JPH06226418A - Metal holding furnace for die casting machine - Google Patents

Abstract

PURPOSE:To prevent the mixing of oxide and impurity into a cast product. CONSTITUTION:A setting chamber 12 for settling molten metal is arranged between a molten metal receiving chamber 11 and a molten metal tapping chamber 13 in a holding furnace 10, and a bubbling device 19 for blowing the bubbles of inert gas of nitrogen, argon, etc., for floating up the oxide and the impurity in the molten metal is arranged near the bottom part in the molten metal receiving chamber. Further, a molten metal surface control means for controlling the molten metal surface, the bubbling device and a molten metal heating means are fitted in the molten metal receiving chamber. The bubbling device is composed of a cylinder for storing compressed gas, an introducing pipe and a gas dispersion pipe for dispersing the gas into the molten metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding furnace for a die casting machine, which removes oxides and impurities from a molten metal and prevents oxides and impurities from entering the product.

[0002]

2. Description of the Related Art Generally, there are a molten metal holding furnace for melting and holding molten metal and a holding furnace for only holding molten metal. As an example of the former, as shown in FIG. 8 is introduced into the melting chamber 72 of the melting and holding furnace 70, melted by the gas burner 73, and the molten metal is stored in the tapping chamber 74. An example of the latter is shown in FIG.
There is a method of supplying and storing the molten metal from a melting furnace (not shown) to a crucible furnace 82 of a holding furnace 80 by a large ladle 81 as shown in FIG. Supply to.

As another method of the holding furnace, as shown in FIG. 9, molten metal is supplied from a ladle 91 to a hot water receiving chamber 92 of the holding furnace 90, and a liquid level adjusting chamber 97 communicating with a lower portion of the hot water receiving chamber 92. The molten metal level is controlled by the pressure of the gas pressure supply means 93 and the molten metal level sensor 94 to make the molten metal level of the molten metal discharge chamber 95 communicating with the lower part of the liquid level adjusting chamber 97 constant, and the molten metal is die cast by the electromagnetic pump 96. Supplying the machine. As shown in FIG. 10 instead of the gas pressure supply means 93, after the molten metal is supplied to the holding furnace 100 from the ladle 101, the weight 102 is moved up and down by a driving device (not shown) and controlled by the molten metal level sensor 103 to obtain a constant temperature. Keep the surface, electromagnetic pump 104
It can also be supplied to die casting machines. In addition,
Reference numeral 105 is a heater for heating the molten metal, and a weight 1
In the example shown in FIG.

[0004]

However, in the melting and holding furnace 70, when the ingot 71 is put into the melting chamber 72, or when the ingot 71 is melted by the gas burner 73, and in the holding furnaces 80, 90 and 100, When the molten metal is replenished with the ladles 81, 91 and 101, impurities such as oxides of the molten metal, solid materials of metal materials, dust, and fragments of furnace materials are mixed in the melting and holding furnaces 70, 80, 90 and 100, It will collect at the bottom. Electromagnetic pump 9
When it is conveyed to a die casting machine at 6 and 104 and cast-molded, oxides and impurities are mixed in the cast product, which causes a decrease in strength of the cast product, poor pressure resistance, mixing of solid matter, and the like.

The present invention has been made in view of the above points, and an object thereof is to provide a holding furnace for preventing the inclusion of oxides and impurities in a cast product.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a molten metal holding furnace for a die casting machine, which has a hot water receiving chamber as a molten metal inlet and a molten metal outlet as an outlet of the molten metal. In the above, there is provided a calming chamber for calming the molten metal between the hot water receiving chamber and the hot water discharging chamber, and an inert gas such as nitrogen or argon that floats oxides and impurities in the molten metal near the bottom of the hot water receiving chamber. A bubbling device that blows out gas bubbles was provided. In addition, the hot water receiving chamber has a level control means for controlling the level of the molten metal and a bubbling device for blowing bubbles due to an inert gas such as nitrogen or argon, which floats oxides and impurities in the molten metal, near the bottom part. The molten metal level control means is equipped with a molten metal heating means.
Further, the hot water receiving chamber has a molten metal level control means for controlling the molten metal level, and the molten metal level control means removes bubbles caused by an inert gas such as nitrogen or argon to float oxides and impurities in the molten metal. A bubbling device for blowing out and a molten metal heating means were attached. Here, the bubbling device is a cylinder that stores compressed gas, and a conduit that guides gas from the cylinder,
The metal molten metal holding furnace for a die casting machine is characterized in that it has an air diffuser attached to the same conduit and discharging gas discharged from a cylinder into the molten metal.

