JPH0544101Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention has an undercut part in which the skin and a foam layer made of polyurethane or the like are integrally molded, and a part of the skin is folded back to form a bag shape. The present invention relates to a molding device for skin integral foam molding, which is applied when molding a molded article such as a vehicle seat upholstery material.

(Prior Art) Conventionally, when molding a vehicle seat upholstery material having an undercut portion, for example, as shown in FIG.
and a rotating mold b2 which is pivotally attached to one end of the female mold main body b1 so as to be rotatable in the inward and outward directions, and the undercut portion is formed by the rotational movement of the rotating mold b2. As shown in FIG. 8, a guide hole d is provided horizontally at one end of the male mold a, facing the recessed part b3 of the female mold b, so that the slide mold e can be horizontally slid into the guide hole d. The undercut portion was formed by inserting and removing the slide mold e into and out of the recessed portion b3.

(Problem to be solved by the invention) When molding an integrally molded body of a skin h and a polyurethane foam layer using the mold shown in FIG.
Since the undercut cannot be set in close contact with the mold surface of the rotary mold b2, there is a problem that the undercut portion is molded into an irregular shape. There was a problem in that during foam molding, the foam invaded the sliding surface between the guide hole d and the slide mold e, making the slide mold e unable to slide.

The object of the present invention is to solve the problems encountered when molding a molded article such as a vehicle seat upholstery having an undercut portion, and to form the undercut portion accurately and stably.

(Means for Solving the Problems) The molding device of the present invention has a part of the skin in a bag-like shape near one end of a molded product in which a skin and a foam layer laminated on the back side of the skin are integrally molded. A molding device comprising a female mold having a concave portion recessed in the lateral direction for molding an undercut portion formed by folding back, and a male mold disposed opposite to the female mold,
The male mold is divided into a male mold main body placed on the female mold, and a core mold inserted into the recess so as to be able to exit out of the recess, and the core mold is a holding means for holding the core mold in a vertically movable manner but not horizontally movable; a vertical positioning means for defining an upper moving end position of the core mold; and a holding means for holding the core mold at the upper moving end position. It has a configuration with

(Function) With the male mold main body retracted from above the female mold and the core mold formed by dividing the male mold retracted from the recessed part of the female mold, the outer skin is removed from the main molding surface and the recessed part of the female mold. The male mold body is placed in close contact with the undercut molding surface of the mold, and then the male mold main body is placed on the female mold with the core mold projecting into the recessed part. and,
A holding means that allows the core mold to move vertically but cannot move horizontally; a vertical positioning means that defines the upper end position of the core mold; and a holding means that holds the core mold at the upper end position. Accordingly, the core mold is positioned and set within the recess.

(Effects of the invention) Since the present invention is configured as described above, when setting the skin in the female mold, it is possible to bring the undercut molded part of the skin into close contact with the undercut molding surface of the recessed part over the entire surface. Moreover, the core mold can be accurately positioned and set within the recess. Therefore, the undercut portion having an appropriate shape can be stably molded, and the molded shape of the entire molded article can be constantly optimized.

(Example) Next, an example of the present invention will be described with reference to the drawings.

As shown in FIG. 2, a skin H and a polyurethane foam layer U laminated on the back side of the skin H are integrally molded, and a part of the skin H has an undercut portion C folded back into a bag shape. In a molding device for skin-integrated foam molding that is applied to mold a molded article S, a main molding surface 1a is formed in a concave shape on the upper surface near the left part of the female mold 1, and a main molding surface 1a is formed in a concave shape near the right end of the female mold 1 in the figure. A protrusion 1b is formed that protrudes upward, and an undercut portion C of the molded body S is formed on a joint end surface 2 that is perpendicular to the inner end of the protrusion 1b.
In order to form the recessed part 3, the recessed part 3, which is open inward and has an approximately inverted U-shape in longitudinal section, is recessed in the horizontal direction.
An undercut molding surface 3a connected to the main molding surface 1a is formed on the inner wall surface. Further, a pair of positioning grooves 4, 4 each having a substantially U-shaped cross section are provided in the joint end surface 2 in parallel in the vertical direction.

