TWI568520B - Aluminum alloy hot room casting machine - Google Patents

Description

Hot chamber casting machine for aluminum alloy

The present invention relates to a hot chamber casting machine for aluminum alloy for die casting and a die casting method for using a hot chamber casting machine for aluminum alloy. In particular, the hot chamber casting machine for aluminum alloy according to the present invention is a problem in avoiding the conventional hot chamber casting machine, and is considered unsuitable in the conventional hot chamber casting machine, regarding the use of a cold chamber casting machine ( Cold chamber casting machine) can also be utilized in the field of casting.

The method of forming the article or part by casting the molten metal into the mold to obtain the necessary shape is called casting, and the article produced by the manufacturing method is called [casting].

Die casting is a manufacturing method in which a molten metal (molten metal) is injected (cast) by a piston at a predetermined pressure in a mold (die).

The die casting machines are classified into a hot chamber casting machine and a cold chamber casting machine when they are roughly distinguished. Both the hot chamber casting machine and the cold chamber casting machine melt the metal material for die casting, and eject the molten metal metal material into the forming mold for casting.

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

The hot chamber casting machine is a melting furnace integrated with the casting machine. The piston-cylinder injection portion and the introduction tube are located in the molten metal of the melting furnace and are heated together, so it is called hot chamber casting. machine. The molten metal is extruded from a piston-type hydraulic cylinder injection portion that has been deposited in the molten metal of the melting furnace, and is introduced into the mold through the introduction pipe to be cast.

Fig. 6 is a view showing the basic configuration of a conventional hot chamber casting machine.

As shown in FIG. 6, the hot chamber casting machine 10 houses the piston type hydraulic cylinder injection part 12 in the melting furnace 11, and the inside is filled with a molten metal. The piston 13 is connected to a piston drive mechanism (not shown). A molten metal suction port 14 is provided on the side surface of the piston type hydraulic cylinder injection portion 12, and the injection path 15 is guided by the end portion of the piston type hydraulic cylinder injection portion 12. A mold 17 is provided outside the melting furnace 11 via a nozzle 16 in the vicinity of the tip end of the injection path 15. Further, the height of the tip end of the nozzle 16 of the injection path 15 is set to be 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 carried out in the following procedure. The molten metal in the piston type cylinder injection portion 12 is extruded by the pressing of the piston 13 of the piston type hydraulic cylinder injection portion 12. The pressing of the piston is conventionally carried out at a pressure of 10 MPa to 30 MPa. For example, the pressure is applied to the piston by a hydraulic press and/or a linear motor (not shown). The molten metal is injected into the injection path 15 from the hydraulic cylinder by the pressing of the piston, and is emitted to the mold 17 via the nozzle 16. The mold 17 is separated and the internally formed product is taken out. There is also accompanying live When the plug 13 rises and the air starts to flow backward from the nozzle 16 and the injection path 15, the tip end of the piston 13 reaches the upper portion by the molten metal suction port 14, and the molten metal in the melting furnace 11 is the molten metal suction port 14 at this time. The piston cylinder is injected into the piston unit 12. Further, since the height of the tip end of the nozzle 16 is higher than the height of the molten metal surface of the melting furnace 11, the molten metal flowing in from the molten metal suction port 14 does not overflow from the nozzle 16, and the molten metal is filled up to the piston. The height of the pressing surface of 13.

The casting machine in which the molten metal injection portion is located inside the melting furnace has a constitution different from the above-described basic configuration. For example, it is disclosed in Japanese Laid-Open Patent Publication No. 2004-122134.

The hot chamber casting machine 10 described in FIG. 6 is characterized in that the program for supplying the molten metal to the piston type hydraulic cylinder injection portion 12 can be accompanied by the piston type hydraulic cylinder injection portion 12 in the melting furnace 11. The piston action is performed automatically, so the casting cycle is faster compared to the cold chamber casting machine.

Further, in the hot chamber casting machine shown in Fig. 6, there is a point that since the piston type hydraulic cylinder injection portion 12 which is the path of the die casting is located in the molten metal, there is no entrapment of air from the outside. If air enters, the blow hole enters the die-cast product and the product is in a bad condition. However, if the hot chamber casting machine 10 does not enter the piston-type hydraulic cylinder injection portion 12, the pores rarely enter the die-cast product. Bad condition in the middle.

Further, there is also a point that since the injection pressure is low as compared with the cold chamber casting machine, no transient load is applied to the mold 17.

Next, a cold chamber casting machine in the prior art will be described. The cold chamber casting machine separates the melting furnace from the casting machine, and takes 1 shot of the molten metal from the melting furnace and places the molten metal into a casting machine outside the melting furnace, and performs the outside of the melting furnace. Casting. The casting machine is not disposed in the melting furnace and is disposed outside, and is not heated, so it is called a cold chamber casting machine.

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

As shown in Fig. 7, in the cold chamber casting machine 20, an extruder 24 composed of a sleeve 22 and a plunger 23 is disposed outside the melting furnace 21 to become a plunger. 23 is a structure in which the pressing device 27 is connected and operated. A mold 25 is provided at the top end of the sleeve 22. Further, there is a ladder (ladle) 26 from which the molten metal is extracted from the melting furnace 21.

The casting process of the conventional cold chamber casting machine 20 shown in Fig. 7 is carried out in the following procedure. As shown in Fig. 7(a), the molten metal in the melting furnace 21 is taken out by the bucket 26, and a molten metal of a shot amount is injected into the sleeve 22. Next, as shown in FIG. 7(b), after a predetermined amount of molten metal is injected into the sleeve 22, it is formed by press-fitting the plunger 23 and inserting it into the mold 25. The pressing of the plunger 23 is conventionally carried out at a pressure of 60 MPa to 100 MPa. For example, the pressure is applied to the plunger 23 by a hydraulic press and/or a linear motor (not shown).

