JPH03258448A - Electromagnetic molten metal supplying device for die casting machine - Google Patents

Abstract

PURPOSE:To manufacture an Mg die casting product with high yield to raw material without oxidizing Mg with the air by pressing the molten Mg into a die with electromagnetic pump under inert gas atmosphere in a vessel for molten Mg at the time of casting under pressurizing the molten Mg, etc., into the die in the die in the die casting machine. CONSTITUTION:At the time of executing the die casting to the molten metal 18, which is extremely easy to oxidize, such as Mg, into the die 2, the molten Mg 8 is charged into a crucible 6 in a temp. holding furnace 5 and supplied into a chamber 7 with an electromagnetic pump 13 through a discharging tube 14. The molten Mg 18 in the chamber 7 is supplied into an injection sleeve 1 in the die casting machine from molten metal supplying tube 4 at the fixed quantity with an electromagnetic pump 3 for supplying the fixed quantity and cast under pressurizing into the die 2. in this case, the inert gas of SF6, etc., is supplied into the crucible 6 and the air-tight chamber 7 from an inert gas supplying source 11 and also, the molten Mg 18 in the chamber 7 is circulated between the chamber and the crucible 6 through small hole (a) at bottom part of the chamber 7 so as to always keep the molten Mg surface La the constant height with molten metal surface keeping device 12 composed of a molten metal surface sensor 15, electromagnetic pump 13 and electrical power source 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water heater using an electromagnetic pump for magnesium and zinc die casting machines.

[Conventional technology] In the conventional die-casting machine for magnesium,
The molten magnesium was manually drawn out of the molten metal furnace covered with inert gas using a ladle, etc., covered to prevent exposure to air, and fed into a die-casting machine for molding.

[Problems to be solved by the invention] Since molten magnesium reacts violently with air, the surface of the molten metal must be always covered with inert gas to avoid contact with air as much as possible, and it is also necessary to protect the molten metal from shocks caused by collecting and transporting the molten metal. However, a great deal of attention must be paid to the molding process, which has disadvantages in that the cycle time of the molding cycle increases and the quality of the product also deteriorates.

It is an object of the present invention to provide an electromagnetic pump water heater that is free from oxidation and impact on molten magnesium metal, has automatic transport of molten metal, and has good quantitative performance and temperature control of the molten metal.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a chamber with an air-tight structure immersed in the molten metal of a molten metal insulating furnace with an air-tight structure, an upper space of the chamber, and an upper space of the molten metal insulating furnace. an inert gas coating means for supplying an inert gas into the space; a tMi pump immersed in the molten metal of the molten metal insulating furnace;
A constant hot water level maintaining device that connects a discharge pipe of an im pump to the chamber, detects the hot water level of the chamber with a hot water level sensor inscribed in the chamber, and controls an electromagnetic pump to keep the hot water level constant. tii! for a die-casting machine, which comprises: a suction pipe connected to the side wall of the chamber, and a quantitative hot water supply electromagnetic pump whose discharge side is connected to a hot water supply pipe leading to the injection sleeve of the die-casting machine. It was a li water heater.

[Function] Fill the upper space of the chamber and crucible with inert gas,
The molten metal is supplied to the injection sleeve through the hot water supply pipe without being exposed to air, and the molten metal in the crucible is automatically supplied to the sleeve.

[Example] The present invention will be described in detail below based on drawings of embodiments.

FIG. 1 is a sectional view of one embodiment, in which 1 is an injection sleeve of a die-casting machine attached to a mold device 2. FIG.

5 is a molten metal heat retention furnace in which a crucible 6 is installed, and the outside of the crucible 6 is heated by a heating means (not shown) to prevent solidification of the magnesium molten metal 8 (hereinafter simply referred to as molten metal) accumulated inside.

The crucible 6 is made of iron, which does not react with the molten metal 8, and the opening at the top of the crucible 6 is closed with a cover 9, making it airtight.

The molten metal 8 in the crucible 6 is pumped out by an electromagnetic pump 13, passes through a discharge pipe 14, and is temporarily stored in an airtight chamber 7. At the time of casting, the molten metal 8 is pumped out by an electromagnetic pump 13, and after being temporarily accumulated in an airtight chamber 7, it is supplied at a constant rate through a hot water supply pipe 4 equipped with an electromagnetic pump 3 for dispensing fixed amount of hot water during casting. A quantity of molten metal is metered into the injection sleeve 1.

The chamber 7 is immersed in the molten metal 8, and a small hole 17 is made in the lower wall of the chamber 7, and the molten metal 18 accumulated in the chamber 7 flows into the molten metal 8 in the crucible 6 as shown by arrow a. It is possible to flow out, creating a small circulation flow,
The temperature of the molten metal 8 is kept constant. Crucible 6
A pipe 10 from an inert gas supply source 11 is provided in the space above the molten metal 8.18 in the chamber 7.
, etc. are introduced to cut off contact with air.

15 is a level sensor for monitoring the amount of molten metal in the chamber 7;
It acts on the driving power supply 16 of the i-pump 13, controls the 11M1 pump 13, and raises the molten metal 18 in the chamber 7 to a predetermined level.
It is controlled to maintain the

The i5 hot water leak sensor 15, the tiM1 pump]3, and the driving power source 16 are collectively referred to as a constant hot water level holding device 12.

