JP2001150124A - Molten metal supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a size of a whole apparatus in a molten metal supply apparatus of a die casting machine, etc., to reduce a manufacturing cost of the apparatus and effectively suppress oxidation of a molten metal. SOLUTION: A granulated metal 21 as raw material is stored in a hopper 1. The hopper 1 is connected to a rear end part of a barrel 2, a screw 3 is accommodated in the barrel 2, a melting container 10 is connected to the tip of the barrel 2. One of side walls of the barrel 2 (heat storing wall 12) is provided with a large heat capacity having a heat storing function, a heater 13 is arranged at its outside. A plunger 15 is accommodated in the melting container 10, an injection sleeve 19 of a die casting machine is connected under a flow out mouth 10a arranged to the bottom part of the melting container 10 through a stop valve 19. Raw material is sent by the screw 2 to the melting container 10 in a prescribed quantity, after melting in the melting container 10, its whole quantity is filled into a die.

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 apparatus used in a metal casting apparatus such as a die casting machine, and more particularly to an apparatus for effectively suppressing oxidation of molten metal.

[0002]

2. Description of the Related Art For example, in a conventional die casting machine, a raw material metal is melted in a large melting furnace, and the resulting molten metal is supplied to a piston pump, an electromagnetic hot water pump, a pressurized pump, or a ladle. Is supplied into the injection sleeve and injected into the mold cavity from within the injection sleeve by an automatic hot water supply device using the same.

[0003] When melting a raw material metal using such a large melting furnace, there are the following problems.

(A) The working environment is significantly deteriorated by high heat generated from a large amount of molten metal stored in a melting furnace.

(B) A large amount of energy is required to keep the molten metal in the melting furnace warm.

(C) The installation area of the melting furnace is large.

(D) The molten metal is easily oxidized.

(E) Dross and sludge are generated in large quantities,
Maintenance work such as removal of these is troublesome.

(F) It is difficult to measure the molten metal, and it is not easy to inject an accurate amount into the injection sleeve.

On the other hand, in a so-called in-line screw type injection molding machine, a raw material metal is melted in a barrel without using a large melting furnace. That is, a barrel in which a screw is stored is used, and the granular raw material is heated and melted while stirring with the screw, and the molten metal is stored at the tip. The molten metal stored in this way is
It is injected into the mold cavity from the tip of the barrel.

However, in the case of such an in-line screw type injection molding machine, since the material is transferred, stirred and melted in the barrel, the thermal load and the mechanical load acting on the barrel and the screw are large. To withstand it,
Barrels and screws are expensive.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of a conventional molten metal supply apparatus such as a die casting machine, and an object of the present invention is to reduce the size of the entire apparatus. At the same time, lower the production cost of the device, and
An object of the present invention is to provide a molten metal supply device capable of effectively suppressing oxidation of molten metal.

[0013]

SUMMARY OF THE INVENTION A molten metal feeder according to the present invention is a molten metal feeder for injecting a molten metal into a mold, wherein a granular material is supplied in an amount corresponding to a single injection amount. A raw material supply unit that is measured and supplied to the mold, and a melting unit that heats and melts the raw material supplied from the raw material supply unit and feeds the raw material sequentially to the mold for each supply. I do.

In the apparatus for supplying molten metal of the present invention, an amount of granular raw material corresponding to one injection amount is measured in the raw material supply section and supplied to the melting section without melting. The melting group heats and melts the raw material supplied from the raw material supply unit for each supply and sequentially sends out the raw material to the mold.

As described above, according to the apparatus for supplying a molten metal of the present invention, the molten metal can be poured into the mold immediately after the melting of the raw material, so that the oxidation of the molten metal can be reduced. Also, less energy is used to hold the melt.

According to the apparatus for supplying a molten metal of the present invention, the size of the entire apparatus is reduced, the energy consumption is reduced, and the working environment is deteriorated as compared with the case of using a conventional large melting furnace. Less.

Preferably, the raw material supply section is provided with a preheating means, and is configured to preheat the raw material measured and supplied to a temperature below the melting point. Thereby, the raw material supplied to the melting part is pre-ripened to a temperature immediately before the melting, the time required for melting the raw material in the melting part can be shortened, and the productivity of the apparatus can be increased.

The raw material supply section includes a hopper in which granular raw materials are stored, a cylindrical barrel connected to the hopper through a through hole formed in a side wall, and a barrel housed in the barrel. A screw having a rotating shaft on the top and transferring the granular raw material toward the tip of the barrel by a predetermined amount according to the amount of rotation, and in this case, a preheating means is provided around the barrel. It is preferable to provide a heater.

