JP2581982Y2 - Mold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die used for die casting or injection molding.

[0002]

2. Description of the Related Art In a mold used for die casting or injection molding, the back side of the mold, which does not come into contact with the molten metal at the time of product molding, is close to room temperature, but the surface of the cavity in contact with the molten metal. Thermally expands rapidly, and there is a remarkable difference in the temperature between the cavity surface side and the mold back side inside the mold. As a result, not only does the mold warp, which affects the product dimensions, but there is also a case where a so-called burr blowing accident occurs due to a partial gap formed on the mold mating surface.

Therefore, conventionally, the thermal deformation of the mold is suppressed by force, the mold is processed in advance in consideration of the thermal deformation, or the back side of the mold is forcibly heated to the same temperature as the molten metal. Means were taken, but all of the methods had a problem in time response, and could not reliably suppress thermal deformation.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the invention is to provide a mold capable of reliably suppressing thermal deformation during product molding.

[0005]

SUMMARY OF THE INVENTION A mold according to the present invention that achieves the above object is to suppress a rapid thermal expansion due to heat input from a molten metal filled in the cavity into a cavity inside the mold. And a heating chamber for generating thermal deformation commensurate with the amount of thermal expansion on the cavity side is formed on the back side of the mold inside the mold. In this case, that the cooling chamber and the cooling chamber and the heating chamber both heat formed to check the order not to interfere with each other between the heating chamber and further installing insulation in the air chamber preferable.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The mold 1 may be a direct engraving type mold or a fitting type mold in which a nesting mold 1a is fitted into the main mold 1b. Is preferred.

A cooling chamber 3 is formed inside the mold 1, in the case of a fitting type mold, inside the nest 1 a, on the cavity 2 side, and a heating chamber 5 is provided on the mold back side 4. An empty space 6 is formed between the cooling room 3 and the heating room 5.

The cooling chamber 3 is for suppressing a rapid thermal expansion due to heat input from the molten metal injected and filled into the cavity 2. The cooling chamber 3 is brought close to the cavity 2 side and the cavity side 3 a is brought to the surface of the cavity 2. It is formed in a shape conforming to the shape, and a cooling medium such as cooling water is supplied to the inside thereof, or an electric cooling means is provided.

The heating chamber 5 is for performing thermal control for generating thermal deformation corresponding to the amount of thermal expansion on the cavity 2 side. An appropriate size is formed in the innermost part, and a heating medium such as high-temperature water is supplied into the inside, or an electric heating means is provided.

The vacant chamber 6 is provided for preventing the heat of both the cooling chamber 3 and the heating chamber 5 from interfering with each other, and between the cooling chamber 3 and the heating chamber 5. 5 is formed so as to be isolated.

The vacant space 6 may be a mere space literally, or a heat insulating material is installed inside the cooling room 3 and the heating room 5 in order to prevent the heat of both the cooling room 3 and the heating room 5 from interfering with each other. May be.

[0012]

According to the mold of the present invention, the rapid thermal expansion on the cavity side due to the heat input from the molten metal injected and filled into the cavity can be prevented. is rapidly suppressed by the cooling action of the cooling chamber, the
Occasionally, the back side of the mold can be thermally expanded quickly in proportion to the amount of thermal expansion on the cavity side by the heating effect of the heating chamber, and as a result, thermal deformation during product molding can be reliably suppressed, and the mold This prevents warpage of a burr and prevents the occurrence of a so-called burr-blowing accident, and makes it possible to cast a product with high dimensional accuracy. Temperature control becomes easy, and thermal deformation can be suppressed more reliably.

Further, according to the mold of the present invention, since an empty space is formed between the cooling chamber and the heating chamber, the heat of both the cooling chamber and the heating chamber does not interfere with each other. As a result, temperature control for the mold becomes easier, and thermal deformation during product molding can be suppressed more reliably.

According to the third aspect of the present invention, since the heat insulating material is provided inside the empty space formed between the cooling chamber and the heating chamber, the heat of both the cooling chamber and the heating chamber is further improved. Do not interfere with each other, and as a result, the temperature of the mold can be easily controlled, and thermal deformation can be suppressed more reliably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of a mold device according to the present invention.

[Explanation of symbols]

1: Mold 2: Cavity 3: Cooling room
4: Mold back side 5: Heating room 6: Empty room 7: Insulation material

Claims (3)

(57) [Scope of request for utility model registration] 1. The key in the cavity inside the mold.
Sudden heat due to heat input from the molten metal filled in the cavity
In addition to forming a cooling chamber to suppress expansion ,
Seen in the thermal expansion amount of the cavity side mold back side of the section
A mold having a heating chamber for generating combined thermal deformation . 2. The cooling chamber between the cooling chamber and the heating chamber.
The mold according to claim 1, wherein an empty chamber is formed for preventing heat of both the heating chamber and the heating chamber from interfering with each other . 3. A process according to claim 2 mold, wherein the installed insulation in the air chamber.