Casting manufacturing method, casting manufacturing device, and mold

Abstract

The manufacturing method includes: a preparation step of preparing a mold (20) including a fixed mold (30) and a movable mold (40); an arrangement step for arranging the tube (100) in the mold (20) such that the injection port (103) and the discharge port (107) are exposed from the mold (20) to the outside; a mold closing step for closing the mold (20); a first filling step for filling a third flow path (111) of the main body section (110) of the pipe (100) with a non-compressible fluid by injecting the non-compressible fluid from the injection port (103); a second filling step for filling a molding space (50) formed by the movable mold (40) and the fixed mold (30) with a molten metal material; a discharge step for discharging the non-compressible fluid filled in the third flow path (111) from a discharge port (107); and a removal step for removing the movable mold (40) from the fixed mold (30), opening the mold (20), and removing the casting (140) from which the non-compressible fluid has been discharged from the third flow path (111).

Description

Technical Field

[0001] The invention relates to a method for manufacturing a casting, a device for manufacturing a casting and a mold. Background Art

[0002] Conventionally, a method called insert casting is used in the manufacture of castings. For example, in a casting manufactured by insert casting, a pre-manufactured tube that is different from the casting of the casting itself is assembled. More specifically, in insert casting, a tube is pre-set in a mold for manufacturing a casting, and then a molten metal such as an aluminum alloy is poured into the mold. Thus, a casting assembled with a tube is manufactured. For example, as a casting assembled with a tube, a housing of a drive motor can be cited.

[0003] For example, Patent Document 1 discloses a method for manufacturing a casting in which a smart core filled with a filler material inside a tubular tube is inserted into a mold having a cavity, and after molten metal is injected into the cavity, the filler material inside the smart core is removed. Prior art literature Patent Literature

[0004] Patent document 1: Japanese Patent Application Publication No. 2020-124743. Summary of the invention Problems to be solved by the invention

[0005] However, in Patent Document 1, after the casting with the smart core assembled therein is taken out from the mold, the filling material inside the tubular tube is removed. That is, after the casting is taken out from the mold, the casting needs to be placed in a device for removing the filling material. Therefore, the manufacturing time of the casting may be prolonged.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method and apparatus for manufacturing a casting capable of efficiently removing the incompressible fluid filled in a pipe incorporated in the casting. Means for solving problems

[0007] The present invention relates to a method for manufacturing a casting, the casting comprising: a tube having an inlet for injecting an incompressible fluid, an outlet for discharging the incompressible fluid, and a flow path between the inlet and the outlet and through which the incompressible fluid flows; and a metal material, wherein the tube is casted, the method comprising: a preparation step of preparing a mold including a fixed mold and a movable mold capable of approaching or leaving the fixed mold; an arrangement step of arranging the tube in the mold so that the inlet and the outlet are exposed to the outside from the mold; a mold closing step of bringing the movable mold close to the fixed mold to close the mold; a first filling step of injecting an incompressible fluid from the inlet to fill the flow path with the incompressible fluid; a second filling step of filling a molding space formed by the movable mold and the fixed mold with molten metal material; a discharge step of discharging the incompressible fluid filled in the flow path from the outlet; and a removal step of moving the movable mold away from the fixed mold to open the mold and remove the casting from which the incompressible fluid has been discharged from the flow path.

[0008] According to the manufacturing method of the present invention, a non-compressible fluid is injected from the injection port in a state where the tube is arranged in the mold, and after the molding space is filled with molten metal material, the non-compressible fluid is discharged from the discharge port in a state where the tube is arranged in the mold. In this way, the non-compressible fluid filled in the flow path of the tube is discharged from the discharge port in a state where the casting exists in the mold, so there is no need to set the casting to the device for removing the non-compressible fluid, and the manufacturing time of the casting can be shortened. In addition, when the casting is taken out of the mold in a state where the flow path of the tube is filled with the non-compressible fluid, the non-compressible fluid may scatter to the outside from the injection port or the discharge port of the tube. However, according to the above-mentioned manufacturing method, when the casting is taken out of the mold, the non-compressible fluid is discharged, so the non-compressible fluid will not scatter to the outside.