Here, the cold chamber casting machine 20 is characterized in that it can be used for die casting of a metal material having a high melting point. Even in the case of using a metal material having a high melting point such as an aluminum alloy or a copper alloy, the cold chamber casting machine 20 shown in Fig. 7 is separated from the extruder 24 of the casting machine, so that the extrusion molding machine 24 does not need to be exposed. At the high temperature of the melting furnace 21, there are no such parts After the melt loss. Therefore, it is possible to die-cast a material which melts the parts of the casting machine using a metal material having a high melting point or a molten metal of an aluminum alloy.

Further, another feature of the cold chamber casting machine 20 is that it is easy to form a product corresponding to a large one using a large mold. In the case of forming a large thing, the casting machine itself becomes large. However, if the mechanism of the casting mechanism is accommodated in the melting furnace like the hot chamber method, the melting furnace becomes very large. If this is a cold chamber die casting, since the melting furnace is separated from the casting machine, the size of the melting furnace can be suppressed.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2004-122134

There are disadvantages in the conventional cold chamber casting machine 20.

First, in the conventional cold chamber casting machine 20, there is a problem that the casting speed is relatively slow. In the conventional cold chamber casting machine 20, the operation from the melting furnace 21 by the pouring bucket 26 and injection into the sleeve 22 is required. Further, in order to surely extract the air to be described later, it is necessary to carefully and slowly insert the plunger 23. Therefore, the problem of a long casting time occurs.

Next, in the conventional cold chamber casting machine 20, there is a problem that air is mixed into the die-cast product and the pores enter. Since the conventional cold chamber casting machine 20 is installed in the air in the extrusion molding machine 24, the air is easily mixed into the sleeve 22 anyway, and the air is easily mixed in the molten metal to be injected. If air is mixed into the molten metal, the result of die casting in the mold 25 results in the entry of air pockets in the cast product. Therefore vacuum casting method (vacuum castina method) or PF method (non-porous method: Pore-free method) is established for countermeasures against the pores of the product, but it is very complicated.

Next, in the conventional cold chamber casting machine 20, there is a possibility that cracking of the metal occurs inside the formed cast product. In the conventional cold chamber casting machine 20, since the extrusion molding machine 24 is installed in the air, it is easily dissipated and cooled, and the aluminum alloy residue remaining in the sleeve 22 after being pressed by the plunger 23 is cooled and Sometimes small pieces may be formed on the wall or corner of the sleeve and may be pressed by the plunger 23 and die cast into the mold before being fully integrated with the molten metal being cast in the subsequent die casting. Therefore, there is a problem that a cast product is produced in a state in which small pieces are mixed. Further, since the temperature of the sleeve 22 is lower than the melting point of the aluminum alloy, a part of the molten metal of the aluminum alloy is solidified when the molten metal of the aluminum alloy is supplied to the sleeve 22 by the bucket 26, and the solid content is mixed into the molten state. In the state of the metal, it is sent to a mold, and the solid matter is molded in a state of being dispersed in the product. This is called a normally broken chill layer, which makes the strength of the product unstable.

As described above, there are disadvantages in the cold chamber casting machine, and in particular, if the casting speed is high and the casting pressure is low, it can be said that the hot chamber casting machine is a more excellent method.

However, the conventional hot chamber casting machine 10 has major drawbacks.

This disadvantage is a problem in the conventional hot chamber casting machine 10 in which an aluminum alloy cannot be used. If the aluminum alloy is melted in a 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, and therefore, the aluminum alloy is melted and melted in the aluminum alloy. Lost the original function. Not limited to iron alloys, almost all metals are subject to To the erosion of the aluminum alloy, satisfactory results cannot be obtained even by protection such as nitriding, thermal apraying or the like.

Therefore, it has been demanded to improve the hot chamber casting machine and to use a heat-resistant chamber casting machine which can be cast using an aluminum alloy.

Here, an improved sand low pressure casting machine different from the basic structure of Fig. 6 is known. The piston type hydraulic cylinder injection part 12 which replaces the piston type is a method of extruding a molten metal using air pressure. Further, it is a structure in which most of the portion which is the injection path is disposed on the melting furnace only by the cylinder in which the stalk is erected in the melting furnace.

Fig. 8 is a sand type low pressure casting machine disclosed in Japanese Laid-Open Patent Publication No. 2004-122134. In addition, the symbols used in the drawings are the symbols used in the drawings of Japanese Laid-Open Patent Publication No. 2004-122134, and are not related to other symbols in the present specification.

As shown in Fig. 8, the manufacturing apparatus is provided with a melting furnace 3 for storing a molten metal molten metal 2 inside the furnace body 1. A heating device 8 such as a gas burner that heats the melting furnace 3 is disposed in the furnace body 1. A mold table 12 carrying a sand mold 11 is disposed above the furnace body 1. In the melting furnace 3, the upper portion is sealed by the lid member 4, and the lid member 4 is formed with a pressurized gas supply port 6 for supplying the pressurized gas 5 to the inside of the melting furnace 3 at a low pressure. A pressurized gas supply means 7 is connected to the pressurized gas supply port 6. The riser pipe 21 is erected in the molten metal, and the riser pipe 33 is erected via the upper molten metal groove 29, and is connected to the sand mold 11. Further, a molten metal surface sensor 34 is provided.

