JPH10225945A - Mold for skinned foamed molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the cleaning of a skin suction hole and to make a structure simple and economical. SOLUTION: In a mold equipped with a cavity 12 for molding a skinned foamed molded product wherein a skin and foam are integrated by injecting a foamable raw material on the inner side of the skin and having a skin suction hole 30 for holding the skin to the mold surface of the cavity under suction, a separation block 20 consisting of two or more blocks 21, 25 possible to separate and unite and having a suction groove 29 formed on the uniting surface of at least one block are attached to the recessed part 15 formed on the mold surface in a detachable manner, and a skin suction hole is constituted of the suction groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for a foam molded article with a skin.

[0002]

2. Description of the Related Art In general, foamed molded articles with a skin used for interior parts of automobiles are often formed by integral foaming of the skin. The skin integral foam molding uses a mold composed of a cavity mold and a press mold (sometimes referred to as a core mold) to form a cavity formed of a foam molded product in the cavity mold. On the mold surface, a skin made of a plastic sheet or the like is arranged, and a foaming material made of a urethane material or the like is injected and foamed on the inner surface side of the skin, and a foam formed thereby is integrated with the skin. . In addition, a core material (sometimes referred to as a base material, an insert, or a core material) made of a hard plastic, a metal, or the like is disposed on the pressing mold as needed.

By the way, depending on the shape and the like of the foam molded article with the skin, the skin arranged on the mold surface of the cavity is:
In some cases, the edge may rise to the inner surface of the skin, and in this case, simply placing the skin on the mold surface of the cavity may cause the rising portion to separate from the mold surface and fall into the cavity, resulting in a foam. May not be covered well with the epidermis.

Therefore, as shown in a cavity mold 60 shown in FIG. 9, a skin suction hole 63 is provided in a mold surface 62 of a cavity 61, and the skin is suctioned to the mold surface 62 through the skin suction hole 63 to hold it properly. Some things have been done. The skin suction hole 63 is provided on a mold surface in which the skin itself is difficult to maintain its shape, such as a mold surface on which a rising portion of an edge of the skin is to be arranged. The skin suction holes 6
Reference numeral 3 is connected to a suction device (not shown) such as a vacuum pump via a pipe or the like.

However, since the edge of the skin is easily deformed during molding or storage, it is often necessary to use the skin with the edge deformed for integral molding of the skin. In this case, as shown in FIG. 10, even if the rising portion 71 a of the skin 71 is sucked into the mold surface 62 through the skin suction hole 63, the edge of the skin 71 does not firmly adhere to the mold surface 62. Defective portions S were likely to occur. Also, as shown in this example, the skin 7
In the case where an edge 71b of the first rising portion 71a is bent toward the core material 72 to form a foam molded product having a structure in which the edge 71b is in close contact with the surface of the core material 72, the poor adhesion portion S is caused by the outer skin 71.
Of the core 72 as well as the deformation of the edge of the core 72. Reference numeral 64 denotes a push type.

[0006] When the poor contact portion S with the mold surface 62 is formed at the edge of the skin 71 in this way, when the foaming raw material 73 is filled with foam in the cavity, it leaks from the edge of the skin 71 and the poor contact portion S is removed. As a result, it enters between the skin 71 and the mold surface 62. Then, the foaming raw material 73 enters the skin suction holes 63 of the mold surface 62 and foams and hardens to block the skin suction holes 63, thereby preventing the suction of the skin 71. for that reason,
Frequently, an elongated rod such as a pin must be inserted into the skin suction hole 63 for cleaning, which is troublesome and poor in workability. In addition, the skin suction hole 63 has a small hole diameter to obtain a strong suction force, so that it is difficult to clean the skin suction hole 63 and cannot be completely cleaned. May hit the peripheral edge of the epidermis suction hole 63 and damage the peripheral edge.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and it is easy to clean the skin suction hole, and there is no risk of damage to the mold at that time, and the structure of the skin is simple. It is an object of the present invention to provide a molding die for a foamed molded product with a seal.

[0008]

According to the first aspect of the present invention, there is provided a cavity for injecting a foaming material into an inner surface of a skin to form a foamed molded article with a skin in which the skin and the foam are integrated. A molding die having a skin suction hole for sucking and holding the skin on a mold surface of the cavity, wherein at least one block is formed of two or more separable and unitable blocks in a recess formed on the mold surface. The present invention relates to a mold for a foam molded article with a skin, wherein a separation block having a suction groove formed on a surface thereof is detachably mounted, and a skin suction hole is formed by the suction groove.