[0009] In addition, the casting manufacturing device of the present invention comprises: a mold including a fixed mold and a movable mold capable of approaching or leaving the fixed mold, the mold being configured so that when a tube having a first straight portion, a second straight portion and a main body portion is arranged in a molding space formed by the movable mold and the fixed mold, an injection port and a discharge port are exposed to the outside, the first straight portion having the injection port for injecting a non-compressible fluid, the second straight portion having the discharge port for discharging the non-compressible fluid, the main body portion being located between the first straight portion and the second straight portion and having a flow path for circulating the non-compressible fluid; and a fluid conveying device mounted to the injection port and the discharge port of the tube arranged in the molding space, injecting the non-compressible fluid from the injection port and discharging the non-compressible fluid from the discharge port.

[0010] According to the casting manufacturing device of the present invention, the fluid conveying device installed to the injection port and the discharge port of the tube arranged in the molding space injects the incompressible fluid from the injection port and discharges the incompressible fluid from the discharge port. In this way, when the tube is arranged in the mold, the incompressible fluid can be discharged from the discharge port of the tube, so it is not necessary to set the casting to the device for removing the incompressible fluid, and the manufacturing time of the casting can be shortened. In addition, when the incompressible fluid is injected from the injection port and discharged from the discharge port, the relative position relationship between the fluid conveying device and the mold does not change, so the injection and discharge of the incompressible fluid can be performed with high precision.

[0011] In addition, the mold of the present invention includes a fixed mold and a movable mold that can approach or leave the fixed mold, and is configured such that a tube having a first straight portion, a second straight portion and a main body is arranged in a molding space formed by the movable mold and the fixed mold, the first straight portion has an injection port for injecting a non-compressible fluid, the second straight portion has a discharge port for discharging the non-compressible fluid and is parallel to the first straight portion, the main body is located between the first straight portion and the second straight portion and has a flow path for the non-compressible fluid to flow, the fixed mold or the movable mold has: a first holding portion for inserting the first straight portion and holding the first straight portion, and a second holding portion for inserting the second straight portion and holding the second straight portion, and is configured such that, when the first straight portion of the tube is held by the first holding portion and the second straight portion is held by the second holding portion, the main body of the tube does not contact the fixed mold and the movable mold.

[0012] According to the mold of the present invention, the main body of the pipe is not in contact with the fixed mold and the movable mold when the first straight portion of the pipe is held by the first holding portion and the second straight portion is held by the second holding portion. Therefore, when the molding space is filled with molten metal material, the metal material is cast in the entire main body of the pipe. That is, in the manufactured casting, the main body of the pipe is not exposed to the outside. Effects of the Invention

[0013] According to the present invention, a method and an apparatus for producing a casting can be provided, which can efficiently remove the incompressible fluid filled in a pipe incorporated in the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a casting production apparatus according to one embodiment. Figure 2 It is a perspective view schematically showing a tube according to one embodiment. Figure 3 It is a perspective view schematically showing a casting according to one embodiment. Figure 4This is a perspective view of a fixed mold according to one embodiment. Figure 5 This is a side view showing a state where a tube is held by a fixed mold according to an embodiment. Figure 6 This is a flowchart showing a method for producing a casting according to one embodiment. Figure 7 This is a cross-sectional view showing a state in which a mold according to an embodiment is closed. Figure 8 This is a side view showing a state in which the fluid transport device according to one embodiment is connected to a tube held by a fixed mold. Fig. 9 This is a cross-sectional view showing a state in which a casting is manufactured in a mold according to one embodiment. Fig.10 This is a side view schematically showing a state in which the movable mold is separated from the fixed mold and the molds are opened according to one embodiment. DETAILED DESCRIPTION

[0015] Hereinafter, the embodiment of the casting manufacturing device according to the present invention will be described with reference to the accompanying drawings. In addition, the embodiment described here is certainly not intended to specifically limit the present invention. In addition, the same reference numerals are marked on the components and parts that play the same role, and repeated descriptions are appropriately omitted or simplified.

