JP2001096571A - Method for molding resin molded article having skin layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a resin molded article having a skin layer excellent in appearance by setting a skin sheet between the molds of a mold apparatus as it is without shaping the same. SOLUTION: A skin sheet 31 is set between the fixed mold 22 and movable mold 23 of a mold apparatus 21 in a loosely clamped state to be temporarily fastened on the recessed part 41 of the slide core 26 on the side of the fixed mold 22 by a temporary fastening core 40. Then, a burr cutting slide core 37 is moved toward the fixed mold 22 to perform mold clamping. In this state, a plasticized resin material is injected and charged in the cavity 36 formed between the molds 22, 23 by a stamping molding method through a pot 27a. By this method, a base material is integrally molded on the rear side of the skin sheet 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a resin molded article having a skin layer such as a console lid of a console box mounted on a vehicle such as a vehicle, a ship or an aircraft, or an interior trim. .

[0002]

2. Description of the Related Art Conventionally, as a resin molded product having a skin layer of this type, for example, an interior trim such as a console lid of a console box or a door trim has been known, for example, a product mounted on a vehicle. Hereinafter, among these, a console lid will be described as an example. The console lid has a box-shaped base material and a skin layer mounted on the base material. The base material is formed of a hard resin material such as reinforced polypropylene reinforced with a filler such as glass fiber. The skin layer is composed of an outer layer made of, for example, polyvinyl chloride, and an inner layer made of foamed polypropylene which is joined and arranged inside the outer layer.

[0003] As a method of molding such a resin molded article having a skin layer such as a console lid, for example, FIG.
A technique as shown in FIG. 20 has been conventionally proposed. That is, the mold apparatus 61 used in the first conventional method shown in FIG. 19 includes a fixed mold 62, a movable mold 63, and a slide core 64 provided on the movable mold 63.

In the first conventional method, a skin sheet is formed in advance into a substantially box shape by vacuum forming or the like to form a shaped skin 65 for forming a skin layer. The skin 65 is set along the molding surface of the movable mold 63. In this state, the movable mold 63 is clamped to the fixed mold 62 side, so that the shaped skin 65 is arranged in the cavity 66 formed between the molds 62 and 63.

In this state, the slide core 64 is moved inward, that is, toward the fixed mold 62, and the shaped skin 65 is strongly pressed against the molding surface of the fixed mold 62 by the burr cut portion 64 a at the edge of the slide core 64. Here, when the base material 67 is formed, a resin material such as polypropylene injected in a plasticized state on the back surface side of the skin sheet 72 leaks from the cavity 66 to the fixed mold 62 side, so-called burrs are formed. Need to be controlled. For this reason, the burr cutting portion 64a
Has a substantially rectangular cross section, that is, a so-called pin angle shape.

Thereafter, a plasticized resin material such as polypropylene is injected into the cavity 66 from the gate 68 of the fixed mold 62. Then, the base material 67 is placed in the mold device 61.
By sufficiently cooling the inside of the console lid 7, a skin layer 69 is formed on the shaped skin 65, and a base material 67 is integrally formed on the back side of the skin layer 69.
0 is molded.

On the other hand, in the second conventional method shown in FIG.
Mold device 61 including movable die 63 and slide core 64
Use In the second conventional method, a mold apparatus 61 in which a plurality of set pins 71 are provided on a fixed mold 62 is provided.
Use By inserting a sheet-shaped skin sheet 72 for forming a skin layer into set pins 71 on the fixed mold 62 at set holes provided at four corners thereof,
The skin sheet 72 is set between the fixed mold 62 and the movable mold 63.

In this state, when the movable mold 63 is clamped to the fixed mold 62 side, the skin sheet 72 is pushed into the cavity 66 formed between the molds 62 and 63 by the fixed mold 62 and pulled toward the center. It is arranged in the state where it was done. Thereafter, a plasticized resin material such as polypropylene is injected from the gate 68 of the fixed mold 62 to the back side of the skin sheet 72. Thereby, the skin sheet 72 is further pushed into contact with the molding surfaces of the movable mold 63 and the slide core 64, and the cavity 66 is filled with the skin sheet 72 and the resin material.

Then, a skin layer 69 is formed in a predetermined shape along the forming surface, and a base material 67 is integrally formed on the back side of the skin layer 69. Next, by sufficiently cooling the base material 67 in the mold apparatus 61,
The console lid 70 is formed. According to the second conventional method, the console lid 70 having a predetermined shape having the skin layer 69 can be formed by setting the skin sheet 72 in the mold apparatus 61 without shaping in advance.

[0010]

However, the conventional method for molding a resin molded article as described above has the following problems.

That is, in the first conventional method, before forming the console lid 70, it is necessary to pre-shape the skin sheet into the shaped skin 65 having a predetermined shape by vacuum forming or the like. That is, a plurality of molding operations are required in the molding process of the console lid 70, and the console lid 70 has a problem that the number of manufacturing steps is large and the manufacturing cost is increased.

On the other hand, in the second conventional method, the skin sheet 7
Set pin 7 as it is without forming 2
According to 1, the console lid 70 is set between the two dies 62 and 63 and molded. For this reason, although the problem in the first conventional method is solved, the following new problem arises, and the product console lid 7 is removed.
However, there has been a problem that the yield of 0 is reduced, and as a result, a large reduction in manufacturing cost cannot be expected.