According to a second aspect of the present invention, there is provided a cavity for injecting a foaming material into an inner surface of a skin to form a foamed molded article having a skin in which the skin and the foam are integrated, and a mold surface of the cavity. In a molding die having a skin suction hole for sucking and holding the skin, a separation block is detachably mounted in a recess formed in the mold surface, and is formed on at least one of surfaces of the recess and the separation block that are in contact with each other. The present invention relates to a molding die for a foam molded article with a skin, wherein the skin suction hole is formed by the suction groove formed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a main part of a cavity mold for a molding die for a foamed molded article with a skin according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. FIG. 4 is a perspective view showing a main part of the cavity mold with the separation block removed, FIG. 4 is a perspective view showing the separation block,
FIG. 5 is a partial cross-sectional view showing a state where a skin is arranged on a mold surface, FIG. 6 is a partial cross-sectional view of the mold showing foam molding, and FIG. 7 is a cavity of the mold according to an embodiment of the present invention. FIG. 8 is a perspective view showing a main part of a cavity mold of a molding die according to another embodiment.

A molding die 10 for a foamed molded product with a skin according to the first aspect of the present invention shown in FIGS. 1 and 2 has a cavity mold 11 having a cavity 12 in the form of a foamed molded product, and a cover for the cavity mold 11. A mold 18 (shown in FIG. 6) is provided, and a skin is arranged on the mold surface 13 of the cavity 12, while a core material is arranged on the mold 18, and a foaming material is injected into the inner surface of the skin. It is used for integral skin foam molding. The molding die 10 of this example is used for molding an instrument panel having a so-called partial pad in which a foam is provided on a part of a core material and the surface of the foam is covered with a skin. The molding die of the present invention is also applicable to a foam molded article with a skin in which a foam is provided on the entire surface of the core material and the surface of the foam is covered with a skin. The material of the molding die 10 is an appropriate material such as resin or aluminum.

The cavity mold 11 is, as can be better understood from FIG.
A recess 15 is formed from the parting surface 14 to the side mold surface 13a, and a separation block 20 shown in FIG. The part of the mold surface 13a to which the separation block 20 is mounted (the position of the recess 15)
Is a mold surface portion on which the skin arranged on the mold surface easily collapses at the time of integral foam molding of the skin, usually a mold surface on which the edge of the skin rising up in the cavity 12 is arranged. In particular, if the concave portion 15 is formed over the parting surface 14 which is to be combined with the pressing die 18 as in this example, the separation block 20
Can be performed from the parting surface 14,
Since the operation does not have to be performed from the inside of the narrow cavity 12, the workability is extremely improved. The recess 15 communicates with the outer surface of the cavity 11 through a horizontally long communication hole 16 formed in the inner side surface. The elongated hole 16
Is connected to a skin suction hole 30 of the separation block 20 described later, and is formed to have a length substantially extending across both ends of the separation block 20.

As can be better understood from FIG. 4, the separation block 20 of this embodiment is composed of a substantially rectangular parallelepiped upper block 21 and a lower block 25 which can be separated and combined with each other by bolts B1. Molding surface 2 whose surface facing inside cavity 12 forms part of side mold surface 13a
2, 26. Reference numeral 23 denotes holes formed at both ends of the upper block 21 for inserting the bolt B1,
27 is a lower block 25 for screwing with the bolt B1.
Screw holes formed at both ends of the screw. The lower block 25 is provided with a hole 28 for inserting a fixing bolt B2 into the recess 15 so as to match the screw hole 17 formed on the bottom surface of the recess 15.

The united surface 2 of the two blocks 21 and 25
In at least one of 1a and 25a (in this example, the combined surface 25a of the lower block), a suction groove 29 reaching the molding surface 26 is formed from an end opposite to the molding surface 26.
The suction groove 29 constitutes a skin suction hole 30 by combining the two blocks 21 and 25, and the two blocks 21 and 25 are formed.
5 is mounted in the concave portion 15 of the cavity mold 11, the horizontally long communication hole 16 having one end opened in the concave portion 15.
Through a pipe 35 via an external suction device (not shown).

It is preferable that a plurality of the suction grooves 29 are formed at predetermined intervals in order to obtain a large suction force.
The size of the suction groove 29 is appropriately determined depending on the relationship with the suction device.
m or less.

