Manufacturing method of cast product and die

Abstract

To provide a die which can manufacture a cast product in which a pipe is disposed at a predetermined position.SOLUTION: A die 20 includes: a die body 25 having a fixed die 30 and a movable die 40 which may move close to or away from the fixed die 30; a forming space 60 which is defined by the fixed die 30 and the movable die 40 and in which a pipe 100 may be disposed; an injection port 65 through which a melted metallic material 120 may be injected into the forming space 60; a holding part 42 which holds both ends of the pipe 100; and protruding parts 70 which inhibit the pipe 100 from moving in the forming space 60 when the melted metallic material 120 is injected into the forming space 60.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a mold, a casting manufacturing apparatus, a casting manufacturing method, and a casting. [Background technology]

[0002] A method called insert casting has been used for the manufacture of castings. For example, a casting manufactured by insert casting incorporates a pipe (e.g., a hollow pipe) that is manufactured in advance separately from the casting of the casting itself. More specifically, in insert casting, a hollow pipe is placed in advance in a metal mold for manufacturing the casting, and then molten metal of a molten metal material such as an aluminum alloy is poured into the metal mold. This produces a casting incorporating a hollow pipe. For example, a case of a drive motor is an example of a casting incorporating a hollow pipe.

[0003] For example, Patent Document 1 discloses a method for manufacturing a casting in which a smart core, the inside of which is a tubular pipe filled with a filler material, is inserted into a mold in which a cavity is formed, molten metal is injected into the cavity, and then the filler material inside the smart core is removed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-124743 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, when molten metal is poured into a mold cavity with the smart core placed therein, the position of the smart core may move within the cavity. Depending on the shape of the smart core, it may be deformed by the flow of molten metal into the cavity, making it impossible to manufacture the desired casting.

[0006] The present invention has been made in consideration of these points, and its object is to provide a casting in which pipes are arranged in predetermined positions, a mold for producing the casting, an apparatus for producing the casting, and a method for producing the casting. [Means for solving the problem]

[0007] The mold of the present invention comprises a mold body having a fixed mold and a movable mold that can approach or move away from the fixed mold, a molding space partitioned by at least the fixed mold and the movable mold and in which a pipe can be placed, an injection port through which molten metal material can be injected into the molding space, holding portions that hold both ends of the pipe, and an inhibitor member that inhibits the pipe from moving within the molding space when the molten metal material is injected into the molding space.

[0008] The mold according to the present invention includes a suppressing member that suppresses the movement of the pipe within the molding space when the molten metal material is injected into the molding space. According to the above aspect, the suppressing member can keep the pipe in a predetermined position in the molding space, so that a casting can be manufactured in which the pipe is precisely positioned in the predetermined position.

[0009] The casting manufacturing apparatus of the present invention comprises a mold including a fixed mold, a movable mold capable of approaching or moving away from the fixed mold, a molding space partitioned by at least the fixed mold and the movable mold and capable of arranging a pipe, an injection port capable of injecting molten metal material into the molding space, holding portions for holding both ends of the pipe, and a suppression member for suppressing movement of the pipe within the molding space when the molten metal material is injected into the molding space; and a metal material transport device that injects the molten metal material from the injection port into the molding space.

[0010] The mold of the casting manufacturing apparatus according to the present invention includes a suppressing member that suppresses the movement of the pipe within the molding space when the molten metal material is injected into the molding space. According to the above aspect, when the metal material transport device injects the molten metal material into the molding space through the injection port, the suppressing member can keep the pipe at a predetermined position in the molding space, so that a casting can be manufactured in which the pipe is precisely positioned at the predetermined position.

[0011] The manufacturing method of the present invention is a manufacturing method for a casting comprising a pipe and a metal material encasing the pipe, and includes the following steps: a preparation step of preparing a mold comprising a fixed mold, a movable mold capable of approaching or moving away from the fixed mold, a molding space partitioned by at least the fixed mold and the movable mold and in which the pipe can be placed, an injection port through which molten metal material can be injected into the molding space, a holding portion for holding both ends of the pipe, and a suppression member for suppressing movement of the pipe within the molding space when the molten metal material is injected into the molding space; an arrangement step of holding the pipe in the holding portion so that the pipe contacts the suppression member and arranging the pipe in the molding space; a mold clamping step of bringing the movable mold close to the fixed mold and closing the mold; a filling step of injecting the molten metal material into the molding space from the injection port to fill the molding space with the molten metal material; and a removal step of moving the movable mold away from the fixed mold to open the mold and remove the casting.

[0012] According to the manufacturing method of the present invention, in the arranging step, the pipe is held by the holding part so that the pipe contacts the suppressing member, and the pipe is arranged in the molding space. According to the above aspect, when the molten metal material is injected into the molding space from the injection port in the filling step to fill the molding space with the molten metal material, the suppressing member suppresses the pipe from moving in the molding space, so that the pipe can be kept in a predetermined position in the molding space, and a casting in which the pipe is precisely arranged in the predetermined position can be manufactured.

[0013] The casting of the present invention comprises a pipe and a metal material cast around the pipe, the pipe having a first end, a second end, and a middle portion located between the first end and the second end, the first end and the second end protruding to the outside from the metal material, and a portion of the middle portion being exposed to the outside from the metal material.

[0014] According to the casting of the present invention, a part of the middle part of the pipe is exposed to the outside from the metal material. According to the above-mentioned aspect, the heat dissipation of the solvent passing through the pipe is improved. Furthermore, the other part of the middle part is not exposed to the outside from the metal material and is protected by the metal material. In this way, by exposing a part of the middle part to the outside from the metal material, it is possible to provide a casting that is optimal for the intended use and the environment in which it is used.

[0015] Another casting according to the present invention comprises a pipe and a metal material cast around the pipe, the pipe having a first end, a second end aligned with the first end in a predetermined direction, and a midway portion located between the first end and the second end, the midway portion being formed in a spiral shape extending in the predetermined direction, and the metal material having an inner circumferential surface located radially inward from the midway portion when viewed from the predetermined direction, and a recessed portion recessed radially outward from the inner circumferential surface.

[0016] In another casting according to the present invention, the metal material has an inner circumferential surface located radially inward from the middle portion when viewed from a predetermined direction, and a recessed portion recessed radially outward from the inner circumferential surface. According to the above aspect, the surface area of ​​the inner circumferential surface of the metal material is increased, improving cooling performance. Effect of the Invention

[0017] According to the present invention, it is possible to provide a casting having pipes arranged at predetermined positions, a mold for producing the casting, an apparatus for producing a casting, and a method for producing a casting. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram of an apparatus for manufacturing a casting according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view that typically shows a hollow pipe. [Figure 3A] FIG. 3A is a perspective view that illustrates a casting according to the first embodiment. FIG. [Figure 3B] FIG. 3B is a side view that diagrammatically shows the casting according to the first embodiment. [Figure 4] FIG. 4 is a perspective view of the movable mold according to the first embodiment. [Diagram 5] FIG. 5 is a perspective view showing a state in which a hollow pipe is attached to the movable mold according to the first embodiment. [Figure 6] FIG. 6 is a perspective view showing a state in which a hollow pipe is disposed in the fixed mold according to the first embodiment. [Figure 7] FIG. 7 is a perspective view showing a state in which a hollow pipe is disposed in the core according to the first embodiment. [Figure 8] FIG. 8 is a perspective view showing a state in which a slide core is inserted into the middle part of the hollow pipe according to the first embodiment. [Figure 9] FIG. 9 is a perspective view of the slide core according to the first embodiment. [Figure 10] FIG. 10 is a side view showing the positional relationship between the protruding member, the protruding portion, and the hollow pipe when the hollow pipe is placed in the molding space. [Figure 11] FIG. 11 is a flow chart showing a method for manufacturing a casting. [Figure 12] FIG. 12 is a perspective view of a slide core according to a modified example. [Figure 13] FIG. 13 is a side view according to a modified example, showing the positional relationship between the protruding member, the protruding portion, and the hollow pipe when the hollow pipe is placed in the molding space. [Figure 14] FIG. 14 is a perspective view that illustrates a casting according to a modified example. [Figure 15] FIG. 15 is a schematic diagram of an apparatus for manufacturing a casting according to the second embodiment. [Figure 16]FIG. 16 is a perspective view that illustrates a casting according to the second embodiment. [Figure 17] FIG. 17 is a perspective view of a movable mold according to the second embodiment. [Figure 18] FIG. 18 is a perspective view showing a state in which a hollow pipe is attached to the movable mold according to the second embodiment. [Figure 19] FIG. 19 is a perspective view showing a state in which a hollow pipe is disposed in a fixed mold according to the second embodiment. [Figure 20] FIG. 20 is a perspective view showing a state in which a hollow pipe is disposed in the core according to the second embodiment. [Figure 21] FIG. 21 is a side view showing the positional relationship between the recessed groove, the protrusion and the hollow pipe when the hollow pipe is placed in the molding space. [Figure 22] FIG. 22 is a front view showing the positional relationship between a movable-side protruding member and a hollow pipe according to a first modified example. [Diagram 23] FIG. 23 is a plan view showing the positional relationship between a movable-side protruding member and a hollow pipe according to the second modified example. [Figure 24] FIG. 24 is a perspective view of a movable mold according to the first modified example. [Diagram 25] FIG. 25 is a perspective view of a movable mold according to the second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of a casting manufacturing apparatus according to the present invention will be described with reference to the drawings. Note that the embodiment described here is not intended to limit the present invention in any particular way. Also, the same reference numerals are used for members and parts that perform the same functions, and duplicated descriptions will be omitted or simplified as appropriate.

