JPWO2011089711A1 - Inclined gravity casting machine - Google Patents

Abstract

A mold 3 that can be tilted between an inverted state and a standing state that rises approximately 90 degrees from the inverted state, and a gate die 7 that is formed with a gate 71 that guides the molten metal to the cavity 2 of the molded product. In the inclined gravity casting apparatus comprising the bowl-shaped member 4 for storing the molten metal and pouring the molten metal into the pouring gate 71 according to the tilting of the mold 3, there is no need for hot water, no need to slow the inclination speed, and In order to appropriately pressurize the molten metal in the mold, the sealing means 8 provided between the gate 71 and the cavity 2 and capable of opening and closing the gate 71 and the standing state A gas port 9 provided at the upper part of the mold 3 to prevent the molten metal from flowing out of the mold 3 and to allow only gas to pass therethrough, and to supply the high-pressure gas to the gas port 9 Gas supply means 1, an inclined-type gravity casting apparatus having a.

Description

  The present invention relates to a casting apparatus that forms a molded product by pouring a molten metal into a mold, and in particular, an inclined gravity that obtains a molded product by pouring the molten metal in a bowl-shaped member into the mold and solidifying according to the tilt of the mold. The present invention relates to a casting apparatus.

  Gravity casting equipment that casts molten metal by pouring the molten metal into the mold only by the gravity of the molten metal from the spout provided at the upper part of the mold, can increase the cooling rate at the time of casting, and is a precise casting with good casting surface and dimensional accuracy Manufacturable, especially with excellent pressure resistance and mechanical properties. On the other hand, such a gravity casting apparatus needs to form a feeder that compensates for volume reduction when solidified on the upper part of the molded product, and a time for cooling and solidifying the feeder is required in addition to the solidification time of the molded product. . In addition, the amount of molten metal and the melting cost are further required by forming the feeder, and the processing cost for cutting the feeder is also required.

  On the other hand, a low-pressure casting apparatus is an example of a casting apparatus that requires almost no feeder. This low-pressure casting machine puts the molten metal in a sealed container, pressurizes the molten metal surface with a gas body having a relatively low pressure of 1 atm or less, pushes the molten metal through the hot water supply pipe in the direction opposite to gravity, and is installed on it. Then, molten metal is poured into the mold to form a molded product (Non-Patent Document 1). According to this, since the molten metal is pushed up by applying pressure, there is little volume reduction at the time of solidification, and no molten metal is required.

  However, since the low-pressure casting apparatus pushes up the molten metal from the lower side of the mold, a hot water supply pipe is provided under the mold to pressurize it. Since the cooling rate cannot be increased, the strength of the molded product tends to be weak compared to the gravity casting apparatus.

  Thus, a gravity casting apparatus has been proposed in which after the molten metal is poured into the mold, gas is supplied into the mold to pressurize the molten metal in the mold. In this gravity casting apparatus, for example, as shown in FIG. 12, a hopper device 102 is fixed to a gate 101 formed in a mold 100, and a molten metal 103 is stored in the hopper device 102, and the mold 100 is tilted. A tilting gravity casting apparatus 105 of the type in which the molten metal 103 is sometimes poured into the cavity 104 of the mold 100 through the gate 101, and the hopper apparatus 102 includes a gas supply means 106 for supplying high-pressure gas (for example, Patent Document 1 and Patent Document 2). According to this, after the molten metal 103 in the hopper device 102 is poured into the cavity 104 of the mold 100, the high pressure gas is supplied to the hopper device 102, so that the molten metal 103 in the cavity 104 is pressurized with gas via the gate 101. Therefore, the gravity casting apparatus 105 which does not require a feeder can be realized.

JP 2008-1000027 A JP 2008-1003006 A

"On-site technology of castings", edited by Kenji Chijiiwa, published by Nikkan Kogyo Shimbun, November 5, 1980, P270-P271

  However, since the above-mentioned gravity casting apparatus 105 pressurizes the gas from the pouring gate 101 that supplies the molten metal 103, it is difficult to adjust the flow rate when the gas is pressurized. Moreover, since the molten metal 103 is supplied from the gate 101 and the air is discharged, if the supply speed of the molten metal 103 is too fast, the molten metal 103 covers the gate 101 and the air in the cavity 104 may not be discharged. Therefore, it is necessary to slow down the inclination speed.

  Therefore, the present invention provides an inclined gravity casting apparatus that does not require a feeder, and does not require slowing the inclination speed, and can appropriately gas pressurize the molten metal in the mold. The purpose is to do.