The casting process first replaces the air in the cavity 16 in the sand mold 11 with the antioxidant gas or the combustion preventing gas 28 into the oxidation resistant gas or the combustion preventing gas 28 in the riser pipe 21. Next, pressure is applied to the molten metal surface of the light metal molten metal 2 stored in the melting furnace 3 at a low pressure by the pressurized gas 5, through the riser 21 erected in the molten metal, through the chamber which becomes the molten metal tank. (chamber) 29, and further, the light metal molten metal 2 is pushed up to the cavity 16 of the sand mold 11 through the riser pipe 33. When the cavity 16 is filled with the light metal molten metal 2, the light metal molten metal 2 in the cavity 16 is solidified in the original state.

As described above, the molten metal in the melting furnace 3 is pushed up by the pressurized gas 5 generated by the pressurized gas supply means 7, and is inserted into a mold, thereby becoming a mechanism that does not use a mechanism like a piston.

However, the sand type low pressure casting machine shown in Fig. 8 also has a problem to be solved.

First, in the sand type low pressure casting machine shown in Fig. 8, the metal material for treating the aluminum alloy is still insufficient. Most of the parts of the injection path are not in the melting furnace, so they are easy to dissipate heat, and the molten metal is high temperature, and the metal parts such as the liquid ejecting tube 21, the molten metal tank 29, and the liquid elevating tube 33 are exposed to high temperature. The aluminum alloy has not changed at this point, and the problem of melt loss still occurs.

Next, in the sand type low pressure casting machine shown in Fig. 8, there is a problem in the casting speed. In the configuration shown in Fig. 8, the pressure is applied to the liquid level of the molten metal of the large melting furnace in the sand type low pressure casting method, and the molten metal is lifted to the molten metal previously held in the melting furnace. Slot 29, so pressure control is difficult, and it is necessary to carefully apply pressure to adjust the molten gold. The liquid level of the genus is such that there is a problem that the casting cycle is slower than the basic shape of FIG. Therefore, while the molten metal surface sensor 34 senses the rising position of the molten metal surface, it is performed cautiously. Further, when the molten metal is filled in the sand mold 11, the molten metal applied to the melting furnace is applied because the pressure is applied to the entire liquid surface of the molten metal of the large melting furnace and the molten metal is injected into the sand mold 11. The pressure control of the entire liquid level is still difficult. Therefore, the pressurization needs to be carried out cautiously. Since the die casting machine can be die-cast in a one shot at a corresponding piston cycle, there is a problem in the casting speed.

In order to drive at a single high speed, the die casting is a high pressure air pressure extrusion method, and the pressure is very high, and it is also 10 MPa to 30 MPa. If the pressure is high, the stress applied to the main cylinder also differs too much, and the sway due to the stress becomes large, and there is a problem that the main cylinder is broken due to the swaying of the right and left.

Therefore, in view of the above problems, an object of the present invention is to provide a hot chamber casting machine for an aluminum alloy which has a high casting speed and which does not cause melt loss even if a molten metal of an aluminum alloy is used, by improving the hot chamber casting machine.

In order to achieve the above object, a hot chamber casting machine for an aluminum alloy according to the present invention comprises: a melting furnace for injecting a molten metal; and a molten metal formed by a ceramic (ceramic) which is erected in the melting furnace to emit a main cylindrical portion. And an emission path provided on a side surface of the molten metal to eject the main cylindrical portion; a tip end disposed at the tip of the emission path to die-cast the molten metal to the nozzle of the mold; and a molten metal ejection main tube portion disposed in the specific emission path a low position, opening and closing the valve body in the melting furnace and the molten metal is emitted from the inner space of the main tubular portion; and applying the air pressure to the internal space of the molten metal to the main tubular portion to control the predetermined pressure And the pressurizing portion that is removed, the pressurized portion applies a pair of molten metal to the inner space of the main tubular portion to apply air pressure, the valve body acts on the closed direction, and the molten metal is emitted from the molten metal inside the main tubular portion. The path is die-cast into the mold, and a pair of molten metal is injected into the inner space of the main cylinder to remove the air pressure, and the valve body acts on the opened direction, and the necessary amount of molten metal is pressed by the next die casting in the melting furnace. The molten metal is supplied to the inside of the main cylindrical portion, and is configured to transmit a first structure in which the molten metal is discharged to the lower wall surface of the main cylindrical portion by the fixing portion provided at the lower portion of the melting furnace; a second structure is provided at an upper end of the metal injection main cylinder portion, and a second structure is disposed on the melting furnace to fix the molten metal to the upper end of the main cylinder portion through the upper mounting recess provided in the upper portion of the melting furnace; and is disposed in the melting furnace The upper gas pressurizing portion abuts against the flange at which the molten metal is injected from the upper end of the main tubular portion and is pressed downward, and applies a third structure in which the molten metal is injected into the internal space of the main tubular portion.

According to the above configuration, in the hot chamber casting machine for an aluminum alloy according to the present invention, since the member disposed in the melting furnace is made of a molten metal made of ceramic, the main cylindrical portion is not melted. Further, in the hot chamber casting machine for an aluminum alloy according to the present invention, it is only necessary to pass the molten metal applied by the pressurizing portion to press the molten metal to eject the small molten metal surface of the main cylindrical portion, and only the molten metal is used. Press in, so the pressure control is simple, and the speed of die casting can be accelerated.

