JP2003080343A - Metallic mold for casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic mold for casting in which thermal fatigue in a product-shaped part is reduced by separately controlling a temperature of the product-shaped part, so that the other portion and service life in this product-shaped part can be extended. SOLUTION: This metallic mold is provided with an insert mold having the product-shaped part and arranging a cooling water passage for insert mold in the inner part, a main mold body fittably/removably inserting this insert mold and arranging a cooling water passage for main mold body in the inner part, a temperature sensor for insert mold measuring the temperature of the insert mold, and a temperature sensor for main mold body measuring the temperature of the main mold body.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a casting die used for die casting, one in which only the minimum necessary portion can be replaced when the design portion is worn is disclosed in Japanese Patent Laid-Open No. 8-174147. It is publicly known.

[0003]

By the way, the casting mold as described above has many fine irregularities and is severely damaged.
In addition, a product shape portion that defines a product cavity is a portion that requires fine temperature control. However, in the above-mentioned Japanese Patent Laid-Open No. 8-174147, it is difficult to finely control the temperature of the product-shaped portion, so that there is a problem that the life of the product-shaped portion is shortened due to thermal fatigue. The present invention has been made in view of the above problems,
To provide a casting mold capable of reducing the thermal fatigue of the product shape part by controlling the temperature of the product shape part and the other parts separately, thereby extending the life of the product shape part. The purpose is to

[0004]

In order to achieve the above-mentioned object, a casting mold according to the present invention comprises a nesting mold having a product shape portion and having a cooling water passage for the nesting mold therein, and the nesting mold. For the mold body that is detachably fitted and has a cooling water passage for the mold body inside, a temperature sensor for the nest mold that measures the temperature of the nest mold, and a mold body that measures the temperature of the mold body And a temperature sensor.

The casting mold of the present invention is characterized in that the mold body is attached to a die base equipped with a product extruding mechanism.

Further, the casting mold of the present invention is characterized in that the nesting mold and the mold body are made of a copper alloy material.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 3, in the center of the mold bodies 3 and 4 in which the cooling water passages 1 and 2 for the mold body are provided, the product-shaped portion is provided and the cooling water passages 5 and 6 for the nesting mold are provided inside The nesting molds 7 and 8 are detachably fitted. A plug not shown is screwed into the open ends 32 and 33 of the mold body cooling water passages 1 and 2.

Die bases 11 and 12 equipped with product pushing mechanisms 9 and 10 are attached to the back surfaces of the mold bodies 3 and 4, and the die base 12 is opened and closed when the mold is opened and closed. The die base 11 is fixed and movable. The die bodies 3 and 4 and the nesting dies 7 and 8 are made of a copper alloy material having excellent thermal conductivity, and the die bases 11 and 12 are made of an iron-based material.

Further, the cooling water passages 5 and 6 for the nest type are
A block body 13 fixed to the back surfaces of the mold bodies 3 and 4,
14 is communicated with the inside of the block bodies 13 and 14 through the pipes 15 and 16, and the die bases 11 and 1 are connected to each other.
It is connected to the cooling water discharge holes 17 and 18 for the telescopic type formed in 2. In addition, the die bases 11 and 12 are provided with nesting type cooling water supply holes 19 and 20, respectively.
The cooling water supply holes 19 and 20 are connected to the nested cooling water passages 5 and 6 through pipes 21 and 22, respectively.

Further, the die bases 11 and 12 have cooling water supply holes 23 and 24 and cooling water discharge holes 25 for the mold body.
The cooling water supply holes 23, 24 and the cooling water discharge holes 25, 26 are communicated with the mold body cooling water passages 1, 2, respectively.

Nesting thermocouples 27 and 28 as temperature sensors for nesting molds for measuring the temperature of the nesting molds 7 and 8 are attached to the mold bodies 3 and 4, respectively. The tips of 27 and 28 are inserted inside the nesting dies 7 and 8. Further, mold body thermocouples 29 and 30 as mold body temperature sensors for measuring the temperature of the mold bodies 3 and 4 are attached to the mold bodies 3 and 4,
The tips of the mold body thermocouples 29 and 30 are inserted into the mold bodies 3 and 4. Reference numeral 31 in the drawing is a casting plan section.

