JP6820185B2 - Dissolution supply device for metal materials and decompression casting device using it - Google Patents

Description

The present invention relates to a technique of a melting and supplying device for a metal material and a vacuum casting device using the same. More specifically, the present invention is provided at a hot water supply port opened in an injection sleeve, and a molten metal in which a metal material is melted is injected into the injection sleeve. A melting and feeding device for the metal material supplied inside and a vacuum casting device using the same.

Conventionally, a casting method (die casting method) is known in which molten metal held in a melting furnace is supplied into an injection sleeve and a plunger inserted into the injection sleeve is operated to inject and fill the molten metal into a mold cavity. .. Further, in recent years, since the usual die casting method has a problem that gas such as air and oxide is easily entrained, the inside of the cavity is used as a technique for improving poor circulation and reducing cavities due to gas entrainment. A casting method (vacuum die casting method) in which the pressure is reduced and die casting is also being proposed.

As a conventional casting apparatus, for example, as disclosed in Patent Document 1, a mold, an injection sleeve for injecting and filling the cavity of the mold with molten metal, and a hot water supply port of the injection sleeve for holding the molten metal in a melting furnace are provided. A die casting machine consisting of a mold, an injection sleeve, etc. is integrally connected to the melting furnace via a molten metal pipe, and is equipped with a melting and supplying device, etc., which is supplied into the injection sleeve via the melting furnace. Is pumped up and the molten metal is supplied into the injection sleeve via the molten metal pipe. In such a configuration, by integrally connecting the die casting machine and the melting furnace in the melting supply device with a molten metal pipe, the molten metal temperature drops when the molten metal comes into contact with the atmosphere, and an oxide film, dissolved gas, etc. are generated. It prevents you from doing so.

However, in the above-mentioned configuration of the dissolution supply device, the surface area of the molten metal held in the large melting furnace is large and the amount of heat diffusion is large, so that the thermal efficiency is poor, and as a result, the amount of electricity and gas energy used increases and running. There was a problem that the cost increased. In particular, the molten metal is often retained even when the apparatus is stopped, such as on holidays or at night, so it is necessary to prevent hot water leakage due to damage to the melting furnace, etc., which complicates the equipment configuration of the dissolution supply apparatus. There was a problem that the equipment cost increased. Further, since the amount required for one casting at the time of pumping the molten metal from the melting furnace is measured by the time control of the electromagnetic pump, there is a problem that the accuracy of hot water supply to the injection sleeve is inferior.

On the other hand, as a conventional melting and supplying device, for example, as disclosed in Patent Document 2, an amount of metal material required for one casting is melted for each casting, and an amount of molten metal required for one casting is melted. A configuration has also been proposed in which only is supplied. Certainly, according to such a configuration, the amount of molten metal held in the melting furnace is small, the thermal efficiency is improved as compared with the melting supply device using a large melting furnace, and the device can be easily configured. However, since the melting furnace was tilted to supply the molten metal to the injection sleeve during hot water supply, it is not possible to sufficiently prevent the deterioration of the molten metal quality due to the temperature drop and the generation of oxide film and dissolved gas as described above. Can not.

Japanese Unexamined Patent Publication No. 2013-208646 Japanese Unexamined Patent Publication No. 2011-143444

Therefore, the present invention solves the above-mentioned conventional problems with respect to the melting and supplying device for metal materials and the vacuum casting device using the same, and melts and supplies metal materials capable of accurately supplying high-quality molten metal with a simple configuration. It is an object of the present invention to provide an apparatus and a vacuum casting apparatus using the apparatus.

The problem to be solved by the present invention is as described above, and next, the means for solving this problem will be described.

That is, in claim 1, in the metal material dissolution supply device which is arranged in the hot water supply port opened in the injection sleeve and supplies the molten metal in which the metal material is dissolved into the injection sleeve, it is fixed to the side surface of the injection sleeve. The housing to be installed and the pouring port housed in the housing and opened at the lower end are connected to the hot water supply port, and are made of an inner pit member made of a highly heat-resistant insulating material and a highly heat-resistant conductive material. A metal melting pit provided with an outer pit member arranged so as to cover the peripheral surface of the inner pit member, a metal material supply unit for supplying a metal material to the metal melting pit, and a metal material supply unit. A heat-melting part that melts the metal material supplied to the metal melting pit by induction heating, and a hot-melting part that is movably arranged in the housing and closes the pouring port of the metal melting pit at one end. It has a pouring port opening / closing part provided with an opening / closing rod, and by moving the opening / closing rod of the pouring port opening / closing part upward to open the pouring port of the metal melting pit, once with a die casting machine. It supplies the amount of molten metal required for casting.

