JPH06238695A - Molding equipment for laminate molded form - Google Patents

Abstract

PURPOSE:To improve the moldability of a skin material while reliably preventing defective appearance such as the creases, sags, etc., of the skin material after molding in a molding equipment for a laminate molded form in which a resin core material and the skin material are molded integrally in a mold for mold press molding. CONSTITUTION:At least parts of support pins 62, 66 set on the periphery of a top force 40, to which a skin material is set, are installed to a movable type support frame 61, thus moving the support pins 62 in response to tension applied to the skin material at the time of mold press molding, then moving the skin material according to a complicate curved surface shape while maintaining tension to the skin material approximately uniformly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus used for molding a laminated molded article suitable for automobile interior parts such as automobile door trims.

[0002]

2. Description of the Related Art Conventionally, the structure of automobile interior parts such as automobile door trims and rear corner trims that are installed in the body panel of automobiles will be described with reference to the automobile door trim shown in FIG. Is
Resin core material 2 molded to have a desired curved surface shape
And a skin-molded body that is integrally laminated on the surface side of the resin core material 2 and has a cushioning property.

As a method of molding the resin core material 2,
Recently, since a complicated three-dimensional shape is required for molding, a mold press molding method having excellent moldability tends to be used frequently.

In this case, the skin material 3 is integrated with the resin core material 2 at the time of mold press molding of the resin core material 2 for the purpose of shortening the process.

That is, as shown in FIG. 11, first, the set pin 4a of the upper die 4 for mold press molding is attached to the skin material 3.
Is set in advance, and the upper mold 4 for mold press molding is lowered to maintain a predetermined clearance between the upper and lower molds 4 and 5 on the mold surface of the lower mold 5 for mold press molding.
The resin material 7 distributed and supplied from the injection molding machine 6 through the hot runner 5a and the plurality of gates 5b branched from the hot runner 5a is press-molded into a desired shape by engaging and pressing the upper and lower molds 4 and 5. The resin core material 2 is molded by using the resin core material 2 and the skin material 3 is formed on the surface side of the resin core material 2.
The vehicle door trim 1 shown in FIG.

[0006]

However, according to the conventional method of integrally press-molding the resin core material 2 and the skin material 3 by mold press molding to form a laminated molded article, the skin material is not pressed during the mold press molding. It has been pointed out that No. 3 cannot follow the highly expanded shape, the skin is broken, the resin exudes from the cut portion, and molding defects frequently occur.

As a countermeasure against this, if the end of the skin material 3 is removed from the set pin 4a during the molding so that the skin material 3 conforms to the highly expanded shape, the set pin 4a becomes unbalanced due to uneven tension applied to the skin material 3. There was a problem that wrinkles were generated in the skin material 3 around the part removed from the.

The present invention has been made in view of the above circumstances, and an object of the present invention is to form a laminated molded article in which a resin core material and a skin material are integrated by a mold press molding method. To provide a molding apparatus capable of molding a laminated molded article having a good design property by improving the moldability of the skin material and reliably preventing wrinkles, unevenness, etc. from occurring on the skin material after molding. is there.

[0009]

In order to achieve the above-mentioned object, the present invention is to form a resin core material by mold press-molding a molten resin into a required shape, and at the time of mold press-molding the resin core material, In a molding apparatus for a laminated molded body, which is obtained by integrating a resin core material and a skin material, the molding apparatus comprises:
Mold press molding lower mold having a desired mold surface to which molten resin is distributed and supplied, mold press molding upper mold having a desired mold surface shape and engageable with the lower mold, and mold surface of the upper mold In order to hold the skin material, a support pin installed on the periphery of the upper mold is provided, and at least one side support pin is movable according to the tension from the skin material.

[0010]

As apparent from the above construction, since at least a part of the support pin for holding the end of the skin material is constructed so that it can be moved along the complicated curved surface shape of the mold during mold press molding. The skin material easily follows.

Further, since the support pin moves in accordance with the tension applied to the skin material during the mold press molding, the tension applied to the skin material becomes substantially uniform.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A molding apparatus for laminated moldings according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an external view showing an automobile door trim manufactured by using the apparatus according to the present invention, FIG. 2 is a sectional view showing the structure of the automobile door trim, and FIG. 3 is a first molding apparatus according to the present invention. 4 to 8 are sectional views showing respective steps of manufacturing a door trim by using the molding apparatus shown in FIG. 3, and FIG. 9 is a second embodiment of the molding apparatus according to the present invention. FIG. 3 is a cross-sectional view of main parts showing the configuration of FIG.

