KR20160010531A - Hot chamber caster for aluminum alloy - Google Patents

Abstract

[PROBLEMS] To provide a hot chamber casting machine for an aluminum alloy which has a high casting speed and which does not cause a problem of a melting loss of an internal mechanism even when a molten aluminum alloy is used.
[MEANS FOR SOLVING PROBLEMS] A molten metal casting main body (120) made of ceramic is installed in a melting furnace (110). The valve body 150 is provided in the molten metal injection main part 120 at a position lower than the injection path 130 so that the pressure inside the molten metal injection main part 120 at the predetermined pressure Thereby controlling the application and removal of the gas pressure. When the pressurizing portion 160 applies gas pressure, the valve body 150 is moved in the closing direction so that the molten metal in the molten metal injection main portion 120 is diecast from the injection path 130 to the mold 200. When the pressurizing part 160 removes the gas pressure, the valve body 150 moves in the direction of opening, and a necessary amount of the molten metal is supplied to the inner space 123 for the next die casting.

Description

{HOT CHAMBER CASTER FOR ALUMINUM ALLOY}

The present invention relates to a hot chamber casting machine for die cast aluminum alloy and a die casting method using the same. In particular, the hot-chamber casting machine for aluminum alloys of the present invention avoids the problems of conventional hot-chamber casting machines and is a hot-chamber casting machine that is also used in the casting industry, which is considered to be unsuitable in conventional hot- .

As a method of molding a product or a part, a method of introducing a molten metal into a mold to obtain a desired shape is called casting, and a product manufactured by this manufacturing method is called "casting".

In the middle of a casting, die casting is a manufacturing method in which molten metal (molten metal) is press-injected (cast) into a die at a predetermined pressure by a piston.

Die cast casting machines are roughly divided into hot chamber casting machines and cold chamber casting machines. Both the hot chamber casting machine and the cold chamber casting machine melt the metal material for die casting and cast the metal material in a molten state into a forming die.

First, a conventional hot chamber casting machine will be described.

The hot-chamber casting machine is called a hot-chamber casting machine because the melting furnace and the casting machine are integrated, and the piston-cylinder injection portion and the introduction pipe are in the molten metal of the melting furnace and are heated together. The molten metal is extruded from the piston-cylinder injection portion immersed in the molten metal of the melting furnace, passes through the introduction pipe, reaches the mold, and is cast.

Fig. 6 is a view showing a basic structure of a conventional hot-chamber casting machine.

As shown in Fig. 6, the hot-chamber casting machine 10 is provided with the piston-cylinder injection portion 12 with respect to the melting furnace 11, and the inside thereof is filled with molten metal. The piston 13 is connected to and driven by a piston driving mechanism (not shown). The side surface of the piston-cylinder injection portion 12 is provided with a melt intake port 14 and an injection path 15 is connected from the end of the piston-cylinder injection portion 12. A mold 17 is provided outside the melting furnace 11 through a nozzle 16 in the vicinity of the tip of the injection furnace 15. The tip height of the nozzle 16 of the injection path 15 is provided at a position higher than the height of the molten metal surface in the melting furnace 11. [

The casting process of the conventional hot-chamber casting machine 10 shown in Fig. 6 is performed in the following order. The molten metal in the piston-cylinder injection portion 12 is extruded by the pressure of the piston 13 of the piston-cylinder injection portion 12. The pressure of the piston is usually 10MP to 30MP. For example, the pressure is generated by applying a hydraulic motor or a linear motor, not shown, to the piston. The molten metal is injected into the injection path 15 from within the cylinder by the pressure of the piston and is injected into the mold 17 through the nozzle 16. [ The mold 17 is separated to take out the molded product from the inside. Air may start to flow backward from the nozzle 16 and the injection path 15 as the piston 13 rises but if the tip end of the piston 13 is located above the molten metal intake port 14, The molten metal flows into the piston-cylinder injection portion 12 from the molten metal inlet 14 of the molten metal in the molten metal 11. Since the tip height of the nozzle 16 is higher than the height of the molten metal bath of the melting furnace 11, the molten metal introduced from the molten metal inlet 14 does not overflow from the nozzle 16 and the height of the pressure surface of the piston 13 The molten metal is filled.

A casting machine in which a molten metal injection portion is located inside a melting furnace, has a structure different from the above basic structure. For example, there is one disclosed in Japanese Patent Application Laid-Open No. 2004-122134.

The feature of the hot chamber casting machine 10 shown in Fig. 6 is that the hot water casting process of the molten metal into the piston-cylinder casting section 12 is automatically performed in accordance with the piston movement of the piston- cylinder casting section 12 in the melting furnace 11 The casting cycle is faster than the cold chamber casting machine.

Further, in the hot chamber casting machine shown in Fig. 6, there is a point that there is no suction of air from outside because the casting portion 12 which is the path of the die casting is in the molten metal. When the air enters, a cavity (air hole) is formed in the die cast product, causing a problem with the product. However, the hot chamber casting machine 10 has cavities in the die cast product since air does not enter the piston- There is little problem.

Further, since the injection pressure may be lower than that of the cold chamber casting machine, the mold 17 is not excessively loaded.

