JP2578528Y2 - Integral foam molding die for insert member - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of assembling an insert member having a structural portion led out of a mold from a land surface into a split mold, and using a foamed resin filled in the split mold. The present invention relates to an integrated foam molding die of an insert member used for foam molding a molded article integrally with an insert member.

[0002]

2. Description of the Related Art As a foamed resin molded product integrally foamed with an insert member, there is a pad portion P constituting a headrest for a vehicle as shown in FIG. The pad portion P includes a headrest frame portion F including a headrest stay portion S as an insert member, the headrest frame portion F is inserted into a mold, and the headrest stay portion S is moved from the land surface of the mold to the mold. By being led out, it is foamed integrally with the headrest frame portion F.

As the molding die, in addition to the inner surface of the split die into which the headrest frame portion is inserted, a concave groove for leading the headrest stay portion out of the die continuously from the edge of the inner surface of the split die is provided. The one provided on the surface is used.

When the pad portion of the headrest is foamed using the molding die, resin leakage is likely to occur due to the formation of a gap in the mating surface between the headrest stay portion and the concave groove. In addition, the pad portion of the headrest may lose its shape due to the resin leakage, and may not be formed in a desired shape.

[0005] In particular, if the headrest stay portion has an axial portion curved and formed in a round shape with a round pipe member, there is a gap between the curved surface of the concave groove or the pipe member and the curved surface of the round shape, so that there is a gap between the two surfaces. A gap is likely to occur.

[0006]

SUMMARY OF THE INVENTION According to the present invention, even if an insert member having a component part led out of the mold, such as the above-mentioned headrest stay, is assembled into the mold by a very simple structure change, the inside of the mold is maintained. An object of the present invention is to provide an integrated foam molding die of an insert member improved so as to be able to surely and hermetically seal.

[0007]

SUMMARY OF THE INVENTION In the integral foam molding die for an insert member according to the present invention, a half-shaped receiving groove through which a component part of the insert member led out of the die from the land surface is formed, and the receiving groove is formed. An elastic seal member provided with a plurality of ridges located in the groove in the groove width direction and at a greater distance from near the edge of the inner surface of the mold is embedded in the groove in opposition to the land surface of each split mold. It is configured by mounting.

[0008]

In the integrated foam molding die of the insert member, a plurality of ridges located at a greater distance from near the edge of the inner surface of the die are led out of the land surface out of the die as the die is clamped. While compressively deforming at the component of the insert member,
Since the components of the insert member are elastically held by the respective receiving grooves of the seal member, the components of the insert member can be tightly held by the seal member so as to surround the periphery thereof.
In addition to being able to position the insert member so that it does not move in the mold, it can be assembled and inserted into the mold, as well as being able to airtightly seal the inside of the split mold to prevent resin leakage and break the foam molded product The foam can be formed into a desired shape without causing the foaming. In particular, even if the insert member has a round pipe member and has a component portion formed in a curved shape in a round shape, and the curved shape and the like have variations, the variation can be reduced by a plurality of ridges or seal members. It can be absorbed by elastic deformation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
As shown in FIG. 5, a molding die used for integrally foaming and molding a pad portion of a vehicle headrest as an insert member having a headrest frame portion having a headrest stay portion having an axis curved in an arc shape as a component as shown in FIG. Is shown.

The mold has upper and lower split molds 1 and 2,
The lower die 1 is provided with clamp mechanisms 3 and 3 for pressing the upper die 2 and fixing the die. The upper and lower dies 1 and 2 are provided with mold inner surfaces 10 and 20 that form a cavity space on their relative surfaces, and the remaining planes are formed as land surfaces 11 and 21. In the drawing, reference numeral 4 denotes a stopper mechanism for closing the hole diameter on the shaft end side of the pipe member when the headrest stay portion is formed of a pipe member as described later.

The land surfaces 11 and 21 of the molding die are provided with recesses (not shown) by hollowing out the edges of the inner surfaces 10 and 20 from the outer surfaces of the die. Further, elastic sealing members 12 and 22 are embedded and mounted inside the recess so as to face each other.

FIG. 2 shows an elastic seal member 12 (22). The seal member 12 (22) is made of an elastic material such as silicon or urethane and is formed in a flat plate shape. The plate surface of the seal member 12 (22) is provided with a receiving groove 12a for inserting the axial portion of the headrest stay. The receiving groove 12a is provided in the form of a half round groove corresponding to the axis of the headrest stay made of a round pipe member, and is curved so as to correspond to the curved axis portion of the headrest stay. As shown in FIG. 3, a plurality of ridges 12b and 12c are provided on the inner surface of the receiving groove 12a so as to extend in the groove width direction. They are provided at intervals.

