JPH10263781A - Die casting device for mg alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily die-cast a thin-walled product by providing an evacuating means in a cavity, and providing a heating means on a die thereby improving the running of molten alloy even when the cavity is of thin-walled shape. SOLUTION: This die casting device 10 for Mg alloy in which the molten Mg alloy is press-poured in a cavity 13 comprising a die, a vacuum die-cast device (evacuating means) 20 is connected to the cavity 13 through a suction passage 21. Because the cavity 13 can be evacuated by operating the vacuum die-cast device 20, the molten Mg runs excellently even when the cavity is of thin-walled shape. The heated oil is circulated around a fixed die 11 and a movable die 12 by a die heating device 30, and a sleeve 14 and a gate 141 in addition to the fixed die 11 and the movable die 12 can be heated, and the molten Mg runs excellently even when the cavity 13 is large and of thin-walled shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting apparatus, which is used for die casting of an Mg alloy.

[0002]

2. Description of the Related Art In a die casting apparatus, a cold chamber method can generally perform casting of a large product. Therefore, a magnesium alloy is also used for casting of a large product.

[0003]

However, on the other hand, this cold chamber type die casting apparatus has a disadvantage that it is generally difficult to cast a thin product, and therefore it is difficult to cast a thin product even with an Mg alloy. .

An object of the present invention is to eliminate these disadvantages.

[0005]

In order to achieve the above-mentioned object, in a die casting apparatus for Mg alloy according to the present invention, a molten alloy of Mg alloy is injected under pressure into a cavity formed by a mold. In the die casting apparatus, since the cavity is provided with a depressurizing means and the mold is provided with a heating means, the molten metal is suctioned under reduced pressure and is less likely to heat down. Well done.

[0006]

FIG. 1 is a partial sectional view of a casting apparatus using a molten metal supply apparatus according to the present invention, and FIG. 2 is an enlarged sectional view of a portion II in FIG.

In FIG. 1, reference numeral 10 denotes a die casting machine;
Is a fixed type, and 12 is a movable type. Each of the fixed mold 11 and the movable mold 12 is a mold, and forms a cavity 13. Reference numeral 14 denotes a sleeve, which is installed on the fixed mold 11. The sleeve 14 is connected to the cavity via a weir 141.
Communicates with 13. A plunger 15 is inserted into the sleeve 14 so as to be able to advance and retreat. By pushing out the plunger 15, the molten Mg in the sleeve 14 can be poured under pressure into the cavity 13.
The cavity 13 can be opened and closed by moving the movable mold 12 with respect to the fixed mold 11.

Reference numeral 20 denotes a vacuum die casting apparatus (corresponding to “decompression means” of the present invention), which is connected to the cavity 13 via a suction path 21. By operating the vacuum die-casting device 20, the pressure in the cavity 13 can be reduced, so that even when the cavity 13 has a thin shape, the Mg melt can be satisfactorily run around.

Reference numeral 30 denotes an oil circulation type mold heating device (corresponding to the "heating means" of the present invention), which is connected to the fixed mold 11 and the movable mold 12 via oil passages 31,31. The mold heating device 30 circulates heating oil through the fixed mold 11 and the movable mold 12 to heat the fixed mold 11 and the movable mold 12 as well as the sleeve 14 and the weir 141. Even if the material is large and thin, the molten Mg can be circulated well.

Reference numeral 40 denotes a melting furnace, and 41 denotes a melting tank of the melting furnace 40. The preheated Mg alloy ingot supplied from the ingot supply device 70 is melted in the melting tank 41 to become a molten Mg alloy M. Reference numeral 43 denotes a metal pump installed in the melting furnace 40. The metal pump 43 transfers the Mg alloy melt M in the melting tank 41 through a melting pipe 44 provided with a heater heating device (not shown). Can be transferred with minimal contact with the atmosphere.

Reference numeral 50 is a molten metal holding furnace, and 51 is a molten metal tank.
The molten metal M from the melting tank 41 is temporarily stored in the molten tank 51. Numeral 53 denotes an electromagnetic pump installed in the holding furnace 50, and an M pump in the molten metal tank 51 through a molten metal supply pipe 60.
The molten g alloy M can be supplied into the sleeve 14 of the die casting machine 10 with minimum contact with the atmosphere.

Next, in FIG. 2, reference numeral 61 denotes a molten metal transfer pipe, and a heater heating device 64 is provided around the molten metal transfer pipe 61. The molten metal transfer pipe 61 is disposed obliquely upward in the direction of transferring the molten Mg alloy M (to the left in the figure). Reference numeral 62 denotes a molten metal injection pipe 62, and a heater heating device 64 is provided around the molten metal injection pipe 62. The molten metal injection pipe 62 communicates with the tip of the molten metal transfer pipe 61, and is disposed downward in the injection direction.
The molten metal supply pipe section 60 is constituted by the molten metal transfer pipe 61 and the molten metal injection pipe 62.

Reference numeral 63 denotes a gas chamber, which is provided at a continuous portion between the molten metal transfer pipe 61 and the molten metal injection pipe 62. An inert gas inlet 65 is provided at the top of the gas chamber 63. ing. This gas chamber 63 is filled with a pressurized (5 kgf / cm ² ) inert gas G such as SF ₆ + CO ₂ , Ar, N ₂ or He.

When the supply of the molten metal into the sleeve 14 is shut off, the Mg alloy molten metal M in the molten metal injection pipe 62 is filled into the sleep 14 by gravity, and the molten metal surface S exists in the molten metal transfer pipe 61. At this time, since the space of the molten metal transfer pipe 61 and the molten metal injection pipe 62 are filled with the pressurized inert gas, the molten metal surface S
Oxidation is prevented. Also sleep 14 and cavity
Since an inert gas is also flowed into 13, the oxidation is prevented when the molten metal flows. The angle of inclination of the molten metal transfer pipe 61 is preferably as large as it is necessary to reduce the area of the molten metal surface S, but it is necessary to increase the head (magnetic force) of the electromagnetic pump 53 if the angle of inclination is too large. Since it is necessary to increase the number of outer peripheral heaters for preventing the reduction, it is preferable to determine the outer peripheral heater in relation to the capacity of the electromagnetic pump 53.

[0015]

According to the present invention, there is provided a die casting apparatus for Mg alloy in which a molten metal of Mg alloy is pressurized and poured into a cavity formed by a mold. Since the mold is provided with the heating means, the molten metal is sucked under reduced pressure and hardly falls down. As a result, even if the cavity has a thin shape, the molten metal can be circulated well.

Therefore, if this die casting apparatus is used, it is easy to die-cast a thin product even with an Mg alloy.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a casting apparatus using a molten metal supply device according to the present invention.

FIG. 2 is an enlarged sectional view of a portion II in FIG.

[Explanation of symbols]

 10: Die casting machine (die casting device) 11: Fixed die (die) 12: Movable die (die) 13: Cavity 20: Vacuum die casting device (decompression means) 30: Die heating device (heating means) M: Mg Alloy melt

Claims (1)

[Claims] 1. An Mg alloy die casting apparatus for pressurizing and pouring molten Mg alloy into a cavity formed by a mold, wherein said cavity is provided with a pressure reducing means and said mold is provided with a heating means. Die casting apparatus for Mg alloy.