JP2000312965A - Method and device for dissolution separating biscuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate an aluminum material and a wire mesh of a biscuit without mixing an iron component or the like of the wire mesh with the aluminum material by dipping the biscuit in a molten aluminum of lower temperature than the melting point of the wire mesh, and pulling out the wire mesh from the molten aluminum after the aluminum is dissolved. SOLUTION: A wire mesh for filtrating impurities is mounted to a gate of a molding die of a casting machine, and aluminum (including an aluminum alloy) under a molten condition is poured from the gate so as to manufacture a wheel of a car. In this step, after the wheel is manufactured, a biscuit B wherein the wire mesh is submerged in the aluminum material formed at the gate, is put in an elevating basket 4. After the elevating basket 4 is hung up and moved along a rail 6, the basket 4 is lowered and dipped into a molten aluminum H of lower temperature than the melting point of the wire mesh in a dissolution tank 3. After only the aluminum material is dissolved, the wire mesh is pulled out from the molten aluminum H so as to separate the aluminum material and the wire mesh.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a biscuit dissolving and separating method and a biscuit dissolving and separating apparatus. More specifically, when an aluminum wheel (including an aluminum alloy; the same applies hereinafter) constituting a wheel of an automobile is manufactured by a casting machine, a scrap called a so-called biscuit formed at a gate of the casting machine is melted. Further, the present invention relates to a dissolution / separation method and a dissolution / separation apparatus for separating from a wire mesh for impurity filtration embedded in the biscuit.

[0002]

2. Description of the Related Art Aluminum wheels, which are parts of automobile wheels to which tires are attached, are often used because they are lightweight. As shown in FIG. 4, the aluminum wheel W is usually manufactured by injecting molten aluminum (aluminum alloy) into a molding die 7 of a high-pressure casting machine from a gate 7a.

At this time, a wire net N is attached to the gate 7a of the molding die 7 in order to prevent impurities such as dust contained in the molten aluminum from entering the die 7. Therefore, after the manufacture of the wheel W is completed, a scrap called a biscuit B in which the wire mesh N is embedded is formed and remains in the gate 7a. Since the biscuit B is naturally made of aluminum, it can be melted and used again as the material of the wheel W. However, since the wire mesh N for removing impurities remains in the biscuit B as shown in FIG. 5, the wire mesh N is removed in order to reuse the aluminum material A. There is a need.

Conventionally, in order to separate the aluminum material A of the biscuit B from the wire mesh N, as shown in FIG. 6, the biscuit B is placed in a reverberatory furnace 8 and the aluminum material A is melted by radiant heat of a burner 9. After that, a method of taking out the wire mesh N having a higher melting point than aluminum and still having the original shape from the reverberatory furnace has been adopted. Similarly, the portion of the biscuit B where the wire mesh N is embedded is cut, and only the cut portion is melted by the radiant heat of the burner 9 in the reverberatory furnace 8 to separate the aluminum material A from the wire mesh N. Means were taken.

[0005]

However, in this prior art, since the gas is melted in a gas inside the reverberatory furnace, the temperature in the reverberatory furnace changes relatively sharply, and the temperature becomes temporarily higher than necessary. In some cases, the radiant heat of the burner directly hits the biscuit B.
As a result, not only does the aluminum material dissolve, but a higher temperature than necessary also acts on the wire mesh N, causing a problem that iron or the like of the wire mesh N is mixed into the dissolved aluminum. Since the aluminum material A is to be reused, it is not possible to manufacture an aluminum wheel W having excellent quality if so-called impurities such as iron are mixed.

Further, since the step of melting the biscuit B in the reverberatory furnace is troublesome, it is difficult to melt and separate the biscuit B in the production line of the wheel W, and therefore, it has been necessary to entrust a specialist. This has been a major problem in improving the productivity of the wheel W.

Accordingly, an object of the present invention is to provide a biscuit dissolution / separation method and a biscuit dissolution / separation apparatus capable of separating an aluminum material of a biscuit from a wire mesh without mixing impurities such as iron in the wire mesh. Is to do.