In the above embodiment, the suction groove 29 is provided only in the lower block 25.
Or on both blocks 21 and 25. Further, the separation block 20 may be composed of three or more blocks. In addition, the molding die 10 may be not only a closed injection type in which a foaming material is injected in a closed state, but also an open injection type in which a foaming material is injected in an open state and then closed.

The molding die 10 having the above structure is used for molding a foamed molded product with a skin as follows. First,
The separation block 20 is set in the recess 15 of the cavity mold 11. The lower block 25 is attached to the concave portion 15 of the cavity mold 11 with bolts B2, and then the upper block 2 is mounted on the lower block 25.
1 and are fixed to the lower block 25 with bolts B1.
Thereby, a skin suction hole 30 that opens on the mold surface 13a on the side of the cavity 12 is formed by the suction groove 26 on the united surface of the separation block 20. The skin suction hole 30 is connected to a suction device outside the mold via a pipe 35.

Next, as shown in FIG. 5, a skin 36 of a predetermined shape made of a vinyl chloride resin or the like is arranged on the mold surface 13 of the cavity 12. The skin 36 has a rising portion 36a at its edge bent toward the inner surface of the skin, and an edge portion 36b bent substantially inward from the tip of the rising portion 36a toward the inside of the skin. It is arranged on the mold surface 13 a on the side of the cavity 12 and closes the suction hole 30. Then, the rising portion 3 of the skin 36 is sucked through the suction hole 30 by the operation of the suction device.
6a is held by suction on the mold surface 13a on the side of the cavity.

On the other hand, as shown in FIG. 6, a core material 38 of a predetermined shape made of polypropylene or the like is arranged on the pressing die 18. The core material 38 has a recessed portion facing the skin 36, and the outer surface of the bent edge 36 b of the skin 36 is in close contact with the inner surface of the peripheral wall 39 a of the recess 39.

Subsequently, the molding die 10 is closed, and the raw material injection holes formed in the pressing die 18 and the injection holes (not shown) of the core material 38 formed corresponding thereto are formed. A foaming raw material 40 such as urethane is injected into the inner surface of the skin 36 in the cavity 12. Then, the foam 41 is formed by foaming, and the foam 41 and the skin 36 are bonded and integrated by the adhesiveness generated during the foaming. During this time, the rising portion 36a of the skin 36 is attracted to the mold surface 13a on the side of the cavity 12 by suction from the skin suction hole 30, and is properly held without falling. Thereafter, the suction is stopped, the mold is opened, and the molded product is taken out of the molding die 10, whereby a desired skin-integrated foam molded product is obtained.

In addition, due to regular maintenance and inspection, or deformation of the skin 36 or distortion of the core material 38, the rising portion 36a of the skin 36 is formed at the side of the cavity 12 during foaming. When the foaming material enters the skin suction hole 30 and clogs the skin suction hole 30 away from the mold surface 13a, the separation block 20 is moved to the cavity mold 1.
1, the suction groove 29 may be cleaned with the upper block 21 and the lower block 25 separated. At this time, unlike the hole whose outer periphery is closed, the side surface of the suction groove 29 is largely opened, so that cleaning can be performed easily and completely. In addition, since the suction groove 29 can be cleaned outside the mold, there is no difficulty in performing the cleaning as in the case of cleaning in the narrow cavity 12, and the suction groove 2 is disturbed by hand.
There is little damage to the area around 9.

FIG. 7 is a perspective view showing a main part of a cavity mold 43 of a molding die according to an embodiment of the present invention. In this embodiment, a single separation block 46 is detachably mounted in a concave portion 45 of a mold surface 44 of a cavity mold 43, and a suction groove is formed in a contact surface 46a of the separation block 46 with the concave portion 45. 47 are formed, and the suction groove 47 constitutes a skin suction hole. Reference numeral 45a denotes a horizontally long communication hole communicating with the suction groove 47 (skin suction hole) of the separation block 46 mounted on the recess 45, 45b denotes a screw hole for fixing the separation block formed on the bottom surface of the recess 45, and B3 denotes a separation block. A bolt for fixing 46 to the concave portion 45, a screw hole 46b formed in the separation block 46 for inserting the bolt B3, and a cavity 48 are provided.