[0007]

[Function] While the molten metal flows into the hot water receiving chamber and is controlled and heated, the oxides and impurities in the molten metal flow out from the gas diffuser that is supplied from the cylinder of the bubbling device through the conduit, and form fine bubbles. As they are generated, they are aggregated into bubbles and float on the surface of the molten metal. After this, the cleaned molten metal is
Next, it is guided to the hot spring room or the hot spring room, and finally sent to the die casting machine.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a holding furnace according to the present invention will be described in detail below with reference to the accompanying drawings. In FIGS. 1 and 2, the inside of the holding furnace 10 is divided into a hot water receiving chamber 11, a calming chamber 12, and a hot water discharging chamber 13 in accordance with the order in which the molten metal flows out. An opening 14 connecting the hot water receiving chamber 11 and the calming chamber 12 and an opening 15 connecting the calming chamber 12 and the hot water discharging chamber 13 are provided in the lower part of the non-opposite side.

Further, an opening 13A is provided below the surface of the molten metal in the outlet direction of the molten metal discharge chamber 13, and is connected to a pipe 13B surrounding an electromagnetic pump 16 for transporting the molten metal, following a die casting machine (not shown). .

A hot water receiving toy 18 for gently inflowing the molten metal pumped by a ladle 17 from a melting furnace (not shown) is introduced into the hot water receiving chamber 11, and near the bottom of the hot water receiving chamber 11.
A bubbling device 19 that blows out an inert gas such as nitrogen gas or argon gas is provided.

The bubbling device 19 is a gas storage cylinder 20 for storing compressed gas, a conduit 21 for transporting the compressed gas following the gas storage cylinder 20, and a cylindrical diffuser for discharging the compressed gas transported by the conduit 21 into the molten metal. It is composed of 22.

The gas storage cylinder 20 is filled with nitrogen gas or argon gas, and the air diffusing tube 22 is made of a ceramic having 2,000 to 5,000 complete cylindrical pores having a diameter of several tens of microns per square centimeter. Has been formed. Reference numeral 23 is a heater for heating the molten metal.

With the above construction, the molten metal supplied from the ladle 17 passes through the hot water receiving toy 18 and the hot water receiving chamber 1
After flowing into No. 1, oxides and impurities in the molten metal are aggregated into fine nitrogen gas and argon gas bubbles generated from the diffuser pipe 22 of the bubbling device 19 and float on the surface of the molten metal, and are collected by a ladle (not shown). To be done. The cleaned molten metal is guided to the calming chamber 12 through the opening 14. The calmed molten metal is supplied to the molten metal outlet chamber 13 through the opening 15, passes through the opening 13A, and is sent to an unillustrated die casting machine by the electromagnetic pump 16 through the pipe 13B.

Next, a second embodiment will be described. Figure 3,
In FIG. 4, the inside of the holding furnace 30 is divided into a hot water receiving chamber 31 and a hot water discharging chamber 32 in the order in which the molten metal flows out.
Is provided.

Further, an opening 34 is provided below the surface of the molten metal in the outflow direction of the molten metal discharge chamber 33, and is connected to a pipe 35 surrounded by an electromagnetic pump 36 for transporting the molten metal, following a die casting machine (not shown). ing.

A hot water receiving toy 38 for gently inflowing the molten metal pumped by a ladle 37 from a melting furnace (not shown) is introduced into the hot water receiving chamber 31, and a bubbling device 39 is provided therein. The point that there is no difference from the first embodiment.

The major difference between the present embodiment and the first embodiment is that in order to keep the molten metal surface in the hot water receiving chamber 31 constant, a signal from a molten metal surface sensor 42 for detecting the molten metal surface is used to drive a driving device (not shown). A weight 40 for moving up and down in the hot water receiving chamber 31 is provided, and a penetration heater 41 for heating the molten metal is connected to the weight 40.

Next, a third embodiment will be described. Figure 5,
In FIG. 6, the inside of the holding furnace 50 is divided into a hot water receiving chamber 51 and a hot water discharging chamber 52 in the order in which the molten metal flows out. 53 is provided.