[0020] First Embodiment FIG. 1 is a schematic diagram of a casting manufacturing apparatus 10 according to the present embodiment. The casting manufacturing apparatus 10 is an apparatus that uses a die casting method, that is, a casting method at high speed and high pressure (so-called high pressure casting). Here, the high pressure is, for example, 20 MPa to 100 MPa. The casting manufacturing apparatus 10 is an apparatus that manufactures a casting 140 (see FIG. 3A) including a hollow pipe 100 (see FIG. 2) and a metal material 120 (see FIG. 3A) that casts the hollow pipe 100. The casting manufacturing apparatus 10 includes a mold 20, a filler conveying device 80, and a metal material conveying device 90. Here, the direction in which a movable mold 40 described later moves relative to a fixed mold 30 is defined as a first direction D1, the direction perpendicular to the first direction D1 in a plan view is defined as a second direction D2, and the up-down direction is defined as a third direction D3. The second direction D2 is an example of a predetermined direction. However, the above directions are merely defined for the convenience of explanation, and do not limit the manner in which the mold 20 is installed, nor do they limit the present invention.

[0021] The hollow pipe 100 is made of a metal (e.g., an aluminum alloy) with high thermal conductivity. The hollow pipe 100 is an example of a pipe. The hollow pipe 100 has a circular cross section. The hollow pipe 100 is not limited to a circular cross section, and may have an elliptical cross section, for example. As shown in FIG. 2, the hollow pipe 100 has a linear first end 102, a linear second end 106 parallel to the first end 102, and a middle portion 110 located between the first end 102 and the second end 106. The first end 102, the second end 106, and the middle portion 110 are integrally formed. The first end 102 has an inlet 103 through which an incompressible fluid is injected. The second end 106 has an outlet 107 through which the incompressible fluid is discharged. The first end 102 and the second end 106 have the same length from the middle portion 110, but may be different. The first end 102 and the second end 106 are aligned in the second direction D2. The first end 102 and the second end 106 extend in the same direction from the middle portion 110. That is, the inlet 103 and the outlet 107 open in the same direction. The inlet 103 and the outlet 107 may open in different directions. The middle portion 110 is formed in a spiral shape extending in the second direction D2. The middle portion 110 has a plurality of bent portions 112 bent in an arc shape. The bent portions 112 are aligned in the second direction D2. When the hollow pipe 100 is cast in the metal material 120, the bent portions 112 are covered by the metal material 120 and are not exposed to the outside. 5, the midway portion 110 has a plurality of locked portions 113 arranged in the second direction D2. The locked portions 113 are part of the bent portion 112. The shape of the midway portion 110 is not limited to a spiral shape.

[0022] As shown in FIG. 3A, the casting 140 includes a hollow pipe 100 and a metal material 120 that casts around the hollow pipe 100. The hollow pipe 100 and the metal material 120 are integrated together. A part of the first end 102, a part of the second end 106, and the entire middle portion 110 (i.e., the entire bent portion 112) of the hollow pipe 100 are covered with the metal material 120. A part of the first end 102 including the inlet 103 and a part of the second end 106 including the outlet 107 are exposed to the outside from the metal material 120. The metal material 120 is, for example, the same metal as the hollow pipe 100. Note that the metal material 120 and the hollow pipe 100 may be different metals. As shown in FIG. 3A and FIG. 3B, the metal material 120 has an inner circumferential surface 122 located radially inward from the middle portion 110 when viewed from the second direction D2, an outer circumferential surface 123 located radially outward from the middle portion 110, and a recess 124 recessed radially outward from the inner circumferential surface 122. The recess 124 extends in the second direction D2. The recess 124 opens in the second direction D2 at one end of the inner circumferential surface 122 in the second direction D2. The recess 124 may also open in the second direction D2 at the other end of the inner circumferential surface 122 in the second direction D2. The recess 124 is provided at equal intervals in the circumferential direction of the inner circumferential surface 122. Here, the metal material 120 has three recesses 124, but the number of recesses 124 is not limited to three. A part of the middle portion 110 may be exposed to the outside at the recess 124. The casting 140 may be used, for example, as a drive motor case, or the like.

[0023] As shown in FIG. 1, the mold 20 includes a mold body 25. The mold body 25 includes a fixed mold 30, a movable mold 40 that can approach or move away from the fixed mold 30, a core 50 at least a part of which is located between the fixed mold 30 and the movable mold 40, and a slide core 150 at least a part of which is located between the fixed mold 30 and the movable mold 40. The fixed mold 30 is formed with a cavity portion 31 (see FIG. 6) used to form a part of the casting 140. The movable mold 40 is formed with a core portion 41 (see FIG. 4) used to form a part of the casting 140. The core 50 is a member that slides in the third direction D3. The slide core 150 is a member that slides in the second direction D2. The slide core 150 is formed in a cylindrical shape (including a hollow cylindrical shape and a solid cylindrical shape). The slide core 150 extends in the second direction D2. The slide core 150 is inserted into the middle portion 110 of the hollow pipe 100 (inside the spiral portion).

[0024] As shown in FIG. 1, the mold 20 has a molding space 60 (see also FIG. 10) in which a hollow pipe 100 can be placed. The molding space 60 is a space in which a molten metal material (molten metal) is poured. The molding space 60 is a space in which a casting 140 is molded. When the movable die 40, the core 50, and the sliding core 150 are brought close to the fixed die 30 and the mold 20 is closed, the molding space 60 (see also FIG. 10) is formed by the movable die 40, the fixed die 30, the core 50, and the sliding core 150. The molding space 60 is defined by the fixed die 30, the movable die 40, the core 50, and the sliding core 150. When the mold body 25 does not have the core 50 and the sliding core 150, the molding space 60 is defined by the fixed die 30 and the movable die 40.

[0025] The mold 20 has a holding portion 42 (see FIG. 4) that holds both ends (i.e., the first end 102 and the second end 106) of the hollow pipe 100. As shown in FIG. 5, the movable mold 40 has a first holding portion 42A (see also FIG. 4) that holds the first end 102 of the hollow pipe 100, and a second holding portion 42B (see also FIG. 4) that holds the second end 106 of the hollow pipe 100. The first holding portion 42A and the second holding portion 42B are through holes formed in the movable mold 40. The first holding portion 42A and the second holding portion 42B communicate with the inner surface 40A and the outer surface 40B (see FIG. 1) of the movable mold 40. When the hollow pipe 100 is disposed in the molding space 60 (i.e., when the hollow pipe 100 is attached to the movable mold 40), the first end 102 is inserted into the first holding portion 42A, and the second end 106 is inserted into the second holding portion 42B. In this way, the hollow pipe 100 is held by the movable mold 40. When the first end 102 is inserted into the first holding portion 42A, the injection port 103 is exposed to the outside of the movable mold 40 (see FIG. 1). When the second end 106 is inserted into the second holding portion 42B, the discharge port 107 is exposed to the outside of the movable mold 40 (see FIG. 1). As shown in FIG. 10, the first holding portion 42A and the second holding portion 42B are provided in the movable mold 40 in this embodiment, but may be provided in the fixed mold 30. Furthermore, when the hollow pipe 100 is positioned in the molding space 60 (i.e., when the hollow pipe is attached to the movable mold 40), the middle portion 110 of the hollow pipe 100 does not come into contact with the inner surface 40A of the movable mold 40, the inner surface 30A of the fixed mold 30, and the inner surface 50A of the core 50.