In claim 2, the metal melting crucible is provided with a tubular receiving member that can be fitted to one end of the opening / closing rod at the pouring port.

In claim 3 , the pouring port opening / closing portion is provided with an opening / closing cylinder in which a cylinder rod is arranged downward at an upper position of the housing, and the opening / closing rod is connected to the opening / closing cylinder to melt the metal. It is arranged on the center line of the housing.

In claim 4 , the metal material supply unit includes a supply duct arranged in the housing and communicated with the internal space of the housing, and a weighing device connected to the supply duct to accommodate and discharge the metal material. Is provided so that the high temperature gas in the housing can be transferred to the inside of the supply duct and the measuring device.

In claim 5 , the dissolution supply device according to any one of claims 1 to 5 is used.

As an effect of the present invention, a high-quality molten metal can be accurately supplied with a simple configuration.

It is the schematic sectional drawing which showed the overall structure of the vacuum casting apparatus which concerns on one Example of this invention. It is the schematic sectional drawing of the dissolution supply apparatus of a metal material. It is an enlarged cross-sectional view of the pouring port of a metal melting crucible. It is the schematic sectional drawing of the melting supply apparatus of a metal material after a supply operation. It is a figure which showed the operation of the dissolution supply apparatus of a metal material. It is a flowchart which showed the dissolution supply method of a metal material. It is the schematic sectional drawing of the dissolution supply apparatus of the metal material of another Example. It is the schematic sectional drawing of the dissolution supply apparatus of the metal material of another Example.

Next, a mode for carrying out the invention will be described.

First, the overall configuration of the vacuum casting apparatus 1 of this embodiment will be outlined below.
As shown in FIG. 1, the vacuum casting apparatus 1 of this embodiment depressurizes the inside of the cavity 21 of the mold 20 of the die casting machine 2 and die-casts the metal material 10 (melted metal 11) melted by the melting supply apparatus 3. It is configured as a casting device for vacuum die casting, which is supplied to a machine 2 and injects a molten metal 11 into a cavity 21 under reduced pressure to cast a product.

As the metal material 10, any metal such as a magnesium alloy, copper or an alloy thereof, and an iron-based alloy is selected in addition to the aluminum alloy or the zinc alloy. The shape of the metal material 10 is not particularly limited, and mainly granular, pellet-shaped or ingot-shaped molded pieces, or irregularly shaped pieces or iron scraps having different shapes and sizes can be used.

The die casting machine 2 is provided with a mold 20, an injection sleeve 22 for injecting and filling the cavity 21 of the mold 20 with molten metal, a decompression device 23 for reducing the pressure inside the cavity 21 of the mold 20, and the like. The mold 20 includes a fixed mold 20a and a movable mold 20b, and both molds 20a and 20b form a cavity 21 for molding a die-cast product.

One end of the injection sleeve 22 is connected to the cavity 21, and a hot water supply port 24 to which the molten metal 11 is supplied from the dissolution supply device 3 described later is opened on the upper surface side of the outer circumference. Further, a plunger 25 is slidably inserted inside the injection sleeve 22, and the plunger 25 is connected to a drive device (not shown) such as a hydraulic cylinder device. The molten metal 11 is temporarily stored in the portion sandwiched between the mold 20 and the plunger 25 in the injection sleeve 22 (see FIG. 4 and the like).

The decompression device 23 is a device for discharging the air in the cavity 21 of the mold 20 to reduce the pressure. The decompression valve 26 is communicated with the cavity 21, and the decompression valve 26 is connected to the vacuum pump 28 via the vacuum tank 27. It is connected. In the vacuum distillation device 23, by opening the vacuum valve 26 and operating the vacuum pump 28, the air in the cavity 21 is discharged to the outside of the machine through the vacuum valve 26 and the vacuum tank 27.