Next, a conventional cold chamber casting machine will be described. In the cold chamber casting machine, the melting furnace and the casting machine are separated, and the molten metal is poured into the casting machine outside the melting furnace by pouring one shot of the molten metal from the melting and casting outside the melting furnace. A casting machine is provided outside the melting furnace, and is called a cold chamber casting machine since it is not heated.

Fig. 7 is a view showing the basic structure of a conventional cold chamber casting machine 20. Fig.

7, the cold chamber casting machine 20 is provided with an extrusion molding machine 24 composed of a sleeve 22 and a plunger 23 outside the melting furnace 21, and a plunger 23 is provided with a pressing device 27 And is connected and operated. A mold 25 is provided at the tip of the sleeve 22. In addition, there is a ladle 26 for pouring molten metal from the melting furnace 21.

The casting process of the conventional cold chamber casting machine 20 shown in Fig. 7 is performed in the following order. As shown in Fig. 7 (a), the molten metal in the melting furnace 21 is poured into the ladle 26, and the molten metal for one shot is injected into the sleeve 22. Next, as shown in Fig. 7 (b), a predetermined amount of molten metal is injected into the sleeve 22, press-fitted into the plunger 23, and press-fitted into the mold 25 to be molded. The pressure of the plunger 23 is conventionally 60MP to 100MP. For example, the pressure is generated by applying to the plunger 23 by a hydraulic or linear motor (not shown).

Here, as a feature of the cold chamber casting machine 20, it is possible to cope with diecasting using a metal material having a high melting point. The cold chamber casting machine 20 shown in Fig. 7 has the melting furnace 21 and the extrusion molding machine 24 which is a casting machine separate from each other even if a metal material having a high melting point such as an aluminum alloy or a copper alloy is used. There is no need to be exposed to the high temperature of the melting furnace 21, and there is no possibility that these parts are molten. Therefore, it is possible to die-cast using a material that can melt a casting machine component, such as a metal material having a high melting point or an aluminum alloy melt.

Another feature of the cold chamber casting machine 20 is that it is easy to cope with the molding of a large sized product using a large mold. The casting machine itself is enlarged to form a large size, but if the casting mechanism is contained in the melting furnace as long as it is a hot chamber type, the melting furnace becomes considerably large. In this respect, it is possible to reduce the size of the melting furnace because the melting furnace and the casting machine are separately provided in the cold chamber die casting.

Patent Document 1: Japanese Patent Application Laid-Open No. 2004-122134

The conventional cold chamber casting machine 20 is disadvantageous.

First, in the conventional cold chamber casting machine 20, there is a problem that the casting speed is relatively low. In the conventional cold chamber casting machine 20, an operation of pouring from the melting furnace 21 to the ladle 26 and injecting it into the sleeve 22 is necessary. Further, in order to surely remove the air to be described later, it is necessary to carefully press the plunger 23 slowly. Therefore, there is a problem that the casting time is prolonged.

Next, in the conventional cold chamber casting machine 20, air may be mixed into the die casting product, which may cause a problem that a cavity (wind hole) enters. Since the conventional cold chamber casting machine 20 is provided with the extrusion molding machine 24 in the air, air is easily mixed into the sleeve 22, and air tends to be mixed in the molten metal. If air is mixed in the molten metal, die casting in the mold 25 results in the formation of an air hole in the cast product, resulting in cavities. Therefore, countermeasures against the cavity of the product such as the vacuum casting method and the PF method (foreprising method) are established, but all of them are troublesome.

Next, in the conventional cold chamber casting machine 20, there is a fear that the metal is ruptured in the molded cast product. In the conventional cold chamber casting machine 20, since the extrusion molding machine 24 is installed in the air, the aluminum alloy residue remaining in the sleeve 22 after the extrusion by the plunger 23 is easily cooled and dissipated, There may be a case where a small lump piece is formed on the wall surface or each corner portion but may be extruded from the plunger 23 and die-cast into the mold before completely integrated with the molten metal poured in the next die casting. Therefore, there is a problem that a casting product is produced in a state where a small lump piece is mixed. Since the temperature of the sleeve 22 is generally lower than the melting point of the aluminum alloy, when the molten aluminum alloy is warmed into the sleeve 22 by the ladle 26, the molten aluminum alloy partially solidifies, And the molding is performed in a state where the solid content is dispersed in the product. This is commonly referred to as a chill layer, which makes the product strength unstable.

As described above, there is a disadvantage in the cold chamber casting machine, and in particular, the hot casting casting machine is excellent in paying attention to the fact that the casting speed is high and the casting pressure is low.

However, the conventional hot-chamber casting machine 10 has a great disadvantage.

It is a problem that in the conventional hot-chamber casting machine 10, an aluminum alloy can not be used. For example, when the aluminum alloy is dissolved in the melting furnace, the melting furnace 11, the piston-cylinder injection portion 12, the nozzle 16 and the like are made of an iron-based alloy, Is lost. Not only iron-based alloys but also most metals are eroded by aluminum alloys and protected by nitriding, spraying, etc., and satisfactory results can not be obtained.

