JPS6352716A - Die forming method for interior sheet and its device - Google Patents

Abstract

PURPOSE:To improve and uniformize the inversion capability of die forming by giving a pressure to a little inversion parts through a means such as air pressure other than a die closing pressure. CONSTITUTION:A previously formed and hole bored base sheet 7 is put on a male die 3, a skin member 12 in which a skin sheet 9 and a cushion sheet 8 are layered is interposed, and a female die 2 is clamped. Air is expelled from the die 2 and air is supplied to the die 3 to bring the preheated skin member 12 to close contact with the die 2 and the member 12 is also adhered to the base sheet 7 by die closing force. In that time, the inversion capability is improved by pressurizing parts not subjected to a perpendicular pressure at die closing with air pressure from a pipe A in the die 3. In that method, the overall inversion capability is improved and the die forming is made to be uniform.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drawing forming method and an apparatus thereof, and in particular, to an interior material that can form deep drawings when molding an interior material such as a quadruple-layered automobile interior material. The present invention relates to a method for forming a diaphragm and an apparatus therefor.

[Prior art] Conventionally, an interior material as shown in FIG. 4, for example - skin material 43
When forming the door lining D in which the cushioning material 44 and the base material 40 are laminated, as shown in FIG. 4(A),
A base material 40 previously formed into a predetermined shape on a male mold (lower mold) 41
A skin member made by laminating a skin material 43 and a cushion material 44 is clamped between the female mold (upper mold) 42 and the male mold 41, heated and clamped, and the male mold is placed as shown by the arrow. Vacuum forming is performed by removing the air in the female mold. At this time, the reversibility of the mold drawing formed on the mold surface 42a of the female mold 42 to the door lining D, etc., which is a product, cannot be formed well under vacuum pressure, so the male and female mold clamps. Pressure is the main cause of throttling reversal.

Therefore, in the part indicated by X of the mold drawing surface 42a in FIG. In the part shown by drawing surface Y that is not perpendicular to the clamping force of the upper and lower molds, no force perpendicular to the door lining D is applied to the drawing surface of the mold, so that the crest is reversed to the skin material 43. Sex is not good. Specifically, in the door lining D, the armrest portion, a portion of the upper portion, and the rear wall have thinner aperture inversions.

In this way, parts that do not face up to the mold clamping force have poor drawing reversibility, so there is a technique to form the mold drawing of the skin material deeper than specified, assuming that the drawing reversibility is poor. .

[Problem to be solved by the invention] The above-mentioned technique of forming a deep mold drawing in advance is based on the assumption that the pattern on the mold surface in contact with the skin material has a weak reversibility, and it is difficult to form a fine drawing or When forming marks that require a delicate shape, for example, on the skin material, it is difficult to create a deep skin tone due to poor reversibility, and it is difficult to form the diaphragm uniformly over the entire skin material. The problem of difficulty is not solved. Second, forming the die draw of the skin material deeper than a predetermined value on the premise that the reversibility of the draw is poor will cause problems such as product variations.

[Means for Solving the Problems] The technical object of the present invention is to provide a drawing forming method for interior materials such as door linings and side linings, which solves the above-mentioned problems, and an apparatus therefor.

As for the drawing forming method, a skin material having at least a base phase is interposed between the male mold and the female mold, the molds are clamped, and the skin material is used to draw the mold formed on the mold surface of either the upper mold or the lower mold. In the method of reversing the mold, pressure is applied to a portion where the reversal of the mold draw is thin or a portion where the reversibility of the mold draw is poor using a means other than the pressure caused by the mold clamping.

More specifically, as shown in the examples, as a means other than the pressure by mold clamping, the interior material can be pressed from the side of the mold that does not have a drawing surface to the drawing surface using air pressure. be. Furthermore, the interior material is pressed against the die drawing surface by pressing a piece formed on the side of the mold that does not have a drawing surface.

In addition, one of the male and female molds is provided with a drawing surface having a large number of small holes, and the other mold is provided with a closed mold, a pressing die for pressing the drawing surface, and compressed air supply means. , interposing a skin material and a cushioning material between the male and female molds and clamping the molds;
First, compressed air is supplied to reverse the drawing on the skin material. Next, the base material is placed on a press die and the press die is pressed.

