JPH0639952Y2 - Frame-integrated foam molding mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a frame-integrated foam molding die used for manufacturing a cushion sheet with a frame for automobiles and the like.

<Prior Art> One of the molding methods for soft products is a method called integral foam molding. In this method, the metal or other material to be embedded in the foamed molded product, or the skin material to be adhered to the surface is set in advance in the mold, and the foaming raw material is injected into the mold. This is a method of foaming. According to this method, there is an advantage that a composite product in which a foam material and a dissimilar material are integrated can be efficiently manufactured, and almost all cushion sheets with frames for automobiles as shown in FIG. 3 are manufactured by this integral foam molding method. Is starting to appear.

In the cushion seat with a frame manufactured by the integral foam molding method, the frame 1 is in the form of being built in the rear cushion pad 2. However, the hook portion 1a provided on the frame 1 for mounting the cushion in the vehicle has a rear portion. It needs to be outside the cushion pad 2.

However, at the time of integral foam molding, as shown in FIG.
Since the foaming raw material 2a also penetrates into the concave portion 4 for accommodating the hook portion 1a provided in the rear cushion pad 2, it is difficult to prevent only the hook portion 1a of the frame 1 from being buried in the rear cushion pad 2.

Therefore, conventionally, after the integral foam molding, as shown in FIG. 5, the foam material (urethane) at the portion indicated by the chain double-dashed line C attached to the hook portion 1a is peeled off, or as shown in FIG. At the root of the hook 1a of the frame 1, attach a sealing material 7 made of foam separately, and the urethane raw material 2a is attached to the frame 1
I tried not to attach it to the hook part 1a.

<Problems to be solved by the invention> However, these methods for bringing the hook portion 1a out of the rear cushion pad 2 have to rely on manual work.
There was a problem that the work was quite troublesome. Moreover, the method of removing the foam material adhering to the hook part after molding cannot be taken off neatly, so the hook part does not function reliably, and extra effort is paid when installing the cushion seat inside the vehicle. It was On the other hand, in the method in which the seal material is separately attached to the base of the hook portion 1a before molding, the seal material causes a cost increase and may cause a seal failure.

The present invention has been made for the purpose of solving the above problems, and the problem to be solved is to prevent urethane from adhering to the hook portion reliably without the need for complicated work, and to make the function of the hook portion sufficient. It is an object of the present invention to provide a frame-integrated foam-molding die capable of producing a frame-integrated foam-molded article which can be exhibited in high productivity with high productivity.

<Means for Solving the Problems> A frame-integrated foam molding die of the present invention which can solve the above problems is provided with a recess for accommodating the hook portion of the frame in the upper mold, and the periphery of the opening of the recess. It is characterized in that a weir having a predetermined height is projected.

The weir projecting at the periphery of the opening of the recess is to prevent the inflow of the foaming raw material into the recess and the outflow of gas from the recess, and it is preferable that the weir is provided as high as possible without hindering it. The opening of the weir is preferably narrow.

In order to project the weir into the upper mold, it may be provided integrally with the mold at the time of molding, but by adhering the weir cylinder to the hole of the recess (so that the spaces communicate with each other), It may be fixed to the upper mold by screwing or the like.

The mold for foam molding for manufacturing molded products having hooks of various shapes and sizes has various recesses correspondingly, but the mold of the present invention has weirs in all the recesses. It does not need to be provided, and may be provided in the concave portion where the problematic foaming agent adheres.

<Operation> With the above configuration, a larger gas storage space surrounded by the recess and the weir is formed in the upper mold. This gas storage space has a shape that is closed at the top and opened at the bottom, and the foaming raw material tries to enter from below into this gas storage space during foam molding. At that time, the weir prevents the gas stored in the recess from evacuating. Therefore, the foaming raw material cannot rise up to the inside of the concave portion in which the hook portion of the frame is accommodated, and the foam material does not adhere to the hook portion.

<Embodiment> A molding die according to an embodiment of the present invention will be described below with reference to the drawings, but the gist of the present invention is not limited thereto.

FIG. 1 is a cross-sectional view of an essential part showing a use state of a frame-integral foam molding die of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.

This mold consists of an upper mold 3 and a lower mold (not shown),
Isocyanate, polyol, foaming agent, foam stabilizer in the lower mold,
While injecting a urethane raw material composed of a cross-linking agent, a catalyst, etc., the frame 1 is attached to the upper mold 3, and then the mold is closed and left for a certain period of time so that the frame 1 as shown in FIG.
It is possible to manufacture a cushion seat with a frame in which the hook portion 1a of the frame is exposed to the outside of the rear cushion pad 2. FIGS. 1 and 2 show the state of molding (before demolding) in the vicinity B of the hook portion 1a.

The upper mold 3 of the mold is provided with a recess 4 for accommodating the hook 1a of the frame 1, and a weir 3a (protruding part) is provided so as to surround the peripheral edge of the opening. The frame 1 is fitted into the upper mold by utilizing its own elasticity.

When performing integral foam molding with this mold, the urethane raw material expands and expands along with the reaction, and tries to enter the concave portion 4 of the upper mold 3 in which the hook portion 1a of the frame 1 is accommodated. However, since the weir 3a is projectingly provided around the opening of the recess 4, the gas storage space 5 is large, and the gas in the recess 4 cannot escape because of the weir 3a. Cannot go up to the hook portion 1a. Therefore, a cushion sheet with a frame in which the hook portion 1a is not covered with urethane can be obtained.

When molding was repeated while changing the shape and size of the weir, it was confirmed that the higher the height of the weir and the smaller the area of the opening of the weir, the more effective the prevention of urethane adhesion is.

<Effects of the Invention> As is clear from the above description, in the frame-integrated foam molding die of the present invention, a large amount of recesses are formed in the recess by the weir projecting at the periphery of the opening of the recess for housing the hook portion of the frame. Since the gas that has been stored in the hose prevents the foaming raw material from flowing into the recess, a frame-integrated foamed molded product can be obtained that does not cover the hook portion with the foaming material and functions reliably and can be easily attached to a predetermined place. .

Further, in the hook portion, the troublesome work of peeling off the foamed material after molding or attaching the sealing material before molding becomes unnecessary, and the productivity can be improved and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part showing a use state of a frame-integrated foam molding die according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a frame viewed from the back side. FIG. 4 is a perspective view showing the attached cushion sheet, FIG. 4 is a cross-sectional view showing a molding state by a conventional mold, FIG. 5 is an explanatory view of a conventional method of letting out a hook portion, and FIG. 6 is an explanation of another method. It is a figure. In the figure: 1 ... frame, 1a ... hook part 2 ... rear cushion pad 2a ... urethane material (foaming material) 3 ... upper mold, 3a ... weir, 4 ... recess

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Claims (1)

[Scope of utility model registration request] 1. An integral frame structure, wherein an upper die is provided with a recess for accommodating a hook portion of the frame, and a weir having a predetermined height is projected from a peripheral edge of an opening of the recess. Mold for foam molding.