JP2002254459A - Method and apparatus for supporting skin in press molding of laminated molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for supporting a skin which can set the skin simply and inexpensively in a short time and improve the moldability of the skin when a resin core material and the skin are molded integrally by using a press molding method and an apparatus for supporting the skin. SOLUTION: Set pins 70a and 70b are arranged in an upper mold 30 for mold press molding. As for a lower mold 40 for mold press molding, a round hole 82 for engaging the fixed side set pin 70b with a set plate 80 corresponding to the fixed side set pin 70b is formed. As regards the set plate 80a corresponding to the movable side set pin 70a, a slot hole 83 is formed in the slide direction of the movable side set pin 70a so that the movable side set pin 70a is slid along the slot hole 83 of the set plate 80 corresponding to tension applied to the skin 12 to apply proper tension to the skin 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press molding of a laminated molded article in which a skin is integrally adhered to a surface of a resin core material. TECHNICAL FIELD The present invention relates to a method and an apparatus for supporting a skin in press molding of a laminated molded article capable of inexpensively molding a laminated molded article having excellent external appearance performance.

[0002]

2. Description of the Related Art FIG. 13 shows a structure of an automobile door trim 1 provided inside a door panel on the indoor side. The automobile door trim 1 is formed into a desired curved shape, and has an appropriate shape retention and a suitable shape. A skin 3 rich in feel and design is integrally adhered to the surface of the resin core material 2 having the mounting rigidity described above, and the peripheral end of the skin 3 is wound around the entire length of the product periphery, or a part thereof, as a pad. The resin core material 2 is wound around the back side and trimmed.

As a method of manufacturing the door trim 1 for an automobile, mold press molding, cold press molding and the like are frequently used because the door trim 1 is a mass-produced part, and the mold press molding method will be described as an example. First, as shown in FIG. 14, a conventional mold press forming apparatus 4 used in the mold press forming method includes a mold press forming upper die 5 capable of moving up and down by a predetermined stroke, and a fixed side mold press located thereunder. The resin core 2 is connected to the lower mold 6 for molding and the lower mold 6 for mold press molding.
And an injection molding machine 7 for supplying a molten resin M as a raw material. Further, a skin conveyor 8 for feeding the skin 3 into the molds 5 and 6 is provided so as to be able to move forward and backward.

As a structure for supporting the outer skin 3 on the upper mold 5 for mold press molding, set pins 5a are provided along the periphery of the lower surface of the upper mold 5, and some of the set pins 5a are provided.
b is configured to be urged outward by a spring 5c and slid in the direction of the arrow in FIG.

[0005] First, as shown in the figure, the skin carrier 8 is loaded into the upper and lower dies 5, 6 in the mold open state, and the skin 3 is held by the set pins 5 a, 5 b of the upper mold 5.

Next, as shown in FIG. 15, when the upper die 5 for mold press molding descends by a predetermined stroke and the clearance between the upper and lower dies 5 and 6 reaches 1 to 30 mm, the molten metal is injected from the injection molding machine 7. The resin M is the manifold 6a,
It is distributed and supplied onto the mold surface of the lower mold 6 through the gate 6b.

At this time, tension is applied to the skin 3 by the lowering operation of the upper mold 5 for mold press molding, but the set pin 5b on the movable side slides due to the compression deformation of the spring 5c, and the skin 3 is moved into the mold. Be drawn in.

Next, as shown in FIG. 16, the upper mold 5 for mold press molding is moved down to the bottom dead center, and the upper and lower molds 5 and 6 for mold press molding are clamped.
Is molded into a required shape, and the skin 3 is integrated with the surface of the resin core material 2 to complete the mold press molding. Finally, as shown in FIG. 17, the upper mold 5 for mold press molding is raised, and the door trim 1 formed into a required shape may be removed.

[0009]

As described above, as a method of forming the door trim 1 composed of the laminated molded body of the resin core material 2 and the skin 3 by using the mold press molding method, the skin 3 is formed in the mold. When setting the skin, the skin transporter 8 is required, and the forward and backward movement of the skin transporter 8 must be performed accurately, which increases the equipment cost, lengthens the setting process of the skin 3, and prolongs the molding cycle. It has been pointed out that the drawback is to make it work.

