JPH0596628A - Jig and method for forming skin material - Google Patents

Abstract

PURPOSE:To make press forces relative to a skin material exert even on a ridged part between mutually intersecting side wall surfaces in a product core on the low frictional area, and prevent the occurrence of creases being likely to arise in the prior art by pressing down a sheet-like skin material and an upper mold situated upside thereof on an article core from the side of an upper surface. CONSTITUTION:A jig is to stick a skin material 2 on the outer surface of a box-typed article core and, on the lower mold 3 to be attached with the box- typed article core, a truncated pyramid type blank holder part 6 is provided and in the proximity to the ridges of the blank holder part. a low frictional area 7 is provided, and then a press member 16 is provided on an upper mold, which acts to hold the ridges relative to the skin material 2 located on the low frictional area 7 and press down in the direction of spreading them to both sides.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin material molding jig for molding a sheet-shaped skin material in a shape along the surface of a box-shaped product core such as a console box as an automobile interior part. The present invention relates to a molding method.

[0002]

2. Description of the Related Art Automotive interior parts such as console boxes are made of hard plastic or the like (hereinafter referred to as "box main body") in order to impart a feeling of luxury and softness, as described in Japanese Patent Laid-Open No. 3-112628, for example. It is finished by pasting a surface material such as woven cloth or synthetic leather on the surface of the product core).

In this case, conventionally, a method has been adopted in which a skin material is preformed in conformity with the three-dimensional surface shape of the product core, and the product core is covered with the skin material and adhered with an adhesive. According to this method, the skin material is cut according to each of a plurality of surfaces of the box-shaped product core, and then the preformed body is manufactured through the steps such as stitching. However, in such a preform, various variations are likely to be accumulated to cause a difference with respect to the product core shape.
This causes a problem that the sticking state easily occurs due to slack and wrinkles.

On the other hand, in the case of sticking a skin material from the upper surface to the side wall surface of a box-shaped product core, a product core having an adhesive applied on the surface is mounted on a lower mold, and a peripheral sheet is sandwiched between the product cores. The skin material can be adhered by a pressing operation in which the skin material is positioned parallel to the upper surface of the product core and is pressed down from the upper surface side of the product core. In this operation, first, the central portion of the skin material is attached to the upper surface of the product core, and then the skin material is further lowered, and an upper mold having a product core pressing body that covers the outer surface of the product core is pressed from above. By descending, the outer side of the central portion of the skin material is molded and attached along the vertical side wall surface of the product core on the inner peripheral surface of the product core pressing body.

[0005]

However, when the skin material is adhered to the outer peripheral surface of the box-shaped product core by the molding method by the above-mentioned pressing operation, the ridge line between the side wall surfaces which are orthogonal to each other in the product core. A slack is more likely to occur in the portion toward the lower side away from the upper surface, thus causing a problem that wrinkles are likely to occur in this portion.

[0006]

In order to solve the above-mentioned problems, a skin material forming jig according to claim 1 of the present invention comprises a lower mold having a box-shaped product core mounting portion on the upper side, An upper mold having a product core pressing body having a space into which the product core is fitted from below is provided, and a sheet-like skin material having a peripheral edge sandwiched and arranged substantially parallel to the upper surface of the product core and the same. A skin material molding jig for molding a skin material into a shape along the side wall surface from the top surface of the product core by pushing down the upper mold from the top surface side of the product core. Also provided on the lower side is a truncated pyramid-shaped blank holder that slopes downward toward the outside, and a low-friction region is provided near the ridgeline of the blank holder section that is continuous with the ridgeline between adjacent sidewall surfaces of the product core. And press the above A pressing member for pressing in the direction to widen on both sides of the ridge against skin material located low friction region is characterized by being provided in the upper die during lowering.

According to a second aspect of the present invention, there is provided a method for forming a skin material according to the first aspect, wherein an adhesive is applied to at least one of the product core and the sheet-like skin material. While attaching the product core to the mounting part of the lower mold, while preheating the skin material and performing vacuuming through the vacuum suction holes formed in the lower mold when pushing down the skin material,
The feature is that a skin material is attached along the upper surface and the side wall surface of the product core.

[0008]

In the skin material forming jig according to the first aspect, the skin material located on the low friction region of the lower die is spread by the pressing member on both sides of the ridge line of the low friction region. .. This forming force also acts on the skin material at the ridge portion between the side wall surfaces of the product core which are continuous with the ridge line of the low friction region and are orthogonal to each other, and therefore, the occurrence of slack, which has been apt to occur conventionally, is suppressed in this portion. ..