Therefore, there is a demand for a practical hot-chamber casting machine capable of casting using an aluminum alloy by improving the hot-chamber casting machine.

Here, an improved sand type low-pressure casting machine different from the basic structure shown in Fig. 6 is known. In place of the piston-type piston-cylinder injection portion 12, the molten metal is extruded using the gas pressure. Further, in the melting furnace, most of the portion to be the injection-molding furnace is provided on the melting furnace simply by setting the cylinder of the stoke.

Fig. 8 is a sand casting low-pressure casting machine disclosed in Japanese Patent Application Laid-Open No. 2004-122134. The numbers in the drawings are numbers used in the drawings of Japanese Patent Application Laid-Open No. 2004-122134 as they are, and they are not related to other numbers in this specification.

As shown in Fig. 8, this manufacturing apparatus has a furnace body 1 and a melting furnace 3 in which molten metal 2 is stored. The main body 1 is provided with a heating device 8 such as a gas burner for heating the melting furnace 3. A mold die 12 for mounting a die 11 is provided on the upper side of the main body 1. The lid member 4 is provided with a pressurized gas supply port 6 for supplying a pressurized gas 5 to the inside of the melting furnace 3 at a low pressure is formed in the lid member 4 . A pressurized gas supply means (7) is connected to the pressurized gas supply port (6). A stock 21 is set up in the molten metal and a stock 33 is set up through the molten metal pit 29 on the upper side and connected to the die 11. Further, a bath surface sensor 34 is provided.

As the casting process, first, the air in the cavity 16 in the casting die 11 is replaced with the oxidation preventing gas or the combustion preventing gas 28 by the oxidation preventing gas or the combustion preventing gas 28 in the stock 21. Next, a chamber 29 serving as a molten metal cavity is formed through a stock 21 formed on the molten metal by applying pressure at a low pressure by the pressurized gas 5 to the molten metal surface of the molten metal 2 stored in the melting furnace 3, , The molten metal 2 is pushed up to the cavity 16 of the die 11 through the stock 33. When the light metal melt 2 is filled in the cavity 16, the light metal melt 2 in the cavity 16 is solidified as it is.

As described above, the molten metal in the melting furnace 3 is pushed up by using the pressurized gas 5 by the pressurized gas supply means 7, and the molten metal is press-fitted into the mold. Thus, the mechanism system such as the piston is not used.

However, there is a problem to be solved also in the low-pressure casting machine of Fig.

First, in the low-pressure casting machine shown in Fig. 8, it is still insufficient to handle the aluminum alloy metal material. The molten metal is at a high temperature and the metal parts such as the stock 21, the molten metal 29, and the stock 33 are made of high-temperature aluminum There is no change in that it is exposed to the alloy, and also a problem of melting loss occurs.

Next, the casting low-pressure casting machine shown in Fig. 8 has a problem in terms of casting speed. In the structure shown in Fig. 8, it is necessary to apply pressure to the entire liquid surface of the molten metal in a large melting furnace in the low-pressure casting method to push the molten metal up and hold it in the molten metal pit 29 in the melting furnace. It is necessary to adjust the liquid surface height of the molten metal, so that there is a problem that the casting cycle is delayed compared with the basic type of Fig. Therefore, it is necessary to be careful in that it is performed while sensing the rising position of the molten metal surface by the molten metal surface sensor 34. In addition, when the molten metal is filled in the die 11, pressure is applied to the entire liquid surface of the molten metal in the large melting furnace, and the molten metal is injected into the die 11, so that it is difficult to control the pressure applied to the entire liquid surface of the molten metal. So, pressurization needs to be done carefully. Originally, in a hot-chamber casting machine, diecasting can be performed so that the casting can be performed with a single shot in accordance with the piston cycle, which is problematic in terms of casting speed.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a hot-chamber casting machine for an aluminum alloy which has a high casting speed and which does not cause a problem of malfunction even when a molten aluminum alloy is used The purpose.

In order to achieve the above object, the hot-chamber casting machine for an aluminum alloy according to the present invention comprises a melting furnace for containing molten metal, a molten metal casting main portion formed of ceramics installed in a melting furnace, A valve provided at a lower end of the injection path in the molten metal injection main section for opening and closing a passage between the inside of the melting furnace and the internal space of the molten metal injection main section; And a pressurizing portion for controlling application and removal of gas pressure of a predetermined pressure with respect to the inner space of the molten metal injection main portion. When a gas pressure is applied to the inner space of the molten metal discharge main portion of the pressurizing portion, , The molten metal in the molten metal injection main cylinder is diecast to the mold in the injection furnace and the pressurized portion is injected into the inner space of the molten metal injection main cylinder When the gas pressure is removed by the hot chamber casting machine for aluminum alloys, it characterized in that the molten metal in the required amount in the following die-casting in, yiyeoseo moved in a direction opening the valve body of the molten metal the melting furnace being supplied to the main injection cylinder.

