JP2010030085A - Foam molding mold and foam molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foam molding mold which has a simplified structure without making operation complicated. <P>SOLUTION: The foam molding mold 1 has an insert block 16 contained in a concave-part formation portion 17 in which a concave portion 14 of the skin 10 of a single-piece foam product S is to be formed. The insert block 16 has an acute-angle biting portion 21 capable of being bitten into a bottom joint portion 20 elongated along the circumference of the bottom 19 of the concave-part formation portion 17. The biting portion 21 is elongated along the bottom joint portion 20, and the circumferential length of the tip 21a of the acute-angle biting portion 21 is greater than that of the bottom joint portion 20. Because the insert block 16 is mounted by being pressed into the concave-part formation portion 17 through the elongation of the skin 10, it is possible to keep the bottom 19 of the concave-part formation portion 17 consistently in a tensed state in the foam molding mold 1 through the insert block 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foam molding die and a foam molding method for molding a skin-integrated foamed product having a recess (for example, a headrest or an armrest of an automobile seat).

Conventionally, there is JP-A-2003-25348 as a technology in such a field. This publication describes a method for manufacturing a headrest. On both sides of the headrest body in the headrest, concave portions are formed as an under shape, the skin of the headrest body is formed by sewing, and one end of a clip made of synthetic resin is fixed to the sewing portion of the concave portion of the skin, this clip The other end is locked to an insert block that is loaded in the pre-recessed portion. In manufacturing the headrest, first, an insert block is attached in the planned recessed portion on the side portion of the skin. The inner shape of the insert block is a shape corresponding to a concave portion as an under shape on both side portions of the headrest body. A flange portion is formed outside the insert block, and an intermediate portion of the clip is fitted into a slit formed in the flange portion, and the other end of the clip portion is locked to the flange portion.
In this state, the skin is set in the foaming mold, the foaming liquid is injected into the skin, and the pad material is integrally foamed into the skin. After foaming liquid hardening, a skin integrated foam product is taken out from a foaming mold. Then, in order to remove the insert block in the recess on the side of the skin, unlock the end of the clip with respect to the insert block, and then prevent the clip from remaining in the recess. Cut the middle part. In this way, the concave portion of the headrest is formed.

JP 2003-25348 A

  However, the conventional headrest manufacturing method described above requires the use of a synthetic resin clip for fixing the insert block in the recess, which makes the work complicated and at the same time complicates the structure of the foam mold. There is a problem such as. In addition, the clip after cutting may remain so as to jump out into the recess on the skin side.

  It is an object of the present invention to provide a foam molding die that has a simplified structure without complicating work. Another object of the present invention is to provide a foam molding method capable of simplifying the structure of the foam mold without complicating work.

To achieve the above object, the present invention provides:
In a foam molding die for molding a foam integrated product by injecting a foaming liquid into a bag-sewed skin,
The skin is provided with a recessed portion planned to be a recessed portion with a foam integrated with the skin, and a bottom hook portion extending along the periphery of the bottom portion of the recessed portion is provided,
The insert block has an insert block that is accommodated in the recessed portion, and the insert block is provided with an acute bite portion that extends along the bottom hook portion and can bite into the bottom hook portion. The length is larger than the peripheral length of the bottom hook portion.

  This foaming mold includes an insert block that is accommodated in a planned recessed portion that is a foam integrated with a skin and is intended to have a recessed portion of the skin, and the insert block extends along the peripheral edge of the bottom of the recessed portion. A sharp bite that can bite into the hook is provided, and this bite extends along the bottom hook, and the circumference of the tip of the sharp bite is larger than the circumference of the bottom hook. ing. Since such an insert block is mounted so as to be pushed into the recessed portion by utilizing the elongation of the skin, the bottom of the recessed portion is always stretched in the foaming mold by the insert block. The force with which the bottom portion is stretched can be made stronger than the force with which the skin tries to return due to the injection pressure of the foaming liquid injected in the foaming mold. Therefore, wrinkles are not generated at the bottom of the concave portion of the skin-integrated foamed product. The insert block should only be pushed into the recessed portion by using the elongation of the skin so that the sharp bite portion of the insert block bites into the bottom hook of the planned recessed portion, which may complicate the work. And the structure of the foam mold is not complicated.

  In addition, it is preferable that the inner surface surrounded by the tip of the biting portion is curved in a concave shape. By doing in this way, since the inner side surface of an insert block can be spaced apart from the bottom part of the recessed part planned part of an outer_skin | epidermis, the bottom part of a recessed part planned part can be reliably stretched without loosening during shaping | molding.

  In addition, it is preferable that the peripheral surface of the insert block is formed as an inclined surface that enters inside from the tip of the biting portion. Since the peripheral surface of the insert block can be reliably separated from the peripheral surface of the pre-recessed portion, the peripheral surface of the concave portion can be formed without wrinkles without being affected by the peripheral surface of the insert block during molding.