Therefore, as in the molding method according to the second aspect, an adhesive is applied to at least one of the product core and the skin material, and the extensibility of the skin material is increased by preheating, and also through the vacuum suction holes. While evacuating,
By performing the operation of applying the skin material from the upper surface of the product core to the side wall surface by using the vacuum forming jig according to claim 1, the ridge line portion between the adjacent vertical side wall surfaces in the product core is formed. A wrinkle-free sticking state can be achieved without causing slack.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS.

As shown in FIG. 2, the skin material molding jig of this embodiment comprises a lower mold 3 and an upper mold 4 for vertically sandwiching and pressing the product core 1 and the skin material 2 above the product core 1. There is. In the case of the figure, the product core 1 is used as a console box body to be installed in a passenger car, and has a box-like shape of a substantially rectangular parallelepiped whose lower surface is open. While being covered with the portion 1a, the opening 1b is formed on the right side of the upper surface portion 1a by cutting out to the right end thereof. In the opening 1b at the central portion in the left-right direction, an intermediate horizontal plate portion 1c is formed at a position lower than the upper surface portion 1a over the front and rear side wall surfaces.

The upper side of the lower mold 3 is the product core 1
It is formed as a core mounting portion (mounting portion) 5 having a shape along the inner space of, and has a substantially U-shaped cross-section with a central portion cut out from above. When the product core 1 is mounted on the core mounting portion 5 from above, the upper surface of the left upper protruding portion 5a of the core mounting portion 5 is below the upper surface portion 1a of the product core 1 and the central cutout portion 5b. The upper surfaces are in contact with the lower sides of the intermediate horizontal plate section 1c, respectively, and the right upper projection section 5c flush with the upper surface of the left upper projection section 5a is formed by the intermediate horizontal plate section 1c.
The product core 1 is fixed to the core mounting portion 5 in a state of penetrating upward through the opening on the right side of c.

The lower side of the core mounting portion 5 is formed as a quadrangular pyramid-shaped blank holder portion 6. The blank holder portion 6 has an inclined surface on the upper surface, which is inclined downward toward the outside through a curved surface portion having a gentle curvature which is continuous with the outer periphery of the lower edge of the core mounting portion 5. Then, in the blank holder part 6, the middle areas of the inclined ridges at the front, rear, left and right, four places are finished so that the surface roughness is, for example, about 0.8 s so as to have a lower friction surface than other areas, or fluororesin. They are formed as coated pressure receiving surfaces (low friction areas) 7 ... A large number of small holes (vacuum suction holes) 8 communicating with the lower surface of the lower mold 3 are opened on the surface of the lower mold 3. This lower mold 3 is fixed on the bed of the press machine via a vacuum manifold member connected to a vacuum pump (not shown), and the small holes 8 ... Are connected to the vacuum pump by operating a switching valve.
A vacuum can be appropriately drawn through the small holes 8.

On the other hand, the upper die 4 is provided with an upper surface plate 11 fixed to an upper ram of a pressing device (not shown). The upper surface plate 11 has a lower surface opened at the lower center thereof and the product. A box-shaped product core pressing body 12 surrounding the upper surface and four side surfaces of the core 1 is a product core pressing body mounting post 1
It is fixed through 3 ... Also, the product core pressing body 1
2, the cylindrical skin material peripheral pressing rollers 14 are horizontally arranged at positions slightly lower than the lower surface of 2 and respectively corresponding to the four sides of the surrounding rectangle. Each of the pressing roller support posts 15 that hangs from the face plate 11 is rotatably supported by a lower end portion thereof about a horizontal axis.

Further, the upper surface plate 11 has a product core pressing body 1
Corner pressing members (pressing members) 16 are respectively arranged at positions on the outer sides of the four corners of the lower mold 3 corresponding to the pressing receiving surfaces 7 of the lower mold 3. Each of the corner pressing members 16 has a shape in which two flat plates made of, for example, a plastic material having appropriate elasticity are brought into close contact with each other and hang downward from the upper surface plate 11, and at each lower end side, relative to each other. The flat plate facing is curved in a skirt-like shape. Further, when the upper die 4 is lowered, the lower end portions of the flat plates of the corner pressing members 16 ... Abut on the inclined surfaces on both sides of the ridge line in the pressing receiving surface 7, respectively.