Further, the periphery of the skin 3 is set with a set pin 5a,
5b, the outer peripheral portion tends to hang down between the set pins 5a due to the weight of the outer skin 3, and the outer peripheral portion of the outer skin 3 is likely to meander, thereby deteriorating the external appearance at the peripheral end portion of the product. And the epidermis 3
It is pointed out at the same time that when the wire is disengaged from the set pins 5a and 5b, defective molding such as wrinkles and looseness occurs at the peripheral edge.

The present invention has been made in view of such circumstances, and in press molding of a laminated molded body obtained by integrating a resin core material and a skin, equipment for setting the skin is simple and inexpensive. In addition, the present invention provides a method and an apparatus for supporting a skin in press-forming a laminated molded body, which can shorten the molding cycle by performing the setting operation of the skin in a short time, and can also improve the appearance of the peripheral portion. The purpose is to:

[0012]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 of the present application relates to a method in which an upper skin is integrally adhered to the surface of a resin core material by clamping the upper and lower dies for press molding. In the method for supporting the skin in the press molding of the laminated molded body, the flat skin is set so that the peripheral portion is located on a set plate provided on the outer periphery of the core portion of the lower die for press molding, With the lowering of the upper die for press molding, the set pins provided on the lower surface of the peripheral portion of the upper die penetrate the skin placed on the set plate, and are supported by the set pins and the set plate from above and below the skin. At the same time, at the time of press molding, at least some of the set pins are slid on the set plate in a direction approaching the core portion by tension applied to the skin to support the skin. To.

Further, the invention according to claim 2 of the present application is directed to a method of press-forming a laminated molded article in which a skin is integrally adhered to the surface of a resin core material by clamping the upper and lower dies for press molding. In the supporting device, a set plate disposed along the outer periphery of the core portion of the lower die for press molding and supporting the peripheral edge of the skin, a supporting member for vertically supporting the set plate, and an upper die for press molding The set plate includes a movable side and a fixed side set pin, and a round hole corresponding to the fixed side set pin is provided in the set plate. A long hole is provided along the sliding direction of the movable set pin.

Here, as a support mechanism of the set plate, a plurality of support shafts for supporting the set plate are inserted into the lower mold, and the set plate is moved up and down by cylinder driving in conjunction with the operation of the upper mold. Also, the spring may always be urged upward by the urging spring, and may be lowered in response to the spring force of the urging spring in connection with the lowering operation of the upper die. In this case, the ball plunger mechanism or the like may be used. It is preferable that the support shaft is vertically movably supported by a ratchet mechanism or the like.

According to the present invention, when the skin is set in the press mold, the set plate provided on the outer periphery of the core portion of the lower mold for press molding is laid flat so that the periphery of the skin is held. Therefore, a conventional expensive skin transporter can be eliminated, and the skin setting operation can be performed easily and in a short time.

Further, at the time of press molding, the periphery of the skin is supported by the set pin and the set plate from above and below the skin by the set pin of the upper die biting while being placed on the set plate. The peripheral portion of the set plate does not meander due to its own weight, and the set plate has a long hole extending along the movable direction of the set pin with respect to the movable set pin. When the set pin slides in the elongated hole according to the applied tension, an appropriate amount of the skin is drawn into the mold, and an appropriate tension is applied to the skin, so that molding defects such as wrinkles and looseness do not occur.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments in which a method and apparatus for supporting a skin in press molding according to the present invention are applied to a mold press molding method will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 are a front view and a sectional view showing an automobile door trim as an example of a laminated molded product. FIGS. 3 to 5 show an example of a molding device for a laminated molded product.
4 is an overall view, FIG. 4 is a plan view of a lower die, and FIG. 5 is a perspective view of a main part of a set plate in the lower die. 6 is a timing chart of a press upper die in the mold press molding of the laminated molded body, FIG. 7 is an explanatory diagram of a skin setting process, FIG. 8 is an explanatory diagram of a molten resin injection process, and FIGS. 9 and 10 are mold presses. FIG. 11 is an explanatory view showing a form of supporting the skin during molding, FIG. 11 is an explanatory view of a mold press molding step, and FIG.

