JPH07121473B2 - Mold for press molding - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a press-molding suitable for use in press-molding a synthetic resin plate or an inorganic decorative plate having an uneven pattern on its surface, especially when it is manufactured by multi-stage press-molding. For molds.

2. Description of the Related Art Conventionally, when a synthetic resin plate or an inorganic decorative plate having an uneven pattern on its surface is manufactured by press molding, a press molding die 100 as shown in FIG. A press-molding die 100 is used in which an uneven molding surface 102 is formed by cutting the surface of a polished steel plate 101.

Problems to be Solved by the Invention However, in the case of forming the concave-convex molding surface 102 by cutting as described above, it is not easy to manufacture a large press-molding die, and the shape of the concave-convex molding surface 102 is produced every time. There is a problem that they are slightly different. In particular, when forming the concave-convex shaped surface 102 by cutting, it is necessary to use a thick polished steel plate 101 because the polishing steel plate 101 is distorted by the heat during cutting when the thickness of the polished steel plate 101 is small. There is also a problem that the weight of the working die 100 becomes considerably large, and it is not easy to attach the die to the press molding machine or take out the die.

Means for Solving Problems The press-molding die of the present invention has been made mainly for the purpose of solving the above-mentioned problems, and a plurality of metal plates are joined and integrated via a thermosetting resin adhesive layer. The metal plate on at least one side is an uneven plate processed by press forming or roll drawing.

Effects of the Invention In the press-molding die of the present invention having such a configuration, since the metal plate on at least one side constituting the uneven molding surface is an uneven plate processed by press molding or roll drawing, the uneven shape is obtained. Is almost exactly the same no matter how many times it is manufactured, and unlike the conventional mold, there is no inconvenience that the shape of the concave-convex molding surface is different for each manufacturing.

Further, even in the case of producing a large press-molding die, it is easy to create a large metal uneven plate by press molding or roll drawing, and this metal uneven plate is placed through a thermosetting resin adhesive layer. Since it is also easy to join and integrate with another metal plate, it becomes much easier to manufacture a mold, especially a larger mold, as compared with the conventional case.

Furthermore, when press molding of a synthetic resin plate or the like is performed using the mold of the present invention, the thermosetting resin adhesive layer acts as a cushioning material, so that the moldability is good, and the thermal expansion and contraction rate of the metal plate is slightly small. Even if they are different, the thermosetting resin adhesive layer absorbs the difference in thermal expansion and contraction, so that the press-molding die is not warped or distorted.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial perspective view of a press-molding die according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of the die.
In this press-molding die A, two upper and lower metal plates 1 and 2 are joined and integrated via a thermosetting resin adhesive layer 3.

The lower metal plate 1 is made of a flat polished steel plate,
For example, when manufacturing a large die A for press molding having a vertical dimension of about 180 cm and a lateral dimension of about 90 cm, a polished steel plate having a thickness of about 3 to 5 mm is preferably used.

On the other hand, the upper metal plate 2 has a thickness of 1-
By press-molding a polished steel plate of about 1.5 mm,
An uneven plate having a grid-shaped convex rib 21 (height of about 0.6 mm) is formed. The surface of the metal uneven plate 2 is an uneven molding surface (mold surface) when a synthetic resin plate or the like is press-molded. Becomes Needless to say, the metal concavo-convex plate 2 can be formed into a desired concavo-convex shape that can be press-molded.

The adhesive layer 3 for joining the upper and lower metal plates 1 and 2 is made of a thermosetting resin adhesive such as a heat-resistant silicone resin adhesive, and acts as a cushion material during press molding.
It also exerts an action of absorbing the difference in thermal expansion and contraction of both metal plates 1 and 2. Since these functions are satisfactorily exhibited when the thickness of the adhesive layer 3 is about 0.5 to 1.0 mm, preferably about 0.6 to 0.8 mm, the thickness of the adhesive layer 3 should be within the above range. desirable. Further, it is possible to bond the metal plate 1 and the metal concavo-convex plate 2 by impregnating glass fiber with the adhesive. This adhesive layer has more cushioning properties and stretch absorbability.

In the press-molding die having such a structure, a metal uneven plate 2 is formed by press-molding a polished steel plate of about 1 to 1.5 mm, and the metal plate 1 coated with a thermosetting resin adhesive in the above thickness is It is manufactured by stacking the metal concavo-convex plates 2 and heating them under pressure. In this way, since the metal concavo-convex plate 2 is formed by press molding, it can be extremely easily formed, and the joining work of the upper and lower metal plates 1 and 2 is also simple as described above. Compared with the case where a die is produced by cutting or etching the surface of a thick polished steel plate, the die is much easier to produce. Moreover, when the metal uneven plate 2 is formed by press molding, the uneven shape forming surface 22 of the metal uneven plate 2 has almost the same shape regardless of how many pieces are formed. The inconvenience that the shapes of the surfaces are different does not occur.

