JP2023056181A - Metal mold device - Google Patents

Abstract

To provide a metal mold device capable of preventing the deformation and cracking of a core during solidification shrinkage of a melt and producing a casting excellent in dimensional accuracy and productivity.SOLUTION: A metal mold device for casting comprises a movable template and a fixed template, in which the movable template has a structure that a pin is integrally arranged in a position inside a core in a direction of solidification shrinkage of a melt and corresponding to a thick-walled portion of a casting to produce.SELECTED DRAWING: Figure 1

Description

The present invention relates to a mold apparatus for casting.

Many parts (castings) that constitute many products such as automobiles and home appliances are manufactured using a die casting method. For example, when casting a cylinder block (engine block) using a die casting method using molten metal such as an aluminum alloy, casting is performed with a core made of sand (sand core) inserted in the mold. conduct. As a result, a water channel (water jacket) for the cylinder block can be formed, and closed-deck cylinder blocks can be produced.

However, shrinkage during the solidification process of the molten metal may cause deformation and cracking of the core, resulting in low dimensional accuracy of the cast product.

Patent Document 1 discloses a technique in which a core ring is inserted into the inner diameter side of the core together with the core so that the shrinkage of the core ring is suppressed via the core even when the solidification shrinkage of the molten metal is larger than the predicted value. there is

JP 2009-291823 A

Although the technology described in Patent Document 1 can produce a product that satisfies standard dimensions, it is necessary to insert a core ring, which is a component separate from the mold for casting the product, before casting. Therefore, it was expected that the productivity would be lowered by the time required for inserting the coring, and there was room for further study from the viewpoint of productivity.

The present invention has been made in view of such problems, and provides a mold apparatus that can prevent deformation and cracking of the core during solidification shrinkage of the molten metal, and can manufacture castings with excellent dimensional accuracy and productivity. intended to provide

One aspect for achieving the above object is a mold apparatus for casting having a movable side mold plate and a fixed side mold plate,
The movable side mold plate has a structure in which a pin is integrally arranged at a position inside the core, in the direction of solidification and contraction of the molten metal and at a position corresponding to the thick part of the casting to be manufactured.

In the mold apparatus according to the present invention, pins (casting pins) for preventing deformation and cracking of the core during solidification and shrinkage of the molten metal are integrally incorporated in the movable side plate of the mold apparatus in advance. . Therefore, deformation and cracking of the core during casting are suppressed, and since there is no need to insert a separate part such as a core ring into the mold, excellent productivity can be maintained.

According to the present invention, it is possible to provide a mold apparatus capable of preventing core deformation and cracking during solidification and shrinkage of molten metal, and capable of manufacturing castings with excellent dimensional accuracy and productivity.

It is a figure for demonstrating an example of the arrangement|positioning relationship of a core and a pin in this embodiment. FIG. 4 is a diagram for explaining an example of a casting process cycle when producing castings using the present embodiment; FIG. 4 is a partial cross-sectional view for explaining an example of arrangement of components in the embodiment;

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings are simplified as appropriate.

As shown in FIG. 3, the mold apparatus according to the present embodiment (hereinafter sometimes referred to as the present mold apparatus) is a mold for casting having a movable mold plate 3 and a fixed mold plate 4. It is a device. As shown in FIGS. 1 and 3, the movable-side mold plate 3 is located inside the core 1 (in FIG. ) and at a position corresponding to the thick-walled portion of the casting to be manufactured, a pin 2 (die cast pin) is integrally arranged.
FIG. 1 is a diagram for explaining an example of the arrangement relationship between cores and pins in this embodiment. Moreover, FIG. 3 is a partial cross-sectional view for explaining an example of arrangement of each component in this embodiment. Only the characteristic parts of this mold apparatus will be described below. Therefore, other structures are not particularly limited, and the structures of conventionally known mold devices can be appropriately applied.

In this mold apparatus, as shown in these figures, a pin 2 for preventing deformation and cracking of the core 1 when the molten metal 5 solidifies and shrinks is attached to the mold apparatus, specifically, the movable side mold plate. It is incorporated in 3 specific positions. Since the pin 2 is arranged at a specific position in this way to support the core 1 during casting, deformation and cracking of the core 1 due to solidification shrinkage of the molten metal during casting can be suppressed.
If the pin 2 is of an insertion type, a step of inserting the pin is required before the mold closing step S2, which will be described later. However, in this mold apparatus, since the pins 2 are integrally incorporated into the mold in advance, there is no need to add such a process and the production time is not affected, so continuous production is possible. It is possible to maintain excellent productivity.

