JP2001087850A - Molten magnesium supplying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molten magnesium supplying device, capable of shortening heat-up time in a molten metal supplying pipe, eliminating waiting time and preventing solidification of the molten metal in the molten metal supplying pipe during casting operation, by arranging a heating source such as heater in the molten metal supplying pipe between lower part of top plate and the surface of molten metal in a melting furnace, in the molten magnesium supplying device for supplying the molten magnesium stored in the molten furnace into a die casting sleeve arranged in the vicinity of molten furnace. SOLUTION: In the molten magnesium supplying device, an inserting pipe is dipped and arranged to the molten metal supplying pipe positioned between the top plate and a base plate so as to be faced in the vertical direction to the upper surface of the molten magnesium liquid stored in the melting furnace, and a heater for heating the molten magnesium is inserted in the inserting pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnesium water heater using an injection piston for supplying molten magnesium in a melting furnace to a die casting sleeve disposed near the melting furnace, and more particularly to a melting furnace from a lower portion of a top plate of a hot water supply pipe. The present invention relates to a magnesium hot water supply device provided with a heating source even up to the surface of the hot water.

[0002]

2. Description of the Related Art An inert gas is supplied into a melting furnace to prevent oxidation of molten magnesium (hereinafter also referred to as molten metal), and an injection piston in a vertical injection sleeve attached to a base plate is actuated to a certain amount. In a magnesium hot water supply apparatus in which molten magnesium is supplied into a die casting sleeve via a molten metal passage and a hot water supply pipe inside a base plate, a heating source such as a heater is provided in a hot water supply pipe above the top plate. There was no heating source such as a heater between the lower part of the plate and the surface of the molten metal in the melting furnace. For this reason, the hot water supply pipe during this time needs to be heated to a predetermined temperature by the heat from the heater for heating the hot water supply pipe above the top plate and the molten metal in the melting furnace.

[0003] On the other hand, when the casting operation for one day is completed, the heater for heating the hot water supply pipe is turned off in order to prevent oxidation of the molten metal in the hot water supply pipe. Therefore, the molten metal in the hot water supply pipe solidifies. When the casting operation is started the next day, the heater for heating the hot water supply pipe is turned on. At this time, when there is no heating source such as a heater between the bottom of the top plate and the surface of the molten metal in the melting furnace, the molten metal in the corresponding portion may not rise to a predetermined temperature only by heat transfer.

As described above, even when the temperature of the hot water supply pipe above the top plate reaches a predetermined temperature, the temperature of the hot water supply pipe below the top plate to the surface of the molten metal in the melting furnace has not risen to the predetermined temperature. Since the temperature rise in this portion is caused by heat transfer as described above, it takes a considerable time to reach a predetermined temperature. In the worst case, the temperature may not reach the predetermined temperature. Further, sometimes, during the casting operation, the molten metal solidified in this portion. For this reason, a malfunction of the injection piston was induced.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a magnesium hot water supply device using an injection piston for feeding molten magnesium stored in a melting furnace to a die casting sleeve disposed near the melting furnace. By providing a heating source such as a heater also in the hot water supply pipe up to the molten metal surface, the heating time of the hot water supply pipe can be shortened and waiting time can be eliminated, and the molten metal in the hot water supply pipe solidifies during the casting operation. It is an object of the present invention to provide a magnesium hot water supply device capable of preventing the occurrence of the problem.

[0006]

According to a first aspect of the present invention, there is provided an injection sleeve fixed to a base plate suspended from a top plate mounted on the top of a melting furnace. A hot water supply pipe that communicates the molten magnesium stored in the melting furnace with the injection piston moving up and down inside the melting furnace through the molten magnesium passage perforated in the base plate to the outside can be provided to the die casting sleeve. In the magnesium hot water supply apparatus described above, a heating source capable of heating is arranged in the entire area of the hot water supply pipe.

According to a second aspect of the present invention, in the first aspect, the molten magnesium liquid stored in the melting furnace is inserted into the hot water supply pipe located between the top plate and the base plate so as to face vertically. The pipe was immersed and arranged, and a heater for heating the molten magnesium was inserted into the insertion pipe.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 3 relate to an embodiment of the present invention, FIG. 1 is an overall layout view of a magnesium hot water supply apparatus having an injection piston according to the present invention, and FIG. 2 is an embodiment of a hot water supply pipe heating apparatus according to the present invention. FIG. 3 shows another embodiment of the hot water supply pipe heating apparatus according to the present invention.

The configuration of the magnesium water heater used in the present invention will be described with reference to FIG. The molten magnesium 2 stored in the melting furnace is transferred to the base plate 8 by an injection piston 6 that slides inside an injection sleeve 5 fixed to a base plate 8 suspended from a top plate 4 provided on the top of the melting furnace 3. Molten metal passage 13
Is supplied to the die casting sleeve 11 through the hot water supply pipe 10 communicating with the outside through the hot water supply pipe 10.

