JP3875954B2 - Casting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a casting apparatus, and more specifically, a cast product obtained by filling a molten metal such as aluminum into a cavity connected to an air vent hole opened on the surface of a mold at a pressure near atmospheric pressure and solidifying the cavity. The present invention relates to a casting apparatus in which the mold is divided into a plurality of split molds.
[0002]
[Prior art]
As a casting apparatus for aluminum or the like, there are various apparatuses. For example, there is a die casting apparatus proposed in Patent Document 1 below.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-84648 (FIG. 1)
[0004]
In the die of the die casting apparatus proposed in Patent Document 1, a cavity having an air vent hole is formed, and a molten metal pouring port is provided below the cavity. One end of a cylindrical sleeve is connected to the molten metal pouring port, and a plunger is inserted into the sleeve so as to be movable along the sleeve.
A plunger driving device for moving the plunger along the central axis of the sleeve is attached to the other end of the plunger, and a pouring port for pouring molten metal into the sleeve is provided in the middle of the sleeve. .
[0005]
In this die casting apparatus, the plunger is moved (retracted) to a predetermined position so that a predetermined space is formed between the other end surface of the plunger and the molten metal pouring port of the cavity by the plunger driving device, and the molten metal pouring of the cavity is performed. A predetermined amount of molten metal poured from the pouring port is stored in a sleeve extending from the pouring gate to the other end surface of the plunger.
Next, the plunger is moved (advanced) in the direction of the molten metal pouring port of the cavity by the plunger driving device, and the molten metal stored in the sleeve is press-fitted into the cavity while being filled with high pressure.
Thereafter, the molten metal press-fitted into the cavity at high pressure is cooled and solidified while maintaining the applied high pressure, the mold is opened, and the cast product is taken out.
[0006]
[Problems to be solved by the invention]
According to the die-casting device, the molten metal can be filled into the cavity of the mold at high speed, and the productivity of the cast product can be improved. However, in the die-casting device, when the molten metal is injected into the cavity and filled, high pressure is applied. Added to the mold. For this reason, a shaping | molding die must be made into a pressure | voltage resistant type | mold, a shaping | molding die enlarges and the magnitude | size of the castable product which can be cast is also restrict | limited.
Furthermore, in order to move the plunger in the direction in which the molten metal is pressed into the cavity at a high pressure, the plunger drive device needs to be able to exert a large driving force, and a hydraulic drive device that enlarges the device must be employed. You may not get.
[0007]
For this reason, the present inventors perform casting using a casting apparatus in which one end of a sleeve into which a plunger is inserted is connected to a molten metal pouring port connected to an air vent hole that opens on the surface of a mold. By filling and solidifying the molten metal stored in the sleeve with a plunger at a pressure close to atmospheric pressure, the pressure-resistant structure of the molding die can be remarkably relaxed compared to the molding die of the die casting device, In addition, when casting a thin cast product or a cast product having a complicated shape, it is considered that an air pocket or the like is hardly generated in the cavity, and a casting apparatus shown in FIG.
In the casting apparatus shown in FIG. 6, the mold 100 is constituted by a pair of split molds 100 a and 100 b that are split when a cast product is taken out, and the cavity 102 formed therein has the mold 100. It is connected with the air vent hole 104 opened on the surface of this.
The split mold 100a is formed with a pouring passage 106 for pouring the molten metal into the cavity 102, and one end of a cylindrical sleeve 110 into which the plunger 108 is movably inserted is connected to the molten metal pouring port. ing. The sleeve 110 is also formed with a supply port 112 for supplying molten metal into the sleeve 110.
The plunger 108 is moved along the sleeve 110 by the plunger driving device 114.
[0008]
In the casting apparatus shown in FIG. 6, the molten metal stored in the sleeve 110 can be filled in the cavity 102 at a pressure near atmospheric pressure by the movement of the plunger 108 and solidified, and then the mold can be divided and the cast product taken out.
According to such a casting apparatus shown in FIG. 6, since the molten metal can be filled in the cavity 102 at a pressure near atmospheric pressure, the pressure-resistant structure such as the molding die 100 is compared with the molding die of the die casting apparatus. While being able to relax, the plunger drive device 114 can also employ a small one without requiring a large driving force.
