JPH0760776A - Compression mold - Google Patents

Abstract

PURPOSE:To constitute a mold so that at the time of molding of a compression- molded product with a skin material, creases are prevented from being generated by inserting smoothly a skin material into an undercut part of the mold and a thick part is not formed in an obtained product. CONSTITUTION:A projected mold 30, intermediate mold 40 and recessed mold 24 are provided and in accordance with clamping between the projected mold and recessed mold, a slide core 44 is allowed to abut against a core part 34 of the projected mold at a part where the skin material 50 enters a space among those, the recessed mold is allowed to abut against the intermediate mold, a closed space into which resin is filled is formed, the recessed mold and intermediate mold are moved in a body toward a projected mold side so that compression molding is performed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a compression-molding die, and more particularly to a compression-molding product having a structure in which a skin material is attached to the surface of the product.
The present invention relates to a technique for efficiently molding without defects.

[0002]

BACKGROUND ART Conventionally, as a method for achieving softness and cost reduction of resin-made vehicle interior parts and the like, when a thermoplastic resin is compression-molded, a predetermined skin material is simultaneously attached to the design surface side of the product. It is known how to get involved. Further, in order to improve the design of the product, it is usually required to wind the skin material at the product end portion. Therefore, as a mold structure suitable for such molding, as shown in FIGS. As shown in FIG. 2, a so-called frame-equipped flat die having an intermediate die 4 between a concave die 2 and a convex die 6 which are arranged to face each other is used.

In such a compression molding die, the skin material 10 is placed in the recess 8 provided in the recess 2 in the mold open state (a).
Is set, and the thermoplastic resin material 12 is set on the upper surface of the convex mold 6, and then the concave mold 2 and the intermediate mold 4 are closed as shown in (b) to (c). 1
A closed space is formed by 0 and the intermediate mold 4. After that,
As shown in (d), the concave mold 2 and the intermediate mold 4 are integrally formed into the convex mold 6.
Then, the thermoplastic resin material 12 starts to flow, and compression molding is performed. Therefore, such a mold has a feature that burrs due to variations in material setting positions are less likely to occur, and even if the skin material is set to be wound in any part of the product terminal, It also has an advantage that it can be easily dealt with without adding a special mold structure.

If the product has a thick portion, the cooling time until the resin material solidifies after compression molding becomes long,
Since a problem that productivity deteriorates occurs, as illustrated in FIG. 13, when the product 18 has a stepped shape, the back surface side of the stepped portion is covered with a meat so that a thick portion is not formed. A device for stealing is applied to the mold. That is, the direct pressing block 16 is incorporated in the core portion 14 of the convex mold 6, the negative angle of the meat stealing portion is processed by the direct pressing block 16, and the direct pressing block 1 is cured after the resin material is solidified.
The product 18 can be demolded by pushing up the product 18 at 6.

By the way, in such a die structure, between the intermediate die 4 and the undercut portion of the direct pressing block 16,
A stepped gap consisting of the gap: A and the gap: B is formed, and in the operation stage from (a) to (b), the end of the skin material 10 enters from the gap: A to the gap: B. It is like this. Therefore, if the gap: A is narrow, the end portion of the skin material 10 cannot be smoothly inserted up to the gap: B, and the end of the skin material 10 remains bent, resulting in (c).
When the resin material 12 is filled in the operation steps from (d) to (d), there arises a problem that the skin portion of the product 18 is wrinkled. Therefore, normally, the end portion of the skin material 10 is changed from the gap: A to the gap:
The gap: A is set to be about three times as large as the thickness of the skin material 10 so that B can be smoothly entered without bending and wrinkles do not occur.

However, in such a mold structure, since the clearance A is large, a compression molding stroke (pressurization stroke): S is added in the operation stage from (c) to (d). However, when the width of the gap is enlarged, a gap having a large width of A + S is formed, and the resin material 12 is filled therein, so that the locally thick portion 20 is formed. Was inherent. In other words, in the conventional mold structure, while the meat stealing is performed, the local thick portion 20 having a width of about 25 mm is usually left, and the meat stealing is insufficient.
As a result, there is a problem that the cooling and solidifying time of the resin material after compression molding becomes long, the productivity is lowered, and the weight saving of the product is insufficient.

