JP3123017B2 - Multi-layer molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming a good multilayer molded product which is applied to interior materials of automobiles and the like.

[0002]

2. Description of the Related Art As a door trim as an interior material of an automobile, as shown in FIG. 13, a multilayer molded product 1 in which a skin material 3 covers a part of a resin molded body 2 and a parting line 5 is formed is used. Have been. This multilayer molded article 1 is molded by a molding apparatus 10 as shown in FIG.

That is, in a molding apparatus 10 shown in FIG. 14, reference numeral 7 denotes an upper die, and reference numeral 9 denotes a lower die. The upper die 7 is fixed to the upper platen 6, and the lower die 9 is fixed to the lower platen 8. The parting line 5 of the skin material 3 is formed on the molding surface 7a of the upper die 7.
The small projection wall 11 is provided at a position corresponding to. Also,
The molding surface 9a of the lower die 9 is provided with a vertically movable slide die 14 having a concave groove 12 at a position corresponding to the small projection wall 11 of the upper die 7.
A pin 13 which can be moved up and down slightly is provided at a position slightly away from the pin 13.

[0004] In molding the multilayer molded article 1, FIG.
(A) As shown in FIG.
Is placed on the molding surface 9a of the lower die 9. In this case, the skin material 3 is arranged so that the surface thereof faces the upper mold 7 side.

Next, the upper mold 7 is lowered, and
And the gap between the molding surfaces 7a, 9a of the lower mold 9 is temporarily stopped at a predetermined position larger than the thickness of the product. At this stop position, as shown in FIG. 14 (b), the skin material 3 is lifted while the pin 13 and the slide mold 14 are moved upward, and lightly comes into contact with the molding surface 7a of the upper mold 7. next,
In this state, the molten resin 4 is injected between the lower die 9 and the skin material 3 (the back side of the skin material 3) through a resin passage (not shown) provided in the lower die 9. 0.5 seconds after the start of injection, the pin 13 is lowered to the original position shown in FIG. 14A, and after 1.0 second, the slide die 14 is also lowered to the original position.

Next, as shown in FIG. 14C, the upper die 7 is lowered again. Thereby, the molten resin 4 becomes the skin material 3
While being pressed by the upper mold 7 and the lower mold 9 through the opening, it spreads between the molding surfaces 7a and 9a of the upper mold 7 and the lower mold 9 and the skin material 3
The molding of the multilayer molded article 1 is completed by integrating the resin molding 2 with the resin molding 2.

Thereafter, the upper mold 7 is raised, and the multilayer molded article 1 is taken out from between the upper mold 7 and the lower mold 9.

[0008]

However, in the conventional molding apparatus 10, when the molten resin 4 is injected between the lower mold 9 and the skin material 3, the displacement of the skin material 3 is surely ensured. In order to prevent this, a mechanism is provided to lift the skin material 3 by using the pins 13 and the slide mold 14 and to lightly contact the upper mold 7 forming surface 7a. Therefore, the molding device 10 becomes complicated and expensive, and the price of the multilayer molded product may increase.

Further, since it takes time to raise the pins 13 and the slide mold 14 to bring the skin material 3 into contact with the molding surface 7a of the upper mold 7, the time required for molding becomes longer.
For this reason, there is a possibility that the product cost will increase.

An object of the present invention is to provide a molding apparatus for a multilayer molded article in which the structure of the molding apparatus is simple and the cost of the product can be reduced. .

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a skin material is disposed between two relatively movable molds, and one of the two molds is provided. A molding apparatus for injecting a molten resin between a molding die and a skin material to obtain a multilayer molded product, wherein one of the molding dies faces a peripheral portion of the skin material and a peripheral portion of the skin material. Is provided with a wood grain groove for wood grain processing, and the one of the other molds is provided with a projection capable of grain graining the peripheral portion of the skin material by being inserted into the wood grain groove of the one mold, and At a predetermined position of the opening edge of the wood-groove groove formed in the one molding die, extending toward the other molding die, forming a ridge on the side covered with the skin material,
When the two molds relatively approach each other by a predetermined distance,
By the opening edge of the grained groove and the tip of the projection,
It is configured to hold a peripheral portion of the skin material.

