JPH0246136B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a mold forming method.

[Prior art]

Conventionally, an automobile seat has been composed of a seat back pad 1 and a seat cushion pad 2 made of urethane foam, as shown in the exploded perspective view of FIG. A metal reinforcing member 4 to which brackets 3a and 3b are fixed is inserted and integrally molded, and reclining adjuster arms 4a and 4b are attached upright to the seat cushion pad 2. . Then, when assembling the seat as a car seat, the brackets 3a, 3b of the seat back pad 1 and the arms 4a, 4b of the seat cushion pad 2 are joined, and the joints are fixed with fixing members 5a, such as bolts and nuts. 5b.

The seat back pad 1 is molded by a molding method as shown in the schematic cross-sectional view of FIG. That is, the molding space 51a is formed on the upper surface of the lower mold 51 and is open upward.
After setting the reinforcing member 54 made of a metal material to which the bracket 52 and nut 53 are fixed using a set pin (not shown) or the like, the upper mold 55 is closed to the lower mold 51 to seal the molding space 51a. At this time, a protrusion 55a formed on the upper mold 55 is brought into contact with the outside of the bracket 52 to be exposed. Thereafter, a urethane raw material consisting of polyol, isocyanate, crosslinking agent, blowing agent, catalyst, etc. is injected and filled into the molding space 51a and foamed, so that the urethane W and the molding space 54 are integrally molded.

However, in such a molding method, when setting the reinforcing member 54 in the molding space 51a, if the setting position deviates even slightly, the part of the bracket 52 to be exposed and the protrusion 55a of the upper mold 55 may A gap A occurs between them. For this reason, liquid urethane raw material infiltrates into the gap A during molding, and not only does the portion of the bracket 52 that is to be exposed be covered with foamed urethane, but also the highly adhesive foamed urethane coated when assembled as a sheet. There is a problem that needs to be removed.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to attach a magnetic insert to the part of the reinforcing member where it is desired to be exposed, and then inject a molding material and integrally mold the reinforcing member. Therefore, it is an object of the present invention to provide a molding method that can prevent urethane foam from covering a portion of a reinforcing member that is desired to be exposed.

[Structure of the invention]

In order to achieve the above object, the structure of the mold forming method according to the present invention consists of an upper mold and a lower mold, and the molding space formed when both molds are closed is reinforced with a metal material. A molding method in which a member is set and integrally molded with a molding material, in which an insert made of a magnetic material is attracted to a portion of the reinforcing member that is desired to be exposed, and then the molding material is injected and integrally molded. This is what I did.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 3 is a schematic sectional view for explaining the molding method according to the present invention, and FIG. 4 is a schematic sectional view for explaining the release of the molded product obtained by the molding method of the present invention. It is.

In FIGS. 3 and 4, 6 is an upper mold, and a protrusion 6a extending downward is formed in the center of the lower surface of the upper mold 6, and a flat contact surface is formed around the protrusion 6a. 6b is formed. In addition, the upper mold 6
A lower mold 7 is disposed below the upper mold 7, and a concave molding surface 7a that opens upward is formed in the center of the upper surface of the lower mold 7. A contact surface 7b is formed. When the upper mold 6 and the lower mold 7 are closed together, a molding space 8 is formed between the molds 6 and 7.

When molding the seat back pad W, a bracket 9 and a nut 10 made of a metal material are fixed in a molding space 8 formed by closing the upper mold 6 to the lower mold 7. Reinforcement member 1
After setting, the insert 12 made of a magnetic material is attracted to the outside of the bracket 9 to be exposed. At that time, a release agent is applied to the surface of the insert 12 in advance. The size of the insert 12 is such that it covers the outside of the bracket 9, and its upper end surface is flush with the surface of the seat back pad W to be molded. It is adapted to cover a through hole (not shown) in the bracket 9 which leads to a hole (not shown).

Next, the upper mold 6 is closed to the lower mold 7 to seal the molding space 8, and the molding space 8 is filled with urethane containing polyol, isocyanate, crosslinking agent, blowing agent, catalyst, etc. in a predetermined ratio. Inject and fill raw materials. Then, the urethane raw material is foamed to form a seat back pad W in which the urethane Wa and the reinforcing member 11 are integrated.

Thereafter, the upper mold 6 is released from the lower mold 7, and the molded seat back pad W portion is opened. Then, the seat back pad W is taken out from the lower mold 7, and the insert 12 adsorbed to the outside of the bracket 9 is removed. As a result, bracket 9
A seat back pad W without foamed urethane adhered to the outside is obtained.

In this embodiment, the mold release agent was applied to the surface of the insert 12. However, in the present invention, the surface of the insert 12 is coated with a synthetic resin that can be easily peeled off from urethane such as tetrafluoroethylene. can also be coated. Further, the magnet may be embedded in the above-mentioned synthetic resin or the like.

[Effect of idea]

As explained above, in the molding method according to the present invention, after adhering the insert made of a magnetic material to the part of the reinforcing member that is desired to be exposed, the molding material is injected and the reinforcing member is integrally molded. Since the part of the reinforcing member that is desired to be exposed can be covered by the insert, it is possible to prevent the urethane foam from covering the part of the reinforcing member that is desired to be exposed during molding.

Furthermore, in the present invention, by preventing the urethane foam from covering the parts of the reinforcing member that are desired to be exposed, there is no need to remove the highly adhesive foam urethane when assembling the finished product, making assembly work easier. It has the effect of improving the

Furthermore, in the present invention, the part of the reinforcing member that is desired to be exposed is covered by the insert made of magnetic material during molding, so that even if the setting of the reinforcing member in the molding space is deviated, a gap will not occur. This has the effect of significantly improving workability during mold forming.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an automobile seat viewed from the rear side, and FIG. 2 is a schematic cross-sectional view for explaining a conventional molding method. FIG. 3 is a schematic cross-sectional view for explaining the mold forming method according to the present invention. FIG. 4 is a schematic cross-sectional view for explaining the release of a molded product obtained by the molding method of the present invention. 6... Upper mold, 6a... Protrusion, 6b... Contact surface,
7... Lower mold, 7a... Molding surface, 7b... Contact surface, 8
... Molding space portion, 9... Bracket, 10... Nut, 11... Reinforcing member, 12... Insert.

Claims (1)

[Claims] 1. A mold forming method consisting of an upper mold and a lower mold, in which a reinforcing member made of a metal material is set in a molding space formed when both molds are closed, and is integrally molded with the molding material, the method comprising: A molding method characterized by adhering an insert made of a magnetic material to a portion of a reinforcing member to be exposed, and then injecting a molding material to perform integral molding.