JP2555834Y2 - Press forming equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press molding apparatus for producing a multilayer molded product by using a resin raw material of a different material by a press molding apparatus.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional press molding apparatus for press-molding a multilayer molded product having a resin core material and a skin material which is a resin different from the core material as an integral structure. There is something like that. That is, reference numeral 1 denotes a fixed plate, on which a core material molding cavity mold 2 and a skin molding cavity mold 3 are installed, and these cavity molds 2 and 3 are arranged at symmetrical positions in the diameter direction. Further, one cavity mold 2 is connected to a first resin injection machine 4, and the other cavity mold 3 is connected to a second resin injection machine 5. A movable plate 6 that moves up and down is provided on the cavity molds 2 and 3, and a rotary table 7 is supported on the lower surface of the movable plate 6 so as to be rotatable in the horizontal direction. On the lower surface of the table 7 and at the symmetric position in the diameter direction, the cavity molds 2 and 3 are provided.
The core molds 8, 8 'of the same shape corresponding to are mounted.
9 is a driving device for moving the movable platen 6 up and down,
Reference numeral 10 denotes an index for rotating the rotary table 7.

In order to form a multi-layer molded product as shown in FIG. 2 by such a press molding apparatus, first, the movable platen 6 is lowered, and the core dies 8 and 8 ′ are closed in the cavity dies 2 and 3. The core material molding resin is injected into the cavity mold 2 and the core mold 8 by a first resin injection machine 4 capable of injecting a resin for molding the core material 11 shown in FIG. 2, for example. The molded product (core material 11) is injection molded.

Next, the movable platen 6 is lifted to open the core dies 8 and 8 ′ from the cavity dies 2 and 3. The molded article 11 is raised together with the core mold 8.

Next, the rotary table 7 is set at 180. By rotating, the core mold 8 holding the primary molded product moves to the position of the core mold 8 '. Next, the movable platen 6 is lowered,
A core mold 8 for holding the primary molded product 11 and a cavity mold 3
And close the mold. After the mold is closed, a resin for molding the skin material 12 shown in FIG. 2 is injected from the second resin injection machine 5 to form a secondary molded product (skin material) 12 integrated with the primary molded product.
Is injection molded. At this time, since the cavity mold 2 and the core mold 8 'are both closed, if the resin is injected from the first resin injection machine 4 into the molds of both the molds 2 and 8', the secondary molding is performed in parallel. Thus, the primary molded product can be intermittently continuously produced.

[0006]

However, in such a press forming apparatus for continuous production using a rotary table, there is no problem if the molded product is small in size, but for example, it is used for mounting on a car, for example, in the case of a length. Is 1600mm
If a large molded product such as an instrument is to be molded by the same type of press molding device, the rotary radius of the rotary table that holds a plurality of these long dies in the diameter direction becomes enormous, and the press molding device becomes large. Of course, the pressing force for simultaneously pressing these multiple large materials becomes enormous, making molding difficult, and furthermore, a strong clamping device compared to the product dimensions Was required.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem. For example, a first core mold which is closed in a vertical direction with respect to one cavity mold, and a horizontal position. From the vertical position to the vertical position, and the second core mold closed in the horizontal position state. It is an object of the present invention to provide a press molding apparatus in which the pressing force effectively acts on the entire surface of the mold, and can be used as a relatively small press apparatus to produce a large product without any trouble.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in FIG.

Reference numeral 20 denotes a fixed plate, and 21 denotes a movable plate which is moved up and down by a press drive 22 such as a cylinder.
A cavity mold 23 is fixed on the fixed board 20, and a secondary core mold 24 is mounted on the lower surface of the movable board 21. Numeral 25 is a core-type support frame supported by the movable platen 21 via a rotary hinge 26 from a vertical position to a horizontal position within a range of 90 degrees. A primary core mold 27 corresponding to the cavity mold 23 is fixed to the lower surface. Reference numeral 28 denotes a pull chain for returning the primary core mold 27 from the vertical position to the horizontal position and back to the vertical position from the horizontal position. The pull chain 28 is pulled by the driving force of the motor 29. 30
Indicates a hook for holding the primary core mold 27 in a horizontal state.