According to a second aspect of the present invention, a skin material is disposed between two relatively movable molds, and a melting material is provided between any one of the two molds and the skin material. In a molding apparatus for obtaining a multilayer molded product by injecting a resin, one of the molding dies is provided with a wood grain groove which faces a peripheral part of the skin material and performs a wood grain processing on the peripheral part of the skin material. The other molding die is provided with a projection capable of graining the peripheral portion of the skin material by being inserted into the wood grain groove of the one molding die, and, among the side surfaces of the wood grain groove, the surface material is made of the skin material. A ridge for holding the skin material is formed on the side wall on the side to be covered, and when the two molds relatively approach each other by a predetermined distance, the opening edge of the wood cut groove and the tip of the projection are formed. , So as to hold the peripheral portion of the skin material It is the adult.

According to a third aspect of the present invention, the protrusion height of the projection is formed higher at a predetermined position, and the depth of the groove is formed deeper at a predetermined position corresponding to the height of the protrusion. Configuration.

In the present invention, cloth, PVC sheet, foamed PVC sheet, PVC sheet with polyethylene foam, etc. are used as the skin material.

Specifically, the cloth used is a cloth obtained by laminating urethane or compressed urethane having a density of 0.04 to 0.3 g / m 3 on the cloth.
With a knit, the thickness of PVC is 0.5-1.
The foamed PVC sheet has a thickness of 0. 0 mm and a knitted portion of 70 to 200 g / m3.
4 to 0.8 mm, the thickness of the foam layer is 1 to 4 mm, and the expansion ratio is 2 to 8 times. The PVC sheet with polyethylene foam has a PVC layer thickness of 0.4 to 0.5 mm.
8 mm, a polyethylene foam layer having a thickness of 2 to 5 mm which is 15 to 25 times foamed is used.

The dimensions of the wood-groove grooves formed in the one mold and the dimensions of the protrusions formed in the other mold and insertable into the wood grooves are determined when these two molds approach each other by a predetermined distance. The dimension that can hold the peripheral edge of the skin material is selected by the peripheral edge of the opening of the groove and the tip of the projection.

Here, to hold the peripheral portion of the skin member means that the inner peripheral portion of the peripheral portion of the skin material is slightly in contact with the peripheral portion of the opening of the groove, and the peripheral portion of the peripheral portion of the skin material is slightly protruding. It is in a state where it is inserted into the grained groove by the tip. That is, the peripheral portion of the skin material is bent from a portion in contact with the opening peripheral portion of the wood grain groove, and the outer peripheral end is inserted into the wood grain groove, and the skin material is formed by the elastic restoring force of itself. It is held by contacting the periphery of the opening and the tip of the projection.

After that, in a state where the peripheral portion of the skin material is held by the two molding dies by the peripheral edge of the opening of the wood grain groove and the tip of the projection, molten resin is injected between one molding die and the skin material. I do.

At the same time as or after the injection of the molten resin, the resin is pressed under a molding die to obtain a multilayer molded product.

Therefore, when injecting the molten resin,
Since the skin material is held by the two molds, the skin material is advantageously prevented from being displaced with respect to the mold. In this case, since a slide die or the like is not required to hold the skin material, the configuration of the molding apparatus is simplified, and no time is required to operate the slide die or the like, and the number of manufacturing steps is reduced. Because you can
Product cost can be advantageously reduced.

Further, by increasing the height of the projection at a predetermined position, the peripheral portion of the skin material can be held at a position where the relative approach distance between the two molds is large. Can be prevented from being deteriorated by the high-temperature molten resin when the molten resin is injected.

Further, by providing a ridge at the opening edge of the wood grain groove, it becomes possible to reduce the length of the peripheral part of the skin material inserted into the wood grain groove, and to reduce the depth of the wood grain groove. Therefore, the size of the protruding portion formed on the back surface of the multilayer molded product can be shortened by the grained groove, so that interference with other members can be advantageously prevented.

Further, by forming a ridge for holding the skin material on the side surface of the grained groove, the dimension between the projection and the side face of the grained groove can be substantially reduced (narrowed). It is convenient to apply different skin materials.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings as an embodiment applied to an apparatus for forming a multilayer molded product of an automobile door trim.

FIG. 13 is a perspective view of an automobile door trim. This door trim is a multilayer molded product 1 composed of a resin molding 2 and a skin material 3. A parting line 5 is formed on the surface of the door trim by covering the skin material 3 with the resin molding 2. The skin material 3 is grained on the thermoplastic resin molded body 2 on the line 5.