Next, the configuration of the dissolution supply device 3 will be described in detail below.
As shown in FIGS. 2 to 4, the dissolution supply device 3 of this embodiment is arranged in a hot water supply port 24 opened in the injection sleeve 22, and the molten metal 11 in which the metal material 10 is dissolved is placed in the injection sleeve 22. It is a supply device, specifically, a metal having a housing 4 fixed to the side surface of the injection sleeve 22 and a metal pouring port 52 housed in the housing 4 and opened at the lower end thereof connected to the hot water supply port 24. The melting chamber 5 and the metal material supply device 6 for supplying the metal material 10 to the metal melting chamber 5 and the metal material 10 supplied to the metal melting chamber 5 by the metal material supply device 6 are melted by induction heating. It has a heat melting device 7 and a pouring port opening / closing device 8 or the like which is arranged in a housing 4 so as to be movable up and down and is provided with an opening / closing rod 80 which closes the pouring port 52 of the metal melting pit 5 at one end. Then, the opening / closing rod 80 of the pouring port opening / closing device 8 is moved upward to open the pouring port 52 of the metal melting pit 5, so that the molten metal 11 in the amount required for one casting is supplied by the die casting machine. It is configured in.

The housing 4 is configured such that a closed space 42 isolated from an external space is formed inside by a wall member 40 and a lid member 41, and a metal melting crucible 5 and heating are formed in the wall member 40 and the closed space 42. A melting device 7 is arranged, and a metal material supply device 6 and a pouring port opening / closing device 8 are arranged in the lid member 41 and the closed space 42. The wall member 40 and the lid member 41 are molded from a material having a higher melting point and higher heat resistance than the metal material 10, and in this embodiment, the induction heating coil 70 of the heating and melting device 7 is formed on the wall member 40 as described later. Is formed from cement material because it is installed internally.

The wall member 40 is formed in a mortar-shaped cross section in accordance with the shape of the metal melting crucible 5, which will be described later, and is connected to the pouring port 52 of the metal melting crucible 5 and the hot water supply port 24 of the injection sleeve 22 at the lower end. The mouth 43 is open. In the housing 4, the wall member 40 is airtightly fixed to the upper side surface of the injection sleeve 22 by the fixed frame type 44, and the pouring port 52 and the injection sleeve 22 of the metal melting crucible 5 described above pass through the communication port 43. The hot water supply port 24 is arranged so as to be located vertically above.

The housing 4 is provided with an inert gas supply device 30 that supplies an inert gas such as argon gas or nitrogen gas to the molten metal 11 held in the metal melting crucible 5. The gas supply device 30 is provided with a cylinder 31 as a gas supply source, a purging nozzle 32 and the like connected to the tank 31 via a valve or the like (not shown). The purging nozzle 32 extends into the closed space 42 via the lid member 41 and is immersed in the molten metal 11 held by the metal melting crucible 5, so that the inert gas can be purged into the molten metal 11. ing. By enabling the inert gas supply device 30 to purge the inert gas into the molten metal 11 in this way, the hydrogen gas precipitated in the molten metal 11 can be removed and the molten metal 11 can be kept in a healthy state. It is possible to prevent a new oxide film from being formed on the surface of the molten metal 11.

In addition, the housing 4 of this embodiment is provided with a molten metal level detection sensor 33 as a molten metal level detecting means. The molten metal level detection sensor 33 is provided with an electrode, a thermoelectric pair, or the like at the tip thereof, and is configured to be capable of detecting the height of the molten metal surface of the molten metal 11 as an electric signal by a control device (not shown), via a lid member 41. It extends into the closed space 42.

The metal melting crucible 5 has a cross-sectional mortar-shaped inner crucible member 50 made of a highly heat-resistant material and a cross-sectional mortar-shaped member 50 made of the same high-heat-resistant material so as to cover the peripheral surface of the inner crucible member 50. The metal material 10 is formed as a double crucible structure provided with the outer crucible member 51 of the above, and the metal material 10 supplied by the metal material supply device 6 is housed in the inner crucible member 50, and the heat melting device 7 described later. The melted molten metal 11 is held by the inner crucible member 50. The metal melting pit 5 can be formed of an insulating material such as ceramics or a conductive material such as copper or graphite. In this embodiment, the inner pit member 50 is mainly composed of alumina, silica or the like. The insulating material is more preferably formed than a material having excellent heat resistance and corrosion resistance to refractory metals, while the outer pit member 51 has conductivity mainly as a conductive material such as graphite or carbon. It is more preferably molded than a material having high thermal conductivity.

