1). ) structure, the foamed resin molded body 3 molded by such a mold can only have a simple, substantially flat shape as illustrated in FIG. Therefore, with such a conventional mold, it is impossible to obtain a molded article having a complicated shape, which includes a bottom plate portion and a plurality of rising portions erected on the bottom plate portion. In addition, some special conventional molds have mold-constituting lids installed in two places on the mold body, but this has its own limits on the shape that can be given to the molded product, and so Moreover, it is impossible to obtain a molded article having the above-mentioned complicated shape.

As described above, with conventional molds, it was not possible to obtain a structure comprising a bottom plate portion and a plurality of rising portions as an integrally molded product due to problems in demolding operation associated with the structure. The method used is to divide the structure into several parts and manufacture each part separately, and then assemble these parts together to make the finished product.As a result, the manufacturing process is inevitably complicated, and The products thus obtained also had to be expensive.

The present invention solves the above-mentioned conventional drawbacks, and aims to provide a mold for obtaining a foamed resin molded body formed by integrally molding a bottom plate portion and a plurality of rising portions.

Embodiments of the present invention will be described below based on the drawings.

3 to 7 show an embodiment in which the present invention is applied to a mold for obtaining a chair made of synthetic resin foam. 13 and a rear plate 14 that connects the side plates 12 and 13. Each side plate 12, 13 is provided with a stepped portion 15, which allows the side plate high portions 12a, 13a and the side plate low portion 12 to
b, 13b are formed. Each side plate lower part 1
2b, 13b are provided with flanges 16, 17, and a generally fan-shaped end plate 1 is provided at one end of the flanges 16, 17.
8 and 19 are arranged in series. The upper end of the rear plate 14, the flanges 16 and 17 of the side plates 12 and 13, and the bottom plate 11
At the front end of the mold structure lid bodies 20, 21, 22,
23 is pivotally connected so as to be openable and closable, and the mold body 1
Mold structure lid body 20, 21, 22, 23 in 4 places of 0
is provided. These mold-constituting lid bodies 20, 2
Although the mounting structure, ie, the pivoting mechanism for 1, 22, and 23 is not particularly illustrated, a conventionally known openable/closeable structure using a hinge or the like can be adopted. 24,2
5, 26, and 27 indicate pivot parts.

The first mold-constituting lid 20 has an arc-shaped notch 28
a, 28b, and a seat molding plate 29. The second and third mold-constituting lids 21 and 22 each have a handle formed as a substantially semicircular curved plate. It consists of part molding plates 30, 31 and side plate part molding plates 32, 33. Fourth mold structure lid body 2
3 includes a horizontal portion 23a and vertical portions 23b and 23c having substantially semicircular heads. The seat molding plate 29 is pivotally attached to the backrest molding plate 28, and the side plate molding plates 32 and 33 are pivotally attached to the handhold molding plates 30 and 31, respectively, so that they can be opened and closed. Although this pivot mechanism is not particularly shown in the drawings, it may have a structure that can be freely opened and closed using a hinge or the like, as in the case described above. 34, 35, and 36 indicate pivot parts.

Mold body 10 and mold constituent lid bodies 20, 21, 22,
23 materials include metals such as aluminum and iron;
Various materials such as synthetic resins such as silicone resins, rubber, and plywood can be used.