[0008]

In order to achieve the above-mentioned object, according to the present invention, there is provided a biscuit dissolving and separating method according to the present invention, wherein impurities are filtered through a gate (7a) of a molding die (7) of a casting machine. In a process of manufacturing a vehicle wheel (W) by attaching a metal wire mesh (N) and injecting molten aluminum from the gate (7a), the aluminum is formed in the gate (7a) after the manufacture of the wheel (W). Biscuits (B) in which a wire mesh (N) is embedded in an aluminum material (A) are immersed in molten aluminum (H) at a temperature lower than the melting point of the wire mesh (N) to melt only the aluminum material (A). The metal mesh (N) is taken out of the molten aluminum (H), and the aluminum material (A) and the metal mesh (N) are separated. Note that the “aluminum” mentioned here includes “aluminum alloy” mainly composed of aluminum.

In the biscuit melting and separating apparatus according to a second aspect of the present invention, a wire mesh (N) for filtering impurities is attached to a gate (7a) of a molding die (7) of a casting machine, and molten aluminum is used for the gate. In the process of manufacturing a wheel (W) of an automobile by injecting from the (7a), a wire mesh (N) is embedded in an aluminum material (A) formed on a gate (7a) after the manufacture of the wheel (W). A storage tank (1) for separating an aluminum material (A) and a wire mesh (N) from a biscuit (B), and storing a molten aluminum (H) maintained in a molten state by a burner (2);
A melting tank (3), which communicates with the storage tank (1) and stores an aluminum melt (H) at a temperature lower than the melting point of the wire mesh (N), and a biscuit (B). The aluminum material (A) is immersed in the molten aluminum (H) of the melting tank (3), leaving the wire netting (N) of the biscuit (B), and then rises and is separated from the melting tank (3). An elevating basket (4) made of a material having a high melting point.

Further, the biscuit melting and separating apparatus according to the third aspect of the present invention is directed to a gate (7) of a molding die (7) of a casting machine.
In the step of manufacturing a wheel (W) of an automobile by attaching a wire mesh (N) for filtering impurities to a) and injecting aluminum in a molten state from a gate (7a),
Apparatus for separating aluminum material (A) and wire mesh (N) from biscuit (B) in which wire mesh (N) is embedded in aluminum material (A) formed in gate (7a) after manufacturing wheel (W) And a storage tank (1) for storing the molten aluminum (H) maintained in a molten state by the burner (2), and the molten aluminum having a temperature lower than the melting point of the wire mesh (N) communicating with the storage tank (1). A melting tank (3) for storing (H), an electromagnetic molten metal conveying device (Y) provided in the melting tank (3) for circulating the aluminum molten metal by using electromagnetic force, and a biscuit (B). The biscuit (B) is immersed in the flow of the molten aluminum (H) in the melting tank (3) circulated by the electromagnetic molten metal transport device (Y), and the wire mesh (N) of the biscuit (B) is lowered. Aluminum material (A) Increased after dissolving detached from dissolving tank (3), and high material made of cabin from aluminum melting (4), characterized in that it comprises a. It should be noted that “aluminum” described in claims 1 to 3 includes “aluminum alloy” containing aluminum as a main material.

Symbols in parentheses indicate corresponding elements or matters described in the drawings and the embodiments of the invention described later.

According to the biscuit melting / separating method according to the first aspect of the present invention and the biscuit melting / separating apparatus according to the second and third aspects, both biscuits are immersed in molten aluminum at a temperature lower than the melting point of the wire mesh. Therefore, the aluminum material of the biscuit and the wire mesh can be separated without being mixed with the aluminum material in which iron or the like of the wire mesh is dissolved.

That is, since the molten aluminum in which the biscuit is immersed is in a liquid state, the temperature does not change abruptly as compared with the gas in the conventional reverberatory furnace. Therefore, when the biscuit is immersed in the molten aluminum set to an appropriate temperature, only the aluminum material is dissolved, and the iron of the wire mesh is hardly dissolved. Also, since the radiant heat of the burner does not directly hit the biscuit, the wire mesh is not greatly affected by the radiant heat. Therefore, only the aluminum material of the biscuit immersed in the molten aluminum is melted by the molten aluminum. After the melting, the metal mesh is taken out of the molten aluminum, so that the aluminum material and the metal mesh can be separated without mixing iron in the molten aluminum material.

Further, the melting and separating method and the melting and separating apparatus, in which a biscuit is immersed in a molten aluminum to separate an aluminum material and a wire net, are easier to implement than conventional means for separating by a burner in a reverberatory furnace. Therefore, it can be added to the wheel production line.

