JP2791532B2 - Method and apparatus for manufacturing automotive interior parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interior part such as a door trim which is an interior material for an automobile, and more particularly to a method of cutting a grain of a skin joint of an interior part having a skin and a manufacturing apparatus therefor.

[0002]

2. Description of the Related Art As shown in FIG. 7, an interior material called a door trim 31 is fitted inside an automobile door 30.
Covering the metal part of the body, the interior of the cabin is improved to create a soft atmosphere.

The door trim 31 is usually formed of a synthetic resin. The armrest 34 and the door pocket 35 are integrally formed. In order to further enhance the decorative effect, the surface of the door trim 31 is made of leather, cloth, or the like. One skin or insulative material 32, 36 and another skin or insulative material 3
3 is often set. The connecting portions 37 on the surfaces of the one skin material 32 and 36 and the other skin material 33 stretched over the surface layer of the door trim 31 use a so-called wood graining method for the purpose of not impairing their aesthetic appearance. Connection has been made.

For example, as shown in FIG. 8, when one skin material 32 and another skin material 33 are stretched over the surface of a core material 42 in a door trim 31 and a connection portion 37 is provided, each of the skin materials 32, 33 is provided. Connection ends 40 and 41 of the core material 4
The connection is made in a state where it is inserted into the second groove 38.

As a method for forming a door trim having such a grained portion, for example, Japanese Patent Application Laid-Open No. 2-175111 discloses a method and apparatus for integrally molding and molding a skin having a grained portion and a core material. I have.

According to this method, a door trim is formed as follows. That is, in FIG.
Reference numeral 0 denotes an upper mold 51, a lower mold 53, and a skin clamp 52. Further, the lower die 53 is formed with a wood grain groove 55 so that the wood grain part 70 of the door trim 31 is fitted.

In this method and apparatus, first, the skins 32 and 33 are bonded or welded at the wood grained portion 70, and are sandwiched by the holding bodies shown in FIGS. At the same time, the other end is locked to a skin clamp 52 separate from the upper mold 51 and the lower mold 53. Next, while injecting the material of the core material 42 such as a synthetic resin melted from an injection port 54 provided in the lower mold 53, the upper mold 51 is lowered and engaged with the lower mold 53, thereby forming a predetermined shape and a grained portion 70. The door trim 31 is integrally molded.

In this method and apparatus, two types of locking methods for the wood grained portion 70 to the lower mold 53 are used at the same time, as shown in FIGS. 10 and 11, respectively. In FIG. 10, the ends 40 and 41 of the skins 32 and 33 are pinched by a pin 59 or the like, using a pinching member 58 having a small width (a portion).
8, and then the projection 61 of the holding body 58 is fitted into a fitting groove 60 provided at the bottom of the groove 57 of the lower mold 53 to lock the grained portion 70 to the lower mold 53. is there.

In another method shown in FIG. 11, the end portions 40, 41 of the skins 32, 33 are locked to the holding member 58 'by pins 59, etc., using a holding member 58' having a large width (part b).
After that, the protrusion 61 'of the holding body 58' is fitted into the fitting groove 60 provided at the bottom of the wide groove 57 'of the lower mold 53, thereby locking the wood grain portion 70 to the lower mold 53. It is. In this wide clamping body 58 ′, gaps 62 and 63 can be provided between the clamping body 58 ′ and the wood-grained ends 40 and 41 of the skins 32 and 33, and the gaps 62 and 63 are formed on different sides. Are communicated with the gaps 62 'and 63'.

[0010] This is because, in a portion where the holding member 58 having a small width is used, the holding member 58 completely blocks the groove 57 of the lower mold 53. In order to avoid a situation where the resin does not turn to the side of the skin 32, a wide sandwiching body 58 'having gaps 62 and 63 communicating therewith is used in combination.

[0011]

In such a prior art, since the door trim having the skin and the grained portion can be integrally formed, the contribution to the production efficiency is recognized to be considerably large. It has a number of problems.

That is, as described above, another step of locking the skin end portion to the separate holding body in advance is required.
In addition, since there are two types of the width of the holding body, it is complicated to arrange them at appropriate positions.