In the mold 37 configured as described above, the mold-constituting lids 20, 21, 22, 23 are arranged in the directions indicated by the arrows A, 27, 24, 25, 26, and 27, respectively.
When closed by rotating in directions B, C, and D (Fig. 3),
A chair-shaped mold as shown in FIG. 4 is obtained.
In this mold configuration lid fully closed state, the seat molding plate 2
9, the horizontal part 23a of the fourth type constituting lid 23, and the bottom plate 11 constitute the bottom plate part mold surface 38, and the backrest part molding plate 28, the rear plate 14, and the side plate high parts 12a, 13a. A first rising mold surface 39 is configured, and side plate molding plates 32 and 33 are formed.
, handhold molded plates 30, 31 and side plate lower portion 12
b, 13b and the vertical portion 23 of the fourth type constituent lid body 23
b and 23c constitute second and third rising mold surfaces 40 and 41, respectively. In addition, in the fully closed state, the arc surfaces of the end plates 18 and 19 and the notch 2
By continuing the circular arc surfaces of 8a and 28b, a substantially semicircular ridgeline corresponding to the handhold molding plates 30 and 31 is formed, and the handhold molding plates 30 and 31 are formed on this ridgeline, respectively. One end edge K ₁ and L ₁ of 31 are connected. Furthermore, the side edge M ₁ of the side plate portion molded plates 32, 33,
N ₁ is connected to side edges O ₁ and O ₂ of the backrest portion forming plate 28, respectively. Therefore, the inner space of the first rising mold surface 39 and the inner spaces of the second and third rising mold surfaces 40 and 41 are in communication with each other. Furthermore, the inner cavities of the mold surface 39 and the bottom mold surface 38, and the mold surface 38 and the mold surface 40,
The inner cavities 41 are also in communication with each other. The substantially semicircular head of the fourth type lid 23 is connected to the other edges K ₂ , L ₂ of the handhold molding plates 30 , 31 and the edges P ₁ , L 2 of the seat molding plate 29 . P ₂ and P ₃ are the lower edges M ₂ and N ₂ of the side plate molding plates 32 and 33, respectively, and the fourth type constituent lid body 2
It is connected to the upper edge Q of the horizontal part of No. 3.

In the fully closed state, each mold component lid body 20, 2
1, 22, 23 and how to connect, fix, and seal the mutual connecting parts between the mold body 10 and each mold constituent lid body 20, 21, 22, 23,
Although the means for this purpose is not particularly illustrated, a connection structure used in conventional molds can be employed. That is, for example, a connector attachment part (for example, a flange-like protrusion) is provided on the connection part, and a bolt,
The connecting parts may be connected and fixed by attaching a connecting tool such as a nut.

When molding is performed using the mold 37, the lid of the mold is opened and a foaming solution such as polyol,
A method may be used in which TDI and water are stirred and injected into the mold 37 together with a suitable catalyst, and the lid is closed and molded (open mold method), or an injection port is provided, for example, at the bottom of the mold 37. Alternatively, a method (closed mold method) may be used in which the foaming stock solution is stirred and injected from the injection port while the mold-constituting lids 20, 21, 22, and 23 are closed, and then molded. When an open mold method is adopted, all or a part of the first, second and third mold-constituting lids 20, 21, 22 may be opened when injecting the foaming stock solution; Of the type 1 lid 20, only the seat molding plate 29 may be opened. Note that the inner surface of the mold 37 is coated with a release agent (or coated with release paper) in advance. Further, when injecting the foaming stock solution, a reinforcing material or lightweighting material 42 made of paper material such as cardboard or cardboard, wood such as plywood, synthetic resin, metal, etc. can be attached in advance to the mold 37.

The injected foaming stock solution causes a chemical reaction within the mold 37, generates gas, and starts foaming. The foam that continues to expand spreads throughout the inner cavities of the mutually communicating mold surfaces 38, 39, 40, and 41, thus creating a foamed resin molded product with a reinforcing material or a lightweight material 42 embedded inside. 43 is molded (FIGS. 5 and 6). In this foam forming step, heat treatment is performed as necessary.

After foaming is completed, each mold component lid body 20, 21, 22,
23 is rotated in the directions of arrows E, F, G, and H in FIG. 3 to open it, and the molded body 43 is taken out from inside. In this way, the mold constituent lid bodies 20, 21, 22, 23 are 4
Since it opens in the direction, demolding of the molded body 43 is easy. In addition, in this embodiment, the fourth mold structure lid body 2
3 is not necessarily necessary, and it is possible to remove the mold by simply opening the first, second, and third mold-forming lids 20, 21, and 22. Therefore, the mold-forming lid 23 cannot be opened or closed. Instead of being configured as a lid, it may be configured as a part of the mold body 10. Therefore, it is sufficient that the mold-constituting lids are provided at at least three locations on the mold body 10.

