JP5244426B2 - Skin material insert molding apparatus and molding method - Google Patents

Description

  The present invention relates to a skin material insert molding apparatus for molding a resin molded article having a surface of a resin base material coated with a skin material, and a molding method using the skin material insert molding apparatus.

2. Description of the Related Art Conventionally, for example, resin molded products in which a resin base material is coated with a skin material are used as automobile interior parts, home appliances, building materials, and the like.
And as a skin material insert molding apparatus which shape | molds such a resin molded product, what was described in patent document 1 etc. is known, for example.
This conventional apparatus includes a pair of male and female fixed molds and movable molds. A skin material is set in advance in a cavity space formed between the two molds, and a resin is injected on the back side of the skin material to form. To do.
In such a conventional technique, the nozzle for injecting the resin is generally provided in a fixed mold that does not move, and the nozzle is arranged so that resin leakage from the nozzle does not occur on the surface of the product. Is set on the back side of the skin material of the resin molded product.
Accordingly, the skin material is set on the movable molding surface (cavity surface), and the resin is injected from the fixed nozzle to the back surface side of the skin material. In addition, when the mold is opened, the resin molded product adheres to the molding surface (core surface) of the fixed mold, so the ejector pin that pushes the resin molded product away from the molding surface can be moved to the stationary mold. It was the structure provided in.
JP 2001-322142 A

  However, in the above-described prior art, the fixed mold is provided with the nozzle for injecting the resin, the ejector pin for moving the resin molded product away from the molding surface, and the drive mechanism for driving the ejector pin. This has led to increased complexity, which has led to longer mold production days and higher production costs.

  The present invention has been made paying attention to the above-described conventional problems, and can simplify the structure of the fixed mold, thereby reducing the number of mold production days and the production cost. An object of the present invention is to provide a skin material insert molding apparatus and a molding method.

In order to achieve the above-mentioned object, the invention described in claim 1 is a skin material insert molding device for molding a resin molded product in which the surface of a resin base material is coated with a skin material, and the first molding surface And a second mold surface that is disposed opposite to the fixed mold and that forms a cavity space filled with resin between the fixed mold and the first mold surface of the fixed mold. A movable mold having a tip protruding from the first molding surface, a nozzle provided in the fixed mold so that resin can be injected into the cavity space, and a second mold surface provided in the movable mold. A product extruding device having an extruding member movable in a direction projecting from the second molding surface to separate the resin molded product from the second molding surface , and projecting into the cavity space from the second molding surface of the movable mold , along the first molding surface during clamping The resin enters the surface side of the skin material from the nozzle insertion hole when the resin is injected from the nozzle around the nozzle insertion hole formed so that the nozzle can be inserted in the arranged skin material. A skin material insert comprising: a skin pressing member formed so as to be able to be pressed and capable of allowing the resin injected from the nozzle to move in the outer circumferential direction of the nozzle. A molding apparatus was used.

  The invention according to claim 2 is the skin material insert molding device according to claim 1, wherein a plurality of columnar skin presser pins arranged in a circumferential shape surrounding the nozzle are used as the skin presser member. A skin material insert molding apparatus characterized by the above.

Invention of Claim 3 is a shaping | molding method which shape | molds the said resin molded product using the skin material insert molding apparatus of Claim 1 or Claim 2, Comprising: The said nozzle is inserted in the nozzle insertion hole of the said skin material A skin material setting step in which the skin material is arranged along the first molding surface of the fixed mold, and the movable mold is moved toward the fixed mold, and a cavity is formed between both molds. A space is formed and around the nozzle insertion hole of the skin material by the skin pressing member provided so as to protrude from the second molding surface of the movable mold into the cavity space, when the resin is injected from the nozzle wherein the clamping step for pressing so that the resin can be prevented from the nozzle insertion hole from entering the surface side of the skin material, the resin is injected from the nozzle, the back surface of said surface material in said cavity And a resin injection step of filling the resin, the mold opening step of moving the movable mold in the direction away from said movable die, a molding method which is characterized in that execution.

In the skin material insert molding apparatus of the present invention, first, the skin setting step is executed, and the skin material is set by bringing the surface side of the skin material into contact with the first molding surface of the fixed mold. At this time, the skin material is set so that the nozzle protruding from the first molding surface of the fixed mold is inserted into the nozzle insertion hole of the skin material.
Next, a mold clamping process is performed, and the movable mold is moved toward the fixed mold to form a cavity space between the two molds. In this clamping state, the skin pressing member provided on the movable mold presses the periphery of the nozzle insertion hole of the skin material against the first molding surface.