Incidentally, in the casting apparatus shown in FIG. 6, the casting product is taken out from the molding die 100 by dividing the molding die 100. In such a mold 100, the split mold 100a is a fixed mold because the sleeve 110 is fixed, and the split mold 100b is a movable mold that moves in the contact / separation direction with respect to the split mold 100a. For this reason, the casting product is taken out from the mold 100 by moving the split mold 100b.
[0009]
However, when the shape of the cast product becomes complicated, an insertion member such as a pin is inserted into the cavity 102. Such an insertion member also needs to be moved to a position where it does not interfere with the removal of the cast product by the movement of the split mold 100b. For this reason, the moving distance of the split mold 100b becomes long and the mold split time becomes long, so that the productivity of the cast product is lowered.
Although it is possible to shorten the moving distance of the split mold 100b by making both the split molds 100a and 100b movable, the sleeve 110 can be separated from the split mold 100a when the cast product is taken out. Providing the sleeve 110, the plunger 108, and the plunger driving device 114 movably complicates the casting apparatus.
Accordingly, an object of the present invention is to provide a casting product obtained by filling and solidifying molten metal into a cavity of a mold at a pressure near atmospheric pressure via a sleeve into which a plunger is inserted, and dividing the mold into a plurality of molds. It is an object of the present invention to provide a casting apparatus that has a simple structure and can take out a molded product in a short time when divided into molds and taken out.
[0010]
[Means for Solving the Problems]
As a result of repeated studies to solve the above-mentioned problems, the inventors of the present invention require that the sleeve, the plunger, and the plunger driving device be movably provided by connecting one end of the sleeve to the split surface of the mold. In order to securely fix the sleeve to the split surface of the mold, it is effective to use an adapter member that is sandwiched and integrated by a plurality of split molds. did.
That is, the present invention provides a casting product obtained by filling and solidifying a molten metal such as aluminum at a pressure close to atmospheric pressure in a cavity connected to an air vent hole opened on the surface of the molding die. In a casting apparatus that divides the mold into a plurality of split molds, a sleeve having one end connected to the molten metal pouring port of the runway extending from the cavity of the mold, and moved from the other end of the sleeve A plunger inserted freely, a plunger driving device for moving the plunger along the sleeve, and a hot water feeding means for feeding the molten metal into the sleeve are provided, and the molten metal pouring port of the mold and one end of the sleeve The connection with the part is fixed to the base of the mold, and when the plurality of split molds are integrated to form the mold, they are sandwiched and integrated with the plurality of split molds. As above In casting apparatus characterized in that it is made via an adapter member positioned parting surface of the mold.
[0011]
In the present invention, as the adapter member, a recess into which one end of the sleeve is inserted is formed, and the bottom of the recess with which one end of the sleeve inserted into the recess abuts is connected to the molten metal inlet of the mold. By using the adapter member in which the passage to be opened is used, one end of the sleeve can be reliably connected to the adapter member. The outer shape of the adapter member, when sandwiched by a plurality of split molds, is integrated with the split mold by concavity and convexity, thereby further ensuring the connection between the adapter member and the mold. It can be carried out.
Furthermore, the adapter member and the molten metal pouring port can be reliably connected by forming the peripheral portion of the abutting surface of the adapter member with the molten metal pouring port on the tapered surface inclined in the direction of the molten metal pouring port.
[0012]
According to the present invention, the adapter member that is fixed to the base of the molding die and is located on the mold dividing surface of the molding die is connected to the molten metal pouring port of the runway extending from the molding die and the one end of the sleeve. Done through. For this reason, one end of the sleeve is not fixed to any of the split molds constituting the mold, and any split mold can be used as the movable mold.
Moreover, when the adapter member is formed by integrating a plurality of split molds, the adapter member is sandwiched and integrated by the plurality of split molds. For this reason, a shaping | molding die and the one end part of a sleeve can be connected and fixed reliably.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A schematic diagram illustrating an example of a casting apparatus according to the present invention is shown in FIG. The casting apparatus shown in FIG. 1 is an aluminum casting apparatus, and a holding furnace 10 that holds molten aluminum is provided with a hot water feed pump 12 that sends out the molten metal. The hot water supply pump 12 sends out the molten metal by a hot water supply driving device 14 such as a motor. As the hot water supply pump 12, for example, a constant quantity hot water pump described in Japanese Patent Application Laid-Open Nos. 9-150253 and 2001-219261 can be suitably used.
The conduit 16 that guides the molten metal sent out from the hot water supply pump 12 is connected to a cylindrical sleeve 22 connected to the mold 30.