A pouring port 52 having a circular opening cross section is opened at the lower end of the metal melting crucible 5 (inner crucible member 50 and outer crucible member 51), and a communication port 43 of the housing 4 (wall member 40) described above is opened. It is connected to the hot water supply port 24 of the injection sleeve 22 via. In the metal melting crucible 5 of this embodiment, a tubular receiving member 53 that can be fitted to one end (closing portion 80a) of an opening / closing rod 80, which will be described later, is arranged at a pouring port 52, and the tubular receiving member 53 is made of metal. It is fitted so as to reach from the pouring port 52 of the melting crucible 5 to the communication port 43 of the housing 4 (wall member 40).

The tubular receiving member 53 is formed as a tubular body having a substantially circular cross section by using an insulating material such as ceramics or a conductive material such as copper or graphite, and has a spiral (female screw-shaped) concave groove 53a on the inner peripheral surface. Is engraved (see Fig. 3). By engraving the concave groove 53a in this way, the molten metal 11 held in the metal melting crucible 5 (inner crucible member 50) passes through the tubular receiving member 53 and passes from the pouring port 52 to the communication port 43. When the molten metal 11 is dropped and supplied via the tubular receiving member 53 (see FIG. 4 and the like), the molten metal 11 is swirled along the crucible groove 53a carved in the tubular receiving member 53, and the molten metal 11 is sent from the tubular receiving member 53 by an afferent vortex. The supply speed can be accelerated.

In the metal melting crucible 5, the outer periphery of the outer crucible member 51 is surrounded by the heat insulating material 45, and in a state of being housed in the closed space 42 of the housing 4, the heat insulating material 45 and the wall member 40 of the housing 4 The gap with the outer crucible member 51 is filled. By disposing the heat insulating material 45 in this way, the heat conduction between the metal melting crucible 5 and the wall member 40 is blocked, and the heat of the metal melting crucible 5 causes the induction heating coil 70 described later to be overheated. Can be prevented.

The metal melting crucible 5 is formed in a capacity capable of holding at least the amount of the molten metal 11 required for one casting in the die casting machine 2, and specifically, a predetermined amount to be held in advance. The molten metal 11 and the amount of the molten metal 11 required for one casting in the die casting machine 2 are combined to form a capacity that can be held. In the metal melting crucible 5 of the present embodiment, a predetermined amount of the molten metal 11 is held in advance, and the metal material 10 is supplied from the metal material supply device 6 while holding the molten metal 11 (see FIG. 5 and the like). The holding amount of the molten metal 11 is changed depending on the type and amount of the metal material 10 used, the amount of the molten metal 11 supplied to the die casting machine 2, and the like.

The metal material supply device 6 is a device for supplying the metal material 10 to the metal melting crucible 5, and specifically, the supply duct 60 and the supply duct 60 arranged on the lid member 41 of the housing 4. A measuring device 61 or the like for accommodating the metal material 10 and measuring and discharging the metal material 10 is provided so that the supply amount of the metal material 10 to be supplied to the metal melting crucible 5 can be arbitrarily adjusted. It is configured.

The supply duct 60 is formed in a tubular shape having a rectangular cross section, penetrates the lid member 41 of the housing 4, extends into the closed space 42, and has a metal material 10 discharged from the weighing device 61 at the open end. An opening end portion 60a for supplying to the metal melting duct 5 is formed. The supply duct 60 is arranged so that the opening end portion 60a is located above the metal melting crucible 5.

The weighing device 61 is configured as a weighing machine capable of weighing and discharging a predetermined amount of the metal material 10 from the stored and held metal material 10. As for the supply amount of the metal material 10 weighed and discharged from the measuring device 61, the amount of the metal material 10 corresponding to the amount of the molten metal 11 required for one casting by the die casting machine 2 is supplied to the metal melting crucible 5. Is set. However, the supply amount of the metal material 10 can be changed and adjusted depending on the type of the metal material 10 and the amount of the molten metal 11 supplied to the die casting machine 2.

In the metal material supply device 6, the internal space of the supply duct 60 and the closed space 42 of the housing 4 are communicated with each other, and the high temperature gas in the housing 4 (including the inert gas supplied by the inert gas supply device 30) is included. ) Is configured to be transferable to the inside of the supply duct 60 and the weighing device 61 via the open end 60a of the supply duct 60. By communicating the supply duct 60 of the metal material supply device 6 and the closed space 42 of the housing 4 in this way, the exhaust heat of the inert gas that has become hot through the molten metal 11 is utilized and held in the measuring device 61. The metal material 10 to be formed can be preheated to a temperature that does not melt.