As the means for moving the injection piston 6 in the axial direction, a servomotor 20 or a hydraulic cylinder can be employed. In the middle of the molten metal passage 13, a check / suction valve 9 for communicating / blocking between the molten magnesium 2 in the melting furnace and the molten metal passage 13 and blocking / communicating between the hot water supply pipe 10 and the pressurizing chamber of the injection piston 6 is provided. At the same time, a drain valve 7 for returning the molten magnesium 2 in the hot water supply pipe 10 to the melting furnace 3 after completion of the casting operation is provided at the end of the molten metal passage 13.

The heater for heating the hot water supply pipe 10 is located above the base plate 4, that is, for a portion outside the melting furnace, a sheath heater is wound around the pipe and the outside thereof is covered with a heat insulating material, or the split is cast. It can be easily installed by using a heater. However, the portion below the base plate 4, that is, the portion inside the melting furnace, cannot be easily mounted due to the problems of airtightness of the penetration portion of the top plate, a change in the level of the molten metal surface, and problems of maintenance and safety. Was.

In the present invention, as shown in FIG. 2, a straight pipe portion which rises vertically from the base plate 8 in the melting furnace and penetrates the top plate 4 is provided, and an insertion pipe 32 is fixed in the hot water supply pipe 10 at this portion. Established. The cartridge heater 31 is detachably mounted in the insertion tube 32. With this configuration, the problem of airtightness in the top plate penetrating portion is eliminated, the heater does not come into direct contact with the molten metal, and the problems of maintenance and safety of components immersed in the molten metal are also eliminated. Also,
By extending the insertion tube to the lowest point (lower limit) of the molten metal surface, the change in the molten metal surface level does not pose a problem.

Next, another embodiment of the present invention will be described with reference to FIG. As shown in FIG. 3, the sheath heater 33 is wound around the entire area of the hot water supply pipe 10. The sheath portion of the heater is made of stainless steel, and it is necessary to prevent the molten metal from coming into direct contact with the sheath heater by the protective tube 30 because magnesium in the molten metal and nickel in the sheath portion react. Also,
It is necessary to determine the height (length) of the protective tube so that the molten metal does not enter the protective tube even when the liquid level reaches the upper limit in consideration of the fluctuation of the liquid level of the molten metal. The above-mentioned problem can be solved by winding the whole area of the hot water supply pipe with the sheath heater in this way.

By configuring the magnesium hot water supply apparatus according to the present invention as described above, the entire hot water supply pipe can be heated by a heating source such as a heater, so that the time for raising the temperature of the hot water supply pipe can be reduced, and the waiting time can be reduced. Along with
It is possible to prevent the molten metal in the hot water supply pipe from solidifying during the casting operation.

[0015]

As described above, since the entire hot water supply pipe is heated, the time for raising the temperature of the hot water supply pipe can be reduced to eliminate the waiting time, and the molten metal in the hot water supply pipe solidifies during the casting operation. Can now be prevented. Therefore, an efficient casting operation became possible.

[Brief description of the drawings]

FIG. 1 is an overall layout view of a magnesium water heater having an injection piston according to an embodiment of the present invention.

FIG. 2 is an embodiment of a hot water supply pipe heating apparatus according to the present invention.

FIG. 3 is another embodiment of the hot water supply pipe heating apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnesium hot water supply apparatus 2 Molten magnesium (molten metal) 3 Melting furnace 4 Top plate 5 Injection sleeve 6 Injection piston 7 Drain valve 8 Base plate 9 Non-return suction valve 10 Hot water supply pipe 11 Die-cast sleeve 13 Melt passage 20 Servo motor (drive part) 21 Ball screw 22 Ball Screw Nut 30 Protective Tube 31 Cartridge Heater 32 Insertion Tube 33 Sheath Heater 34 Insulation Material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B22D 35/06 B22D 35/06

Claims (2)

[Claims] 1. An injection piston moving up and down in an injection sleeve fixed to a base plate suspended from a top plate mounted on the top of a melting furnace and piercing molten magnesium stored in the melting furnace into the base plate. A hot water supply pipe communicating with the outside through a molten metal passage of the molten magnesium, and supplying a heat to the die casting sleeve, wherein a heating source capable of heating is provided in the entire area of the hot water supply pipe. Features a magnesium water heater. 2. An insertion pipe is immersed and disposed in the hot water supply pipe located between the top plate and the base plate so as to be vertically opposed to an upper surface of a molten magnesium liquid stored in a melting furnace. 2. The magnesium hot water supply apparatus according to claim 1, wherein a heater for heating the molten magnesium is inserted in the device.