With the above arrangement, in the hot-chamber casting machine for an aluminum alloy according to the present invention, since the member provided in the melting furnace is a molten metal casting main portion made of ceramic, there is no melt in the aluminum alloy. Further, in the hot-chamber casting machine for an aluminum alloy according to the present invention, the gas pressure applied by the pressurizing portion only presses the small hot-dippered surface of the molten metal injection main cylinder portion, The die casting speed can be increased.

Further, in the conventional piston-cylinder system, since high precision is required for the wall surface of the piston and the cylinder, the manufacturing cost is high, and measures for deformation and loss of the wall surface are required even after maintenance after maintenance. Since the pressure is applied to the cylinder by using the gas pressure, the deformation and the error of the wall surface in the cylinder do not become a problem, and the manufacturing cost of the cylinder can be reduced, and maintenance after the operation can be easily performed.

Next, in the above configuration, a wall surface structure in contact with the outer wall side of the molten metal discharge main cylinder portion, which is a ceramic product, is provided in the melting furnace so that the molten metal discharge main cylinder portion is fixed in the horizontal direction in the melting furnace, It is preferable that the molten metal injection main cylinder is fixed in the vertical direction in the melting furnace by providing a flange and fixing the flange and the molten metal injection main cylinder bottom wall face.

Here, the valve body is a ball valve, and the lower inner surface of the molten metal injection main cylinder is shaped like a mortar so that the ball valve can easily be connected to the conduction hole. A conduction hole smaller than the diameter of the ball valve is opened at the lowermost portion of the mortise- Structure is preferable.

In the case of a ball valve, it is possible to reliably close with a pressure from the upper side, and to open reliably when the pressure from the upper side becomes a negative pressure. If the ball valve is provided in the conduction hole, the flow of the molten metal in the melting furnace can be controlled. Further, even when the molten metal is supplied, an amount of molten metal suited to the molten metal consumed in the previous die casting can be supplied for the next die casting.

In addition, it is preferable to provide a gas decelerator for decelerating the gas velocity protruding from the pressurizing portion by application of the gas pressure to the inner space of the molten metal injection main cylinder portion. When the gas flow leaks to the inside of the molten metal injection main cylinder, droplets are generated on the surface of the molten metal inside, or the molten metal flows, and the flow of the flowing gas is decelerated. Examples of the gas decelerating portion include a plate material, a labyrinth, a damper, and the like provided at a position opposed to the gas introducing pipe.

In order to prevent the wave of the molten metal in the molten metal injection main portion and the scattering of the molten metal during application of the gas pressure, the molten aluminum alloy has a smaller specific gravity than the solid-phase oxide or aluminum alloy molten metal capable of coming into contact with the air, It is preferable that the lid-shaped object made of porous aluminum or the like which is not subjected to the melting of the molten metal is allowed to run on the molten metal surface inside the molten metal injection bore.

It is preferable that the pressurizing portion is provided with a gas tank, an electromagnetic valve, and a gas introducing pipe. The opening and closing operation of the electromagnetic valve is fast, and the amount of the gas to be applied can be accurately controlled by the opening and closing operation of the electromagnetic valve.

In the hot-chamber casting machine for an aluminum alloy according to the present invention, the member provided in the melting furnace is a molten metal casting main portion, a nozzle and a ball valve made of ceramic. Since the portion in contact with the aluminum alloy in the melting furnace is coated with ceramic paint, The aluminum alloy can be used as a metal material.

Further, in the hot-chamber casting machine for aluminum alloy according to the present invention, the gas pressure applied by the pressurizing portion merely presses the small hot-dippered surface of the molten metal injection main cylinder portion, Can speed up.

In addition, in the conventional piston-cylinder system, high precision is required for the piston and the cylinder wall surface, and manufacturing cost is high, and countermeasures such as deformation and loss of the wall surface are required in maintenance after maintenance. However, The deformation and errors of the wall surface in the cylinder do not become a problem and the production cost of the cylinder can be reduced and the maintenance after the operation can be also simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view schematically showing a configuration example of a hot chamber casting machine 100 for an aluminum alloy according to the present invention. FIG.
2 is a view showing an initial state of a casting cycle of the hot-chamber casting machine 100 for an aluminum alloy according to the present invention.
3 is a view showing a first step of a casting cycle of the hot-chamber casting machine 100 for an aluminum alloy according to the present invention.
4 is a view showing a second step of a casting cycle of the hot-chamber casting machine 100 for an aluminum alloy according to the present invention.
5 is a view showing a state in which the casting of the hot-chamber casting machine 100 for an aluminum alloy of the present invention is completed and the casting cycle is restored to an initial state.
6 is a view showing a basic structure of a conventional hot-chamber casting machine.
7 is a view showing a basic structure of a conventional cold chamber casting machine.
Fig. 8 is a casting type low pressure casting machine disclosed in Japanese Patent Application Laid-Open No. 2004-122134.

Hereinafter, an embodiment of the hot-chamber casting machine for aluminum alloy of the present invention will be described with reference to the drawings. It should be noted, however, that the technical scope of the present invention is not limited to the specific use shown in the following embodiments, and the shape, dimensions and the like.

Example 1

1 is a view schematically showing an example of the configuration of a hot chamber casting machine 100 for an aluminum alloy according to the present invention.