The heating and melting device 7 is provided with an induction heating coil 70, a high frequency power supply 71 connected to the induction heating coil 70, and the like. The induction heating coil 70 is embedded in the wall member 40 of the housing 4, and extends spirally along the outer periphery of the metal melting crucible 5 (inner crucible member 50 and outer crucible member 51). The induction heating coil 70 is formed of an inner hollow tube material, cooling water is supplied to the inner hollow, and an insulating material such as ceramics is coated on the outer peripheral surface.

When the metal material 10 held in the metal melting chamber 5 is melted by the heating melting device 7, an alternating high frequency current is supplied from the high frequency power source 71 to the induction heating coil 70, and an alternating magnetic flux is applied to the induction heating coil 70. To generate. Since this alternating magnetic flux induces a vortex current in the metal material 10 and the outer crucible member 51, the metal material 10 is heated by resistance heat generation due to the generated vortex current and heat generation generated by hysteresis loss due to the alternating magnetic flux from the induction heating coil 70. At the same time, the outer crucible member 51 is heated. By heating the metal material 10 and the outer crucible member 51 in this way, the metal material 10 is directly and indirectly melted.

The heat melting device 7 is configured to not only melt the metal material 10 held in the metal melting crucible 5, but also to control the temperature of the molten metal 11 held in the metal melting crucible 5. As a heating control method by the heating melting device 7, for example, a high frequency power source is used so that the temperature of the molten metal 11 in the metal melting pit 5 detected by a temperature sensor (not shown) provided in the housing 4 becomes a predetermined temperature. By controlling the current frequency output from 71, the heating state by the induction heating coil 70 is controlled. In particular, in this embodiment, since the molten metal 11 is always held in the metal melting crucible 5, the temperature of the molten metal 11 is controlled by the heating and melting device 7 so as to reach a desired set temperature.

The pouring port opening / closing device 8 is provided with an opening / closing rod 80 that closes the pouring port 52 of the metal melting crucible 5 at one end, an opening / closing cylinder 81 that moves the opening / closing rod 80 up and down, and the like. By moving the opening / closing rod 80 upward, the pouring port 52 of the metal melting crucible 5 is opened, and the die casting machine 2 is configured to supply the molten metal 11 in an amount required for one casting (Fig.). 3).

The opening / closing rod 80 is arranged on the center line of the metal melting crucible 5, and a closing portion 80a of the lubrication port 52 is formed at one end, and the other end penetrates the lid member 41 of the housing 4 to form the opening / closing cylinder 81. It is connected. The closing portion 80a is formed to have substantially the same diameter as the tubular receiving member 53 arranged in the lubricating port 52, and the closing portion 80a is inserted and fitted into the tubular receiving member 53 to form the lubricating port 52. It will be closed. The opening / closing cylinder 81 is arranged with the cylinder rod 83 facing downward at a position above the housing 4 via a connecting member 82, and the other end of the opening / closing rod 80 is connected to the vertically expandable cylinder rod 83. ing.

Explaining the operation of the pouring port opening / closing device 8, first, the opening / closing cylinder 81 is operated, the cylinder rod 81a is extended downward, and the opening / closing rod 80 is moved downward, whereby the tubular receiving member 53 (pouring port 52). The closing portion 80a is fitted into the cylinder, and the lubrication port 52 is closed. In this state, the metal material 10 is supplied to the metal melting pit 5 by the metal material supply device 6, the metal material 10 is melted by induction heating in the heating melting device 7, and the molten metal 11 is added to the metal melting pit 5. It is retained (see FIGS. 2 and 5).

On the other hand, when the cylinder rod 81a is expanded and contracted upward and the opening / closing rod 80 is moved upward, the closing portion 80a is disengaged from the tubular receiving member 53 (pouring port 52) and the lubrication port 52 is opened. In this state, the molten metal 11 held in the metal melting crucible 5 is supplied from the pouring port 52 into the injection cylinder 22 via the hot water supply port 24 (see FIGS. 4 and 5). At this time, the pouring port opening / closing device 8 supplies the molten metal 11 in an amount required for one casting by the die casting machine 2 while leaving the molten metal 11 in the metal melting crucible 5.

The supply amount (residual amount) of the molten metal 11 in the pouring port opening / closing device 8 is the amount of the molten metal 11 discharged from the lubricating port 52 by driving and controlling the reciprocating operation of the cylinder rod 81a in the opening / closing cylinder 81 by an actuator or the like (not shown). (Or the amount of molten metal 11 remaining in the metal melting crucible 5) is adjusted. The residual amount of the molten metal 11 is changed depending on the type and amount of the metal material 10 used, the amount of the molten metal 11 supplied to the die casting machine 2, and the like.