First, the structure of the door trim for an automobile will be described with reference to FIGS. 1 and 2. The door trim for an automobile 10 is formed on the surface of a resin core material 11 having a suitable shape retention and rigidity for mounting to a door panel. It is configured by adhering a skin 12 having an excellent touch and appearance, and as a material of the resin core material 11, PP resin (polypropylene resin) mixed with talc is formed into a desired curved surface shape by mold press molding. The skin 12 integrated when the resin core material 11 is subjected to mold press molding is made of a synthetic resin sheet such as TPE (thermoplastic elastomer), a laminated sheet material in which a cushion layer such as polyethylene foam is lined on the back surface of TPE, or a nonwoven fabric Are preferred.

By the way, the present invention can be effectively used for a laminated molded article or the like in which the skin 12 is integrated with the surface of the resin core material 11, so that the setting work of the skin 12 can be performed easily and at low cost, and wrinkles, looseness, etc. It is an object of the present invention to provide a method and a device for supporting the skin 12, which can prevent molding defects as much as possible, and can maintain beautiful appearance performance without meandering at the periphery.

The structure of the molding apparatus 20 to which the present invention is applied will be described with reference to FIGS. 3 to 5. FIG. 3 is an overall view of the molding apparatus 20. The mold press molding apparatus 20 is capable of moving up and down by a predetermined stroke. Upper mold 30 for mold press molding
And a lower mold press molding die 40 corresponding to the lower side, and a lower mold press molding die 40 on the fixed side.
And an injection molding machine 50 for supplying the molten resin.

More specifically, the upper mold 30 for mold press molding is moved up and down by the lifting cylinder 31 as shown in the timing chart of FIG. That is,
The upper mold press molding die 30 descends until it stops at the molten resin injection point, and after a predetermined period of time, the upper mold press molding upper mold 30 continues to descend to the bottom dead center, and rises to the uppermost position after molding. I do.

On the other hand, the lower mold 40 for mold press molding is
A resin passage for the molten resin supplied from the injection molding machine 50 is formed inside the resin passage.
And a plurality of gates 42 branching therefrom. The molten resin is distributed and supplied onto the mold surface of the lower mold 40 for mold press molding through the manifold 41 and the plurality of gates 42. The injection molding machine 50 is a general-purpose in-line screw type.

Next, the epidermis 12 which is a characteristic part of the present invention.
The support mechanism 60 will be described. The upper die 30 for mold press molding has a set pin 70 (movable side set pin 7).
0a, fixed-side set pins 70b), and a set plate 80 is provided on the lower mold 40 for mold press molding.

More specifically, as for the set pin 70, a movable set pin 70a is provided along one side corresponding to the upper edge of the door trim 10, and a support plate provided with the movable set pin 70a is provided. The support plate 71 is slidably inserted into and supported by the guide shaft 72, and the support plate 71 is always urged outward by an urging spring 73, and the stopper 74 stops the support plate 71 at its outermost position. Is provided at the tip of the guide shaft 72.

Therefore, the support plate 71 can slide toward the center of the mold, and the biasing spring 73
Is located at the outermost position. The remaining three sides other than the side on which the movable side set pin 70a is provided have fixed side set pins 70b fixed to the lower surface of the upper mold 30 for mold press molding.

On the other hand, for the lower mold 40 for mold press molding, a set plate 80 is provided on each of the four sides of the outer periphery of the core portion 40a, and the set plate 80 is supported by a support shaft 81 so as to be vertically movable. I have.

When the upper die 30 for mold press molding is lowered by the operation of the cylinder 31 for elevating and lowering, the support shaft 81 is lowered following the lowering of the upper die 30 for mold press molding, and is appropriately held at the descent point. In order to provide functions, a ratchet mechanism, a ball plunger mechanism, and the like are preferably provided inside the lower mold 40. Although not shown, the support shaft 81 is always urged upward by the spring pressure of the coil spring.

The set plate 80 has a round hole 82 through which the fixed set pin 70b penetrates the set pin 70b, while the movable set pin 70a has a round hole 82 as shown in FIG. The corresponding set plate 80a is provided with a long hole 83 extending along the sliding direction of the movable set pin 70a.

