JPH11226715A - Gas purging device for metallic mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas purging device for metallic mold, in which a large quantity of gas purging can be obtd. with a simple and inexpensive mechanism and such fear of trouble is scarcely developed as the intrusion of molten metal into this device and even it the molten metal intrudes into the device from happening, the maintenance is easily executed. SOLUTION: An inner pipe 1 is communicatively connected with a gas exhaust part B4 of chill blocks B1, B2 fitted to the metallic mold A and an outer pipe 2 is set concentrically to the outer periphery of the inner pipe 1 so that a gas exhaust hole 11 of the inner pipe is positioned at the inner deep part of the outer pipe. Then, gas is sucked from the gas exhaust part of the chill blocks through the inner pipe by injecting the air from the outer pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting method and the like, which positively discharges a gas component such as air or a combustion gas of a release agent remaining in a cavity after a mold is closed to the outside of the mold. The present invention relates to a degassing device for a mold for performing the above.

[0002]

2. Description of the Related Art Conventionally, various methods have been used to positively discharge gas components such as air staying in a cavity.
A mechanism has been proposed, and among them, a technique close to the present invention is a chill vent vacuum method. In this chill vent vacuum method, a pair of chill blocks having corrugated irregularities formed in a vent portion communicating with a pool portion of a cavity are mounted on a fixed type and a movable type in opposition to each other, and a vacuum device is provided in an exhaust port of the chill block. A large amount of gas can be released because the gas is connected to release the gas.However, there is a problem that the molten metal enters the vacuum device, and the timing when the molten metal is supplied to the cavity and the timing when the vacuum device is operated. There was a problem that it was difficult to match with.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. A large amount of gas can be vented by a simple and inexpensive mechanism, and molten metal infiltrates into the apparatus. It is an object of the present invention to provide a mold degassing device that has little risk of occurrence of troubles, such as the occurrence of trouble, and is easy to maintain even if molten metal enters.

[0004]

According to the present invention, there is provided a degassing apparatus for a mold in which an inner pipe is communicatively connected to an exhaust port of a chill block mounted on a mold, and the inner pipe is connected to an outer periphery of the inner pipe. The outer pipe is arranged concentrically and the exhaust port of the inner pipe is located inside the outer pipe, and air is blown out from the outer pipe, so that gas is discharged from the exhaust port of the chill block through the inner pipe. Is characterized by sucking. In this case, it is preferable that a connection pipe is attached to the exhaust port without directly connecting the inner pipe to the exhaust port of the chill block, and the inner pipe is detachably connected to the connection pipe. Further, the inner pipe and / or the connection pipe are:
It is preferable to use a material of the same quality as the molten metal used, that is, the metal supplied into the mold cavity.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. In the figure, A indicates a mold composed of a pair of fixed mold A1 and movable mold A2, B1 and B2 indicate a pair of chill blocks integrally mounted on mold A, and C indicates 1 shows a degassing device according to the present invention.

The pair of chill blocks B1 and B2 have substantially corrugated irregularities (chill vents) B3 formed at a vent portion communicating with a water pool portion A4 formed in a mold cavity A3, and a fixed mold A1 and a movable mold A2 are formed. Is mounted in an opposed manner. The exhaust ports B4 of the chill blocks B1 and B2
In addition, the degassing device C according to the present invention is connected in communication.

The degassing device C according to the present invention basically comprises one inner pipe 1 and one outer pipe 2, and the exhaust ports B of the chill blocks B1 and B2 mounted on the mold A.
4, an inner pipe 1 is connected to the outer pipe 2 and an outer pipe 2 is concentrically arranged on the outer periphery of the inner pipe 1 and an exhaust port 1 of the inner pipe 1 is provided.
1 is disposed so as to be located further inside than the exhaust port 21 of the outer pipe 2, and air is blown out from the exhaust port 21 of the outer pipe 2, so that the exhaust ports B 4 of the chill blocks B 1 and B 2 pass through the inner pipe 1. It is formed so as to suck gas from.

The inner pipe 1 and the outer pipe 2 are formed into a substantially cylindrical shape having an appropriate diameter and length, and the outer pipe 2 is coaxially integrated with the outer circumference of the inner pipe 1 at an appropriate interval. At the same time, it is arranged such that the exhaust port 11 of the inner pipe 1 is located sufficiently deeper than the exhaust port 21 of the outer pipe 2.
The other end opening (the side opposite to the exhaust port 11) 12 of the inner pipe 1 is connected to the exhaust port B4 of the chill blocks B1 and B2, and the other end opening of the outer pipe 2 (the side opposite to the exhaust port 21). At a position 22, a connection port 23 for connecting an air supply pipe (not shown) is formed.