[0007]

The present invention has been made under the circumstances described above, and the problem to be solved is to improve a compression-molding die to provide a compression-molded article with a skin material. At the time of molding, the skin material is inserted smoothly into the undercut part of the mold to prevent wrinkles from occurring and to prevent the thick part of the resulting compression molded product from forming as much as possible. Especially.

[0008]

In order to solve the above-mentioned problems, in the present invention, (a) a convex type having a protruding core portion and (b) a convex type core portion are arranged around the convex type core portion. An intermediate mold, (c) a concave mold having a recess into which a skin material attached to the surface of the obtained compression molded product is fitted, the concave mold being arranged to face the convex mold, and (d) assembled to the intermediate mold And a slide core that is slidable in conjunction with the opening and closing of the convex mold and the concave mold. With the closing of the convex mold and the concave mold, the slide core becomes a core part of the convex mold. On the other hand, when the skin material is inserted between them and the concave mold is brought into contact with the intermediate mold, the convex mold, the intermediate mold, the concave mold and the slide core are compressed. A closed space filled with the resin material that gives the molded product is formed, They are moved to their concave and intermediate type convex side together in the compression mold, characterized by being configured so that the compression molding is carried out, in which as its gist.

[0009]

[Operation / Effect] In short, according to the present invention, the slide core assembled in the intermediate mold has a skin material between the convex core and the concave core as the mold core is closed. It is designed so that it can be brought into contact with the inside.
In other words, a wide gap is formed between the slide core and the convex core portion until the skin material enters, so that the skin material can be easily inserted without breaking. On the other hand, after the skin material has entered, the width of the gap is narrowed as much as possible.

Then, after the closed space filled with the resin material for giving the compression molded product is formed by the convex mold, the intermediate mold, the concave mold and the slide core, the concave mold and the intermediate mold are integrally moved to the convex mold side. The compression molding is carried out, and at that time, the gap is slightly widened by the compression molding stroke (pressure stroke) so that the resin material can be filled. Thus, when the resin material is filled, the width of the gap formed between the slide core and the convex core portion is substantially stopped at about the width of the compression molding stroke. The thickening can be effectively prevented.

Therefore, by using the compression molding die according to the present invention, the skin material can be smoothly inserted into the undercut portion of the mold, and wrinkles do not occur in the skin portion of the compression molded product. As a result, the incidence of defective products can be effectively reduced. Further, since the meat can be stolen sufficiently, the cooling / solidifying time of the resin material after the compression molding can be advantageously shortened, and the productivity can be improved. Furthermore, the weight of the compression molded product and the material can be reduced. The cost reduction due to the reduction can be advantageously achieved.

[0012]

EXAMPLES In order to clarify the present invention more specifically, typical examples of a compression molding die according to the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows an example of a compression molding die according to the present invention in a mold open state, and FIGS.
FIG. 5 shows the states at the subsequent operating stages. In these figures, 24 is a concave type, and the mounting plate 2
It is fixed to 2 and is arranged above. Then, the concave mold 24 is provided with a concave portion 26 into which the skin material 50 attached to the surface of the obtained compression molded product (product) is fitted, and a slide core 44 to be described later is slidably moved. Angular pin 28 and slide cotter 27
Is fixed.

A convex mold 30 including a flat plate-shaped main body 32 and a core 34 protruding from the central portion of the main body 32 is disposed below the concave mold 24 so as to face the concave mold 24. . Further, a direct-pressing block 36 that forms a negative angle portion (meat steal portion) of the product is integrally incorporated in the core portion 34 so as to form a side surface portion facing a slide core 44 described later. The direct-pressing block 36 is slidable with respect to the core portion 34 in the protruding direction of the core portion.

