JP3385334B2 - Molding equipment for molding - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die device for molding a molded article such as a lid (cover) of an automobile glove box and an instrument panel, which is covered with a skin.

[0002]

2. Description of the Related Art Conventionally, as a mold device of this type, those disclosed in, for example, Japanese Patent Laid-Open No. 4-241920 and FIGS. 11 and 12 are known.

The mold device of the above publication has a skin covering the entire side surface of the base material, and when a molded product having an undercut portion on the side of the skin is molded, the holding device is actuated in advance, If the split mold is clamped or stopped in the space between the upper mold and the lower mold during mold clamping, and the skin is set on the split mold from above in this state, the upper mold is moved while moving the split mold in the vertical direction. Since the base is molded by clamping the lower mold and the lower mold, it is not necessary to bend the outer skin and set it on the split mold from below the split mold, so the skin can be set easily and accurately. There is an effect that can be done.

Further, the slide type mold apparatus shown in FIG. 11 has a plurality of movable dies (slides) b which slide in the front-back and left-right directions in the first die a.
Set the skin c on the first mold a in the state of retreating, and then while moving the movable mold b forward, the first mold a and the second mold b are clamped or stopped in the space, and A molded product having a surface covered with a skin c is formed by injecting a molten resin into a cavity f from a valve gate e provided in a die d or by closing the die after injection.

Further, the pressing piece type die apparatus shown in FIG. 12 is provided with a movable die (pressing piece) h which is urged upward by a spring g on the side of the second die d and is movable up and down. With the skin c held between the mold h and the first mold a, the first mold a
And the second mold d are clamped or stopped in the space, and the second mold d
The resin is injected into the cavity f from the valve gate e provided in or is clamped after the injection to mold a molded product whose surface is covered with the skin c.

[0006]

However, as in the above publication, after the outer skin is set in the vertically movable split mold, the upper and lower molds are clamped while moving the split mold in the vertical direction. There is a problem that a molded product in which the end portion of the base material is rolled up by the skin cannot be easily molded, and the shape of the molded product that can be molded is limited.

Further, as in the mold device shown in FIG. 11, in the case where the movable mold b which is slidable in the front-rear and left-right directions is slid so that the end portion of the base material being molded is wound by the skin c, the skin c Since it is difficult to control the winding timing of the product appropriately, there are problems such as variation in the quality of the molded product and a high frequency of defective products.

Further, when the skin c is set between the first mold a and the movable mold h as in the mold device shown in FIG. 12, a part of the skin c is partially moved between the first mold a and the movable mold h. It may be bitten between the two, and as a result, defective products are likely to occur, and the first mold a and the movable mold h are brought into close contact with each other with the skin c set on the movable mold h. Since the skin c is held between the movable dies h, the gap i between the wound portion c ′ of the skin c set in the movable die h and the skin c becomes small, and the molten resin does not easily flow into the gap i. There are problems such as lack of thickness occurring in this portion, and molten resin entering under the winding portion c ′, and the resin squeezing out on the surface of the molded product that has been molded.

The present invention has been made to solve the above-mentioned conventional problems. By combining the slide system and the pressing piece system, the skin can be easily set and the winding timing of the skin can be easily adjusted. An object of the present invention is to provide a molding die device so that a molded product of good quality can be stably obtained.

[0010]

In order to achieve the above object, the invention according to claim 1 is provided with a fixed first mold and a movable first contacting and separating direction with respect to the first mold, and A second mold which can be clamped to the first mold by mold clamping means, and a plurality of slides which are provided on the first mold side and which can be moved back and forth toward the center of the cavity by slide drive means.
The slide is supported by a slide or a second mold so as to be movable in a direction orthogonal to the contacting / separating direction of the slide, and when a molded product is molded, it comes into contact with a wound portion of a skin set in advance in a cavity. , A pressing piece for winding the winding portion.

With the above construction, the skin can be set in the cavity with the slide retracted, so that the skin can be set easily and surely, and the molten resin injected into the cavity is covered with the skin. Since the inflow is started between the first and the second positions and the winding part is wound, the molten resin can be flowed into every corner between the skin and the winding part.

In order to achieve the above object, the invention according to claim 2 is the gap between the slide and the pressing piece, or the pressing piece and the second piece.
The timing adjusting means for adjusting the winding timing of the skin winding portion by adjusting the gap between the molds is provided.

With the above structure, the winding timing of the skin winding portion can be adjusted according to the size and shape of the molded product, the winding amount of the winding portion, and the like, so that the end portion of the winding portion is turned up to the outside of the winding portion. Since the molten resin does not enter and only the gap needs to be adjusted, the winding timing can be easily adjusted in a short time.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a molded article 1 such as a lid which is provided in a glove box of an automobile so as to be openable and closable. A base material 1a made of a resin has a soft surface, for example, cloth.
It is covered with a skin 1b formed by laminating EF.