1 and 2, an automobile door trim 10 is generally composed of a resin core material 11 formed into a required shape and a skin material 12 laminated and integrated on the surface side of the resin core material 11. ing.

More specifically, the resin core material 11 is made of polypropylene resin mixed with talc, and is distributed and supplied in a molten state into a mold for press molding having a required curved surface shape, and then is subjected to mold press molding. It is molded into a shape with a complicated curved surface shape.

The top layer 1 is used as the skin material 12.
A laminated sheet composed of 2a, a foam layer 12b and a base cloth 12c is used, a PVC sheet is used as the top layer 12a, a polyethylene foam is used as the foam layer 12b, and a polyester fiber non-woven fabric is used as the base cloth 12c. And a good surface appearance due to the top layer 12a,
The foam layer 12b has good cushioning properties, and has a function of preventing the molten resin from seeping into the foam layer 12b during mold press molding of the resin core material 11 with the base fabric 12c.

Next, the structure of the molding apparatus for molding and press-molding the above-mentioned automobile door trim 10 will be described.

As shown in FIG. 3, the molding apparatus 20 is
A lower mold 30 for mold press molding having a desired mold surface,
An upper die 40 for mold press molding which is located above the lower die 30 and has substantially the same die surface, and a melt which is connected to the lower die 30 and which is the material of the resin core material 11 on the die surface of the lower die 30. A material supply mechanism 50 for supplying a resin and a skin material support mechanism 60 for holding the skin material 12 installed on the upper mold 40 with a uniform tension are generally configured.

More specifically, as the material supply mechanism 50, an injection molding machine 51 is connected to the lower mold 30 and installed.
From the nozzle of the injection molding machine 51, the molten resin is distributed and supplied to predetermined locations on the die surface of the lower die 30 through the hot runner 31 and the plurality of gates 32 formed in the lower die 30.

Next, the upper mold 4 located above the lower mold 30.
0 is configured to be vertically movable by a lifting cylinder 41, and a support mechanism 60 for the skin material 12 is installed along the peripheral edge of the upper mold 40.

A movable support mechanism is used on at least one side of the support mechanism 60.

That is, a support frame 61 having an L-shaped cross section
And a support pin 62 for piercing the skin material 12 installed at predetermined intervals along the end of the support frame 61, and a through hole 63a provided in a flange 63 of the support frame 61, fixed to the side surface of the upper mold 40. By inserting the support rod 64 and winding the spring 65 around the support rod 64, the support frame 61 can be moved in the arrow direction in FIG.

In this embodiment, the movable support pins 62 are used on one side, and the fixed support pins 66 are used on the mold surface of the upper mold 40 for the remaining three sides of the upper mold 40. ing.

A molding press molding process of the automobile door trim 10 using the above-described molding apparatus 20 will be described.

First, as shown in FIG. 4, the skin material 12 is set on the upper mold 40 with the base cloth 12c facing downward.

Then, the upper die 40 is lowered by the operation of the lifting cylinder 41, and when the clearance between the upper and lower dies 30, 40 is about 30 mm, the lowering operation of the upper die 40 is stopped, and
As shown in FIG. 3, the molten resin M is passed through the nozzle of the injection molding machine 51 and the lower mold 30 through the hot runner 31 and the gate 32.
It is distributed and supplied to a predetermined position on the mold surface.

Thereafter, the upper die 40 descends again, and as shown in FIG. 6, the resin core material 11 is molded by the engagement pressure tightening of the upper and lower mold press molding dies 30, 40, and
The skin material 12 is integrated with the surface side of the resin core material 11.

At this time, the skin material 12 is made up of the upper and lower molds 30 and 4.
Although tension is applied so as to adjust to the mold surface shape of 0, the movable support mechanism 60 moves the support frame 61 to the left in the figure as shown in FIG. Can be used without any further, and on the epidermis side 1
Unreasonable tension is not applied to 2.

When the mold press molding process is completed, the upper mold 40 is raised, and the lower side of the door trim 10 is ejected in the direction of arrow A by the eject mechanism (not shown) installed in the lower mold 30, and then arrow B. After removing the door trim 10 from the lower mold 30 in the direction, the peripheral edge portion of the skin material 12 is wound around the back surface side of the resin core material 11,
The manufacture of the automobile door trim 10 shown in FIGS. 1 and 2 is completed.