An intermediate die 40 having an annular shape is arranged around the core portion 34 of the convex die 30,
It is movable up and down with respect to the convex mold 30 by hydraulic pressure or the like. The intermediate die 40 is provided with a recess 42 at a portion facing the direct-pressing block 36, and a slide core 44 for molding an undercut portion of a product is incorporated in the recess 42. A slide rail (not shown) is slidable in a direction perpendicular to the opening / closing direction of the concave mold 24 and the convex mold 30. Further, the slide core 44 is formed with a notch portion 46, which is a cam constituting surface, and a through hole 48 which engage with the slide cotter 27 of the concave mold 24 and the angular pin 28.

In order to perform compression molding using the compression molding die having such a structure, first, the resin material 52 that gives the product is set on the upper surface of the core portion 34 of the convex mold 30, and The skin material 50 attached to the surface is set in the recess 26 of the recess 24. As the skin material 50, various known materials such as a vinyl chloride sheet with a foam layer are used, and as the resin material 52,
Various well-known materials such as long glass fiber reinforced stampable sheets are used. Further, as a material supply method, a flow stamping method or an SPM method can be adopted.

Thereafter, when the mold closing is started and the concave mold 24 is lowered as shown in FIG. 2, the slide core 44 is gradually projected by being guided by the angular pins 28 of the concave mold 24 as the mold is closed. The mold 30 is slid to the core portion 34 side. Here, the gap between the slide core 44 and the direct pressing block 36 is ensured to be sufficient until the end portion of the skin material 50 reaches below the undercut portion of the direct pressing block 36. There is. Therefore, the problem that the skin material 50 bends when it is inserted into the gap can be avoided, and the occurrence rate of defects such as wrinkles can be advantageously reduced.

Then, as shown in FIG. 3, when the skin material 50 enters the undercut portion of the direct pressing block 36,
The slide core 44 is brought into contact with the direct pressing block 36 so that the gap between them is narrowed as much as possible, and the slide core 44 is positioned by the slide cotter 27 at that position. At the same time, the concave mold 24 is brought into contact with the intermediate mold 40, so that the concave mold 24,
The convex mold 30, the intermediate mold 40, and the slide core 44 form a closed space filled with the resin material 52. In addition,
At this time, the intermediate mold 40 is pushed up to a position above the convex mold 30 by a cushion pin (not shown) arranged so as to penetrate the main body 32 of the convex mold 30.

Next, the concave mold 24 and the intermediate mold 40 are integrally moved downward to the convex mold 30 so as to compress the closed space, so that the resin material 52 is crushed as shown in FIG. As a result, compression molding is performed over the entire closed space. At this time, the width of the gap between the slide core 44 and the direct-pressing block 36 is slightly widened by the compression molding stroke (pressurization stroke). Since it is narrowed as much as possible, even if it is slightly widened here, it can be stopped substantially within the width of the stroke of compression molding, and thus thickening of the compression molded product at the relevant portion can be achieved. It can be effectively prevented.

Therefore, in such a compression molding die, it is possible to sufficiently steal meat while preventing wrinkles on the skin portion of the product, reduce the weight of the product, and reduce the cost by reducing the material. Can be advantageously achieved, and the cooling / solidifying time of the resin material after compression molding can be advantageously shortened to improve productivity.

When the cooling and solidification of the resin material is completed, the concave mold 24 is raised to open the mold,
Along with that, the slide core 44 is pulled back to the original position by the guide of the angular pin 28. At this time, the intermediate die 40 does not move due to its own weight. And FIG.
As described above, the intermediate mold 40 and the direct pressing block 36 lift the product 53 together with the ejector pin (not shown), and the direct pressing block 36 further ejects the product 53 together with the ejector pin (not shown). It is taken out.

Next, a different example of the compression molding die according to the present invention will be described with reference to FIGS. In the following description, the same components as those in the above-described embodiment are designated by the same reference numerals and detailed description thereof is omitted.