The structure of the press forming apparatus of the present embodiment has been described above. Next, the operation will be described. In order to form a multilayer molded article by this press forming apparatus, first, a resin for forming the first layer is formed. Is injected into the cavity mold 23 from an extruder (not shown). Next, the primary core mold 27 held in the horizontal position shown by the solid line in FIG. 3 is lowered together with the secondary core mold 24 by the lowering operation of the movable platen 21 by the pulling force of the towing chain 28, and the primary core mold 27 is lowered. The resin supplied into the cavity mold 23 is pressurized by the cavity mold 23 and the cavity mold 23 to press-mold the first layer resin. The pressing operation of the resin by the primary core mold 27 acts by the pressing force of the secondary core mold 24. In other words, the rotating hinge 26 has the long hole 3
Since it is loosely fitted in the first part 1, the pressing force of the secondary core mold 24 effectively acts on the primary core mold 27, and the pressing by the primary core mold 27 is performed reliably.

After the first layer of resin is press-molded, the movable platen 21 is raised, the hook 30 is released, and the traction chain is loosened to move the primary core mold 27 to the position shown by the chain line. The second-layer molding resin is injected onto the first-layer molding in the cavity mold 23 by the illustrated resin extruder. Next, if the movable platen 21 is lowered and the resin of the cavity mold 23 is pressed by the secondary core mold 24, a two-layer resin molded product is press-molded.

Thereafter, when the movable platen 21 is raised, the molded product in the cavity mold can be taken out. By repeating this operation, a multilayer (two-layer) molded product can be produced intermittently.

Therefore, according to this press molding apparatus, the core mold 24 corresponding to the cavity mold 23 fixed to the fixed platen.
Is mounted on the lower surface of the movable platen 21 which moves up and down, and the cavity plate 23 and the core mold 24 are closed by a downward movement of the movable platen. The cavity mold 23 is rotated from a horizontal position directly below the core mold 24 to a vertical position outside the lower movement area of the core mold 24.
This is an apparatus for press-molding a multilayer molded product in combination with the core mold 24 and the other core mold 27 with respect to the cavity mold 23 by adding another core mold 27 corresponding to the above. It is possible to reduce the size of a press forming apparatus for press forming an article and significantly reduce the floor area for the equipment.

Further, since the molding apparatus of this embodiment is a single-piece molding, it is possible to produce a large-sized molded product, and it is also possible to obtain a molded product having a small thickness because the resin material is pushed and spread in a mold by a press. Since it is easy and low-pressure molding is possible, it is possible to obtain a high-quality multilayer product with little residual stress and little deformation.

In the above embodiment, the cavity mold 23 is used.
And the two types of core molds 24 and 27 may be the opposite molds, that is, the cavity mold 23 may be the core mold and the core molds 24 and 27 may be the cavity mold.

[0016]

As described above, according to the present invention, the core mold 24 corresponding to the cavity mold 23 fixed on the fixed platen 20 is
In a press forming apparatus which is mounted on the lower surface of a movable platen 21 which moves up and down, and which closes the cavity mold 23 and the core mold 24 by downward movement of the movable platen and press-molds the movable platen 21,
Is pivoted from a horizontal position directly below the core mold 24 to a vertical position outside the lower movement area of the core mold 24, and the hinge 26 is connected to another core mold 27 corresponding to the cavity mold 23. Driving means 28, 2 for rotating the other core mold 27 about the hinge 26 as an axis.
Since this is a press-forming apparatus provided with 9, the size of the press-forming apparatus for press-forming a multilayer molded product can be reduced, and the floor area for the equipment can be significantly reduced.

Further, since the molding apparatus of this embodiment is a single-piece molding, it is possible to manufacture a large-sized molded product, and it is also possible to obtain a molded product having a small thickness because the resin material is pushed and spread in a mold by a press. Since it is easy and low-pressure molding is possible, it is possible to obtain the effect of obtaining a high-quality multilayer product with little residual stress and little deformation.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional example.

FIG. 2 is an explanatory sectional view of a product to be molded.

FIG. 3 is a structural explanatory view of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Fixed board 21 ... Movable board 22 ... Press drive 23 ... Cavity type 24 ... Secondary core type 25 ... Core type support frame 26 ... Rotating hinge 27 ... Primary core type 28 ... Towing chain 29 ... Motor 30 ... Hook 31 ... Long hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A core mold (24) corresponding to a cavity mold (23) fixed on a fixed board (20) is mounted on the lower surface of a movable board (21) that moves up and down, and the movable board is moved down. In a press forming apparatus for closing and pressing a cavity mold (23) and a core mold (24), a hinge (26) provided on the movable plate (21) moves a horizontal position directly below the core mold (24). The other core mold (27) is rotated to a vertical position outside the lower movement area of the core mold (24) and corresponds to the cavity mold (23).
And a drive means (28, 29) for rotating the other core mold (27) about the hinge (26) as an axis.