In Fig. 1, each member is shown in longitudinal section so that the structure inside can be easily understood. In FIG. 1, the features of the members are shown for easy understanding, only the members necessary for understanding the present invention are shown, and some other members are not shown.

1, the hot-chamber casting machine 100 for an aluminum alloy includes a melting furnace 110, a molten metal discharge main portion 120, an injection path 130, a nozzle 140, a valve body 150, (160). Also, a mold 200 is shown together.

The melting furnace 110 is provided with a heating device 111 and a crucible 112 for storing a molten metal dissolved in a metal material. A lid member 113 is provided on the upper surface of the crucible 112 and an opening 116 is formed in a part of the lid member 113 to supply the aluminum alloy material consumed by the casting in the opening 116. [ The lid member 113 is provided with an upper installation concave portion 117 in which the upper portion of the molten metal injection main cylinder 120 is received. Here, the molten metal is a molten metal in which an aluminum alloy is dissolved.

1, the crucible 112 of the melting furnace 110 is provided with a fixing portion 114 for fixing the molten metal ejecting main portion 120 internally from the inside thereof, and the fixing portion 114, A lower mounting concave portion 118 is provided.

Further, a nozzle 140 for drawing the injection path 130 into a mold is provided.

The fixing portion 114 is a member for stably fixing the molten metal injection main portion 120 in the crucible 112 and is fixed in contact with the outer wall surface and the member of the molten metal injection main portion 120. 1, a flange 122 is provided at the upper end of the molten metal discharge main cylinder 120, and an upper side of the molten metal injection main cylinder 120 is connected to the upper mounting recess 117 by a flange 122 And is fixed so as to surround the side surface and the upper surface of the flange 122 of the molten metal injection main cylinder portion 120 because the gas pressurizing portion 160 is in contact with the upper surface. Therefore, the upward movement of the molten metal discharge main portion 120 in the upper direction and the movement in the horizontal direction can be restricted. A lower wall surface 126 is formed in a lower portion of the molten metal injection main part 120 and a fixing part 114 fitted to the lower installation recess part 118 is formed on the lower wall surface of the molten metal injection main part 120 126 from outside. Therefore, the movement in the downward direction and the movement in the horizontal direction in the vicinity of the lower portion of the molten metal injection main portion 120 can be restricted. As described above, the molten metal injection main portion 120 is stably fixed by the fixing portion 114 because the upper and lower portions of the molten metal injection main portion 120 are restricted from moving in the vertical direction and moving in the horizontal direction.

The molten metal injection main portion 120 is a ceramic cylinder formed in the crucible 112 of the melting furnace 110. It is preferable to select a ceramic product that has excellent heat resistance and does not melt or break even a molten aluminum alloy.

The shape of the molten metal injection main portion 120 is not limited, but is assumed to be as shown in Fig. In the configuration example of Fig. 1, a flange 122 protrudes from an upper end with respect to a cylindrical main body portion 121. The inner space of the main body portion 121 is 123. On the bottom surface of the main body portion 121, there is provided a bottom surface portion 124 shaped like a mortar, and a conduction hole 125 is provided at the lowermost side thereof. The conduction hole 125 is provided with a valve body 150 for controlling opening and closing.

A lower wall surface 126 extending downward from the outer wall face of the main body portion 121 is disposed near the bottom face of the main body portion 121 and surrounds the bottom wall 127 under the bottom face of the main body portion 121, At least a part of the lower wall surface 126 is provided with an opening 128 for introducing the molten metal into the bottom space 127. Through this opening 128, the molten metal continues to the bottom space 127. As described above, the conduction / interruption of the internal space 123 and the bottom space 127 is controlled through the opening / closing operation of the valve body 150.

1, the gas decelerating section 129 is provided in the vicinity of the upper side of the inner space 123 of the molten metal ejecting main cylinder section 120. The gas decelerating section 129 is a member for decelerating the gas velocity entering from the gas introducing pipe 164 by application of the gas pressure of the pressing section 160 to be described later. The structure of the member such as a simple plate member, a damper, and a labyrinth pipe in which the passage of the conduction pipe is curved in the form of a vine in the inside is not particularly limited. This gas decelerating portion 129 prevents the gas flow from flowing into the molten metal ejection main portion 120 so as to rush against the surface of the molten metal to generate a droplet or cause a wave to strike the molten metal injection main portion 120 Can be suppressed.

The injection path 130 is a path provided on the side surface of the molten metal injection main section and connected to the internal space 123 of the molten metal injection main section 120. The internal space 123 of the molten metal injection main section 120 is connected to the pressurizing section The molten metal which is pressed by the gas application of the molten metal 160 is diecast to the mold 200 through the injection path 130.

The nozzle 140 is a member provided in the vicinity of the tip of the injection path 130 and connected to the mold 200. The molten metal is diecast from the nozzle 140 into the mold 200. The nozzle 140 is guided to the outside of the crucible 112 through the injection path guide portion 115 and connected to the mold 200.