That is, in this embodiment, a guide member 54, which is a member corresponding to the slide cotter 27 and the angular pin 28 in the compression molding die of the above-described embodiment, protrudes from the main body portion 32 of the convex mold 30 side. It has been fixed to. Then, according to the opening and closing of the concave mold 24 and the convex mold 30, the guide member 54 can move in and out through the through hole 56 provided in the bottom wall portion of the intermediate mold 40 into the recess 42 in which the slide core 44 is attached. It is like this.

The intermediate die 40 has a slide core 44.
To extend in and out of the recess 42 in which
A bolt 58 is slidably attached through the side wall of the intermediate die 40. The tip of the bolt 58 is fixed to the slide core 44, while the bolt 58
A spring 60 is attached between the head of the mold and the outer surface of the intermediate mold 40. As a result, when the slide core 44 is moved toward the core portion 34 side of the convex mold 30, the spring 60 is compressed, and the spring 6
With the restoring force of 0, the slide core 44 can be returned to its original position.

A specific operation sequence for performing compression molding using the compression molding die having the above structure will be described below. First, in the mold open state shown in FIG. 6, a resin material 52 that gives a product is set on the upper surface of the core portion 34 of the convex mold 30, and the concave portion 26 of the concave mold 24 is attached to the surface of the product. The skin material 50 is set. Next, when mold closing is started and the concave mold 24 is lowered, the concave mold 24 is brought into contact with the intermediate mold 40 as shown in FIG. 7, and at this stage, the resin material 52 is finally filled. A closed space larger than the space (see FIGS. 9 and 10) is formed. Therefore, this mold structure has an advantage that variations in the material set position can be more advantageously absorbed. At this stage, the edge of the skin material 50 is
Since it is inserted into this large closed space, there is no risk of breaking or the like.

Further, when the concave mold 24 and the intermediate mold 40 are lowered integrally, the guide member 54 enters the recess 42 through the through hole 56 of the intermediate mold 40 as shown in FIG. The slide core 44 is pushed out by the guide member 54 and gradually slid toward the core portion 34 side of the convex mold 30. Even at this stage, a sufficient gap is secured between the slide core 44 and the direct pressing block 36 until the end portion of the skin material 50 enters below the undercut portion of the direct pressing block 36. Therefore, the problem that the skin material 50 is bent can be avoided, and the occurrence rate of defects such as wrinkles can be advantageously reduced. Further, in this embodiment, the flow of the resin material 52 is started at this stage when the slide core 44 is slidingly moving.

Before the flow of the resin material 52 reaches the position of the slide core 44, the skin material 50 enters the undercut portion of the direct pressing block 36 as shown in FIG. 36, the gap between them is narrowed as much as possible, and the slide core 44 has the guide member 54 at that position.
It is positioned at. Thus, the concave mold 24, the convex mold 30, the intermediate mold 40, and the slide core 44 make the resin material 5
A completely closed space filled with 2 is formed. At this time, the intermediate mold 40 is a cushion pin (not shown) arranged so as to penetrate the main body 32 of the convex mold 30,
It is pushed up to a position slightly above the convex mold 30.

Further, as the concave mold 24 and the intermediate mold 40 are integrally moved downward to the convex mold 30 side so as to compress the closed space, the resin material 52 is closed as shown in FIG. It is spread over and compression molded. At that time, the width of the gap between the slide core 44 and the direct pressing block 36 is slightly widened by the compression molding stroke (pressurization stroke). In the present embodiment, the compression is performed at the stage of FIG. Since the molding is progressing halfway, the stroke of compression molding required until the resin material 52 is completely filled thereafter becomes smaller than that of the above-mentioned embodiment. Therefore, the present embodiment has an advantage that the thick portion of the product can be effectively reduced.

When the cooling and solidification of the resin material is completed, the concave mold 24 is raised to open the mold. At this time, the intermediate die 40 does not move due to its own weight. Next, as shown in FIG. 11, when the intermediate die 40 and the direct pressing block 36 lift up the product 53, the guide member 5
4 gradually retreats from the inside of the recess 42, and accordingly, the slide core 44 is pulled back to the original position by the restoring force of the spring 60. Further, the direct pressing block 36
By ejecting the product 53 together with the ejector pin (not shown), the product 53 is taken out as shown in FIG.