As shown in FIG. 2A, the sleeve 22 is provided with a nozzle 28 to which the conduit 16 is connected, and one end of the sleeve 22 is fixed to the base 32 of the molding die 30. It is connected to the mold 30 via the adapter member 34. A plunger 24 is inserted into the sleeve 22 from the other end side of the sleeve 22, and the plunger 24 moves along the sleeve 22 by a plunger driving device 26 such as a motor or an air cylinder device.
[0014]
As shown in FIG. 2B, the molding die 30 is composed of split molds 30a and 30b, and an adapter is mounted on the base 32 so that the adapter member 34 is positioned on the split surfaces of the split molds 30a and 30b. The member 34 is fixed and provided. Therefore, one end of the sleeve 22 is connected to the mold dividing surface of the mold 30.
The split molds 30a and 30b of the mold 30 shown in FIG. 2B are movable molds that are movable in the left-right direction with the adapter member 34 interposed therebetween.
As shown in FIG. 3, a cavity 36 is formed in the mold 30 in which the split molds 30 a and 30 b are integrated, and the cavity 36 is connected to an air vent hole 38 opened on the surface of the mold 30. ing. Furthermore, a water channel 40 extends from the cavity 36, and the end surface of the adapter member 34 is in contact with the molten metal pouring port of the water channel 40.
[0015]
As shown in FIG. 4, the adapter member 34 is formed with a recess 42 into which one end of the sleeve 22 is inserted, and the bottom surface of the recess 44 with which one end of the sleeve 22 inserted into the recess 42 abuts. A passage 46 connected to the molten metal pouring gate of the hot water passage 40 in the mold 30 is opened.
Further, the vicinity of the outer peripheral portion of the bottom portion 44 is a portion that is sandwiched between the split dies 30 a and 30 b and integrated with the molding die 30, and the outer shape of this portion is formed into a shape that is integrated with the molding die 30. ing.
[0016]
In the adapter member 34 shown in FIGS. 3 and 4, a convex portion 48 is provided in a bowl shape on the outer peripheral side of the bottom portion 44 of the concave portion 42, and this convex portion 48 is formed by integrating the split dies 30 a and 30 b. When forming the mold 30, the mold 30 is engaged with the concave and convex grooves 50 (FIG. 3) formed in the vicinity of the molten metal pouring port of the split molds 30 a and 30 b. As a result, the adapter member 34 and the split molds 30a and 30b are integrated.
Further, the peripheral portion of the contact surface of the bottom portion 44 of the recess 42 with the molten metal pouring port is formed on a tapered surface 52 inclined in the direction of the molten metal pouring port, and the mold 30 is formed by integrating the split molds 30a and 30b. When doing so, the force which connects both can be concentrated in the direction of the molten metal pouring port, and the adapter member 34 and the molten metal pouring port can be reliably connected.
[0017]
The adapter member 34 shown in FIGS. 3 and 4 can connect the sleeve 22 and the adapter member 34 by inserting one end of the sleeve 22 into the recess 42 and abutting one end of the sleeve 22 on the bottom surface of the recess.
Thus, when the adapter member 34 connected to one end of the sleeve 22 is sandwiched between the split molds 30a and 30b in the vicinity of the outer periphery of the bottom 44 forming the recess 42, as shown in FIG. In addition, the formed mold 30 is integrally engaged with the concave and convex portions.
Since the adapter member 34 is fixed to the base 32 and is positioned on the split surfaces of the split molds 30a and 30b, when the split molds 30a and 30b are moved in the left-right direction and split, FIG. As shown in (b), the concave-convex engagement between the convex part 48 of the adapter member 34 and the concave groove 50 of the split molds 30a, 30b is released with the movement of the split molds 30a, 30b.
On the other hand, when the split molds 30a and 30b are integrated, the projections 48 of the adapter member 34 and the concave grooves of the split molds 30a and 30b are moved by moving each of the split molds 30a and 30b in the direction of the adapter member 34. 50 is engaged with the projections and recesses, and is engaged with the mold 30 so as to be integrated.
[0018]
As shown in FIG. 5A, when casting is performed using the mold 30 integrated with the adapter member 34, the hot water pump 12 provided in the holding furnace 10 is connected via the conduit 16 and the nozzle 28. Hot water is fed into the sleeve 22 and a predetermined amount of molten metal is stored in the sleeve 22.