Next, a resin injection step is executed to inject the resin from the nozzle, and fill the resin on the back surface side of the skin material in the cavity space. At this time, since the nozzle is inserted into the nozzle insertion hole and protrudes to the back surface side of the skin material, the back surface side of the skin material is filled with resin. Further, in the skin material, since the periphery of the nozzle insertion hole is pressed against the first molding surface in a circumferential shape by the skin pressing member, the periphery of the nozzle insertion hole of the skin material is turned up to the surface side of the skin material. It is possible to prevent the resin from wrapping around.
And after hardening of resin, a mold opening process is performed, a movable mold | type is separated from a fixed mold | type, and a resin molded product is separated from a 1st molding surface.

  As described above, in the present invention, the movable die is provided with the extrusion device, and the skin material is set on the first molding surface of the stationary die. However, the nozzle provided on the stationary die is in the nozzle insertion hole of the skin material. Since it is inserted and protrudes to the back surface side of the skin material in the cavity space, the resin can be injected onto the back surface of the skin material to form the base material when the resin is injected.

  Therefore, while providing the nozzle for injecting the resin to the fixed mold, the movable member is provided with the extrusion member for separating the resin molded product from the mold, so that the nozzle and the extrusion device are provided only for the fixed mold. Therefore, simplification of the mold structure can be achieved. Therefore, it is possible to provide a skin material insert molding apparatus that can reduce the number of days for mold production and the production cost.

  In addition, when clamping the mold, the periphery of the nozzle insertion hole in the skin material is pressed in a circumferential shape by the skin pressing member, and the tip of the nozzle is placed on the back side of the skin material, so resin is injected from the nozzle. When this is done, it is possible to prevent the resin from turning into the surface side of the skin material by turning over at the periphery of the nozzle insertion hole of the skin material. Therefore, even if the skin material is set on the fixed mold, a resin molded product of good quality can be obtained without the resin wrapping around the surface of the skin material.

  Furthermore, in the invention described in claim 2, since the plurality of columnar skin pressing pins arranged in a circumferential shape surrounding the nozzle are used as the skin pressing member, it is easy to use an existing product and reduce costs. In addition, the function of pressing the skin material and the function of not hindering the flow of the resin injected from the nozzle can be easily obtained.

In the molding method according to claim 3, by using the skin material insert molding apparatus according to claim 1 or 2, molding is performed according to the above-described process procedure, thereby shortening the number of mold production days and the production cost. Reduction is possible.
In addition, when the resin is injected from the nozzle, it can be turned over at the periphery of the nozzle insertion hole of the skin material to prevent the resin from entering the surface side of the skin material. In addition, it is possible to obtain a resin molded product of good quality in which the resin does not wrap around the surface of the skin material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The skin material insert molding device according to the embodiment is a skin material insert molding device for molding a resin molded product (SE) in which the surface of a resin base material (2) is covered with a skin material (1). The fixed mold (3) on which the molding surface (31) is formed and the first mold surface (31) of the fixed mold (3) arranged in a clamped state, facing the fixed mold (3). Between the movable mold (4) having a second molding surface (41) forming a cavity space (5) filled with resin, and a tip projecting from the first molding surface (31), A nozzle (61) provided in the fixed mold (3) so that resin can be injected into the space (5) and a movable mold (4) provided from the second molding surface (41) to the resin molded product ( (2) An extruding member that can move in a direction protruding from the second molding surface (41) to separate SE) 2) and a skin material projecting from the second molding surface (41) of the movable mold (4) and disposed along the first molding surface (31) during clamping In (1), the periphery of the nozzle insertion hole (11) formed so that the nozzle (61) can be inserted is formed so as to be able to be pressed, and the resin injected from the nozzle (61) in the outer peripheral direction of the nozzle A skin material insert molding device comprising a skin pressing member (43) formed to allow movement.

Below, based on FIGS. 1-7, the skin material insert molding apparatus A of Example 1 of the best embodiment of this invention is demonstrated.
The skin material insert molding apparatus A is for molding the resin molded product SE shown in FIG. 5, and the resin molded product SE is obtained by coating the surface of the resin base material 2 with the skin material 1. For example, it is used for automobile interior parts, home appliances, building materials and the like.

