JPH0744374Y2 - Aluminum alloy casting mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a die for obtaining a cast product made of an aluminum alloy by low-pressure die casting or gravity die casting.

(Prior art and problems) In low-pressure die casting or gravity die casting, which obtains conventional aluminum alloy castings, air-cooling is used to obtain high-density and high-quality castings by properly controlling directional solidification. In many cases, a water-cooling mold is used, but this water-cooling has a problem that it is difficult to control accurately and partially overcools. Therefore, the water-cooling effect is used insensitively. Therefore, the reality is that a high-density and high-quality cast product has not yet been obtained.

(Purpose) The present invention has been made in view of the above problems, and it is possible to easily obtain a high-quality cast product that has a high cooling effect by water cooling and has a high density and is also properly controlled in directional solidification. To provide a simple mold.

(Means for Solving the Problems) In order to achieve the above object, the mold of the present invention is made of an iron-based metal material, and a portion of the cavity portion corresponding to the thick portion of the cast product is thin. It is characterized in that a copper alloy or an aluminum alloy in which a water-cooling pipe is cast-wrapped is provided as a backup material integrally on the back part of a shell-shaped thin mold formed thinner than the part corresponding to the part. It is a thing.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. The lower mold (A) and the upper mold (B) are shell-shaped thin molds (1) (1) 1A) and the thin mold (1)
In the back part of (1A), the water cooling pipes (2) and (2A) are cast-in and the backup materials (3) and (3A) made of copper alloy are integrally provided.

The shell shell-shaped thin molds (1) (1A) form a thin portion corresponding to the thick portion of the casting in the cavity (C) and a thick portion corresponding to the thin portion of the casting. ing. That is, the part that you want to cool quickly to control the directional solidification of the cast product (the part you want to accelerate solidification).
The portion corresponding to is thinned, and the portion corresponding to the portion where coagulation is desired to be delayed is thicker than the other portions.

Further, since the backup materials (3) and (3A) are made of a copper alloy having good thermal conductivity, the cooling effect of the molds (A) and (B) is high.

In the figure, (4) is a product extrusion pin, (5) is an extrusion plate,
(6) is a molten metal injection port, and (7) is a mold matching key.

Next, a situation in which an aluminum alloy casting is cast by the molds (A) and (B) configured as described above will be described.

In the state shown in FIG. 1, the molten aluminum alloy is injected from the molten metal inlet (6), and the molten metal is pushed up and held while the cavity (C) is filled with the molten metal. As a result, the molten aluminum alloy in the cavity (C) begins to solidify and the cooling water is passed through the water cooling pipes (2) (2A) (starting of water flow is determined in advance by experiments, etc.) (A)
(B) is cooled. Cooling of this mold (A) (B)
Since the copper alloy with good thermal conductivity is used as the backup material (3) (3A), the thin molds (1) (1A) will be cooled in a short time and effective cooling will be performed. In addition, the thin molds (1) and (1A) have thinner parts that they want to cool faster, so they will cool faster than other parts and cool the cast product, and the cast product controls directional solidification correctly. It will solidify while being treated.

In this way, when the solidification progresses and an appropriate time elapses (determined by preliminary experiments etc.), the water cooling pipe (2) (2
Stop the flow of cooling water to A), and set the water cooling pipes (2) (2
Blow off the residual water in A) with compression air.

Further, by continuously closing the mold and pushing up the molten metal, the entire molten metal in the cavity (C) is solidified, the pushing of the molten metal into the molten metal inlet (6) is stopped, and then the upper die (B) is moved upward. And the extrusion pin (4) is lowered by an extrusion plate (5) at an appropriate position to extrude the aluminum alloy casting adhered to the upper die (B) and drop it on a casting tray (not shown) or the like. Of.

Although the backup materials (3) and (3A) are made of copper alloy in the embodiment, the same effect can be obtained even if they are made of aluminum alloy.

Also, the thin-walled part of the shell-shaped thin mold (1) (1A) is 3 mm.
As a result of experiments, it was found that the transmission of the cooling temperature becomes extremely good when the degree is set to a certain level.

Further, when it is necessary to partially quench the cast product, an insert or a die-cast pin which is also used in the conventional mold may be provided.

(Effect) As is apparent from the above description, the present invention integrally provides a backing material made of a light alloy having good heat conductivity in which a water-cooling pipe is cast and wrapped on the back of a shell-shaped thin mold. In addition, since the thickness of the thin mold is changed according to the thickness of the cast product, the cooling effect of the cast product can be enhanced and the directional solidification can be controlled properly for casting, resulting in high density and high quality. A cast product can be obtained and the effect is remarkable.

[Brief description of drawings]

 FIG. 1 is a vertical sectional view showing an embodiment of the present invention. (1) (1A): Shell shell thin mold (2) (2A): Water cooling pipe (3) (3A): Backup material

Claims (1)

[Scope of utility model registration request] 1. A shell-shell-shaped thin mold made of an iron-based metal material, wherein a portion of a cavity corresponding to a thick portion of a cast product is formed thinner than a portion corresponding to a thin portion. An aluminum alloy casting mold characterized in that a copper alloy or an aluminum alloy, in which a water cooling pipe is cast and wrapped, is integrally provided on the back as a backup material.