JPH05261756A - Trim parts for automobile and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce the cost by improving the appearance designing and shortening a number of processes, by a method wherein generation of a sink is prevented and a skin material and core material are stuck favorably to each other for unification, in trim parts for an automobile constituted of a core material, which is comprised of an injection molded body, and a skin material and their manufacture. CONSTITUTION:This is a trim part for an automobile comprised by constituting a skin material 32 of a TPE having a material compatible with a material of a core material 31 comprised of an injeciton molded body of synthetic resin provided with shape retaining properties for its base and unifying the skin material 32 with the core material 31 by injection molding and its manufacture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automobile interior parts such as armrests, glove boxes, pillars and the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In general, interior parts made of injection-molded synthetic resin, such as armrests, glove boxes, and various pillars, are often used in automobile compartments.

FIG. 11 shows an armrest 2 which is set substantially in the center of the surface of a door trim 1. Recently, the armrest 2 is often composed of a divided body of an armrest upper 3 and an armrest lower 4. ..

As shown in FIG. 12, the armrest upper 3 includes a core material 5 having shape retention and appropriate rigidity.
And a skin material 6 integrated with the surface of the core material 5 in order to give the product a soft feeling. The core material 5 and the skin material 6 are molded by injection molding in separate steps. ..

Further, as the material of the core material 5, cost,
PP resin is most often used in consideration of moldability, mechanical strength and the like, and vinyl chloride resin is often used as the skin material 6.

The core material 5 and the skin material 6 are attached to each other by inserting and fixing a plurality of locking pieces 6a provided on the back surface of the skin material 6 into the attachment holes 5a of the core material 5. It is the actual situation that is attached to the surface side of the core material 5.

[0007]

As described above, the interior parts represented by the conventional armrest upper 3 have both a core material function for maintaining appropriate strength and a skin function for imparting a good surface feel. Therefore, since the core material 5 and the skin material 6 are separately injection-molded and then both are fixedly mounted, many steps are required, resulting in a significant increase in cost due to an increase in the number of steps. A defect has been pointed out.

Further, in the skin material 6, the locking claw 6
a sink marks (indicated by A in FIG. 12) are apt to occur on the surface portion of the set portion, which causes deterioration of appearance, and when the number of attachment points is set to be small in consideration of the attachment man-hour, the core material 5 and the skin material 6 are Is inferior in adhesiveness, and the skin material 6 becomes dull, which is also a major cause of deterioration in appearance.

Further, usually, as shown in FIG. 13, a power window switch 7 is set on the armrest upper 3, but the peripheral edge of the opening 6b for mounting the power window switch 7 formed on the skin material 6 is lifted, and the power window switch is lifted. At the same time, it was pointed out that problems such as troubles when installing 7 were encountered.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a core material having a shape-retaining property and a core material integrated on the surface side thereof, which is excellent. In an automobile interior part made of a laminate with a skin material having a surface feel and a method for manufacturing the same, a process can be significantly shortened and a product cost can be reduced as compared with a conventional one, and a core material and a skin material can be provided. The object of the present invention is to provide an interior part for an automobile and a method for producing the same, in which good adhesion can be expected and defects such as sink marks do not occur, so that the external appearance is remarkably improved.

[0011]

In order to achieve the above object, an automobile interior part according to the present invention is provided with a core material formed on a surface side of a core material made of a synthetic resin injection-molded body having shape retention. Based on a resin component that is compatible with other resins
The skin material made of E is integrated by injection molding.

Further, the above-described method for manufacturing an automobile interior part includes a core material molding step of molding a core material by injection molding a molten resin for the core material into the cavity of the fixed mold and the movable mold on the core side. , A core material and a skin that integrate the core material and the skin material by injection molding molten TPE into a cavity of a fixed mold on the skin side and a movable mold that holds the molded core material on the mold surface It is characterized by comprising the step of integrating materials.

[0013]

As is apparent from the above construction, the interior parts for automobiles according to the present invention have a structure in which the core material and the skin material are integrated during the injection molding of the skin material, so that sink marks occur on the surface of the skin material. And there is no danger of the skin material sticking.

Further, according to the method for manufacturing an automobile interior part according to the present invention, the TPE is formed in the cavity formed between the fixed mold on the skin side and the movable mold holding the core material on the mold surface.
By injection molding, the skin material and the core material can be integrated, and the skin material injection molding process and the integration process can be performed simultaneously.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The interior parts for automobiles and the manufacturing method thereof according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a door trim for an automobile equipped with a door armrest to which the present invention is applied, FIGS. 2 and 3 are sectional views showing the structure of the door armrest to which the present invention is applied, and FIG. 4 is the present invention. FIG. 5 is a sectional view showing the structure of an embodiment of an apparatus used for carrying out the method, and FIGS. 5 to 10 are sectional views for explaining the method of the present invention over time.