That is, in the second conventional method, the movable die 6
When the mold 3 is clamped to the fixed mold 62 and when the cavity 66 is filled with the resin material, the skin sheet 72 is pulled toward the center. The pulling causes the skin sheet 72 to be torn at the set hole where the set pin 71 is inserted. And the tear is the console lid 70
Over the outer surface of the skin layer 69 of the
However, there is a problem that the appearance may be significantly impaired.

Further, the mold apparatus 6 used in the second conventional method is used.
In 1, the slide core 64 is divided and formed. After the movable mold 63 is clamped to the fixed mold 62 side, the slide core 64 is moved inward to hold the skin sheet 72 between the slide core 64 and the fixed mold. For this reason, the skin sheet 72 may be sandwiched between the butted portions of the slide cores 64 that are formed separately, and the skin layer 69 of the console lid 70 may be sandwiched and wrinkled. There is a problem that the appearance of the console lid 70 may be significantly impaired due to the occurrence of such pinching wrinkles.

Further, when the slide core 64 is moved inward, the skin sheet 72 held in a tensioned state is further pulled toward the portion corresponding to the slide core 64, and the skin sheet 72 is moved to the portion corresponding to the set hole. There is a possibility that the tearing in may be enlarged. Further, there is a problem that the skin sheet 72 may be broken at a corresponding portion of the slide core 64 or the like.

Further, in the second conventional configuration, when the resin material for the base material 67 is injected onto the back side of the skin sheet 72,
The skin sheet 72 is strongly pressed against the fixed mold 62 by the burr cut portion 64a having a pin-shaped edge.
Then, when the molded console lid 70 is removed from the mold apparatus 61 after cooling the injected resin material, the skin layer 69 may be deformed so as to return to the center side due to distortion during molding and the like. . When such a deformation of the skin layer 69 occurs, a linear mark, a so-called burr cut line, is exposed on the outer surface of the skin layer 69 of the console lid 70. For this reason, there is a problem that the appearance of the console lid 70 may be significantly impaired.

The present invention has been made by paying attention to such problems existing in the prior art. The object is to form a resin having a skin layer capable of forming a resin molded article having a skin layer with an excellent appearance by setting the skin sheet between molds of a mold apparatus as it is without shaping the skin sheet. An object of the present invention is to provide a molding method of a molded article. In particular, it is an object of the present invention to provide a method for molding a resin molded article having a skin layer capable of suppressing generation of tears, pinch wrinkles, and exposure of burr cut lines on the outer surface of the skin layer.

[0018]

According to the first aspect of the present invention, a skin sheet is set in a loose clamp state between a fixed mold and a movable mold of a mold apparatus. After closing the movable mold to the fixed mold side, placing the skin sheet in the cavity formed between those molds, injecting the resin material into the cavity, integrally molding the base material on the back side of the skin sheet It is characterized by doing.

[0019] Therefore, when the movable sheet is set between the molds of the mold apparatus and the movable mold is clamped to the fixed mold, and when the resin material is injected into the back side of the skin sheet, etc. When a tensile force exceeding a predetermined value acts on the loose clamp portion of the skin sheet toward the center side, the loose clamp portion slides. Thus, even if the skin sheet is set between the molds of the mold apparatus without being shaped, the tear of the skin sheet due to the tensile force can be suppressed.

According to a second aspect of the present invention, in the first aspect of the invention, as the skin sheet, a high elastic backing material joined to the back surface of the skin material is used. is there.

For this reason, the skin sheet itself is easily extended, and even if a tensile force acts on the skin sheet toward the center, a part of the tensile force is reduced by the extension of the skin sheet itself.

According to the third aspect of the invention, the skin sheet is set between the fixed mold of the mold apparatus and the movable mold having the slide core, and the movable mold is suppressed from being pinched by the fixed mold. After closing the mold while placing the skin sheet in the cavity formed between the molds, injecting a resin material into the cavity and integrally molding the base material on the back side of the skin sheet. Is what you do.

Here, for example, after the movable mold is clamped to the fixed mold side, the divided slide core may be moved inward to hold the skin sheet between the slide core and the fixed mold. . On the other hand, in the molding method according to the third aspect, when the mold is clamped or the slide core is moved, the skin sheet is prevented from being sandwiched between the slide cores. Accordingly, it is possible to suppress the occurrence of pinching wrinkles in the skin layer of the resin molded product.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the slide core is formed in a divided manner, and a pinch suppressing means is provided to suppress pinching of the skin sheet between the respective slide cores. In this case, a slide core is used.

For this reason, particularly when the slide core is moved inward, the skin sheet is prevented from being caught between the slide cores, and the generation of wrinkles by the skin layer of the resin molded product is suppressed. be able to.

According to the fifth aspect of the present invention, the skin sheet is set between the fixed mold and the movable mold of the mold apparatus, and the movable mold is provided with an elastic body at least in the burr-cut portion with respect to the fixed mold. After placing the skin sheet in the cavity formed between the dies, the resin material is injected into the cavity, and the base material is integrally molded on the back side of the skin sheet. It is assumed that.

For this reason, even when the skin sheet is strongly pressed against the fixed mold by the burr cut portion having an edge having a substantially right-angled cross section, the pressing force concentrated on the corner is reduced by the elastic action of the elastic body. You. Accordingly, it is possible to suppress a line-shaped mark due to the corner of the burr-cut portion, that is, a so-called burr-cut line from remaining on the outer surface of the skin layer in the molded resin article.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the elastic body is arranged at the burr cut portion of the movable die so as to protrude by a predetermined amount from the molding surface of the movable die. It is characterized by having been done.

For this reason, even when the elastic body is compressed and deformed at the time of mold clamping, the pressing force of the burr-cutting portion against the skin sheet can be suppressed from decreasing beyond a predetermined value, and a certain burr-cutting effect is secured. be able to.

