JPH05220772A - Partial decoration method in stamping molding - Google Patents

Abstract

PURPOSE:To integrally mold a decorative piece at the time of press molding by a method wherein the decorative piece is set to a part of an upper mold by a setting pin when a thermoplastic resin is injected in a lower mold to be subjected to press molding along with a skin material and a hole is bored in the skin material at the time of press molding by the setting pin to allow the molten resin to penetrate in the hole to bond the decorative piece to the skin material. CONSTITUTION:A protruding edge 11a is provided to a part of the molding surface 10a of an upper mold 10 to form a decorative piece attaching part 11. A plurality of setting pins 12 holding a decorative piece 4 is provided to the decorative piece attaching part 11 in a protruding state. A resin passage 14b is formed to a lower mold 14 and the groove part 15a in which the protruding edge 11a of the decorative piece 11 is fitted is formed to the lower mold 14. When a thermoplastic resin 5 is injected in the molding surface 14a of the lower mold and the upper mold 10 is allowed to fall, a skin material 2 and the resin 5 are subjected to press molding and, at the same time, pinholes are made in the skin material 2 by the setting pins 12 of the upper mold and a part of the molten resin 5 passes through the pinholes to penetrate in the gap between the decorative piece 4 and the skin material 2 to integrally bond both of them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for partially decorating a molded product by attaching a decorative piece such as an ornament to a part of the molded product in stamping molding for molding a door trim of an automobile.

[0002]

2. Description of the Related Art When an ornament is attached to a part of the surface of a door trim to partially decorate the door trim, a fabric b2 is conventionally attached to a core material b1 of a synthetic resin plate or an iron plate as shown in FIG. Ornament b
The door trim a is molded by caulking with a nail or by ultrasonic welding.

[0003]

In the above partial decoration method, since the ornament b is attached to the door trim a after the door trim a is formed, the problem that the number of manufacturing steps of the door trim with ornament is increased and the fabric b2 is used as the core material. b
Since it is attached to No. 1, the number of manufacturing steps of the ornament b increases, and the weight of the door trim increases due to the core material b1. The present invention aims to solve the above problems.

[0004]

According to the present invention, a molten thermoplastic resin is injected onto a molding surface of a lower mold, and a skin material is press-molded between the upper mold and the lower mold while In the stamping molding in which a resin base material is laminated on the skin material, a plurality of sets projecting from the decorative piece mounting portion inside the decorative piece mounting portion formed with the decorative piece on a part of the molding surface of the upper die. A plurality of pin holes are formed in the skin material by the set pins while press-forming the decorative piece between the decorative piece attaching portion and the lower decorative piece forming portion in a state of being set by the pin. Partial decoration for adhering the decorative piece to a part of the skin material by an adhesive layer of the thermoplastic resin that has penetrated through the pin holes and entered between the decorative piece and the skin material The method is the gist.

[0005]

[Function] When stamping-molding a molded product with a decorative piece, the skin material is press-formed between the upper mold and the lower mold, and the decorative piece is a decorative piece attachment portion of the upper mold and a decorative mold of the lower mold. A plurality of set pins provided for setting the decorative piece in the decorative piece attaching portion are press-molded between the one-sided molding portion and the skin material by allowing the plurality of set pins to penetrate therethrough. A plurality of pin holes are punched by each set pin, and a part of the thermoplastic resin coated on the back surface of the skin material in a molten state passes through each pin hole and between the decorative piece and the skin material. Intruding into the space, the decorative piece is attached to a part of the outer skin by the adhesive layer of the thermoplastic resin.

[0006]

Since the present invention is configured as described above, the decorative piece can be attached to the molded product simultaneously with the molding of the molded product, and after the molded product is molded, the decorative piece can be formed into the molded product. Since the step of attaching is unnecessary, it is possible to simplify the manufacturing process of the molded product with a decorative piece. In addition, the step of producing a decorative piece by attaching the fabric to the core material is not required, and the core material is not required, so that the weight of the molded product can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to the drawings. In a molding device for stamping and molding a door trim 1 with a decorative piece in which a decorative piece 4 such as an ornament in which a skin material 2 and a resin base material 3 are laminated is fixed to a part of the skin 2, a molding surface of an upper mold 10 is formed. A flange 11 is provided on a part of 10a.
A decorative piece mounting portion 11 is formed on which a is projected around and the decorative piece 4 is set. The decorative piece mounting portion 11 holds the decorative piece 4 in the decorative piece mounting portion 11. Then, the decorative piece mounting part 1
A plurality of set pins 12 for setting to 1 are projected.

The protruding length of each pin 12 is the skin material 2 and the decorative piece 4.
The length is set to be slightly longer than the combined thickness of and, and the length is such that each set pin 12 does not contact the molding surface 14a of the lower mold 14 when the upper mold 10 descends to the lower end.

A resin passage 14b through which the thermoplastic resin 5 injected in a molten state onto the molding surface 14a flows is formed in the lower mold 14, and a decorating material is attached to a part of the molding surface 14a of the lower mold. The decorative piece forming portion 15 in which the groove portion 15a into which the projecting edge 11a of the portion 11 is inserted is provided as a recess is the decorative piece attaching portion 11
Are formed to face each other.

