JP3761276B2 - Mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold that heats and softens a sheet-like skin made of thermoplastic plastic and press-molds it toward a convex molding part.
[0002]
[Prior art]
Conventionally, as this type, those disclosed in FIGS. 3 to 5 are known.
[0003]
FIG. 3 shows a molding die according to the prior art and a molding skin formed from the skin through the molding die.
[0004]
First, the molding die 2 will be described. The molding die 2 is formed by assembling the convex molding portion 2a and the base plate 2e above the trim wire 2d, which is a product portion, into one body. The mold 2 is provided with a large number of small holes 2 f at appropriate positions to serve as suction holes for the skin 1.
[0005]
And in order to shape | mold the skin 1 using such a shaping | molding die 2, the skin 1 is heated and softened, it presses against the shaping | molding die 2, and vacuum suction (It is good also as combined use of compressed air or compressed air, and vacuum.) Then, the skin 1 is formed so as to be in close contact with the molded portion 2a. Then, the molded skin 4 is obtained by cooling and retaining the mold.
[0006]
At the time of this molding, the corner 2b where the side surfaces of the convex molding portion 2a of the mold 2 intersect has a surplus on the skin 1 so that the surplus skin bridges from the corner top 2c to the base plate 2e. A molded skin 4 having an overlapping portion generally called a bridge 6 which is overlapped in a substantially triangular shape is formed.
[0007]
Foam molding performed by inserting the molding skin 4 into the foam mold 12, as shown in FIG. 4, injects an appropriate amount of foam 13 into the cavity mold 7 from the mixing head 11, and inserts the core mold 8 in the direction of arrow P. Clamp to the top. The foaming reaction proceeds immediately in the mold 12 that has been clamped, and the foaming mold 12 is filled while expanding. When this reaction is completed, the core material 9 and the molded skin 4 are integrally formed via the foam material 13.
[0008]
As shown in FIG. 5, the molding skin 4 is inserted into the foam molding die 12 by providing the cavity mold 7 with a recess 6 a having a bridge 6 shape and inserting the molding skin 4. In the inserted molded skin 4, a seal tape 5 is attached to the inner surface side of the bridge 6 (the back surface side of the molded skin).
[0009]
Further, a sealing material 10 that circulates on the core material 9 is provided, and when the mold is clamped, the sealing material 10 is in side contact with the sealing tape 5 so that there is no gap through which the foam material 13 leaks and foam molding is performed.
[0010]
[Problems to be solved by the invention]
However, in the mold 2 described above, the skin of the bridge 6 formed at the corner 2b at the time of molding is in a state where there is a gap that is not fused while being removed from the guide plate 23. Since 13 invades and leaks, there is a problem that it is necessary to apply the sealing tape 5 by man-hours so that the foam 13 does not enter.
[0011]
SUMMARY OF THE INVENTION In order to solve the above-described problems of the prior art, an object of the present invention is to provide a skin mold in which the application of a sealing tape for leakage prevention of foam material can be omitted.
[0012]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a sheet-like skin made of a thermoplastic is heated and softened and pressed toward the convex molding part along the molding part. In a mold that molds to the outer skin,
A guide plate for induction-molding a part of the surplus skin of the outer skin is provided at the corner of the molded portion, and the guide plate extends from the position of the trim line indicating the product end below the top of the corner of the molded portion. It is provided to induce the epidermis.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0014]
FIG. 1 is an explanatory view showing a molding die according to the present embodiment and a state in which a molding skin is formed from the skin through the molding die.
[0015]
In FIG. 1, 1 is a sheet-shaped skin, 22 is a molding die, 2a is a convex molding portion of the molding die 22, 2b is a corner portion where the side surfaces of the molding portion 2a intersect, and 2c is a corner portion of the corner portion 2b. The top part, 2d is a trim wire indicating the product end of the molding part 2a, 2e is a base plate of the molding die 22, 2f is a small hole for suction, and 23 is provided along the corner part 2b where the side surfaces intersect. Reference numeral 24 denotes a substantially trapezoidal guide plate having an area. Reference numeral 24 denotes a molded skin formed through a molding die 22.
[0016]
FIG. 2 is an explanatory view showing a state where the molding skin according to the embodiment is inserted into a foaming mold and foaming is performed.
[0017]
In FIG. 2, reference numeral 12 </ b> A denotes a foam molding die including a core die 8 and a cavity die 27, and a molding skin 24 is inserted into the cavity die 27. And 27a is inserting the bridge 26 in a hollow part.
[0018]
Further, in this bridge 26, the portion located on the guide plate 23 has a gap but the portion where the guide plate 24 is omitted is fused with the inner surface of the molding skin 24 that is heat-softened during molding. A skin fusion part 26a is formed as a skin, and the gap disappears.
[0019]
Therefore, as shown in the perspective view of FIG. 2, the bridge portion 26 inserted into the recess portion 27 a is attached to the sealing tape 5 as in the conventional case because the notch portion 23 a of the guide plate 23 is fused. There is no need to stick. When the core mold 8 is clamped to the bridge portion 26 that is not fused, the sealing material 10 is in contact with the bridge portion 26 to close the gap between the molding skins 24, thereby preventing the foam material 13 from entering and leaking the foam material 13. The structure can be prevented.
[0020]