Further, in the conventional piston type hydraulic cylinder method, high machining precision is required on the wall surfaces of the piston and the hydraulic cylinder, the cost of production is made, and wall distortion is required in maintenance after operation. In the present invention, since the pressure is applied to the hydraulic cylinder by the air pressure, the distortion or error of the wall surface in the hydraulic cylinder does not become a countermeasure. The problem is that the manufacturing cost of the hydraulic cylinder can be reduced, and the maintenance after the operation can be easily achieved.

It is possible to reduce the stress applied to the molten metal by the molten metal, and has the effect of preventing cracking.

Here, the valve body is a ball valve, and the molten metal is ejected from the lower inner surface of the main tubular portion into a mortar shape so that the ball valve is easily guided by the through hole so as to be at the lowermost portion of the mortar-shaped wall surface than the ball valve. A configuration in which a small diameter via hole is opened to conduct into the melting furnace is preferred.

If it is a ball valve, it can be reliably closed by the pressure from the upper side, and if the pressure from the upper side becomes a negative pressure, it can be surely opened. If the ball valve is placed in the through hole, the removal and insertion of the molten metal in the melting furnace can be controlled. Further, when the molten metal is supplied, the molten metal in an amount commensurate with the molten metal consumed in the previous die casting can be supplied to the next die casting.

Further, it is preferable that a gas decelerating portion for decelerating the flow velocity of the gas which is caused by the application of the air pressure by the pressurizing portion is provided in advance in the internal space of the molten metal injection main cylinder portion. As soon as the airflow is strongly and strongly injected into the main cylindrical portion of the molten metal, droplets or waves are generated on the inner molten metal surface, thereby decelerating the infiltrated airflow. For example, a plate member, a labyrinth, a damper, or the like disposed at a position facing the gas introduction pipe may be used as the gas deceleration portion.

Further, in order to prevent the molten metal from ejecting from the molten metal surface inside the main cylindrical portion or the scattering of the molten metal when the gas is applied, the solid oxide generated by the molten metal of the aluminum alloy is brought into contact with the air, or The specific gravity is smaller than that of the molten aluminum alloy, and it is not subject to the molten state from the aluminum alloy. It is preferable that a lid-like object made of a porous aluminum oxide or the like floats on a molten metal surface in which the molten metal is emitted from the inside of the main tubular portion.

The pressurizing portion is preferably configured to include a gas tank, an electromagnetic valve, and a gas introduction pipe. In the case of a solenoid valve, the opening and closing operation is rapid, and the amount of gas to be applied can be accurately controlled by the opening and closing operation of the solenoid valve.

In the hot chamber casting machine for aluminum alloy according to the present invention, the member disposed in the melting furnace is a molten metal of a ceramic, which is injected into the main cylinder portion, the nozzle, and the ball valve, and the portion of the aluminum alloy that contacts the inside of the melting furnace is ceramic paint (ceramic Coating) coating, so that the aluminum alloy is not melted, and the aluminum alloy can be used as a metal material.

Further, in the hot chamber casting machine for an aluminum alloy according to the present invention, it is sufficient that the molten metal is pressed through the molten metal by the pressure applied to the molten metal to eject the small molten metal surface of the main tubular portion, and only the downward direction is pressed. Therefore, the pressure control is simple, and the die casting speed can be accelerated.

Further, in the conventional piston type hydraulic cylinder system, high machining accuracy is required on the wall surfaces of the piston and the hydraulic cylinder, and the manufacturing cost is required, and the wall surface distortion or wear is also required for maintenance after the operation. However, in the present invention, since the pressure is applied to the hydraulic cylinder by the air pressure, the distortion or error of the wall surface in the hydraulic cylinder is not a problem, and the manufacturing cost of the hydraulic cylinder can be reduced, and the maintenance after the operation can be performed. Simply do it.

1‧‧‧ furnace body

2‧‧‧Light metal molten metal

3‧‧‧ melting furnace

4‧‧‧Cover components

6‧‧‧ Pressurized gas supply port

7‧‧‧Compressed gas supply means

8‧‧‧Connector base

9‧‧‧Ladder-shaped projections

10‧‧‧Hot chamber casting machine

11‧‧‧ melting furnace

12‧‧‧Piston Hydraulic Cylinder Injection Department

13‧‧‧Piston

14‧‧‧Inhalation

15‧‧‧jecting path

15a‧‧‧Bottom made of magnetic material

16‧‧‧ nozzle

17‧‧‧Mold

20‧‧‧Know cold chamber casting machine

21‧‧‧ melting furnace

22‧‧‧ sleeve

23‧‧‧Plunger

24‧‧‧Extrusion molding machine

26‧‧‧Pour bucket

29‧‧‧fused metal trough

100‧‧‧Hot chamber casting machine for aluminum alloy

110‧‧‧melting furnace

111‧‧‧ heating device

112‧‧‧坩埚

113‧‧‧Cleaning

114‧‧‧ fixed department

115‧‧‧Output Path Derivation Department

116‧‧‧ openings

117‧‧‧Upper mounting recess

118‧‧‧ Lower mounting recess

120‧‧‧Fused metal shot from the main tube

121‧‧‧Main section

122‧‧‧Flange

123‧‧‧Internal space

124‧‧‧ bottom part

125‧‧‧via

126‧‧‧ below the wall

127‧‧‧ bottom space

128‧‧‧ openings

129‧‧‧ gas deceleration

130‧‧‧Injection path

140‧‧‧Nozzles

150‧‧‧ valve body

160‧‧‧ gas pressurization

161‧‧‧High pressure pump

162‧‧‧ gas trough

163‧‧‧Solenoid valve

164‧‧‧ gas introduction tube

165‧‧‧scatter prevention cover

200‧‧‧Mold

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 aluminum alloy of the present invention.