[0016] Figure 1 Schematic diagram of a casting manufacturing device 10 according to the present embodiment. The casting manufacturing device 10 is a device that uses a die casting method, that is, a casting method under high speed and high pressure. Here, the high pressure is, for example, 20 MPa to 100 MPa. The casting manufacturing device 10 is a device that manufactures a tube 100 (see Figure 2 ) and the casting 140 of the metal material 120 of the cast tube 100 (refer to Figure 3 The casting manufacturing device 10 includes a mold 20 and a fluid conveying device 80.

[0017] The tube 100 is formed of a metal having high thermal conductivity (eg, aluminum alloy). Figure 2As shown, the tube 100 has a first straight portion 102, a second straight portion 106 parallel to the first straight portion 102, and a main body 110 located between the first straight portion 102 and the second straight portion 106. The first straight portion 102, the second straight portion 106, and the main body 110 are formed integrally. The first straight portion 102 has an injection port 103 for injecting a non-compressible fluid, and a first flow path 104 connected to the injection port 103 and through which the non-compressible fluid flows. The second straight portion 106 has a discharge port 107 for discharging the non-compressible fluid, and a second flow path 108 connected to the discharge port 107 and through which the non-compressible fluid flows. The first straight portion 102 and the second straight portion 106 have the same length from the main body 110, but may be different. The first straight portion 102 and the second straight portion 106 extend from the main body 110 in the same direction. That is, the injection port 103 and the discharge port 107 open in the same direction. The main body 110 has a third flow path 111 for the non-compressible fluid to flow. The third flow path 111 communicates with the first flow path 104 and the second flow path 108. That is, the third flow path 111 communicates with the injection port 103 and the discharge port 107. The third flow path 111 is an example of a flow path. The main body 110 is formed in a spiral shape. In addition, the shape of the main body 110 is not limited to the spiral shape.

[0018] like Figure 3 As shown, the casting 140 includes the tube 100 and the metal material 120 in which the tube 100 is cast. The tube 100 and the metal material 120 are integrated. A part of the first straight portion 102, a part of the second straight portion 106, and the entire body 110 of the tube 100 are covered by the metal material 120. A part of the first straight portion 102 including the injection port 103 and a part of the second straight portion 106 including the discharge port 107 are exposed to the outside from the metal material 120. The metal material 120 is, for example, the same metal as the tube 100. In addition, the metal material 120 and the tube 100 may be different metals. The casting 140 can be used as a housing of a drive motor, etc., for example.

[0019] like Figure 1 As shown, the mold 20 includes a fixed mold 30 and a movable mold 40 that can approach or leave the fixed mold 30. A cavity 31 (see FIG. 1 ) for forming a portion of the casting 140 is formed in the fixed mold 30. Figure 7 The fixed mold 30 includes a recessed portion 30M that is recessed from the outer surface 30F (the surface opposite to the movable mold 40) toward the cavity 31. The movable mold 40 is formed with a core portion 41 (see Figure 7 When the movable mold 40 is brought close to the fixed mold 30 and the mold 20 is closed, a molding space 50 is formed by the movable mold 40 and the fixed mold 30 (refer to Figure 7 ). The tube 100 is provided in the molding space 50. The molding space 50 is divided by the cavity 31 and the core 41.

[0020] like Figure 4 As shown, the fixed mold 30 includes a first holding portion 32 for holding the first straight portion 102 of the pipe 100 and a second holding portion 36 for holding the second straight portion 106 of the pipe 100. The first holding portion 32 and the second holding portion 36 are through holes formed in the fixed mold 30. The first holding portion 32 and the second holding portion 36 are connected to the recess 30M.