Next, a method for dissolving and supplying the metal material 10 using the dissolution and supply device 3 of this embodiment will be described below with reference to FIGS. 5 and 6. In this embodiment, a cycle from melting the metal material 10 to supplying the molten metal 11 to the injection sleeve 22 (hereinafter, referred to as a dissolution supply cycle) will be described.

Here, the molten metal previously held in the metal melting crucible 5 is referred to as a holding molten metal 11a, and the amount of the molten metal required for one casting by the die casting machine 2 is referred to as a supply molten metal 11b, and is referred to as a holding molten metal 11a. The molten metal combined with the molten metal 11b for supply is called a total molten metal 11c (see FIG. 5).

First, in the metal material supply step S100, the metal material 11 is supplied to the metal melting crucible 5 by the metal material supply device 6. At this time, in the pouring port opening / closing device 8, the opening / closing cylinder 81 is operated and the opening / closing rod 80 is moved downward to close the pouring port 52 (cylindrical receiving member 53), and the metal melting crucible 5 is previously used. The holding molten metal 11a is held (see FIG. 5A). The holding molten metal 11a held in the metal melting crucible 5 is heated by the heating and melting device 7 to be adjusted to a predetermined temperature (preheating), and is held by the inert gas supply device 30 from the purging nozzle 32. The inert gas is purged in the molten metal 11a.

Then, in the metal material supply device 6, the amount of the molten metal required for one casting in the die casting machine 2 among the metal materials 10 preheated by the high temperature gas in the housing 4 and held in the measuring device 61. The amount of the metal material 10 corresponding to 11 is weighed and discharged, discharged from the opening end portion 60a of the supply duct 60, and housed in the inner crucible member 50 of the metal melting crucible 5 (see FIG. 5B).

In the melting step S110, the heating and melting device 7 controls the high-frequency power source 71 to change the heating state by the induction heating coil 70, and the metal material 10 is heated to the melting temperature and supplied to the metal melting pit 5. The metal material 10 is dissolved. In this way, the metal melting crucible 5 holds the total molten metal 11c, which is a combination of the holding molten metal 11a and the supply molten metal 11b in the amount required for one casting in the die casting machine 2 (FIG. 5). (C).

In the molten metal supply step S120, the opening / closing cylinder 81 is operated by the pouring port opening / closing device 8 to move the opening / closing rod 80 upward, so that the pouring port 52 (cylindrical receiving member 53) is opened and the metal melting crucible 5 is used. From the total molten metal 11c held in the die casting machine 2, the amount of molten metal required for one casting, that is, the molten metal for supply 11b, is discharged from the pouring port 52 while leaving the same amount of molten metal as the holding molten metal 11a. It is supplied to the injection sleeve 22 via the hot water supply port 24 (see FIG. 5D). When the pouring into the injection sleeve 22 is completed, the opening / closing rod 80 of the pouring port opening / closing device 8 is moved downward again, and the pouring port 52 (cylindrical receiving member 53) is closed.

In the dissolution supply device 3 of this embodiment, the above-mentioned dissolution supply cycle is continuously repeated to continuously supply the molten metal 11 in the amount required for one casting by the die casting machine 2 to the injection sleeve 22. Will be done. In the die casting machine 2, the molten metal 11 is supplied by the melting supply device 3 while the inside of the cavity 21 of the mold 20 is depressurized by the depressurizing device 23, and after the pouring into the injection sleeve 22 is completed, The plunger 25 is operated to inject and fill the cavity 21 with the molten metal 11.

As described above, the melting supply device 3 for the metal material 10 of the present embodiment is arranged in the hot water supply port 24 opened in the injection sleeve 22, and the molten metal 11 in which the metal material 10 is melted is supplied into the injection sleeve 22. In the melting and supplying device 3 of the metal material 10 to be used, the housing 4 fixed to the side surface of the injection sleeve 22 and the pouring port 52 housed in the housing 4 and opened at the lower end are connected to the hot water supply port 24 for metal melting. Heating that melts the metal material 10 supplied to the metal melting chamber 5 by the metal material supply device 6 and the metal material supply device 6 that supplies the metal material 10 to the metal melting chamber 5 and the metal melting chamber 5 by induction heating. It comprises a melting device 7 and a pouring port opening / closing device 8 which is arranged in the housing 4 so as to be movable up and down and is provided with an opening / closing rod 80 which closes the pouring port 52 of the metal melting pit 5 at one end. By moving the opening / closing rod 80 of the pouring port opening / closing device 8 upward to open the pouring port 52 of the metal melting pit 5, the die casting machine 2 supplies the molten metal 11 in the amount required for one casting. A high-quality molten metal 11 can be accurately supplied with a simple configuration.