  The tilt type gravity casting apparatus of the present invention forms a cavity that forms a molded product, and includes a mold that can be tilted between an inverted state and a standing state that rises approximately 90 degrees from the inverted state, and a molten metal. A gate mold formed with a gate that guides to the cavity, a bowl-shaped member that stores molten metal and pours the molten metal into the gate according to the tilt of the mold, and is provided between the gate and the cavity of the mold, Shielding means capable of opening and shielding the gate, and a gas valve provided on an upper part of the standing mold, and allowing the molten metal to flow out of the mold and allow gas to pass therethrough. And a gas supply means capable of supplying a high-pressure gas to the gas port.

  The tilt type gravity casting apparatus of the present invention is further characterized by further comprising a cooling means capable of cooling the mold.

  Moreover, the tilt type gravity casting apparatus of the present invention is characterized in that a plurality of the gas ports are provided with a constant opening.

  In the inclined gravity casting apparatus of the present invention, the molded product is a tire wheel.

  Moreover, the inclined gravity casting apparatus of the present invention is characterized in that the gate is separable into at least a plurality.

  According to the inclined gravity casting apparatus of the present invention, after the bowl-shaped member supplies the molten metal to the mold through the gate, the gate is shielded by the shielding means, and the high pressure gas is supplied from the gas port to the mold by the gas supply means. By doing so, the molten metal in a casting_mold | template can be gas-pressurized. Accordingly, there is no need to provide a feeder, so that the casting time can be shortened by the time for cooling and solidifying the feeder, and the manufacturing cost of the molded product can be reduced. Further, it is possible to reduce the amount of molten metal for forming the feeder, the melting cost, and the processing cost for cutting the feeder.

  In addition, when the molten metal is injected into the mold from the bowl-shaped member by tilting the mold, the air in the mold can be discharged to the outside through the gas port. You can speed up.

  Moreover, according to the tilt type gravity casting apparatus of the present invention, the molten metal poured into the mold can be cooled by the cooling means, so that the hardness of the molded product can be further increased. Moreover, solidification time can be shortened because it can cool in this way, and casting cost can be reduced more.

  In addition, according to the inclined gravity casting apparatus of the present invention, a plurality of gas ports are provided at regular intervals, so that gas can be evenly pressurized with the molten metal. Therefore, the inconvenience that the molten metal near the gas port dents and hardens can be suppressed.

  Further, according to the inclined gravity casting apparatus of the present invention, since the molded product is an annular tire wheel, it was difficult to uniformly pressurize the gas with the conventional gravity casting apparatus. Since they are provided at regular intervals, the gas can be uniformly pressurized to the molten metal.

  In addition, according to the tilt type gravity casting apparatus of the present invention, the gate can be separated into a plurality of pieces, so that, for example, even when there is too much molten metal and solidifies in the gate, it can be easily removed by separating the gate. it can.

Sectional drawing which shows an example of the gravity casting apparatus of this invention. The perspective view which cut off the near side half in the vertical plane in order to explain the composition of the gate mold, the shielding means, and the upper mold. The perspective view which shows the state which the shielding means obstruct | occluded the gate in the perspective view of FIG. The perspective view which cut off the near side half by the perpendicular surface, in order to explain the composition of a side mold and a lower mold. The perspective view explaining the gas valve provided in a gas port, and sectional drawing. Sectional drawing which shows the inclination-type gravity casting apparatus of the inversion state which the sprue opened facing the side. Sectional drawing which shows the state in the middle of inclining an inclination type gravity casting apparatus by operating a tilting apparatus. Sectional drawing which shows the inclination command gravity casting apparatus of the standing state which the pouring gate opened upwards. A state where the gate is closed by sliding the shielding means will be described. Sectional drawing explaining the state which pulls apart an upper metal mold | die, a side metal mold | die, and a lower metal mold | die respectively, and takes out a molded product. Sectional drawing explaining the state which divided the gate mold. Sectional drawing which shows an example of the conventional gravity casting apparatus.