Therefore, even in such a compression molding die, it is possible to sufficiently steal meat while preventing wrinkles from being formed on the skin portion of the product, and to reduce the weight of the product and the cost by reducing the material. This can be achieved advantageously, and the cooling and solidifying time of the resin material after compression molding can be shortened advantageously, and the productivity can be enhanced.

The representative embodiments of the present invention have been described above in detail. However, the present invention is not limited by the description of such embodiments.
Needless to say. Further, in addition to the above-described embodiments, the present invention may be modified in various ways based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Should be understood.

For example, in the above-mentioned embodiment, the concave mold 24 is arranged on the upper side and the convex mold 30 is arranged on the lower side, but the convex mold 30 is arranged on the upper side and the concave mold 24 is arranged on the lower side, and the concave portion of the concave mold 24 is arranged. 26
The resin material 52 may be placed on the skin material 50 set in the above.

Further, in the above embodiment, the slide core 44 is provided in the mold only on the undercut portion side of the product 53 on the left side in the drawing, but the present invention is not limited to this, and the same slide core on the right side in the drawing is also provided. May be provided. As a result, it is possible to prevent the right end portion of the skin material 50 from riding on the intermediate die 40.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an example of a compression molding die according to the present invention in a mold open state.

FIG. 2 is an explanatory cross-sectional view showing a state in which the mold closing of the concave mold and the intermediate mold has started in the mold of FIG.

FIG. 3 is an explanatory cross-sectional view showing a state in which the mold closing of the concave mold and the intermediate mold is completed in the mold of FIG.

4 is a cross-sectional explanatory view showing a state where compression molding is completed in the mold of FIG.

5 is a cross-sectional explanatory view showing a state where a product is taken out from the mold of FIG.

FIG. 6 is a half cross-sectional explanatory view showing a different example of the compression molding die according to the present invention in a mold open state.

7 is a half cross-sectional explanatory view showing a state in which the mold closing of the concave mold and the intermediate mold is completed in the mold of FIG.

8 is a half cross-sectional explanatory view showing a state where compression molding has started in the mold of FIG.

9 is a half cross-sectional explanatory view showing a state where compression molding is in progress in the mold of FIG.

10 is a half cross-sectional explanatory view showing a state where compression molding is completed in the mold of FIG.

FIG. 11 is a half cross-sectional explanatory view showing the mold open state after compression molding in the mold of FIG. 6;

FIG. 12 is a half cross-sectional explanatory view showing a state where a product is taken out from the mold of FIG.

FIG. 13 is a cross-sectional explanatory view showing an example of a conventional compression molding die, in which (a) is a mold open state, (b) is a mold closing start state, and (c) is a mold closing completed state. d) shows the completion of compression molding.

[Explanation of symbols]

 22 Mounting plate 24 Recessed type 26 Recessed portion 27 Slide cotter 28 Angular pin 30 Convex type 32 Main body portion 34 Core portion 36 Direct pressing block 40 Intermediate type 42 Recessed portion 44 Slide core 46 Notch portion 48 Through hole 50 Skin material 52 Resin material 53 Product 54 Guide member 56 Through hole 58 Bolt 60 Spring

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29L 9:00

Claims (1)

[Claims] 1. A convex mold having a protruding core portion, an intermediate mold arranged around the convex core portion, and a recess into which a skin material attached to the surface of the obtained compression molded product is fitted. And a slide core that is assembled to the intermediate mold and that is slidable in association with opening and closing of the convex mold and the concave mold. With the closing of the mold and the concave mold, the slide core
The convex core portion is brought into contact with a place where a skin material is inserted between them, and the concave die is brought into contact with the intermediate die, thereby forming the convex die, the intermediate die, The concave mold and the slide core form a closed space filled with a resin material that gives a compression molded product, and the concave mold and the intermediate mold are integrally moved to the convex mold side to perform compression molding. A mold for compression molding characterized in that it is configured.