Next, the steps of molding the automobile door trim 10 using the above-described mold press molding apparatus 20 will be sequentially described. First, the point A in the time chart shown in FIG. When the mold 40 is in the mold open state, the skin 12 is first set in the mold.

FIG. 7 shows the setting operation of the skin 12.
As shown in the figure, the skin 12 only needs to be laid flat on the mold surface of the lower mold 40 for mold press molding, and the conventional expensive skin conveyor is abolished. Since it can be easily performed manually, it is advantageous in terms of work time.

When the setting operation of the skin 12 is completed, the upper mold 30 for mold press molding descends to the point B in the time chart of FIG. 6, and then to the point C in the time chart as shown in FIG. The molten resin M is distributed and supplied from the injection molding machine 50 to the mold surface of the lower mold 40 for mold press molding through the manifold 41 and the gate 42.

At this time, the upper mold 30 for mold press molding is used.
Is lowered, the outer periphery of the skin 12 is supported on the set plate 80, and the set pins 70 are inserted into the round holes 82 and the long holes 83 of the set plate 80. Is securely held from the upper and lower sides, the skin 12 does not come off from the set pin 70 due to the tension at the time of molding, and in the present invention, in particular, in the present invention, as shown in FIGS.
9A, the inside of the long hole 83 formed in the set plate 80a according to the tension applied to the skin 12 is shown in FIG.
Since the outer skin 12 can be slid in the direction of the middle arrow, the outer skin 12 can be reliably held, and the outer skin 12 can always be given an appropriate tension by moving according to the tension applied to the outer skin 12.

The upper mold 30 for mold press molding descends to the point D in the time chart of FIG. 6 and moves from the point D to the point E, as shown in FIG. , 40 mold clamping is performed,
Thereafter, the upper mold 30 for mold press molding is moved up from the point E to the point F in the time chart, and as shown in FIG. 12, after the mold is opened, the door trim 10 may be removed from the mold.

As described above, at the time of the mold press molding, the peripheral portion of the skin 12 has a flat set plate 8.
0, and the set pin 70 is inserted into the round hole 82 and the long hole 83 of the set plate 80, so that the peripheral portion of the skin 12 is securely held from above and below, and the conventional meandering or the like can be performed. In addition, since the movable set pin 70a slides in the long hole 83 of the set plate 80a, an appropriate tension can always be applied to the skin 12, so that molding defects such as wrinkles and looseness can be reliably prevented. The moldability can be greatly improved.

In the embodiment described above, the movable set pin 70a is provided only on one side along the waist of the door trim 10. However, when the present invention is applied to the molding surface of the door trim 10 or interior parts for other uses. In this case, the movable set pin 70a may be installed all around or on a plurality of sides. In such a case, the moldability is further improved.

Also, instead of the mold press molding method,
It can also be applied to the cold press molding method, in which case, after placing the heat-softened core material on the lower mold for press molding, the skin can be laid flat on the set plate, making the setting work easy Therefore, the same operational effects as in the mold press molding method, in which the moldability can be improved, can be expected.

[0038]

As described above, according to the method and the apparatus for supporting the skin in the press molding of the laminated molded body according to the present invention, the operation of setting the skin in the press mold can be performed easily and in a short time. Since the conventional expensive skin transporter can be eliminated, the setting workability can be improved, the molding cycle time can be shortened, and the molding equipment can be reduced.

Further, during press molding of the resin core material and the skin, the peripheral portion of the skin is held by the set pins on the flat set plate, so that the peripheral portion of the skin does not meander. Molding defects such as wrinkles and looseness due to detachment from the set pins can be reliably prevented.

In addition, since the movable set pin slides in the long hole of the set plate, the tension applied to the skin can be always properly maintained at the time of molding, so that not only the molding performance can be improved but also the deep drawing portion can be improved. This has the effect of greatly improving the degree of freedom in shaping the product, such as setting, and improving the degree of freedom in the material, such as the use of an inexpensive skin material having low elongation characteristics.