Next, two types of lower mold grooves are required to fit the two types of clamping bodies, which are inevitably a factor in increasing the cost of designing the mold.

Further, although the passage is provided in the holding body, the flow of the molten synthetic resin is restricted due to the bottleneck, and the resin is not turned around particularly around the narrower holding body, and occurrence of a problem is observed. Have a problem. For this reason, design factors such as the position and balance of the holding body are increased, and there is no choice but to be restricted by the modeling of the joint, and the degree of freedom in design is sacrificed.

Although the lower mold is locked by using the holding body, the locking depends on the frictional force of the fitting portion between the holding body and the lower mold. Pressure may cause the holding body to be displaced, resulting in a problem that the shape of the grained portion is eventually deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and does not require the use of a separate holding member when manufacturing an interior part having a wood-grained portion. It is an object of the present invention to provide a method of manufacturing an interior component that is inexpensive and has high quality such as aesthetics and strength, and a device therefor, which does not cause any trouble caused by the pressure or its pressure.

[0017]

The above-mentioned problem in the production of the interior part having the grained portion is caused by the fact that the holding body at the end of the skin is fitted to the lower mold before filling with the molten synthetic resin. Therefore, the present inventor does not use this holding body,
The present invention has been accomplished as a result of intensive studies on a method and an apparatus for manufacturing an interior component that does not hinder the flow of the synthetic resin.

That is, in order to achieve the above object, a method of manufacturing an automobile interior part according to the present invention is a method for manufacturing an interior part for an automobile, comprising the steps of: The molten resin is integrally molded into a gap formed between the upper and lower molds by supplying molten resin to the upper and lower molds,
In the method for molding an automobile interior part having a grained portion, a joint portion of the skin material is fitted into a groove formed by a grained bar provided on the upper mold and a bottom surface, and molten resin is placed on the lower mold. After the upper and lower molds are closed, and before the molten resin is hardened, the grained portion is folded back into the grained groove provided at a position corresponding to the grained bar on the lower mold by the grained bar. It is characterized by

According to another aspect of the present invention, there is provided an apparatus for manufacturing an interior part for an automobile, comprising: a mold for connecting a skin material with at least two skins stretched between upper and lower molds; In a molding apparatus for an automobile interior part having a grained portion for integrally molding the skin and the molten resin into a gap formed between the upper and lower molds by supplying the molten resin to the upper and lower molds, A groove for temporarily fitting the grained portion of the epidermis into the upper mold, and a grained portion provided on the lower mold, forming a bottom portion of the groove and injecting the molten resin before it is hardened. And a movable wood grain bar that is folded back into the groove.

Further, in order to achieve the above object, a method of manufacturing an automobile interior part according to the present invention is directed to a method of manufacturing an automobile interior part, which comprises the steps of joining a skin material having at least two skins stretched between upper and lower molds and a mold. The molten resin is integrally molded into a gap formed between the upper and lower molds by supplying molten resin to the upper and lower molds,
In the method for molding an automobile interior part having a grained portion, a molding material is fixed integrally to the grained portion of the skin in advance, and a grained bar provided on an upper mold forms a bottom surface of the head of the molding. It is fitted in the groove, and after the molten resin is injected and before it is hardened, the wood grain portion of the epidermis penetrates into the wood grain groove of the lower mold while pushing the molding head by the wood grain bar. .

[0021]

The operation of the method and the apparatus for manufacturing an automobile interior part according to the present invention will be described. That is, in the method and apparatus for manufacturing an automobile interior part according to the present invention, a molten resin serving as a core material is provided between a mold and a skin material obtained by joining at least two or more skins stretched between upper and lower molds. Before supplying and bonding the skin and the molten resin integrally in the gap shape formed between the upper and lower molds, the joint portion of the skin end is provided on the upper mold, and the grained bar is provided on the bottom surface. Before being hardened after injecting the molten resin into the constituting groove, before injecting the molten resin, the joint portion of the skin end portion is folded back into a lower predetermined wood grain groove by pressing the wood grain bar, and thereafter This is cooled to complete the hardening molding.