Next, an example of using this press molding die A will be described with reference to FIG. That is, this example of use refers to the case where a synthetic resin plate having an uneven pattern on the surface is obtained by press molding. According to this, a cushion paper 5 is laid on the base 4 of the press molding machine and a metal sheet is placed thereon. A flat plate 6 is overlaid, and a plurality of synthetic resin sheets 7 for thermocompression integration are overlaid thereon,
The mold A is laid on top of it with the concave-convex molding surface 22 facing downward, and in the same manner, the cushion paper 5, the metal flat plate 6, the synthetic resin sheet 7, and the mold A are sequentially stacked in a plurality of stages, and then from the top. The press plate 9 is heated and pressed to press-form a plurality of stages of synthetic resin sheets 7 at a time to obtain a synthetic resin plate with an uneven pattern.

When performing a multi-stage press as described above, the operator manually stacks and takes out the press-forming dies A,
The mold A has a total thickness of the metal substrate 1 and the metal uneven plate 2 of 4 to
As thin as about 5 mm and lighter than conventional molds,
The above work can be performed easily. In addition, since the thermosetting resin adhesive layer 3 acts as a cushioning material during press molding, the thickness variation of the molded product is small and the moldability is good, and small foreign matter on the surface of the metal plate 1 of the mold A. Even if a small amount of strain is generated on the metal plate 1 due to the pressure applied during the pressing, the metal concave-convex plate 2 is formed by the cushioning action of the adhesive layer 3.
Since there is no distortion and a slight recess (exvo) does not occur in the molded product, the number of defective products is greatly reduced. In addition, since the difference in thermal expansion and contraction between the metal plate 1 and the metal uneven plate 2 is absorbed by the thermosetting resin adhesive layer 3, the press molding die A does not warp.

FIG. 3 is a partial cross-sectional view showing another embodiment of the present invention. This press die B is a metal concave-convex plate 2 having convex ribs 21 formed on the upper and lower surfaces of a flat metal plate 1 by press molding. The thermosetting resin adhesive layers 3 and 3 are joined and integrated with each other so that both surfaces of the mold become the concave and convex molding surfaces 21 and 21. FIG. 4 is a partial cross-sectional view showing still another embodiment of the present invention. This press die C has two metal concave-convex plates 2 and 2 on which convex ribs 21 are formed by press molding and thermosetting resin. The adhesive layer 3 is joined and integrated, and both surfaces of the mold are configured to have the concavo-convex molding surfaces 21, 21.

Such press dies B and C are used in combination with the press dies A of the above-mentioned examples when a synthetic resin plate or the like having uneven patterns on both sides is produced by press molding. That is, as shown in FIG. 6, cushion paper 5 is laid on the base 4 of the press molding machine, and the pressing die A of the above-mentioned embodiment is laid on the cushion paper 5 with the concave-convex molding surface 22 facing upward. A plurality of synthetic resin sheets 7 and the above-mentioned molds B or C are alternately stacked in a plurality of stages, and the mold A of the above-mentioned embodiment is formed on the uneven surface.
22 is stacked downward, cushion paper 5 is further stacked, and a plurality of synthetic resin sheets 7 are press-molded at one time by heating and pressing from above with a press board 9 to form a synthetic resin plate having uneven patterns on both sides. Is obtained.

In the above-mentioned embodiments, all the metal concavo-convex plate 2 is press-molded, but the convex rib 21 may be formed by performing roll drawing instead of press-molding. Similar to the press forming, such a roll drawing process uses a polished steel plate of about 1.0 to 1.5 mm and can be processed with high accuracy. Therefore, the uneven shape of the uneven forming surface 2 is different every time the metal uneven plate 2 is created. Moreover, the machining work is much easier than the conventional cutting.

Further, the metal uneven plate 2 can be formed by etching a steel plate of about 0.3 to 1.5 mm, but in this case, it is suitable for obtaining a molded product having a small unevenness and a matte pattern. Further, in the above embodiment, an example in which a plurality of synthetic resin sheets are hot-pressed is given, but in the case where another synthetic resin plate presses a foam, an inorganic material, a building material or the like to form a pattern. Is also preferably adopted.

EFFECTS OF THE INVENTION As is apparent from the above description, in the press-molding die of the present invention, a plurality of metal plates are joined and integrated via a thermosetting resin adhesive layer, and at least one metal plate is pressed. Since it is composed of an uneven plate processed by molding or roll drawing, the production of the mold becomes much easier than before, and the uneven forming surface of the metal uneven plate does not change with each production, Further, since the weight is reduced, the work of installing and taking out the mold from the press molding machine becomes easy, and the moldability is excellent, and the number of defective products is significantly reduced.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a press molding die according to an embodiment of the present invention, FIG. 2 is an enlarged partial sectional view of the die, and FIGS. 3 and 4 are other embodiments of the present invention. FIG. 5 is a partial cross-sectional view of a press-molding die according to an example, FIG. 5 is an explanatory view of one use example of the press-molding die shown in FIG. 1, and FIG. 6 is FIG. 3 or 4.
FIG. 7 is an explanatory view of one example of use of the press-molding die shown in the figure, and FIG. 7 is a partial sectional view of a conventional die. 1, 2 …… Metal plate, 3 …… Thermosetting resin adhesive layer, A, B, C…
… Press molds.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-48144 (JP, A) JP-A-53-133592 (JP, A) Actual development: JP-A-55-66106 (JP, U)

Claims (1)

[Claims] 1. A plurality of metal plates are joined and integrated via a thermosetting resin adhesive layer, and at least one metal plate is an uneven plate processed by press molding or roll drawing. Mold for press molding.