According to a seventh aspect of the present invention, in the fifth aspect of the present invention, the elastic body is formed of an elastic sheet disposed along a molding surface of the movable mold at the time of molding the base material. It is assumed that.

For this reason, even when the elastic sheet is reduced in elasticity due to repeated use, that is, set, it is only necessary to replace one elastic sheet, and the replacement operation can be easily performed.

In the invention according to claim 8, in the invention according to any one of claims 1 to 7, the resin material is injected into the cavity after the resin material is injected into the resin reservoir. It is characterized by the following.

For this reason, the pressure at the time of injecting the resin material into the cavity can be reduced, and the speed at which the skin sheet is pushed into the cavity during the injection of the resin material can be reduced. For this reason, the rising speed of the tensile force acting on the skin sheet can be reduced. Further, unlike the case where the resin material is injected into the cavity, it is not necessary to provide a highly rigid barrier layer on the skin sheet, so that the skin sheet can be further easily extended.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

First, a mold apparatus used in the method for molding a resin molded product of this embodiment will be described. As shown in FIG. 1, the mold apparatus 21 includes a fixed mold 22 and a movable mold 23 which is opposed to the fixed mold 22 so as to be able to clamp and open the mold. A protrusion 24 is provided on a side surface of the fixed mold 22, and a gate 25 is formed at the center thereof. A slide core 26 is movably fitted into and supported by the protrusion 24 of the fixed mold 22 through a central through-hole 27, and a molding surface 28 is formed on an end surface of the slide core 26.

As shown in FIG. 1 to FIG.
A plurality of set pins 2 are provided on the side surface of the
9 is provided so as to be swingable via a spring 30. Then, by inserting a plurality of set holes 32 formed in the skin sheet 31 into these set pins 29, the skin sheet 31 is set between the fixed mold 22 and the movable mold 23 in a loose clamp state. It has become.

The skin sheet 31 is made of a brushed fabric, a polyvinyl chloride (PVC), a skin material 33 made of natural leather such as cowhide, and a backing material having elasticity which is joined to the back surface of the skin material 33. 34. In this embodiment, slab urethane is used as the backing material 34 in particular.
This slab urethane has higher elasticity and elasticity than foamed polypropylene generally used as a backing material, and the elasticity and elasticity of the skin sheet 31 itself are enhanced.

As shown in FIG. 1, a molding surface 35 is formed on the inner surface of the movable die 23 so as to correspond to the molding surface 28 of the slide core 26 on the fixed die 22 side. And
As shown in FIGS. 7 to 9, when the movable mold 23 is clamped and moved to the fixed mold 22 side, the gap between the molding surface 35 of the movable mold 23 and the molding surface 28 of the slide core 26 on the fixed mold 22 side. A cavity 36 is formed in the cavity. The skin sheet 31 is arranged in the cavity 36.

As shown in FIGS. 1 and 4 to 6, on the side surface of the movable die 23, a deburring slide core 37 formed into four parts is provided with an inner working position and an outer non-working position. Burrs 38 are provided on the inner peripheral edge thereof. Both ends of each slide core 37 are provided with abutting portions 39 which are formed of a step-shaped non-flat surface and constitute a pinching suppressing means. On the side surface of each of the slide cores 37, a temporary holding core 40, which is a four-part pinching suppressing means, is provided so as to be movable between an inner working position and an outer non-working position. I have.

Then, as shown in FIGS. 6 to 8, after the movable die 23 is moved toward the fixed die 22, the temporary holding core 40 is first moved to the inner working position. Thereby, the skin sheet 31 is fixed to the slide core 26 on the fixed mold 22 side.
Is temporarily pressed down by being pressed against the concave portion 41 formed on the outer periphery of the. Next, the slide core 37 for burring is moved to the inner working position, and the skin sheet 31 is sandwiched between the fixed mold 22 and the slide core 37 for burring. At this time, the non-flat surface shape of the butting portion 39 and the temporary holding using the temporary holding core 40 prevent the skin sheet 31 from being sandwiched between the butting portions 39.

As shown in FIGS. 1, 2 and 6, an elastic body 42 is fixedly disposed at the burr cut portion 38 of each slide core 37 so as to project a predetermined amount from the surface of the mold of the slide core 37. ing. The amount of protrusion of the elastic body 42 is set to 0.
The range is preferably from 01 to 1 mm, more preferably from 0.1 to 0.5 mm.

The elastic body 42 is made of an elastic material such as rubber or thermoplastic elastomer, for example.
The surface is subjected to a slidability improvement treatment such as fluororesin processing. Also, when the resin material such as reinforced polypropylene plasticized into the cavity 36 is injected into the cavity 36, the corner 42 a of the end edge of the elastic body 42 on the fixed mold 22 side leaks out of the cavity 36 to form burrs. In order to prevent such a phenomenon, the cross section is formed in a substantially right-angled shape, that is, a so-called pin angle shape. Then, as shown in FIG. 10, the pressing force against the skin sheet 31 is reduced by the elastic action of the elastic body 42 in a state where the skin sheet 31 is pressed against the fixed mold 22 at the burr cut portion 38 of the slide core 37. It is supposed to be.

Next, the mold apparatus 2 configured as described above
The manufacturing method in the case of manufacturing the console lid 43 as a resin molded product having the skin layer 44 by using No. 1 will be described.