In FIG. 1, a door armrest 20 is installed in a substantially central portion of a vehicle door trim 10 so that an occupant can rest on his / her elbow. The door armrest 20 includes an armrest upper 30 and an armrest lower 40. It is composed of divided bodies.

As shown in FIG. 2, the armrest upper 30 is integrally formed with a core material 31 having a shape-retaining property and a proper rigidity, and a surface of the core material 31 to cover the surface of the core material 31. And a good skin material 32.

The feature of the present invention is that the material of the skin material 32 is based on a material compatible with the material of the core material 31 so that the core material 31 and the skin material 32 can be integrally molded. The point is that a thermoplastic elastomer (hereinafter referred to as TPE) is used, and the elasticity of TPE imparts a good surface feel to the skin material 32.

In this embodiment, polypropylene resin (hereinafter referred to as PP) is used as the material of the core material 31, and PP + EPDM (ethylene-propylene-dienemethylene) is used as the TPE material of the skin material 32.

Therefore, due to the compatibility of the resin, the core material 31 and the skin material 32 can be integrally molded by injection molding as will be described later. Therefore, as in the conventional case, they are separately injection-molded and then fixed by inserting them through a locking piece. The man-hours to be eliminated can be eliminated, and the man-hours can be significantly shortened.

Further, there is no appearance defect such as surface sink mark or dullness of the skin material 32 which occurs at the setting position of the locking piece, and as shown in FIG. 3, a recess for accommodating the flange portion 51 of the power window switch 50 is provided. There is an advantage that the molding of 33 can be performed precisely and the power window switch 50 can be attached smoothly.

Next, a method of manufacturing the armrest upper 30 will be described in detail with reference to FIGS.

FIG. 4 shows the structure of a rotary multicolor injection molding machine for molding the armrest upper 30. This multicolor injection molding machine has a core side fixed die 61 and a skin side fixed die on a fixed plate 60. 62 are arranged side by side, and the core side fixed mold 61 is connected to the core side injection molding machine 63 that supplies PP for the core material 31. On the other hand, skin side fixed mold 62
Is also connected to a skin side injection molding machine 64 that supplies PP + EPDM for the skin material 32.

A movable plate 70 that can move up and down is located above the fixed plate 60. The movable plate 70 can be moved up and down by a lifting cylinder 71, and a rotary plate 72 is provided on the lower surface of the movable plate 70. It is attached, and this turntable 72 is
It is installed so that it can rotate normally and reverse at a rotation angle of 80 degrees.

Further, a pair of movable molds 7 is attached to the turntable 72.
3 (for convenience, the movable mold on the right side in FIG. 4 is 73a and the left side is 73b)
In the state shown in FIG. 4, when the movable platen 70 is lowered, the core side fixed die 61 is engaged with the one side movable die 73a and the skin side fixed die 62 is connected to the other side. The movable die 73b of the one side is engaged with the skin side fixed die 62 by the lowering operation of the movable board 70 when the rotary disc 72 rotates forward by 180 degrees. The other movable mold 73b is configured to engage with the core-side fixed mold 61.

Reference numeral 74 represents a rotary gear type rotating device for reversing the turntable 72 forward and backward.

A process of molding the armrest upper 30 using the rotary multicolor injection molding machine having the above-described structure will be described.

First, as shown in FIG. 5, the movable platen 70 is lowered by the operation of the lifting cylinder 71, the core-side fixed mold 61 and the movable mold 73a are engaged, and the core-side injection molding machine 63.
The molten PP resin for the core material 31 is filled in the cavity, cooled and solidified, and the core material 31 is molded.

Thereafter, as shown in FIG. 6, the movable plate 70 is raised by the operation of the lifting cylinder 71, and the mold opening is performed. At this time, the core material 31 is held on the mold surface of the movable mold 73a.

Then, the rotary disk 72 is rotated 180 degrees forward by the rotary gear type rotating device 74, and as shown in FIG.
The movable die 73a holding the core material 31 is located above the skin side fixed die 62, and the other side movable die 73b is located above the core side fixed die 61.

Further, as shown in FIG. 8, the movable platen 70 is lowered by the operation of the lifting cylinder 71, and the movable mold 73a holding the core material 31 is engaged with the skin side fixed mold 62.
The movable die 73b on the other side engages with the core side fixed die 61.