  Hereinafter, the best embodiment of the inclined gravity casting apparatus 1 will be described with reference to the drawings. In the present embodiment, an inclined gravity casting apparatus 1 that casts an aluminum alloy tire wheel (molded product 6) will be described as an example. However, the inclined gravity casting apparatus 1 may be other types such as an engine cylinder of an automobile, for example. The member may be cast. As shown in FIG. 1, the inclined gravity casting apparatus 1 forms a cavity 2 that forms a molded product 6 by connecting a plurality of decomposable hardware with a hydraulic cylinder. Formed on the upper part of the standing mold 3 and receiving the molten metal 5, the casting mold 3 capable of tilting to the standing state raised about 90 degrees, the bowl-shaped member 4 storing the molten metal 5 such as an aluminum alloy, for example. A gate mold 7 in which a gate 71 is formed, shielding means 8 capable of releasing and shielding the gate 71, a gas port 9 formed separately from the gate 71 on the standing mold 3, Gas supply means 91 for allowing high-pressure gas to flow into the mold 3 from the gas port 9.

  The mold 3 includes an upper mold 31, a lower mold 33, and a side mold 32 that can be divided into four pieces. The movements of the upper mold 31, the lower mold 33, and the side mold 32 are controlled by a hydraulic jack (not shown), and when forming the mold 3, the hydraulic jacks are brought into close contact with each other. Is controlling. The mold 3 is fixed to a tilting device (not shown) together with the hydraulic jack, and can tilt up to at least 90 degrees.

  As shown in FIGS. 1 and 2, the upper mold 31 is formed in a bowl shape so that the outer surface 31a forms the shape of the inner peripheral surface of the rim of the tire wheel (molded product 6) and the inner surface of the disk. Yes. A pouring die 7 having a pouring gate 71 into which the molten metal 5 can be poured is fixed to the upper end of the upper die 31, and the hook-like member 4 is further secured to the pouring die 7. A gas port 9 is annularly arranged at an upper portion of the upper mold 31 with a predetermined interval.

  As shown in FIGS. 1 and 4, the lower mold 33 is formed such that the upper side forms the shape of the outer surface of the disk of the tire wheel (molded product 6), and is a hub provided so as to protrude in the center. The upper mold 31 is joined by the hole forming portion 33a and the wheel fixing bolt hole forming portion 33b provided around the hub hole forming portion 33a. Further, the lower mold 33 is provided with an air-cooling type cooling means 33c, so that the molten metal 5 can be cooled during casting. The side mold 32 has a substantially cylindrical shape whose inner periphery forms the shape of the outer peripheral surface of the rim of the tire wheel (molded product 6), and is divided into four substantially equal parts. The lower portion of the side mold 32 is fixed in contact with the outer periphery of the lower mold 33.

  As shown in FIG. 1, the bowl-shaped member 4 is formed in a bowl shape, and is fixed to the upper end of the upper mold 31 of the mold 3 while being tilted by 90 degrees when the mold 3 is held upright. Is done. 2 and 7, the gate mold 7 is a metal member provided with a gate 71 that receives the molten metal 5 and guides the molten metal 5 to the cavity 2 in the mold 3. As shown in FIG. 11, the gate mold 7 can be further divided into an upper member 72, an intermediate member 73, and a lower member 74, which are fixed by bolts, for example. . The gate mold 7 is fixed to the upper mold 31 with bolts. Since it can be divided into three in this way, as shown in FIG. 11, for example, even when there is too much molten metal 5 and solidifies in the gate 71, it can be easily removed by separating the gate mold 7. .

  The shielding means 8 is a metal member that is slidably installed between the gate mold 7 and the cavity 2 of the mold 3 as shown in FIGS. The connecting portion 81 to which the shielding means slide hydraulic jack 85 can be connected, the main body portion 82 formed with a through hole 84 communicating with the pouring gate 71 of the pouring die 7 at the center, And a stopper 83 that can be fixed in alignment with the gate 71. When the shielding means 8 is pulled using the shielding means sliding hydraulic jack 85, the shielding means 8 is pulled out to a position where the stopper 83 contacts the inner peripheral surface of the gate mold 7 as shown in FIG. At this time, the through hole 84 of the shielding means 8 is aligned with the gate 71 of the gate mold 7 so that the gate mold 7 and the cavity 2 communicate with each other. Therefore, the molten metal 5 received by the gate die 7 from the bowl-shaped member 4 can be guided to the cavity 2. On the other hand, when the shielding means 8 is pushed in using the shielding means sliding hydraulic jack 85, the gate 71 of the gate mold 7 is shielded as shown in FIG. As a result, the cavity 2 does not communicate with the gate 71, and the gas in the cavity 2 does not flow out of the gate 71.