In particular, according to the biscuit melting and separating apparatus of the third aspect, the biscuit is immersed in the flow of the molten aluminum circulated by the electromagnetic molten metal conveying device provided in the melting tank. Is quickly separated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a biscuit dissolving and separating apparatus according to the present invention, which is one means for achieving the biscuit dissolving and separating method of the present invention, will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a biscuit dissolution / separation apparatus, and FIG. 2 is a plan view of the same apparatus.

In the biscuit melting and separating apparatus according to the embodiment of the present invention, a wire net N for filtering impurities is attached to a gate 7a of a molding die 7 of a casting machine, and molten aluminum is injected from the gate 7a. In the process of manufacturing the wheel W, the gate 7 of the wheel W is manufactured after the wheel W is manufactured.
A device for separating an aluminum material A and a wire mesh N from a biscuit B in which a wire mesh N is embedded in an aluminum material formed in a storage tank 1, a melting tank 3, and a lifting basket 4
Is provided.

During operation, the storage tank 1 stores the molten aluminum H which is always kept in a molten state by the burner 2. The two burners 2 are provided on the rear wall 1c of the storage tank 1, and maintain the molten state efficiently by directly heating the molten aluminum H in the storage tank 1.

The dissolving tank 3 comprises a storage tank 1 and a partition wall 1 between the two.
a is communicated with a through a passage 1b through which the molten aluminum H can pass, and stores the molten aluminum H kept at a temperature lower than the melting point of the wire mesh N. Aluminum melt H in melting tank 3
Is connected to the molten aluminum H in the storage tank 1 by the passage 1b, so that the molten aluminum H in both the tanks 1 and 3 freely convects through the passage 1b according to a temperature change. Therefore, the molten aluminum H in the melting tank 3 can always maintain a molten state during operation.

The elevator car 4 accommodates the biscuit B and descends, immerses the biscuit B in the molten aluminum H of the melting tank 3, and rises after the aluminum material A is melted while leaving the wire mesh N of the biscuit B. It is detached from the melting tank 3. Since the elevator car 4 is made of a material having a higher melting point than aluminum (for example, iron, silicon carbide, alumina, fine ceramic, etc.), it is not melted by the molten aluminum H. In addition,
The elevator car 4 is held by a wire 5 and is movable up and down, and is set to be horizontally movable along a rail 6.

Since the partition 1a is formed between the melting tank 3 and the storage tank 1, the radiant heat of the burner 2 provided in the storage layer directly acts on the biscuit B in the elevator car 4. Nothing. Therefore, the problem that the wire mesh N of the biscuit B emits the iron or the like by the radiant heat of the burner 2 does not occur.

The biscuit dissolution / separation apparatus according to the present embodiment operates as follows. First, the biscuit B is put in the elevator car 4. Next, the elevator car 4 is lifted and the rail 6
, Then descend and immerse in the molten aluminum H in the melting tank 3. After a certain period of time has passed and the aluminum material A of the biscuit B has melted, the elevator car 4 is pulled up to take out the wire mesh N remaining therein. Thereby, the aluminum material A of the biscuit B and the wire mesh N are reliably separated.

Here, the molten aluminum H in the melting tank 3
Is usually maintained at 830 ° C. Incidentally, the melting point of aluminum is about 660 ° C, and the melting point of iron is about 1530 ° C. Accordingly, the aluminum material A of the biscuit B is melted by the molten aluminum H, and the wire mesh N is not melted, and the original shape is maintained. The biscuit B to be subjected to dissolution separation is usually a small-diameter portion (the upper end portion in FIG. 4).
Is 80φ or less and the large diameter part (lower part in FIG. 4) is 120φ
Below, the height is less than 180mm and the weight is about 2.0 ~
2.5 kg. Such biscuit B is 830 ° C
The aluminum material A and the wire mesh N can be separated by dipping in the aluminum melt H for about 20 seconds.

FIG. 3 shows a biscuit dissolving and separating apparatus according to another embodiment of the present invention. This is because the molten aluminum H is placed in the melting tank 3 of the biscuit melting and separating apparatus shown in FIG.
Is provided with an electromagnetic molten metal transport device Y that circulates by utilizing electromagnetic force. According to this, since the biscuit B is immersed in the flow of the molten aluminum H circulated by the molten metal transporting device Y, the aluminum material A and the wire mesh N are quickly separated.