FIG. 1 is a sectional view of a molding apparatus 10 for molding the multilayer molded article 1, and FIG. 2 is an enlarged sectional view showing a main part of FIG. As shown in the figure, the molding apparatus 10 has two relatively movable molds, that is, an upper mold 7 and a lower mold 9. 7a and a molding surface 9a are formed. The skin material 3 can be arranged between the upper mold 7 and the lower mold 9. In this embodiment, the skin material 3 is arranged on the lower mold 9.

The lower die 9 is formed with a wood grain groove 17 which faces the peripheral part 3a of the skin material 3 and which performs wood grain processing on the peripheral edge part 3a of the skin material 3. The wood grain groove 17 has a rectangular cross section. And has a uniform groove width and a uniform depth. A step S for facilitating the positioning of the skin material 3 is formed on the molding surface 9 a at the portion where the wood groove 17 is formed. Also, the molding surface 9a of the lower die 9
A passage 6 for injecting the molten resin is opened at a substantially central portion of.

On the molding surface 7a of the upper die 7, the lower die 9
Of the skin material 3 by being inserted into the wood grain groove 17.
Is provided with a protrusion 15 capable of performing a graining process on the peripheral portion 3a. The protrusion 15 is formed at a position corresponding to the parting line 5 shown in FIG. 13 with a substantially uniform protruding height.

Here, the protrusion height h of the projection 15 formed on the upper mold 7 is determined when the upper mold 7 descends and the upper mold 7 and the lower mold 9 relatively approach each other by a predetermined distance (the molten resin is injected). 2A), as shown in FIG. 2A, the peripheral portion 3a of the skin material 3 is formed by the tip 16 of the projection 15 of the upper die 7 and the opening edge 18 of the wood groove 17 of the lower die 9. Is set to a height that can hold. The depth and width of the wood grain groove 17 formed in the lower mold 9 are set such that the molten resin is injected on the back side of the skin material 3, that is, between the skin material 3 and the lower mold 9. After being pressed and molded by the mold 7 and the lower mold 9, the size of the skin material 3 is set to the grain size of the resin molded body 2 as shown in FIG. 2B.

Specifically, assuming that the plate thickness of the multilayer molded article 1 is t, and the gap (mold clearance) between the upper mold 7 and the lower mold 9 at the molten resin injection position is c, the mold clearance c is It is adjusted within the range of 0 <c ≦ 15 mm depending on the type of the material. Preferably, when t = 2.5 mm, c = 2.5 m
A dimension of m is selected. Further, the dimension h 'from the molding surface 7a of the upper mold 7 to the bottom of the wood grain groove 17 after pressing the molten resin has a relationship of h'> h≥t + c.

Next, a method for molding the multilayer molded article 1 using the molding apparatus 10 having the above configuration will be described. The molding of the multilayer molded article 1 is performed by opening the mold, starting the lowering of the upper mold, temporarily stopping the upper mold, injecting the molten resin, starting the lowering of the upper mold, and starting the mold as shown in the time chart of the molding process shown in FIG. It is performed according to the steps of closing, cooling / solidification, start of upper die rising, and completion of upper die raising.

First, at the opening position, the skin material 3 cut to a predetermined size is placed on the molding surface 9a of the lower die 9.
In this case, the skin material 3 is arranged so that its surface side faces the upper mold 7 side, and the step S provided on the molding surface 9a of the lower mold 9 is formed.
Accordingly, the peripheral portion 3a is arranged so as to face the grained groove 17 (arrangement step).

Next, the upper die 7 is lowered from the upper die lowering start position, and temporarily stopped at a predetermined position, that is, an upper die temporary stop position where the die clearance has the dimension C.

At the upper mold temporary stop position, the protrusion 15 formed on the upper mold 7 is inserted into the wood groove 17 formed on the lower mold 9, and the end 16 of the protrusion 15 and the opening periphery 18 of the wood groove 17 are formed. Thereby, the peripheral portion 3a of the skin material 3 is held (holding step, see FIG. 2A).

After the peripheral edge 3a of the skin material 3 is held, the molten resin is injected between the skin material 3 and the lower mold 9 through the passage 6 (injection step).

After the injection step, the upper mold 7 is lowered again from the upper mold re-starting position to the closed mold position where the mold clearance becomes zero, and the skin material 3 and the molten resin are pressed (the molding step, FIG. 2 (b)). This state in which the mold clearance is zero is maintained until the upper mold starts to rise, and the injected molten resin is solidified and cooled.