[0026] The mold 20 includes a plurality of protruding members 70 that suppress the hollow pipe 100 from moving in the molding space 60 when the molten metal material is injected into the molding space 60. The protruding members 70 are configured to suppress the movement of the middle portion 110 of the hollow pipe 100 in the second direction D2. The protruding members 70 are configured to suppress the movement (e.g., radially outward movement) of the middle portion 110 of the hollow pipe 100 in a direction intersecting the second direction D2 (e.g., a direction perpendicular to the second direction D2. For example, the radial direction of the middle portion 110). The protruding members 70 protrude from the inner surface of the mold body 25 toward the molding space 60. The protruding members 70 are an example of a suppressing member. As shown in FIG. 10, the protruding members 70 include a fixed mold side protruding member 71 provided on the fixed mold 30, a movable mold side protruding member 72 provided on the movable mold 40, and a core side protruding member 73 provided on the core 50.

[0027] As shown in FIG. 4, the movable mold side protruding member 72 is provided on the movable mold 40. The movable mold side protruding member 72 is formed integrally with the movable mold 40. The movable mold side protruding member 72 may be formed separately from the movable mold 40. That is, the movable mold side protruding member 72 may be provided detachably on the mold body 25 (here, the movable mold 40). The movable mold side protruding member 72 protrudes from the inner surface 40A of the movable mold 40 toward the molding space 60. The movable mold side protruding member 72 protrudes from the inner surface 40A of the movable mold 40 toward the fixed mold 30. The movable mold side protruding member 72 extends in the first direction D1. The movable mold side protruding member 72 is located below the first holding portion 42A and the second holding portion 42B. The movable mold side protruding member 72 may be located above the first holding portion 42A and the second holding portion 42B. The movable mold side protruding members 72 are arranged in a straight line in the second direction D2. The pitch of adjacent movable mold side protruding members 72 in the second direction D2 is the same as the pitch of adjacent bent portions 112 of the hollow pipe 100 in the second direction D2. As shown in FIG. 5, the multiple movable mold side protruding members 72 are provided so as to be positioned between adjacent locked portions 113 when the hollow pipe 100 is placed in the molding space 60 (i.e., when the hollow pipe 100 is attached to the movable mold 40). The movable mold side protruding members 72 are provided so as to be able to come into contact with the hollow pipe 100 (more specifically, the locked portion 113). In this embodiment, five movable mold side protruding members 72 are provided in the movable mold 40, but the number of movable mold side protruding members 72 is not limited to five. The multiple movable mold side protruding members 72 have the same protruding amounts (lengths in the first direction D1) from the inner surface 40A of the movable mold 40. The amount of protrusion of the multiple movable mold side protruding members 72 from the inner surface 40A of the movable mold 40 may be different from each other. For example, the amount of protrusion of some of the multiple movable mold side protruding members 72 from the inner surface 40A of the movable mold 40 may be different from the amount of protrusion of other of the multiple movable mold side protruding members 72 from the inner surface 40A of the movable mold 40. As shown in Fig. 4, the movable mold side protruding member 72 has a cylindrical main body portion 72A extending from the inner surface 40A of the movable mold 40 in the first direction D1, and a tapered portion 72B extending from the tip of the main body portion 72A in the first direction D1 and having a diameter that becomes smaller toward the tip.That is, the tapered portion 72B is formed so as to decrease in diameter toward the tip. The movable mold side protruding member 72 may have only the main body portion 72A, or may have only the tapered portion 72B. The distance between the tip sides of adjacent movable mold side protruding members 72 is wider than the distance between the base dies. The distance between the tip sides of adjacent movable mold side protruding members 72 may be the same as the distance between the base dies.

[0028] As shown in FIG. 6, the fixed mold side protruding member 71 is provided on the fixed mold 30. The fixed mold side protruding member 71 is formed integrally with the fixed mold 30. The fixed mold side protruding member 71 may be formed separately from the fixed mold 30. That is, the fixed mold side protruding member 71 may be provided detachably on the mold body 25 (here, the fixed mold 30). The fixed mold side protruding member 71 protrudes from the inner surface 30A of the fixed mold 30 toward the molding space 60. The inner surface 30A faces the inner surface 40A of the movable mold 40. The fixed mold side protruding member 71 protrudes from the inner surface 30A of the fixed mold 30 toward the movable mold 40. The fixed mold side protruding member 71 extends in the first direction D1. The fixed mold side protruding member 71 is aligned in a straight line in the second direction D2. The pitch of adjacent fixed mold side protruding members 71 in the second direction D2 is the same as the pitch of adjacent bent portions 112 of the hollow pipe 100 in the second direction D2. The multiple fixed mold side protruding members 71 are provided so as to be positioned between adjacent locked portions 113 when the hollow pipe 100 is placed in the molding space 60 (i.e., when the mold 20 is closed). The fixed mold side protruding members 71 are provided so as to be able to come into contact with the hollow pipe 100 (more specifically, the locked portions 113). In this embodiment, five fixed mold side protruding members 71 are provided in the fixed mold 30, but the number of fixed mold side protruding members 71 is not limited to five. The multiple fixed mold side protruding members 71 have the same protruding amounts (lengths in the first direction D1) from the inner surface 30A of the fixed mold 30. The multiple fixed mold side protruding members 71 may have different protruding amounts from the inner surface 30A of the fixed mold 30. For example, the amount of protrusion of some of the multiple fixed mold side protruding members 71 from the inner surface 30A of the fixed mold 30 may be different from the amount of protrusion of other of the multiple fixed mold side protruding members 71 from the inner surface 30A of the fixed mold 30. The fixed mold side protruding member 71 has a cylindrical main body portion 71A extending from the inner surface 30A of the fixed mold 30 in the first direction D1, and a tapered portion 71B extending from the tip of the main body portion 71A in the first direction D1 and having a smaller diameter toward the tip. That is, the tapered portion 71B is formed so as to decrease in diameter toward the tip. The fixed mold side protruding member 71 may have only the main body portion 71A or only the tapered portion 71B.The distance between the tip ends of adjacent fixed mold side protruding members 71 is wider than the distance between the base dies. Note that the distance between the tip ends of adjacent fixed mold side protruding members 71 and the distance between the base dies may be the same.

[0029] As shown in FIG. 7, the core side protruding member 73 is provided on the core 50. The core side protruding member 73 is formed integrally with the core 50. The core side protruding member 73 may be formed separately from the core 50. That is, the core side protruding member 73 may be provided detachably on the mold main body 25 (core 50 in this case). The core side protruding member 73 protrudes from the inner surface 50A of the core 50 toward the molding space 60. The inner surface 50A is perpendicular to the inner surface 40A of the movable mold 40 and the inner surface 30A of the fixed mold 30. The core side protruding member 73 protrudes downward from the inner surface 50A of the core 50. The core side protruding member 73 extends in the third direction D3. The core side protruding member 73 is aligned in a straight line in the second direction D2. The pitch of adjacent core side protruding members 73 in the second direction D2 is the same as the pitch of adjacent bent portions 112 of the hollow pipe 100 in the second direction D2. The multiple core side protruding members 73 are provided so as to be positioned between adjacent locked portions 113 when the hollow pipe 100 is placed in the molding space 60 (i.e., when the mold 20 is closed). The core side protruding members 73 are provided so as to be able to come into contact with the hollow pipe 100 (more specifically, the locked portions 113) when the hollow pipe 100 is placed in the molding space 60 (i.e., when the mold 20 is closed). In this embodiment, six core side protruding members 73 are provided in the core 50, but the number of core side protruding members 73 is not limited to six. The multiple core side protruding members 73 have the same protruding amounts (lengths in the third direction D3) from the inner surface 50A of the core 50. The core-side protruding members 73 may protrude from the inner surface 50A of the core 50 by different amounts. For example, the protruding amount of some of the core-side protruding members 73 from the inner surface 50A of the core 50 may be different from the protruding amount of other of the core-side protruding members 73 from the inner surface 50A of the core 50. The core-side protruding members 73 have a cylindrical main body portion 73A extending from the inner surface 50A of the core 50 in the third direction D3, and a tapered portion 73B extending from the tip of the main body portion 73A in the third direction D3 and having a smaller diameter toward the tip. That is, the tapered portion 73B is formed so as to decrease in diameter toward the tip. The core-side protruding members 73 may have only the main body portion 73A or only the tapered portion 73B.The distance between the tip ends of adjacent core-side protruding members 73 is wider than the distance between the root dies. Note that the distance between the tip ends of adjacent core-side protruding members 73 and the distance between the root dies may be the same.