First, the structure of the skin material insert molding apparatus A will be described.
The skin material insert molding apparatus A according to the first embodiment includes a fixed mold 3 and a movable mold 4 as shown in FIG.
The fixed mold 3 includes a cavity surface (first molding surface) 31 corresponding to a female mold for molding the resin molded product SE, while the movable mold 4 has a core surface (second molding) facing the cavity surface 31. Surface) 41, and when both are clamped, a cavity space 5 filled with resin is formed between the cavity surface 31 and the core surface 41 (see FIG. 3).

The fixed mold 3 is provided with an injection device 6 that injects the resin 20 and a nozzle 61 that is an injection port of the resin at the time of injection.
As shown in FIG. 6, the tip surface 62 of the nozzle 61 protrudes by a dimension L from the cavity surface 31, and the dimension L is larger than the thickness dimension of the skin material 1. .
Further, as shown in FIG. 6, a tapered inclined surface 63 having a tapered shape at the tip is formed at the tip of the nozzle 61.

  The skin material 1 is provided with a nozzle 61 having a slightly larger diameter than the nozzle 61 at a position overlapping the nozzle 61 when the surface 12 (see FIG. 6) is brought into contact with the cavity surface 31. A nozzle insertion hole 11 that can be inserted is opened.

  Returning to FIG. 1, the movable die 4 is provided with a product extrusion device 7. The product extruding device 7 is a device that presses the base material 2 of the resin molded product SE when the resin molded product SE is separated from the core surface 41 of the movable mold 4. , A movable panel 71 movable in the left direction, and a plurality of pushing members 72 supported by the movable panel 71 and provided so as to be movable along the through holes 42 provided in the movable mold 4.

Further, a cylindrical skin pressing pin (skin pressing member) 43 protrudes from the core surface 41 of the movable mold 4.
The skin pressing pins 43 are integral with or separate from the movable die 4 and, as shown in FIG. 7, a plurality of skin pressing pins 43 are arranged at substantially equal angles around the axis P coaxial with the nozzle 61 (in the case of this embodiment 1, 8 Book) is provided. When the fixed mold 3 and the movable mold 4 are clamped as shown in FIG. 3 and FIG. 4, the tips of these skin presser pins 43 have nozzle insertion holes 11 in the skin material 1 as shown in FIG. 6. Is protruded from the core surface 41 by a dimension that can be pressed against the cavity surface 31.

Next, a molding procedure will be described using the skin material insert molding apparatus according to the first embodiment.
In the first embodiment, a skin setting process, a mold clamping process, a resin injection process, a mold opening process, and a resin molded product removal process are executed in order.

(Skin set process)
In the skin setting step, as shown in FIG. 1, the skin material 1 is fixed to the surface 12 (see FIG. 3) side as shown in FIG. The skin material 1 is set in contact with the cavity surface 31 of the mold 3. At this time, as shown in FIG. 6, the nozzle 61 is inserted through the nozzle insertion hole 11 of the skin material 1.

(Clamping process)
In the mold clamping step, the movable mold 4 is moved toward the fixed mold 3 in the direction indicated by the arrow M1 in FIG. 2, and the cavity space 5 is formed between the molds 3 and 4 as shown in FIG. In this mold clamping step, the skin pressing pin 43 provided on the movable mold 4 presses the peripheral edge of the nozzle insertion hole 11 of the skin material 1 against the cavity surface 31 as shown in FIG. In this case, as shown in the figure, the skin pressing pin 43 presses the skin material 1 with a strength that causes a slight compression deformation of the skin material 1.

(Resin injection process)
In the resin injection process, the molten resin 20 shown in FIG. 4 is injected from the nozzle 61. As a result, in the cavity space 5, the resin 20 is filled on the back surface 13 side of the skin material 1.
At this time, since the nozzle 61 protrudes on the back surface 13 side of the skin material 1, the resin 20 is smoothly filled on the back surface 13 side of the skin material 1. In addition, since the tapered inclined surface 63 is formed at the tip portion of the nozzle 61, the flow of the resin 20 is made smoother.
Furthermore, since the periphery of the nozzle insertion hole 11 in the skin material 1 is pressed against the cavity surface 31 circumferentially by the skin pressing pin 43, the periphery of the nozzle insertion hole 11 of the skin material 1 is turned up at the time of resin injection. Thus, it is possible to prevent the resin from flowing into the surface 12 side of the skin material 1.