That is, since the dissolution supply device 3 of this embodiment performs the dissolution supply cycle in a state of being fixed to the injection sleeve 22 of the die casting machine 2, the amount of the molten metal 11 held in the metal melting pot 5 is small. Compared with the conventional configuration using a large melting furnace, the thermal efficiency can be improved and the apparatus can be easily configured. Further, since the pouring port 52 of the metal melting pit 5 is connected to the hot water supply port 24 of the injection sleeve 22, the molten metal 11 comes into contact with the atmosphere during hot water supply, so that the molten metal temperature drops, an oxide film, a dissolved gas, etc. The molten metal 11 can be supplied by preventing the deterioration of the quality due to the occurrence of the above, and the molten metal 11 can be supplied only by moving the opening / closing rod 80 upward and opening the pouring port 52. Therefore, for example, an electromagnetic pump. It is possible to supply hot water with higher accuracy than the pumping type hot water supply method using.

In particular, in the metal melting crucible 5 of the present embodiment, since the tubular receiving member 53 that can be fitted with one end of the opening / closing rod 80 is arranged at the pouring port 52, one end of the tubular receiving member 53 and the opening / closing rod 80 It is possible to effectively prevent the molten metal 11 from leaking from the pouring port 52 and to protect the pouring port 52 to improve the life of the apparatus.

Further, the metal melting crucible 5 of the present embodiment is arranged so as to cover the peripheral surface of the inner crucible member 50 made of a highly heat-resistant insulating material and the inner crucible member 50 made of a highly heat-resistant conductive material. Since the outer crucible member 51 is provided, the metal material 10 housed in the inner crucible member 50 of the metal material 10 is directly melted by the heat melting device 7, and the temperature is high as the outer crucible member 51 generates heat. Since it can be indirectly melted through the inner crucible member 50, the metal material 10 can be efficiently melted.

Further, in the pouring port opening / closing device 8 of the present embodiment, an opening / closing cylinder 81 in which the cylinder rod 83 is arranged downward is provided at an upper position of the housing 4, and the other end of the opening / closing rod 80 is connected to the opening / closing cylinder 81. Since it is arranged on the center line of the metal melting crucible 5, the opening / closing rod 80 can be moved up and down with high accuracy with a simple configuration.

Further, the metal material supply device 60 of this embodiment accommodates a supply duct 60 arranged in the housing 4 and communicating with the closed space 42 of the housing 4, and a metal material 10 connected to the supply duct 60 for weighing and discharging. Since the measuring device 61 is provided and the high temperature gas in the housing 4 can be transferred to the inside of the supply duct 60 and the measuring device 61, the exhaust heat of the inert gas which has become high temperature is utilized through the molten metal 11. By preheating the metal material 10 held in the measuring device 61, the melting time of the metal material 10 in the metal melting pit 5 can be shortened, and the melting supply cycle can be shortened.

As described above, the configurations of the casting apparatus 1 and the dissolution supply apparatus 3 of the present embodiment are not limited to the above-described embodiments, and various changes can be made without departing from the object of the present invention.

That is, in the melting supply device 3 of the above-described embodiment, the metal melting crucible 5 is configured as a double crucible structure including an inner crucible member 50 and an outer crucible member 51 (see FIG. 2), but the metal melting crucible is such a crucible for metal melting. The shape and configuration of 5 are not limited to this, and for example, as shown in FIG. 7, the metal melting crucible 5 may be composed of one crucible member 54. In such a case, the crucible member 54 is preferably formed as a conductive material such as graphite or carbon, rather than a material having conductivity and high thermal conductivity.