As described above, the product core 1 according to this embodiment has the intermediate horizontal plate portion 1c at the central portion in a stepped manner with respect to the upper surface portion 1a. There is further provided a rectangular parallelepiped middle die 17 for filling the above space to be substantially flush with the upper surface 1a. On the other hand, the skin material 2 is made of woven cloth or synthetic leather, and the peripheral portion is fixed to a fixed frame 18 assembled in a square frame shape so that the fixed frame 18 is stretched in a planar shape. Is being prepared.

Next, an operation procedure for adhering the skin material 2 to the surface of the product core 1 using the skin material molding jig having the above-described structure will be described.

First, an adhesive is applied to the outer surface of the product core 1, and the product core 1 is set over the core mounting portion 5 of the lower mold 3 fixed on the bed of the press machine. Next, by placing the middle die 17 on the intermediate horizontal plate portion 1c of the product core 1, the upper surface side of the product core 1 is the top portion 1a.
7, the right upper protruding portion 5 in the upper surface / core mounting portion 5
The upper surface of c is substantially flush with the upper surface (hereinafter, the entire upper surface of these three members is referred to as the product core upper surface portion).

On the other hand, the skin material 2 is heated to a predetermined temperature in order to impart stretchability to the skin material, and the skin material 2 is positioned above the product core 1 so that the center thereof is substantially aligned with the fixing frame 18 to keep horizontal. Then, it is lowered together with the upper mold 4, and vacuum is drawn through the small holes 8 of the lower mold 3. In the process of this descending operation, the skin material 2 first uniformly contacts the upper surface of the product core to cover it. After that, when the lowering operation of the fixing frame 18 that fixes the peripheral edge of the skin material 2 is continued, in the skin material 2, a portion outside the central portion covering the upper surface of the product core is outside the peripheral edge of the upper surface of the product core. It is in a state of being inclined downward toward the fixed frame 18. Then, the product frame pressing body 12 of the upper die 4 is descended from the product core upper surface side in a state in which the fixed frame 18 is further lowered and an appropriate tension is applied to the skin material 2.
As a result, the portion of the skin material 2 outside the upper surface of the product core is squeezed by the lower end surface of the product core pressing body 12, and the inner peripheral surface of the product core pressing body 12 and the product core 1 are squeezed.
Gradually enter into the space between the side walls. In this way, the fixing frame 18 is maintained while maintaining an appropriate tension acting state on the skin material 2.
By continuing the descending operation of the upper mold 4, the skin material 2 is formed so as to cover from the upper surface of the product core to the lower end of the vertical side wall surface. At this time, the small hole 8 in the lower mold 3
By performing the vacuuming through the ..., The entire close contact state can be obtained without leaving bubbles between the skin material 2 and the product core 1.

In the above-mentioned skin material molding jig, before the upper die 4 descends and the molding of the skin material 2 by the product core pressing body 12 is completed, each of the corner pressing members 16 ... As shown in FIG. 3, the lower end portion of the lower die 3 comes into contact with the press receiving surfaces 7 ... Therefore, while the upper die 4 is further lowered from the time of this contact, as shown in FIG. 1, the lower ends of the two flat plates of the corner pressing members 16 are located on both sides of the ridge line portion of the pressure receiving surface 7. Therefore, they are deformed in the directions in which they expand and the inclination direction. On the other hand, since the pressure receiving surface 7 is formed as a low friction surface as described above, the skin material 2 is also ridged by the movement of the lower ends of the two flat plates of the corner pressing member 16 as described above. It is stretched in the direction of spread and the direction of inclination to both sides.

In this way, the upper die 4 reaches the bottom dead center and the molding of the skin material 2 is completed while applying the stretching force to the skin material 2 at each ridge portion on the blank holder portion 6.

When the upper die 4 reaches the bottom dead center, the peripheral edge portion of the skin material 2 is also pressed against the blank holder portion 6 of the lower die 3 by the respective peripheral edge material pressing rollers 14 of the upper die 4, In this state, the adhesive applied to the outer peripheral surface of the product core 1 is held until it is cured and the skin material 2 is attached to the product core 1. Next, the raising operation of the upper mold 4 is performed, and
Vacuuming through the small holes 8 is stopped, and the product core 1 is taken out from the lower mold 3. Then, after cutting the non-adhesive region of the skin material 2 to the product core 1, as shown in FIG. 4, the edge portion 2a is folded back to the inner peripheral side of the product core 1 to be fixed by adhesion. The final process is performed, and the operation of attaching the skin material 2 is completed.

