JP5325552B2 - Center armrest for vehicle with built-in insert and method for forming the same - Google Patents

Description

The present invention relates to a foam-molded article with a built-in insert and a molding method thereof, and more particularly, a center armrest of a vehicle with a built-in insert that prevents formation of an air pocket due to a polyurethane raw material that grows and foams being diverted by the insert. The present invention relates to the molding method.

  In general, in the molding of polyurethane foam molded products with foam molding dies, the gas generated from the foaming polyurethane raw material and the air in the foam molding die are easily trapped in the cavity surface of the upper mold by the polyurethane raw material and easily become an air reservoir. A depression may be formed on the surface of the foam molded product due to the air accumulation.

  In particular, in a foam-molded product incorporating an insert, when the polyurethane raw material injected into the lower mold expands and rises, the polyurethane raw material is obstructed by the insert and is difficult to rise uniformly. In particular, when a part of the insert is formed of a plate-like body and the plate-like body is arranged in a direction that inhibits the rise due to the foaming growth of the polyurethane raw material, the polyurethane raw material cannot rise uniformly.

  A situation in which the polyurethane raw material expands and grows will be described with reference to FIG. The polyurethane raw material P injected into the cavity surface of the lower mold 51 of the foam molding die is foamed and grown, and the upper position P2 from the position P1 where the upper surface is in contact with the lower surface of the flat portion 54a of the base 54 constituting the insert. , Going up to P3, P4. At this time, the rising polyurethane raw material P is diverted at the flat surface portion 54a and merged above the flat surface portion 54a, but the merged portion rises later than the other portions by the amount of wrapping around the flat surface portion 54a. To do. As a result, gas and air are easily trapped in the merged portion, and the air reservoir 53 is easily formed on the cavity surface 52 a of the upper mold 52. The air reservoir 53 is reduced by the foaming pressure of the polyurethane raw material P, but remains as a depression on the surface of the foam. As a method for preventing the formation of such a depression, various proposals relating to a method for forming a foam molded product incorporating an insert have been made.

  In “a method for producing a foam-molded product with a built-in insert and a foam-molding die” disclosed in Patent Document 1, a plate-like body constituting the insert is arranged so that its left-right direction is the up-down direction. The face part of the body does not hinder the foaming rise of the foaming raw material. Further, it is possible to perform good molding even in a molded product that requires the appearance of both the front and rear surfaces and the feel of the touch like the rear center armrest.

Further, in the “sheet pad molding mold and manufacturing method” disclosed in Patent Document 2, a linear member is disposed near the cavity surface of the upper mold of the foam molding mold, and the linear member causes a lack of thickness. In order to prevent this from occurring, a plurality of concave grooves extending across the linear member are arranged in parallel in the longitudinal direction of the linear member on the cavity surface of the upper mold. Due to the concave grooves, the liquid flow of the foaming raw material is improved, so that the occurrence of a lack of wall is prevented in advance.
JP-A-8-300374 (see [Summary]) JP 2007-98776 A (see [Summary])

  However, in the manufacturing method of Patent Document 1, since it is necessary to arrange the plate-like body so that the direction in which the plate-like body extends is in the vertical direction, depending on the shape of the foam molded product, for example, the rear center armrest having a cup holder In some cases, there is a problem with demolding. That is, in the rear center armrest, support shafts for rotatably supporting the armrest are provided at the left and right ends of the plate-like body in the same direction as the direction in which the plate-like body of the insert extends. Therefore, disposing the left and right end portions of the plate-shaped body so as to face in the vertical direction means that the concave portion for the cup holder is arranged not in the vertical direction but in the horizontal direction, and forming the concave portion. The convex part of the mold must be provided so as to face the horizontal direction. Then, the convex part becomes an undercut part in the demolding of the foam molded product, and a problem that a complicated mold structure must be adopted to avoid the undercut occurs. Moreover, since foam molding is performed in a state where the left and right of the armrest are in the vertical direction, the molded product has different foam densities on the left and right. Even if the foam density is allowed to be different in the vertical direction or the front-rear direction, the density difference in the left-right direction is uncomfortable and unacceptable.