[0025]

As described above, according to the first and second and third aspects of the present invention, both biscuits are immersed in molten aluminum having a temperature lower than the melting point of the wire mesh N.
Since the wire mesh is taken out of the molten aluminum after the aluminum material is melted, the aluminum material of the biscuit and the wire mesh can be separated without mixing iron or the like of the wire mesh with the aluminum material. This allows
The aluminum material of the biscuit can be reused as a material for the wheel, which is economical.

[0026] Claims 1 and 2 of the present invention.
According to the invention described in 3 above, both can be added to a wheel production line because they are easier to implement than conventional means for separating by a burner in a reverberatory furnace. Therefore, productivity is improved.

[0027] In particular, according to the biscuit melting and separating apparatus of the third aspect, the biscuit is immersed in the flow of the molten aluminum circulated by the electromagnetic molten metal transport device provided in the melting tank, so that the aluminum material and the wire mesh Is quickly separated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a biscuit dissolution / separation apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the biscuit dissolution / separation apparatus shown in FIG.

FIG. 3 is a plan view of a biscuit melting / separating apparatus according to another embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing a molding die, a wheel and a biscuit formed by a gate of the molding die.

FIG. 5 is a perspective view of the biscuit shown in FIG. 4;

FIG. 6 is a longitudinal sectional view showing a conventional reverberatory furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage tank 1a Partition wall 1b Passage 1c Rear wall 2 Burner 3 Melting tank 4 Elevating basket 5 Wire 6 Rail 7 Mold 7a Gate 8 Reflection furnace 9 Burner H Aluminum molten metal W Wheel B Biscuit A Aluminum material N Wire net Y Electromagnetic molten metal transport device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B22D 31/00 F27B 3/04 B60B 21/00 B09B 3/00 ZAB F27B 3/04 303A (72) Inventor Shinichi Sozono 145-1, Yufutsu, Tomakomai City, Hokkaido Toyota Motor Corporation Hokkaido Co., Ltd. 1451-1 Yufutsu, Tomakomai-shi F-term in Toyota Motor Hokkaido Co., Ltd. (Reference) 4D004 AA26 AB03 CA12 CA15 CA29 CB03 CB21 CB34 CB44 DA02 DA06 4E014 NA08 NA13 4K045 AA06 BA03 RB12 RB29

Claims (3)

[Claims] 1. A step of manufacturing a wheel of an automobile by attaching a wire mesh for filtering impurities to a gate of a molding die of a casting machine and injecting molten aluminum from the gate to form the gate after the wheel is manufactured. Biscuit in which the wire mesh is embedded in the aluminum material to be
A method for dissolving and separating a biscuit, comprising: immersing in a molten aluminum at a temperature lower than the melting point of a wire mesh to melt only the aluminum material, removing the wire mesh from the molten aluminum, and separating the aluminum material and the wire mesh. 2. A process for manufacturing a wheel of an automobile by attaching a wire mesh for impurity filtration to a gate of a molding die of a casting machine and injecting molten aluminum from the gate to form the gate after the wheel is manufactured. A device for separating an aluminum material and a wire mesh from a biscuit in which a wire mesh is buried in an aluminum material to be prepared, comprising: a storage tank that stores molten aluminum that is maintained in a molten state by a burner; and a wire mesh that communicates with the storage tank. A melting tank storing an aluminum melt having a temperature lower than the melting point of the biscuit; and lowering by storing the biscuit; dipping the biscuit in the aluminum melt of the melting tank; Characterized in that it comprises a lifting basket made of a material having a higher melting point than aluminum, which is separated from the melting tank. Biscuit dissolving and separating equipment. 3. A process for manufacturing a wheel of an automobile by attaching a wire mesh for impurity filtration to a gate of a molding die of a casting machine and injecting molten aluminum from the gate to form the gate after the wheel is manufactured. A device for separating an aluminum material and a wire mesh from a biscuit in which a wire mesh is buried in an aluminum material to be prepared, comprising: a storage tank that stores molten aluminum that is maintained in a molten state by a burner; and a wire mesh that communicates with the storage tank. A melting tank for storing the aluminum melt at a temperature lower than the melting point of the aluminum melt; an electromagnetic melt transport device provided in the melt tank for circulating the aluminum melt by using an electromagnetic force; The biscuit is immersed in a flow of the molten aluminum in the melting tank circulated by the electromagnetic molten metal transport device, Leaving wire mesh increases after dissolving aluminum material disengaged from said dissolving tank, biscuits dissolution separation device characterized by and a cabin made of high melting point material than aluminum.