Now, in the state shown in FIG.
The movable mold 23 is disposed at a mold opening position separated from the fixed mold 22. Also, the slide core 26 on the fixed mold 22 side
Is disposed at a position floating from the fixed mold 22 and the through hole 27
A pot 27a is formed at the tip of the container 27 as a resin reservoir of a predetermined capacity which communicates with the gate 25. In this state, first, the plurality of set holes 3 formed in the skin sheet 31 are set.
2 is inserted into the set pin 29 on the slide core 26 on the fixed die 22 side. Thus, the skin sheet 31 is set in a loose clamp state between the fixed mold 22 and the movable mold 23, that is, in a state in which the movement is allowed when an elongation load exceeding a predetermined value is applied.

Next, as shown in FIG. 7, the movable die 23 is moved to the fixed die 22 side together with the deburring slide core 37 and the temporary holding core 40. Along with this mold clamping movement, the skin sheet 31 is pushed and stretched by the molding surface of the slide core 26 on the fixed mold 22 side, and is formed between the molding surface 35 of the movable mold 23 and the molding surface 28 of the slide core 26. Is disposed in the cavity 36 to be formed. At this time, a tensile force acts on the skin sheet 31 toward the center thereof.

Here, the backing material 3 of the skin sheet 31
Since 4 is formed of slab urethane, the skin sheet 31 itself is easily extended, and a part of the tensile force is reduced by the extension. In addition, the skin sheet 31 is the mold 2
It is set in a loose clamp state by a set pin 29 between 2 and 23. For this reason, even if the pulling force exceeds a predetermined value, the spring 30 of the set pin 29 bends and the skin sheet 31 is allowed to move toward the center in the loose clamp portion. Thereby, most of the pulling force is reduced, and the skin sheet 3
1 is suppressed.

Thereafter, as shown in FIG. 8, the temporary holding core 40 divided into four parts is moved from the outer inoperative position to the inner operating position. Thus, the skin sheet 31 is pressed against the concave portion 41 on the slide core 26 on the fixed die 22 side and is temporarily pressed. Subsequently, as shown in FIG.
The slide core 37 for deburring divided into four parts is moved from the outside inoperative position to the inner working position. As a result, the skin sheet 31 is pressed against the slide core 26 of the fixed mold 22 at the burr cut portion 38 of the slide core 37.

Here, the butted portion 39 of the dividedly formed burring slide core 37 is formed in a step-shaped non-flat surface. Further, the skin sheet 31 is temporarily held by the core 40.
As a result, the skin sheet 31 is not unintentionally loosened or seen. For these,
The skin sheet 31 is abutting portions 39 of the respective slide cores 37.
It is restrained from being sandwiched between.

In a case where the clearance between the slide core 37 for burr cutting and the slide core 26 on the fixed die 22 side is reduced to perform the mold clamping, the gap between the opposing surfaces of the slide cores 37 and 26 is required. The skin sheet 31 may be dragged, and the skin sheet 31 may be wrinkled or torn. On the other hand, in the molding method of the present embodiment, after the mold is clamped, the temporary holding core 40 is moved prior to the movement of the deburring slide core 37 to the operating position.
Thereby, the skin sheet 31 is temporarily pressed. Therefore, as described above, the skin sheet 31 is not dragged between the facing surfaces of the slide cores 37 and 26, and the occurrence of wrinkles and tears is suppressed.

Subsequently, as shown in FIG. 9, a plasticized resin material is injected into the pot 27a from the gate 25 of the fixed mold 22. Thereafter, as shown in FIG.
Is further moved to the fixed die 22 side together with the deburring slide core 37 and the temporary holding core 40, the slide core 26 on the fixed die 22 side is moved to a position joined to the fixed die 22.

With this movement, the resin material stored in the pot 27a is injected and filled into the cavity 36. As a result, the skin sheet 31 is further stretched with the injected resin material and pressed against the molding surface 35 of the movable mold 23 to form a skin layer 44 having a shape along the molding surface 35. Further, on the back side of the skin layer 44, a base material 45 is provided.
Are integrally joined and molded, and the console lid 43 is manufactured. As described above, the console lid 43 is formed by so-called stamping molding, which can be molded at a lower pressure than injection molding.

Further, since the elastic body 42 is fixedly arranged on the burr cut portion 38 of the burr cutting slide core 37, the skin sheet 31 is fixed to the fixed mold 22 at the corner 42 a of the elastic body 42.
Even when the elastic member 42 is strongly pressed against the side slide core 26, the pressing force concentrated on the corner 42a of the elastic member 42 is reduced by the elastic action of the elastic member 42. For this reason, formation of a linear mark, that is, a so-called burr cut line, on the outer surface of the skin layer 44 of the console lid 43 is suppressed.

Finally, as shown in FIG.
When the mold is opened with respect to the fixed mold 22, the slide core 26 on the fixed mold 22 side is moved and arranged at a position floating from the fixed mold 22. Then, the console lid 43 is taken out from the slide core 26 on the fixed mold 22 side by a projecting operation of a knock pin (not shown) provided on the fixed mold 22 side.

The effects that can be expected from this embodiment will be described below. (A) In the molding method of this embodiment, the skin sheet 31 is set in a loose clamp state between the fixed mold 22 and the movable mold 23 of the mold apparatus 21.

For this reason, when the movable mold 23 is clamped to the fixed mold 22 and when the resin material is injected into the cavity 36, a tensile force exceeding a predetermined value acts on the skin sheet 31 toward the center. Then, movement of the skin sheet 31 toward the center in the loose clamp portion is permitted. Therefore, even if the skin sheet 31 is set between the molds 22 and 23 of the mold apparatus 21 without shaping, the console lid 43 can be formed without the skin sheet 31 being torn. . Therefore, the manufacturing process of the console lid 43 can be simplified and the manufacturing cost can be reduced, and the skin layer 44 having an excellent appearance can be achieved.
Can be manufactured at low cost.

