JPH07205167A - Skin fixing device in integral molding of skin - Google Patents

Abstract

PURPOSE:To provide a skin fixing device dispensing with the formation of a slide pin inserting retaining hole or a dowel retaining cavity to a skin and temporarily fixing the skin to a lower mold easily and certainly in the integral molding of the skin. CONSTITUTION:The operation shafts 10 of actuators A are vertically provided to the peripheral edge part of an upper mold 2 and allowed to advance toward the peripheral edge part of a lower mold 1 at the time of mold opening. These operation shafts 10 fall at the time of mold clamping to fix the peripheral edge part 14 of the skin 5 set to the lower mold 1 and receives pressure from the lower mold 1 accompanied by mold clamping operation to retreat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for temporarily fixing a skin to a lower mold when a skin is integrally formed with a base material or a foam by press molding, foam-in-skin integral foam molding or the like.

[0002]

2. Description of the Related Art Conventionally, for interior materials for vehicles (pillar garnish, instrument panel, etc.), a surface of a base material having a predetermined rigidity is pasted with a skin by press molding, or a foamed resin body having a high cushioning property is used. It has been made by integrally foaming the skin.

For example, a pillar garnish crimping mold for adhering a surface skin to a substrate is as shown in FIG. In the figure, reference numeral 1 is a lower mold, reference numeral 2 is an upper mold, and reference numeral 3 is an upper mold 2.
The reference numeral 5 indicates a skin, which is a base material set on the mold surface. As a fixing device for the outer skin 5, a slide pin 4 is provided in a peripheral portion of the lower mold 1 so as to be retractable and retractable, and a stopper hole 2 is previously provided in the peripheral portion of the outer skin 5.
1 is open. The outer skin 5 is set on the lower mold 1 by inserting the slide pin 4 into the stop hole 21. This determines the position of the epidermis 5. Then, the base material 3 coated with the adhesive is attached to the upper mold 1, and the upper mold 1 is lowered to press-bond the skin 5 and the base material 3 to be integrated.
During such pressure bonding, the slide pin 4 suppresses the displacement of the skin 5. After crimping, the slide pin 4 is retracted to pull out the pin 4 from the stop hole 21 so that the edge of the skin 5 is the base material 3.
I am trying to get involved. As described above, the slide pin 4 plays a role of positioning and fixing the outer skin 5, and contributes to prevention of displacement of the outer skin 5 during pressure bonding.

Further, FIG. 6 shows a state in which an instrument panel skin is placed on a lower mold in a foam molding die in which the skin 5 and the foam are integrated. As a fixing device for the outer skin 5, dowels 7 are provided on the upper surface of the peripheral edge of the lower mold 1 at appropriate intervals. On the other hand, a dent 22 that matches the dowel 7 is formed in advance on the peripheral edge of the skin 5, and is fixed so that the skin 5 does not shift. Then, the liquid foaming raw material is injected into the epidermis 5 to form the epidermis 5
The desired product is produced by performing foam molding integrally with the above.

[0005]

However, the above-mentioned conventional apparatus for fixing the skin in the integral molding of the skin has the following problems. First, slide pin 4 or dowel 7
I had to fit the epidermis 5 into it, and I had to work on the set. It took about 25 seconds for the pillar garnish and about 30 seconds for the instrument panel each time it was set, which served as a brake for improving productivity. With respect to the dowel 7, there was also a troublesome problem that the epidermis 5 had to be removed from the dowel 7 after demolding. Further, the outer skin 5 had to be formed with a stop hole 21 into which the slide pin 4 is inserted and a recess 22 into which the dowel 7 is fitted. in addition,
In the fixing device described above, even if the molding shrinkage of the skin 5 and the like partially occur, it is difficult to set. It may be impossible to set the skin on the slide pin 4 and the dowel 7.
It was also a cause of increasing the defective rate of the epidermis 5.

The present invention solves the above-mentioned problems, and in the integral molding of the skin, not only the slide pin insertion hole and the dowel stopping recess are not required in the skin, but also the skin for the lower mold of the molding die is formed. It is an object of the present invention to provide a device for fixing an epidermis that facilitates and secures temporary fixing of the skin.