The molten metal stored in the sleeve 22 moves the plunger 24 and fills the cavity 36. At this time, the moving speed of the plunger 24 is adjusted so that the molten metal can be filled in the cavity 36 at a pressure near atmospheric pressure.
Next, when the molten metal filled in the cavity 36 is cooled and solidified, as shown in FIG. 5B, the split molds 30a and 30b can be moved and split to take out the cast product.
After taking out the cast product, the split molds 30a and 30b are moved, and the vicinity of the outer periphery of the bottom 44 of the adapter member 34 is sandwiched by the split molds 30a and 30b as shown in FIG. The next casting is performed.
In the casting apparatus shown in FIG. 1, the molten metal is fed into the sleeve 22 from the hot-water feeding pump 12, but a ladle type ladle may be used and the molten metal in the holding furnace 10 may be supplied by the ladle type ladle.
[0019]
2, 3, and 5, the split molds 30 a and 30 b are both movable. However, depending on the shape of the cast product, one of the split molds 30 a and 30 b may be used. It may be a fixed type and the other may be a movable type.
2, 3, and 5, the split molds 30 a and 30 b of the mold 30 move in the left-right direction with the adapter member 34 interposed therebetween, but the split molds 30 a and 30 b have the vertical direction with the adapter member 34 interposed therebetween. It may be provided to be movable.
In the casting apparatus shown in FIG. 1, a predetermined amount of molten metal stored in the sleeve 22 is filled into the cavity 36 by the plunger 24, but from the hot water supply pump 12 to the cavity 36 via the sleeve 22. When the filling is performed and the molten metal is filled in the cavity 36, the plunger 24 may be driven to close the nozzle 28.
[0020]
【The invention's effect】
According to the casting apparatus of the present invention, a casting product obtained by filling and solidifying the molten metal into the cavity of the mold at a pressure close to the atmospheric pressure via the sleeve in which the plunger is inserted, When the mold is divided and taken out, the take-out time of the molded product can be shortened with a simple structure. As a result, it is possible to reduce the size and speed of the casting apparatus.
[Brief description of the drawings]
FIG. 1 is a schematic view for explaining an example of a casting apparatus according to the present invention.
FIG. 2 is a partial cross-sectional view for explaining the configuration of the mold shown in FIG. 1 and the vicinity thereof.
FIG. 3 is a partial cross-sectional view for explaining the relationship between an adapter member and a mold.
FIG. 4 is a cross-sectional view illustrating an adapter member.
FIG. 5 is an explanatory diagram for explaining the operation of the split molds 30a and 30b constituting the mold 30. FIG.
FIG. 6 is a schematic diagram for explaining the outline of the prototype of the present inventor.
[Explanation of symbols]
22 Sleeve 24 Plunger 26 Plunger driving device 30 Mold 30a, 30b Split mold 32 Base 34 Adapter member 36 Cavity 38 Air vent hole 40 Runway 42 Recess 44 Bottom 46 Path 48 Protrusion 50 Concave groove 52 Tapered surface

Claims (4)

A casting product obtained by filling and solidifying a molten metal such as aluminum at a pressure in the vicinity of atmospheric pressure in a cavity connected to an air vent hole opened on the surface of the mold is formed into a plurality of split molds. In a casting device that is divided into molds and taken out,
A sleeve having one end connected to a molten metal pouring port extending from the mold cavity, a plunger inserted movably from the other end of the sleeve, and moving the plunger along the sleeve And a plunger driving device for supplying the molten metal to the sleeve and a hot water feeding means for feeding the molten metal into the sleeve,
The connection between the molten metal pouring port of the mold and one end of the sleeve is fixed to the base of the mold, and the plurality of split molds are integrated to form the mold. A casting apparatus characterized in that it is formed through an adapter member located on the mold split surface of the mold so as to be sandwiched and integrated with the mold. The adapter member is formed with a recess into which one end of the sleeve is inserted, and a passage connected to the molten metal inlet of the mold is opened at the bottom of the recess where one end of the sleeve inserted into the recess contacts. The casting apparatus according to claim 1. The casting apparatus according to claim 1 or 2, wherein when the outer shape of the adapter member is sandwiched between a plurality of split molds, the adapter member is integrated with the split molds by being unevenly fitted. The casting apparatus according to any one of claims 1 to 3, wherein a peripheral portion of a contact surface of the adapter member with the molten metal pouring port is formed on a tapered surface inclined in the direction of the molten metal pouring port.

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