Further, in the dissolution supply device 3 of the above-described embodiment, a tubular receiving member 53 that can be fitted with one end (closing portion 80a) of the opening / closing rod 80 is separately arranged at the pouring port 52 of the metal melting crucible 5. However, the arrangement configuration of the tubular receiving member 53 is not limited to this (see FIGS. 2 and 7), and may be integrally formed of the same material as the crucible member 54, for example, as shown in FIG. Alternatively, it may be integrally formed of the same material as any of the above-mentioned inner crucible member 50 and outer crucible member 51. Further, as the tubular receiving member 53, a spiral (female screw-shaped) concave groove 53a is engraved on the inner peripheral surface (see FIG. 3), but the shape of the tubular receiving member is limited to this. Instead, the concave groove 53a may not be provided, or the molten metal 11 may be formed in a suitable shape because the supply speed of the molten metal 11 from the tubular receiving member 53 is accelerated.

Further, the dissolution supply device 3 of the above-described embodiment is separately provided with a purging nozzle 32 constituting the inert gas supply device 30 for supplying the inert gas to the molten metal 11 held in the metal melting chamber 5 in the housing 4. However, the configuration of the inert gas supply device 30 is not limited to this (see FIG. 2). For example, instead of providing the purging nozzle 32, the opening / closing rod 80 is connected to the cylinder 31 to connect the opening / closing rod 80. It may be configured so that the inert gas can be purged into the molten metal 11.

Further, in the dissolution supply device 3 of the above-described embodiment, the opening / closing rod 80 of the pouring port opening / closing device 8 is arranged so as to be vertically movable by the opening / closing cylinder 81, but the operation of the opening / closing rod 80 is limited to this. Instead, for example, the opening / closing rod 80 may be configured to be further rotated about an axis when it is moved upward. With such a configuration, the molten metal 11 held in the metal melting crucible 5 is swirled when it is dropped and supplied through the tubular receiving member 53, and the supply speed is accelerated by the centripetal vortex. it can.

1 Decompression casting equipment 2 Die casting machine 3 Melting supply equipment 4 Housing 5 Crucible for metal melting 6 Metal material supply equipment (Metal material supply unit)
7 Heat melting device (heat melting part)
8 Pouring port opening / closing device (pouring port opening / closing part)
10 Metallic material 11 Molten metal 22 Injection sleeve 24 Hot water supply port 40 Wall member 41 Lid member 42 Closed space 43 Communication port 44 Fixed frame type 45 Insulation material 50 Inner crucible member 51 Outer crucible member 52 Pouring port 53 Cylindrical receiving member 60a Opening end 61 Weighing device 70 Induction heating coil 71 High frequency power supply 80 Opening and closing rod 80a Closing part 81 Opening and closing cylinder 82 Connection member

Claims (5)

In a metal material dissolution supply device that is arranged in a hot water supply port opened in an injection sleeve and supplies molten metal in which a metal material is dissolved into the injection sleeve.
A housing fixed to the side surface of the injection sleeve and
The inner crucible member housed in the housing and opened at the lower end is connected to the hot water supply port, and the inner crucible member is made of a highly heat-resistant insulating material and the inner crucible member is made of a highly heat-resistant conductive material. A metal melting crucible provided with an outer crucible member arranged so as to cover the peripheral surface ,
A metal material supply unit that supplies a metal material to the metal melting crucible,
A heating and melting unit that melts the metal material supplied to the metal melting crucible by induction heating in the metal material supply unit, and a heating and melting unit.
The housing is provided with a pouring port opening / closing portion that is vertically movable and is provided with an opening / closing rod that closes the pouring port of the metal melting crucible at one end.
A metal characterized in that the amount of molten metal required for one casting is supplied by a die casting machine by opening the pouring port of the metal melting crucible by moving the opening / closing rod of the pouring port opening / closing part upward. Material dissolution supply device. The metal melting and supplying device according to claim 1, wherein the metal melting crucible is provided with a tubular receiving member that can be fitted with one end of the opening / closing rod at the pouring port. The pouring port opening / closing portion is provided with an opening / closing cylinder in which a cylinder rod is arranged downward at an upper position of the housing, and the opening / closing rod is connected to the opening / closing cylinder on the center line of the metal melting crucible. The dissolution supply device for a metal material according to claim 1 or 2, wherein the metal material is disposed. The metal material supply unit is provided with a supply duct arranged in the housing and communicating with the internal space of the housing, and a weighing device connected to the supply duct to accommodate and discharge the metal material. The dissolution supply device for a metal material according to any one of claims 1 to 3, wherein the high temperature gas in the housing can be transferred to the inside of the supply duct and the measuring device. A vacuum casting apparatus using the dissolution supply apparatus according to any one of claims 1 to 4.

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