[0030] As shown in FIG. 1, the mold 20 has a plurality of protrusions 152 that suppress the hollow pipe 100 from moving in the molding space 60 when a molten metal material is injected into the molding space 60. The protrusions 152 are configured to suppress the middle part 110 of the hollow pipe 100 from moving (e.g., moving radially inward) in a direction intersecting the second direction D2 (e.g., a direction perpendicular to the second direction D2; e.g., a radial direction of the middle part 110). The protrusions 152 are provided so as to be able to come into contact with the middle part 110. In the process of inserting the slide core 150 into the inside of the middle part 110 of the hollow pipe 100, a gap is formed between the outer diameter end of the protrusions 152 and the inner peripheral surface of the middle part 110 to an extent that allows the slide core 150 to be inserted. Then, when the insertion of the slide core 150 into the middle portion 110 is completed, the outer diameter end of the protruding portion 152 and the inner peripheral surface of the middle portion 110 are in contact with each other. When the insertion of the slide core 150 into the middle portion 110 is completed, the outer diameter end of the protruding portion 152 and the inner peripheral surface of the middle portion 110 may not be in contact with each other. That is, when the insertion of the slide core 150 into the middle portion 110 is completed, a small gap may be formed between the outer diameter end of the protruding portion 152 and the inner peripheral surface of the middle portion 110. It is preferable that this gap is set so that when the middle portion 110 moves in the radial direction, the outer diameter end of the protruding portion 152 comes into contact with the inner peripheral surface of the middle portion 110 to suppress the movement inward in the radial direction. As shown in FIG. 9, the protruding portion 152 is formed on the outer peripheral surface 150S of the slide core 150. The protruding portion 152 extends in the second direction D2. The protruding portions 152 are formed to be spaced apart from each other in the circumferential direction of the outer peripheral surface 150S. The protruding portions 152 are provided at equal intervals in the circumferential direction of the outer peripheral surface 150S. Here, the slide core 150 has three protruding portions 152, but the number of protruding portions 152 is not limited to three. As shown in Figs. 8 and 10, the protruding portions 152 protrude toward the middle portion 110. The protruding portions 152 are an example of a suppressing member.

[0031] As shown in Fig. 10, when the hollow pipe 100 is placed in the molding space 60, the movable mold side protruding member 72, the fixed mold side protruding member 71, and the core side protruding member 73 are located between the adjacent locked portions 113 of the hollow pipe 100, and therefore movement of the hollow pipe 100 (particularly, movement of the middle portion 110 in the radial outward direction and in the second direction D2) can be suppressed. Furthermore, when the hollow pipe 100 is placed in the molding space 60, the protruding portion 152 is located radially inward from the middle portion 110, and therefore movement of the middle portion 110 in the radial inward direction can be suppressed. When the hollow pipe 100 is placed in the molding space 60, the movable mold side protruding member 72, the fixed mold side protruding member 71, the core side protruding member 73, and the protruding portion 152 can hold the middle portion 110 of the hollow pipe 100 in a predetermined position. In this embodiment, the core side protruding member 73 is located above the center of the middle portion 110 of the hollow pipe 100 in the third direction D3 and in the center portion of the middle portion 110 in the first direction D1. The movable mold side protruding member 72 is located below the center of the middle portion 110 of the hollow pipe 100 in the third direction D3 and closer to the first end portion 102 than the center of the middle portion 110 in the first direction D1. The fixed mold side protruding member 71 is located below the center of the middle portion 110 of the hollow pipe 100 in the third direction D3 and on the opposite side to the first end portion 102 than the center of the middle portion 110 in the first direction D1. Furthermore, when viewed from the center line 110C of the midway portion 110, the tips of the movable mold side protruding member 72, the fixed mold side protruding member 71, and the core side protruding member 73 are located closer to the center line 110C of the midway portion 110 than the center line 100C along the spiral direction of the hollow pipe 100. Therefore, the protruding member 70 can reliably suppress the hollow pipe 100 from moving within the molding space 60, and can more reliably keep the hollow pipe 100 at a predetermined position in the molding space 60. Furthermore, when viewed from the center line 110C of the midway portion 110, at least a part of the tips of the movable mold side protruding member 72 and the fixed mold side protruding member 71 are located closer to the center line 110C of the midway portion 110 than the inner diameter side periphery 100I of the hollow pipe 100. Therefore, the protruding member 70 can more reliably prevent the hollow pipe 100 from moving within the molding space 60, and can more reliably hold the hollow pipe 100 at a predetermined position in the molding space 60.It is not necessary that all of the tips of the movable mold side protruding member 72, the fixed mold side protruding member 71, and the core side protruding member 73 have the above-mentioned relationship, but at least some of them may have the above-mentioned relationship. Furthermore, when the slide core 150 is inserted into the midway portion 110, at least a part of the protruding portion 152 is provided so as to face the second discharge port 62 and the third discharge port 63. Here, for example, the protruding portion 152A is provided so as to face the second discharge port 62 and the third discharge port 63. When the slide core 150 is inserted into the midway portion 110, the protruding portion 152 is located between the protruding members 70 and 70 in the circumferential direction of the midway portion 110 when viewed from the second direction D2. Here, for example, the protruding portion 152A is located between the fixed mold side protruding member 71 and the movable mold side protruding member 72 in the circumferential direction of the midway portion 110. The fixed mold side protruding member 71 is an example of a first protruding member, and the movable mold side protruding member 72 is an example of a second protruding member. Note that, when the slide core 150 is inserted into the mid-way portion 110, the protruding portion 152 and the mid-way portion 110 may come into contact with each other, but the outer circumferential surface 150S of the slide core 150 and the mid-way portion 110 do not come into contact with each other.

[0032] The mold 20 is provided with an injection port 65 (see FIG. 4 and FIG. 6) through which a molten metal material can be injected into the molding space 60. The injection port 65 is formed by the movable mold 40 and the fixed mold 30 when the movable mold 40 is brought close to the fixed mold 30 and the mold 20 is closed. That is, the injection port 65 is located at the boundary between the movable mold 40 and the fixed mold 30. The injection port 65 is partitioned by a movable mold side injection port 65A (see FIG. 4) formed in the movable mold 40 and a fixed mold side injection port 65B (see FIG. 6) formed in the fixed mold 30. The movable mold side injection port 65A is formed in the contact surface 40C of the movable mold 40 that comes into surface contact with the contact surface 30C of the fixed mold 30. The fixed mold side injection port 65B is formed in the contact surface 30C of the fixed mold 30 that comes into surface contact with the contact surface 40C of the movable mold 40. The injection port 65 opens downward.

[0033] The mold 20 has a flow path 68 (see FIG. 4 and FIG. 6) that communicates the injection port 65 and the molding space 60. The flow path 68 is formed by the movable mold 40 and the fixed mold 30 when the mold 20 is closed by bringing the movable mold 40 close to the fixed mold 30. That is, the flow path 68 is located at the boundary between the movable mold 40 and the fixed mold 30. The flow path 68 is partitioned by a movable mold side flow path 68A (see FIG. 4) formed in the movable mold 40 and a fixed mold side flow path 68B (see FIG. 6) formed in the fixed mold 30. As shown in FIG. 4, the flow path 68 includes a first outlet 61, a second outlet 62, and a third outlet 63 that discharge the molten metal material toward the molding space 60. The first outlet 61, the second outlet 62, and the third outlet 63 communicate with the injection port 65. The first outlet 61 is located above the movable mold side protruding member 72. The second discharge port 62 and the third discharge port 63 are located below the movable mold side protruding member 72. The first discharge port 61 is defined by a movable mold side first discharge port 61A (see FIG. 4) formed in the movable mold 40 and a fixed mold side first discharge port 61B (see FIG. 6) formed in the fixed mold 30. The second discharge port 62 is defined by a movable mold side second discharge port 62A (see FIG. 4) formed in the movable mold 40 and a fixed mold side second discharge port 62B (see FIG. 6) formed in the fixed mold 30. The third discharge port 63 is defined by a movable mold side third discharge port 63A (see FIG. 4) formed in the movable mold 40 and a fixed mold side third discharge port 63B (see FIG. 6) formed in the fixed mold 30. The movable mold side flow path 68A, the movable mold side first outlet 61A, the movable mold side second outlet 62A, and the movable mold side third outlet 63A are formed on the contact surface 40C of the movable mold 40. The fixed mold side flow path 68B, the fixed mold side first outlet 61B, the fixed mold side second outlet 62B, and the fixed mold side third outlet 63B are formed on the contact surface 30C of the fixed mold 30.