  Further, in the manufacturing method of Patent Document 2, a plate-like body different from the linear member is arranged even if it is effective in improving the liquid flow damaged by the linear member arranged near the cavity surface of the upper mold. It is unclear whether there is a similar effect in the case where it is done. Even if it is effective, the upper groove is formed with multiple ridges on the surface of the foamed molded product, so the front and back surfaces and the feel are good as in the case of the rear center armrest. In the foam-molded product that needs to be, it becomes a new problem that the protruding portion replaces the lacking portion.

The present invention has been made paying attention to such a problem. The object of the present invention is to provide a center armrest of a vehicle with a built-in insert that prevents an air reservoir from being formed above the insert, and its It is to provide a molding method.

Invention of the center armrest inserts built for a vehicle according to claim 1 to solve the above problem, in the vehicle center armrest that incorporates the insert, the insert is flushed polyurethane raw material increases in foam growth min A delay member having a cross-sectional shape that tapers in a direction in which the polyurethane raw material for foaming and growing for delaying the timing until joining is attached is mounted.

According to a second aspect of the present invention, in the center armrest of the vehicle with a built-in insert according to the first aspect, the delay member is mounted on the back side of the insert in a direction in which polyurethane raw material is foamed and grown. To do.

According to a third aspect of the present invention, in the center armrest of the vehicle with a built-in insert according to the first or second aspect, at least a part of the insert is formed of a plate-like body, and the delay is provided on one surface of the plate-like body. A member is mounted.

According to a fourth aspect of the present invention, in the foam molded product with a built-in insert according to any one of the first to third aspects, the delay member has air permeability.

請 Motomeko 5 to invention the forming method of the center armrest inserts built vehicle description, in the molding method of the center armrest inserts internal of the vehicle, said insert at least partially formed by plate-like body, the plate-like by setting the insert fitted with a delay member having a cross-sectional shape which is tapered on the upper surface of the body in the foaming mold, the polyurethane raw material rises in growth foamed is diverted at the lower surface of the plate-like member joins In order to delay the timing until it is done, it flows along the side surface of the delay member and merges above the delay member.

(Function)
According to the center armrest of the vehicle with a built-in insert according to the present invention, the polyurethane raw material for delaying the timing at which the polyurethane raw material that grows and grows after being split by the insert has a cross-sectional shape that tapers in the direction of foaming and growing. A delay member having the insert is mounted on the insert, and both the insert and the delay member are built in. Therefore, a hollow due to an air reservoir is not formed on the surface of the center armrest of the vehicle, and the center armrest of the vehicle having a good appearance can be provided.

Further, in the method for forming a center armrest for a vehicle with a built-in insert according to the present invention, at least a part of the insert is formed of a plate-like body, and a delay member having a tapered cross-sectional shape is mounted on the upper surface of the plate-like body. Set the insert in the foam mold. The polyurethane raw material to grow foamed is raised along the side of the delay member to delay the timing to merge diverted at the lower surface of the plate-like body, and so as to merge in above the delay member. Therefore, there is provided a method for forming a center armrest of a vehicle that incorporates an insert that can prevent air entrainment and prevent the formation of an air reservoir even when an insert partly composed of a plate-like body is used. Can be provided.

According to the present invention, since the polyurethane raw material that is diverted and grown by the plate-like member that constitutes a part of the insert is delayed in the merging by the delay member and joined without involving air, It is possible to provide a vehicle center armrest with a built-in insert that prevents an air reservoir from being formed upward, and a method for forming the same.

(Embodiment)
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a foam molded product with a built-in insert and a molding method embodying the present invention will be described below with reference to FIGS. In addition, about the same structure as a prior art, the same code | symbol used in the description shall be used.