The present invention is a foam molding method for injecting a foaming liquid into the skin to form a foam integrated with a skin,
The insert block is accommodated in the recessed portion planned portion provided in the skin, and at this time, the sharp biting portion provided in the insert block is bitten into the bottom hook portion extending along the peripheral edge of the bottom portion of the recessed portion. Keep the bottom stretched,
Thereafter, the skin and the insert block are set in a cavity of a foaming mold, and a foaming liquid is injected into the skin to form a foam integrated with the skin.

  In this foam molding method, the sharp biting portion of the insert block is bitten into the bottom hook portion extending along the peripheral edge of the bottom portion of the planned recessed portion, and the bottom portion is maintained in a stretched state. Thereafter, the skin and the insert block are set in the cavity of the foaming mold, and a foaming liquid is injected into the skin to form a foam integrated with the skin. In such a foam molding method, the force with which the bottom is stretched can be made stronger than the force with which the skin is returned due to the injection pressure of the foaming liquid injected in the foam molding die. There is no wrinkle at the bottom. Moreover, it is only necessary to use the elongation of the epidermis to allow the sharp bite of the insert block to bite into the bottom hook of the planned recess, so that the work is not complicated, and the structure of the foam mold is reduced. There is no complexity.

  The foaming mold according to the present invention can simplify the structure without complicating the work. Further, the foam molding method according to the present invention can simplify the structure of the foam molding die without complicating the work.

  Hereinafter, preferred embodiments of a foam molding die and a foam molding method according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the foaming mold 1 has an upper mold 2 and a lower mold 3 that can be freely opened and closed. The upper mold 2 having the cavity 2a is provided with a nozzle clamp half 2b for holding the injection nozzle 26, and the lower mold 3 having the cavity 3a is provided with a nozzle clamp half for holding the injection nozzle 26. A portion 3b is provided.

  The cavity 1a of the foam mold 1 is formed by the cooperation of the cavities 2a and 3a, and the injection nozzle 2 is firmly fixed to the foam mold 1 during molding by the cooperation of the nozzle clamp halves 2a and 3a. The

  The illustrated skin-integrated foamed product S is a headrest of an automobile seat, and includes a bag-shaped skin 10, a headrest stay 11 fixed to the headrest frame, and a foaming liquid R injected into the skin 10 (see FIG. 2). The pad body 12 is cured. Further, the headrest S is provided with recesses 14 on both side surfaces of a headrest body 13 composed of the skin 10 and the pad body 12.

  In molding the headrest S having a design in which the concave portions 14 are provided on both side surfaces of the headrest body 13, the foam molding die 1 includes an insert block 16 for molding the concave portions 14.

As shown in FIGS. 2 and 3, the insert block 16 substantially matches the shape of the recess 14. The skin 10 before molding is provided with a planned recessed portion 17 in which the recessed portion 14 is planned with the skin integrated foam S. The recessed portion 17 is defined by a peripheral portion 18 and a bottom portion 19, and the peripheral portion 18 and the bottom portion 19 are joined together by a bottom hook portion (sewing portion) 20 extending along the periphery of the bottom portion 18. Yes.

  The insert block 16 accommodated in the planned recessed portion 17 is provided with an acute bite portion 21 that extends along the bottom hook portion 20 and can bite into the bottom hook portion 20. The circumferential length is larger than the circumferential length of the bottom hook portion 20.

  The insert block 16 having such a configuration is mounted so as to be pushed into the recessed portion 17 using the extension of the skin 10. As a result, the insert block 16 can keep the bottom portion 19 of the recessed portion 17 in the foam molding die 1 without any slack, and the injection pressure of the foaming liquid R injected into the foam molding die 1. By this, the force with which the bottom 19 is stretched can be made stronger than the force with which the epidermis returns. Therefore, wrinkles are not generated at the bottom 19 of the recess 14 of the skin-integrated foamed product S.

  Then, the insert block 16 is simply pushed into the recessed portion 17 using the stretch of the skin 10 so that the sharp biting portion 21 of the insert block 16 is bitten into the bottom hook portion 20 of the planned recessed portion 17. Since it is good, work is not complicated and the structure of the foaming mold 1 is not complicated.

  Further, the inner side surface 22 surrounded by the tip 21a of the biting portion 21 is curved in a concave shape. Therefore, since the inner side surface 22 of the insert block 16 can be separated from the bottom surface 19a of the bottom portion 19 of the planned recess portion 17 of the skin 10, the bottom portion 19 of the planned recess portion 17 is securely stretched without slacking during molding. I can leave.

  Further, the peripheral surface of the insert block 16 is formed as an inclined surface 23 that enters the inside from the tip 21 a of the biting portion 21. Accordingly, since the peripheral surface (inclined surface) 23 of the insert block 16 can be reliably separated from the peripheral surface 18a of the pre-recessed portion 17, without being affected by the peripheral surface 23 of the insert block 16 during molding, The peripheral surface 14a (see FIG. 1) of the recess 14 can be formed without wrinkles.

