JP2000301311A - Molten metal injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably supply molten metal in a clean state by the necessary amount. SOLUTION: A melting furnace 14 for melting metallic material and an injection sleeve 7 provided with an injection tip 4 reciprocatively moved in almost the perpendicular direction, are provided. A first molten metal holding part 20 at the front part of the injection tip 4 of this injection sleeve 7 is communicated with the melting furnace 14 through an opening/closing valve 9 and a second molten metal holding part 28 at the rear part of the injection tip 4 in the injection sleeve 7 is communicated with the melting furnace 14 and the front end part 21 of the first molten metal holding part 20 can be communicated with a metallic mold 40. Molten metal passages 23, 24, 25, 26, 27 communicated with the first molten metal holding part 20, the second molten metal holding part 28, and between these parts and the melting furnace 14, are heated so that the metallic material can be held to the molten state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal injection apparatus for producing a metal product from a molten metal.

[0002]

2. Description of the Related Art As a method of forming a metal product using a molten metal, generally, a molten metal is poured into a sleeve of an injection device.
There are two types, a cold chamber system in which the molten metal is filled in the mold before solidification, and a hot chamber system in which the chamber itself is immersed in the molten metal and the molten metal is filled in the mold by an injection device.

In the case of the cold chamber system, a certain amount of capacity is required at the gate so that solidified pieces of metal generated in the injection sleeve do not enter into the metal product, so that extra metal material is required accordingly. There was a problem. There is also a problem that a high melt temperature must be set in consideration of the melt temperature in the sleeve, and a large amount of melting energy is required to melt the metal to form the melt.

[0004] The hot chamber method has the advantage that the temperature of the molten metal is less reduced, but the gas in the molten metal passage between the metal and the chamber is injected while being shot every shot, so that the quality of the molten metal is reduced.

[0005] In recent years, a molding method has been put to practical use in which a granular metal material is kneaded and melted with a screw, and then stored in a front portion of a cylinder and injected. As a prior art, Japanese Patent Laid-Open No. 9-1
Japanese Patent Application Laid-Open No. 55526 discloses a method of separating an injection from a screw, which is one example.

[0006]

However, since the prior art uses a granular metal material, the energy required to produce the granular metal material from the second material such as an ingot or a sprue is required, so that a total There is a problem that requires a lot of energy. In addition, the metal material stored at the tip of the injection piston is in a molten state or a semi-molten state, and complete sealing is impossible even if any backflow prevention mechanism is provided. There is a problem that an abnormality occurs or the molten metal overflows.

The present invention has solved the above-mentioned problems, and provides a molten metal injection apparatus capable of stably supplying a required amount of a molten metal in a clean state.

[0008]

Means for Solving the Problems In order to solve the above technical problems, the technical means (hereinafter referred to as first technical means) taken in claim 1 of the present invention dissolves a metal material. A melting furnace, and an injection sleeve provided with an injection tip capable of reciprocating in a substantially vertical direction, wherein a first molten metal holding portion in front of the injection tip of the injection sleeve communicates with the melting furnace through an on-off valve, A second molten metal holding part behind the injection tip of the injection sleeve communicates with the melting furnace, and a tip end of the first molten metal holding part can communicate with a mold. The first molten metal holding part and the second molten metal holding part The molten metal injection device is characterized in that the molten metal passage and the molten metal passage communicating with the melting furnace are heated so as to maintain the metal material in a molten state.

The effects of the first technical means are as follows.

That is, since the second molten metal holding portion is provided behind the injection tip and the second molten metal holding portion is in communication with the melting furnace, it is not necessary to completely prevent backflow, so that the inside of the injection sleeve is not required. The molten metal can be kept in a completely molten state, there is no metal solidified in this part, and when the mold is opened, if there is metal solidified enough to prevent the molten metal from flowing out The amount of solidified material in the molten metal to be injected can be reduced. Thereby, the required amount of the molten metal can be stably supplied in a clean state.

[0011] In order to solve the above technical problem, a technical means (hereinafter referred to as a second technical means) taken in claim 2 of the present invention is to inject molten metal into the cavity of the mold. The molten metal injection device according to claim 1, wherein a mouthpiece for performing the injection is provided on the mold.

The effects of the second technical means are as follows.

That is, since the molten metal can be solidified at the tip of the mouthpiece, the molten metal does not flow out even when the mold is opened, and the volume of the solidified metal solidified from the molten metal can be extremely reduced.

[0014] In order to solve the above technical problem, a technical means (hereinafter referred to as a third technical means) taken in claim 3 of the present invention is to inject molten metal into the cavity of the mold. The metal melt injection device according to claim 1, wherein a mouthpiece for performing the operation is provided at a tip end of the first molten metal holding portion.

The effects of the third technical means are as follows.

That is, similarly to the second aspect, the molten metal can be solidified at the tip end of the mouthpiece, so that the molten metal does not flow out even when the mold is opened, and the volume of the solidified metal solidified from the molten metal is extremely reduced. Can be smaller.