[0021] like Figure 5 As shown, the first straight portion 102 is inserted into the first holding portion 32. The inner diameter of the first holding portion 32 and the outer diameter of the first straight portion 102 are set so that when the first straight portion 102 is inserted into the first holding portion 32, the first straight portion 102 is held in the first holding portion 32, and no shaking occurs between the first straight portion 102 and the first holding portion 32. The inner diameter of the first holding portion 32 is substantially the same as the outer diameter of the first straight portion 102. The length of the first holding portion 32 in the longitudinal direction is set so that when the first straight portion 102 is held in the first holding portion 32, the first straight portion 102 is exposed to the outside of the mold 20 (here, the fixed mold 30). The length of the first holding portion 32 in the longitudinal direction is shorter than the length of the first straight portion 102 in the longitudinal direction. When the first straight portion 102 is inserted into the first holding portion 32 (that is, when the tube 100 is arranged in the molding space 50), a portion of the first straight portion 102 is exposed to the outside of the mold 20 (here, the fixed mold 30). That is, the injection port 103 is exposed to the outside of the fixed mold 30. The injection port 103 is located in the recessed portion 30M of the fixed mold 30. In addition, the injection port 103 may be located outside the recessed portion 30M.

[0022] like Figure 5As shown, the second straight portion 106 is inserted into the second holding portion 36. The inner diameter of the second holding portion 36 and the outer diameter of the second straight portion 106 are set so that when the second straight portion 106 is inserted into the second holding portion 36, the second straight portion 106 is held in the second holding portion 36, and no shaking occurs between the second straight portion 106 and the second holding portion 36. The inner diameter of the second holding portion 36 is substantially the same as the outer diameter of the second straight portion 106. The length of the second holding portion 36 in the longitudinal direction is set so that when the second straight portion 106 is held in the second holding portion 36, the second straight portion 106 is exposed to the outside from the mold 20 (here, the fixed mold 30). The length of the second holding portion 36 in the longitudinal direction is shorter than the length of the second straight portion 106 in the longitudinal direction. When the second straight portion 106 is inserted into the second holding portion 36 (that is, when the tube 100 is arranged in the molding space 50), a part of the second straight portion 106 is exposed to the outside of the mold 20 (here, the fixed mold 30). That is, the discharge port 107 is exposed to the outside of the fixed mold 30. The discharge port 107 is located in the recess 30M of the fixed mold 30. In addition, the discharge port 107 may be located at a position outside the recess 30M. It should be noted that the first straight portion 102 and the second straight portion 106 may not be exposed to the outside from the mold 20 (here, the fixed mold 30). In this case, for example, the incompressible fluid may be injected into the injection port 103 of the tube 100 via the first holding portion 32, and the incompressible fluid may be discharged from the discharge port 107 of the tube 100 via the second holding portion 36.

[0023] like Figure 5 As shown in FIG. 1 , the tube 100 is held in the fixed mold 30 in a state where the first straight portion 102 of the tube 100 is held in the first holding portion 32 and the second straight portion 106 is held in the second holding portion 36. That is, the tube 100 is held in the fixed mold 30 only by the first holding portion 32 and the second holding portion 36. In a state where the first straight portion 102 of the tube 100 is held in the first holding portion 32 and the second straight portion 106 is held in the second holding portion 36, the main body 110 of the tube 100 is not in contact with the fixed mold 30 and the movable mold 40 (see FIG. 1 ). Figure 7 ). In other words, a gap is provided between the entire body 110 of the tube 100 and the fixed mold 30 and the movable mold 40. That is, the tube 100 is held in the fixed mold 30 with the body 110 suspended in the air. In addition, in the present embodiment, the first holding portion 32 and the second holding portion 36 are provided in the fixed mold 30, but may be provided in the movable mold 40.