[0034] As shown in FIG. 1, the filling material conveying device 80 is a device separate from the mold 20. The filling material conveying device 80 is a device that injects a non-compressible fluid into the inlet 103 of the hollow pipe 100. The filling material conveying device 80 is a device that discharges and recovers the non-compressible fluid from the outlet 107 of the hollow pipe 100. The non-compressible fluid is not particularly limited as long as it is filled inside the hollow pipe 100 and suppresses deformation of the hollow pipe 100 even when a load is applied to the hollow pipe 100. The non-compressible fluid is, for example, oil (e.g., hydraulic oil). The filling material conveying device 80 is attached to the inlet 103 and the outlet 107 of the hollow pipe 100 arranged in the molding space 60 (see FIG. 1) of the mold 20. The filling material conveying device 80 includes a conveying section 82 that sends out the non-compressible fluid and a recovery section 84 that recovers the non-compressible fluid. The conveying unit 82 and the collecting unit 84 are, for example, hoses having pressure resistance and heat resistance. The conveying unit 82 is attached to the first end 102 of the hollow pipe 100. The conveying unit 82 communicates with the inlet 103 of the first end 102. The collecting unit 84 is attached to the second end 106 of the hollow pipe 100. The collecting unit 84 communicates with the outlet 107 of the second end 106. The method of attaching the conveying unit 82 to the first end 102 and the method of attaching the collecting unit 84 to the second end 106 are not particularly limited. For example, they may be detachable by a coupler (one-touch joint) or the like. The filling conveying device 80 may fill the hollow pipe 100 with a solid material such as sand instead of the incompressible fluid.

[0035] 1, the metal material transport device 90 is a device separate from the mold 20. The metal material transport device 90 is a device that injects a molten metal material (molten metal) into the molding space 60 from the injection port 65 of the mold 20. The metal material transport device 90 is, for example, an injection device that can apply a predetermined pressure to the molten metal and can inject the molten metal at a predetermined injection speed.

[0036] Next, a method for manufacturing the casting 140 will be described. Fig. 11 is a flow chart showing a method for manufacturing the casting 140 (hereinafter simply referred to as the manufacturing method). As shown in Fig. 11, the manufacturing method includes a preparation step (step S10), a placement step (step S20), a mold clamping step (step S30), a fluid filling step (step S40), a filling step (step S50), a discharge step (step S60), and a removal step (step S70). Here, as shown in Fig. 1, the casting 140 (see Fig. 3A) is manufactured using a casting manufacturing apparatus 10 including a mold 20, a filling material conveying device 80, and a metal material conveying device 90.

[0037] First, in a preparation step (step S10), a mold 20 is prepared as shown in Fig. 1. More specifically, the mold 20 is prepared, including a fixed mold 30, a movable mold 40 that can approach or move away from the fixed mold 30, a core 50, a sliding core 150, a molding space 60 that is partitioned by the fixed mold 30, the movable mold 40, the core 50, and the sliding core 150 and in which the hollow pipe 100 can be placed, an injection port 65 that can inject molten metal material into the molding space 60, a first holding portion 42A and a second holding portion 42B that respectively hold a first end 102 and a second end 106 of the hollow pipe 100, and a protruding member 70 that suppresses movement of the hollow pipe 100 within the molding space 60 when the molten metal material is injected into the molding space 60.

[0038] Next, in the arrangement step (step S20), the hollow pipe 100 is arranged in the molding space 60. More specifically, the first end 102 of the hollow pipe 100 is held by the first holding portion 42A of the movable mold 40 and the second end 106 is held by the second holding portion 42B of the movable mold 40 so that the hollow pipe 100 contacts the protruding member 70 (here, so that the locked portion 113 of the hollow pipe 100 contacts the movable mold side protruding member 72), and the hollow pipe 100 is attached to the movable mold 40.

[0039] Next, in the mold clamping step (step S30), the movable mold 40, the core 50, and the slide core 150 are brought close to the fixed mold 30 to close the mold 20. As a result, a molding space 60 in which the casting 140 is molded is defined by the cavity portion 31 of the fixed mold 30 and the core portion 41 of the movable mold 40, the core 50, and the slide core 150. When the mold 20 is in a closed state, the middle portion 110 of the hollow pipe 100 is in contact with the movable mold side protruding member 72, the fixed mold side protruding member 71, and the core side protruding member 73, so that the movement of the middle portion 110 is suppressed by the movable mold side protruding member 72, the fixed mold side protruding member 71, and the core side protruding member 73. In addition, since the slide core 150 is inserted into the middle portion 110, the protruding portion 152 of the slide core 150 suppresses the radial inward movement of the middle portion 110.

[0040] Next, in the fluid filling step (step S40), an incompressible fluid (e.g., oil) is injected from the inlet 103 of the first end 102 to fill the hollow pipe 100 with the incompressible fluid. More specifically, the conveying section 82 of the filling material conveying device 80 is attached to the first end 102 of the hollow pipe 100 by a one-touch joint or the like, and the recovery section 84 of the filling material conveying device 80 is attached to the second end 106 of the hollow pipe 100 by a one-touch joint or the like. Then, the incompressible fluid is filled into the hollow pipe 100 from the filling material conveying device 80 through the inlet 103. After the filling of the incompressible fluid into the hollow pipe 100 is completed, the filling material conveying device 80 may be removed from the hollow pipe 100 or may remain attached. In this embodiment, the fluid filling step (step S40) is performed after the mold clamping step (step S30), but the mold clamping step (step S30) may be performed after the fluid filling step (step S40).

[0041] Next, in the filling step (step S50), a molten metal material is injected from the injection port 65 of the mold 20 into the molding space 60 formed by the movable mold 40, the fixed mold 30, the core 50, and the sliding core 150, to fill the molding space 60 with the molten metal material. An example of the metal material is an aluminum alloy. Then, the molten metal material (molten metal) in the mold 20 is cooled and solidified. Here, cooling in this specification refers to cooling for solidifying the molten metal.

[0042] Next, in the discharge step (step S60), the incompressible fluid filled in the hollow pipe 100 is discharged from the discharge port 107 of the second end 106 of the casting 140. More specifically, the filling material conveying device 80 is driven to discharge the incompressible fluid from the discharge port 107 of the second end 106 of the hollow pipe 100 toward the filling material conveying device 80. The incompressible fluid discharged from the discharge port 107 is collected in the filling material conveying device 80. Then, after the incompressible fluid is discharged from the hollow pipe 100, the filling material conveying device 80 is removed from the hollow pipe 100. The discharge step (step S60) is performed in a state where the casting 140 is disposed in the mold 20. The discharge step (step S60) may be performed after the molten metal in the mold 20 has completely solidified, or may be performed while the molten metal is solidifying. That is, the discharge of the non-compressible fluid may start after the curing time (the time required for cooling to solidify the molten metal) has elapsed, or the discharge of the non-compressible fluid may start before the curing time has elapsed.

[0043] Next, in the removal step (step S70), the movable die 40, the core 50, and the sliding core 150 are separated from the fixed die 30 to open the metal mold 20. At this time, the molded casting 140 is fixed to the movable die 40. Then, a core pin (not shown) is pressed against the casting 140 fixed to the movable die 40, and the casting 140 from which the incompressible fluid has been discharged from the hollow pipe 100 is removed from the movable die 40. In this manner, the casting 140 including the hollow pipe 100 and the metal material 120 surrounding the hollow pipe 100 is molded.

[0044] As described above, the mold 20 of this embodiment includes the protruding member 70 that prevents the hollow pipe 100 from moving within the molding space 60 when molten metal material is injected into the molding space 60. According to the above aspect, the protruding member 70 can keep the hollow pipe 100 at a predetermined position in the molding space 60, so that a casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0045] In the mold 20 of this embodiment, the protruding member 70 may be formed integrally with the mold body 25. According to the above-described aspect, the protruding member 70 does not shift relative to the mold body 25, so that the casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0046] In the mold 20 of this embodiment, the protruding member 70 protrudes from the inner surface of the mold body 25 toward the molding space 60. According to the above-described aspect, by bringing the protruding member 70 into contact with the hollow pipe 100, the movement of the hollow pipe 100 can be easily suppressed.

[0047] In the mold 20 of this embodiment, the multiple protruding members 70 may be provided so as to be positioned between adjacent locked portions 113 when the hollow pipe 100 is placed in the molding space 60. According to the above aspect, the locked portions 113 are more reliably prevented from moving in a predetermined direction (here, the second direction D2), so that a casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0048] In the mold 20 of this embodiment, the multiple protruding members 70 may have the same protruding amounts from the inner surface of the mold body 25 (for example, the inner surface 40A of the movable mold 40). According to the above aspect, the protruding members 70 can be easily formed.

[0049] In the mold 20 of this embodiment, the amount of protrusion of some of the multiple protruding members 70 from the inner surface of the mold body 25 (for example, the inner surface 40A of the movable mold 40) may be different from the amount of protrusion of other of the multiple protruding members 70 from the inner surface of the mold body 25 (for example, the inner surface 40A of the movable mold 40). According to the above aspect, various protruding members 70 can be used in accordance with the shape of the hollow pipe 100.