After the mold is opened, the mold constructed as described above is molded by a gas burner device (not shown).
The surfaces (cavity side) of 4 and the nesting dies 7 and 8 are heated. The temperatures of the mold bodies 3 and 4 and the nesting molds 7 and 8 are the thermocouples 27 and 28 for nesting molds and the thermocouples 29 and 3 for mold bodies.
0 is constantly measured, and when these have reached a desired temperature, the gas burner device is retracted, the mold is closed, and then casting is performed from the casting plan unit 31.

Next, the cooling water is made to flow from the cooling water supply holes 19 and 20 to the insert mold cooling water passages 5 and 6, and the mold body cooling water passages 1 and 2 are made from the cooling water supply holes 23 and 24.
After cooling the product by pouring cooling water to it, the mold is opened. Then, after separating the product from the mold bodies 3 and 4 and the nesting molds 7 and 8 by the product extruding mechanisms 9 and 10, the product is taken out.

When the casting operation as described above is repeatedly performed, the temperature of the nesting dies 7 and 8 having the product shape portion is gradually increased in proportion to the number of times the casting operation is repeated, which causes thermal fatigue. Fierce. However, in the present invention, the temperatures of the nesting dies 7 and 8 and the mold bodies 3 and 4 are measured separately, and the timing of supplying the cooling water is changed or the cooling water is supplied separately based on the measured temperature. Since the length of the flowing time can be changed, the temperature of the nesting molds 7 and 8 can be finely controlled.

For example, in the nesting dies 7 and 8 which are severely thermally fatigued, the casting operation is performed by making the cooling water flow longer than the die bodies 3 and 4, or by making the timing of supplying the cooling water earlier. It is possible to prevent the temperature rise of the nesting dies 7 and 8 due to the repetition of the above. Therefore, it is possible to reduce the thermal fatigue of the nesting dies 7 and 8 having the product shape portion and to extend the life of the product shape portion.

Further, according to the present invention, when the nesting dies 7 and 8 are damaged, the nesting dies 7 and 8 can be easily removed from the die bodies 3 and 4, and the other nesting dies 7 and 8 prepared in advance can be used for a short time. Needless to say, they can be exchanged at.

In the embodiment of the present invention, the surfaces of the mold bodies 3 and 4 and the nest molds 7 and 8 are heated by a gas burner device (not shown), but the invention is not limited to this. You may make it heat with a heater etc.

[0018]

As is apparent from the above description, the present invention has a nesting type having a product shape portion and having a cooling water passage for the nesting type therein, and the nesting type is detachably fitted. A mold body having a mold body cooling water passage provided therein, a temperature sensor for nesting mold for measuring the temperature of the nesting mold, and a temperature sensor for mold body for measuring temperature of the mold body. Therefore, various effects such as controlling the temperature of the product shape part and the other parts separately to reduce the thermal fatigue of the product shape part and thereby extending the life of the product shape part can be achieved. There is.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view showing an embodiment of the present invention.

FIG. 2 is a view on arrow AA in FIG.

3 is a BB arrow view (partially cutaway) in FIG. 2. FIG.

[Explanation of symbols]

Cooling water passage for 12 type body 3 4 type body 5 6 Nesting type cooling water passage 7 8 Nested 9 10 Product extrusion mechanism 11 12 dai base 27 28 Nesting type temperature sensor 29 30 type body temperature sensor

Claims (3)

[Claims] 1. A nesting die having a product shape portion and having a cooling water passage for a nesting die therein, and a die having the nesting die detachably fitted therein and having a cooling water passage for a die body inside. A mold for casting, comprising: a main body, a temperature sensor for a nesting die that measures a temperature of the nesting die, and a temperature sensor for a die body that measures a temperature of the die body. 2. The casting mold according to claim 1, wherein the mold body is attached to a die base equipped with a product extruding mechanism. 3. The casting mold according to claim 1, wherein the insert mold and the mold body are made of a copper alloy material.