[0007]

A device for fixing a skin in a skin integral molding according to the first aspect of the present invention is such that a working shaft of an actuator is vertically provided at a peripheral portion of an upper mold of a molding die and the working shaft is opened when the mold is opened. The work shaft is advanced to the peripheral part of the lower mold, and when the mold closes, the peripheral part of the epidermis set on the lower mold descends when the mold is closed, and the peripheral part of the skin is fixed by sandwiching it with the lower mold. It is characterized in that it is adapted to retreat according to the pressure received from the lower mold. Here, the "actuator" refers to a pneumatic cylinder or a hydraulic cylinder.

The apparatus for fixing the skin in the integral molding of the skin according to the second aspect of the present invention is the same as the first aspect of the present invention, wherein a pneumatic cylinder is used as the actuator, and a relief valve whose set pressure is adjustable is provided in the air pipe of the pneumatic cylinder. During the process of retracting the working shaft due to mold closing, the pneumatic cylinder receives pressure from the lower mold via the working shaft, the air valve's increased air pressure causes the relief valve to open, and It is characterized in that the clamping pressure can be adjusted.

[0009]

[Operation] Since the operating shaft of the actuator attached to the upper die is advanced to the peripheral portion of the lower die, the operating shaft clamps the peripheral portion of the epidermis between the lower die and the operating shaft when the die is closed, and Fix with nature. This clamping pressure depends on the pressure that the actuator receives from the lower mold via the actuating shaft when the mold is closed, so that the epidermis can be reliably fixed at an appropriate clamping pressure. Further, when a pneumatic cylinder is used as the actuator and a relief valve is provided in the air pipe to set the pressure, the clamping pressure can be adjusted without changing from the beginning to the end of the mold closing operation.

[0010]

EXAMPLES The present invention will be described in detail below based on examples. (1) Structure of a device for fixing a skin in integral molding of a skin FIGS. 1 to 4 show an embodiment of a device for fixing a skin in the integral molding of a skin according to the present invention. It is applied to pressure molding for making a pillar garnish. 1 is a vertical cross-sectional view of a device for fixing a skin in integral molding of a skin, FIG. 2 is a pneumatic circuit diagram relating to the pneumatic cylinder of FIG. 1, FIG. 3 is an operation state diagram of the device for fixing a skin according to FIG. 1, and FIG. FIG. 3 is a vertical cross-sectional view of the working shaft tip of the pneumatic cylinder and the lower die peripheral portion.

Reference numeral 1 is a lower mold, and reference numeral 2 is an upper mold. The lower mold 1 has a concave cross section. The outer surface of the lower mold 1 has a skin 5
When set in the lower mold 1 (described later), a receiving surface 23 that supports the epidermis 5 is formed (FIG. 4). A movable plate 8 which can be raised and lowered is integrated with the upper mold 2 so that the upper mold 2 faces the lower mold 1. The upper mold 2 has a convex cross-section that fits into the lower mold 1, and the upper mold 2 is closed to produce a product.

Reference numeral 3 indicates a base material formed into a predetermined shape by press molding, injection molding or the like. Here, after the adhesive is applied to the front surface and the back surface of the edge of the base material 3, the adhesive is applied to the upper mold 2
Set to. Depending on the type of adhesive, the solvent may be evaporated after applying the adhesive, and then the base material 3 may be set in the upper mold 2. Further, depending on the shape of the base material 3, the adhesive may be applied after the base material 3 is set on the upper mold 2. Epidermis 5
In the case where is made of a material in which the adhesive hardly penetrates, the adhesive can be applied to the skin 5.

The skin 5 is formed into a predetermined shape by vacuum forming, sewing or the like. Considering applications, touch, decoration, etc.,
A plastic leather, a fabric, or a laminated skin to which an elastic sheet material is attached is appropriately selected. Epidermis 5
Is larger (wider) than the base material 3, and its peripheral edge portion 14 is placed on the receiving surface 23 of the lower mold 1.

Reference numeral 9 indicates a pneumatic cylinder as the actuator A. Pneumatic cylinder 9 is cylinder tube 2
It consists of 0 and an operating shaft 10 which moves back and forth. The operating shaft 10 is opposed to the peripheral portion of the lower mold 1, and the cylinder tube 20 is fixed to the peripheral portion of the upper mold 2 so as to extend vertically. Operating shaft 10
Moves downward by operating a piston at the base end of the operating shaft with compressed air flowing through an air pipe 11 from an air pressure source (not shown) (FIG. 2). The air pipe 11 is provided with a relief valve 12 capable of adjusting the set pressure by a dial operation. Reference numeral 13 indicates a pressure gauge for displaying the air pressure applied to the pneumatic cylinder 9.