The valve body 150 is installed at a position lower than the injection path 130 in the molten metal injection main part 120 and is arranged in the crucible 112 of the melting furnace 110 and in the internal space 123 of the molten metal injection main part 120 And the like. In the configuration example of Fig. 1, the valve body 150 is a ball valve. As described above, the bottom surface 124 of the inner space 123 of the molten metal injection main body 120 is formed in a truncated cone shape, and the ball valve is easily connected to the through hole 125. The through hole 125 is smaller than the diameter of the ball valve and the ball valve 125 is closed so that the ball 125 is closed.

The crucible 112 of the melting furnace 110 and the inner space 123 of the molten metal ejection main body 120 are blocked while the valve body 150 is pressed and the movement of the molten metal between them is lost. Since the valve body 150 is provided at a lower position than the injection path 130, conduction between the internal space 123 of the molten metal injection main portion 120 and the injection path 130 is maintained. As a result, The molten metal flows toward the injection path 130 in a state in which the valve body 150 is closed by applying pressure from the upper side to the injection valve 150.

On the other hand, when the internal space 123 of the molten metal injection main portion 120 becomes atmospheric pressure by the operation of the solenoid valve 163, as will be described later, The pressure applied to the lower surface of the valve body 150 is lower than the pressure applied to the lower surface of the valve body 150 because the molten metal in the inner space 123 is die- The valve body 150 is pushed up to the upper side. When the valve body 150 is pushed up, a clearance is formed between the conduction hole 125 and the valve body 150 and a gap is formed between the crucible 112 of the melting furnace 110 and the internal space 123 of the molten metal injection / Lt; / RTI > When the valve body 150 is opened, the upper surface of the molten metal in the inner space 123 of the molten metal injection main unit 120 is substantially equal to the upper surface of the molten metal in the crucible 112 until the pressure difference therebetween is eliminated, The molten metal flows into the inner space 123. In addition, since the valve body 150 is heavy, it is necessary to consider the influence of the weight of the valve body 150.

The pressing portion 160 is a portion for controlling the application and removal of the gas pressure of the predetermined pressure to the inner space 123 of the molten metal injection main portion 120.

1, the gas pressurization portion 160 is configured to include a high-pressure pump 161, a gas tank 162, a solenoid valve 163, a gas introduction pipe 164, and a scatter prevention cap 165 have.

The high-pressure pump 161 is a device for sending high-pressure gas into the gas tank 162. The gas tank 162 sends a high pressure gas to the inner space 123 of the molten metal injection main unit 120 at once by opening and closing the solenoid valve 163 as described later, to be.

The gas pressure accumulated in the gas tank 162 is set to a gas pressure which is 30MP at 10MP which is generally equivalent to the piston pressure required for the hot chamber casting machine when the solenoid valve 163 is opened. It should be noted that since the space in the inner space 123 of the molten metaljecting main cylinder 120 immediately before opening the solenoid valve 163 is filled with the molten metal at a pressure of atmospheric pressure (about 0.1 MP) The atmospheric pressure component in the inner space 123 and the pressure component in the gas tank 162 are combined and applied to the melt surface when the gas in the gas tank 162 is introduced into the inner space 123 by opening the inner space 163. That is, since the high gas pressure of the initial accumulation of the gas tank 162 is reduced by the atmospheric pressure in the inner space 123, and the applied pressure is applied to the surface of the molten metal, the gas pressure accumulated by the gas tank 162 is injected It is necessary to set a larger value in consideration of the reduction of the atmospheric pressure in the inner space 123 than the required pressure (10MP to 30MP).

It is preferable that the solenoid valve 163 has a valve shutter speed that is high and that the valve operation is possible in an instant. Here, the connection to the gas tank 162 side and the connection to the atmospheric pressure side can be switched instantaneously. The solenoid valve 163 is connected to the gas tank 162. When the solenoid valve 163 opens the gas tank 162 side, the gas introducing pipe 164 directly supplies a gas pressure of 10MP to 30MP to the molten metal injection / To the internal space (123) of the substrate (120). On the other hand, when the solenoid valve 163 closes the gas tank 162 side and opens the atmospheric pressure side, the internal space 123 of the molten metal injection main unit 120 can be returned to the atmospheric pressure.

The scattering-preventing lid 165 is a lid-shaped object made of aluminum oxide or the like, which is made of porus aluminum alloy, which is not subjected to the molten metal from the molten aluminum alloy. By floating the lid 165 on the molten metal surface in the molten metal injection main section, This is to prevent the rupture of the molten metal or the scattering of the molten metal inside the injection cylinder. In addition, if the solid state oxide formed by the contact of the molten aluminum alloy with air is formed, the oxide may be substituted for the scatter preventing cap 165.

As described above, since the gas pressure introduced by opening and closing the solenoid valve 163 is large, the gas decelerating portion 129 is placed on the wall surface of the molten metal ejection main portion to reduce the gas flow rate, and the waviness of the molten- The scattering prevention cap 165 is floated on the surface of the molten metal bath to reliably prevent the waving of the molten metal surface and the scattering of the molten metal.

The above is a description of the respective members of the hot-chamber casting machine for aluminum alloy of the present invention shown in Fig.

Next, the operation of the hot-chamber casting machine for aluminum alloy of the present invention will be described in turn.