Fig. 3 is a view showing a first procedure of a casting cycle of the hot chamber casting machine 100 for aluminum alloy of the present invention.

Fig. 4 is a view showing a second procedure of the casting cycle of the hot chamber casting machine 100 for aluminum alloy of the present invention.

Fig. 5 is a view showing a state in which the hot chamber casting machine 100 for aluminum alloy of the present invention is cast and returned to the initial state of the casting cycle.

Fig. 6 is a view showing the basic configuration of a conventional hot chamber casting machine.

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

Fig. 8 is a sand type low pressure casting machine disclosed in Japanese Laid-Open Patent Publication 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. However, the technical scope of the present invention is not limited to the specific use, shape, size, and the like shown in the following embodiments.

[Example 1]

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.

In Fig. 1, in order to make the internal structure easy to understand, each member is shown in a longitudinal section. In FIG. 1, in order to understand the features of the components, the components are simply illustrated, and only the components necessary for understanding the present invention are illustrated. There are also cases in which the components are not shown.

In the structural example of FIG. 1 , the hot chamber casting machine 100 for aluminum alloy includes a melting furnace 110 , a molten metal injection main cylinder portion 120 , an injection path 130 , a nozzle 140 , a valve body 150 , and a gas pressurizing unit 160 . Moreover, the mold 200 is displayed together.

The melting furnace 110 is provided with a heating device 111 and a crucible 112 that stores a molten metal that melts the metal material. A lid member 113 is disposed on the top surface of the crucible 112, and an opening portion 116 is formed in a portion thereof, and the opening portion 116 supplies the aluminum alloy material consumed by the casting. The lid member 113 is provided with an upper mounting recess 117 that accommodates the upper portion of the molten metal injection main tubular portion 120. Here, the molten metal is a molten metal that melts the aluminum alloy.

Further, in the configuration example of Fig. 1, the crucible 112 of the melting furnace 110 is provided with a fixing portion 114 for fixing the molten metal to the main tubular portion 120 in the standing state in the interior, and is provided with the mounting fixing portion 114. The lower portion mounts the recess 118.

Further, a nozzle 140 for guiding the injection path 130 to the mold is disposed.

The fixing portion 114 is a member for stably fixing the molten metal to the main cylindrical portion 120 inside the crucible 112, and is fixed in contact with the outer wall surface or member of the molten metal injection main tubular portion 120. In the configuration example of Fig. 1, a flange 122 is provided at the upper end of the molten metal emission main cylinder portion 120, and the upper side flange 122 of the molten metal injection main cylinder portion 120 is fitted into the upper mounting recess 117, and further, for gas addition. The pressing portion 160 abuts against the upper portion, and is fixed so as to surround the side surface and the top surface of the flange 122 of the molten metal portion of the main tubular portion 120. According to this, it is possible to restrict the movement of the molten metal in the upper direction in the vicinity of the upper portion of the main tubular portion 120 and the movement in the horizontal direction. Further, a lower wall surface 126 is erected on a lower portion of the molten metal emission main tubular portion 120, and the fixing portion 114 fitted to the lower attachment concave portion 118 is externally abutted against the lower wall surface 126 of the molten metal emission main tubular portion 120. Components. According to this, it is possible to restrict the movement of the molten metal in the lower direction in the vicinity of the lower portion of the main tubular portion 120 and the movement in the horizontal direction. In this manner, the molten metal is emitted from the upper portion and the lower portion of the main cylindrical portion 120 by the fixing portion 114 so as to be restricted in the vertical direction and moved in the horizontal direction, so that the molten metal is stably fixed.

The molten metal injection main cylinder portion 120 is a ceramic cylinder that is erected in the crucible 112 of the melting furnace 110. As a ceramics, a cylinder having excellent heat resistance is produced, and it is preferable that a molten metal of an aluminum alloy is not melted or damaged.

The shape of the molten metal injection main tubular portion 120 is not limited, but is configured here as shown in the shape of FIG. In the configuration example of Fig. 1, the flange 122 protrudes from the upper end of the cylindrical main cylinder portion 121. The internal space of the main cylinder portion 121 is 123. A bottom surface portion 124 formed in a mortar shape is formed on the bottom surface of the main cylinder portion 121, and a through hole 125 is formed at the bottom. A valve body 150 that controls opening and closing is attached to the through hole 125.

A lower wall surface 126 that extends the outer wall surface of the main cylinder portion 121 below is provided in the vicinity of the bottom surface of the main cylinder portion 121, and surrounds the bottom space 127 located below the bottom surface of the main cylinder portion 121, but at least the lower wall surface 126 is at least A portion thereof is provided with an opening 128 for introducing molten metal into the bottom space 127. The molten metal is conducted through the opening 128 to the bottom space 127. Thus, the opening/closing operation of the valve body 150 controls the conduction/isolation of the internal space 123 and the bottom space 127.

Further, in the configuration example of FIG. 1, a gas deceleration portion 129 is provided in the vicinity of the upper portion of the internal space 123 of the molten metal emission main tubular portion 120. The gas deceleration unit 129 is a member that decelerates the flow velocity of the gas that is introduced by the gas introduction pipe 164 by the application of the air pressure of the pressurizing unit 160 to be described later. The structure in which the gas flow velocity is weakened by the contact with the air flow is not particularly limited in the configuration of members such as a plate-like body or a baffle plate, and a labyrinth pipe in which the passage of the inner conductive pipe is bent into a meandering shape. . By providing such a gas deceleration portion 129, the airflow is strongly and strongly injected into the molten metal injection main cylinder portion 120 and protrudes into the molten metal surface to generate droplets or waves, thereby suppressing the molten metal from being emitted. Damage to the tubular portion 120 or the like.