After a lapse of a predetermined time from the closed mold position, the upper mold 7 starts to rise from the upper mold rising start position, and returns to the open state at the upper mold rising completion position. In this open state, the multilayer molded article 1 is taken out of the upper mold 7 and the lower mold 9.

The injection of the molten resin is not necessarily performed by the upper mold 7.
It is not necessary to temporarily stop the lowering operation of the upper die 7 as shown in FIG. 4, and immediately before the upper die 7 approaches the lower die 9 to a predetermined distance (die clearance C), the lowering speed of the upper die 7 is reduced.
In a deceleration state, the molten resin may be injected and pressed.

Therefore, when injecting the molten resin,
Since the skin material 3 is held by the two molds of the upper mold 7 and the lower mold 9, the displacement of the skin material 3 with respect to the molds 7 and 9 is advantageously prevented. In this case, since a slide mold or the like is not required to hold the skin material 3, the configuration of the molding apparatus 10 is simplified, and
Since the operation time of the slide die or the like is not required and the number of manufacturing steps can be reduced, the cost of the product can be advantageously reduced.

In addition, according to the present invention, not only a multilayer molded product in which the wood grain groove is linear, but as shown in FIG.
Are arranged in an island shape at a substantially central portion of the resin molded body 2, and the present invention can also be applied to a product in which a grained groove has a continuous curve.

FIGS. 6 and 7 show another embodiment of the present invention. This embodiment is different from the above-described embodiment in that the height of the projection 15 formed on the upper die 7 is different from that of the first embodiment. Is formed high at a predetermined position to form a tall protrusion 19, and the depth of the wood-groove groove 17 is increased.
This is a point that a deep groove 21 is formed at a predetermined position corresponding to the above.

With this configuration, the tall projections 19 can hold the peripheral portion 3a of the skin material 3 at a position where the relative distance between the upper mold 7 and the lower mold 9 is relatively large, that is, the mold clearance is wide. Thereby, in addition to obtaining the same effects as described in the above embodiment, the distance between the skin material 3 and the lower mold 9 is made sufficiently large, that is, the molten resin passage 6 is formed.
And the space between the skin material 3 can be increased. Therefore, since the time required for the molten resin to reach the skin material 3 is prolonged, the molten resin is cooled. Therefore, it is possible to prevent the skin material 3 from being deteriorated by the high-temperature molten resin when the molten resin is injected. it can.

In this case, since the deep groove 21 is formed in a part of the wood grain groove 17, a protruding portion by the deep groove 21 is formed on the back side of the product after the molding process, and this protruding portion is formed. Interference with a mating member, for example, an inner panel can be considered, but this can be easily solved by forming the tall protrusion 19 and the deep groove 21 at predetermined positions where interference can be avoided.

Although the tall protrusion 19 makes it possible to hold the peripheral portion 3a of the skin material 3 at a position where the mold clearance is large, the upper die 7 is further lowered while holding the skin material 3. Since it is optional to inject the molten resin, after all, using a single mold having the tall projections 19, the molding operation is performed using not only the skin material having low heat resistance but also various skin materials. It is possible.

As shown in FIGS. 8 and 9, in this embodiment, in the above-described embodiment, a predetermined position of the opening edge portion 18 of the wood groove 17 formed in the lower die 9 is further provided.
The point is that a ridge 22 extending toward the upper mold 7 is formed. That is, the protruding ridges 22 are formed on the opening edge portions 18 of the grained grooves 17 on the side covered with the skin material 3.

With this configuration, the wood grain groove 17
Since the length of the peripheral portion 3a of the skin material 3 inserted into the inside can be shortened, the depth of the groove 17 can be reduced. Therefore, the size of the protrusion formed on the back side surface of the multilayer molded article 1 can be reduced by the wood grain groove 17, and it is possible to advantageously prevent the protrusion from interfering with other members such as the inner panel.

The ridges 22 can be formed not only on a part of the opening edge 18 of the groove 17 as shown in FIG. 8, but also on the entire area of the opening edge 18.

FIGS. 10 and 11 show another embodiment according to the present invention. This embodiment is different from the above-described embodiment in that a skin of a wood grain groove 17 formed in the lower die 9 is provided. The point is that a ridge 23 for holding the skin material 3 is formed on the side wall on the side covered with the material 3.

With this configuration, the dimension between the projection 15 and the side surface of the wood grain groove 17 can be substantially reduced. Therefore, when the skin material 3 having a small thickness is applied, a predetermined holding force can be obtained. Can be held.