  As shown in FIG. 1, the center armrest 1 of this embodiment as a foam-molded product with a built-in insert has a built-in insert 20 inside a foamed body 2 formed by foaming soft polyurethane, and a pair of left and right side portions of the insert 20. The outer surface of 54b and the mounting shaft 55 fixed to the side surface portion 54b are exposed to the outside. The center armrest 1 is disposed at the use position or the retracted position by the mounting shaft 55 being rotatably supported by, for example, a support portion provided in a recess of the rear seat center. Since the center armrest 1 of this embodiment has a cup holder, a concave portion 3 for the cup holder is formed on the upper surface 1a in the used state. The center armrest 1 is covered with a skin material, but in FIG. 1, this skin material is removed.

  As shown in FIG. 2, the insert 20 includes a base portion 54 made of a press-formed steel plate-like body, an end portion welded to the base portion 54, and a steel wire rod 56 having a substantially U-shape as a whole. It is formed with. The base portion 54 has slope portions 54d formed at both ends of the flat portion 54a, and side flat portions 54c are formed at respective end portions of the slope portion 54d. Furthermore, a side surface portion 54b extending in a direction orthogonal to the side plane portion 54c is formed at the end of each side plane portion 54c. As described above, the pair of attachment shafts 55 are fixed to the outer surface of each side surface portion 54b. Three reinforcing members 56 a are welded to the wire 56 in order to reinforce the rigidity of the wire 56.

  The delay member 10 mounted on the upper surface of the base portion 54 is a soft polyurethane foam having a parabolic tapered cross section, the width is equal to the base portion 54, and the height is the upper surface 1 a of the center armrest 1. It is formed lower. A lower portion of the delay member 10 is formed by a recess 10b and leg portions 10c on both sides thereof. When the leg portion 10c is placed on the side flat surface portion 54c of the base portion 54, the concave portion 10b accommodates the slope portion 54d and the flat surface portion 54a, and the lower surface of the concave portion 10b comes into contact with the flat surface portion 54a. . Further, the overall length of the delay member 10 is slightly longer than the length between the inner surfaces of the pair of side surface portions 54 b of the base portion 54. Therefore, when the delay member 10 is mounted on the base portion 54, the end portions 10a at both ends of the delay member 10 are in close contact with the inner surface of the side surface portion 54b, and the delay member 10 is slightly elastically compressed. Therefore, the delay member 10 does not easily fall off the base 54. Note that the bottom surface of the delay member 10 may be adhered to the top surface of the base portion 54 using a double-sided tape adhesive or adhesive.

  Next, in the molding of the foam 2 containing the insert 20 using the foam molding die 50, the polyurethane raw material P is injected into the lower die 51 in which the insert 20 is set, and the upper die 52 is the die against the lower die 51. The closed state will be described with reference to FIGS.

  First, the foam mold 50 of this embodiment will be briefly described. In the foam molding die 50, a lower die 51 and an upper die 52 are connected so as to be openable and closable by a hinge portion (not shown). The upper mold 52 is provided with a convex portion 52c for forming the concave portion 3 for the cup holder. The lower mold 51 and the upper mold 52 are closed by the parting surface PL51 of the lower mold 51 and the parting surface PL52 of the upper mold 52. A concave parting surface 51b is formed on a part of the parting surface PL51, and a convex parting surface 52b is formed on a part of the parting surface PL52. In each of the parting surfaces 51b and 52b, an insert A recess (not shown) for accommodating and positioning the 20 mounting shafts 55 is formed. Further, a support protrusion 51 a that supports the end of the wire 56 of the insert 20 is provided on the lower mold 51.

  The set of the insert 20 with respect to the lower mold 51 is such that, in the lower mold 51 in the mold open state, the mounting shaft 55 of the insert 20 is positioned in the recess of the parting surface 51b and the end of the wire 56 is supported by the support protrusion 51a. Is done. At this time, the delay member 10 is mounted on the base 54 of the insert 20 in advance. Then, since the delay member 10 is disposed on the upper surface of the base portion 54, the polyurethane raw material P is prevented from flowing into the upper surface of the base portion 54 as will be described later.