In the present invention, since the raw material is not melted in the raw material supply section, even if the raw material supply section is composed of a barrel and a screw, the barrel and the screw are more complicated than the conventional in-line screw type apparatus. The acting thermal and mechanical loads are small, and the cost of barrel and screw production and maintenance can be reduced.

Preferably, the melting section includes a heat storage section, and the material is heated and melted by using heat stored in the heat storage section. As described above, if the raw material is heated and melted using the heat stored in the heat storage group, the raw material can be melted in a short time by the heat stored in the heat storage unit even if a heating unit having a small capacity is used.

The melting portion is provided between the tip of the barrel and the mold, and includes a melting tank provided with a heater around the melting tank, and a valve provided at a lower portion of the melting tank for opening and closing an outlet. It may be further, in the melting tank,
A plunger for extruding the molten metal in the melting tank toward the outlet may be provided. In this case, it is preferable that at least a part of the wall surface of the melting tank is constituted by a heat storage wall.

As described above, if at least Ichiro of the wall surface of the melting tank is constituted by a heat storage wall, the raw material is heated and melted by the conductive heat and the radiant heat from the heat storage wall that has been heated and stored by the heater. Will be. Therefore, after the injection of the molten metal into the mold, even during the interval until the reception of the next raw material, by continuing to heat the heat storage wall with the heater, the unit is compared with the case of directly heating using the heater. The amount of heat input to the raw material per hour can be increased. As a result, the time required for one melting of the raw material can be reduced, and the melting step of the raw material can be stabilized. In addition, since such a heat storage wall is relatively easy to keep the temperature from the outside, the influence on the working environment can be suppressed as compared with the case where a conventional large melting furnace is used.

[0023]

FIG. 1 shows a schematic configuration of a molten metal supply apparatus according to the present invention. FIG. 2 is a longitudinal sectional view (AA sectional view of FIG. 1) of a melting tank portion constituting the melting portion. In the figure, 1 is a hopper, 2 is a barrel, 3 is a screw, 4
Are heaters for preheating, and these form a raw material supply section. Reference numeral 10 denotes a melting tank, 12 denotes a heat storage wall, 13 denotes a heater, 15 denotes a plunger, and 17 denotes a stop valve (valve), and these form a melting portion. Reference numeral 19 denotes an injection sleeve (hot water supply port) of the die casting machine.

A through hole 2a is provided in a side wall near the rear end (right end in the figure) of the barrel 2, and the hopper 1 is connected to the through hole 2a. In the hopper 1, a granular metal 21 as a raw material is stored. A screw 3 is housed in the barrel 2. Screw 3 is barrel 2
Has a rotation axis on the central axis. Around the barrel 2, a heater 4 for preheating is attached.

A melting tank 10 is connected to the tip (the left end in the figure) of the barrel 2. The melting tank 10 is configured by arranging two side walls 11 and 12 in parallel with each other and connecting them at their peripheral portions. Two side walls 11,
The distance between the twelve is set considerably smaller than their width and height. An opening 11a is provided near the center of one side wall 11 (right side in the figure).
The tip of the barrel 2 is connected to a. A heater 13 is arranged outside the other (left side in the figure) side wall 12. The side wall 12 (hereinafter, also referred to as a heat storage wall) is made of a thick steel plate, has a large heat capacity, and has a heat storage function.

A plunger 15 is accommodated in the melting tank 10. The plunger 15 is inserted into the melting tank 10 with a slight gap in a horizontal cross section, and is driven vertically between the two side walls 11 and 12. The distal end (lower end surface) of the plunger 15 is formed in a wedge shape, and is formed in a shape corresponding to the shape of the bottom of the melting tank 10 and the distal end of the plunger 15.

An outlet 10a is provided at the bottom of the melting tank 10, and an injection sleeve 19 of a die casting machine is connected (or opposed to) below the outlet 10a. A stop valve 17 is provided at the outlet 10a.

Next, a method of operating the molten metal supply apparatus will be described.

The granular raw material 21 is stored in the hopper 1. First, the screw 3 is driven to draw the raw material 21 from the hopper 1 into the barrel 2 and transfer the inside of the barrel 2 toward the tip. The raw material 21 is heated by the heater 4 for preheating while being transported in the barrel 1 by the screw 3. It reaches a temperature below about ℃. Next, the raw material 21 is put into the melting tank 10 from the tip of the barrel 2. Here, by controlling the rotation amount of the screw 3, a predetermined amount of the raw material 21 can be put into the melting tank 10.