(B) In the molding method of this embodiment, the set holes 32 of the skin sheet 31 are inserted into the plurality of set pins 29 which are swingably disposed on the fixed mold 22 via the springs 30. Thereby, the skin sheet 31 is set in a loose clamp state.

For this reason, when a tensile force exceeding a predetermined value acts on the skin sheet 31, the spring 30 bends and the set hole 32 of the skin sheet 31 is allowed to move, so that the tensile force is reduced. Thus, the loose clamp portion of the skin sheet 31 can be realized with a simple configuration.

(C) In the molding method of this embodiment, a slab urethane is used as the backing material 34 of the skin material 33 in the skin sheet 31. For this reason, when a mold is applied to the skin sheet 31 and a tensile force is applied to the center when the resin material is injected,
The skin sheet 31 itself can be expected to greatly expand. Then, the tensile force is reduced by the extension of the skin sheet 31 itself. Therefore, the occurrence of tears in the skin sheet 31 can be further suppressed.

(D) In the molding method of this embodiment, after the skin sheet 31 is temporarily pressed by the temporary pressing core 40 on the slide core 26 on the fixed mold 22 side, the divided flash cores 37 are formed inside. And pressed down by the slide core 37 for burr cutting.

For this reason, careless loosening of the skin sheet 31 is suppressed, and the skin sheet 31 can be suppressed from being pinched by the butting portions 39 of the adjacent burring slide cores 37. Therefore, it is possible to suppress the occurrence of wrinkles between the console lid 43 and the skin layer 44.

(E) In the molding method of this embodiment, the divided and formed burring slide cores 37 are butted at the butting portions 39 each having a step-like non-flat surface.

For this reason, a simple structure in which the butting portion 39 of the burr cutting slide core 37 is formed as a step-shaped non-flat surface has an effect of sandwiching the skin sheet 31 between the butting portions 39. Can be suppressed.

(F) In the molding method of this embodiment, the skin sheet 31 is pressed against the slide core 26 on the fixed die 22 side by the slide core 37 for deburring via the elastic body 42 at the time of mold clamping. It has become.

Therefore, the pressing force concentrated on the so-called pin corners 42 a of the elastic body 42 is reduced by the elastic action of the elastic body 42. Thereby, while suppressing the generation of burrs at the time of injecting the resin material into the cavity 36,
The formation of a burr cut line on the outer surface of the skin layer 44 of the console lid 43 can be suppressed. In the case where polyvinyl chloride or natural leather is used as the skin material 33 of the skin sheet 31, the formation of the burr cut line is conspicuous, so that it is particularly suitable as a method for forming the console lid 43 having such a skin material 33. It is.

(G) In the molding method of this embodiment, the elastic body 42 is formed by the burr-cut portion 3 of the burr-cut slide core 37.
8 is fixedly arranged so as to protrude from the surface by a predetermined amount.

For this reason, even if the elastic body 42 is compressed and deformed at the time of the mold clamping, the pressing force of the burr cut portion 38 against the skin sheet 31 can be prevented from decreasing beyond a predetermined value, and a certain level can be suppressed. A deburring effect can be ensured.

(H) In the molding method of this embodiment, after the resin material is once stored in the pot 27a,
The slide core 26 on the side is moved from the floating state to the fixed mold 22 to a position where the slide core 26 is joined, so that the slide core 26 is injected into the cavity 36. That is, in the molding method of this embodiment, a so-called stamping molding method is employed.

Therefore, the pressure at the time of injecting the resin material into the cavity 36 can be reduced, and the speed at which the skin sheet 31 is pushed into the cavity 36 during the injection of the resin material can be reduced. . Therefore, the rising speed of the tensile force acting on the skin sheet 31 can be reduced. Further, unlike the case where the resin material is injected into the cavity 36, there is no need to provide the skin sheet 31 with a highly rigid barrier layer.
Can be further extended. Therefore, generation of tears and formation of burrs in the skin sheet 31 can be more effectively suppressed.

(I) In the molding method of this embodiment, the surface of the elastic body 42 is subjected to a slidability improving treatment with a fluororesin. Therefore, at the time of mold clamping, the skin sheet 31 can be effectively prevented from being smoothly slid along the surface of the elastic body 42, and the skin sheet 31 from being torn.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
This embodiment will be described focusing on the differences from the first embodiment.

In the second embodiment, as shown in FIG. 12, a plurality of set pins 29 are
It is disposed on the side slide core 26 via a damper device 47 so as to be swingable. And these set pins 2
By inserting a plurality of set holes 32 on the skin sheet 31 into the skin sheet 9, the skin sheet 31 is set in a loose clamp state.

Therefore, according to the second embodiment, the following effects can be obtained in addition to the effects (a) and (c) to (li) of the first embodiment. it can. (D) In the molding method of this embodiment, the set holes 32 of the skin sheet 31 are inserted into the plurality of set pins 29 that are swingably disposed on the fixed mold 22 via the damper device 47, The skin sheet 31 is set in a loose clamp state.

For this reason, when a pulling force exceeding a predetermined value acts on the skin sheet 31, the set pin 29 is swung via the damper device 47, and the loose clamp portion of the skin sheet 31 is allowed to move. Therefore, the set pin 29
Can be effectively suppressed from being torn in the set holes 32 of the skin sheet 31 into which is inserted.