[0022] For this reason, the wood grain portion, which has conventionally blocked the flow of the molten resin for the core material injected, is temporarily fitted into the lower mold, so that there is nothing in the lower mold that blocks the flow of the resin. Therefore, a sufficient resin flow can be ensured.

After the resin has flowed sufficiently, the upper and lower molds are engaged and pressurized, and at the same time, the wood grain portion which has been temporarily fitted into the upper mold is folded back by the wood grain bar, and the wood grain portion is returned to the regular wood grain position. Since the wood-groove groove is filled with a synthetic resin for core material in advance, and the wood-grain portion is pushed into the groove, the resin flow around the wood-grain portion may be insufficient. No failures are seen.

Further, when a molding material is used in the grained portion, the molding material is preliminarily bonded to the grained portion in advance.
Before the head of the molding material is hardened after the molten resin serving as the core material is injected, the wood-grained bar provided in the upper mold with the wood-grained portion of the skin being fitted into the groove constituting the bottom surface is injected. By pressing the wood grain bar, the wood grain part to which the molding material has been pre-adhered is pushed into a predetermined wood grain groove of the lower mold, and then the molten resin is cooled to complete the hardening molding. For this reason, there is no object that blocks the flow of the resin, such as the wood-grained portion, which has conventionally blocked the flow of the molten resin for the core material, so that a sufficient flow of the resin can be secured.

After the resin has flowed sufficiently, the upper and lower molds are engaged and pressed, and at the same time, the wood grain portion to which the molding material is pre-adhered is pushed into the regular wood grain position by the wood grain bar. However, since the synthetic resin for the core material is filled in advance in the wood grain groove, and the wood grain part to which the molding material is pre-bonded is pushed into the groove, the resin is formed around the wood grain part to which the molding material is pre-bonded. There is no observable failure caused by the lack of flow.

Further, by adjusting the pushing amount of the wood grain bar, the amount of protrusion of the molding material head from the joining portion can be arbitrarily set, so that the appearance of the joining portion is further improved. Moreover, since the skin material can be set by fitting the head of the molding into the groove of the upper mold, the setting property is improved. In addition, since the tail part of the molding has a shape retaining property, it becomes easy to insert a grain in the groove at the time of molding.

[0027]

The above will be described in detail with reference to embodiments. In FIG. 1, a molding apparatus 1 for an automobile interior part includes an upper mold 2, a lower mold 7, and a clamp 3. The upper die 2 is provided with a groove 10, and the bottom is formed by the end face of the wood grain bar 6. The wood grain bar 6 is connected to the cylinder 5 and can be set at an arbitrary position at an arbitrary timing independently of the upper mold 2. The lower die 7 is provided with a wood groove 9 and an injection port 8 for injecting a molten resin for a core material. The clamp 3 is connected to the cylinder 4,
The ends 12, 12 'of the skin materials 11, 11' of the door trim are locked and positioned arbitrarily. The basic function of the upper mold 2 and the lower mold 7 is that the molten resin is supplied from the injection port 8 into the gap formed by the engagement of the two, and then cooled and solidified to form the core material of the door trim. is there.

A door trim having a plurality of skins 11 and 11 'and a grained portion is formed by using such an apparatus. As the molten resin for the core material here, for example, a thermoplastic synthetic resin that can be injection-molded, such as ABS or a polypropylene composite material, is used. As the skin material, a cloth having urethane bonded to the back surface, a sheet made of synthetic resin such as synthetic leather, natural leather, and foamed PVC, and the like are used.

Hereinafter, a series of operations of this apparatus, particularly the vicinity of the cut-in portion of the bark, will be mainly described with reference to FIGS. 2, 3 and 4. FIG. 2 shows a state before the upper mold 2 descends. That is, first, the ends 13, 13 'of the skins 11, 11' are joined in advance by performing treatments such as sewing, welding, pinning, and bonding, and the joining portion 19 is formed in the groove 10 provided in the upper die 2. Fit into. Then, the molten resin 20 for the core material is injected from the injection port 8 with the upper mold 2 raised, and covers a predetermined surface including the wood groove 9 of the lower mold 7.