  In addition, the surface of the shielding means 8 that is in contact with the lower member 74 of the gate mold 7 is formed with a slight downward slope toward the through hole 84 so that the vicinity of the through hole 84 is most depressed. The surface of the lower member 74 of the gate mold 7 that contacts the shielding means 8 is also slightly inclined toward the gate 71 so that the vicinity of the gate 71 swells most. With this configuration, when the shielding means 8 is slid to shield the gate 71 of the gate mold 7, the shielding means 8 and the lower member 74 of the gate mold 7 are more closely attached. The molten metal 5 can be prevented from entering between the shielding means 8 and the gate mold 7.

  As shown in FIG. 1, the gas port 9 is an elongated hole that communicates the cavity 2 with the outside formed in the upper mold 31 separately from the gate mold 7. A gas valve 92 is provided on the cavity 2 side of the gas port 9 to allow gas to pass and to prevent the molten metal 5 from flowing out. As shown in FIG. 5, the gas valve 92 is a cylindrical metal part with a bottom, and a plurality of narrow slits 92 a are formed at the bottom. Gases such as air can freely pass through the slit 92a, but the molten metal 5 such as aluminum alloy has a high surface tension and is difficult to adhere to other objects. As a result, the molten metal 5 does not pass through the gas valve 92. The gas supply means 91 supplies a rare gas such as helium or argon or air to the cavity 2 through the gas port 9 at a high pressure.

  When forming a casting using the inclined gravity casting apparatus 1 configured as described above, first, a hydraulic jack (not shown) is controlled to hold the mold 3 in an inverted state. Here, the inverted state is a state in which the mold 3 is inclined so that the portion provided with the pouring gate 71 faces sideways, and the pouring gate 71 is held so as to be positioned below the cavity 2. At this time, the bowl-shaped member 4 is fixed to the gate mold 7 with the upper part opened. Further, the shielding means 8 is held such that the gate 71 of the gate mold 7 is opened. Next, an aluminum alloy melt 5 controlled at a predetermined temperature with a handle not shown is poured into the bowl-like member 4 to accumulate the melt 5.

  Then, a tilting device (not shown) is controlled to gradually tilt the mold 3 until it reaches the standing state. As shown in FIG. 7, the molten metal 5 stored in the bowl-shaped member 4 passes through the gate 71 of the gate mold 7 and further passes through the through hole 84 of the shielding means 8 and is poured into the cavity 2 to stand upright. When the state is reached, the melt 5 fills the cavity 2 as shown in FIG.

  Then, as shown in FIG. 9, the shielding means sliding hydraulic jack 85 is controlled to push the shielding means 8, thereby shielding between the gate 71 and the cavity 2 of the gate mold 7. Thereafter, as shown in FIG. 1, gas supply pipes are connected to all the gas ports 9 formed in the upper mold 31, and the high-pressure gas is supplied into the cavity 2 by controlling the gas supply means 91. Next, the cooling means 33 c provided in the lower mold 33 is operated to cool the molten metal 5 in the cavity 2.

  When the molten metal 5 is cooled and solidified, a hydraulic jack (not shown) is controlled to pull the upper mold 31 away from the molded product 6 and the side mold 32 to be separated in four directions. Then, the molded product 6 can be obtained by removing the molded product 6 from the lower mold 33.

  As described above, according to the inclined gravity casting apparatus 1 of the present embodiment, when the mold 3 is tilted and the molten metal 5 is poured from the bowl-shaped member 4 into the gate 71, the air in the cavity 2 is passed through the gas port 9. Therefore, it is sufficient that only the molten metal 5 can be injected from the pouring gate 71, and the molten metal 5 can be poured into the entire pouring gate 71, so that the inclination speed of the mold 3 can be increased. Further, by supplying a high pressure gas from the gas port 9 into the cavity 2 by the gas supply means 91, the molten metal 5 in the cavity 2 can be pressurized with gas, and there is no need to provide a feeder. Therefore, the casting time can be shortened by the time for cooling and solidifying the feeder, and the manufacturing cost of the molded product 6 can be reduced. Further, it is possible to reduce the amount of molten metal for forming the feeder, the melting cost, and the processing cost for cutting the feeder.

  Furthermore, since the molten metal 5 injected into the mold 3 can be cooled by the air-cooling type cooling means 33c formed in the lower mold 33, the hardness of the molded product 6 can be increased and less material can be used. It is possible to cast the molded product 6 that exhibits the required strength with a light weight. In addition, the ability to cool in this way can shorten the solidification time, thereby further reducing the casting cost.

  Since the gas port 9 is continuously connected to the upper mold 31 at regular intervals, the gas can be evenly pressurized by the molten metal 5 and the inconvenience that the molten metal 5 near the gas port 9 is depressed and hardened is also suppressed. can do.