The emission path 130 is a path provided on the side surface of the molten metal emission main tube portion 120, and is electrically connected to the internal space 123 of the molten metal emission main tube portion 120, and the molten metal is emitted from the internal space 123 of the main cylindrical portion 120 by pressurization. The molten metal pressed by the gas of the portion 160 is die-cast into the mold 200 through the injection path 130.

The nozzle 140 is a member disposed near the tip end of the injection path 130 and is connected to the mold 200. The molten metal is die cast into the mold 200 by the nozzle 140. The nozzle 140 is guided to the outside of the crucible 112 through the emission path deriving portion 115 and is connected to the mold 200.

The valve body 150 is disposed at a position lower than the emission path 130 in the molten metal emission main tube portion 120, and is configured to open and close the inside of the crucible 110 of the melting furnace 110 and the internal space 123 of the molten metal emission main tube portion 120. member. In the configuration example of Fig. 1, the valve body 150 serves as a ball valve. Further, as described above, the bottom surface portion 124 of the inner space 123 of the molten metal injection main cylinder portion 120 is formed in a mortar shape so that the ball valve is easily guided by the conduction hole 125. The via hole 125 has a structure smaller than the diameter of the ball valve, and the via hole 125 is closed by being embedded in the ball valve.

In the closed state in which the valve body 150 is pressed, the crucible 112 of the melting furnace 110 and the inner space 123 of the molten metal injection main cylinder portion 120 are isolated, and the movement of the molten metal therebetween disappears. Here, since the valve body 150 is disposed at a position lower than the emission path 130, the conduction between the internal space 123 of the molten metal main pipe portion 120 and the injection path 130 is maintained, and as a result, the valve body 150 is applied upward. In a state where the pressure causes the valve body 150 to be closed, the molten metal is guided toward the injection path 130.

On the other hand, in the open state in which the valve body 150 is not pressed, as will be described later in detail, when the molten metal 163 is operated by the electromagnetic valve 163, the molten metal is emitted into the internal space 123 of the main tubular portion 120 to be atmospheric pressure, and is applied to the valve. The pressure of the top surface of the body 150 disappears due to the molten metal located in the internal space 123 being die-cast into the mold 200, and thus becomes small. On the other hand, the pressure applied to the bottom surface of the valve body 150 is affected by the molten metal from the crucible 112. The pressure is high, so the valve body 150 is pushed up. As soon as the valve body 150 is pushed upward, a gap is formed between the through hole 125 and the valve body 150, and the crucible 112 of the melting furnace 110 and the inner space 123 of the molten metal injection main cylinder portion 120 are electrically connected. As soon as the valve body 150 is opened, the molten metal flows into the internal space 123 until the pressure difference between the two disappears, that is, until the molten metal is ejected from the top surface of the molten metal of the internal space 123 of the main cylindrical portion 120. It is equal to the top surface of the molten metal in the crucible 112. Further, since the valve body 150 has a weight, it is necessary to consider the influence of the weight portion of the valve body 150.

The gas pressurizing unit 160 is a portion that applies and removes the air pressure that controls the predetermined pressure in the internal space 123 of the molten metal main pipe portion 120.

In the configuration example of FIG. 1 , the gas pressurizing unit 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 scattering prevention cover 165 .

The high pressure pump 161 is a device that feeds high pressure gas into the gas tank 162. The gas tank 162 is a container for preliminarily storing a gas of a predetermined pressure by blowing a high-pressure gas into the internal space 123 of the molten metal injection main cylinder portion 120 by opening and closing the electromagnetic valve 163.

The gas pressure stored in the gas tank 162 is equivalent to a pressure of 10 MPa to 30 MPa which is generally required for the piston pressure of the hot chamber casting machine when the solenoid valve 163 is opened. The point to be considered here is that the molten metal that is not filled in the inner space 123 of the main cylindrical portion 120 before the solenoid valve 163 is about to be opened is only the pressure of atmospheric pressure (about 0.1 MPa), so the electromagnetic is turned on. When the valve 163 introduces the gas of the gas groove 162 into the internal space 123, the atmospheric pressure portion of the internal space 123 is combined with the pressure portion of the gas groove 162 to be applied to the molten metal surface. That is to say, the high gas pressure of the storage portion of the original gas groove 162 is reduced by the atmospheric pressure portion of the internal space 123 and is applied to the molten metal surface, so that the gas pressure previously stored in the gas groove 162 is considered to be not required for injection. The pressure (10 MPa to 30 MPa) is set to be slightly larger after the reduction of the atmospheric pressure portion of the internal space 123.

The solenoid valve 163 has a valve shutter speed, and it is preferable to perform the valve motion instantaneously. Here, the side connected to the gas groove 162 and the side connected to the atmospheric pressure can be switched instantaneously. The solenoid valve 163 is connected to the gas groove 162, and the solenoid valve 163 opens the gas groove 162 side, and the gas introduction pipe 164 can immediately apply a gas pressure of 10 MPa to 30 MPa to the internal space 123 of the molten metal injection main cylinder portion 120. On the other hand, when the solenoid valve 163 closes the gas groove 162 side and opens the atmospheric pressure side, the molten metal can be returned to the atmospheric pressure of the internal space 123 of the main cylindrical portion 120.

