KR20140016321A - Die-casting die - Google Patents

Abstract

The present invention is a die cast mold for molding a die cast product by injecting molten metal into the cavity. The die cast mold of the present invention has a fixed mold, a movable mold which is capable of being close to half with respect to the fixed mold, and forms a cavity in the joining surface thereof together with the fixed mold, and an overflow gate in the cavity on at least one of the fixed mold and the movable mold. Overflow formed to communicate with each other; and a porous gas passage member provided on at least one of the fixed type and the movable type so as to be in contact with the overflow, and through which the gas can pass without passing molten metal during the overflow; It has an exhaust passage in which one end thereof communicates with the surface on the opposite side to the other side, and the other end thereof communicates with the outside of the fixed type or the movable type.

Description

Die-casting mold {DIE-CASTING DIE}

The present invention relates to a die cast die used for die cast casting such as aluminum.

Conventionally, as a metal mold | die which considered gas discharge | emission, the metal mold | die (refer patent document 1: Unexamined-Japanese-Patent No. 58-47538 etc.) which discharges gas using a porous material is known.

In the metal mold | die of patent document 1, a porous material is made to bury gas in the whole surface of the cavity which forms a product, or the part which the gas is most likely to generate | occur | produce, or gas tends to be filled.

Patent Document 1: Japanese Patent Application Laid-open No. 58-47538

However, when a porous material is used for gas discharge, for example, in aluminum die-cast casting, there is a problem that clogging occurs in the porous material at about 10 shots, so that the gas cannot be discharged.

This invention is made | formed in order to solve the above-mentioned problem, and it aims at providing the die-cast die which can obtain the stable and high quality die-cast molded article by drastically reducing the clogging of the porous gas passage member, and improving durability. Doing.

In order to achieve the above object, the present invention is a die-casting mold which presses molten metal into a cavity to cast a die-cast product, which is capable of being close to and separated from the stationary mold, and together with the stationary mold, At least one of the movable mold to be formed, the fixed mold and the movable mold, the overflow formed to communicate with the cavity via an overflow gate, and the fixed mold and the movable mold to be connected to the overflow, The porous gas passage member through which gas can pass without passing through the molten metal, and one end thereof communicates with a surface on the side opposite to the overflow of the gas passage member, and the other end communicates with the outside of the fixed or movable type. It has an exhaust path.

In this invention comprised in this way, since the porous gas passage member which allows a gas to pass through is provided without contacting a molten metal so that it may contact the overflow formed in at least one of a fixed type | mold and a movable type | mold, this gas passage member will provide And the molten metal are separated, and only gas is exhausted to the outside through the gas passage member, thereby preventing gas defects. In addition, since the molten metal is cooled until it reaches the overflow, the viscosity is increased, the clogging of the gas passage member provided in the overflow is reduced, and the durability of the gas passage member is greatly improved. As a result, according to the die cast metal mold | die of this invention, the stable high quality die cast molded article can be obtained.

In the present invention, the gas passage member preferably has a surface flow path area in contact with the molten metal, and the flow path area is set so that the average flow velocity of the gas flowing through the gas passage member is 0.2 to 1.0 m / sec.

In the present invention, the gas passage member preferably has a surface area flow path area in contact with the molten metal, and the flow path area is set so that the average flow velocity of the gas flowing through the gas passage member is 0.05 to 0.2 m / sec. And an air vent mechanism provided to communicate with the overflow and exhaust the gas directly to the outside without passing through the gas passage member.

In the present invention, the gas passage member preferably includes a fiber-reinforced metal composite material or a metal powder sintered body.

In the present invention, the average pore diameter is preferably 3 to 30 µm.

In the present invention, preferably, a plurality of gas passage members are provided.

In the present invention, preferably, at least one exhaust passage is formed with respect to the gas passage member.

The present invention is also preferably provided with at least one extrusion pin for releasing the die cast product in the overflow.

In the present invention, the molten metal is preferably an aluminum alloy.

1 is a plan view illustrating a die cast mold according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.
3 is a cross-sectional view taken along line III-III of FIG. 1.
4 is a plan view showing a die cast molded product molded into a die cast mold according to an embodiment of the present invention.
5 is a front sectional view showing a die cast die according to a modification of one embodiment of the present invention.
6 is a front sectional view showing a die cast die according to another modification of one embodiment of the present invention.

Hereinafter, with reference to FIGS. 1-4, the die-cast die by one Embodiment of this invention is demonstrated. 1 is a plan view illustrating a die cast mold according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along a line II-II of FIG. 1, and FIG. 3 is a cross-sectional view taken along a line III-III of FIG. 1. 4 is a plan view showing a die cast molded product molded into a die cast mold according to an embodiment of the present invention.