(Third Embodiment) Next, a third embodiment of the present invention will be described.
This embodiment will be described focusing on the differences from the first embodiment.

In the third embodiment, as shown in FIG. 13, a plurality of pressing members 48 are moved toward the movable die 23 via a spring 49 on the slide core 26 on the fixed die 22 side. Supported in a fired state. Then, when the movable mold 23 is clamped to the fixed mold 22, the skin sheet 31 is pressed against the movable mold 23 by these pressing members 48 and is set in a loose clamp state.

Therefore, according to the third embodiment, in addition to the effects (a) and (c) to (li) of the first embodiment, the following effects can be obtained. it can. (R) In the molding method of this embodiment, the plurality of pressing members 48 resiliently supported by the fixed mold 22 via the spring 49.
By pressing the skin sheet 31 against the movable mold 23, the skin sheet 31 is set in a loose clamp state.

Therefore, when a tensile force exceeding a predetermined value acts on the skin sheet 31, the skin sheet 31 slides between the movable mold 23 and the pressing body 48, and the skin sheet 3
The movement in the loose clamp portion 1 is allowed. Therefore, it is possible to effectively suppress the occurrence of a tear in the clamp portion of the skin sheet 31.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described.
This embodiment will be described focusing on the differences from the first embodiment.

In the fourth embodiment, as shown in FIG. 14, the butting portion 39 of the slide core 37 for burr cutting is replaced with the step-shaped non-flat surface shape of the first embodiment. Therefore, it is formed so as to have an arc-shaped non-flat surface shape. When the slide core 37 is moved from the outside inoperative position to the inner working position, the skin sheet 31 is suppressed from being pinched between the butting portions 39 by the shape and configuration of the butting portions 39. It has become so.

Therefore, according to the fourth embodiment, (a) to (d) and (f) to (f) in the first embodiment are used.
The following effects can be obtained in addition to the effects described in (i).

(ヲ) In the molding method according to the present embodiment, the slide core 37 divided and formed by an arcuate non-flat surface is butted by a butting portion 39 which constitutes an anti-jamming means. The skin sheet 31 is prevented from being pinched between the 37.

For this reason, the skin sheet 31 between the slide cores 37 can be formed by a simple configuration in which the butted portions 39 of the slide cores 37 are formed in an arc-shaped non-flat surface.
Can be effectively suppressed.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described.
This embodiment will be described focusing on the differences from the first embodiment.

In the fifth embodiment, as shown in FIG. 15, the anti-jamming means is formed corresponding to each butting portion 39 of the slide core 37 for burr cutting divided into four parts. A plurality of air nozzles 50 are provided. Then, after the movable mold 23 is clamped to the fixed mold 22, when the slide core 37 is moved from the outside inoperative position to the inner working position, each protrusion of the slide core 37 from these air nozzles 50. Air is blown onto the skin sheet 31 via the joining portion 39. This suppresses the skin sheet 31 from being sandwiched between the butting portions 39.

Therefore, according to the fifth embodiment, (a) to (d) and (f) to (f) in the first embodiment are used.
The following effects can be obtained in addition to the effects described in (i).

(W) In the molding method of this embodiment, air is blown from the butted portion 39 of the divided slide core 37 toward the skin sheet 31,
The skin sheet 31 is prevented from being pinched between the slide cores 37.

For this reason, with a simple structure in which air is blown from the abutting portion 39 of the slide core 37 to the skin sheet 31, it is possible to effectively suppress the skin sheet 31 from being sandwiched between the slide cores 37. .

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described.
This embodiment will be described focusing on the differences from the first embodiment.

In the sixth embodiment, as shown in FIG. 16, a plurality of air passages 51 constituting the pinching suppressing means are formed at predetermined intervals in each of the divided burring slide cores 37 as shown in FIG. Have been. Then, after the movable mold 23 is clamped to the fixed mold 22, before the slide core 37 is moved from the outer inoperative position to the inner operating position, the skin sheet 31 is removed from these air passages 51. Is blown in a knife shape. Thereby, the skin sheet 31 is pressed against the concave portion 41 on the slide core 26 on the fixed die 22 side, and a temporary holding state is realized. And slide core 3
When the 7 is moved to the inner working position, the skin sheet 31 is suppressed from being sandwiched between the butting portions 39.

Therefore, according to the sixth embodiment, (a)-(c) and (e)-
The following effects can be obtained in addition to the effects described in (i).

(F) In the molding method of this embodiment, when the movable mold 23 is clamped to the fixed mold 22 side, air is blown from the vicinity of the slide core 37 toward the skin sheet 31 to thereby form the skin sheet 31. A temporary holding state is realized.

[0092] For this reason, with a simple configuration in which air is blown from the vicinity of the slide core 37 to the skin sheet 31, it is possible to suppress the careless loosening of the skin sheet 31 from occurring. It is possible to suppress the skin sheet 31 from being sandwiched by the butting portions 39 of the adjacent burring slide cores 37. Therefore, it is possible to suppress the occurrence of wrinkles between the console lid 43 and the skin layer 44.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described.
This embodiment will be described focusing on the differences from the first embodiment.

In the seventh embodiment, as shown in FIG. 17, an elastic sheet 5 as an elastic body made of an elastic material such as rubber or elastomer is provided on the side surface of the movable mold 23.
2 is stretched. The fixed mold 22 of the elastic sheet 52
The surface on the side is subjected to, for example, fluororesin processing in order to improve slidability. Then, when the movable mold 23 is clamped to the fixed mold 22 and the resin material is injected and filled into the cavity 36 between the molding surfaces 28 and 35,
The elastic sheet 52 is arranged along the forming surface 35 of the movable die 23 and the burr cut portion 38 of the burr cutting slide core 37.

