JPH0642814Y2 - Foam molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a foam molding apparatus for integrally molding a molded product from a skin sheet and a foam.

[Prior Art] For example, a foam-molded article integrally molded from a skin sheet having a grain pattern on its surface and a foam obtained by curing a foaming resin is widely used as an interior body incorporating an automobile instrument panel or the like. Has been.

In this case, the mold for molding the foam has an air suction passage when filling the cavity with a liquid foaming resin, and a vent passage for gas generated when the foaming resin reacts. It is provided.

[Problems to be Solved by the Invention] However, there is a problem in that the liquid foamable resin with which the cavities are filled penetrates into these passages and is cured, and the passages are blocked. For this reason, the work of removing the foamable resin that has hardened in the passage must be performed for each shot, and the efficiency and simplification of the entire molding work cannot be achieved.

The present invention solves this kind of problem, and it is possible to prevent the cured foaming resin from remaining in the gas discharge passage in the foaming mold as much as possible, thereby improving the efficiency of molding work. It is an object of the present invention to provide a foam molding apparatus that can easily achieve the above.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a molding die for molding a skin sheet corresponding to the shape of a molded product, and a foam molding for integrally molding a foam on the skin sheet. And a mold, wherein the mold has a molding portion for providing a groove portion in a portion other than the shape of the molded article of the skin sheet, the foam molding die has a groove portion in a gas lead-out passage leading to a cavity for the molded article. In order to communicate with each other, an opening is provided at a position corresponding to the groove.

[Operation] In the foam molding apparatus according to the present invention described above, when the skin sheet molded in the shape of a molded article through the molding die is arranged in the foam molding die, the groove portion provided in the skin sheet is It communicates with the gas outlet passage through the opening of the foaming mold. Then, the cavity of the foaming mold is filled with the foaming resin, and a molded article is obtained from the skin sheet and the cured foaming resin. At that time, the foamable resin flowing to the gas outlet passage side is housed in the groove portion of the skin sheet and hardened, and taken out from the foaming mold integrally with the skin sheet.

[Embodiment] The foam molding apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a foam molding apparatus according to this embodiment. The foam molding apparatus 10 includes a molding die 20 that molds a skin sheet 12 corresponding to the shape of a molded product, and a foam molding die 22 that integrally molds a foam 14 on the skin sheet 12 (see FIG. 2 and FIG. (See FIG. 3).

The skin sheet 12 is a composite sheet obtained by laminating a leather sheet made of polyvinyl chloride or the like and a polyolefin foam sheet, while the foam body 14 is made of a rigid urethane foam resin.

As shown in FIGS. 1 and 2, the molding die 20 has a base.
24, and the columns 24a to 2 are provided at the four corners of the base 24, respectively.
6d is erected. A crown 28 is provided above the columns 26a to 26d.
Cylinder attached to this crown 28
A die ram 32 is suspended from a piston rod 30a extending vertically downward from 30. The die ram 32 is guided by the columns 26a to 26d to be lifted and lowered, and a frame ram 34 is provided below the die ram 32 and is also vertically moved under the action of an actuator (not shown) which is also guided by the columns 26a to 26d. It is arranged.

The frame ram 34 is equipped with four gripping means 36 capable of gripping the corners of the flat sheet-like skin sheet 12. The gripping means 36 is configured to be able to release the gripping action of the skin sheet 12 by a pressing means (not shown) provided on the frame ram 34.

The lower mold 38 is arranged on the base 24, while the upper mold 40 is arranged on the mold ram 32.
The lower mold 38 and the upper mold 40 are
42 is formed. One or more long convex portions 44 are formed on the lower die 38 outside the cavity 42 (a portion other than the shape of the molded product) and surround the cavity 42, and the upper die 40 corresponds to the convex portion 44. Then, one or more elongated concave portions 46 are provided, and the convex portion 44 and the concave portion 46 form a molding portion 47. The upper mold 40 is provided with a so-called porous electroformed body having a grain pattern on the surface, and a porous layer is provided on the back side of the electroformed body and connected to a vacuum suction mechanism (not shown). Lower mold 38
Similarly has a porous layer and is directed to the upper mold 40 to discharge the pressurized air.

As shown in FIG. 3, the foaming mold 22 includes a base 48,
A lower die 50 provided with a suction mechanism (not shown) is arranged on the base 48, and an upper die 52 is arranged above the lower die 50 so as to be vertically movable. Cavity for molded products by lower mold 50 and upper mold 52
54 are defined. The cavity 54 communicates with a nozzle 58 via a passage 56, and also communicates with a gas outlet passage 60, which is a passage for air suction and / or gas vent of the upper mold 52.

The lower die 50 is formed with an opening 62 corresponding to a groove (described later) formed in the skin sheet 12 through the molding die 20 and for communicating the groove with the passage 60.

Although not shown, a trimming device is provided near the foaming mold 22.

The foam molding apparatus according to this embodiment is configured as described above, and its operation will be described next.

First, in the molding die 20, the frame ram 34 and the die ram 32 are
The flat skin sheet 12 heated to a predetermined temperature is gripped by the gripping means 36 provided at the position shown in FIG. 1 and provided on the frame ram 34.