As described above, in the above embodiment, the skin material 2
When molding is performed along the side wall surface orthogonal to the product core upper surface portion parallel to this, the blank holder portion 6 applies an additional force in the spreading direction across the ridge line by the corner portion pressing members 16 ...
It acts on the upper skin material 2.

As a result, the above-mentioned force acts on the ridge portion of the side wall surface of the product core 1 to eliminate the slack, and as a result,
It is possible to achieve a wrinkle-free close contact state over the entire outer peripheral surface of the product core 1.

In the above embodiment, the product core 1
An example in which an adhesive is applied to the surface of the skin and the skin material 2 is adhered has been described. However, for example, applying the adhesive to the skin material 2 side, or replacing the adhesive with, for example, a pressure-sensitive type A double-sided adhesive tape or the like may be applied as an adhesive to at least one of the product core 1 and the skin material 2 to produce the same.

[0026]

As described above, the jig for forming a skin material according to claim 1 of the present invention is a truncated pyramid which is inclined downward toward the outside below the mounting portion of the product core in the lower die. A blank holder part having a shape is provided, and a low friction region is provided in the vicinity of the ridge line of the blank holder part connected to the ridge line between adjacent side wall surfaces in the product core, and a skin located on the low friction region at the time of pushing down. The upper die is provided with a pressing member that presses the material in a direction of expanding the material on both sides of the ridgeline.

As a result, a force is exerted on the skin material at the ridge portion between the side wall surfaces of the product core which are orthogonal to each other so as to sandwich the ridge line and spread it to both sides. To be done. Therefore, as in the molding method according to claim 2, an adhesive is applied to at least one of the product core and the skin material, and the extensibility of the skin material is increased by preheating, and a vacuum is drawn through the vacuum suction holes. By performing the operation of applying the skin material from the upper surface to the side wall surface of the product core while using the molding jig according to claim 1, a space between the adjacent vertical side wall surfaces of the product core is increased. There is no slack in the ridge portion, so that there is an effect that a wrinkle-free pasting state can be achieved from the upper surface of the product core to the entire side wall surface.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts at the time of an operation of attaching a skin material to a product core by using a skin material forming jig according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a relationship between the skin material forming jig and the skin material and a product core.

FIG. 3 is a vertical cross-sectional view showing a state immediately before the completion of the sticking operation.

FIG. 4 is a cross-sectional view of the end region on the opening forming side of the product core for explaining the final processing of the edge portion of the skin material at the time of completing the attaching operation.

[Explanation of symbols]

 1 product core 2 skin material 3 lower mold 4 upper mold 5 core mounting part (mounting part) 6 blank holder part 7 pressure receiving surface (low friction area) 8 small hole (vacuum suction hole) 12 product core pressing body 16 corner pressing member (Pressing member)

Claims (2)

[Claims] 1. A lower mold having a box-shaped product core mounting portion on the upper side and an upper mold having a product core pressing body having a space into which the product core is fitted from the lower side are provided, and a peripheral edge is provided. By pressing down the sheet-shaped skin material that is sandwiched and arranged substantially parallel to the top surface of the product core and the upper mold above it from the top surface side of the product core, the skin shape is formed along the side wall surface from the top surface of the product core. A jig for forming a skin material for forming a material, which is provided with a truncated pyramid-shaped blank holder portion that is inclined downward toward the outside, below the mounting portion of the lower die, and in the product core. A low-friction region is provided near the ridgeline of the blank holder part that is continuous with the ridgeline between the adjacent side wall surfaces, and in the direction in which the ridgeline is sandwiched with respect to the skin material that is located on the low-friction region when the blank is pushed down. Press A jig for forming a skin material, wherein the pressing member is provided on the upper mold. 2. An adhesive material is applied to at least one of a product core and a sheet-like skin material, and while the product core is attached to the lower die mounting portion, the skin material is preheated, and when the skin material is pushed down, The skin material forming jig according to claim 1, wherein the skin material is attached along the upper surface and the side wall surface of the product core while performing vacuuming through the vacuum suction holes formed in the mold. Molding method.