[Brief description of the drawings]

FIG. 1 is a front view showing an automobile door trim manufactured using the method of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an overall view of a mold press molding apparatus employing a skin support mechanism according to the present invention.

4 is a plan view of a lower mold for mold press molding in the mold press molding apparatus shown in FIG.

5 is a perspective view showing a main part of a set plate in the lower mold for mold press molding shown in FIG. 4;

FIG. 6 is a time chart of an upper mold in the mold press molding apparatus shown in FIG. 3;

FIG. 7 is an explanatory view showing a step of setting a skin in a door trim molding method using the mold press molding apparatus shown in FIG. 3;

FIG. 8 is an explanatory view showing a molten resin supply step in a door trim molding method using the mold press molding apparatus shown in FIG. 3;

9 is a cross-sectional view showing a form of supporting a skin in mold press molding of a door trim using the mold press molding apparatus shown in FIG.

FIG. 10 is an explanatory view showing a form of supporting a skin in mold press molding of a door trim using the mold press molding apparatus shown in FIG. 3;

FIG. 11 is an explanatory view showing a mold press molding step in a door trim molding method using the mold press molding apparatus shown in FIG. 3;

FIG. 12 is an explanatory view showing a state in which the mold is removed after a mold press molding step is completed.

FIG. 13 is a cross-sectional view showing a configuration of a conventional automobile door trim.

FIG. 14 is an explanatory view showing a skin setting step in a conventional door trim mold press molding method.

FIG. 15 is an explanatory view showing a supply step of a molten resin in a conventional door trim mold press molding method.

FIG. 16 is an explanatory view showing a mold press molding step in a conventional door trim mold press molding method.

FIG. 17 is an explanatory view showing a mold opening state after molding in a conventional door trim mold press molding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Automobile door trim 11 Resin core material 12 Skin 20 Mold press molding apparatus 30 Mold press molding upper die 31 Lifting cylinder 40 Mold press molding lower die 41 Manifold 42 Gate 50 Injection molding machine 60 Skin support mechanism 70 Set pin 70a Movable Side set pin 70b Fixed side set pin 71 Support plate 72 Guide shaft 73 Urging spring 74 Stopper part 80, 80a Set plate 81 Support shaft 82 Round hole 83 Slot M Melted resin

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masahiko Hara 3316 Miyayama, Samukawa-cho, Koza-gun, Kanagawa Prefecture F-term (reference) 3D023 BA01 BB08 BD03 BE05 BE31 4F204 AD05 AD08 AD16 AG03 AH23 FA01 FB01 FB12 FJ14 FQ40

Claims (2)

[Claims] 1. A support for a skin in press forming of a laminated molded body in which a skin (12) is integrally adhered to a surface of a resin core material (11) by clamping the upper and lower dies for press molding (30, 40). In the method, the outer skin (12) is placed flat on a set plate (80) provided on the outer periphery of the core part (40a) of the lower die (40) for press molding, and the press is set. With the lowering of the upper mold (30), the set pin (70) provided on the lower surface of the periphery of the upper mold (30) is lowered.
a, 70b) penetrate the epidermis (12) placed on the set plate (80), and the set pins (70a, 70b) and the set plate (8) from above and below the epidermis (12).
0) and at the time of press molding, the skin (1)
At least some of the set pins (70 a) slide on the set plate (80 a) in a direction approaching the core part (40 a) due to the tension applied to the epidermis (1).
2. A method for supporting a skin in press molding of a laminated molded article, wherein the method comprises supporting 2). 2. Support of the skin in press forming of a laminated molded body in which a skin (12) is integrally adhered to the surface of a resin core material (11) by clamping the upper and lower dies for press molding (30, 40). In the apparatus, a set plate (80) that is disposed along the outer periphery of the core portion (40a) of the lower die for press molding (40) and supports the peripheral portion of the skin (12); It comprises a supporting member (81) movably supported, and movable and fixed set pins (70) provided on the upper die (30) for press molding.
The round hole (82) corresponding to b) is the set plate (80)
And the movable set pin (70
A long press hole (83) is provided in the set plate (80a) along the sliding direction of the movable set pin (70a) so that the slide plate (a) can slide in the mold center direction. Epidermis support device.