As shown in FIGS. 1-3, the die-casting die 1 by embodiment of this invention is comprised by the stationary die 2 and the movable die 4. As shown in FIG. On the joining surface of these stationary mold 2 and movable mold 4, the cavity 6 which becomes a product shape, and the runner 8 which is a channel | path which flows molten metal (henceforth "mold") to this cavity 6 are called. ) And an overflow 10 for deriving a preliminary molten metal, gas, or the like pressed into the cavity 6 is formed. Here, the runner 8 communicates with the cavity 6 via the gate 12 which is an inflow port for filling the cavity 6 from the runner 8 with the molten metal. The cavity 6 communicates with the overflow 10 via an overflow gate 14, which is a passage through which the molten metal connecting the cavity 6 and the overflow 10 flows.

In addition, a substantially cylindrical injection sleeve 16 is provided in the stationary die 2 so as to communicate with the runner 8. The injection sleeve 16 has a pouring hole 18 into which molten metal is injected, and the plunger 20 is fitted in the inner cylinder 16a of the injection sleeve 16 so as to be slidable. The molten metal is press-fitted into the runner 8 by this injection sleeve 16.

On the other hand, the recessed part 22 is formed in the movable die 4 so that the overflow 10 may be enclosed, and the porous gas passage member 24 is embedded in this recessed part 22. In the die-casting die 1 according to the present embodiment, as shown in FIG. 1, three overflows 10a, 10b, and 10c are formed, and each overflow 10a, 10b, and 10c is provided. The gas passage member 24 is disposed. In addition, a fiber reinforced metal composite material or a metal powder sintered compact is used for the gas passage member 24. Further, the movable die 4 has an exhaust passage in which one end thereof communicates with the surface on the side opposite to the overflow 10 of the gas passage member 24, and the other end thereof communicates with the outside of the movable die 4 ( 26) is perforated. In addition, at least one exhaust path 26 is formed with respect to the gas passage member 24.

Moreover, the extrusion pin 28 for releasing the die-cast molded article 30 (refer FIG. 4) from the movable die 4 is penetrated to the movable die 4 so that a sliding movement is possible.

Next, the shaping | molding method of the die-cast molded article 30 by the die-cast die 1 by embodiment of this invention mentioned above is demonstrated. First, the movable die 4 is moved by a die casting machine (not shown), and the movable die 4 is fastened and fixed to the stationary die 2 in combination with the stationary die 2. Thereafter, the molten metal injected from the pouring hole 18 of the injection sleeve 16 is press-fitted into the die-casting die 1 composed of the stationary die 2 and the movable die 4 by the plunger 20. The press-molded melt flows through the runner 8, passes through the gate 12, and flows into the cavity 6.

The molten metal extruded from the cavity 6 flows out to the overflow 10 via the overflow gate 14. Since the gas passage member 24 is embedded in the overflow 10, the gas generated during molding is transferred from the exhaust path 26 through the gas passage member 24 to the die cast mold 1 (fixed mold 2). And the movable mold 4]. Subsequently, when the molten metal is cooled and solidified, the movable die 2 is spaced apart from the stationary die 4 by a die casting machine (not shown), and the die cast die 1 (the stationary die 2 and the movable die 4). ] Is opened. And the die cast molded product 30 is extruded by the extrusion pin 28 penetrated by the movable die 4, and it releases from the movable die 4.

Next, the gas flow rate through the gas passage member 8 will be described. In the die-casting die 1 according to the embodiment of the present invention, the average gas flow rate through which the gas passage member 24 passes through the pores is set to be in a range of 0.2 to 1.0 m / sec. For this reason, when determining the capacity of the overflow 10, the gas passage member 24 is in the overflow 10 so that the average gas flow rate passing through the pores of the gas passage member 24 is 0.2 to 1.0 m / sec. The surface area of the flow path in contact with the molten metal is set. Therefore, in the die-casting die 1 according to the embodiment of the present invention, three overflows 10a, 10b, and 10c are formed to surround each of the overflows 10a, 10b, and 10c. The gas passage member 8 is provided.

However, when the flow path area at which the average flow velocity of the gas flowing through the gas passage member 24 is 0.2 to 1.0 m / sec can be ensured, the gas passage member 24 overflows 10 as described above. The gas passage member 24 may be provided so as to be in contact with only a part of the area of one side of the overflow 10 because it is not necessary to be installed so as to be in contact with the entire surface of one side of the top surface.

Here, when the average gas flow rate exceeds 1.0 m / sec, the gas discharge pressure loss becomes large, and a sufficient gas discharge effect is not obtained. In addition, if the average gas flow rate passing through the pores of the gas passage member 24 is reduced, a gas discharge effect is obtained. The capacity of (10) is increased, resulting in poor yield. Therefore, less than 0.2 m / sec is not economical.