FIG. 2 shows a mold apparatus for molding the above-mentioned molded article 1. The first mold 2, the slide 3 provided on the lower surface of the first mold 2, and the slide 3 provided on the lower surface of the slide 3. The pressing die 4 and the second die 5 are arranged so that the first die 2 and the second die 5 can be clamped by a die clamping means (not shown) via the slide 3 and the pressing die 4. .

The first mold 2 is fixed horizontally or vertically to an injection molding machine (not shown), and on the surface facing the second mold 5, for example, a slide 3 divided into four is directed toward the center of the cavity 7. It is mounted so that it can move back and forth.

To the back surface of these slides 3, slide drive means 6 fixed to the first mold 2 for each slide 3 is connected.

The slide driving means 6 is composed of, for example, a hydraulic cylinder, and the tip end of a piston rod 6b protruding from the cylinder 6a is fixed to the back surface of each slide 3, and each slide 3 is driven by the slide driving means 6. By advancing and bringing the divided surfaces into close contact with each other, a cavity 7 for molding the molded product 1 is formed in each slide 3.

From each slide 3 described above, the second mold 5 is
A guide rod 3a is provided so as to project toward, and a pressing piece 4 is slidably supported on these guide rods 3a in a direction orthogonal to the contact / separation direction of the slide 3.

Between the slide 3 and the pressing piece 4, an urging means 8 composed of a coil spring fitted in the guide rod 3a is interposed, and the pressing piece 4 is urged in a direction away from the slide 3. At the same time, the tip end of the guide rod 3a is provided with timing adjusting means 9 for adjusting the winding timing of the skin 1a by adjusting the gap D between the slide 3 and the pressing piece 4.

The timing adjusting means 9 is composed of, for example, a bolt 9a screwed to the tip of the guide rod 3a. By tightening and loosening the bolt 9a, the gap D between the slide 3 and the pressing piece 4 is increased. Can be adjusted freely.

On the other hand, in the second die 5, a land portion 5b protruding toward the first die 2 is formed in the central portion of the flat plate portion 5a, and the tip end surface of the land portion 5b and the first die are formed. A cavity 7 sealed between the mold 2 and the slide 3 can be formed, and the side surface of the land portion 5b has
When the slide 3 is moved to the forward end, the inner surface of the pressing piece 4 is slidably adhered.

Further, a valve gate 5c for injecting the molten resin into the cavity 7 is formed substantially at the center of the land 5b.

Next, a method of molding the molded product 1 using the mold apparatus having the above-described structure will be described in detail with reference to FIGS. 2 to 7.

First, each slide is moved back to the position shown in FIG. 2 by the slide driving means 6, and then the skin 1b which has been cut into a predetermined shape is shaped by vacuum forming or the like and the peripheral portion is wound inward to form a cavity. Set in 7.

Next, the second mold 5 is moved forward in the direction of the first mold 2 while the slide driving means 6 is moving the slides 3 forward as shown in FIG.
Of the second die 5 is brought into contact with the side surface of the land 5b of the second die 5 at the same time.

In this state, the second mold 5 is further advanced to reach the position shown in FIG.
Then, the molten resin 10 is injected into the cavity 7.

At this time, the clearance between the slide 3 and the pressing piece 4 is still maintained at the initially adjusted clearance D.

After that, when the second die 5 further advances and reaches the position shown in FIG. 5, the winding portion 1c of the skin 1b comes into contact with the corner of the pressing piece 4 and the molten resin injected into the cavity 7 is reached. 10 reaches near the winding part 1c of the skin 1b.

When the second mold 5 is further advanced from this state, the flat plate 5a of the second mold 5 presses the pressing piece 4 as shown in FIG. 6, so that the biasing means 8 is compressed. The gap D between the slide 3 and the pressing piece 4 is gradually reduced, and the winding portion 1c of the skin 1b is pressed against the upper surface of the land 5b of the second mold 5 along with this, and the gap with the skin 1b is formed. Is narrowed, but at this time, the skin 1b and the winding portion 1c
Since the molten resin has already flowed in between, the winding portion 1c does not turn up and the molten resin does not enter between the winding portion 1c and the pressing piece 4.

After that, the second die 5 is further advanced to the position shown in FIG.
When the mold is clamped at the final mold clamping position shown in, the slide 3 and the pressing piece 4 come into close contact with each other, and the cavity 7 has a final shape. The molded product 1 is molded by the cavity 7, and the molded product 1 is molded. When completed, the second mold 5 is released to start retreating, and when the mold opening of the second mold 5 is completed, the molded product 1 that has been molded is taken out from the cavity 7.

The molded product 1 molded as described above is
The surface of the substrate 1a is covered with the skin 1b, and the substrate 1
The peripheral part of a is wound by the winding part 1c of the skin 1b, the peripheral part of the molded product 1 has no flesh, and the molded product 1 of good quality in which the resin does not spill out to the outside of the wound part 1c. Will be obtained.

On the other hand, the winding timing of the skin 1b varies depending on the size and shape of the molded product 1, but the mold apparatus of the present invention allows the winding timing to be easily adjusted.

