JP3904539B2 - Die cast molding equipment for die casting production - Google Patents

Description

  The present invention relates to a die-cast molding apparatus for producing a die-cast casting that forms a frame-shaped casting.

In general, casting refers to a method of making a product by pouring molten metal such as aluminum into a mold made of sand or the like.
Aluminum, which is a metal used in this casting, is about one-third the weight of iron, and is excellent in heat transfer, corrosion resistance, and workability. Specifically, it is used for soft drinks and beer cans, aluminum wheels for automobiles, Shinkansen bodies, kitchen products such as pots, pans and kettles, window frames (sashes) and the like.
On the other hand, die casting has a very high dimensional accuracy and can reduce processing in a later process and is a manufacturing method suitable for mass production. Furthermore, this die-cast has a feature that the surface of the product is smooth and excellent, and thus surface treatment such as plating and painting is easy.

By the way, in conventional die casting, in order to form an uneven surface inside a frame-shaped product (for example, a sash or a frame), it is usual to manufacture using a slide mold. In this case, as shown in FIG. 5, there is no problem when the uneven surface is formed at a sufficient distance from the corner of the frame-shaped product, that is, at a place separated from the corner, but the frame as shown in FIG. A problem arises when uneven portions are formed at the corners of the shaped product.
To describe this problem in detail, after forming the aluminum product, when the movable mold 30 is moved and the product is taken out, a space 40 for retreating the slide mold (core) 71 for forming the uneven portion is necessary. It becomes. This is because if the space 40 is not present, the projection of the slide mold (core) 71 and the recess formed in the frame-shaped product remain engaged, and the movable mold 30 cannot be moved.
Then, as shown in FIG. 6, if an attempt is made to form irregularities at the corners, the molten metal (aluminum) enters the space 40 in which the slide mold (core) 71 retreats (shown by hatching in the figure). .

Therefore, it is an indispensable requirement to be able to form a partition wall for preventing the molten metal from escaping and entering the space 40 for the slide mold (core) 71 to retreat during product removal in the casting process. When the uneven surface is in close contact with the corner of the frame-shaped product, not only one surface inside the product corner but also a part of the other adjacent surface must be formed by the slide mold (core) 71. Therefore, it was technically impossible to form a partition wall. For this reason, such a construction method is impossible, and it has been a common sense method to form an uneven portion by machining after product casting or to attach a separate part having the uneven portion in advance.
However, since this is inferior to a die-cast integrally cast product using a slide mold in terms of cost, uniformity, etc., improvement has been desired.
Then, the objective of this invention is providing the die-cast shaping | molding apparatus which can form an uneven | corrugated | grooved part also in a corner | angular part using a slide metal mold | die.

According to the first aspect of the present invention, in a die cast molding apparatus for producing a die cast product, a pair of molds that can be opened and closed in one direction and that form a cavity for forming a frame-shaped cast product, and a frame shape A first slide mold having a projection for forming a concavo-convex portion inside the frame-shaped casting formed by the cavity, and the first slide mold completes the casting, and the projection and the frame shape A first driving device for driving the first slide mold in a direction in which the concave and convex portion formed on the inner side of the casting separates; and a space in which the first slide mold moves, and this space A second slide mold that forms a partition wall that prevents the molten metal injected into the frame-shaped cavity from entering, and the second slide mold is driven in a direction intersecting the first slide mold And a second drive device After the formation is completed, the second slide mold is retracted by the second drive means, and the first slide mold is placed by the first drive means in the space after the second slide mold is retracted. The object is achieved by moving and allowing the pair of molds to be opened.

  According to a second aspect of the present invention, in the first aspect of the present invention, a hydraulic cylinder is used for the first driving means and the second driving means.

  According to the first and second aspects of the present invention, even the corner portion of the frame-shaped product can be provided with a shape such as a concavo-convex portion by a die-cast molding apparatus regardless of machining after product casting.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a perspective view showing an appearance of a die casting apparatus. This die casting apparatus includes a fixed mold 10 and a movable mold 30, and in a state where the mold is closed, the molten metal is fed into a cavity 20 provided inside to mold a product. The aluminum melt to be fed is 680 ° C. to 700 ° C., and the aluminum product is molded by feeding it into the cavity 20 at a high pressure.
After molding, the movable mold 30 is moved and the mold is opened to take out the product, the mold is closed again, and the next molding is sequentially performed.