  Next, a foam molding method for molding the skin integrated foam product S will be described.

  A bag-shaped skin 10 with a headrest stay 11 protruding is prepared. The skin 10 is formed by sewing, and an injection nozzle insertion hole 25 is provided between the headrest stays 11 of the skin 10.

  Then, the insert block 16 is mounted so as to be pushed into the recessed portion 17 by utilizing the elongation of the skin 10. At this time, the sharp biting portion 21 provided in the insert block 16 is bitten into the bottom hook portion 20 extending along the periphery of the bottom portion 19 of the planned recess portion 17 so that the bottom portion 19 is stretched without slack. maintain. In such a state, the insert block 16 is difficult to drop off from the planned recessed portion 17. Further, the tip of the injection nozzle 26 is inserted from the injection nozzle insertion hole 25.

  Thereafter, the skin 10 is set in the cavity 3 a of the lower mold 3 with the insert block 16 and the injection nozzle 26 mounted. At this time, the headrest stay 11 is made to protrude from the lower mold 3. The insert block 16 is fixed so as to abut against the wall surface of the cavity 3a of the lower mold 3, and the injection nozzle 26 is placed in the nozzle clamp half 3a.

  In this state, the upper mold 2 is closed. At this time, the cavity 1a is in a sealed state, and the skin 10 is held in close contact with the wall surface of the cavity 1a by vacuum suction.

  Thereafter, the foam molding die 1 is placed on the mounting table of the foam molding apparatus, the slidable injection gun is moved toward the foam molding die 1, and the tip of the injection gun is inserted into the injection nozzle 26. In this state, by injecting the foaming liquid R into the foaming mold 1 from the injection gun, the foaming liquid R fills the skin 10 while flowing in the skin 10. Then, after the injection of the foaming liquid R is completed, the injection gun is retracted.

  After the foaming liquid R is cured, the upper mold 2 is opened, the skin integrated foam S is taken out from the lower mold 3, the insert block 16 is removed from the recess 14, and the injection nozzle 26 is removed from the headrest body 13.

  In such a foam molding method, the force with which the bottom portion 19 is stretched can be made stronger than the force with which the skin 10 tries to return due to the injection pressure of the foaming liquid R injected into the foam molding die 1. Wrinkles are not generated at the bottom 19 of the recess 14 of the product S. Moreover, it is only necessary to cause the sharp bite portion 21 of the insert block 16 to bite into the bottom hook portion 20 of the planned recess portion 17 by utilizing the elongation of the skin 10, so that the work is not complicated and foaming is performed. The structure of the mold 1 is not complicated.

  It goes without saying that the present invention is not limited to the embodiment described above. For example, the present invention can be applied to molding of an arm race provided on a vehicle seat.

It is a perspective view showing one embodiment of a foaming mold concerning the present invention. It is a principal part expanded sectional view which shows the foaming mold during shaping | molding. It is a perspective view which shows the principal part of an insert block in cross section.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Foam molding die, 1a ... Cavity, 10 ... Skin, 14 ... Recessed part, 16 ... Insert block, 17 ... Recessed part, 19 ... Bottom part, 20 ... Bottom hook part, 21 ... Biting part, 21a ... Tip of biting part , 22 ... inner surface of the insert block, 23 ... inclined surface, R ... foaming liquid, S ... foam integrated with skin.

Claims (4)

In a foam mold for molding a foam integrated product by injecting a foaming liquid into the skin sewn in a bag shape,
The skin is provided with a recessed portion scheduled to be a recessed portion in the integral foam product, and a bottom hook portion extending along the periphery of the bottom portion of the recessed portion is provided,
The insert block is accommodated in the recessed portion, and the insert block is provided with an acute bite portion extending along the bottom hook portion and capable of biting into the bottom hook portion, and the bite portion. The foam molding die characterized in that the peripheral length of the tip of the is larger than the peripheral length of the bottom hook part.   The foaming mold according to claim 1, wherein an inner surface surrounded by the tip of the biting portion is curved in a concave shape.   The foam molding die according to claim 1 or 2, wherein a peripheral surface of the insert block is formed as an inclined surface that enters inward from the tip of the biting portion. In the foam molding method for injecting the foaming liquid into the skin sewn in a bag shape to mold the skin integrated foam product,
The insert block is accommodated in the recessed portion planned portion provided in the skin, and at this time, the acute bite portion provided in the insert block is formed on the bottom hook portion extending along the peripheral edge of the bottom portion of the recessed portion. Keep it in a state where the bottom is stretched,
Thereafter, the skin and the insert block are set in a cavity of a foam molding die, and a foaming liquid is injected into the skin to mold the foam integrated foam product.