Further, an opening 54 is provided below the surface of the molten metal in the outlet direction of the molten metal discharge chamber 53, and is connected to a pipe 55 surrounded by an electromagnetic pump 56 for transporting the molten metal, following a die casting machine (not shown). ing.

A hot water receiving toy 58 for gently inflowing the molten metal pumped by a ladle 57 from a melting furnace (not shown) is introduced into the hot water receiving chamber 51, and a bubbling device 59 is provided therein. The point that there is no difference from the first embodiment.

The major difference between this embodiment and the previous two embodiments is that in order to keep the level of the molten metal in the hot water receiving chamber 51 constant, a signal from a molten metal level sensor 62 for detecting the molten metal surface is used to drive a drive device (not shown). By providing a weight 60 that moves up and down in the hot water receiving chamber 51, only the heater 61 for heating the molten metal inside the weight 60 and the tip portion 59A are projected into the molten metal, and the rear end portion 59B is left in the weight 60. The point is that the device 59 is provided.

Since the molten metal flows in the second and third embodiments in the same manner as in the first embodiment, a detailed description of cleaning the molten metal will be omitted.

[0023]

EFFECTS OF THE INVENTION According to the holding furnace of the present invention, it is possible to prevent the inclusion of oxides and impurities in the cast product, and to prevent the cast product from being deteriorated in strength and from having poor pressure resistance.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a view showing an AA cross section of the first embodiment of the present invention.

FIG. 3 is a plan view of a second embodiment of the present invention.

FIG. 4 is a diagram showing an AA cross section of a second embodiment of the present invention.

FIG. 5 is a plan view of a third embodiment of the present invention.

FIG. 6 is a view showing an AA cross section of a third embodiment of the present invention.

FIG. 7 is a diagram showing a conventional technique.

FIG. 8 is a diagram showing a conventional technique.

FIG. 9 is a diagram showing a conventional technique.

FIG. 10 is a diagram showing a conventional technique.

[Explanation of symbols]

 10 Holding Furnace 11 Hot Water Chamber 12 Calming Room 13 Hot Water Chamber 16 Electromagnetic Pump 17 Ladle 18 Hot Water Toy 19 Bubbling Device 20 Gas Storage Cylinder 21 Conduit 22 Diffuser 30 Retention Furnace 39 Bubbling Device 40 Weight 41 Infiltration Heater 42 Hot Water Sensor 50 Holding Furnace 59 Bubbling Device 60 Weight 61 Heater

Claims (5)

[Claims] 1. A molten metal holding furnace for a die casting machine, comprising a molten metal inflow receiving chamber as a molten metal inflow port and a molten metal outflowing outlet as a molten metal outflow port, and a molten metal between the receiving chamber and the molten metal outlet chamber. A metal holding furnace for a die casting machine, which is provided with a calming chamber for calming. 2. A bubbling device for blowing bubbles by an inert gas such as nitrogen or argon that floats oxides and impurities in the molten metal near the bottom of the hot water receiving chamber. Metal holding furnace for die casting machine. 3. A molten metal holding furnace for a die casting machine, which has a receiving chamber as an inlet for molten metal and an outlet chamber as an outlet for the molten metal, wherein the receiving chamber controls a molten metal surface. The molten metal control means has a bubbling device which blows bubbles by an inert gas such as nitrogen or argon that floats oxides and impurities in the molten metal near the bottom, and the molten metal control means is equipped with a molten metal heating means. A metal holding furnace for die casting machines characterized by the above. 4. In a molten metal holding furnace for a die casting machine, which has a receiving chamber as an inlet for the molten metal and an outlet chamber as the outlet for the molten metal, the receiving chamber controls a molten metal surface. It has a molten metal level control means, and the molten metal level control means is equipped with a bubbling device and a molten metal heating means for blowing bubbles by an inert gas such as nitrogen and argon for floating oxides and impurities in the molten metal. Metal holding furnace for die casting machines. 5. The bubbling device comprises a cylinder for accumulating compressed gas, a conduit for guiding the gas from the cylinder, and an air diffuser attached to the conduit for discharging the gas discharged from the cylinder into the molten metal. 2. The method according to claim 2, wherein
5. A molten metal holding furnace for a die casting machine according to any one of 1 to 4.