In the stamping molding of the door trim 1, the molten thermoplastic resin 5 is injected onto the molding surface 14a of the lower mold 14, and the skin material 2 that has been heated and entered between the upper mold 10 and the lower mold 14 is removed. The thermoplastic resin 5 is sandwiched between the lowered upper mold 10 and the lower mold 14 and press-molded, and at the same time, the thermoplastic resin 5 spreads over the molding surface 14a of the lower mold 14 and the skin material 2
The door trim 1 is manufactured by laminating the resin base material 3 coated on the entire back surface of the above and solidifying the thermoplastic resin layer on the skin material 2.

A skin material 2 in which a foam layer 2b is laminated on a skin 2a, and a decorative piece 4 in which a backing layer 4b made of a thermoplastic resin of the same material as the thermoplastic resin 5 is lined on a fabric 4a are used. When molding the door trim 1 with a decorative piece, the decorative piece 4 is inserted into the decorative piece 4 and the decorative piece 4 is bent downward in the vicinity of the end edge of the decorative piece 4. When the backing layer 4b is set on the decorative piece mounting portion 11 with the lower side thereof, and the thermoplastic resin is injected onto the molding surface 14a of the lower side 14 to lower the upper die 10 to the lower end, the skin material 2 is pressed. At the same time as molding, the decorative piece 14 is the decorative piece mounting portion 1
1 and the decorative piece molding portion 15 are press-molded via the skin material 2, and each set pin 12 penetrates the skin material 2 to form a plurality of pin holes 7 by each set pin 12. To be perforated.

When each pin hole 7 is formed in the skin material 2, a part of the thermoplastic resin 5 travels through each set pin 12 from the back side of the skin material 2 through each pin hole 7 and becomes a decorative piece 4. It penetrates into the surface material 2 and is applied to the entire back surface of the backing layer 4b of the decorative piece 4.

When the thermoplastic resin 5 is solidified in this state, the adhesive layer 6 in which the thermoplastic resin applied to the backing layer 4b of the decorative piece 4 is solidified is laminated on the decorative piece 4 to form the decorative piece 4 Is adhered to a part of the surface of the skin material 2 by the adhesive layer 6, and the backing layer 4b of the decorative piece 4 and the adhesive layer 6 are integrally joined.

A carpet, a pocket or the like may be used as the decorative piece 4.

Next, the operation and effect of the embodiment having the above-mentioned structure will be described. In this example, the molten thermoplastic resin 5 is injected onto the molding surface 14a of the lower mold 14, and the skin material 2 is applied to the upper mold 1.
0 and the lower mold 14 are pressed together, the decorative piece 4 is formed on the molding surface 10 of the upper mold 10 in stamping mold molding in which the resin base material 6 of the thermoplastic resin 5 is laminated on the skin material 2.
In a state in which the decorative piece mounting portion 11 formed in a part of a is set by the plurality of set pins 12 projecting from the decorative piece mounting portion 11, the decorative piece 4 and the decorative piece mounting portion 11 are set. Lower mold 1
While press-forming with the decorative piece forming part 15 of 4, the plurality of pin holes 7 are punched in the skin material 2 by each set pin 12, and the decorative piece 4 and the skin are passed through each pin hole 7. The decorative piece 4 is adhered to a part of the skin material 2 by the adhesive layer 6 of the thermoplastic resin 5 that has entered between the material 2 and the door trim 1 with the decorative piece. Therefore, the decorating piece 4 can be attached to the skin material 2 at the same time when the door trim is formed, and the step of attaching the decorating piece to the door trim after forming the door trim is not required. The process can be simplified. Further, the step of manufacturing the decorative piece by attaching the fabric to the core material is not necessary, and the core material is not necessary, so that the door trim 1 can be made lightweight.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a molding apparatus for explaining a partial decorating method according to an embodiment of the present invention.

FIG. 2 is likewise a vertical cross-sectional view of a door trim with a decorative piece.

FIG. 3 is likewise an enlarged vertical sectional view of a main part of a door trim with a decorative piece.

FIG. 4 is a vertical cross-sectional view of a door trim with a decorative piece for explaining a conventional method of attaching the decorative piece.

[Explanation of symbols]

 1 Door Trim with Decorative Piece 2 Skin Material 3 Resin Base Material 4 Decorative Piece 5 Thermoplastic Resin 6 Adhesive Layer 7 Pin Hole 10 Upper Mold 11 Decorative Piece Attachment Part 12 Set Pin 14 Lower Mold 15 Decorative Piece Molded Part

Claims (1)

[Claims] 1. A molten thermoplastic resin is injected onto a molding surface of a lower mold, and a skin material is press-molded between an upper mold and a lower mold, while a resin base material of the thermoplastic resin is formed on the skin material. In the stamping mold molding to be laminated to, in a state where the decorative piece is set by a plurality of set pins protruding from the decorative piece mounting portion formed in the decorative piece mounting portion formed on a part of the molding surface of the upper die, While press-molding the decorative piece between the decorative piece mounting portion and the decorative piece forming portion of the lower mold, a plurality of pin holes are punched in the skin material by the set pins, and each pin is formed. A partial decorating method characterized in that the decorative piece is bonded to a part of the skin material by an adhesive layer of the thermoplastic resin that has passed through a hole and entered between the decorative piece and the skin material.