In this way, the base material placed on the press mold, the skin material and the cushion material are joined to form a drawstring of the interior material.

Furthermore, as a draw-forming device, in a draw-forming device for interior materials that clamps male and female (upper and lower) molds to form the mold and inverts the mold draw to the skin material, a mold having a large number of small holes formed in one mold is used. The present invention is configured to include a drawing surface and means for applying pressure to at least a part of the drawing surface formed on the other mold that is different from the clamping pressure direction of the upper and lower molds.

More specifically, as shown in the examples, pressure is applied by compressed air from a hollow pipe formed in a mold having no constriction surface. Furthermore, a piece is provided with a pressing means formed on the die surface of a die that does not have a die drawing surface.

[Operation] The operation of the present invention will be explained based on the embodiment shown in FIG.

A base material 7 that has been preformed into a predetermined shape and has air holes formed therein.
is placed on a male mold 3, and a skin member 12 is interposed between the male mold 3 and the female mold 2, which is a laminated skin material 9 made of preheated polyvinyl chloride or the like and a cushion material 8 made of polypropylene foam or the like. After the mold is clamped by sheet clamps 10 on the left and right sides of the mold, the mold is clamped.

Then, from the female mold 2 side, an air exhaust device (not shown) is operated to exhaust the air inside the cavity through the small holes formed in the mold, and from the male mold 3, an air supply device (not shown) is operated to discharge the air from the small holes. Send compressed air. by this,
The preheated skin member 12 is brought into close contact with the female mold surface, and at the same time, the skin member 12 and the base material 7 are joined by the mold clamping force with the male mold 3.

Furthermore, when the male mold 3 is pressurized, compressed air is sent from the opening 4a of the hollow pipe 4 formed in the part where the reversibility of the mold drawing is poor, and air pressure is applied to the part where pressure is not applied perpendicularly to the surface during mold clamping. Improve reversibility of mold drawing. At this time, the pressure applied directly to the drawing surface of the mold is a force that does not affect the skin material and cushioning material, for example, 2 K g / cm'
degree is preferred. Although the air supply device connected to the hollow pipe is formed in communication with the pipe body 6, it can be connected to another device.

Further, by setting the location where pressure is applied, it becomes possible to satisfactorily reverse the deep drawing formed in the mold at a desired location.

In this way, it is possible to improve the reversibility of the mold drawing, and to form a deep skin tone or other desired drawing.

Furthermore, it is possible to invert the mold drawing uniformly or partially with emphasis on the entire surface of interior materials such as door linings and side linings.

[Example] Hereinafter, each embodiment of each invention will be described based on the drawings.

It should be noted that, as a matter of course, the components, other members, and arrangements described or illustrated in the following illustrative examples are not intended to limit the present invention, but are merely illustrative examples.

FIG. 1 shows an embodiment of the method and apparatus of the present invention, FIG. 1(A) is a schematic cross-sectional view of the apparatus of the present invention, and FIG. C) is a sectional view taken along line II in FIG. 1(B).

In the figure, reference numeral 1 is a drawing forming device, and drawing forming device 1
is female type (upper type in this example) 2 and male type (lower type in this example) 3
It is composed of.

The female mold (cavity) 2 is formed in a predetermined shape (in this example, 1 to aligning shape), and has a diaphragm (not shown) formed on the mold surface of the female mold 2, and air from the female mold 2. It consists of a large number of air venting holes (not shown) provided on the mold surface to discharge air, and a tube 11 communicating with the holes. device).

The male mold 3 has a core that engages with the female mold 2, and the mold surface has:
Like the female mold 2, a large number of small holes (not shown) are formed, and the mold surface is not perpendicular to the mold clamping direction when the mold is clamped (the horizontal surface in Fig. 1 (A)). 3a, 3a,
..., in the case of door lining D in this example, it has unevenness, an armrest part that does not face the mold clamping direction, a part of the upper part, a thin part of the rear wall that is inverted or thin, and the mold reversibility is poor. Openings 11 4a of the hollow pipe 4 are formed at the locations 3a, 3a, . The hollow pipe 4 communicates with a cavity 5 formed in the male die 3, and the cavity 5 is connected to a pipe body 6 and to a compressed air supply device (not shown).

