JPH10263795A - Molten metal feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it difficult to oxidize the molten metal surface by forming a gas chamber in a connection part of a molten metal transfer pipe to a molten metal pouring pipe, and introducing the inert gas from an upper part of the gas chamber to make the molten metal surface present in the molten metal transfer pipe when the molten metal feed into a sleeve is shut off, and to cover the molten metal surface in the molten metal feed pipe with the inert gas. SOLUTION: A molten metal transfer pipe 61 is arranged diagonally upward in the transfer direction of the molten Mg alloy M. A molten metal pouring pipe 62 is communicated with a tip of the molten metal transfer pipe 61, and arranged downwardly in the pouring direction to constitute a molten metal feed pipe 60. A gas chamber 63 is provided at a connection part 66 of the molten metal transfer pipe 61 to the molten metal pouring pipe 62, an inert gas inlet 65 is provided in a top part of the gas chamber 63, and the inert gas G is filled in the gas chamber 63. When the molten metal feed in a sleeve is shut off, the molten Mg alloy M in the molten metal pouring pipe 62 is filled in the sleeve by the gravity, and the molten metal surface S is present in the molten metal transfer pipe 61. Because a space part of the molten metal transfer pipe 61 and the molten metal pouring pipe 62 are filled with the inert gas, the molten metal surface S is prevented from being oxidized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal supply device, and is used for supplying molten metal into a sleeve of a die casting machine via a molten metal supply pipe by a pump.

[0002]

2. Description of the Related Art In a conventional molten metal supply apparatus of this type, a molten metal supply pipe is disposed below a sleeve, the molten metal is filled in the sleeve, and the molten metal in the sleeve is extruded into a cavity. After that, the evacuated sleep was filled with an inert gas to prevent oxidation of the molten metal surface of the molten metal supply pipe.

[0003]

However, in such a conventional method, the molten metal is cut off at the lower surface of the chip at the time of injection, so that a solidified layer is formed, and the solidified layer causes tangling between the chip and the sleeve. However, there is a disadvantage that the solidified layer is caught in the cavity.

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

[0005]

In order to achieve the above object, in a molten metal supply apparatus according to the present invention, a molten metal transfer pipe disposed obliquely upward in a molten metal transport direction and a molten metal transfer pipe arranged downward in a molten metal injection direction. In the molten metal supply device in which the molten metal injection pipe disposed in the molten metal supply device is connected through a continuous portion, a gas chamber is provided in the continuous portion, and an inert gas inlet is provided in an upper portion of the gas chamber. When the supply of molten metal to the melt is shut off, the surface of the molten metal in the molten metal supply pipe section is present in the molten metal transfer pipe, and the inert gas is supplied from the inert gas inlet into the space of the molten metal transfer pipe, the molten metal injection pipe, and the gas chamber. Can be charged.

[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 device through a suction path 21,
It is connected to the cavity 13. By operating the vacuum device 20, the pressure in the cavity 13 can be reduced, so that even when the cavity 13 has a thin shape, the molten Mg can be circulated well.

Reference numeral 30 denotes an oil circulation type mold heating device, which is an oil passage.
The fixed mold 11 and the movable mold 12 are connected via 31, 31. The heating oil is circulated through the fixed mold 11 and the movable mold 12 by the mold heating device 30, and the fixed mold 11 and the movable mold 12 are circulated.
12, and thus the sleeve 14 and the weir 141 can also be heated, so that even when the cavity 13 is large and thin, the molten Mg can be satisfactorily run around.

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, 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 arranged 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 66 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. Have been. 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 cut off, the molten Mg alloy M in the molten metal injection pipe 62 is filled into the sleep 14 from above by gravity. Exists. At this time, since the space of the molten metal transfer pipe 61 and the molten metal injection pipe 62 are filled with the inert gas, the oxidation of the molten metal surface S is prevented. In addition, since the inert gas flows into the sleep 14 and the capacity 13, oxidation is prevented when the molten metal flows. The inclination angle of the molten metal transfer pipe 61 is preferably as large as necessary in order to reduce the area of the molten metal surface S. However, when the inclination angle is excessive, the head (magnetic force) of the electromagnetic pump 53 is increased.
Must be increased, and the number of outer peripheral heaters for preventing the temperature from decreasing needs to be increased.

[0015]

The molten metal supply apparatus according to the present invention includes a molten metal transfer pipe disposed obliquely upward in the direction of molten metal transfer and a molten metal injection pipe disposed downward in the direction of molten metal injection through a continuous portion. In the molten metal supply device connected and arranged, a gas chamber is provided in a continuous portion thereof, and an inert gas inlet is provided in an upper portion of the gas chamber. Therefore, when the supply of molten metal into the sleeve is shut off, a molten metal supply pipe is provided. The molten metal surface in the section exists in the molten metal transfer pipe, and the space of the molten metal transfer pipe, the molten metal injection pipe and the gas chamber can be filled with an inert gas through an inert gas inlet.

Therefore, if this molten metal supply device is used,
Since the molten metal surface in the molten metal supply pipe can be covered with the inert gas, the molten metal supplied to the sleeve is not easily oxidized,
It is possible to prevent the tip and the sleeve from generating galling and hardly to form a solidified layer. As a result, it is easy to obtain an appropriate cast product.

[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]

 60… Molten supply pipe section 61… Molten transfer pipe 62… Molten injection pipe 63… Gas chamber 65… Inert gas inlet 66… Continuous section M… Mg alloy melt (molten metal)

Claims (1)

[Claims] 1. A molten metal supply device in which a molten metal transfer pipe arranged obliquely upward in a molten metal transfer direction and a molten metal injection pipe arranged downward in a molten metal injection direction are connected and arranged via a continuous portion. A molten metal supply device, wherein a gas chamber is provided in the continuous portion, and an inert gas inlet is provided above the gas chamber.