[0024] like Figure 1As shown, the fixed mold 30 includes a first pressing portion 38 for pressing the first straight portion 102 of the tube 100 from the side and a second pressing portion 39 for pressing the second straight portion 106 of the tube 100 from the side. The first pressing portion 38 and the second pressing portion 39 are, for example, rod-shaped members. The first pressing portion 38 is configured to be received in a first receiving hole 32H formed in the fixed mold 30 and to move in the first receiving hole 32H. The first receiving hole 32H extends in a direction intersecting (for example, a direction orthogonal to) the first holding portion 32. The second pressing portion 39 is configured to be received in a second receiving hole 36H formed in the fixed mold 30 and to move in the second receiving hole 36H. The second receiving hole 36H extends in a direction intersecting (for example, a direction orthogonal to) the second holding portion 36. The first pressing portion 38 and the second pressing portion 39 are configured to press the first straight portion 102 and the second straight portion 106 from the side, respectively, after the tube 100 is filled with an incompressible fluid. In addition, the first pressing portion 38 and the second pressing portion 39 may also be configured to press the first straight portion 102 and the second straight portion 106 from the side, respectively, before the tube 100 is filled with the incompressible fluid. The first pressing portion 38 and the second pressing portion 39 are controlled to move by, for example, a solenoid not shown. The first pressing portion 38 fixes the first straight portion 102 at a predetermined position by pressing the first straight portion 102 from the side. The second pressing portion 39 fixes the second straight portion 106 at a predetermined position by pressing the second straight portion 106 from the side. In addition, in the present embodiment, the first pressing portion 38 and the second pressing portion 39 are provided in the fixed mold 30, but in the case where the movable mold 40 is provided with the first holding portion 32 and the second holding portion 36, they may also be provided in the movable mold 40. In addition, only at least one of the first pressing portion 38 and the second pressing portion 39 may be provided.

[0025] like Figure 7 As shown, the mold 20 includes a sliding portion 35. The sliding portion 35 is a part of the fixed mold 30. The sliding portion 35 is a component inserted into the spiral portion of the main body 110 of the tube 100 arranged in the molding space 50. The sliding portion 35 has a cylindrical shape. The sliding portion 35 does not contact the main body 110. The sliding portion 35 is configured to be relatively movable relative to the tube 100.

[0026] like Figure 1 As shown, the fluid conveying device 80 is a device separate from the mold 20. The fluid conveying device 80 is a device that injects an incompressible fluid into the injection port 103 of the tube 100. The fluid conveying device 80 is a device that discharges and recovers the incompressible fluid from the discharge port 107 of the tube 100. The incompressible fluid is not particularly limited as long as it is a fluid that suppresses deformation of the tube 100 even when a load is applied to the tube 100 by filling the inside of the tube 100. The incompressible fluid is, for example, oil (e.g., hydraulic oil). The fluid conveying device 80 is installed in the molding space 50 (see Figure 7 ) is configured with an injection port 103 and an exhaust port 107 of a tube 100. The fluid conveying device 80 includes a conveying portion 82 for delivering an incompressible fluid and a recovery portion 84 for recovering the incompressible fluid. The conveying portion 82 and the recovery portion 84 are, for example, hoses having pressure resistance and heat resistance. The conveying portion 82 is mounted on the first straight portion 102 of the tube 100. The conveying portion 82 is communicated with the injection port 103 of the first straight portion 102. The recovery portion 84 is mounted on the second straight portion 106 of the tube 100. The recovery portion 84 is communicated with the exhaust port 107 of the second straight portion 106. In addition, the method of mounting the conveying portion 82 on the first straight portion 102 and the method of mounting the recovery portion 84 on the second straight portion 106 are not particularly limited. For example, assembly and disassembly can also be performed by a connector (one-touch connector) or the like.

[0027] Next, a method for manufacturing the casting 140 according to the present embodiment will be described. Figure 6 1 is a flow chart showing a method for manufacturing the casting 140 (hereinafter referred to as the manufacturing method). Figure 6 As shown, the manufacturing method includes a preparation process (step S10), a configuration process (step S20), a mold clamping process (step S30), a first filling process (step S40), a second filling process (step S50), a discharge process (step S60) and a disassembly process (step S70). Figure 1 As shown, a casting 140 is manufactured using a casting manufacturing device 10 having a mold 20 and a fluid conveying device 80 (see Figure 3 ). In addition, Figure 7~Figure 10 In FIG. 1 , the direction in which the movable mold 40 moves relative to the fixed mold 30 is defined as a mold moving direction P, the direction in which the movable mold 40 approaches the fixed mold 30 is defined as P1, and the direction in which the movable mold 40 moves away from the fixed mold 30 is defined as P2.