At this time, (the other end opening 12 of the inner pipe 1)
Is not directly connected to the exhaust port B4 of the chill blocks B1 and B2, but the connecting pipe 3 is attached to the exhaust port B4 as shown in the illustrated embodiment, and the inner pipe 1 is connected to the connecting pipe 3.
(The other end opening 12) is preferably detachably connected. Then, even if the molten metal may enter the connection pipe 3 through the exhaust ports B4 of the chill blocks B1 and B2, there is almost no possibility that the molten metal will enter the inner pipe 1. .

The inner pipe 1 and / or the connecting pipe 3
May be formed of a commonly used metal material or the like, but is preferably formed of a material of the same quality as the molten metal used, that is, the molten metal for casting supplied to the cavity A3 of the mold A at that time. Then, even if the molten metal invades the connecting pipe 3 or the inner pipe 1 and clogging occurs, the molten metal is not particularly removed from the inside of the connecting pipe 3 or the inner pipe 1. It can be dissolved as it is and recycled.

The other end opening 12 of the inner pipe 1 is connected to the exhaust port B4 of the chill blocks B1 and B2 with or without the connection pipe 3 so that the outer pipe 2
An air supply pipe (not shown) is connected to the connection port 23 of the other end opening 22 of the outer pipe 2, and (strong) air flows from the other end opening 22 of the outer pipe 2 into the outer pipe 3 through the air supply pipe. The air is discharged from the exhaust port 21 of the outer pipe 2. Then, the inside of the inner pipe 1 has a negative pressure due to the diffuser effect. As a result, gas is sucked through the inner pipe 1 from the exhaust port B4 of the chill blocks B1 and B2,
The air is discharged to the outside together with the air from the exhaust port 11 of the inner pipe 1 through the exhaust port 21 of the outer pipe 2. Therefore, the force for sucking gas from the exhaust port B4 of the chill blocks B1 and B2 can be controlled by the flow rate of air flowing from the air supply pipe into the outer pipe 2.

[0012]

As described above, the gas venting device for a mold according to the present invention does not require a special valve conventionally used, and a large amount of gas can be vented by an extremely simple and inexpensive mechanism. In addition to this, no special maintenance is required, and maintenance and management become extremely easy.

Moreover, the suction force for extracting gas from the exhaust port of the chill block can be easily controlled by the flow rate of air flowing from the air supply pipe into the outer pipe.
There is almost no risk of the intrusion of molten metal into the equipment (the inside of the inner pipe or the outer pipe), and even if molten metal enters, there is no danger of clogging that would make gas release impossible. It will be easier.

Further, since the gas can be vented from the exhaust port of the chill block simply by flowing the air from the air supply pipe into the outer pipe, the air can be kept flowing from the air supply pipe into the outer pipe during use. Therefore, it is not necessary to consider the timing at which the molten metal is supplied to the cavity at all, and it is possible to reliably and effectively perform degassing.

According to the second aspect of the present invention, the connecting pipe is attached to the exhaust port of the chill block mounted on the mold, and the inner pipe is detachably connected to the connecting pipe. Therefore, even if the molten metal enters the connection pipe through the exhaust port of the chill block, there is almost no risk that the molten metal will enter the inside of the inner pipe. Even in the case of intrusion, it is possible to continue using the gas removal device as it is simply by replacing the connection pipe.

Further, according to the third aspect of the present invention, since the inner pipe and / or the connecting pipe are formed of the same material as the molten metal to be used, the molten metal is temporarily connected to the connecting pipe or the inner pipe. Even if clogging occurs due to infiltration into the inside, the molten metal can be melted as it is without being particularly removed from the inside of the connection pipe or the inner pipe and recycled.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

A: Mold A1: Fixed type A2: Movable type A3: Cavity A4: Pool part B1, B2: Chill block B3: Chill vent B4: Exhaust port C: This gas venting device 1: Internal pipe 11: Exhaust port 12: Others End opening 2: Outer pipe 21: Exhaust port 22: Other end opening 23: Connection port 3: Connection pipe

Claims (3)

[Claims] 1. An inner pipe is communicatively connected to an exhaust port of a chill block mounted on a mold, and an outer pipe is concentrically arranged on an outer periphery of the inner pipe, and an exhaust port of the inner pipe is provided inside the outer pipe. A gas venting device for a mold, wherein the gas is exhausted from an exhaust port of a chill block through the inner pipe by blowing air from the outer pipe. 2. The mold gas according to claim 1, wherein a connection pipe is attached to an exhaust port of the chill block mounted on the mold, and the inner pipe is detachably connected to the connection pipe. Punching device. 3. The internal pipe and / or the connecting pipe,
3. The degassing device for a mold according to claim 1, wherein the degassing device is formed of a material of the same quality as the molten metal used.