JP2007069218A - Casting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casting apparatus which can reduce a powder release agent coming into a pressure reducing means. <P>SOLUTION: The casting apparatus 100 comprises a metallic die D for forming a cavity 3 by a fixed die 1 and a movable die 2, a powder supplying device 6 for supplying the powder release agent to the cavity 3 by compressed air A1, and a pressure reducing means 8 for reducing the pressure in the cavity 3. The casting apparatus 100 further comprises a pipe conduit 25 for flowing the compressed air A1 passed through the cavity 3, a cyclone type separator 26 which is arranged in the pipe conduit 25 and collects the powder release agent contained in the compressed air A1 by a centrifugal force, and a suction device 27 which is arranged in the pipe conduit 25 and increases the flow velocity of the compressed air A1 to flow in the cyclone type separator 26 by joining the compressed air A2, which has a flow velocity higher than that of the compressed air A1, to the compressed air A1 flowing in the pipe conduit 25, wherein the pressure reducing means 8 reduces the pressure in the cavity 3 after the cyclone type separator 26 has collected the powder release agent contained in the compressed air A1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a casting apparatus.

A known casting apparatus is described in Patent Document 1 described later. This apparatus has a mold that forms a cavity with a fixed mold and a movable mold, a release agent supply means that supplies a powder mold release agent to the cavity, and a decompression chamber that communicates with the cavity. Thus, a decompression means for decompressing the cavity is provided, and casting is performed by supplying molten metal to the cavity decompressed by the decompression means. The powder release agent is supplied to the cavity decompressed by the decompression means and adheres to the mold surface forming the cavity.
JP 2001-170748 A

  In the above-described apparatus, of the powder release agent supplied to the cavity, the excess that does not adhere to the mold surface of the cavity is sucked by the decompression means and reaches the decompression means. The powder release agent that has reached the decompression means may cause a failure of the decompression means.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a casting apparatus in which the amount of the powder release agent that reaches the decompression means is reduced.

  In order to solve the above-mentioned problem, the technical means taken in the present invention has a fixed mold and a movable mold, and a cavity is formed by the fixed mold and the movable mold. A mold, a mold release agent supplying means for supplying a powder mold release agent to the cavity by the first compressed air, and applying the powder mold release agent to a mold surface forming the cavity, and reducing the pressure of the cavity And a decompression means for performing casting by supplying molten metal to the cavity decompressed by the decompression means. The casting apparatus communicates with the cavity, opens to the atmosphere, and passes through the cavity. A flow path through which the compressed air circulates, a recovery means that is provided in the flow path and collects the powder release agent contained in the first compressed air by centrifugal force, and is provided in the flow path. The first compressed air that circulates And a speed increasing means for increasing the flow speed of the first compressed air flowing into the recovery means by joining the second compressed air having a flow velocity higher than that of the compressed air, and the powder contained in the first compressed air After the body release agent is collected by the collection means, the decompression means decompresses the cavity.

  Preferably, as described in claim 2, the speed increasing means includes a cylindrical portion having the flow path therein, and an introduction path provided in the cylindrical portion for introducing the second compressed air into the flow path. It is good to have

  According to the present invention, of the powder release agent supplied to the cavity, the excess that does not adhere to the mold surface forming the cavity is discharged to the outside of the cavity through the flow path together with the first compressed air. It is recovered by the recovery means. In addition, since the flow velocity of the 1st compressed air which flows into a collection | recovery means is increasing by the speed increase means, the collection | recovery means can collect | recover the powder mold release agent contained in 1st compressed air efficiently. After the collection means collects the powder release agent contained in the first compressed air, the decompression means depressurizes the cavity. Therefore, when the decompression means depressurizes the cavity, excess powder separation that does not adhere to the mold surface. There is almost no mold release agent, that is, a powder release agent that can be sucked by the decompression means. Thereby, the powder release agent which reaches | attains a pressure reduction means at the time of casting reduces.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic view of a casting apparatus 100 according to the present invention. The mold D is formed of a fixed mold 1 and a movable mold 2. The fixed mold 1 and the movable mold 2 are respectively provided with a mold surface 1a corresponding to one product surface and a mold surface 2a corresponding to the other product surface. A cavity 3 corresponding to the product shape is formed by the mold surface 1 a of the fixed mold 1 and the mold surface 2 a of the movable mold 2. Further, the fixed mold 1 is provided with an injection sleeve 1 b for supplying molten metal to the cavity 3.