In such a configuration, when leaking hot water 18 is supplied to the injection sleeve 1 through the hot water supply pipe 4, the hot water level in the chamber 7 attempts to fall from the hot water level setting level L, but at this time, the hot water level sensor 15 This is detected, and the amount of molten metal supplied by the electromagnetic pump 13 is controlled via the driving power source 16. As a result, the volume of the molten metal in the chamber 7 corresponding to the volume of the molten metal 418 supplied to the injection sleeve 1 is replaced by the molten metal 8 in the crucible 6, and the molten metal level in the chamber 7 rises to the set level L.
is maintained.

The molten metal 1 is supplied to the injection sleeve via the hot water supply pipe 4 while the molten metal surface is maintained at the set level L.
8 shares its temperature with the molten metal 8 in the crucible 6 through the hole 17 provided at the lower part of the chamber 7, so that the constant operation of the quantitative hot water supply electromagnetic pump 3 makes the quantitative and temperature control extremely accurate. achieved.

Note that the inert gas in the upper space of the chamber 7 and the crucible 6 is appropriately supplied by the inert gas supply source 11 even when the molten metal 8.18 changes.

FIG. 2 is a cross-sectional view of another embodiment, and the same parts as in FIG. 1 are given the same reference numerals and explanations are omitted, and only the parts that are different in this embodiment are given new numbers and explained. In this embodiment, an electromagnetic pump 13 for supplying molten metal to the chamber 7 is disposed outside the molten metal heat retention furnace 5.

In addition, the suction pipe 19 of the magnetic pump 1i is connected to the bottom wall of the crucible 6, and the lower end of this suction pipe 19 is closed.
The discharge pipe 20 is inserted into the excitation coil No. 3 in the form of a double pipe.

The part installed inside the excitation coil of the electromagnetic pump 13 is a tube 20a made of cobalt alloy, which is a high-temperature magnetic material, and the upper end of the discharge tube 20a is connected to the chamber 7 to supply the molten metal 8 to the chamber 7. ing.

In such a configuration, when the molten metal 18 is supplied to the injection sleeve 1 through the oil supply pipe 4, the molten metal level in the chamber 7 attempts to fall from the molten metal level setting level L, but at this time, the molten metal level sensor 15 detects this level. is detected, and the amount of molten metal supplied by the electromagnetic pump 13 is controlled via the driving power source 16. As a result, the volume of the molten metal in the chamber 7 corresponding to the volume of the molten metal 18 supplied to the injection sleeve l is replaced by the molten metal 8 in the crucible 6, and the molten metal level in the chamber 7 rises to the set level L.
is maintained.

The molten metal 1 is supplied to the injection sleeve 1 via the hot water supply pipe 4 while the molten metal surface is maintained at the set level L in this way.
8 transfers the temperature to the melt inside the crucible 6 through a hole 17 provided at the bottom of the chamber 7. Since it is common to 4I8, the fixed amount and temperature control can be achieved with extremely high accuracy by simply operating the magnetic pump 3 at a constant rate for the fixed amount hot water supply 1.

Incidentally, the inert gas in the upper space of the chamber 7 and the crucible 6 is appropriately supplied by the 6 inert gas supply source 11 depending on the fluctuation of the molten metal 8.18.

The present invention is not limited to a vertical injection die casting machine in which the injection sleeve 1 is arranged vertically, but also applicable to a horizontal injection die casting machine in which the injection sleeve 1 is arranged horizontally as shown in Fig. 3. It is something to do.

[Effects of the Invention] As described above, the chamber is immersed in the molten metal in the molten metal insulating furnace, and the suction head of the metered heating electromagnetic pump is held constant by the electromagnetic pump of the constant molten metal level holding device, thereby improving the quantitative property of the molten metal. In addition, by circulating the molten metal to maintain a constant molten metal temperature, coating the molten metal surface of the chamber and molten metal insulating furnace with inert gas, and using an electromagnetic pump for automatic molten metal transport, the molten metal can be A water heater without oxidation or impact can be realized.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of another embodiment, and FIG. 3 is a partial sectional view of FIG. 2. l...Injection sleeve, 2--Mold device, 3...Quantitative hot water supply! Magnetic pump, 4... Hot water supply pipe, 5-... Molten metal heat retention furnace, 6-... Crucible, 7... Chamber, 8... Molten metal, 9-... Cover, 10... Piping, 11- ...Inert gas supply source, 12... Constant hot water level holding device, 13... Electromagnetic pump, ]4... Discharge pipe, 15... Hot water level sensor,
16--driving power source, 17--hole, 18--molten metal, 19--suction pipe, 20--discharge pipe.

Claims (3)

[Claims] (1) a chamber with an airtight structure immersed in the molten metal of a molten metal insulating furnace with an airtight structure; an inert gas covering means for supplying an inert gas to the upper space of the chamber and the upper space of the molten metal insulating furnace; An electromagnetic pump is immersed in the molten metal of the molten metal heat retention furnace, a discharge pipe of the electromagnetic pump is connected to the chamber, and a molten metal level sensor inscribed in the chamber detects the molten metal level in the chamber to maintain a constant level. A fixed hot water level holding device that controls an electromagnetic pump to maintain a fixed hot water level, and a metering hot water supply electromagnetic pump having a suction pipe connected to the side wall of the chamber and a hot water supply pipe leading to the injection sleeve of the die casting machine connected to its discharge side. An electromagnetic water heater for die casting machines characterized by the following. (2) The electromagnetic hot water supply device for a die-casting machine according to claim 1, characterized in that an electromagnetic pump is arranged outside the molten metal insulating furnace in place of the electromagnetic pump provided inside the molten metal insulating furnace. (3) The electromagnetic hot water supply device for a die-casting machine according to claim 1, wherein the chamber has a hole in the lower wall of which the flow rate is smaller than the supply rate of the electromagnetic pump of the constant hot water level holding device. .