A male mold 5 placed opposite the female mold 1 in order to mold the molded body S in cooperation with the female mold 1 is placed so as to be retractable on the female mold 1 on the left side of the joint end surface 2 in the figure. It is divided into a male mold main body 6 having a molding surface 6a protruding from its lower surface, and a core mold 7 which is inserted into the recess 3 of the female mold 1 so as to be able to move out of the recess 3.
When the male mold main body 6 is set on the female mold 1, the inner end surface 6b of the male mold main body 6 is brought into close contact with the joining end surface 2 of the female mold 1.

A polyurethane stock solution is injected into the male mold body 6 into the gap between its molding surface 6a and the main molding surface 1a of the female mold 1, and into the gap between the undercut molding surface 3a of the concave portion 3 and the core mold 7. An injection flow path 8 connected to the machine 16 is provided through the inner end surface 6b of the male body 6, and an engaging portion 9 having an inverted L-shaped longitudinal section and opening downwardly and outwardly is recessed at the lower end of the inner end surface 6b of the male body 6. has been done. A positioning surface 10 is horizontally formed on the upper wall surface of this engaging portion 9, and a single positioning surface 10 is formed on this positioning surface 10.
A pair of magnets 11, 11 are buried, and both magnets 11
The lower surfaces of are respectively aligned with the positioning surface 10.

On the upper surface of the inner end of the core mold 7, a pair of operating rods 12, 12 for manual operation, which are removably inserted into both the positioning grooves 4, are integrated and vertically arranged side by side. . The core mold 7 is inserted into the concave portion 3, both operating rods 12 are fitted into both positioning grooves 4, and the male mold main body 6 is placed on the female mold 1 and its inner end surface 6b is inserted.
When the core 7 is in close contact with the joint end surface 2 of the female mold 1, the inner end surface 7a of the core mold 7 is in close contact with the inner end surface 6b of the male mold main body 6, and both positioning grooves 4 are in close contact with the inner end surface 6b of the male mold main body 6.
The core mold 7 is held in a vertically movable manner but not horizontally movable relative to the protruding portion 1b of the female mold 1 and the male mold main body 6, and is positioned in the horizontal direction. In addition, when the male mold main body 6 is retracted from above the female mold 1, both positioning grooves 4 are opened, both operating rods 12 are removed from both positioning grooves 4, and the core mold 7 is withdrawn from the inside of the recessed part 3. can be done.

A male body 6 is attached to the lower end of the inner end surface 7a of the core mold 7.
A hanging part 1 having an inverted L shape in vertical section engages with an engaging part 9 of
3 is provided protrudingly, and the upper surface of this hooking part 13 is connected to the engaging part 9.
The upper moving end position of the core mold 7 is defined by contacting the positioning surface 10 of the core mold 7, and the core mold 7 is positioned in the vertical direction. Under the upper surface of the hooking part 13, there is a magnet 1 that is removably attached to both magnets 11 of the positioning surface 10.
A pair of magnetic metal pieces 14 and 14 are embedded, and the top surfaces of both magnetic metal pieces 14 are aligned with the top surface of the hook 13 . When the core mold 7 is pulled up and the upper surface of the hook part 13 comes into contact with the positioning surface 10, the core mold 7
is held at the upper moving end position by the magnetic force between both magnets 11 and both magnetic metal pieces 14.

Next, a method of molding the molded body S using the above-described molding apparatus will be explained.

First, as shown in FIG. 4A and FIG. 6A, the male mold body 6 is retracted from above the female mold 1, and the core mold 7 is removed.
In the state in which the mold is withdrawn from the recessed part 3, the skin H is set in the female mold 1 by closely contacting the main molding surface 1a of the female mold 1 and the undercut molding surface 3a of the recessed part 3.

Next, in this state, as shown in FIGS. 4B and 6B, the core mold 7 is inserted into the recess 3 and held at the lower moving end, and both operating rods of the core mold 7 are 12 into both positioning grooves 4 respectively.