  Next, the situation where the delay member 10 delays the timing at which the polyurethane raw material P splits and joins will be described with reference to FIG. As shown in FIG. 5, when the upper surface of the polyurethane raw material P rising as a result of foaming growth reaches a position P <b> 1 where it abuts against the lower surface of the flat portion 54 a or the like, the polyurethane raw material P is diverted to the left and right of the base portion 54. Furthermore, the polyurethane raw material P continues to grow, and its upper surface rises from position P1 to position P2 and position P3. At this time, since the polyurethane raw material P rises along the side surface of the delay member 10, the flow is disturbed by the base portion 54, and it is possible to prevent the gas and air from being entrained in the joining portion. And in the position P3 near the top part of the delay member 10, the polyurethane raw material P separated into the right and left merges and reaches the position P4. Thus, the amount of gas generated from the polyurethane raw material P whose merging is delayed is small. Further, the upper surface of the polyurethane raw material P is not formed with a recess for entraining gas or the like. Therefore, until the upper surface of the polyurethane raw material P comes into contact with the cavity surface 52a of the upper mold 52, gas and the like are uniformly dispersed by being discharged from the parting surface.

  Therefore, in order to prevent the concave portion from being formed on the upper surface 1 a of the center armrest 1, the delay member 10 should have a height that reaches the cavity surface 52 a of the upper mold 52. However, if it does in this way, the feeling in the upper surface 1a of the center armrest 1 will differ between the feeling by the delay member 10, and the feeling of another part, and is unpreferable. Therefore, the delay member 10 has a height that is lowered by about 1 to 3 cm from the upper surface 1 a of the center armrest 1.

  In addition, since the delay member 10 of the present embodiment is formed of a flexible polyurethane foam having air permeability, when the polyurethane raw material P rises along the side surface of the delay member 10, a part of the gas or the like is part of the delay member. 10 is absorbed from the surface to the inside. And the air which was in the delay member 10 is pushed by the gas absorbed inside, etc., and is discharged | emitted upwards. That is, an effect equivalent to that gas or the like entering the inside from the side surface of the delay member 10 is replaced and discharged upward appears. Therefore, when the polyurethane raw material P rises along the side surface of the delay member 10, gas or the like is not involved at the tip of the polyurethane raw material P, so that the gas flows into the junction where the polyurethane raw material P joins above the delay member 10. And the like are prevented from being involved.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) In the above embodiment, the delay member 10 is mounted on the back side in the direction in which the polyurethane raw material P foams and grows in the base portion 54 made of the insert 20 plate-like body, and the center armrest is formed by the foam body 2 in which the insert 20 is incorporated. 1 was formed. Therefore, since the delay member 10 delays the timing at which the polyurethane raw material P is divided and merged, and avoids air entrainment at the merged portion, it is excellent in appearance in which the formation of an air pool caused by the insert 20 is prevented in advance. It is possible to provide a foam-molded product incorporating the inserted insert.

  (2) In the said embodiment, the cross section of the delay member 10 was made into the parabola shape tapering in the direction in which the polyurethane raw material P foams and grows. Therefore, when the divided polyurethane raw material P rises along the delay member 10 and merges above the delay member 10, the merged material does not collide with each other, but gradually merges while rising. Therefore, since the hollow by an air pocket is not formed in the junction part, the foaming molded product which incorporates the insert excellent in the external appearance can be provided.

  (3) In the said embodiment, the delay member 10 was formed with the foam of the soft polyurethane which has air permeability. Therefore, when the polyurethane raw material P rises along the side surface of the delay member 10, a part of the gas or the like is absorbed by the delay member 10, and the gas or the like is not caught at the tip portion of the polyurethane raw material P. Therefore, it is possible to provide a foamed molded article having a built-in insert with an excellent appearance without air accumulation, in which gas or the like is prevented from being caught in the joining portion where the polyurethane raw material P joins above the delay member 10. .