[0028] First, in the preparation process (step S10), Figure 1 As shown, a mold 20 including a fixed mold 30 and a movable mold 40 that can approach or leave the fixed mold 30 is prepared.

[0029] Next, in the placement step (step S20), the tube 100 is placed in the mold 20. More specifically, Figure 5 As shown, the first straight portion 102 of the tube 100 is inserted into the first holding portion 32 of the fixed mold 30 and held in the first holding portion 32, and the second straight portion 106 of the tube 100 is inserted into the second holding portion 36 of the fixed mold 30 and held in the second holding portion 36. As a result, the injection port 103 of the first straight portion 102 and the discharge port 107 of the second straight portion 106 are exposed to the outside of the mold 20 (here, the fixed mold 30) (see Figure 1 ).

[0030] Next, in the mold closing process (step S30), as Figure 7 As shown in FIG. 1 , the movable mold 40 is brought close to the fixed mold 30 to close the mold 20. That is, the movable mold 40 is moved toward Figure 7 The movable mold 40 moves in the direction of the arrow P1 to close the fixed mold 30. Thus, the molding space 50 of the molded casting 140 is divided by the cavity 31 of the fixed mold 30 and the core 41 of the movable mold 40. In addition, before the movable mold 40 is brought close to the fixed mold 30, the sliding portion 35 (also refer to Figure 1 ) is moved and arranged in the main body 110 of the tube 100. In the state where the mold 20 is closed, the main body 110 of the tube 100 does not contact the fixed mold 30 and the movable mold 40. Only the first straight portion 102 and the second straight portion 106 of the tube 100 contact the mold 20 (here, the fixed mold 30).

[0031] Next, in the first filling process (step S40), an incompressible fluid (for example, oil) is injected from the injection port 103 of the first linear portion 102 to fill the third flow path 111 of the main body 110 with the incompressible fluid. Figure 8 As shown, the conveying portion 82 of the fluid conveying device 80 is mounted on the first straight portion 102 of the tube 100 by a one-touch joint or the like, and the recovery portion 84 of the fluid conveying device 80 is mounted on the second straight portion 106 of the tube 100 by a one-touch joint or the like. Then, the incompressible fluid is filled into the first flow path 104, the second flow path 108, and the third flow path 111 of the tube 100 from the fluid conveying device 80 via the injection port 103. After the filling of the incompressible fluid into the tube 100 is completed, the fluid conveying device 80 can be removed from the tube 100 or can be kept in the installed state. In addition, after the filling of the incompressible fluid into the tube 100 is completed, the first pressing portion 38 presses the first straight portion 102 of the tube 100 from the side, and the second pressing portion 39 presses the second straight portion 106 of the tube 100 from the side, thereby fixing the first straight portion 102 and the second straight portion 106 at a predetermined position. In addition, in the present embodiment, the first filling step (step S40 ) is performed after the mold closing step (step S30 ), but the mold closing step (step S30 ) may be performed after the first filling step (step S40 ).

[0032] Next, in the second filling step S50, the molding space 50 formed by the movable mold 40 and the fixed mold 30 is filled with a molten metal material. As the metal material, for example, an aluminum alloy can be cited. In addition, the molten metal material (melt) is filled into the molding space 50 from an injection port (not shown) provided in the fixed mold 30. And, the molten metal material (melt) is cooled and solidified in the mold 20. Here, cooling in this specification refers to cooling for solidifying the melt.

[0033] Next, in the discharge process (step S60), the incompressible fluid filled in the third flow path 111 of the main body 110 is discharged from the discharge port 107 of the second straight portion 106 of the casting 140. Fig. 9 As shown, the fluid conveying device 80 is driven to discharge the incompressible fluid from the discharge port 107 of the second straight portion 106 of the tube 100 to the fluid conveying device 80. The incompressible fluid discharged from the discharge port 107 is recovered by the fluid conveying device 80. And, after the incompressible fluid is discharged from the tube 100, the fluid conveying device 80 is removed from the tube 100. The discharge process (step S60) is performed in a state where the casting 140 is arranged in the mold 20. It should be noted that the discharge process (step S60) can be performed after the molten metal in the mold 20 is completely solidified, or it can be performed in the middle of the solidification of the molten metal. That is, the discharge of the incompressible fluid can be started after the solidification time (the time required for cooling to solidify the molten metal) has passed, or the discharge of the incompressible fluid can be started before the solidification time has passed.