Therefore, according to the seventh embodiment, in addition to the effects (a) to (e), (h) and (li) of the first embodiment, the following effects are obtained. Can be obtained.

(G) In the molding method of this embodiment, at the time of mold clamping, the skin sheet 31 is not pressed against the slide core 26 on the fixed mold 22 side by the slide core 37 for burr cutting via the elastic sheet 52. ing.

[0097] Therefore, the pressing force concentrated on the pin square edge of the burr cut portion 38 of the slide core 37 is reduced by the elastic action of the elastic sheet 52. This allows
The skin layer 44 of the console lid 43 is formed while suppressing the generation of burrs when the resin material is injected into the cavity 36.
The formation of burr cutting lines on the outer surface of the substrate can be suppressed.

Further, even when the elastic sheet 52 suffers from a decrease in elasticity due to repeated use, that is, a set, only one elastic sheet 52 needs to be replaced, and the replacement operation can be easily performed.

(Eighth Embodiment) Next, an eighth embodiment of the present invention will be described.
This embodiment will be described focusing on the differences from the first embodiment.

In the eighth embodiment, as shown in FIG. 18, the movable mold 23 is not provided with the slide core 37 for burr cutting, and the burr cutting portion 38 is directly provided on the movable mold 23. Have been. An elastic body 42 similar to that of the first embodiment is fixedly disposed on the burr cut portion 38 of the movable mold 23 so as to protrude from the mold surface of the movable mold 23 by a predetermined amount.

Therefore, according to the eighth embodiment, (a) to (c) and (g) to (d) in the first embodiment are used.
The following effects can be obtained in addition to the effects described in (i).

(T) In the molding method according to this embodiment, the mold apparatus 21 is composed of the fixed mold 22 and the movable mold 23 having no slide core 37, and the burr cutting portion 3 of the movable mold 23 is provided.
The elastic body 42 is directly fixedly arranged at 8.

Therefore, the slide core 37 is attached to the movable mold 23.
In the mold apparatus 21 having no burr, the formation of a so-called burr cut line on the outer surface of the skin layer 44 of the console lid 43 due to the pressing of the burr cut portion 38 can be suppressed.

(Modification) This embodiment can be modified and embodied as follows. In the above embodiments, the base material 45 of the console lid 43 is formed by a so-called stamping molding method.
May be formed.

In each of the above embodiments, the mold device 21 has a horizontal structure in which the mold is clamped and opened in the horizontal direction. However, the mold device 21 has a vertical shape in which the mold is clamped and opened in the vertical direction. A mold configuration may be used.

In the above embodiments, the console lid 43 is embodied as a resin molded product. However, other resin products, such as a door trim, an armrest, a glove box, etc., having a skin layer, may be used. ,
It may be embodied in any thing.

In the first to sixth and eighth embodiments, the elastic body 42 is formed of rubber or a thermoplastic elastomer. However, the elastic body 42 is softer (has elasticity) than the metal material of the slide core 37. Alternatively, it may be formed of a resin material having a low friction coefficient, for example, a material such as polyacetal.

Further, technical ideas other than the claims grasped by the above embodiment will be described below together with their effects. (1) The sandwiched skin core is prevented from being sandwiched between the slide cores by abutting the divided slide cores on a non-flat surface. A method for molding a resin molded article having a skin layer.

According to this configuration, it is possible to effectively suppress the skin sheet from being sandwiched between the slide cores by a simple configuration in which the slide cores are butted on a non-flat surface.

(2) The slide core is provided with temporary holding means for aligning the skin sheet along the molding surface on the fixed mold side, and before the movable mold is clamped on the fixed mold side, the temporary holding means provides the skin with the temporary holding means. By temporarily holding the sheet to the fixed mold side,
The method for molding a resin molded article having a skin layer according to claim 4, wherein sandwiching of the skin sheet between the slide cores is suppressed.

According to this configuration, by temporarily pressing the skin sheet by the temporary holding means, the skin sheet can be made to follow the molding surface on the fixed mold side without inadvertent loosening. Therefore, when the slide cores are butted after the temporary holding operation, the skin sheet can be effectively prevented from being sandwiched between the slide cores.

(3) The skin layer according to any one of claims 5 to 7, wherein the elastic body has a surface subjected to a slidability improving treatment. A method for molding a resin molded article having the same.

According to this configuration, when the movable mold is clamped,
The skin sheet slides smoothly along the surface of the elastic body,
The occurrence of tears in the skin sheet can be effectively suppressed.

[0114]

The present invention is configured as described above, and has the following effects. According to the first aspect of the present invention, it is possible to suppress the occurrence of tears in the skin sheet, and to mold a resin molded article having a skin layer having an excellent appearance.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the skin sheet itself tends to elongate, and the occurrence of tears in the skin sheet can be suppressed more reliably.

According to the third and fourth aspects of the present invention, it is possible to suppress the occurrence of pinching wrinkles in a skin layer of a resin molded product, and to provide a resin having a skin layer having an excellent appearance. A molded article can be formed.

According to the fifth aspect of the present invention, a resin molded article having a skin layer having an excellent appearance can be prevented from remaining and exposing burrs on the skin layer of the resin molded article. Can be molded.

According to the invention of claim 6, according to claim 5,
In addition to the effects of the invention described in (1), even if the elastic body is compressed and deformed at the time of mold clamping, a certain deburring effect can be secured.