  Needless to say, the embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the idea of the present invention.

  The inclined gravity casting apparatus 1 according to the present invention can be suitably used as, for example, a casting apparatus for casting a molded product of an aluminum alloy.

DESCRIPTION OF SYMBOLS 1 Inclination type gravity casting apparatus 2 Cavity 3 Mold 4 Saddle-shaped member 5 Molten metal 6 Molded article 7 Pouring die 8 Shielding means 9 Gas port 33c Cooling means 71 Pouring gate

The tilt type gravity casting apparatus of the present invention forms a cavity that forms a molded product, and includes a mold that can be tilted between an inverted state and a standing state that rises approximately 90 degrees from the inverted state, and a molten metal. A gate mold formed with a gate that guides to the cavity, a bowl-shaped member that stores molten metal and pours the molten metal into the gate according to the tilt of the mold, and is provided between the gate and the cavity of the mold, Shielding means capable of opening and shielding the gate, and a gas valve provided on an upper part of the standing mold, and allowing the molten metal to flow out of the mold and allow gas to pass therethrough. And a plurality of gas ports arranged at regular intervals, and gas supply means capable of supplying high-pressure gas to all the gas ports.

In the inclined gravity casting apparatus of the present invention, the molded product is a tire wheel .

Moreover, the inclined gravity casting apparatus of the present invention is characterized in that the gate is separable into at least a plurality .

Further, in the inclined gravity casting apparatus of the present invention, the shielding means is a metal member in which a through hole communicating with the gate is formed in the center, and is slidably installed between the gate and the mold cavity. The upper surface is formed in a downward slope toward the through hole, and the gate mold is formed so as to be inclined so that the lower surface swells toward the gate .

In addition, when the molten metal is injected into the mold from the bowl-shaped member by tilting the mold, the air in the mold can be discharged to the outside through the gas port. You can speed up. Further, since a plurality of gas ports are provided at regular intervals , the gas can be evenly pressurized with the molten metal. Therefore, the inconvenience that the molten metal near a gas port dents and hardens | cures can also be suppressed.

The shielding means 8, as shown in FIGS. 1, 2, and 9, a metallic member installed slidably between the cavity 2 of the hot water cap type 7 and the mold 3, shielding蔽A connecting portion 81 to which the means slide hydraulic jack 85 can be connected, a main body portion 82 formed with a through hole 84 communicating with the pouring gate 71 of the pouring gate mold 7 at the center, and the through hole 84 serving as the pouring gate of the pouring die 7. 71 and a stopper 83 that can be fixed in a state of alignment with each other. When the shielding means 8 is pulled using the shielding means sliding hydraulic jack 85, the shielding means 8 is pulled out to a position where the stopper 83 contacts the inner peripheral surface of the gate mold 7 as shown in FIG. At this time, the through hole 84 of the shielding means 8 is aligned with the gate 71 of the gate mold 7 so that the gate mold 7 and the cavity 2 communicate with each other. Therefore, the molten metal 5 received by the gate die 7 from the bowl-shaped member 4 can be guided to the cavity 2. On the other hand, when the shielding means 8 is pushed in using the shielding means sliding hydraulic jack 85, the gate 71 of the gate mold 7 is shielded as shown in FIG. As a result, the cavity 2 does not communicate with the gate 71, and the gas in the cavity 2 does not flow out of the gate 71.

Claims (5)

Forming a cavity that forms a molded article, and a mold that can be tilted between an inverted state and a standing state that rises approximately 90 degrees from the inverted state;
A gate mold in which a gate for guiding the molten metal to the cavity is formed;
A bowl-shaped member for storing molten metal and pouring the molten metal into the gate according to the tilt of the mold;
A shielding means provided between the gate and the cavity of the mold, and capable of opening and shielding the gate;
A gas port provided at an upper part of the mold in the standing state, and having a gas valve that allows the molten metal to pass through the gas while preventing the molten metal from flowing out of the mold;
A tilting gravity casting apparatus comprising: gas supply means capable of supplying high-pressure gas to the gas port.   The inclined gravity casting apparatus according to claim 1, further comprising cooling means capable of cooling the mold.   The inclined type gravity casting apparatus according to claim 1 or 2, wherein a plurality of the gas ports are provided with a constant opening to each other.   4. The inclined gravity casting apparatus according to claim 1, wherein the molded product is a tire wheel.   The inclined gravity casting apparatus according to any one of claims 1 to 4, wherein the gate is separable into at least a plurality.

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