In the die-casting die 1 according to the embodiment of the present invention, as shown in Figs. 1 to 3, and, if necessary, the overflow 10 is an air vent mechanism 32 that is an auxiliary gas discharge mechanism. ) May be installed. By providing this air vent mechanism 32, the flow path area whose average gas flow rate through the pores of the gas passage member 24 is 0.05 to 0.2 m / sec without increasing the capacity of the overflow 10 more than necessary. It becomes possible to make it. Moreover, even when the air vent mechanism 32 is provided in the overflow 10, you may make the flow path area which the average gas flow rate which passes through the pore of the gas passage member 24 becomes 0.2-1.0 m / sec.

In addition, in the die cast mold 1 according to the embodiment of the present invention, the pore diameter of the gas passage member 24 is 3 to 30 µm, but preferably 3 to 20 µm. If the pore diameter of the gas passage member 24 is too small, the resistive pressure loss of the gas discharge becomes high, and clogging due to the melt is reduced, but the effect of the gas discharge decreases. On the other hand, when the pore diameter is too large, the effect of gas discharge is great, but clogging due to molten metal occurs in a short time, and durability is lowered.

In addition, in the die-casting die 1 according to the embodiment of the present invention, since the release agent is injected into the gas passage member 24, it causes clogging, and thus the overflow 10 in which the gas passage member 24 is embedded is embedded. The use of a release agent in) is not preferred. Since it is necessary to avoid the use of a mold release agent to the overflow 10, in the die-cast die 1, it is preferable to provide one or more extrusion pins 28 for mold release to the overflow 10 as well.

Next, with reference to FIG. 5 and FIG. 6, the modified example of embodiment of this invention is demonstrated. FIG. 5 is a front sectional view showing a die cast mold according to a modification of one embodiment of the present invention, and FIG. 6 is a front sectional view showing a die cast mold according to another modification of one embodiment of the present invention.

As shown in FIG. 5, in the modification of the embodiment of the present invention, the gas passage member 24 and the exhaust passage 26 are formed only in the stationary die 2, not the movable die 4.

In addition, as shown in FIG. 6, in another modification of the embodiment of the present invention, the gas passage member 24 and the exhaust passage 26 are formed on both the stationary mold 2 and the movable mold 4. Doing.

[Example]

Next, the example which die-casted using the die-cast die which concerns on the Example of this invention is shown.

Example 1

In the die-cast die of Example 1 of the present invention, the total cross-sectional area of the die temperature of 190 ° C, the melt temperature at the time of injection, 690 ° C, and the gate 12 is 0.4 cm 2, and the cross-sectional area of the overflow gate 14 is 0.4 cm 2. And injection speed was 0.5 m / sec.

In the gas passage member (porous breathable metal) 24, about 30% of the porosity, using a Shinto Kogyo Co., Ltd. II having a porosity of approximately 25% and an average pore diameter of 7 µm, is approximately 30 cm 2. It was buried so as to have a flow path area. As mentioned above, this flow path area is a surface area which the gas passage member 24 contacts with the molten metal which flowed into the overflow 10. This flow path area is the same also about Example 2-5. In this case, the average velocity of the gas passing through the gas passage member 24 is approximately 1.0 m / sec.

In Example 1, as a result, even when 1000 shots or more were molded, no clogging was observed, and the amount of gas contained in the die cast molded product 30 was approximately 10 kV / 100 g-AL.

[Example 2]

The molding conditions of Example 1 were the same as that of Example 1, and the cross-sectional area of the mold gate temperature 190 degreeC, the melt temperature at the time of injection | pouring 690 degreeC, the total cross-sectional area of the gate 12 is 0.4 cm <2>, and the overflow gate 14 is 0.4 cm <2>. The injection speed was 0.5 m / sec.

In the gas passage member (porous breathable metal) 24, a flow path of approximately 100 cm 2 was used in the concave portion of the overflow 10 by using Shinto Kogyo Co., Ltd. II having a porosity of approximately 25% and an average pore diameter of 7 µm. Landfill was made so as to have an area. In this case, the average speed of the gas passing through the gas passage member 24 is approximately 0.3 m / sec.

Also in Example 2, even if it molded by 1000 shots or more as a result, the state of clogging was not observed, and the gas amount contained in the die-cast molded article 30 was about 4 kL / 100 g-AL.

[Example 3]

Molding conditions of Example 3 were also the same as in Example 1.

In the gas passage member (porous breathable metal) 24, approximately 30% of porosity and Shinto Kogyo Co., Ltd. II having an average pore diameter of 20 µm were used, and approximately 100 in the recess 22 of the overflow 10. It was embedded so as to have a channel area of 2 cm 2. In this case, the average velocity of the gas passing through the gas passage member 24 is approximately 0.2 m / sec.

Also in Example 3, even if it shape | molded 1000 shots or more as a result, the state of clogging was not observed, and the amount of gas contained in the die-cast molded article 30 was about 2 Pa / 100g-AL.