According to the invention described in claim 7, according to claim 5,
In addition to the effects of the invention described in (1), maintenance of the mold device can be easily performed. In the invention according to claim 8, in addition to the effect of the invention according to any one of claims 1 to 7, it is possible to further suppress the occurrence of tears and the formation of burrs in the skin sheet. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mold apparatus used in a molding method according to a first embodiment.

FIG. 2 is a perspective view showing a skin sheet used in the mold apparatus of FIG. 1;

FIG. 3 is an enlarged partial sectional view showing a loose clamp portion of the skin sheet of FIG. 1;

FIG. 4 is a side view showing the deburring slide core of FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is an enlarged partial cross-sectional view showing the burr cutting slide core of FIG. 1 and its peripheral configuration.

FIG. 7 is a sectional view showing an operation state of a next step of the mold apparatus in FIG. 1;

8 is a sectional view showing an operation state of a next step of the mold apparatus in FIG. 7;

FIG. 9 is a sectional view showing an operation state of a next step of the mold apparatus in FIG. 8;

FIG. 10 is a sectional view showing an operation state of a next step of the mold apparatus in FIG. 9;

FIG. 11 is a sectional view showing an operation state of a next step of the mold apparatus in FIG. 10;

FIG. 12 is an enlarged sectional view showing a main part of a mold apparatus used in the molding method according to the second embodiment.

FIG. 13 is an enlarged sectional view showing a main part of a mold apparatus used in the molding method according to the third embodiment.

FIG. 14 is an enlarged sectional view showing a main part of a mold apparatus used in the molding method according to the fourth embodiment.

FIG. 15 is a plan view showing a main part of a mold apparatus used in a molding method according to a fifth embodiment.

FIG. 16 is an enlarged sectional view showing a main part of a mold apparatus used in a molding method according to a sixth embodiment.

FIG. 17 is a sectional view showing a mold apparatus used in the molding method according to the seventh embodiment.

FIG. 18 is a sectional view showing a mold apparatus used in the molding method according to the eighth embodiment.

FIG. 19 is a cross-sectional view showing a mold apparatus used in the first conventional method.

FIG. 20 is a sectional view showing a mold apparatus used in the second conventional method.

[Explanation of symbols]

21 mold apparatus, 22 fixed mold, 23 movable mold, 27a
... Pots constituting the resin pool portion 29. Set pins 3 for setting the skin sheet in a loose clamp state, 3.
1 ... skin sheet, 33 ... skin material, 34 ... backing material,
Reference numeral 36 denotes a cavity, 37 denotes a slide core for deburring as a slide core, 38 denotes a deburring portion, 39 denotes a butt portion that constitutes a pinching suppressing means, 40 denotes a temporary holding core that constitutes a pinching suppressing means, and 42 denotes an elastic body. Reference numerals 43, console lid, 44, skin layer, 45, base material, 50, air nozzles constituting the sandwiching suppressing means, 51, air passages constituting the sandwiching suppressing means, 52, elastic sheet as an elastic body.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuji Nakayama 1 Ochiai Nagahata, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture Toyoda Gosei Co., Ltd. (72) Inventor Tatsuo Yamada 1 Ochiai-Ogata, Kasuga-cho, Nishikasugai-gun, Aichi F-term (reference) in Toyoda Gosei Co., Ltd. 4F202 AD08 AD20 AG03 AH25 CA11 CB01 CK42 CK52 CQ01 CQ07 4F206 AD08 AD20 AG03 AH25 JA03 JB13 JF05 JM04 JM05 JM13 JN13 JN22 JQ81

Claims (8)

[Claims] 1. A skin sheet is set in a loose clamp state between a fixed mold and a movable mold of a mold apparatus, and the movable mold is clamped to a fixed mold side, so that a cavity formed between the molds is closed. A method for molding a resin molded article having a skin layer, comprising: injecting a resin material into a cavity after disposing a skin sheet on the base material, and integrally molding a base material on the back side of the skin sheet. 2. The method for molding a resin molded article having a skin layer according to claim 1, wherein the skin sheet is formed by bonding a high elastic backing material to the back surface of a skin material. 3. A skin sheet is set between a fixed mold of the mold apparatus and a movable mold having a slide core, and the movable mold is clamped to the fixed mold while suppressing the skin sheet from being pinched. After arranging the skin sheet in the cavity formed between the molds, a resin material is injected into the cavity, and the base material is integrally molded on the back side of the skin sheet. Product molding method. 4. The slide core according to claim 3, wherein said slide core is divided and formed, and said slide core is provided with a sandwiching suppressing means for suppressing the skin sheet from being sandwiched between the respective slide cores. A method for molding a resin molded article having a skin layer as described above. 5. A skin sheet is set between a fixed mold and a movable mold of a mold apparatus, and the movable mold is clamped with respect to the fixed mold with at least a burr-cut portion interposed with an elastic body. After arranging the skin sheet in the cavity formed between the molds, a resin material is injected into the cavity, and the base material is integrally formed on the back side of the skin sheet, thereby forming a resin having a skin layer. Molding method of molded article. 6. The skin layer according to claim 5, wherein the elastic body is disposed at a deburring portion of the movable mold so as to protrude by a predetermined amount from a molding surface of the movable mold. A method for molding a resin molded article having: 7. The resin molded article having a skin layer according to claim 5, wherein said elastic body is formed of an elastic sheet arranged along a molding surface of said movable mold when said base material is molded. Molding method. 8. The resin molding having a skin layer according to claim 1, wherein the resin material is injected into the resin reservoir and then into the cavity. Product molding method.