Next, the frame ram 34 is lowered along the columns 26a to 26d under the action of an actuator (not shown), and the skin sheet 12 is engaged with the lower mold 38. Further, the piston rod 30a is displaced vertically downward under the driving action of the cylinder 30, and the die ram 32 suspended by this is similarly lowered under the guiding action of the columns 26a to 26d. At that time, the compressed air is discharged from the lower mold 38 to the skin sheet 12, and the skin sheet 12 is adsorbed to the upper mold 40 under the action of a suction mechanism (not shown).

In this way, the supply of compressed air in the lower mold 38, the upper mold 40,
Suction can be easily performed, for example, by adopting the mold structure disclosed in JP-A-61-272126. Therefore, the skin sheet 12 has the grain pattern transferred to the surface portion and is formed into a predetermined shape.

At that time, as shown in FIG. 4, the skin sheet 12 has a trimming portion 72 which is a portion other than the molded article shape 70 in addition to the molded article shape 70. And this trimming site
Two groove portions 74 are formed on the surface 72 so as to protrude toward the front side via the convex portion 44 and the concave portion 46 that form the molding portion 47.

After the forming work of the skin sheet 12 is completed, the mold ram 32 is raised via the piston rod 30a under the driving action of the cylinder 30, the upper mold 40 is separated from the lower mold 38, and the frame ram is formed.
34 is lifted under the driving action of a driving source (not shown), and the skin sheet 12 held by the gripping means 36 is separated from the lower mold 38 and the upper mold 40. Further, the gripping action of the skin sheet 12 is released under the action of the pressing means (not shown). that time,
The skin sheet 12 is sandwiched by conveying means (not shown), and the skin sheet 12 is transferred from the molding die 20 to the foam molding die 22 side.

In the foam molding die 22, the upper die 52 is raised, and the skin sheet 12 is placed on the lower die 50 with the grain pattern side facing downward. Here, the groove portion 74 formed in the skin sheet 12 is engaged with the opening portion 62 of the lower mold 50.

After the skin sheet 12 is adsorbed to the lower mold 50 under the action of a suction mechanism (not shown), a hard urethane foamed resin which is a foamable resin is supplied from the nozzle 58 to the passage 56, and this foamable resin is used for the cavity 54. Filled inside.

In this case, the passage 60 and the like are used for sucking the inside of the cavity 54 to fill the cavity 54 with the foamable resin and for discharging the gas generated by the reaction of the foamable resin to the outside. Therefore, the foamable resin is
Groove of the skin sheet 12 that flows to the side and communicates with the passage 60.
It is housed in 74 (see FIG. 5).

The foamable resin in the cavity 54 reacts and foams, whereby the foam 14 is integrally molded on the back surface side of the skin sheet 12.

Next, the suction mechanism provided in the lower mold 50 is deenergized, and the molded body 100 is released from the foam molding mold 22 via the transporting means (not shown).

Further, this molded body 10 is passed through a trimming device (not shown).
The trimming portion 72 including the groove portion 74 is separated from 0, and a desired molded product is obtained.

At that time, as described above, the unnecessary foaming resin that has flowed to the passage 60 side is cured in the groove 74 provided in the skin sheet 12 and taken out of the foaming mold 22 integrally with the molded body 100. . Therefore, it is possible to prevent unnecessary foamable resin from remaining in the passage 60 of the foam molding die 22, and it is possible to efficiently and easily carry out the foam molding work all at once.

Moreover, since the unnecessary foamable resin is taken out integrally with the molded body 100, the effect that the unnecessary foamable resin can be removed together with the trimming portion 72 is obtained by the trimming process.

Furthermore, the positioning operation of the skin sheet 12 can be performed simply and accurately by simply making the groove portion 74 of the skin sheet 12 correspond to the opening portion 62 of the lower mold 50.

[Effects of the Invention] As described above, the foam molding apparatus according to the present invention has the following effects and advantages.

Since the groove provided on the skin sheet through the forming die communicates with the gas outlet passage through the opening of the foam forming die,
The foamable resin flowing to the passage side is housed in the groove and cured, and then taken out of the foaming mold integrally with the skin sheet. Therefore, it is possible to prevent unnecessary foaming resin from remaining in the foaming mold, and it is possible to easily achieve the efficiency of the entire foaming operation.

Moreover, since the unnecessary foaming resin adheres to a portion of the skin sheet other than the shape of the molded product, it can be integrally removed by trimming the skin sheet.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a foam molding apparatus according to the present invention, FIG. 2 is a vertical sectional view of a molding die which constitutes the foam molding apparatus, and FIG. 3 is a vertical section of a foam molding die which constitutes the foam molding apparatus. A front view, FIG. 4 is an explanatory view of a skin sheet formed by the forming die, and FIG. 5 is a partially enlarged explanatory view of the forming apparatus. 10 ... Foam molding device 12 ... Skin sheet 20 ... Mold 22 ... Foam mold 44 ... Convex part 46 ... Concave part 47 ... Mold part 54 ... Cavity 60 ... Passage 62 ... Opening part 70 ... Molded product shape 72 ... Trimming part 74 ... Groove 100 ... Molded body

Claims (1)

[Scope of utility model registration request] 1. A molding die for molding a skin sheet according to the shape of a molded article, and a foam molding die for integrally molding a foam on the skin sheet, wherein the molding die is a molded article of a skin sheet. It has a molding portion for providing a groove portion in a portion other than the shape, the foaming mold has an opening at a position corresponding to the groove portion in order to communicate the groove portion with a gas outlet passage leading to a cavity for a molded product. A foam molding apparatus characterized by having.