[0050] In the mold 20 of this embodiment, the distance between the tip ends of adjacent protruding members 70 may be wider than the distance between the base dies. According to the above aspect, when the hollow pipe 100 is placed in the molding space 60, the locked portion 113 of the hollow pipe 100 can be easily placed between the adjacent protruding members 70.

[0051] In the mold 20 of this embodiment, some of the multiple protruding members 70 may be provided on a first inner surface (e.g., the inner surface 30A of the fixed mold 30), and other parts of the multiple protruding members 70 may be provided on a second inner surface (e.g., the inner surface 40A of the movable mold 40). According to the above aspect, even if the flow of the molten metal material injected into the molding space 60 becomes complicated, the movement of the hollow pipe 100 is restrained from different angles by the protruding members 70, so that the movement of the hollow pipe 100 can be more reliably restrained.

[0052] In the mold 20 of this embodiment, some of the multiple protruding members 70 may be provided on the inner surface 30A of the fixed mold 30, and other parts of the multiple protruding members 70 may be provided on the inner surface 40A of the movable mold 40. According to the above aspect, for example, by simply attaching the hollow pipe 100 to the movable mold 40, the movement of the hollow pipe 100 can be suppressed by the protruding members 70 of the movable mold 40 and the fixed mold 30.

[0053] In the mold 20 of this embodiment, some of the multiple protruding members 70 may be provided on the inner surface 50A of the core 50. According to the above aspect, for example, by simply attaching the hollow pipe 100 to the movable mold 40, the protruding members 70 of the movable mold 40, the fixed mold 30, and the core 50 can more reliably suppress movement of the hollow pipe 100.

[0054] In the mold 20 of this embodiment, the protruding member 70 may be provided detachably on the mold body 25. According to the above aspect, the shape of the protruding member 70 can be easily changed according to the shape of the hollow pipe 100. In addition, since the protruding member 70 is a separate member from the mold body 25, the mold body 25 can be easily formed. Furthermore, if the protruding member 70 is damaged, it can be easily replaced.

[0055] In the mold 20 of this embodiment, the protruding member 70 is configured to suppress movement of the middle portion 110 of the hollow pipe 100 in the second direction D2. According to the above aspect, the position of the middle portion 110 of the hollow pipe 100 can be maintained in the second direction D2, so that the casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0056] In the mold 20 of this embodiment, the midway portion 110 is formed in a spiral shape extending in the second direction D2. According to the above aspect, the midway portion 110 formed in a spiral shape is likely to move in the second direction D2 when the molten metal material flows into the molding space 60, but the movement of the midway portion 110 in the second direction D2 is suppressed by the protruding member 70, so that the casting 140 in which the hollow pipe 100 is precisely positioned at a predetermined position can be manufactured.

[0057] In the mold 20 of this embodiment, the protruding member 70 protrudes from the inner surface of the mold body 25 toward the hollow pipe 100, and at least the tip portion (e.g., the tapered portion 71B) of the protruding member 70 is formed so as to taper in diameter toward the tip. According to the above aspect, the position of the middle portion 110 of the hollow pipe 100 can be more reliably maintained, so that the casting 140 in which the hollow pipe 100 is positioned at a predetermined position with high accuracy can be manufactured. In addition, it becomes easier to position the middle portion 110 of the hollow pipe 100 between the protruding members 70 aligned in the second direction D2, and the workability of attaching the hollow pipe 100 to the mold 20 is improved.

[0058] In the mold 20 of this embodiment, the protruding member 70 and the protruding portion 152 are configured to suppress movement of the midway portion 110 in a direction intersecting the second direction D2. According to the above aspect, the position of the midway portion 110 of the hollow pipe 100 can be maintained in the radial direction, so that the casting 140 in which the hollow pipe 100 is precisely positioned at a predetermined position can be manufactured. In addition, the protruding member 70 and the protruding portion 152 are configured to suppress movement of the midway portion 110 in a direction perpendicular to the second direction D2.

[0059] In the die 20 of this embodiment, the protrusion 152 is formed on the outer peripheral surface 150S of the slide core 150 and protrudes toward the middle portion 110. According to the above aspect, even if the middle portion 110 of the hollow pipe 100 tries to move radially inward, the position of the middle portion 110 in the radial direction can be maintained by the protrusion 152 protruding toward the middle portion 110, so that the casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0060] In the mold 20 of this embodiment, the protruding portion 152 extends in the second direction D2. According to the above aspect, the position of the middle portion 110 can be maintained over a wider range in the second direction D2, so that the casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0061] In the mold 20 of this embodiment, when the slide core 150 is inserted into the midway portion 110, at least a part of the protruding portion 152 is provided to face the second outlet 62 and the third outlet 63. According to the above aspect, the midway portion 110 is likely to move radially due to the force of the molten metal material flowing into the molding space 60 through the second outlet 62 and the third outlet 63, but the protruding portion 152 suppresses the midway portion 110 from moving radially, so that the casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0062] In the die 20 of this embodiment, the slide core 150 is formed in a cylindrical shape, and a plurality of protrusions 152 spaced apart from one another in the circumferential direction of the slide core 150 are formed on the outer circumferential surface 150S of the slide core 150. According to the above aspect, the position of the midway portion 110 can be maintained over a wider range in the circumferential direction, so that a casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0063] In the mold 20 of this embodiment, when viewed from the second direction D2, with the slide core 150 inserted into the mid-way portion 110, the protruding portion 152A is located between the fixed-mold-side protruding member 71 and the movable-mold-side protruding member 72 in the circumferential direction of the mid-way portion 110. According to the above aspect, the protruding portion 152A, the fixed-mold-side protruding member 71, and the movable-mold-side protruding member 72 can maintain the position of the mid-way portion 110 over a wider range in the circumferential direction, so that a casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0064] According to the manufacturing method of this embodiment, in the arranging step (step S20), the hollow pipe 100 is held by the holding part 42 so that the hollow pipe 100 contacts the protruding member 70, and the hollow pipe 100 is arranged in the molding space 60. According to the above aspect, when the molten metal material is injected into the molding space 60 from the injection port 65 in the filling step (step S50) to fill the molding space 60 with the molten metal material, the protruding member 70 prevents the hollow pipe 100 from moving in the molding space 60, so that the hollow pipe 100 can be kept at a predetermined position in the molding space 60, and a casting 140 can be manufactured in which the hollow pipe 100 is precisely arranged at a predetermined position.

[0065] The manufacturing method of this embodiment may further include a fluid filling step (step S40) of injecting an incompressible fluid from the first end 102 of the hollow pipe 100 prior to the filling step (step S50) to fill the hollow pipe 100 with the incompressible fluid. According to the above aspect, the incompressible fluid is filled into the hollow pipe 100 in a state in which the hollow pipe 100 is placed in the molding space 60. Therefore, when the hollow pipe 100 is placed in the molding space 60, there is no risk of the incompressible fluid splashing or leaking out into the molding space 60.

[0066] The manufacturing method of this embodiment may further include a discharge step (step S60) of discharging the incompressible fluid filled in the hollow pipe 100 prior to the removal step (step S70). According to the above aspect, when the casting 140 is removed from the die 20, the incompressible fluid has been discharged from the hollow pipe 100. Therefore, there is no risk of the incompressible fluid splashing out when the casting 140 is removed from the die 20.

[0067] In the casting 140 of this embodiment, the metal material 120 has an inner circumferential surface 122 located radially inward from the middle portion 110 when viewed from the second direction D2, and a recess 124 recessed radially outward from the inner circumferential surface 122. According to the above aspect, the surface area of ​​the inner circumferential surface 122 of the metal material 120 is increased, thereby improving the cooling performance.

[0068] In the casting 140 of this embodiment, the recesses 124 extend in the second direction D2. According to the above-described embodiment, the surface area of ​​the inner circumferential surface 122 of the metal material 120 is increased, and therefore the cooling performance is improved.

[0069] In the casting 140 of this embodiment, the recess 124 opens in the second direction D2 at one end in the second direction D2 of the inner circumferential surface 122. According to the above aspect, the surface area of ​​the inner circumferential surface 122 of the metal material 120 is increased, thereby improving the cooling performance.

[0070] In the casting 140 of this embodiment, the recess 124 may be open in the second direction D2 at the other end in the second direction D2 of the inner circumferential surface 122. According to the above aspect, the surface area of ​​the inner circumferential surface 122 of the metal material 120 is increased, thereby improving the cooling performance.

[0071] FIG. 12 is a perspective view of a slide core 170 according to a modified example. As shown in FIG. 12, the slide core 170 has four protruding parts 152. The four protruding parts 152 are provided at equal intervals in the circumferential direction of the outer circumferential surface 150S. The slide core 170 has the same configuration as the slide core 150 except that it has four protruding parts 152. As shown in FIG. 13, when the slide core 170 is inserted into the middle part 110 and viewed from the second direction D2, the protruding parts 152 are provided at a position facing the protruding member 70. Here, for example, the protruding part 152B is provided at a position facing at least a part of the core-side protruding member 73. When the casting 140 is manufactured using the slide core 170, the metal material 120 has four recesses 124.