  In the movable mold 2, a supply path 4 is provided on one side (the lower side in FIG. 1) with respect to the mold surface 2a. The supply path 4 communicates with the cavity 3. The supply path 4 is connected to a powder supply device 6 via a connection hose 5. The powder release agent stored in the powder supply device 6 (release agent supply means) is pumped by compressed air A1 (first compressed air), and enters the cavity 3 via the connection hose 5 and the supply path 4. Supplied. The supply path 4 is provided with a shut-off pin 4a. The shut-off pin 4a is connected to the cylinder 4b. The shut-off pin 4a opens and closes the supply path 4 by the operation of the cylinder 4b.

  In the movable mold 2, a decompression path 7 is provided on the other side (upper side in FIG. 1) with respect to the mold surface 2a. The decompression path 7 communicates with the cavity 3 in the same manner as the supply path 4. The decompression path 7 is connected to the decompression means 8. The decompression means 8 includes a valve 8a, a filter 8b, a vacuum tank 8c, and an exhaust pump 8d. The valve 8a is provided between the decompression path 7 and the vacuum tank 8c, and shuts off and connects the decompression path 7 and the vacuum tank 8c. When the valve 8 a is open, the vacuum tank 8 c communicates with the cavity 3 through the decompression path 7. The vacuum tank 8c is connected to the exhaust pump 8d. In the state where the valve 8a is open, the exhaust pump 8d depressurizes the cavity 3 by exhausting the vacuum tank 8c.

  In the fixed mold 1, a discharge path 9 is provided on one side (upper side in FIG. 1) with respect to the mold surface 1 a. The discharge path 9 communicates with the cavity 3. Of the powder release agent supplied to the cavity 3, the excess that does not adhere to the mold surfaces 1 a and 2 a is discharged to the outside of the cavity 3 through the discharge path 9. The discharge path 9 is provided with a shut-off pin 9a. The shut-off pin 9a is connected to the cylinder 9b. The shut-off pin 9a opens and closes the discharge path 9 by the operation of the cylinder 9b.

  The discharge path 9 is connected to a pipe line 25 (flow path). These discharge path 9 and the pipe line 25 form the flow path in the present invention. A cyclonic separator 26 and a suction device 27 are provided in the middle of the conduit 25.

  The cyclonic separation device 26 (recovery means) recovers the powder release agent contained in the compressed air A1 that has passed through the cavity 3. FIG. 2 is a diagram showing the structure of the cyclonic separator 26. The compressed air A1 containing the powder release agent flows into the separation portion 26b through the inlet 26a, and then is separated into a powder release agent having a high specific gravity and air having a low specific gravity by the action of centrifugal force. The The separated powder release agent falls by its own weight and is collected in the collection container 26d through the collection port 26c. On the other hand, the separated air flows out to the conduit 25 through the outlet 26e.

  The suction device 27 (speed increasing means) increases the flow rate of the compressed air A1 that flows into the cyclone separator 26. FIG. 3 is a diagram showing the structure of the suction device 27. The suction device 27 is formed of an inner cylinder part 271, an outer cylinder part 272, and an air supply part 273. The inner cylinder part 271 (cylinder part) is provided with the internal flow path 271a. The diameter of the internal flow path 271a is formed to the same diameter as the pipe line 25. Compressed air A <b> 1 flowing out from the outlet 26 e of the cyclonic separation device 26 flows into the internal channel 271 a through the conduit 25. The inner cylinder part 271 is arranged inside the outer cylinder part 272, and a gap 274 is provided between the inner cylinder part 271 and the outer cylinder part 272 in the radial direction of the inner cylinder part 271 (outer cylinder part 272). It has been. The inner cylinder portion 271 is provided with an introduction path 271b. The introduction path 271 b communicates the internal flow path 271 a of the inner cylinder portion 271 and the gap 274. The outer cylinder part 272 is connected to the air supply part 273. The air supply unit 273 supplies the compressed air A2 (second compressed air) to the gap 274 between the inner cylinder part 271 and the outer cylinder part 272. The supplied compressed air A2 is introduced into the internal flow path 271a via the introduction path 271b, and merges with the compressed air A1 flowing into the internal flow path 271a. The flow rate of the compressed air A2 is set larger than the flow rate of the compressed air A1 flowing into the internal flow path 271a. In this structure, since a pressure difference is generated between the compressed air A2 and the compressed air A1, the compressed air A1 flowing through the conduit 25 is sucked into the internal channel 271a of the inner cylinder portion 271. As a result, the flow rate of the compressed air A1 flowing through the conduit 25, that is, the flow rate of the compressed air A1 flowing into the cyclone separator 26 increases.