The scattering prevention cover 165 is a lid-shaped object made of porous alumina or the like which is not subjected to melting loss from the molten metal of the aluminum alloy, and is melted by the molten metal before the molten metal is injected into the main cylindrical portion. The metal surface is a member for preventing scattering of molten metal or molten metal from the molten metal surface inside the main cylindrical portion when the gas is applied. Further, in the state in which a solid oxide formed by contact of an aluminum alloy molten metal with air is formed, the oxide may become a substitute for the scattering prevention cover 165.

As described above, since the air pressure introduced by the opening and closing of the electromagnetic valve 163 is large, the gas flow velocity is decelerated by providing the gas deceleration portion 129 on the wall surface of the molten metal injection main cylinder portion, and the molten metal surface is caused to wave or The scattering of the molten metal is prevented, and the scattering prevention cover 165 is floated on the molten metal surface in advance, and the scattering of the molten metal surface or the scattering of the molten metal can be reliably prevented.

The above is the description of each member of the hot chamber casting machine for aluminum alloy of the present invention shown in Fig. 1 .

Next, the movement of the hot chamber casting machine for aluminum alloy of the present invention It will be explained in order.

First, the first procedure of the casting cycle will be explained.

Fig. 2 is a diagram showing an initial state of the first program. As shown in FIG. 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 main cylindrical portion 120, and the molten metal is filled up to correspond to the height of the molten metal in the crucible 112. The degree of density of 150. The valve body 150 of the ball valve is naturally stabilized by the molten metal exiting the bottom surface portion 124 of the main tubular portion 120. The molten metal is an aluminum alloy, and is heated to a predetermined temperature and is in a liquid state in a good state.

Second, enter the first procedure. Figure 3 is a diagram showing the first procedure of the casting cycle. As shown in FIG. 3, the solenoid valve 163 is switched to be connected to the side of the gas groove 162, and once the gas groove 162 side is opened, the high pressure gas at a pressure commensurate with the pressure of 10 MPa to 30 MPa required for die casting is immediately passed through the gas introduction pipe 164. The molten metal is applied to the internal space 123 of the main tubular portion 120. As a result, the pressure is applied to the molten metal in which the molten metal is ejected from the internal space 123 of the main tubular portion 120, and the valve body 150 of the ball valve is pressed downward and the via hole 125 is closed. Here, since the molten metal is emitted from the inner space 123 of the main tubular portion 120 and the emission path 130, the molten metal of the internal space 123 is pressed, and is emitted from the internal space 123 toward the emission path 130. The mold 200 is disposed through the nozzle 140 on the front side of the injection path 130, and the molten metal of the aluminum alloy is die-cast into the mold 200.

Second, enter the second program. Fig. 4 is a view showing the time point at which casting is completed. After the completion of the injection and the end of the first program, the solenoid valve 163 is switched to bring the internal space 123 to atmospheric pressure. Waiting for the prescribed time, etc. The die-cast molded product is cooled to a predetermined temperature, and after cooling, as shown in FIG. 4, the mold 200 is opened and the die-cast molded article is taken out.

Fig. 5 is a view showing a state in which the state of Fig. 2 is being restored in the second program. As shown in FIG. 5, at the time when the casting of FIG. 4 is completed, the solenoid valve 163 is switched to be connected to the atmospheric pressure side, and the connection on the side of the gas groove 162 is isolated, and the molten metal is immediately ejected from the main cylinder via the gas introduction pipe 164. The internal space 123 of the portion 120 becomes atmospheric pressure. The molten metal exits the molten metal of the inner space 123 of the main cylindrical portion 120 at a liquid level of the state of FIG. 3, that is, the liquid level of the molten metal is higher than the liquid level of the molten metal in the crucible 112. low. Here, the pressure applied to the valve body 150 from the top surface is the pressure generated by the height of the molten metal of the internal space 123 at atmospheric pressure, and the pressure applied to the bottom surface of the valve body 150 is generated by the height of the molten metal of the crucible 112. pressure. Since the height of the molten metal of the internal space 123 is lower than the height of the molten metal of the crucible 112 in the state of FIG. 3, the pressure received by the bottom surface of the valve body 150 is large. Therefore, the valve body 150 ascends, and a gap is formed between the bottom surface portion 124 of the molten metal injection main cylinder portion 120 and the valve body 150, and the conduction hole 125 is electrically connected. As a result, the molten metal of the crucible 112 flows into the internal space 123 of the molten metal exiting the main tubular portion 120. In FIG. 5, the valve body 150 is raised, and the molten metal is supplied to the state in which the molten metal is emitted from the internal space 123 of the main tubular portion 120. When the weight of the valve body 150 is ignored, the supply is stopped when the molten metal surface of the internal space 123 of the molten metal main discharge portion 120 becomes the same height as the molten metal surface in the crucible 112. In fact, since the valve body 150 has a weight, only the affected portion of the weight of the valve body 150 is in the molten metal level of the internal space 123. The supply is stopped in a state where the molten metal surface in the crucible 112 is slightly lower. The supply amount may be any amount of molten metal required for the next die casting.

The state of FIG. 5 (the state in which the valve body 150 floats) is shifted to the state of FIG. 2 (the state in which the valve body 150 is accommodated in the bottom surface portion 124), and the casting cycle is completed. The casting is repeated by repetition of the casting cycle.

According to the hot chamber casting machine for aluminum alloy according to the present invention, even if the molten metal of the aluminum alloy in the melting furnace is filled with the member without melting loss, heat which can be die-casted by using the aluminum alloy as a molten metal can be obtained. Chamber casting machine.