  In addition, since the pressing of the nozzle insertion hole 11 of the skin material 1 is performed by a plurality of cylindrical skin pressing pins 43 arranged at intervals in the circumferential direction, the flow of resin from the nozzle 61 to the cavity space 5 Is made smoothly without being obstructed by the skin pressing pin 43.

(Mold opening process)
When the resin 20 is cured, a mold opening process is performed, and the movable mold 4 is moved in the direction of the arrow M2 in FIG.
In this case, the resin molded product SE is attached to the movable mold 4 having the core surface 41 on the base material 2 side.

(Resin molded product removal process)
In the resin molded product removal step, the product extrusion device 7 is operated. Thereby, the plurality of extruding members 72 push out the base material 2 on which the resin 20 is cured, and the resin molded product SE is separated from the movable mold 4.

  In the resin molded product SE, a portion 21 protruding from the nozzle insertion hole 11 of the skin material 1 is cut as necessary. Further, in the skin material 1, the base material 2 is exposed at a portion where the nozzle insertion hole 11 is opened. However, the nozzle insertion hole 11 is placed at a position where the user cannot touch it when using the resin molded product SE. By disposing, a cover that covers this portion can be made unnecessary.

As explained above, in the skin material insert molding apparatus A of Example 1, the effects listed below are obtained.
1) While providing the nozzle 61 for injecting resin to the fixed mold 3 and providing the product extrusion device 7 for separating the resin molded product SE on the movable mold 4, the nozzle 61 and the product extrusion device 7 are provided only on the fixed mold 3. Compared with the provision of the above, it is possible to simplify the mold structure, and thus it is possible to provide a skin material insert molding device that can reduce the number of mold production days and the production cost. .
2) Although the product extruding device 7 is provided in the movable mold 4, the skin material 1 is set in the fixed mold 3, so that the extruding member 72 pushes the base material 2 in the resin molded product removing step. The surface 12 of the skin material 1 that becomes the surface of the resin molded product SE is not damaged.
3) Although the skin material 1 is set on the cavity surface 31 of the fixed mold 3, the nozzle 61 provided in the fixed mold 3 passes through the nozzle insertion hole 11 of the skin material 1 and the back surface of the skin material 1 in the cavity space 5. Therefore, when the resin 20 is injected, the base material 2 can be formed by injecting the resin 20 onto the back surface 13 of the skin material 1, and the resin molded product SE can be molded.
4) At the time of mold clamping, the periphery of the nozzle insertion hole 11 of the skin material 1 is pressed circumferentially by the skin pressing pin 43, and the tip surface 62 of the nozzle 61 is disposed on the back surface 13 side of the skin material 1. Therefore, when the resin 20 is injected from the nozzle 61, the peripheral edge of the nozzle insertion hole 11 of the skin material 1 can be prevented from turning and the resin 20 can be prevented from entering the surface 12 side of the skin material 1. Therefore, even if the skin material 1 is set on the fixed mold 3, it is possible to obtain a resin molded product SE of good quality in which the resin 20 does not wrap around the surface 12 side of the skin material 1.
5) Since the plurality of skin presser pins 43 as the skin presser members are circumferentially arranged around the periphery of the nozzle insertion hole 11, the peripheral edge of the nozzle insertion hole 11 is reliably pressed all around, and the skin material is injected when the resin 20 is injected. 1 can be reliably prevented from being turned over, and the resin 20 can be spread over the entire cavity space 5 without hindering the flow of the resin 20 injected from the nozzle 61, thereby obtaining good moldability. .

  As mentioned above, although embodiment and Example 1 of this invention were explained in full detail with reference to drawings, specific structure is not restricted to this Embodiment and Example 1, and does not deviate from the summary of this invention. A degree of design change is included in the present invention.

  In the first embodiment, an example in which the female cavity surface 31 is provided as the first molding surface of the fixed die 3 and the male core surface 41 is provided as the second molding surface of the movable die 4 is shown. Depending on the shape of the molded product, the male-female shape of the molding surface may be formed opposite to the relationship shown in the first embodiment.

  In the first embodiment, the cylindrical skin presser pin 43 is shown as the skin presser member. However, the shape of the skin presser member is not limited to such a pin shape. That is, if the skin material can be pressed along the nozzle insertion hole and does not hinder the flow of the resin injected from the nozzle, the resin can be distributed in a polygonal column shape or a ring shape. For example, a material provided with slits or holes can be used.