[0072] In the mold 20 of this embodiment, when viewed from the second direction D2 with the slide core 170 inserted into the midway portion 110, the protruding portion 152B is provided in a position facing at least a part of the core-side protruding member 73. According to the above aspect, the position of the midway portion 110 can be maintained over a wider range in the circumferential direction by the protruding portion 152B and the core-side protruding member 73, so that the casting 140 can be manufactured in which the hollow pipe 100 is precisely positioned at a predetermined position.

[0073] FIG. 14 is a perspective view of a casting 180 according to a modified example. As shown in FIG. 14, the metal material 120 has a plurality of recesses 184 recessed from the inner peripheral surface 122 toward the outside in the radial direction. The plurality of recesses 184 are aligned in the second direction D2. The recesses 184 are formed in a circular shape when viewed in the radial direction. The shape of the recesses 184 is not limited to a circular shape, and may be a rectangular shape, an elliptical shape, or the like. The recesses 184 are formed so as to expand in diameter from the outside in the radial direction toward the inside in the radial direction. A part of the middle portion 110 may be exposed to the outside at the recesses 184. The metal material 120 also has a plurality of other recesses 194 recessed from the outer peripheral surface 123 toward the inside in the radial direction. The plurality of other recesses 194 are aligned in the second direction D2. The other recesses 194 are formed in a circular shape when viewed in the radial direction. The shape of the other recesses 194 is not limited to a circular shape, and may be a rectangular shape, an elliptical shape, or the like. The other recess 194 is formed so as to increase in diameter from the radially inner side toward the radially outer side. A part of the midway portion 110 may be exposed to the outside in the other recess 194.

[0074] In the casting 180 of this embodiment, the metal material 120 has a plurality of recesses 184 aligned in the second direction D2. According to the above-described embodiment, the surface area of ​​the inner circumferential surface 122 of the metal material 120 is increased, thereby improving the cooling performance.

[0075] In the casting 180 of this embodiment, the recess 184 is formed in a circular shape when viewed in a direction along which a straight line perpendicular to the second direction D2 and passing through the center of the recess 184 extends. According to the above aspect, compared to a case in which the recess 184 is formed in a rectangular shape, for example, damage to the casting 180 can be suppressed even though the recess 184 is formed on the surface of the casting 180.

[0076] In the casting 180 of this embodiment, the recess 184 is formed so as to expand in diameter from the radially outer side toward the radially inner side. According to the above-described embodiment, the recess 184 expands in diameter toward the surface side of the metal material 120. In other words, the diameter of the recess 184 decreases toward the back, which makes it easier to inspect the state inside the recess 184 during inspection after completion, etc.

[0077] <Second embodiment> Fig. 15 is a schematic diagram of a casting manufacturing apparatus 210 according to this embodiment. The casting manufacturing apparatus 210 is an apparatus for manufacturing a casting 540 (see Fig. 16) including a hollow pipe 100 (see Fig. 2) and a metal material 120 that is cast around the hollow pipe 100. As shown in Fig. 15, the casting manufacturing apparatus 210 includes a mold 220, a filler transport device 80, and a metal material transport device 90.

[0078] As shown in FIG. 16, the casting 540 includes a hollow pipe 100 and a metal material 120 that surrounds the hollow pipe 100. The hollow pipe 100 and the metal material 120 are integrated. A part of the first end 102, a part of the second end 106, and a part of the middle portion 110 (i.e., a part of the bent portion 112) of the hollow pipe 100 are covered with the metal material 120. A part of the first end 102 including the inlet 103, a part of the second end 106 including the outlet 107, and a part of the middle portion 110 are exposed to the outside from the metal material 120. The middle portion 110 has a plurality of exposed portions 114 that are exposed to the outside from the metal material 120 and aligned in the second direction D2. The exposed portions 114 are part of the bent portion 112 (see FIG. 3A). The exposed portions 114 are part of the locked portion 113 (see FIG. 3A). Casting 540 may be used, for example, as a drive motor case, or the like.

[0079] 15, the mold 220 includes a mold body 225. The mold body 225 includes a fixed mold 230, a movable mold 240 that can approach or move away from the fixed mold 230, a core 250 at least a portion of which is located between the fixed mold 230 and the movable mold 240, and a slide core 150 at least a portion of which is located between the fixed mold 230 and the movable mold 240.

[0080] The mold 220 has a plurality of grooves 270 (see FIG. 21) that suppress the hollow pipe 100 from moving in the molding space 60 when the molten metal material is injected into the molding space 60. The grooves 270 are formed on the inner surface of the mold body 225. The grooves 270 are an example of a suppressing member. The depth of the grooves 270 is approximately the same as the radius (half the outer diameter) of the hollow pipe 100. The depth of the grooves 270 may be shallower or deeper than the radius of the hollow pipe 100 as long as the movement of the locked portion 113 arranged in the grooves 270 can be suppressed. The depths of all the grooves 270 may be the same or different. As shown in FIG. 21, the grooves 270 include a fixed mold side groove 271 provided in the fixed mold 230, a movable mold side groove 272 provided in the movable mold 240, and a core side groove 273 provided in the core 250. The depth of the fixed mold side groove 271, the depth of the movable mold side groove 272, and the depth of the core side groove 273 may be the same as each other, may be different from each other, or may be partly the same and partly different.

[0081] As shown in FIG. 17, the movable mold side groove 272 is provided in the movable mold 240. A part of the middle part 110 of the hollow pipe 100 is arranged in the movable mold side groove 272. The movable mold side groove 272 is formed so as to be able to clamp the hollow pipe 100. The movable mold side groove 272 is formed in the inner surface 40A of the movable mold 240. The movable mold side groove 272 extends in the third direction D3. The movable mold side groove 272 has a semicircular cross section. The movable mold side groove 272 is located below the first holding part 42A and the second holding part 42B. The movable mold side groove 272 has a plurality of locking grooves 272A into which the locked part 113 of the hollow pipe 100 is fitted when the hollow pipe 100 is arranged in the molding space 60. The plurality of locking grooves 272A are arranged at equal intervals in the second direction D2. The pitch of adjacent locking grooves 272A is the same as the pitch of adjacent bent portions 112 of the hollow pipe 100. The locking grooves 272A have a semicircular cross section. As shown in FIG. 18, the locking grooves 272A are provided so as to be able to come into contact with the hollow pipe 100 (more specifically, the locked portion 113). The locking grooves 272A are formed so as to be able to clamp the locked portion 113. In this embodiment, five locking grooves 272A are provided in the movable mold 240, but the number of locking grooves 272A is not limited to five. The lengths of the multiple locking grooves 272A in the third direction D3 are the same as each other. The lengths of the multiple locking grooves 272A in the third direction D3 may be different from each other. For example, the length in the third direction D3 of some of the multiple locking grooves 272A may be different from the length in the third direction D3 of other of the multiple locking grooves 272A.

[0082] As shown in FIG. 19, the fixed mold side groove 271 is provided in the fixed mold 230. A part of the middle portion 110 of the hollow pipe 100 is disposed in the fixed mold side groove 271. The fixed mold side groove 271 is formed so as to be able to clamp the hollow pipe 100. The fixed mold side groove 271 is formed in the inner surface 30A of the fixed mold 230. The fixed mold side groove 271 extends in the third direction D3. The fixed mold side groove 271 has a semicircular cross section. The fixed mold side groove 271 has a plurality of locking grooves 271A into which the locked portion 113 of the hollow pipe 100 is fitted when the hollow pipe 100 is disposed in the molding space 60. The plurality of locking grooves 271A are arranged at equal intervals in the second direction D2. The pitch of adjacent locking grooves 271A is the same as the pitch of adjacent bent portions 112 of the hollow pipe 100. The locking groove 271A has a semicircular cross section. The locking grooves 271A are provided so as to be able to come into contact with the hollow pipe 100 (more specifically, the locked portion 113). The locking grooves 271A are formed so as to be able to clamp the locked portion 113. In this embodiment, the fixed mold 230 is provided with five locking grooves 271A, but the number of locking grooves 271A is not limited to five. The lengths of the locking grooves 271A in the third direction D3 are the same as each other. The lengths of the locking grooves 271A in the third direction D3 may be different from each other. For example, the length of some of the locking grooves 271A in the third direction D3 may be different from the length of other of the locking grooves 271A in the third direction D3. When the mold 220 is closed, the locking groove 272A (see FIG. 17) of the movable mold side groove 272 is continuous with the locking groove 271A of the fixed mold side groove 271.