Further, the casting procedure of the hot chamber casting machine for aluminum alloy of the present invention can be carried out at the same speed as the cycle of the piston type hydraulic cylinder of the conventional hot chamber casting machine, and has an advantage that the casting cycle is fast.

Further, in the case of the conventional piston-type hydraulic cylinder system, when the machining accuracy of the wall surfaces of the two is required to be required for maintenance or repair of distortion or wear due to use, the hot chamber casting of the aluminum alloy according to the present invention is required. Since the molten metal surface is applied to the hydraulic cylinder by using air pressure, there is an advantage that such machining accuracy is required or maintenance is less required.

Further, in the hot chamber casting machine for aluminum alloy of the present invention, since the injection path 130 which is the path of the molten metal is located in the molten metal, there is no entrapment of air from the outside, and the pores rarely enter the die-cast product. Bad condition.

Moreover, it is also possible to suppress the occurrence of a cracked chill layer which is seen in a cold chamber casting machine as explained in the subject of the prior art.

Moreover, in the hot chamber casting machine for aluminum alloy of the present invention, since it is shot The pressure is low, so there is also the advantage that the instantaneous load is not applied to the mold.

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

The present invention can be widely used as a hot chamber casting machine using aluminum alloy as a molten metal.

100‧‧‧Hot chamber casting machine for aluminum alloy

110‧‧‧melting furnace

111‧‧‧ heating device

112‧‧‧坩埚

113‧‧‧Cleaning

114‧‧‧ fixed department

115‧‧‧Output Path Derivation Department

116‧‧‧ openings

117‧‧‧Upper mounting recess

118‧‧‧ Lower mounting recess

120‧‧‧Fused metal shot from the main tube

121‧‧‧Main section

122‧‧‧Flange

123‧‧‧Internal space

124‧‧‧ bottom part

125‧‧‧via

126‧‧‧ below the wall

127‧‧‧ bottom space

128‧‧‧ openings

129‧‧‧ gas deceleration

130‧‧‧Injection path

140‧‧‧Nozzles

150‧‧‧ valve body

160‧‧‧ gas pressurization

161‧‧‧High pressure pump

162‧‧‧ gas trough

163‧‧‧Solenoid valve

164‧‧‧ gas introduction tube

165‧‧‧scatter prevention cover

200‧‧‧Mold

Claims (5)

A hot chamber casting machine for aluminum alloy, comprising: a melting furnace for injecting molten metal; a molten metal formed by ceramics standing in the melting furnace is emitted from the main cylindrical portion; and the molten metal is emitted from the molten metal An emission path of a side surface of the main tubular portion; a nozzle disposed at a tip end of the emission path to die-cast the molten metal to the mold; and the molten metal emission main tubular portion is disposed at a position lower than the emission path a valve body that opens and closes the inside of the melting furnace and the molten metal to emit the internal space of the main tubular portion; and a pressurizing portion that applies and removes the air pressure that regulates the predetermined pressure in the internal space of the molten metal by the molten metal portion. The pressurizing portion applies the air pressure to the internal space of the molten metal-emitting main tubular portion, and the valve body acts on the closed direction, and the molten metal emits the molten metal inside the main tubular portion from the outgoing path. The die is die-cast into the mold, and the pair of molten metal is injected into the internal space of the main tubular portion to remove the air pressure, and the valve body acts on the opened direction, and the necessary amount of the next die casting in the melting furnace Fused metal The molten metal is supplied to the interior of the main cylindrical portion is emitted, the following structure is provided with: a fixed portion disposed through a lower portion of the melting furnace to the melting furnace to fix the a first structure in which the molten metal is ejected from the lower wall surface of the main tubular portion; a flange is provided at an upper end of the molten metal ejecting main tubular portion, and the melting is fixed to the melting furnace through an upper mounting recess provided in an upper portion of the melting furnace a second structure in which the metal is injected from the upper end of the main tubular portion; and a gas pressurizing portion disposed on the upper portion of the melting furnace abuts the flange of the molten metal exiting the upper end of the main tubular portion and is pressed under At the same time, the third structure in which the molten metal is injected into the internal space of the main tubular portion is applied. The hot chamber casting machine for aluminum alloy according to claim 1, wherein the valve body is a ball valve, and the molten metal is sprayed out of the lower inner surface of the main cylinder portion to form a mortar so that the ball valve is easily guided by the through hole. The structure is opened to the inside of the melting furnace by opening the via hole having a smaller diameter than the diameter of the ball valve at the lowermost portion of the wall surface of the mortar. The hot chamber casting machine for an aluminum alloy according to the first or second aspect of the invention, wherein the molten metal is injected into the inner space of the main cylindrical portion to provide a gas flow rate that is caused by the pressure applied by the pressurized portion. Deceleration gas deceleration section. A hot chamber casting machine for an aluminum alloy according to claim 1 or 2, wherein the molten metal surface of the molten metal is discharged from the molten metal surface of the main cylindrical portion so as not to be caused by the molten metal The material of the melted material and the scattering prevention cover formed by the specific gravity floating on the surface of the molten metal prevent scattering of the molten metal surface by the gas which is introduced by the pressure applied by the pressurized portion. A hot chamber casting machine for an aluminum alloy according to claim 1 or 2, wherein the pressurizing portion is provided with a gas groove and a solenoid valve and a gas guide The inlet pipe controls the amount of gas to be applied by the opening and closing operation of the solenoid valve.