After injecting a predetermined amount of molten resin, the upper mold 2 descends as shown in FIG. 3, and in a state where the upper mold 2 and the lower mold 7 are engaged with each other, the outer skin 11, 11 'and the core material The molten synthetic resin 20 is formed into a substantially predetermined shape.

Subsequently, as shown in FIG. 4, the cylinder 5 of the upper mold 2 is lowered, and accordingly, the grained bar 6 is also lowered.
The joint portions 19 of the skins 11 and 11 ′ are bent so as to be pressed down and are pushed into the wood groove 9 of the lower mold 7 to form a wood grain portion. In this state, the core resin 20 is cooled and solidified to complete the molding of the door trim having the wood grained portion 26.

Next, a molding method in the case of using a molding material for the wood grain portion will be described with reference to FIGS. FIG. 5 shows a state before the upper mold 2 descends. That is, the epidermis 11, 1
The ends 13 and 13 'of 1' are molding materials (resin, metal, etc.) 2
The three core portions 22 are sandwiched therebetween and are joined using, for example, pins 24. The core 22 and the skin 11 of the molding material 23,
It is not essential to use the pins 24 for connection to the ends 13, 13 ′ of the 11 ′, but any other suitable method such as bonding, welding, sewing or the like can be used. For example, the molding is a PVC extruded product, and the skin is PVC.
If it is a sheet, it can be welded to each other. If the skin is a foamed PVC sheet with a backing fabric or a cloth with urethane bonded to the back, the molding and the skin are joined by sewing. can do.
Then, the head 21 of the molding material 23 is fitted into the groove 10 provided in the upper mold 2. At this time, the top portion of the head 21 is pressed by the grained bar 6 so as not to be unnecessarily fitted into the groove 10. In this state, the molten resin 20 for the core material is injected from the injection port 8 of the lower mold 7 to cover a predetermined surface including the wood groove 9 of the lower mold 7.

After injecting a predetermined amount of molten resin, the upper mold 2
Descends, and in a state where the upper mold 2 and the lower mold 7 are engaged with each other, the skins 11 and 11 ′ and the molten synthetic resin 20
Is formed into a substantially predetermined shape. At this time, the connecting portion 26 connecting the molding material 23 also in the wood groove 9 of the lower mold 7.
Will be pushed.

Subsequently, as shown in FIG. 6, the cylinder 5 of the upper mold 2 is lowered, and accordingly, the wood grain bar 6 is also lowered.
Since the head 21 of the molding material is appropriately pressed, the amount of protrusion of the molding material head 21 from the skins 11 and 11 ′ can be adjusted. Thereafter, in this state, the core material resin 20 is cooled and solidified to complete the molding of the door trim having the wood grained portion 25 provided with the molding material.

[0035]

As described above, according to the method and apparatus for manufacturing an automobile interior part according to the present invention, it is not necessary to provide a skin fixing material, so that a process for this is not required and a complicated process is required. Since a mold having a wood grain groove is not required, the manufacturing cost can be significantly reduced.

Further, according to the method and the apparatus for manufacturing interior parts for automobiles of the present invention, since the injection can be performed so as not to hinder the flow of the core resin, a sufficient resin flow can be ensured, and the defect caused by the insufficient resin flow can be obtained. At the same time, the grained portion is finally molded after the resin has sufficiently flowed, so that a problem caused by insufficient wraparound of the resin near the grained portion can be eliminated. Further, it is possible to eliminate defects such as displacement of the joint due to the resin flow and displacement of the grained portion itself.

According to the method and apparatus for manufacturing an automobile interior part of the present invention, the amount of protrusion of the molding material head from the joint can be arbitrarily set, so that the appearance of the joint is further improved. It has the effect of doing. Moreover, since the skin material can be set by fitting the head of the molding into the groove of the upper mold, the setting property is improved. In addition, since the tail part of the molding has a shape retaining property, it becomes easy to insert a grain in the groove at the time of molding.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an apparatus for molding an automobile interior part having a wood grain according to one embodiment of the present invention.