FIG. 2 is a plan view of the fixed mold 10 of the die cast apparatus according to the present embodiment, and FIG. 3 is a side view of the movable mold 30 and the fixed mold 10 of the die cast apparatus according to the present embodiment. In this example, the concavo-convex portion 50 is formed in the vicinity of the corner of the frame-shaped product on the assumption that the frame-shaped product is molded by a die casting apparatus. In order to form the concavo-convex portion 50, a corner forming slide mold (core) 70 provided with a protrusion is installed by a hydraulic cylinder 72 so as to be movable in the direction of arrow a in the figure.
Further, the partition-forming slide mold 80 is installed so as to fill a space when the corner-forming slide mold 70 moves in the arrow a direction. The partition-forming slide mold 80 can be moved in the direction of arrow b in the figure by a hydraulic cylinder 82. Therefore, in this example, the corner-forming slide mold 70 and the partition-forming slide mold 80 move in a direction orthogonal to each other, but they do not necessarily need to be orthogonal and in a direction crossing each other. I just need it.

The partition-forming slide mold 80 prevents the molten metal from entering the space in which the corner-forming slide mold 70 moves when molten metal is injected into the frame-shaped cavity 20 at a high pressure to form a frame-shaped product. Work to protect.
When the aluminum molding is completed, the movable mold 30 is moved to take out the frame-shaped product on which the irregularities are formed, but the projections formed on the corner-forming slide mold 70 and the irregularities formed on the frame-shaped product. Since the part 50 is engaged, the movable mold 30 cannot be moved.
Therefore, as shown in FIG. 4, the partition-forming slide mold 80 is moved by the hydraulic cylinder 82 in the direction of the arrow b in the figure, resulting in a space there and the corner-forming slide mold. Space is secured for the mold 70 to move in the direction of arrow a. Then, the corner-forming slide mold 70 is moved to the secured space by the hydraulic cylinder 72, and at this time, the protrusions formed on the corner-forming slide mold 70 and the irregularities formed on the frame-shaped product. The engagement with the portion 50 is released, and the movable mold 30 can be moved.

In the above example, the corner-forming slide mold 70 and the partition-forming slide mold 80 are both installed in the fixed mold 10, but either or both of them can be moved as long as their functions are not hindered. It is also possible to install in the mold 30.
Further, the corner portion forming slide mold 70 and the partition wall forming slide mold 80 are not limited to one pair, and a plurality of pairs may be provided as necessary.
The driving means for the corner forming slide mold 70 and the partition forming slide mold 80 is not limited to the hydraulic cylinder shown in this example, and can be arbitrarily selected. For example, it can be driven by a pneumatic cylinder, a servo motor, or the like.

The frame-shaped die cast product described in this embodiment does not necessarily have a rectangular shape (frame shape), and an arbitrary shape can be assumed. For example, it can be applied to convex shapes, star shapes, and polygons.
The partition wall slide mold 70 not only prevents the molten metal escape but also forms a portion of the inner surface of the frame-shaped product that faces the slide mold, and also forms a corner inner surface forming slide mold when the molten metal is injected. It also functions as a wedge to prevent mold retreat.
Note that the partition wall slide mold is not necessarily required to have a shape that fills all the space required for the movement of the corner inner surface formation slide mold. May be provided.

It is the perspective view which showed the external appearance of the die-cast apparatus, and is the figure which showed the state which the fixed mold | type and the movable mold | type opened. It is the figure which showed the top view of the die-cast apparatus which concerns on this embodiment. It is the figure which showed the side view of the die-cast apparatus which concerns on this embodiment. It is a side view for demonstrating the motion of the die-cast apparatus which concerns on this embodiment. It is the figure which showed the top view and side view explaining the example which forms an uneven | corrugated | grooved part in a frame-shaped product with the conventional die-cast apparatus which concerns. It is a side view explaining the example which forms an uneven | corrugated | grooved part in the corner | angular part of a frame-shaped product with the conventional die-cast apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fixed type | mold 20 Frame-shaped cavity 30 Movable type | mold 40 Space 50 Uneven | corrugated | grooved part 70 Sliding mold 71 for corner | angular part formation Slide mold 72 Hydraulic cylinder 80 Slide mold 82 for bulkhead formation Hydraulic cylinder

Claims (2)

In die casting equipment for die casting production,
A pair of molds capable of opening and closing in one direction and forming a cavity for forming a frame-shaped casting ;
A first slide mold having a projection for forming an uneven portion inside a frame-shaped casting formed by a frame-shaped cavity;
A first drive device for driving the first slide mold in a direction in which the first slide mold completes casting and the projection and the concavo-convex part formed inside the frame-shaped casting are separated from each other; ,
A second slide mold that fills a space in which the first slide mold moves and forms a partition wall that prevents the molten metal injected into the frame-shaped cavity from entering the space;
A second drive device for driving the second slide mold in a direction intersecting the first slide mold,
After completion of casting, the second slide mold is retracted by the second drive means, and the first slide mold is saved by the first drive means in the space after the second slide mold is retracted. A die-cast molding apparatus for producing a die-casting product, wherein the pair of molds can be opened.   2. A die cast molding apparatus for producing a die cast casting according to claim 1, wherein hydraulic cylinders are used for the first drive means and the second drive means.

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