  (4) In the above embodiment, when the delay member 10 is mounted on the base 54 made of a plate-like plate of the insert 20 and the insert 20 is set on the lower mold 51, the axial direction of the pair of attachment shafts 55 is horizontal. Arranged to face. At this time, the polyurethane raw material P which grows and grows is divided and raised by the base 54 made of a plate-like body, but the polyurethane raw material P can be joined above the delay member 10 without involving gas or the like. Accordingly, since the formation of an air pool by the insert 20 is prevented, unlike the conventional technique, the protrusion 52c for forming the recess 3 for the cup holder can be arranged so as not to be an undercut. A method for molding a foam molded article can be provided.

(Example of change)
In addition, the said embodiment can also be changed and actualized as follows.
The cross-sectional shape of the delay member 10 is a parabola, but as shown in FIGS. 6A to 6C, a triangular shape, a trapezoidal shape, a rectangular shape, or the like, rounded corners thereof, FIG. 6D As shown in the figure, it should be an ellipse half. Furthermore, as shown in FIGS. 6E and 6F, the widths of the base 54 and the delay member 10 are made different.
The delay member 10 is formed of a soft polyurethane foam having air permeability, but is formed by bonding a nonwoven fabric or urethane foam chip with a binder.
The delay member 10 has air permeability, but is covered with a surface layer that does not have air permeability. Or, the inside should not be porous to allow ventilation.
The delay member 10 is formed of a foam of soft polyurethane, but is formed of a foam such as hard polyurethane, polyethylene, polypropylene, or polystyrene.
・ Although the foam molded product with a built-in insert is used as the center armrest of the vehicle, it should be an armrest that is rotatably supported on the side of the seat back.

The perspective view which shows the center armrest of embodiment of this invention. The perspective view which shows the insert and delay member in embodiment. The partial cross section figure which shows the foaming mold where the insert was set in the execution form. FIG. 4 is a partial sectional view taken along arrow AA in FIG. 3. The partial cross section figure which shows typically the flow of the polyurethane raw material delayed by the delay member in this embodiment. (A)-(f) is sectional drawing which shows the modification of a delay member. In a prior art, the partial cross section figure which shows typically the state where the flow of a polyurethane raw material is disturbed by insert.

Explanation of symbols

  P: Raw material of polyurethane, 1 ... Center armrest, 10 ... Delay member, 20 ... Insert, 50 ... Foam mold.

Claims (5)

In a center armrest of a vehicle incorporating an insert, the insert is tapered in the direction in which the polyurethane raw material for foaming growth grows to delay the timing until the polyurethane raw material that rises by foaming grows and splits and merges. A center armrest for a vehicle with a built-in insert , wherein a delay member having a cross-sectional shape is mounted. The center armrest of a vehicle with a built-in insert according to claim 1, wherein the delay member is attached to a back side of the insert in a direction in which polyurethane raw material is foamed and grown. The center armrest of a vehicle with a built-in insert according to claim 1 or 2, wherein at least a part of the insert is formed of a plate-like body, and the delay member is mounted on one surface of the plate-like body. . The center armrest of a vehicle with a built-in insert according to any one of claims 1 to 3 , wherein the delay member has air permeability. In a method for molding a center armrest of a vehicle with a built-in insert, the insert is formed by a foam molding die, wherein at least a part of the insert is formed of a plate-like body and a delay member having a tapered cross-sectional shape is mounted on the upper surface of the plate-like body. by setting within the polyurethane raw material rises in growth foamed to flow along the sides of the delay member to delay the timing to merge diverted at the lower surface of the plate-like member, the delay member A method for forming a center armrest of a vehicle with a built-in insert, characterized in that the merging is performed above the upper part of the vehicle .

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