FIG. 2 is an explanatory view of a method for molding an interior part for a vehicle having a wood grain according to an embodiment of the present invention.

FIG. 3 is another explanatory view of a method for molding an interior part for an automobile having a grained portion according to an embodiment of the present invention.

FIG. 4 is another explanatory view of a method for molding an interior part for a vehicle having a grained portion according to an embodiment of the present invention.

FIG. 5 is an explanatory view of a method for molding an automobile interior part having a wood grain according to another embodiment of the present invention.

FIG. 6 is another explanatory view of a method for molding an interior part for an automobile having a grained portion according to another embodiment of the present invention.

FIG. 7 is an explanatory view of interior parts of an automobile.

FIG. 8 is an explanatory cross-sectional view of an automobile door trim having a grained portion.

FIG. 9 is an explanatory view of a molding apparatus for an automobile door trim having a wood grain according to a conventional example.

FIG. 10 is an explanatory view of a method of forming a door trim for an automobile having a grained portion according to a conventional example.

FIG. 11 is another explanatory view of a method of forming a door trim for an automobile having a grained portion according to a conventional example.

[Explanation of symbols]

 1, 50 Door trim forming device 2, 51 Upper die 3, 52 Clamping device 4, 5 Cylinder 6 Wood grain bar 7, 53 Lower die 8, 54 Injection port 9 Wood grain groove 10 Groove 11, 11 ', 32, 33 Skin material 12, 12 ', 13, 13' skin end 19, 26 joint 20 molten resin 21 head 22 core 23 molding material 24, 59 pin 25, 27 wood grain 30 automobile door 31 door trim 42 core 58, 58 'sandwiching Body 60 Fitting groove 61, 61 'Convex portion 62, 63 Passage 70 Wood grain

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-175111 (JP, A) JP-A-4-345523 (JP, A) JP-A-4-24138 (JP, A) JP-A-4- 345524 (JP, A) JP-A-4-24139 (JP, A) JP-A-61-230920 (JP, A) JP-A-4-214312 (JP, A) JP-A-61-163833 (JP, A) JP-A-63-46919 (JP, A) JP-B 5-62577 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60J 5/00 B60R 13/02

Claims (3)

(57) [Claims] 1. An air gap formed between upper and lower molds by supplying a molten resin between the mold and a skin material in which at least two or more skins stretched between upper and lower molds are joined. A method for molding an interior part for an automobile having a grained portion, wherein a skin and a molten resin are integrally formed, wherein a joining portion of the skin material is fitted in a groove formed by a grained bar provided on the upper die. The upper and lower molds are closed after supplying the molten resin on the lower mold, and before the molten resin is hardened, the joint portion of the skin is moved to a position corresponding to the grained bar on the lower mold by the grained bar. A method of manufacturing interior parts for automobiles, characterized in that a wood grain is formed by folding back into a wood grain groove provided. 2. A gap formed between the upper and lower molds by supplying a molten resin between the mold and a skin material obtained by joining at least two skins stretched between the upper and lower molds. A molding device for an automobile interior part having a wood grain portion for integrally molding a skin and a molten resin, wherein a groove for temporarily fitting the wood grain portion of the skin into an upper mold corresponding to a joint part of the skin, A movable wood grain bar, which forms the bottom of the groove and folds the wood grain part into a wood grain groove provided in the lower mold before injecting the molten resin and before it is cured, for an automobile. Interior parts manufacturing equipment. 3. A gap formed between the upper and lower molds by supplying a molten resin between the mold and a skin material obtained by joining at least two skins stretched between the upper and lower molds. A molding material for an automobile interior part having a grained portion, wherein a molding material is integrally fixed to the grained portion of the skin in advance, and a head of the molding is fixed to an upper mold. The wood grain bar provided at the bottom is fitted in the groove constituting the bottom surface, and after the molten resin is injected and before it hardens, the wood grain part of the skin is pushed down by the wood grain bar while the wood grain bar is pushed in. A method for manufacturing an automobile interior part, characterized by penetrating into a wood grain groove.