First, the first step of the casting cycle will be described.

2 is a diagram showing an initial state of the first process. 2, the solenoid valve 163 is connected to the atmospheric pressure side, and the molten metal is injected into the internal space 123 of the molten metal injection main unit 120 at a height of the molten metal in the crucible 112, Which is the height considering the above-mentioned height. The valve body 150 of the ball valve is naturally located at the bottom surface portion 124 of the molten metal injection main cylinder portion 120. The molten metal is an aluminum alloy, and is heated to a predetermined temperature to be in a liquid state in a good state.

Next, the first step is entered. Figure 3 is a diagram showing a first cycle of a molding cycle. 3, when the solenoid valve 163 is switched to be connected to the gas tank 162 side and the side of the gas tank 162 is opened, the gas is directly supplied to the gas tank 162 through the gas introduction pipe 164, A high-pressure gas having a pressure corresponding to the gas pressure is applied to the inner space 123 of the molten metal ejection main portion 120. As a result, the pressure is applied to the molten metal in the inner space 123 of the molten metal injection main part 120, and the valve body 150, which is a ball valve, is pressed downward to close the through hole 125. The molten metal in the inner space 123 is injected from the inner space 123 toward the injection path 130 when the inner space 123 of the molten metal injection main cylinder 120 and the injection path 130 are in conduction. . The mold 200 is provided through the end nozzle 140 of the injection path 130 and the molten aluminum alloy is die-cast in the mold 200.

Next, the second step is entered. Fig. 4 is a view showing the time when the casting is completed. After the completion of the injection and the first step, the solenoid valve 163 is switched to set the internal space 123 at atmospheric pressure. After a predetermined time elapses, the die-cast molded article is cooled to a predetermined temperature. After cooling, the die 200 is opened to take out the die-cast molded article as shown in Fig.

Fig. 5 is a view showing a state in which the state of Fig. 2 is restored in the second step. Fig. 4, the electromagnetic valve 163 is switched to be connected to the atmospheric pressure side, and when the connection at the gas tank 162 side is interrupted, the gas is directly introduced into the molten metal through the gas introduction pipe 164, The inner space 123 of the injection main portion 120 becomes the atmospheric pressure. The height of the liquid surface of the molten metal in the internal space 123 of the molten metal injection main cylinder 120 is lower than the height of the molten liquid in the crucible 112 in the state of FIG. The pressure applied from the lower surface of the valve body 150 to the valve body 150 is equal to the pressure applied from the lower surface of the molten metal in the crucible 112 It is the pressure at the height. 3, since the height of the molten metal in the inner space 123 is lower than the height of the molten metal in the crucible 112, the pressure received from the lower surface of the valve body 150 is large. The valve body 150 is lifted so that a gap is formed between the bottom surface portion 124 of the molten metal injection main portion 120 and the valve body 150 and the conduction hole 125 is made conductive. As a result, the molten metal of the crucible 112 flows into the inner space 123 of the molten metal injection main unit 120. 5 shows a state in which the valve body 150 rises and the molten metal is supplied to the inner space 123 of the molten metal injection main cylinder portion 120. When the weight of the valve body 150 is ignored, the supply of the molten liquid in the inner space 123 of the molten metal injection main cylinder 120 is stopped at the time when the molten liquid level in the crucible 112 becomes equal. The supply of the molten liquid in the inner space 123 is stopped at a level slightly lower than the level of the molten liquid in the crucible 112 because of the weight of the valve body 150 in practice. This supply amount may be the amount of molten metal required for the following die casting.

(State in which the valve body 150 does not go to the bottom face portion 124) (state in which the valve body 150 is floating) in Fig. 5 (state in Fig. 5), and the casting cycle is ended. The casting is repeated by repeating this casting cycle.

As described above, according to the hot-chamber casting machine for an aluminum alloy of the present invention, there can be obtained a hot-chamber casting machine in which there is no member to be frayed even if the melting furnace of the aluminum alloy is filled in the melting furnace, and the aluminum alloy can be diecast by the molten metal.

Further, the casting process of the hot-rod casting machine for aluminum alloy according to the present invention can be performed at the same speed as that of the conventional piston-cylinder type casting machine of the hot-chamber casting machine, and the casting cycle is advantageous.

According to the conventional hot-piston casting machine for the aluminum alloy of the present invention, it is necessary to use the gas pressure in accordance with the conventional piston-cylinder method, So that there is an advantage in that the demands for such processing accuracy and the demand for maintenance are small.

Further, in the hot-chamber casting machine for aluminum alloy according to the present invention, since the injection path 130 serving as the path of the molten metal is in the molten metal, external air does not enter and the problem of wind entering the die-

In addition, it is also possible to reduce the occurrence of the fracture layer seen in the cold chamber casting machine as described in the prior art.

Further, in the hot-chamber casting machine for an aluminum alloy of the present invention, since the injection pressure may be comparatively low, there is also an advantage that an excessive load is not applied to the metal mold.

While the preferred embodiments of the present invention have been shown and described, it will be understood that various modifications may be made without departing from the scope of the present invention.