The skin molding performed using the molding die 22 configured as described above and the foam molding performed using the molding skin will be described.
[0021]
First, the formation of the molding skin 24 will be described with reference to FIG. 1. The molding die 22 presses the heated and softened skin 1 against the molding portion 2a, and simultaneously sucks it from the small hole 2f to the molding die 22. Adsorb. Subsequently, the molded skin 24 is obtained by removing the mold when the shape can be cooled and retained. At this time, the surplus skin is always formed in the same shape at the same position in a bridge shape via the guide plate 23.
[0022]
In addition, the guide plate 23 is provided on a substantially trapezoidal thin plate from which the side plate intersects the corner 2b to the base plate 2e and from the corner top 2c to the vicinity of the product trim line 2d. When the excessive epidermis is guided and attracted so as to be pulled, a small bridge shape is generated in the cut-out portion 23a, and the heated and softened epidermis 1 is overlapped and fused so as to be engaged. Therefore, the cutout portion 23a of the guide plate 23 can obtain the skin fusion portion 26a that is fused so that there is no gap.
[0023]
Next, foam molding using the molding skin 24 will be described.
[0024]
FIG. 2 shows a state in which the molding skin 24 is inserted and the foam material 13 is injected. In inserting the molding skin 24, the bridge 26 is inserted into the recess 27 a provided in the groove shape in the cavity mold 26, and the entire molding skin 24 is inserted while being expanded in the foam molding die 12.
[0025]
Further, from the mixing head 11, two liquids of the liquid A and the liquid B, which are the foam material 13, are injected into the molding skin 24 mounted in the cavity mold 27 while stirring in the mixing head 11.
[0026]
Immediately after that, the core material 9 is detachably attached, and the core die 6 provided with the sealing material 10 joined to the periphery of the attached core material 9 is lowered in the direction of the arrow Y to perform clamping.
[0027]
The foam material 13 injected into the foam mold 12A rapidly reacts and expands to fill the foam mold 12A. At this time, the foaming pressure of the foaming material 13 is applied in the foaming mold 12A, but the gap is closed by the sealing material 10 where the bridge 26 is fused and not fused, and the sealing tape 5 is used. Foam molding without any problems. Then, when the reaction of the foam material 13 is completed, the mold is removed from the foam mold 11 </ b> A, and a resin molded product in which the core material 9 and the molded skin 24 are integrated with the foam material 13 is formed.
[0028]
Here, the skin 1 is a sheet material made of a resin material blended with ABS resin and vinyl chloride by an extrusion molding machine or a calender roll device, and the surface side is roll-transferred with a wrinkle pattern to improve the appearance quality. Is often used. A skin thickness of 0.7 mm or 0.8 mm is generally used as a vehicle interior material.
[0029]
Here, the foam material 13 refers to a urethane foam material, and the polyol as the A liquid and the isocyanate as the B liquid are mixed and stirred by the mixing head 11 to form a foam layer along the in-mold shape. I will let you go. These two liquids have the property of reacting violently in a very short time, flowing and expanding at high speed, and entering a narrow gap.
[0030]
Here, the sealing material 10 generally refers to a urethane foam molding material sliced into a string having a cross-section such as a circle or a square. This sealing material 10 is soft in a foamed state and can be easily joined along the uneven surface of the molded product. Further, when the pressure of the foam 13 is received, the foam 13 can be prevented from leaking by deforming in the pushed direction and filling the gap.
[0031]
【The invention's effect】
As has been described, according to the first aspect of the invention, a guide plate for guiding molding a portion of the remainder epidermis of the skin at the corners of the molding part is provided, and the guiding plate corners of the molding section The remainder skin is provided so as to be guided from the position of the trim line indicating the end of the product below the top.
[0032]
Therefore, the surplus skin is formed along the guide plate so as to be pulled, thereby forming a bridge having a certain stable shape. Further, by using this skin, it is possible to accurately insert into the foaming mold, so that molding defects can be reduced.
[0033]
Furthermore, the surplus skin between the corner of the molded part and the guide plate is fused to form a single sheet with no gap, and it is not necessary to affix the sealing tape to prevent the foam from leaking.
[0034]
Therefore, a sealing tape is not required, and an affixing operation is not required, so that the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing skin molding according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing foam molding using a molding skin according to the embodiment.
FIG. 3 is an explanatory view showing a conventional skin molding.
FIG. 4 is a sectional view showing foam molding using a molding skin according to the prior art.
FIG. 5 is a perspective view of a Q portion according to FIG. 4;
[Explanation of symbols]
22 ... Mold 23 ... Guide plate 1 ... Skin 2a ... Molding part 2b ... Corner 2c ... Corner top

Claims (1)

In a mold that molds the skin along the molding part by pressurizing it toward the convex molding part in a state where the sheet-like skin made of thermoplastic is heated and softened,
A guide plate for induction-molding a part of the surplus skin of the outer skin is provided at the corner of the molded portion, and the guide plate extends from the position of the trim line indicating the product end below the top of the corner of the molded portion. A mold characterized by being provided so as to induce an epidermis.

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