FIG. 2 shows another embodiment, FIG. 2(A) is a schematic cross-sectional view of an apparatus used in the method of the present invention, and FIG. 2(B) is a partially enlarged cross-sectional view of the apparatus of FIG. 2(A). It is a diagram.

In the following embodiments, the same materials, members, devices, arrangement, etc. as in the embodiment shown in Figure 1 will be denoted by the same reference numerals, and the explanation thereof will be omitted.

In FIG. 2, a piece 22 is formed on the mold surface 21a of the male mold 21 at a portion where clamping pressure is weak during mold clamping, and the lower end of the portion of the piece 22 that is not the mold surface 22a is formed on an inclined surface 22b. A rod 24 is in contact with the inclined surface 22b, and the rod 24 is connected to a cylinder 23 using hydraulic pressure such as hydraulic pressure or pneumatic pressure. The tip of the rod 24 is formed obliquely so as to align with the inclined surface of the piece. Also, inside the piece 22 is a guide Iζ pin 25 that is engaged with the male die 21.
The guide bin 25 is formed to be movable in parallel. In this example, the pieces are shown by reference numeral 22, and pieces 26.
It forms three of 27.

As for the piece 22, the cylinder 23 of the male mold 21 operates simultaneously with mold clamping to apply pressure Fl. The pressure F1 is such that a pressure F2 is applied to the piece because the tip of the rod 24 forms an inclined surface and the piece 22 is allowed to move in parallel by the guide bin 25. ing.

Furthermore, the pieces 26 and 27 are formed so that they can be moved in parallel with each other by forming a guide bin 28. Note that the reference numeral 29 is a cylinder, and the reference numerals 30a and 30b are rods.

Next, the operation in this example will be explained.

The base material 7, which has been previously formed into a predetermined shape and has two holes, is placed on the core of the male mold, and a preheated P is placed between the male mold and the female mold.
After sandwiching the mold by sheet clamps 10 on the left and right sides of the mold with a skin member 12 in which a skin material made of vC and a cushion material 8 made of PP foam are laminated, the male and female molds are clamped.

The air in the can and tee is discharged from the female mold 2 side, and compressed air is sent from the male mold. As a result, the preheated skin member 12 is brought into close contact with the mold surface, and at the same time, the skin member 12 and the base material 7 are joined by the mold clamping force of the male mold.

Furthermore, when pressurizing the male die, the pressure applied directly to the die drawing surface, which is formed at a place where the reversibility of the die drawing is poor, is a force that does not cause any damage to the skin material or cushioning material, for example, 2 K g /
It is preferable that it is around crn'.

The magnitude of the pressure F2 applied to the piece is made equal to the pressure applied to the flat part, which is another mold surface. By doing this, the aperture reversal can be made uniform.

Since the surface of the skin material 9 is pressed against the die drawing surface while crushing the cushion phase 8, the amount of translation of the piece may be a little.

In addition, the size of the female cavity should be set at a predetermined interval based on the external dimensions of the product such as the door liner, taking into account the thickness of the skin material, the thickness of the base material LI-, the cushioning properties and thickness of the cushioning material, etc. .

FIG. 3 is a schematic cross-sectional view showing an apparatus used in another method.

In the present invention, the skin material and the cushion material are previously molded using a female mold, the mold drawing is reversed, and then the base material is joined.

In the figure, reference numeral 31 is a drawing forming device used in one embodiment of the method of the present invention, and the drawing forming device 31 has a female die (upper die in this example) 32 and a male die (lower die in this example) 33. It consists of

The female mold (cavity) 32 is formed into a predetermined shape (in this example, a door lining D), and has a diaphragm (not shown) formed on the mold surface of the female mold 32, and air from the female mold 32. Numerous small holes (
(not shown) and a tube body 32a communicating with the small hole,
The tube body 32a is connected to an air exhaust device (vacuum device) not shown.

The male mold 33 includes a closed mold 33a for compressed air and an internuclear type 33.
In addition to the mold 33b, a mold 33b is formed. Holes 33c, 33c for feeding compressed air are formed in predetermined portions of the closed mold 33a of the male mold 33, and the chain hole 33c is connected to a compressed air supply device (not shown). Further, the closed die 33a is provided with a push die 33b, and the push die 33b is movable by a cylinder 34 and a rod 35. The mold surface of the pressing die 33b is formed to align with the female die 32.