[0034] Next, in the removal process (step S70), Fig.10 As shown in FIG. 1 , the movable mold 40 is separated from the fixed mold 30 and the mold 20 is opened. Fig.10 The movable mold 40 is moved in the direction of the arrow P2 to separate the movable mold 40 from the fixed mold 30. At this time, the molded casting 140 is fixed to the movable mold 40. Then, a core pin (not shown) is pressed against the casting 140 fixed to the movable mold 40, and the casting 140 from which the incompressible fluid is discharged from the third flow path 111 of the main body 110 of the pipe 100 is removed from the movable mold 40. In this way, the casting 140 having the pipe 100 and the metal material 120 in which the pipe 100 is cast is molded.

[0035] As described above, according to the manufacturing method of the present embodiment, the incompressible fluid is injected from the injection port 103 in a state where the tube 100 is arranged in the mold 20, and after the molding space 50 is filled with the molten metal material, the incompressible fluid is discharged from the discharge port 107 in a state where the tube 100 is arranged in the mold 20. In this way, the incompressible fluid filled in the third flow path 111 of the main body 110 of the tube 100 is discharged from the discharge port 107 in a state where the casting 140 exists in the mold 20, so it is not necessary to provide the casting 140 to the device for removing the incompressible fluid, and the manufacturing time of the casting 140 can be shortened. In addition, when the casting 140 is taken out from the mold 20 in a state where the third flow path 111 of the main body 110 of the tube 100 is filled with the incompressible fluid, there is a possibility that the incompressible fluid will scatter to the outside from the injection port 103 or the discharge port 107 of the tube 100. However, according to the above-described manufacturing method, the incompressible fluid is discharged when the casting 140 is taken out from the mold 20 , so the incompressible fluid does not scatter to the outside.

[0036] Furthermore, according to the casting manufacturing device 10 of the present embodiment, the fluid conveying device 80 attached to the injection port 103 and the discharge port 107 of the tube 100 arranged in the molding space 50 injects the incompressible fluid from the injection port 103 and discharges the incompressible fluid from the discharge port 107. In this way, the incompressible fluid can be discharged from the discharge port 107 of the tube 100 in a state where the tube 100 is arranged in the mold 20, so it is not necessary to provide the casting 140 with a device for removing the incompressible fluid, and it is possible to shorten the manufacturing time of the casting 140. In addition, when the incompressible fluid is injected from the injection port 103 and when the incompressible fluid is discharged from the discharge port 107, the relative positional relationship between the fluid conveying device 80 and the mold 20 does not change, so the incompressible fluid can be injected and discharged with high precision.

[0037] In addition, according to the mold 20 of the present embodiment, the main body 110 of the pipe 100 is configured not to contact the fixed mold 30 and the movable mold 40 when the first straight portion 102 of the pipe 100 is held by the first holding portion 32 and the second straight portion 106 is held by the second holding portion 36. Therefore, when the molding space 50 is filled with molten metal material, the metal material is cast in the entire main body 110 of the pipe 100. That is, in the manufactured casting 140, the main body 110 of the pipe 100 is not exposed to the outside.

[0038] In the mold 20 of the present embodiment, the lengths of the first holding portion 32 and the second holding portion 36 are set so that the first straight portion 102 and the second straight portion 106 of the tube 100 are exposed to the outside from the mold 20 when the first straight portion 102 is held by the first holding portion 32 and the second straight portion 106 is held by the second holding portion 36. According to the above embodiment, the fluid transport device 80 can be easily attached to the first straight portion 102 and the second straight portion 106 exposed to the outside from the mold 20.