Air is sent from an air pressure source to an air pressure cylinder 9 through an air pipe 11 so that the operating shaft 10 is moved to the lower mold 1.
Is being advanced to the peripheral part of. The tip of the operating shaft 10 is located 20 mm or more below the lower position of the substrate 3. Then, in this state, the movable plate 8 is lowered to close the mold. Therefore, before closing the mold, first, the operating shaft 10
The tip end of the outer mold 5 and the lower die 1 sandwich the peripheral edge portion 14 of the outer skin 5, and the outer skin 5 is fixed by the air pressure in the pneumatic cylinder 9. Even when the mold is closed, the operating shaft 10 keeps the protruding state to fix the skin 5 (FIG. 3).

The actuating shaft 10 receives the reaction force from the lower mold as the mold is closed and retracts. Therefore, the air in the pneumatic cylinder 9 is compressed and the pressure is increased. However, if the air pressure in the air pipe 11 rises to ² to 4 kg / cm ² and the air pressure exceeds the set pressure of the relief valve 12, the relief valve 1
The second ventilation hole is opened so that the air in the cylinder is discharged to the atmosphere. Therefore, the pressure sandwiched by the peripheral edge of the skin of the actuating shaft 10 can be kept substantially constant from the beginning to the end of the mold closing operation, and the air cylinder 9 can act as a resistance against the mold closing and damage the skin 5. There is no.

The relief valve 12 can freely adjust the clamping pressure of the skin 5 by the actuating shaft 10 by appropriately adjusting the pressure setting. Therefore, there is no possibility that the outer skin 5 will be damaged by being applied with excessive pressure, or conversely, it will be displaced due to insufficient clamping force. Optimum pressure adjustment is always possible according to the properties of the epidermis 5.

The required number of pneumatic cylinders 9 are provided in the peripheral portion of the upper mold 2 according to the size of the skin (FIG. 2). By the way, it is preferable that the tip end of the operating shaft 10 of the pneumatic cylinder 9 is formed with a spherically rounded protrusion 19 as illustrated in FIG. Further, it is preferable to provide a spherical recess 15 on the surface of the lower mold 1 facing the lower mold 1. This is because when the operating shaft 10 hits the skin 5, the skin 5 is recessed in the recess 15 and is reliably locked, and the skin 5 does not slip. It is also possible to replace the tip of the operating shaft 10 with a conical or wedge-shaped locking portion. In either case, it is possible to prevent positional displacement when the skin 5 is clamped. It is more preferable to provide the lower mold 1 with a recess corresponding to the locking portion. Further, although not shown, a pad or an edge or the like may be provided at the tip of the actuating shaft 10 for preventing slippage to be pressed against the skin 5.

(2) Operation of the device for fixing the skin in integral molding of the skin Next, the operation of the device for fixing the skin will be described in the pressure-bonding molding process. First, the skin 5 is placed on the lower mold 1 when the mold is opened. Here, it is not necessary for the skin 5 to have the recess 22 fitted in the dowel 7 or the stopper hole 21 fitted in the slide pin 4 (see FIGS. 5 and 6). Then, the base material 3 coated with the adhesive is set in the upper mold 2. At this stage, the operating shaft 1
The tip of 0 is positioned below the lower position of the base material 3 (FIG. 1).

In this way, the upper die 2 is lowered when the preparation for pressure-bonding molding is completed. With the lowering of the upper mold 2, first,
The operating shaft 10 comes into contact with the peripheral edge portion 14 of the skin 5 placed on the lower mold 1. The skin 5 is sandwiched between the lower mold 1 and the operating shaft 10,
It becomes fixed. Therefore, it is possible to prevent the epidermis 5 from shifting in the mold closing stage. When the mold closing progresses, the operating shaft 10 receives the pressure from the lower mold 1 and retreats. The pressure for sandwiching the skin 5 is the pressure received from the lower mold 1 via the actuating shaft 10, and thus is a desired sandwiching pressure. When the mold closing state further progresses and the pressure in the pneumatic piping 11 increases, the relief valve 1
2 is opened and pressure is adjusted. This is because the operating shaft 10 is not allowed to function as a resistor for closing the mold while the outer skin 5 is securely sandwiched by keeping the outer skin 5 sandwiching pressure constant.