The pin 2 for preventing deformation and cracking of the core 1 is positioned on the inner diameter side of the core 1, in the direction X of the solidification shrinkage of the molten metal 5 and in the thick part of the product (casting) to be cast. to be placed. A position on the inner diameter side of the core 1, which is a thick-walled portion of the casting, is subjected to greater pressure due to solidification shrinkage of the molten metal than other portions, and is easily deformed. Therefore, by arranging the pin 2 on the inner diameter side of the core 1 at a position where the thick portion of the casting receives the solidification contraction of the molten metal 5, surface pressure due to the solidification contraction of the molten metal is applied to the entire pin 2 during casting. , (for example, local) deformation and cracking of the core 1 can be suppressed.
The number of pins 2 can be appropriately adjusted according to the structure of the product to be cast and the structure of core 1, and is not particularly limited. Further, in the present mold apparatus, the pin 2 is arranged at a position on the inner diameter side of the core 1, in the direction X of solidification and shrinkage of the molten metal 5 and at a position corresponding to the thick portion of the product to be cast. The pins 2 may be arranged at other positions as long as the effect can be obtained. Further, the shape of the pin 2 is not particularly limited, and can be appropriately set within the range in which the effects of the present invention can be obtained.

FIG. 1 shows, as an example of the core 1, the shape of the core used when casting a cylinder block. Incidentally, the journal portion of the cylinder block is thick, and the amount of solidification shrinkage of the molten metal 5 is large. For this reason, a plurality of pins 2 are arranged on the inner diameter side of the core 1 in the portion (portion corresponding to the journal) that becomes the thick wall portion of the waterway (water jacket) of the cylinder block. can be prevented, and the standard dimensions of the casting product can be easily satisfied. The shape of the core 1 can be appropriately set according to the shape of the product to be cast, and is not particularly limited.

A core made of sand (sand core) can be used as the core 1, and a casting having a hollow structure can be produced by breaking the core by vibration in a post-process and discharging it out of the product. The core 1 can consist of one or more parts.

As the molten metal 5 used for casting, a conventionally known one can be used. For example, a molten metal such as aluminum, magnesium, zinc, or copper or an alloy (eg, non-ferrous metal) can be used.

Here, FIG. 2 shows a diagram for explaining an example of a casting process cycle when producing a casting using this mold apparatus. As shown in FIG. 2, a casting can be manufactured through the following steps using the mold apparatus shown in FIGS. When mass-producing castings, the steps S1 to S5 described below are regarded as one cycle, and this cycle can be repeated continuously for the required number of cycles.

Core inserting step S1 for inserting the core 1 into the mold device.
A mold closing step S2 in which the movable side mold plate 3 and the fixed side mold plate 4 are combined.
A casting and solidification step S3 in which molten metal 5 such as an aluminum alloy is poured into the closed mold device and the molten metal 5 is solidified in the mold device.
mold opening step S4 for moving the movable side mold plate 3; as well as,
After the core 1 is removed, the product is taken out from the mold device (S5).

For example, when the casting is a cylinder block, a cylinder liner can be inserted at the same time in the core insertion step S1. In this mold apparatus, as described above, the pins 2 are integrated in advance at specific positions of the movable side mold plate 3. Therefore, at the same time as the mold closing step S2, the specific positions of the core 1 are moved to the pins 2. can be supported by Therefore, in the casting and solidification step S3, the core 1 is not deformed, and a casting with excellent dimensional accuracy can be cast while maintaining excellent productivity. Since a conventionally known casting method (for example, die casting method) can be used other than using the present mold apparatus described above, a specific description of each step is omitted here.

According to the invention according to the present embodiment described above, it is possible to prevent deformation and cracking of the core when the molten metal solidifies and shrinks, and it is possible to manufacture a casting excellent in dimensional accuracy and productivity.

It should be noted that the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the invention. This mold apparatus can be applied to many parts (castings) that make up many products such as automobiles and home electric appliances that use cores in casting, and its usage is not particularly limited.

1 Core 2 Pin 3 Movable Side Template 4 Fixed Side Template 5 Molten Metal X Direction of Solidification and Shrinkage

Claims (1)

A mold apparatus for casting having a movable side mold plate and a fixed side mold plate,
The movable side mold plate has a configuration in which a pin is integrally arranged at a position inside the core, in the direction of solidification and shrinkage of the molten metal and at a position corresponding to the thick part of the casting to be manufactured. Characterized mold equipment.

Images