When foaming the pad portion of the headrest using this molding die, first, the headrest frame portion is housed in the mold inner surface 10 of the opened lower die 1 and the headrest stay portion is received by the seal member 12. Groove 1
It is fitted and arranged with its axis aligned with 2a. After that, the upper die 2 is faced to the lower die 1 and the upper die 2 is clamped and fixed to the lower die 1 by the clamp mechanisms 3 and 3.

With the clamping of the split dies 1 and 2, the ridges 12b and 12c of the seal member 12 (22) are crushed and elastically deformed by the headrest stay, and the receiving of the seal member 12 (22) is performed. The close contact with the groove 12a holds the seal member 12 (22) so as to surround the curved portion of the headrest stay from the periphery. Therefore, not only can the headrest frame portion including the headrest stay portion be positioned and held so as not to move in the mold, and the mold inner surfaces 10, 20 of the split molds 1, 2 are tightly sealed so that resin leakage does not occur. Can be.

In particular, even if the headrest stay portion has a round pipe member having an axially curved axial portion, the ridges 12b and 12c of the seal member 12 (22) are elastically deformed, so that the headrest stay portion is deformed. Tightness can be ensured, and even if there is a variation in the axial shape, it can be absorbed and the tightness can be similarly secured.

Therefore, in this molding die, when the foamed resin filled in the mold in advance or filled after the mold is clamped through an injection port (not shown) is foamed, the pad portion of the headrest is formed into a desired shape as a foamed resin molded product. Can be foam molded.

In addition to the above configuration, the mold is provided with a stopper mechanism 4 shown in FIG. When the headrest stay portion is attached to the headrest stay portion of a pipe member having both ends opened, the headrest stay portion is formed such that the foamed resin passes from the shaft end side located in the mold to the shaft end side outside the mold via the inside of the radius. It is equipped to keep the mold airtight by preventing it from flowing out.

The stopper mechanism 4 has a pressing plate 41 having an applied surface formed of an elastic body 40 for sealing, and by attaching it to a link bar 42, the elastic body 40 for sealing is formed into a mold of the headrest stay portion S. It is equipped so that the hole diameter can be closed by pressing against the shaft end face located outside. Further, the stopper mechanism 4 is provided with a set pin 43 which is fitted into an opening of a collar portion C (see FIG. 5) provided on the axis of the headrest stay portion S, protruding from the lower mold 1, and the headrest stay portion S is provided. Pressing can be performed with a pressing pin 44 attached to the link bar 42.

[0019]

As described above, according to the integral foam molding die of the insert member according to the present invention, the ridge of the seal member is elastically deformed at the component of the insert member with the mold clamping of the split mold. The close contact with the receiving groove allows the seal member to hold around the components of the insert member from the periphery, so that not only can the insert member be positioned and held so that it does not move in the mold, but also resin leakage does not occur. The inner surface of the split mold can be tightly sealed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an integral foaming mold of an insert member according to the present invention.

FIG. 2 is a perspective view showing a seal member provided in the same type.

FIG. 3 is a cross-sectional view showing the seal member of FIG. 2 in a partially enlarged manner.

FIG. 4 is an explanatory diagram showing a stopper mechanism provided in the mold of FIG. 1;

FIG. 5 is an explanatory view showing a pad portion of a vehicle headrest as an example of a foam molded product.

[Explanation of symbols]

1, 2 Split mold 10, 20 Split mold inner surface 11, 21 Split mold land surface 12, 22 Seal member P Foam molded product F (S) Insert member S Component part led out of mold

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI B29L 31:58 (58) Fields investigated (Int.Cl. ⁶ , DB name) B29C 39/10-39/44 B29C 33/00 -33/76 B29K 105: 04 B29K 105: 20 B29L 31:58

Claims (1)

(57) [Scope of request for utility model registration] 1. An insert member having a structural part led out of a mold from a land surface is assembled into a split mold, and a foam molded product is integrally formed with the insert member from a foamed resin filled in the split mold. In an integral foam molding die of an insert member used for foam molding, a half-divided receiving groove through which a component part of the insert member led out of the mold from the land surface is inserted, and a groove of the receiving groove. An elastic seal member provided with a plurality of ridges located in the groove width direction and spaced apart from near the edge of the inner surface of the mold is embedded and mounted in opposition to the land surface of each split mold. The integral foam molding die of the insert member.