When a skin material having a small thickness is applied, as shown in FIG.
May be deviated in the width direction of the wood grain groove 17 so that the dimension a from the side surface of the wood grain groove to the projection on the side where the skin material 3 is arranged is smaller than the dimension b on the opposite side.

[0051]

As described above in detail, according to the present invention, when the molten resin is injected, the skin material is held by the two molds, so that the skin material is shifted with respect to the mold. Is advantageously prevented. In this case,
Since a slide die or the like is not required to hold the skin material, the configuration of the molding device is simplified, and the time required for operating the slide die or the like is not required, and the number of manufacturing steps can be reduced. In addition, a reduction in product cost can be advantageously achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an apparatus for forming a multilayer molded product according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of FIG. 1, and is a cross-sectional view (a) of a holding step of holding a peripheral portion of a skin material and a cross-sectional view (b) of a molding step.

FIG. 3 is a time chart of a molding step.

FIG. 4 is a time chart of a molding step showing another embodiment.

FIG. 5 is a perspective view of a door trim.

FIG. 6 is a perspective view of a projection showing another embodiment of the present invention.

FIGS. 7A and 7B are enlarged cross-sectional views showing a wood-groove portion of the molding apparatus to which the protrusion shown in FIG. 6 is applied, wherein FIG. 7A is a cross-sectional view along the longitudinal direction of the protrusion, and FIG. XX of a)
It is a line sectional view.

FIG. 8 is a perspective view showing the vicinity of a wood grain groove of the lower mold in the embodiment according to the present invention.

9 is a sectional view of the embodiment shown in FIG. 8, which is similar to FIG.

FIG. 10 is a perspective view showing the vicinity of a lower-groove groove, showing another embodiment according to the present invention.

11 is a sectional view of the embodiment shown in FIG. 10, and FIG.
It is a drawing similar to (a).

FIG. 12 is a sectional view showing still another embodiment of the present invention, and is a drawing similar to FIG. 2 (a).

FIG. 13 is a perspective view of a door trim including a multilayer molded product.

FIG. 14 is a cross-sectional view of a conventional molding apparatus for a multilayer molded product, in which a drawing (a) showing a state in which a skin material is arranged on a lower mold, a drawing (b) showing a state in which a molten resin is injected, It is drawing (c) which shows the state which was pressed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-layer molded product 2 Resin molded object 3 Skin material 3a Peripheral edge 7 Upper die (molding die) 9 Lower die (molding die) 15 Projection 16 Tip part 17 Wood grain groove 18 Opening edge

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-195433 (JP, A) JP-A-8-118413 (JP, A) JP-A-7-164481 (JP, A) JP-A-9-199 254119 (JP, A) JP-A-8-290441 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45/84

Claims (3)

(57) [Claims] 1. A multi-layer molded product in which a skin material is disposed between two relatively movable molds, and a molten resin is injected between one of the two molds and the skin material. In one of the molding dies, the one of the molding dies faces a peripheral portion of the skin material, and is provided with a grain-groove groove for graining the peripheral portion of the skin material. A protrusion capable of graining the peripheral portion of the skin material by being inserted into the grain groove of the one mold is provided , and an opening edge of the grain groove formed in the one mold is provided .
At a predetermined position of the part, extending toward the other mold,
A ridge is formed on the side covered with the skin material, and when the two molds relatively approach each other by a predetermined distance,
By the opening edge of the grained groove and the tip of the projection,
An apparatus for forming a multilayer molded product, wherein a peripheral portion of the skin material is held. 2. A skin between two relatively movable molds.
The material is arranged, and one of the two molds is
Injection of molten resin between skin material to obtain multilayer molded product
In the molding apparatus, one of the molding dies faces a peripheral portion of the skin material.
And a grained groove for graining the periphery of the skin material.
A wood grain of the one mold is provided on the other mold.
The peripheral edge of the skin material is inserted into the
Providing projections that can be subjected to scoring , and covering the side surfaces of the wood- cut grooves with a skin material
On the side wall on the side, a ridge that holds the skin material is not formed.
When the two molds relatively approach each other by a predetermined distance,
By the opening edge of the grained groove and the tip of the projection,
Characterized in that the peripheral portion of the skin material is held.
Multi-layer molded article of the molding apparatus to be. 3. The projection height of the projection is high at a predetermined position.
The depth of the wood grain groove matches the height of the protrusion.
3. The method according to claim 1, wherein the second member is formed deeply at a predetermined position.
A molding apparatus for the multilayer molded article according to the above .