  Further, the pushing member 72 can be provided to face the nozzle 61. In this case, when the resin 20 is cured, the skin pressing pin 43 is buried in the base material 2, but by pressing the center with the pushing member 72, the skin pressing pin 43 can be smoothly separated from the base material 2. it can.

In the first embodiment, the skin pressing pin 43 is protruded from the core surface 41 of the movable mold 4. However, such a skin pressing member may be provided integrally at the tip of the pushing member 72. Good.
That is, the skin pressing member at the tip of the pushing member 72 is projected from the core surface 41 in a state where each pushing member 72 is retracted into the movable mold 4. In this case, at the time of the extrusion operation of the product extrusion device 7, the resin pressing product SE moves substantially horizontally with respect to the movable mold 4 by pressing the base material 2 together with the other pressing members 72.
Therefore, when the resin molded product SE is separated from the movable mold 4, stress concentration is suppressed at the portion of the skin pressing member embedded in the base material 2 in the resin molded product SE. The deformation can be suppressed, and the quality and yield of the resin molded product SE can be improved.

It is explanatory drawing which shows the mold open state of the skin material insert molding apparatus A of Example 1 of the best mode of the present invention. It is explanatory drawing of the initial stage of the clamping process of the skin material insert molding apparatus A of Example 1. FIG. It is explanatory drawing which shows the clamping state of the skin material insert molding apparatus A of Example 1. FIG. It is explanatory drawing of the resin injection process of the skin material insert molding apparatus A of Example 1. FIG. It is explanatory drawing of the mold opening process of the skin material insert molding apparatus A of Example 1. FIG. It is an expanded sectional view of the principal part of the skin material insert molding apparatus A of Example 1, Comprising: The state cut | disconnected in the position of the S6-S6 line | wire of FIG. 7 is shown. It is explanatory drawing which shows the principal part of the skin material insert molding apparatus A of Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Skin material 2 Base material 3 Fixed type | mold 4 Movable type | mold 5 Cavity space 7 Product extrusion apparatus 11 Nozzle penetration hole 31 Cavity surface (1st molding surface)
41 Core surface (second molding surface)
43 Skin presser pin (skin presser member)
61 Nozzle 72 Extruded Member SE Resin Molded Product

Claims (3)

A skin material insert molding device for molding a resin molded product in which the surface of a resin base material is coated with a skin material,
A fixed mold formed with a first molding surface;
A movable mold provided with a second molding surface that is disposed opposite to the fixed mold and forms a cavity space filled with resin between the first molding surface of the fixed mold in a clamped state;
A nozzle provided on the fixed mold so that a tip protrudes from the first molding surface and is capable of injecting resin into the cavity space;
A product extruding apparatus provided with an extruding member provided in the movable mold and movable in a direction protruding from the second molding surface to separate the resin molded product from the second molding surface;
Around a nozzle insertion hole that is provided so as to protrude from the second molding surface of the movable mold into the cavity space, and is formed so that the nozzle can be inserted in a skin material arranged along the first molding surface during mold clamping. Is formed so that the resin can be prevented from entering the surface side of the skin material from the nozzle insertion hole when the resin is injected from the nozzle, and the resin injected from the nozzle A skin presser member formed to allow movement in the nozzle outer circumferential direction;
A skin material insert molding device characterized by comprising:   The skin material insert molding apparatus according to claim 1, wherein a plurality of columnar skin pressing pins arranged in a circumferential shape surrounding the nozzle are used as the skin pressing member. A molding method for molding the resin molded product using the skin material insert molding device according to claim 1 or 2,
In the state where the nozzle is inserted through the nozzle insertion hole of the skin material, the skin material setting step of arranging the skin material along the first molding surface of the fixed mold,
The skin holding member provided to project from the second molding surface of the movable mold into the cavity space while moving the movable mold toward the fixed mold to form a cavity space between both molds. A mold clamping step of pressing around the nozzle insertion hole of the skin material so as to prevent the resin from entering the surface side of the skin material from the nozzle insertion hole when the resin is injected from the nozzle ;
Resin injection step of injecting resin from the nozzle, filling the resin on the back side of the skin material in the cavity space,
A mold opening step for moving the movable mold in a direction away from the movable mold;
The molding method characterized by performing.

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