As shown in FIG. 7, the molded body 43 thus obtained consists of a bottom plate portion 44 and three rising portions 45, 46, 47 erected on the bottom plate portion 44. The sections 46 and 47 are connected, and the rising section 45 and the rising sections 46, 4
A step portion 48 is formed between the portion 7 and the portion 7. The bottom plate portion 44 and each rising portion 45, 46, 47 are integrally molded with each other. The bottom plate part 44 corresponds to the seat part of the chair, similarly, the rising part 45 corresponds to the backrest part of the chair, and the rising parts 46 and 47 correspond to the side plate parts of the chair. Handle portions 49 and 50 having arcuate curved surfaces are formed on the upper surfaces of the rising portions 46 and 47. The molded body 43 constructed as described above is covered with a surface material such as cloth, leather, synthetic leather, etc., and is made into a finished product.

In the above embodiment, a chair is obtained as a foamed resin molded product, but the present invention is not limited to the case where the mold is a mold for a chair, and the present invention is not limited to the case where the mold is a chair mold. This can be similarly applied to molds for obtaining various molded bodies having a structure including a rising portion. The molded product manufactured by the mold of the present invention is not limited to one having three rising parts, but any molded product having a plurality of rising parts is suitable.
Further, the material of the molded body is not limited to polyurethane foam, but may be other synthetic resin foam.

In the mold of the present invention, the mold-constituting lids need to be provided in at least three places on the mold body, so the mold-constituting lids must be installed in four or more places depending on the shape of the intended molded product. It may be provided. Further, the mold-constituting lid may be attached at any location on the mold body, and therefore, for example, it can be attached to the side surface or the bottom surface of the mold body in addition to the top surface thereof. Incidentally, the reinforcing material or the lightweighting material 42 described in the above embodiment is not essential in the present invention, and may be constructed as a molded body having a structure in which it is not embedded.

As explained above, the mold of the present invention has a bottom plate molding surface and a rising molding mold surface, and mold-constituting lids are provided at at least three locations on the mold body.
It is possible to mold a complex-shaped molded body having a bottom plate portion and a plurality of rising portions, and it is easy to demold the mold after molding is completed. In particular, the present invention is effective for demolding undercut portions. As described above, according to the mold of the present invention, it is possible to integrally form a structure having a complicated shape by molding, so that the manufacturing process can be simplified.

In addition, since the foamed resin molded product obtained by the mold of the present invention has a structure in which the bottom plate portion and the plurality of rising portions are integrally molded with each other, a finished product can be easily produced by simply covering it with a surface material. This has the effect of making it easy to manufacture and providing inexpensive products. Therefore, the molded product obtained from the mold of the present invention is suitable for mass production, increases the added value of the product, and is extremely useful industrially.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a conventional mold, FIG. 2 is a perspective view showing a foamed resin molded article molded by the mold shown in FIG. 1, and FIGS. 3 is a perspective view of the mold with the mold-constituting lid opened, FIG. 4 is a perspective view of the mold with the mold-constituting lid closed, and FIG.
Figures 6 and 6 show the foamed resin molded body being molded in the mold shown in Figure 4, Figure 5 is a vertical sectional view taken along the - line in Figure 4, and Figure 6 is a cross-sectional view taken along the - line in Figure 4. FIG. 4 is a longitudinal sectional view taken along the line - in FIG. 4, and FIG. 7 is a perspective view of the foamed resin molded product molded by the mold. 10... mold body, 20, 21, 22, 23...
Mold configuration lid body, 37...Molding mold, 38...Bottom plate part mold surface, 39, 40, 41...Rising part mold surface, 43...Foamed resin molded body, 44...Bottom plate part,
45, 46, 47... Rising part.

Claims (1)

[Claims] 1 having a bottom plate molding surface and a rising molding mold surface, and comprising a mold body and a mold constituting lid body provided on the mold body so as to be freely openable and closable, and the mold constituting lid body covers at least one part of the mold body. A mold for a foamed resin molded article characterized by being provided at three locations.