In the melting tank 10, the heat storage wall 12 is previously heated by the heater 13 and is maintained at a high temperature. Immediately before receiving the raw material 21, the temperature of the heat storage wall 12 is set to a temperature equal to or higher than the melting point of the raw material (for example, by setting the liquidus temperature to 10 ° C.).
(Temperature about 0 ° C. higher). The raw material 21 is heated by conduction heat and radiation heat from the heat storage wall 12 in the melting tank 10 and is melted in a short time. When all the raw materials are melted, the plunger 15 is driven,
Open the stop valve 17 at the bottom. As a result, the entire amount of the molten metal 22 is injected into the injection sleeve 19, and the molten metal 22 is injected into the mold cavity by a plunger (not shown), similarly to a normal die casting machine.

In the above example, the heat storage wall 12 is formed of a flat plate having a large surface area so that heat can be easily transmitted from the heat storage wall 12 to the raw material 21. The area can be increased.

The above molten metal supply apparatus is particularly suitable as an automatic injection apparatus for a cold chamber type die casting machine. Not only the die casting machine but also a metal casting device such as a low-pressure casting device can be used. In that case, the molten metal 22 may be charged directly from the melting tank 10 into the mold.

In the above-described embodiment, an example in which the screw type is used for the raw material supply unit is shown. However, a constant capacity type raw material supply device such as a plunger type or a rotary blade type may be used.
Also, the melting unit may employ a melting device using various heating methods.

[0034]

According to the apparatus for supplying a molten metal of the present invention, the molten metal can be poured into a mold such as a mold or a mold immediately after the melting of the raw material, so that oxidation of the molten metal can be suppressed to a small extent. . As a result, a high quality cast product can be obtained. Also, less energy is required to hold the molten metal.

According to the apparatus for supplying a molten metal of the present invention, as compared with the case of using a conventional large melting furnace, the entire apparatus is reduced in size, energy consumption is reduced, and factors that deteriorate the working environment are also affected. Few.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a molten metal supply apparatus based on the present invention.

FIG. 2 is a longitudinal sectional view of a molten portion of the molten metal supply device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hopper, 2 ... Barrel, 2a ... Through-hole, 3 ... Screw 4 ... Heater 10 ... Melting tank, 10a ... Outflow port, 11 ... Side wall, 11a: opening, 12: heat storage wall (side wall), 13: heater, 15: plunger, 17: stop valve (valve), 19: injection sleeve (hot water supply port), 21: granular raw material, 22: molten metal.

Claims (8)

[Claims] 1. A metal melt supply device for injecting a metal melt into a mold, comprising: a raw material supply section for measuring and supplying a granular raw material to an amount corresponding to a single injection amount; A melting unit that heats and melts the raw material supplied from the supply unit and feeds the raw material to the mold sequentially for each supply. 2. The molten metal supply according to claim 1, wherein the raw material supply unit includes a preheating means, and is configured to preheat the measured and supplied raw material to a temperature equal to or lower than a melting point. apparatus. 3. The raw material supply section includes: a hopper in which granular raw materials are stored; a cylindrical barrel connected to the hopper through a through hole formed in a side wall; and a barrel accommodated in the barrel. 3. A molten metal supply according to claim 1, further comprising: a screw having a rotating pong on a central pong, and transferring the granular raw material toward the tip of the barrel by a predetermined amount according to a rotation amount. apparatus. 4. The metal melt supply device according to claim 3, wherein a heater as a preheating means is provided around the barrel. 5. The apparatus according to claim 1, wherein the melting unit includes a heat storage unit, and the material is heated and melted by using heat stored in the heat storage unit. 5. A metal melt supply device according to any one of the preceding claims. 6. The melting section is provided between the tip of the barrel and a mold, and has a melting tank provided with a heater around the melting section, and a valve provided at a lower portion of the melting tank for opening and closing an outflow roller. The molten metal supply apparatus according to any one of claims 1 to 5, comprising: 7. The molten metal supply apparatus according to claim 6, wherein a plunger for pushing out the molten metal melted in the melting tank toward an outlet is provided in the melting tank. 8. At least a part of the wall surface of the melting tank,
The metal evacuating / supplying apparatus according to claim 6, wherein the apparatus is constituted by a heat storage wall.