The present invention is widely applicable to a chamber casting machine using an aluminum alloy as a molten metal.

100 Hot-bar casting machine for aluminum alloy
110 melting furnace
111 Heating device
112 Crucible
113 lid member
114 fixed portion
115 Injection Derivation Section
116 opening
117 upper mounting recess
118 Lower mounting recess
120 molten metal injection main cylinder
121 main part
122 Flange
123 interior space
124 bottom part
125 conduction ball
126 Lower wall
127 bottom space
128 aperture
129 gas deceleration section
130 Injection route
140 nozzle
150 valve body
160 gas pressurizing portion
161 High pressure pump
162 gas tank
163 Solenoid valve
164 gas introduction pipe
165 Shatterproof cover

Claims (6)

A melting furnace for melting the molten metal,
A molten metal injection main cylinder formed of ceramics inserted into the melting furnace,
An injection path provided on a side surface of the molten metal injection main section,
A nozzle provided at the tip of the injection path for diecasting the molten metal to the mold;
A valve body which is provided at a position lower than the injection path and opens and closes the inside of the melting furnace and the internal space of the molten metal injection main section in the molten metal injection main section;
And a gas pressurizing portion disposed on the melting furnace to control application and removal of a gas pressure of a predetermined pressure with respect to the inner space of the molten metal ejection main portion,
When the gas pressurization unit applies the gas pressure to the internal space of the molten metal ejection main cylinder unit, the valve body is moved in the closing direction so that the molten metal in the molten metal injection main cylinder unit is die-cast from the injection path to the mold, The gas pressurizing portion moves in a direction in which the valve body is opened when the gas pressure is removed with respect to the internal space of the molten metal ejecting main cylinder portion so that a necessary amount of the molten metal is supplied into the molten metal injection main cylinder portion in the following die casting in the melting furnace In a hot chamber casting machine for an aluminum alloy,
A structure for fixing the lower side surface of the molten metal injection main portion to the melting furnace through a fixing portion provided at a lower portion of the melting furnace,
A structure in which a flange is formed at the upper end of the molten metal injection main section and a flange at the upper end of the molten metal injection main section is fixed to the molten metal furnace through an upper installation recess provided in the upper part of the melting furnace,
And a gas pressure is applied to the inner space of the molten metal ejection main cylinder while pushing the gas pressurizing portion provided on the upper portion of the melting furnace downwardly in contact with the flange at the upper end of the molten metal ejection main portion. The method according to claim 1,
Wherein the valve body is a ball valve and a lower inner surface of the molten metal injection main cylinder portion is shaped like a mortar so that the ball valve can easily be connected to the conduction hole and a conduction hole smaller than the diameter of the ball valve is opened at the lowermost portion of the mortise- Wherein the molten metal is conductive in the melting furnace. 3. The method according to claim 1 or 2,
And a gas decelerator for decelerating a gas flow velocity of the gas injected from the gas pressurizing portion by gas is provided in an inner space of the molten metal injection main cylinder. 4. The method according to any one of claims 1 to 3,
A scattering preventing lid formed on the molten metal surface of the internal space of the molten metaljecting main cylinder portion by a material which does not receive molten metal damage by the molten metal and which has a specific gravity floating on the molten metal surface is provided, Thereby preventing scattering of the molten metal on the surface of the molten metal due to the gas entering the molten metal. 5. The method according to any one of claims 1 to 4,
Wherein the gas pressurizing portion includes a gas tank, an electromagnetic valve, and a gas introducing pipe, and the amount of gas to be applied is controlled by the opening and closing operation of the solenoid valve. A molten metal injection main cylinder formed of ceramics inserted into the molten metal furnace; an injection path provided on a side surface of the molten metal injection main cylinder; a nozzle provided at the tip of the injection path and diecasting the molten metal into a mold; A valve body provided at a position lower than the injection path in the molten metal injection main section to open and close the conduction between the inside of the melting furnace and the internal space of the molten metal ejection main section; And a gas pressurizing portion for controlling application and removal of the gas pressure,
The gas pressurizing portion moves in a direction in which the valve body is closed when the gas pressure is applied to the internal space of the molten metal injection main cylinder portion so that the molten metal in the molten metal injection main cylinder portion is diecast to the mold from the injection path, The molten metal is injected into the molten metal injection main cylinder through the molten metal injection main cylinder so that the molten metal is supplied to the inside of the molten metal injection main cylinder from the melting furnace through the next die casting by moving the valve body in a direction in which the valve body is opened, A hot chamber casting method using a metal material,
A lower wall surface of the molten metal injection main section is fixed to the melting furnace through a fixing section provided at a lower portion of the melting furnace,
A flange is formed at the upper end of the molten metal injection main part and a flange at the upper end of the molten metal injection main part is fixed to the molten metal furnace through an upper installation recess provided in the upper part of the molten metal furnace,
An aluminum alloy having a structure in which a gas pressurizing portion provided on an upper portion of the melting furnace is brought into contact with the flange at an upper end of the molten metal ejection main portion and is pressed downward and a gas pressure is applied to the inner space of the molten metal ejection main portion is used as a metal material Hot chamber casting method.

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