When the mold closing is completed, the skin 5 and the base material 3 are integrated by pressure molding. In this state, the actuating shaft 10 keeps its tip protruding so that the skin 5 can be continuously clamped with the lower mold 1 (FIG. 3). Thus, the integral skin-molded product is completed by pressure molding. After that, the mold is opened and the desired product is taken out. In the process of opening the mold, the operating shaft 10 is released from the pressing force of the lower mold 1, moves downward again, and returns to the next stand-by state for integral skin molding. In this way, continuous production is possible.

(3) Effect of the Embodiment According to the outer skin fixing device in the outer skin integral molding having the above-described aspect, the operating shaft 10 clamps the peripheral edge portion 14 of the outer skin 5 with the lower mold 1 by the mold closing motion. , The epidermis 5 can be naturally fixed without any special operation. Since the clamping pressure depends on the pressure received by the pneumatic cylinder 9 from the lower mold 1 through the actuating shaft 10 when the pneumatic cylinder 9 is closed, the clamping pressure does not fluctuate and a proper clamping force is always applied to the skin 5 without forming a stop hole or the like. The epidermis 5 can be securely fixed by the attachment pressure. By providing the projection 19 at the tip of the actuating shaft 10 and the recess 15 on the facing surface of the lower mold 1, it is possible to further improve the reliability of fixing the skin 5.

By fixing the outer skin 5 as described above, fitting into the slide pin 4 and the dowel 7 is eliminated, and
Productivity is greatly improved. Further, the skin can be integrated with the base material without causing misalignment or wrinkling, and the number of processing steps can be reduced to facilitate the production, so that the quality of the product can be improved and the cost can be reduced. Of course, since the dowel shape was avoided, the degree of adhesion to the lower mold 1 of the skin 5 was good,
Stable quality can be obtained. In addition, even if molding shrinkage or the like occurs in the epidermis 5, there is not much trouble in setting the epidermis, and the defective rate of the epidermis 5 tends to be reduced. It is also possible to save the trouble of annealing the skin 5 to remove the internal strain. Then, there is a beneficial effect such that automatic demolding may be possible.

The present invention is not limited to those shown in the above embodiments, but can be variously modified within the scope of the present invention depending on the purpose and application. For example, it can be applied as an apparatus used for producing a foamed resin molded article with a skin in which the outer surface of a foam is covered with a skin.

[0025]

As described above, the apparatus for fixing the skin in the integral molding of the skin according to the present invention facilitates and secures the temporary fixing of the skin to the lower mold of the molding die, thus improving the productivity. Excellent effect for cost reduction.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an epidermal fixing device showing an embodiment of the present invention.

FIG. 2 is a pneumatic circuit diagram of the pneumatic cylinder of FIG.

FIG. 3 is an operation state diagram of the epidermis fixing device according to FIG. 1;

FIG. 4 is a vertical cross-sectional view of a tip of an operating shaft of a pneumatic cylinder and a peripheral portion of a lower mold.

FIG. 5 is an explanatory sectional view of a conventional technique.

FIG. 6 is an explanatory sectional view of a conventional technique.

[Explanation of symbols]

 1 Lower mold 2 Upper mold 5 Skin 9 Pneumatic cylinder 10 Operating shaft 11 Air piping 12 Relief valve 14 Peripheral part A Actuator

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Claims (2)

[Claims] 1. An operating shaft of an actuator is vertically provided on a peripheral portion of an upper die of a molding die, the operating shaft is advanced to a peripheral portion of a lower die when the die is opened, and the operating shaft is lowered when the die is closed. Then, the peripheral edge of the epidermis set on the lower die is fixed by sandwiching it with the lower die, and the epidermis is fixed by the integral molding of the epidermis so that it is retracted by the pressure received from the lower die when the die is closed. apparatus. 2. A pneumatic cylinder is used as an actuator, a relief valve capable of adjusting a set pressure is provided in an air pipe of the pneumatic cylinder, and a pneumatic valve is provided in the process of retracting the working shaft when the mold is closed. The skin according to claim 1, wherein the cylinder receives pressure from a lower mold via an actuating shaft, and the relief valve is opened by increasing the air pressure of the air pipe to adjust the clamping pressure at the peripheral edge of the skin. Device for fixing the skin in one-piece molding.