Then, in this mold-engaged state, the skin side injection molding machine 64 is used to form the skin material 32 from TPE (PP +).
EPDM) is filled in the cavity between the core material 31 and the mold surface of the skin side fixed mold 62, the skin material 32 is injection-molded, and the core material 31 and the skin material 32 are integrally molded.

Further, in the core-side fixed die 61, a molten PP resin for the core material 31 is filled in the cavity between the core-side fixed die 61 and the movable die 73b on the other side to mold the core material 31. ing.

After that, when the cooling period ends, the movable platen 70 is raised by the operation of the lifting cylinder 71, and the mold opening is performed. At this time, as shown in FIG.
The armrest upper 30 in which the core material 31 and the skin material 32 are integrated is held on the mold surface of a, and the knock pin 75 may be ejected to take out the armrest upper 30.

In this state, the movable mold 73 on the other side is
The core material 31 is held on the mold surface of b.

After that, the rotary gear type rotating device 74 is operated and the rotating plate 72 is inverted by 180 degrees.
0 is the state shown in FIG.
It is in the same state as in FIG. 7, except that b is replaced.
Therefore, thereafter, if the mold clamping and the injection molding are continuously performed, the armless upper 30 can be continuously molded.

As described above, according to the method of the present invention, since TPE based on a material compatible with the resin material of the core material 31 is used as the material of the skin material 32, it has shape retention and It is possible to efficiently form an interior part made of a laminate having an excellent surface feel, which is suitable for an interior part for automobiles which is required to be mass-produced.

[0039]

As described above, the present invention has the following special operational effects.

(1) The interior parts for automobiles according to the present invention are:
Since the core material having shape retention and the skin material made of TPE are integrally formed by injection molding, it is not necessary to form a locking piece on the skin material as in the conventional case. Since the core material and the skin material are closely adhered and integrated with each other, there is no dullness of the skin material and the appearance and design of the product are significantly improved.

(2) According to the method of the present invention, during injection molding of the skin material, by filling the TPE material into the cavity formed by the core material held by the movable mold and the mold surface of the fixed mold, Since the core material and the skin material can be integrally injection-molded, there is an effect that the conventional man-hours for attaching the core material and the skin material can be saved, and the cost can be significantly reduced by shortening the process.

[Brief description of drawings]

FIG. 1 is a perspective view showing a vehicle door trim equipped with a door armrest to which the present invention is applied.

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

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a vertical sectional view showing the configuration of an embodiment of a rotary multicolor injection molding machine for carrying out the method of the present invention.

FIG. 5 is a cross-sectional view showing a state during injection molding of the core material in the method of the present invention.

FIG. 6 is a cross-sectional view showing a mold open state after molding the core material in the method of the present invention.

FIG. 7 is a cross-sectional view showing a state before molding of the skin material in the method of the present invention.

FIG. 8 is a cross-sectional view showing a step of integrally molding a core material and a skin material in the method of the present invention.

FIG. 9 is a cross-sectional view showing a mold open state after integral molding of the core material and the skin material in the method of the present invention.

FIG. 10 is a cross-sectional view showing an inverted state of the rotary disc after injection molding of the interior part in the method of the present invention.

FIG. 11 is a front view showing a door trim to which a conventional door armrest is attached.

12 is a sectional view taken along line XII-XII in FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

[Explanation of symbols]

 10 Automotive Door Trim 20 Door Armrest 30 Armrest Upper 31 Core Material 32 Skin Material 40 Armrest Lower 50 Power Window Switch 60 Fixed Plate 61 Core Side Fixed Type 62 Skin Side Fixed Type 63 Core Side Injection Molding Machine 64 Skin Side Injection Molding Machine 70 Movable Plate 71 Lifting Cylinder 72 Rotating Plate 73 (73a, 73b) Movable Type 74 Rotary Gear Type Rotating Device 75 Knock Pin

Claims (2)

[Claims] 1. A TPE based on a resin component compatible with the resin of the core material (31) is formed on the surface side of a core material (31) made of an injection-molded body of a synthetic resin having shape retention. An interior part for an automobile, characterized in that a skin material (32) is integrated by injection molding. 2. A core-side fixed mold (61) and a movable mold (73)
A core material molding step of molding the core material (31) by injection-molding a molten resin for the core material (31) in the cavity of, and a fixed mold (62) on the skin side, and the molded core material ( 31)
The core material (3) is formed by injection-molding TPE in a molten state into the cavity of the movable die (73) which holds the die on the die surface.
1) A step of integrating a core material and a skin material that integrates 1) and the skin material (32) with each other, and a method for manufacturing an automobile interior part.