Example 4

Molding conditions of Example 4 were also the same as in Example 1.

In the gas passage member (porous breathable metal) 24, approximately 100% of porosity and 30 pore diameter of Shinto Kogyo Co., Ltd. II having an average pore diameter of about 100 are used, and approximately 100 in the recess 22 of the overflow 10. It was embedded so as to have a flow path area of 2 cm 2. In this case, the average velocity of the gas passing through the gas passage member 24 is approximately 0.2 m / sec.

Also in Example 4, as a result, clogging tendency began to occur at about 1000 shots, but the amount of gas contained in the die-cast molded article 30 was approximately 2 Pa / 100 g-AL.

The porous breathable metal after 1000 shots was also washed with alkali, subjected to breathing recovery, and embedded in the mold again, but could be used.

[Example 5]

Molding conditions of Example 5 were also the same as in Example 1.

In the gas passage member (porous breathable metal) 24, a flow path of approximately 100 cm 2 was used in the concave portion of the overflow 10 by using Shinto Kogyo Co., Ltd. II having a porosity of approximately 25% and an average pore diameter of 3 µm. Buried in the area. In this case, the average velocity of the gas passing through the porous breathable metal is approximately 0.3 m / sec.

Also in Example 5, even if it molded by 1000 shots or more as a result, the state of clogging was not observed, and the amount of gas contained in the die-cast molded article 30 was about 7 Pa / 100g-AL.

[Comparative Example]

Molding conditions of the comparative example were also the same as in Example 1.

A gas passage member having a porosity of approximately 25% and an average pore diameter of 7 µm was embedded in the cavity 6 so as to have an area of approximately 100 cm 2.

In the comparative example, clogging occurred in approximately 10 shots as a result, and a normal die cast molded article was not obtained.

As described above, in the aluminum die-cast casting, when the die-cast die 1 according to the embodiment of the present invention is used, the molten metal is filled in the cavity 6 and then passed through the overflow gate 14. The flow 10 is filled. At this time, the molten metal pressed at the initial injection temperature of 650 ° C. or higher is estimated to cool to 600 ° C. or lower when passing through the overflow gate 14, and the viscosity of the molten metal rises by this cooling, resulting in overflow 10. The clogging of the pores of the gas passage member 24 used in the step was greatly reduced. This improves the durability of the gas passage member 24. As a result, according to the die-casting die 1 according to the embodiment of the present invention, it becomes possible to obtain a stable, high-quality die-cast molded article 30.

1: diecast mold
2: fixed type
4: movable type
6: cavity
8: runner
10: overflow
12: gate
14: overflow gate
16: injection sleeve
18: pouring spout
20: plunger
22:
24: gas passage member
26: exhaust passage
28: extrusion pin
30: die cast moldings
32: air vent mechanism

Claims (9)

Die-casting mold for casting die-cast products by injecting molten metal into the cavity,
Fixed type,
A movable mold which is capable of being close to half with respect to the fixed mold and which forms a cavity in their joint surface together with the fixed mold;
An overflow formed in at least one of the fixed type and the movable type to communicate with the cavity via an overflow gate;
A porous gas passage member provided on at least one of the fixed type and the movable type so as to be in contact with the overflow, and capable of passing gas without passing molten metal in the overflow;
An exhaust gas in which one end thereof communicates with a surface on the side opposite to the overflow of the gas passage member, and the other end thereof communicates with the outside of the fixed or movable type,
Die casting mold, characterized in that having a. The method of claim 1,
The said gas passage member has a surface area flow path area which contact | connects a molten metal, and this flow path area is set so that the average flow velocity of the gas which flows through a gas passage member may be 0.2-1.0 m / sec. The method of claim 1,
The gas passage member has a surface area flow path area in contact with the molten metal, and the flow path area is set so that the average flow velocity of the gas flowing through the gas passage member is 0.05 to 0.2 m / sec, and also communicates with the overflow. A die cast mold having an air vent mechanism that is installed to exhaust the gas directly to the outside without passing through the gas passage member. The method of claim 1,
The said gas passage member is a die cast metal mold | die containing a fiber reinforced metal composite material or a metal powder sintered compact. 5. The method according to any one of claims 1 to 4,
The said gas passage member is a die cast die whose average pore diameter is 3-30 micrometers. 5. The method according to any one of claims 1 to 4,
A die casting die, wherein a plurality of gas passage members are provided. 5. The method according to any one of claims 1 to 4,
At least one exhaust path is formed in the die-cast die according to the gas passage member. 5. The method according to any one of claims 1 to 4,
Moreover, the die casting die in which the said overflow is provided with at least 1 extrusion pin for releasing the said die cast product from the said stationary type and movable type. 5. The method according to any one of claims 1 to 4,
The die cast mold, wherein the molten metal is an aluminum alloy.

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