[0039] In the mold 20 of the present embodiment, the fixed mold 30 including the first holding portion 32 and the second holding portion 36 includes the first pressing portion 38 for pressing the first straight portion 102 from the side and the second pressing portion 39 for pressing the second straight portion 106 from the side. According to the above, the first straight portion 102 and / or the second straight portion 106 of the tube 100 can be fixed at a predetermined position.

[0040] The preferred embodiments of the present invention have been described above, but the above embodiments are merely examples, and the present invention can be implemented in various other forms. Description of Reference Numerals

[0041] 10Casting manufacturing equipment 20 molds 30 fixed mold 32 first holding part 36 Second holding part 38 first pressing part 39 second pressing part 40 movable mold 50 molding space 80 Fluid delivery device 82 conveying department 84 Recycling Department 100 tubes 102 first straight line 103 injection port 104 first flow path 106 Second straight line 107 Exit 108 Second flow path 110 Main body 111Third flow path (flow path) 120 Metal Materials 140 castings.

Claims

1. A method of manufacturing a casting, The casting has: A pipe having an inlet for injecting an incompressible fluid, an outlet for discharging the incompressible fluid, and a flow path between the inlet and the outlet for the incompressible fluid to flow; as well as Metal material, cast in the tube, The manufacturing method comprises: A preparation step of preparing a mold including a fixed mold and a movable mold capable of approaching or leaving the fixed mold; a disposing step of disposing the tube in the mold so that the injection port and the discharge port are exposed to the outside from the mold; A mold closing step, wherein the movable mold is brought close to the fixed mold to close the mold; a first filling step of injecting an incompressible fluid from the injection port to fill the flow path with the incompressible fluid; a second filling step of filling a molding space formed by the movable mold and the fixed mold with molten metal material; a discharging step of discharging the incompressible fluid filled in the flow path from the discharge port; and The removing step is to separate the movable mold from the fixed mold, open the mold, and remove the casting from which the incompressible fluid has been discharged from the flow path.

2. A casting manufacturing device, comprising: A mold including a fixed mold and a movable mold capable of approaching or leaving the fixed mold, the mold being configured such that when a tube having a first straight portion, a second straight portion, and a main body is arranged in a molding space formed by the movable mold and the fixed mold, an injection port and an exhaust port are exposed to the outside, the first straight portion having the injection port for injecting an incompressible fluid, the second straight portion having the exhaust port for exhausting the incompressible fluid, and the main body being located between the first straight portion and the second straight portion and having a flow path for the incompressible fluid to flow; and The fluid conveying device is attached to the injection port and the discharge port of the tube arranged in the molding space, and injects the incompressible fluid from the injection port and discharges the incompressible fluid from the discharge port.

3. A mold, comprising a fixed mold and a movable mold that can approach or leave the fixed mold, wherein the mold is configured such that a tube having a first straight portion, a second straight portion, and a main body portion is arranged in a molding space formed by the movable mold and the fixed mold, the first straight portion has an injection port for injecting an incompressible fluid, the second straight portion has an outlet for discharging the incompressible fluid and is parallel to the first straight portion, the main body portion is located between the first straight portion and the second straight portion and has a flow path for the incompressible fluid to flow, The fixed mold or the movable mold includes: a first holding portion into which the first straight line portion is inserted and holds the first straight line portion, and a second holding portion into which the second straight line portion is inserted and holds the second straight line portion. The mold is configured such that the main body of the tube does not contact the fixed mold and the movable mold in a state in which the first straight portion of the tube is held by the first holding portion and the second straight portion is held by the second holding portion.

4. The mold according to claim 3, wherein: The lengths of the first holding portion and the second holding portion are set so that the first straight portion and the second straight portion of the tube are exposed to the outside from the mold when the first straight portion is held by the first holding portion and the second straight portion is held by the second holding portion.

5. The mold according to claim 3 or 4, wherein: The fixed mold or the movable mold including the first holding portion and the second holding portion includes at least one of a first pressing portion that presses the first straight portion from the side and a second pressing portion that presses the second straight portion from the side.

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