In this molding die, the separation block 46
There is an advantage that the configuration is simplified. Moreover, since the suction groove 47 is formed on the separation block 46 side, the suction groove 47 is formed.
When cleaning is performed, the work may be performed on the separation block 46 side removed from the cavity mold 43, and the workability is excellent because the work is not hindered by the narrow cavity.

FIG. 8 is a perspective view showing a main part of a cavity mold 50 of a molding die according to another embodiment of the present invention. In this embodiment, in the concave portion 51 of the cavity mold 50, the concave portion 5 serving as the contact surface with the separation block 53 is provided.
A suction groove 52 is formed on one bottom surface, and the suction groove 52 constitutes a skin suction hole. Reference numeral 51a
Is a horizontally long communication hole communicating with the suction groove 52 (skin suction hole) of the concave portion 51, 51b is a screw hole for fixing the separation block formed on the bottom surface of the concave portion 51, and B4 is a bolt for fixing the separation block 53 to the concave portion 51. , 53a are screw holes formed in the separation block 53 for inserting the bolt B4.
Reference numeral 54 denotes a cavity, and 55 denotes a mold surface.

Even in this molding die, the separation block 53
Can be removed to clean the suction groove 52 (skin suction hole).
Easy to clean. In the invention of claim 2, the suction groove may be provided in both the separation block and the recess.

[0026]

As shown and described above, in the molding die for a foam molded article with a skin according to the present invention, a separation block is detachably mounted in a concave portion formed on the mold surface, and the separation block or the separation block is detached. Since the skin suction hole is formed by the suction groove formed on the inner surface of the concave portion that comes into contact with the block, when the suction groove is cleaned, the separation block can be removed very easily by removing the separation block from the cavity mold.
In addition, since the suction groove when the separation block is removed has a side surface open, the foam that has penetrated into the suction groove (skin suction hole) and has hardened can be completely removed from the suction groove. It is less likely that the peripheral surface of the skin suction hole is damaged by the pin or the like, as in the case where a pin or the like is inserted into the skin suction hole of the surface for cleaning.

In addition, even when the resin mold is inevitable depending on the shape of the cavity and the like, a metal block such as aluminum is used for the separation / separation block portion which requires strength for repeated attachment and detachment and cleaning of the suction groove. Therefore, the durability of the mold can be improved. Further, when a suction groove is formed on the separation block side, even if the separation block may be damaged by the repetition of the detachment and cleaning, etc., only the separation block needs to be replaced. It is a target.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a mold according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view showing a main part of the cavity mold with the separation block removed in the embodiment.

FIG. 4 is a perspective view showing a separation block in the embodiment.

FIG. 5 is a partial cross-sectional view showing a state where a skin is arranged on a mold surface in the embodiment.

FIG. 6 is a partial cross-sectional view of a molding die showing foam molding in the same example.

FIG. 7 is a perspective view showing a main part of a molding die according to an embodiment of the second invention.

FIG. 8 is a perspective view showing a main part of a molding die according to another embodiment.

FIG. 9 is a perspective view showing a main part of a conventional molding die.

FIG. 10 is a partial cross-sectional view showing a conventional foam molded article with a skin during molding.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Mold 11, 43, 50 Cavity mold 12, 48, 54 Cavity 13, 13 a, 44, 55 Mold surface 15, 45, 51 Concave 18 Press mold 20, 46, 53 Separation block 21 Upper block 21 a Combined surface of upper block Reference Signs List 25 lower block 25a united surface of lower block 29, 47, 52 suction groove 30 skin suction hole 36 skin 38 core material 40 foaming material

Claims (2)

[Claims] 1. A cavity for injecting a foaming material into an inner surface side of a skin to form a foam molded article with a skin in which the skin and the foam are integrated, and suctioning the skin into a mold surface of the cavity. In a molding die having a skin suction hole for holding, in a recess formed in the mold surface, a separation block in which a suction groove is formed in a combination surface of at least one block made of two or more blocks that can be separated and combined. Removably attached,
A molding die for a foam molded article with a skin, wherein a skin suction hole is formed by the suction groove. 2. A cavity for injecting a foaming raw material into an inner surface side of a skin to form a foam molded article with a skin in which the skin and the foam are integrated, and suctioning the skin into a mold surface of the cavity. In a molding die having a skin suction hole for holding, a separation block is removably mounted in a recess formed in the mold surface, and a suction groove formed in at least one of the surfaces of the recess and the separation block that abut each other. A molding die for a foam molded article with a skin, comprising the skin suction hole.