The skin 1b is wound in at a timing between the slide 3 and the pressing piece 4 because the winding is started when the pressing piece 4 is brought into contact with the tip of the winding part 1c of the skin 1b set in the cavity 7. It is performed by adjusting the gap D of.

For the adjustment, the bolt 9a of the timing adjusting means 9 screwed onto the tip of the guide rod 3a may be tightened or loosened to adjust the gap D, and the smaller the gap D, the faster the winding timing. Since the entrainment timing will be delayed if the value is increased, the gap D is adjusted to the optimum value in accordance with the shape and size of the molded product 1 and the amount of the skin 1b entrained. It is possible to stably obtain a molded product 1 of good quality with no protrusion of meat or resin.

In the above embodiment, the pressing piece 4 is the first
Although it is provided on the mold 2 side, it may be provided on the second mold 5 side as shown in FIG. In this case as well, the winding timing of the winding portion 1c of the skin 1b can be adjusted as in the above embodiment.

That is, by adjusting the gap D between the pressing piece 4 provided on the second die 5 side and the flat plate portion 5a of the second die 5, the shape and size of the molded article 1 and the skin 1b are adjusted. Optimal winding timing can be obtained according to the amount of winding.

9 and 10 show the molding process when the pressing piece 4 is provided on the second mold 5 side.

[0040]

As described in detail above, according to the present invention, a plurality of slides which can freely move back and forth in the center direction of the cavity between the first mold and the second mold, and are orthogonal to the contact and separation directions of these slides. It is movably supported in the direction, and when forming a molded product, it is composed of a pressing piece that comes into contact with the winding part of the skin set in the cavity in advance and winds the winding part. Since the skin can be set in the cavity in this state, the skin can be set easily and securely, and the molten resin injected into the cavity starts to flow between the skin and the winding part, Since I tried to involve the part,
The molten resin can flow into every corner between the skin and the rolled-in portion.

As a result, a defect such as a lack of wall is not generated in the peripheral portion of the molded product, and the molded product of good quality having the surface covered with the skin and the wound portion of the skin in the peripheral region is stable. Will be obtained.

Further, since the timing adjusting means is provided for adjusting the winding timing of the skin winding portion by adjusting the gap between the slide and the pressing piece or the gap between the pressing piece and the second mold, the skin winding is included. Since the winding timing of the part can be adjusted according to the size and shape of the molded product, the amount of winding of the winding part, etc., the end of the winding part will not turn up and the molten resin will not enter the outside of the winding part. Since it is only necessary to adjust the gap, it is possible to easily adjust the winding timing in a short time, and workability is greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a molded product molded by a molding die device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a molding die device according to an embodiment of the present invention.

FIG. 3 is a process drawing showing a process of molding a molded product by the molding die device according to the embodiment of the present invention.

FIG. 4 is a process drawing showing a process of molding a molded product by the molding die device according to the embodiment of the present invention.

FIG. 5 is a process drawing showing a process of molding a molded product by the molding die device according to the embodiment of the present invention.

FIG. 6 is a process drawing showing a process of molding a molded product by the molding die device according to the embodiment of the present invention.

FIG. 7 is a process drawing showing a process of molding a molded product by the molding die device according to the embodiment of the present invention.

FIG. 8 is a sectional view showing a molding die device according to another embodiment of the present invention.

FIG. 9 is a process drawing showing a process of molding a molded product by a molding die device according to another embodiment of the present invention.

FIG. 10 is a process drawing showing a process of molding a molded product by a molding die device according to another embodiment of the present invention.

FIG. 11 is an explanatory view showing a conventional molding die device.

FIG. 12 is an explanatory view showing a conventional molding die device.

[Explanation of symbols]

1 molded product 1a Base material 1b Epidermis 1c Roll-in section 2 First mold 3 slides 3a guide rod 4 pressing pieces 5 Second mold 5a Flat plate part 5b Land section 5c valve gate 6 Slide drive means 6a cylinder 6b Piston rod 7 cavities 8 urging means 9 Timing adjustment means 9a bolt D gap

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-169485 (JP, A) JP-A-4-241920 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 45 / 14,45 / 26,45 / 56 B29C 33 / 12,33 / 14

Claims (2)

(57) [Claims] 1. A fixed first mold, and a second mold which is provided so as to be movable in a contacting and separating direction with respect to the first mold and which can be clamped to the first mold by a mold clamping means. And a slide provided on the side of the first mold and movable back and forth in the center direction of the cavity by a slide driving means, and a slide or a second mold so as to be movable in a direction orthogonal to the contact and separation direction of the slide. A molding die device, comprising: a pressing piece supported by a mold and abutting against a wound portion of a skin which is set in a cavity in advance when the molded product is molded, and a pressing piece for winding the wound portion. 2. The timing adjusting means for adjusting the winding timing of the skin winding portion by adjusting the gap between the slide and the pressing piece or the gap between the pressing piece and the second mold. The molding die device described.