  The compressed air A <b> 1 sucked into the internal channel 271 a of the inner cylinder part 271 flows out of the internal channel 271 a together with the compressed air A <b> 2 supplied from the air supply unit 273 and flows through the pipe line 25. Then, the compressed air A <b> 1 and A <b> 2 that have circulated through the pipeline 25 flows out from the end of the pipeline 25 to the atmosphere. A recovery container 28 for recovering the powder release agent that could not be recovered by the cyclone separator 26 is installed at the end of the conduit 25.

  Hereinafter, casting performed by the casting apparatus 100 will be described.

  As shown in FIG. 1, when the cavity 3 is formed by the fixed mold 1 and the movable mold 2, the shutoff pins 4a and 9a open the supply path 4 and the discharge path 9 by the operation of the cylinders 4b and 9b. When the supply path 4 and the discharge path 9 are opened, the powder release agent stored in the powder supply device 6 is supplied into the cavity 3 by the compressed air A1 via the connection hose 5 and the supply path 4. . The powder release agent supplied into the cavity 3 collides with the mold surfaces 1a and 2a forming the cavity 3, and adheres to these mold surfaces 1a and 2a. On the other hand, of the powder release agent supplied into the cavity 3, the excess that does not adhere to the mold surfaces 1 a, 2 a goes outside the cavity 3 through the discharge path 9 and the pipe line 25 together with the compressed air A 1. It is discharged and collected by a cyclonic separator 26 provided in the pipe 25. As described above, since the flow velocity of the compressed air A1 flowing into the cyclone separator 26 is increased by the suction device 27, the cyclone separator 26 efficiently removes the powder release agent contained in the compressed air A1. Can be recovered.

  When the supply of the powder release agent by the powder supply device 6 and the recovery of the powder release agent by the cyclone type separation device 26 are performed for a preset time, the cylinders 4b and 9b are operated, The discharge passage 9 is closed by the shut-off pins 4a and 9a, respectively. In response to this, the valve 8 a of the decompression means 8 is opened, and the exhaust pump 8 d and the vacuum tank 8 c decompress the cavity 3. At this time, since there is almost no powder release agent remaining in the cavity 3, that is, the powder release agent that can be sucked by the decompression means 8, there is no powder release agent that reaches the filter 8b of the decompression means 8. Decrease. Thereby, the life of the filter 8b is extended and the occurrence of a failure or the like in the exhaust pump 8d is prevented.

  When the cavity 3 is depressurized to a predetermined pressure (degree of vacuum), the valve 8b of the depressurizing means 8 is closed, and the molten metal is supplied into the cavity 3 via the injection sleeve 1b. Then, when the set cooling time has elapsed, the movable mold 2 is separated from the fixed mold 1 and the product is taken out from the cavity 3. As a result, one cycle of casting in the casting apparatus is completed.

  In the above description, the example in which the compressed air A1 flowing out from the cyclonic separator 26 flows into the suction device 27 is shown, but the present invention is not limited to this. A structure in which the compressed air A1 and A2 flowing out from the suction device 27 flows into the cyclone separator 26 may be used.

1 is a schematic view of a casting apparatus 100 according to the present invention. The figure which shows the structure of the cyclonic separator 26. The figure which shows the structure of the suction device 27. FIG.

Explanation of symbols

A1 compressed air (first compressed air)
A2 compressed air (second compressed air)
D Mold 1 Fixed mold 1a Mold surface 2 Movable mold 2a Mold surface 3 Cavity 6 Powder supply device (release agent supply means)
8 Pressure reducing means 25 Pipe line (flow path)
26 Cyclone separator (collection means)
27 Suction device (speed increasing means)
100 Casting device 271 Inner cylinder (cylinder)
271b Introduction route

Claims (2)

A mold having a fixed mold and a movable mold, and forming a cavity by the fixed mold and the movable mold;
A mold release agent supplying means for supplying a powder mold release agent to the cavity by the first compressed air, and applying the powder mold release agent to a mold surface forming the cavity;
Decompression means for decompressing the cavity;
With
In a casting apparatus that performs casting by supplying molten metal to the cavity decompressed by the decompression means,
A flow path that communicates with the cavity and opens to the atmosphere and through which the first compressed air that has passed through the cavity flows;
A collecting means provided in the flow path for collecting the powder release agent contained in the first compressed air by centrifugal force;
The first compressed air that flows into the recovery means by joining the first compressed air that is provided in the flow path and flows through the flow path with the second compressed air that has a higher flow velocity than the first compressed air. Speed increasing means for increasing the flow velocity of
With
The casting apparatus, wherein after the collecting means collects the powder release agent contained in the first compressed air, the decompressing means decompresses the cavity. The speed increasing means is
A cylindrical portion having the flow path therein;
An introduction path provided in the cylindrical portion and introducing the second compressed air into the flow path;
The casting apparatus according to claim 1, comprising:

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