As described above, when the molding apparatus 20 according to the present invention is used, the support frame 6 of the support mechanism 60 is adjusted in accordance with the tension applied to the skin material 12 during mold press molding.
1 is movable with respect to the spring pressure of the spring 65, and even if the upper and lower molds 30 and 40 for mold press molding have complicated curved surface shapes, the skin material 12 easily follows the mold shape, and There will be no problems such as disconnection,
Since uniform tension is applied to the skin material 12, there is no appearance defect such as wrinkles and unevenness after molding.

Therefore, the molding apparatus 20 according to the present invention has the advantages that molding defects can be prevented in advance and the door trim 10 having a good surface appearance can be molded, and that a material having a comparatively poor elongation property is used. There is also an advantage that it can be used and the degree of freedom in selecting the material of the skin material 12 can be dramatically improved.

In the above-described embodiment, the support frame 61 can be moved by utilizing the spring pressure of the spring 65. In addition to this, as shown in FIG. 9, the side surface of the upper mold 40 is shown. The air cylinder 67 may be attached to the air cylinder 67, and the flange 63 of the support frame 61 may be fixed to the piston rod 67a of the air cylinder 67. The stroke amount of the air cylinder 67 depends on the mold shape and the material of the skin material 12. If set in advance, the skin material 12 can surely follow the mold shape at the time of mold press molding, and a substantially uniform tension is applied to the skin material, which is similar to the above-described embodiment. The effect is obtained.

[0033]

As described above, the molding apparatus according to the present invention has the following special operational effects.

(1) Since at least a part of the peripheral edge of the skin material is held by a movable support pin, if tension is applied to the skin material during mold press molding of the resin core material and the skin material. Since the support pin moves and the skin material easily follows the complicated mold surface shape, even if the product shape is set to a complicated three-dimensional shape, the skin material will not be cut off or resin leaks will not occur. This has the effect of greatly improving the degree of freedom in modeling and significantly reducing the defect rate.

(2) Since at least one side of the peripheral edge of the skin material is held by the movable support pin, the tension applied to the skin material becomes almost uniform by moving the support pin. After the molding press molding, there is no appearance defect such as wrinkles, slack, and grain defects on the skin material, and it is possible to obtain a laminated molded article having a good design.

(3) Since at least a part of the peripheral edge of the skin material is held by a movable support pin, a material having a relatively poor elongation property can be applied as the skin material. The degree of freedom of can be greatly improved, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an external view showing a vehicle door trim manufactured by using the device according to the present invention.

FIG. 2 is a cross-sectional view showing the structure of the vehicle door trim shown in FIG.

FIG. 3 is an overall view showing a configuration of an embodiment of a molding apparatus according to the present invention.

FIG. 4 is a cross-sectional view showing a set state of a skin material in the molding apparatus shown in FIG.

5 is a cross-sectional view showing a step of supplying molten resin in the molding apparatus shown in FIG.

6 is a cross-sectional view showing a mold press molding step in the molding apparatus shown in FIG.

FIG. 7 is a cross-sectional view showing the action of a support pin in the molding apparatus shown in FIG.

FIG. 8 is a cross-sectional view showing a demolding process of a molded product after mold press molding in the molding apparatus shown in FIG.

FIG. 9 is a cross-sectional view of an essential part showing the configuration of a second embodiment of the molding apparatus according to the present invention.

FIG. 10 is a sectional view showing a general structure of a conventional automobile door trim.

FIG. 11 is a sectional view showing a conventional mold press molding method.

[Explanation of symbols]

 10 Automotive Door Trim 11 Resin Core Material 12 Skin Material 20 Molding Equipment 30 Lower Mold for Mold Press Molding 40 Upper Mold for Mold Press Molding 50 Material Supply Mechanism 60 Support Mechanism 61 Support Frame 62, 66 Support Pin 65 Spring 67 Air Cylinder

Claims (1)

[Claims] 1. A molten resin (M) is molded and press-molded into a required shape to mold a resin core material (11), and when the resin core material (11) is molded and press-molded, a resin core material (11) is formed. In a molding apparatus for a laminated molded body, which is integrated with a skin material (12), the molding apparatus (20) is a lower mold for mold press molding having a desired mold surface to which the molten resin (M) is distributed and supplied. (3
0), a desired mold surface shape, and an upper mold (40) for mold press molding which is engageable with the lower mold (30), and an upper mold (4).
In order to hold the skin material (12) on the mold surface of (0), the upper mold (4
0) is provided with a support pin (62, 66) installed on the periphery, and at least one side support pin (62) is movable according to the tension from the skin material (12). Molding device for laminated moldings.