In order to solve the above technical problem, the technical means (hereinafter referred to as fourth technical means) taken in claim 4 of the present invention is provided in the cavity of the mold.
2. The molten metal injection device according to claim 1, wherein a capturing space for capturing solidified metal is provided.

The effects of the fourth technical means are as follows.

That is, when the molten metal is injected, the solidified metal at the tip of the mouthpiece is first captured in the capturing space, and the solidified metal can be prevented from entering the product portion of the cavity. Can be supplied in a state
Produce high quality products.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of a molten metal injection apparatus showing an embodiment of the present invention. The metal is not particularly limited, and can be applied to metals such as aluminum, magnesium, and zinc.

The configuration of the present embodiment will be described. The molten metal injection device includes a melting furnace 14, an injection unit 30, and a mold 4.
0. In the melting furnace 14, a molten metal 31 obtained by melting a metal material by a heating device 15 is held in a molten state. The melting furnace 14 has a molten metal surface 31a.
A molten metal passage 32 provided at a lower position is provided.

The injection section 30 comprises an injection sleeve 7, an injection tip 4, an injection rod 3, a coupling 2, and an injection drive section 1. Inside the injection sleeve 7, a backflow prevention mechanism 6 for preventing backflow of the molten metal around its outer periphery is provided.
Is provided. The injection tip 4 is connected to the injection drive unit 1 via an injection rod 3 and a coupling 2 installed coaxially, and is capable of reciprocating vertically. In this embodiment, the injection tip 4 is capable of reciprocating in the vertical direction. However, the injection tip 4 may not be completely vertical but may be inclined from the vertical direction as long as the function is not impaired.

The injection sleeve 7 is provided with heating devices 29, 34
Thus, the molten metal is maintained in a molten state in both the first molten metal holding portion 20 in front of the injection tip 4 and the second molten metal holding portion 28 in the rear of the injection tip 4.

The first molten metal holding section 20 includes a molten metal passage 2
It communicates with the molten metal passage 32 provided in the melting furnace 14 via 3, 24, 25, 26. An on-off valve 9 for opening and closing the flow of the molten metal between the melting furnace 14 and the first molten metal holding part 20 is provided between the molten metal passages 24 and 25. The molten metal passages 23, 24, 25, 26 and the on-off valve 9
It is heated by 2, 29 and 35 and is maintained at a temperature at which the molten metal can flow. The on-off valve 9 is provided with a valve element 11, which is connected to a valve element driving unit 10,
It is opened and closed by this valve drive unit 10. On the other hand, the second molten metal holding portion 28 is in communication with the molten metal passage 32 provided in the melting furnace 14 via the molten metal passages 27 and 26. The height of the molten metal surface 28 a of the second molten metal holding part 28 is kept the same as the height of the molten metal surface 31 a of the melting furnace 14. Molten metal passage 27
Is heated by the heating device 29 and is maintained at a temperature at which the molten metal can flow. The height of the injection sleeve 7 is
Since the height is set higher than the height of the molten metal 8a, the injection sleeve 7 has a space above the molten metal surface 28a of the second molten metal holding part 28. A cover 5 for preventing the overflow of the molten metal in the second molten metal holding section 28 is provided on an upper portion of the injection sleeve 7.

The mold 40 includes a fixed mold 17 and a movable mold 18.
It is composed of The first molten metal holding part 20 can be connected to the mold 40 at the tip part 21 thereof. In the case of the present embodiment, the fixed die 17 is connected to and fixed to the distal end portion 21. When the fixed mold 17 and the movable mold 18 come into contact with each other, a cavity 19 is formed between them. In the fixed mold 17,
A mouthpiece 16 having a molten metal passage 22 for flowing molten metal into the cavity 19 is provided. The cavity 19 is provided with a capturing space 33 for capturing the solidified metal present at the tip 21. In the present embodiment, the mouthpiece 16 has an integral structure with the fixed mold 17, but may have an integral structure with the injection sleeve 7.

The operation of this embodiment will be described. The injection tip 4 is at the upper end, the on-off valve 9 is open,
The mold 40 is also in an open state in which the movable mold 18 is opened, and the state where the first molten metal holding portion 20, the second molten metal holding portion 28, and the molten metal passage 22 in the mouthpiece 16 are filled with the molten metal is set as the original position. . At the tip of the mouthpiece 16, the molten metal partially solidifies due to the temperature control of the mouthpiece 16 and the escape of heat to the fixed mold 17 to form a solidified metal, so that the molten metal does not flow out.

The movable mold 18 comes into contact with the fixed mold 17 and
When 0 is closed and the injection is ready, the on-off valve 9 is closed and the flow of the molten metal between the first molten metal holding unit 20 and the melting furnace 14 is shut off. Thereafter, the injection driving unit 1 advances by a hydraulic source (not shown), and the injection tip 4 connected to the injection driving unit 1 also advances.