Next, as shown in FIG. 6C, the male die main body 6 is set on the female die 1 so that the inner end surface 6b of the male die main body 6 is brought into close contact with the joint end surface 2 of the female piece 1, and then as shown in FIG. ,
As shown in FIG. 6D, the core mold 7 is pulled up by both operating rods 12 until the hooking part 13 engages with the engagement recess 9 and abuts against the positioning surface 10, and both magnets 11 and both magnetic metals are removed. The core mold 7 is held in the upper moving end position by the magnetic force with the piece 14, and the core mold 7 is positioned in the horizontal and vertical directions and set in the recess 3.

In this state, the polyurethane stock solution discharged from the injection machine 16 connected to the injection channel 8 of the male mold main body 6 is injected into the gap between the female mold 1 and the male mold 5 through the injection channel 8 to form foam. After the specified time has passed,
When the male mold body 6 is retracted from above the female mold 1 and the core mold 7 is taken out and demolded, a molded body S shown in FIG. 2 can be molded.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, a part of the skin H is folded back into a bag shape near one end of the molded body S in which the skin H and the foam layer 11 laminated on the back surface of the skin H are integrally molded. a female mold 1 having a concave portion 3 recessed in the lateral direction for molding an undercut portion C;
In a molding device equipped with a male mold 5 disposed opposite to the female mold 1, the male mold 5 is placed on the male mold main body 6 placed on the female mold 1, and the recessed part 3 is placed inside the recessed part 3. 3, and a core mold 7 that can be protruded so as to be retractable to the outside.In order to hold the core mold 7 vertically movable but not horizontally movable, there is a pair of molds on the joint end surface 2 of the female mold 1. The positioning grooves 4 are recessed along the vertical direction, and a pair of operating rods 12 are arranged side by side on the core mold 7 to be inserted into both the positioning grooves 4, and the inner end surface 6b of the male mold main body 6
A core mold 7 is provided on the upper wall surface of the engaging portion 9 recessed at the lower end.
In order to form a positioning surface 10 for defining the upper moving end position of the core mold 7 by bringing the protruding hooking part 13 into contact with it, and further holding the core mold 7 at the upper moving end position, A magnet 11 is embedded on the positioning surface 10, and a magnetic metal piece 14 that magnetically attaches to the magnet 11 is embedded below the upper surface of the hook portion 13.

For this reason, when the skin H is set in the female mold 1, the undercut molding portion of the skin H can be pressed against the undercut molding surface 3a of the recess 3 in a tight contact state over the entire surface, and the core mold 7 can be accurately positioned and set within the recess 3, so that an undercut portion having an appropriate and accurate shape can be stably molded and the molded shape of the entire molded body S can be steadily optimized.

Furthermore, the mechanism for positioning and setting the core mold 7 within the recess 3 can be simplified.

Note that the core mold 7 may be urged upward by a spring to hold the core mold 7 at the upper moving end position.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is a longitudinal sectional view of a molding device, Figure 2 is a longitudinal sectional view of a molded article, and Figure 3 is a vertical sectional view of the molded product. Figures 4A, B, and C are longitudinal sectional views sequentially showing the molding process of the molded body, Figure 5 is an enlarged perspective view of the main parts, and Figures 6A, B, C, and D are A broken perspective view showing the positioning operation of the core mold in order, and FIGS. 7 and 8 are longitudinal cross-sectional views showing a conventional mold, respectively. DESCRIPTION OF SYMBOLS 1... Female mold, 3... Recessed part, 4... Positioning groove, 5... Male mold, 6... Male mold body, 7... Core mold, 10... Positioning surface, 11... Magnet, 12 …
...Operation rod, 13...Latching portion, S...Molded object.

Claims (1)

[Scope of utility model registration request] a female mold having a recessed portion recessed laterally in order to form an undercut portion formed by folding back a part of the skin into a bag shape near one end of a molded body formed integrally with a skin and a foam layer laminated on the back surface of the skin, and a male mold opposed to the female mold, the male mold being divided into a male mold body placed on the female mold and a core mold which is inserted into the recessed portion so as to be able to move out of the recessed portion, and the molding device for integral skin foam molding is characterized in that the molding device is provided with: a holding means for holding the core mold so as to be movable up and down but not horizontally; a vertical positioning means for determining the upper limit position of the upper movement of the core mold; and a holding means for holding the core mold in the upper limit position of the upper movement of the core mold.