Next, the effect of the method of this example will be explained.

According to the method of this example, a skin member 36 made of a preheated skin material 36a and a cushion material 36b is interposed between the male and female molds, and the molds are clamped. Next, a compressed air supply device (not shown) is operated to supply compressed air from the hole 33c, and an air exhaust device (not shown) is operated to
Air is removed from the female mold 32 side through a. In this way, the die drawing is reversed on the surface of the skin material 36a. At this time, the pressure applied directly to the drawing surface of the mold is a force that does not cause any damage to the skin material and cushion material, and is preferably about 2 K g/cm', for example.

After performing pressure forming and inverting the die draw to the skin material 36a in this manner, the base material 37 is placed on the press die 33b. Base material 37
An adhesive or the like is applied to the joint surface with the skin member 36. Then, the press die 33b is pressed to join the base material 37 placed on the press die 33b and the skin member 36.

With this configuration, it is possible to easily manufacture the mold without forming a large number of air holes in the male mold, and to provide a method with good reversibility of mold drawing.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

It improves the reversibility of mold drawing, and can form a deep skin tone and other desired drawings.

You can also flip it.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the method of the present invention, and FIG.
) is a schematic cross-sectional view of the apparatus used in the method of the present invention, FIG. 1(B) is a door lining as an interior material, and FIG.
C) is a sectional view taken along the line II in FIG. 1(B), FIG. 2 shows another embodiment, and FIG. Figure 2 (B) is similar to Figure 2 (A
), FIG. 3 is a schematic cross-sectional view showing an apparatus for another method, and FIGS. 4(A) and 4(B) show a conventional example. 1... Drawing forming device, 2, 32... Female mold (upper mold),
3.21.33...male mold (lower mold), 3a...portion with poor squeezing property, 4...hollow pipe, 5...cavity part, 6.
11... Pipe body, 7... Base material, 9... Skin material, 12... Skin member, 22.26.2
7... Piece, 25.28... Guide pin, 23.29.34... Cylinder, 24, 30 a, 30 b---Rod, D...
・Interior materials

Claims (1)

[Claims] 1. A skin material having at least a base material is interposed between the male mold and the female mold to clamp the mold, and the mold drawing formed on the mold surface of either the male mold or the female mold is applied to the skin. In the method of inverting the material,
A method for drawing an interior material, characterized in that pressure is applied to a portion where the drawing reversal of the mold drawing is thin or a portion where the drawing reversibility of the mold drawing is poor using a means other than the pressure caused by the mold clamping. 2. The method for drawing and forming an interior material according to claim 1, wherein the means other than the pressure caused by the mold clamping is air pressure applied from a mold having no drawing surface. 3. The squeezing of the interior material according to claim 1, characterized in that the means other than the pressure caused by the mold clamping is performed by a piece having a pressing means formed on a mold having no die squeezing surface. Formation method. 4. One of the male and female molds is provided with a drawing surface having a large number of small holes, and the other mold is provided with a closed mold, a pressing die for pressing the drawing surface, and compressed air supply means. A skin material and a cushioning material are interposed between the male and female molds, the molds are clamped, and compressed air is supplied by a compressed air supply means to reverse the mold drawing on the surface of the skin material, and then the pressing mold is pressed. A method for forming an interior material by joining the base material placed on the pressing die, the skin material and the cushion material. 5. In a drawing forming device for interior materials that clamps and forms male and female molds and inverts the drawing to the skin material, a drawing surface with a large number of small holes formed in one mold, and a drawing surface with many small holes formed in the other mold. An apparatus for forming an interior material by applying pressure to at least a portion of the formed die drawing surface that is different from the direction of clamping pressure of the upper and lower dies. 6. The interior material drawing forming apparatus according to claim 5, wherein the means for applying pressure is pressure generated by compressed air from a hollow pipe formed in a mold having no drawing surface. . 7. The drawing of an interior material according to claim 5, wherein the means for applying pressure is a piece provided with a pressing means formed on the mold surface of a mold having no drawing surface. Forming device.