With this force, the solidified metal at the tip of the mouthpiece 16 is blown to the trapping space 33 in the cavity 19, and a passage for discharging the molten metal is formed at the tip of the mouthpiece 16, so that the cavity 19 is filled with the molten metal. I do. The solidified metal that has been blown into the cavity 19 is filled in the trapping space 33.
The product quality is stable because it does not enter the product department.

After the cavity 19 is filled with the molten metal, the molten metal is supplied by the injection power of the injection driving unit 1 to several hundred kg / cm.
Pressurized to ^two or more pressures. At this time, the backflow prevention mechanism 6 prevents the backflow of the molten metal in the first molten metal holding section 20, but a slight backflow occurs. However, the molten metal that has flowed back flows into the second molten metal holding portion 28 provided behind the injection tip 4.
Therefore, the molten metal can be prevented from overflowing from the injection slave 7 to the outside.

The molten metal filled in the cavity portion 19 is deprived of heat by the mold 40 and solidified. The molten metal in the mouthpiece 16 also starts to solidify from the tip. The movable mold 18 is moved to open the mold 40 at a timing when this portion reaches a solidified layer thickness sufficient to prevent the outflow of the molten metal. Thereafter, the product is released from the fixed mold 17.

On the other hand, when the solidification of the molten metal in the cavity 19 is completed, the release valve 9 is opened, and then the injection tip 4 is retracted. Then, the molten metal is replenished through the molten metal passages 26, 25, 24, and 23 by an amount corresponding to the retreat of the injection tip 4, and the next injection operation becomes possible.

In the case of the molten metal, even if the backflow prevention mechanism 6 is provided in the injection tip 4, the backflow of the molten metal cannot be completely prevented. In the present invention, since the second molten metal holding portion 28 is provided behind the injection tip 4 and the second molten metal holding portion 28 communicates with the melting furnace 14, the backflow may not be completely prevented. As a result, the molten metal in the injection sleeve 7 can be maintained in a completely molten state, and no solidified metal exists in this portion. The amount of the solidified metal can be extremely reduced as compared with the prior art, since it is only necessary to prevent the molten metal from flowing out when the mold 40 is opened.

When the mouthpiece 16 is used as in the present embodiment, the molten metal can flow into the cavity 19 through the small-diameter molten metal passage 22. In this case, since only the tip of the small-diameter molten metal passage 22 needs to be solidified to prevent the molten metal from flowing out when the mold 40 is opened, the volume of the solidified metal is extremely small. Can be smaller.

Also, as in the present embodiment, the cavity 1
9 is provided with the capturing space 33, and when the molten metal is injected, the solidified metal can be captured in the capturing space 33 by the force of the molten metal. Excellent products can be manufactured.

As described above, according to the configuration of the present invention, the required amount of the molten metal can be stably supplied in a clean state. This makes it possible to manufacture a low-cost, high-quality metal product.

[0036]

As described above, the present invention has a melting furnace for melting a metal material and an injection sleeve provided with an injection tip capable of reciprocating in a substantially vertical direction. A first molten metal holding part communicates with the melting furnace through an on-off valve, and a second molten metal holding part behind the injection tip of the injection sleeve is provided.
A molten metal holding part communicates with the melting furnace, and a tip end of the first molten metal holding part can communicate with a mold. The first molten metal holding part, the second molten metal holding part, and a molten metal communicating these with the melting furnace. Since the passage is heated so that the metal material can be maintained in a molten state, the molten metal injection device can stably supply a required amount of the molten metal in a clean state.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a molten metal injection apparatus showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Injection chip 6 ... Backflow prevention mechanism 7 ... Injection sleeve 9 ... Open / close valve 12,29,34,35 ... Heating device 14 ... Melting furnace 16 ... Mouthpiece 17 ... Fixed type 18 ... Movable type 19 ... Cavity part 20 ... First 1 Molten metal holding part 21 ... Tip part 22, 23, 24, 25, 26, 27, 32 ... Molten metal passage 28 ... Second molten metal holding part 33 ... Capture space

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiro Hattori 2-1-1 Asahicho, Kariya City, Aichi Prefecture Inside Aisin Seiki Co., Ltd.

Claims (4)

[Claims] 1. A melting furnace for melting a metal material, and an injection sleeve provided with an injection tip capable of reciprocating in a substantially vertical direction, wherein a first molten metal holding portion in front of the injection tip of the injection sleeve functions as an on-off valve. A second molten metal holding portion behind the injection tip of the injection sleeve communicates with the melting furnace, and a tip end of the first molten metal holding portion can communicate with a mold through the injection sleeve. An apparatus for injecting molten metal, wherein the first molten metal holding section, the second molten metal holding section, and a molten metal passage communicating these with the melting furnace are heated so as to be able to maintain the metal material in a molten state. 2. The molten metal injection device according to claim 1, wherein a mouthpiece for injecting the molten metal into the cavity of the die is provided in the die. 3. The molten metal injection device according to claim 1, wherein a mouthpiece for injecting the molten metal into the cavity of the mold is provided at a tip end of the first molten metal holding portion. 4. The molten metal injection apparatus according to claim 1, wherein a cavity for capturing solidified metal is provided in the cavity of the mold.