[0083] As shown in FIG. 20, the core side groove 273 is provided in the core 250. A part of the middle portion 110 of the hollow pipe 100 is disposed in the core side groove 273. The core side groove 273 is formed so as to be able to clamp the hollow pipe 100. The core side groove 273 is formed on the inner surface 50A of the core 250. The core side groove 273 extends in the first direction D1. The core side groove 273 has a semicircular cross section. The core side groove 273 has a plurality of locking grooves 273A into which the locked portions 113 of the hollow pipe 100 are fitted when the hollow pipe 100 is disposed in the molding space 60. The plurality of locking grooves 273A are arranged at equal intervals in the second direction D2. The pitch between adjacent locking grooves 273A is the same as the pitch between adjacent bent portions 112 of the hollow pipe 100. The locking groove 273A has a semicircular cross section. The locking grooves 273A are provided so as to be able to come into contact with the hollow pipe 100 (more specifically, the locked portion 113). The locking grooves 273A are formed so as to be able to clamp the locked portion 113. In this embodiment, the core 250 is provided with five locking grooves 273A, but the number of locking grooves 273A is not limited to five. The lengths of the locking grooves 273A in the first direction D1 are the same as each other. The lengths of the locking grooves 273A in the first direction D1 may be different from each other. For example, the lengths of some of the locking grooves 273A in the first direction D1 may be different from the lengths of other locking grooves 273A in the first direction D1.

[0084] 21, when the hollow pipe 100 is placed in the molding space 60, the movable mold-side groove 272, the fixed mold-side groove 271, and the core-side groove 273 hold the locked portion 113 of the hollow pipe 100, thereby suppressing movement of the hollow pipe 100 (particularly, movement of the middle portion 110 radially outward and in the second direction D2). When the hollow pipe 100 is placed in the molding space 60, the locked portion 113 of the hollow pipe 100 is fitted into the locking groove 272A of the movable mold-side groove 272, the locking groove 271A of the fixed mold-side groove 271, and the locking groove 273A of the core-side groove 273, thereby holding the middle portion 110 of the hollow pipe 100 in a predetermined position. In this embodiment, the core side groove 273 is located above the center of the middle portion 110 of the hollow pipe 100 in the third direction D3 and in the center portion of the middle portion 110 in the first direction D1. The movable mold side groove 272 is located below the center of the middle portion 110 of the hollow pipe 100 in the third direction D3 and closer to the first end portion 102 than the center of the middle portion 110 in the first direction D1. The fixed mold side groove 271 is located below the center of the middle portion 110 of the hollow pipe 100 in the third direction D3 and on the opposite side to the first end portion 102 than the center of the middle portion 110 in the first direction D1. Furthermore, when viewed from the direction of the center line 110C of the midway portion 110 (i.e., when viewed from the second direction D2), the inner surface 30A of the fixed mold 30, the inner surface 40A of the movable mold 40, and the inner surface 50A of the core 50 overlap with the center line 100C of the hollow pipe 100. Therefore, the recessed groove 270 reliably prevents the hollow pipe 100 from moving within the molding space 60, and the hollow pipe 100 can be more reliably held at a predetermined position in the molding space 60. Furthermore, when viewed from the direction of the center line 110C of the midway portion 110, the inner surface 30A of the fixed mold 30, the inner surface 40A of the movable mold 40, and the inner surface 50A of the core 50 may be located closer to the center line 110C of the midway portion 110 than the center line 100C of the hollow pipe 100. In this case, the recessed groove 270 can more reliably prevent the hollow pipe 100 from moving within the molding space 60, and more reliably keep the hollow pipe 100 at a predetermined position in the molding space 60. It is not necessary for all of the inner surface 30A of the fixed mold 30, the inner surface 40A of the movable mold 40, and the inner surface 50A of the core 50 to have the above-mentioned relationship, as long as at least some of them have the above-mentioned relationship.

[0085] In the mold 220 of this embodiment, the groove 270 is formed on the inner surface of the mold body 225. According to the above aspect, by arranging the hollow pipe 100 in the groove 270, the movement of the hollow pipe 100 can be easily suppressed.

[0086] In the mold 220 of this embodiment, the recessed groove 270 may be formed so as to be able to clamp the hollow pipe 100. According to the above-described aspect, since the hollow pipe 100 is clamped by the recessed groove 270, it is possible to more reliably suppress the movement of the hollow pipe 100.

[0087] In the mold 220 of this embodiment, the recessed groove 270 has a plurality of locking grooves 271A, 272A, 273A aligned in a predetermined direction and into which the locked portions 113 are fitted when the hollow pipe 100 is placed in the molding space 60. According to the above embodiment, the locked portions 113 are more reliably prevented from moving in the predetermined direction (e.g., the second direction D2), so that a casting 540 can be manufactured in which the hollow pipe 100 is precisely placed in a predetermined position.

[0088] In the mold 220 of this embodiment, the hollow pipe 100 may have a circular cross section, and the groove 270 may have a semicircular cross section. According to the above aspect, the hollow pipe 100 can be easily disposed in the groove 270.

[0089] In the casting 540 of this embodiment, a part of the midway portion 110 of the hollow pipe 100, i.e., the part in contact with the bottom of the recessed groove 270, is exposed to the outside from the metal material 120. According to the above-mentioned embodiment, the heat dissipation of the solvent and the like passing through the hollow pipe 100 is improved. In addition, the other part of the midway portion 110 is not exposed to the outside from the metal material 120, and is therefore protected by the metal material 120. In this way, by exposing a part of the midway portion 110 to the outside from the metal material 120, it is possible to provide an optimal casting 540 according to the intended use and the environment in which it is used.

[0090] In the casting 540 of this embodiment, the midway portion 110 has a plurality of exposed portions 114 that are exposed to the outside from the metal material 120 and are arranged in a predetermined direction (here, the second direction D2). According to the above-described embodiment, since the plurality of exposed portions 114 are exposed to the outside from the metal material 120, the heat dissipation property of the solvent or the like passing through the hollow pipe 100 is further improved.

[0091] In the casting 540 of the present embodiment, the midway portion 110 has a bent portion 112 formed in a spiral shape and bent in an arc shape, and a part of the bent portion 112 may be exposed to the outside from the metal material 120. According to the above-mentioned embodiment, the heat dissipation property of the solvent or the like passing through the hollow pipe 100 is improved.

[0092] In the casting 540 of the present embodiment, the midway portion 110 may have a plurality of bent portions 112 aligned in a predetermined direction. According to the above-described embodiment, the plurality of bent portions 112 are exposed to the outside from the metal material 120, so that the heat dissipation of the solvent or the like passing through the hollow pipe 100 is further improved.

[0093] In the casting 540 of this embodiment, a part of the midway portion 110 may be exposed to the outside at the recess 124. According to the above-mentioned embodiment, the heat dissipation property of the solvent or the like passing through the hollow pipe 100 is further improved.

[0094] Although the preferred embodiments of the present invention have been described above, the above-described embodiments are merely examples, and the present invention can be embodied in various other forms.

[0095] In the first embodiment described above, the fixed die 30, the movable die 40, and the core 50 are provided with the protruding members 70, but this is not limited to the above. For example, either the fixed die 30 or the movable die 40 may be provided with the protruding members 70, and the other of the fixed die 30 and the movable die 40 may be provided with the recessed grooves 270. Furthermore, the core 50 may be provided with the recessed grooves 270 instead of the protruding members 70. According to the above-mentioned embodiment, the movement of the hollow pipe 100 can be more reliably suppressed.

[0096] In the second embodiment described above, the grooves 270 are formed in the fixed die 230, the movable die 240, and the core 250, but this is not limited to the above. For example, one of the fixed die 230 and the movable die 240 may be provided with the protruding member 70, and the groove 270 may be formed in the other of the fixed die 230 and the movable die 240. Furthermore, the core 250 may be provided with the protruding member 70 instead of the groove 270. According to the above embodiment, the movement of the hollow pipe 100 can be more reliably suppressed.

[0097] In the above-described first embodiment, the mold 20 includes the core 50, but the mold 20 does not have to include the core 50. In addition, in the above-described second embodiment, the mold 220 includes the core 250, but the mold 220 does not have to include the core 250.

[0098] In the first embodiment described above, the protruding member 70 includes the fixed mold side protruding member 71 provided on the fixed mold 30, the movable mold side protruding member 72 provided on the movable mold 40, and the core side protruding member 73 provided on the core 50, but is not limited to this. It is sufficient that the protruding member 70 includes at least one of the fixed mold side protruding member 71, the movable mold side protruding member 72, and the core side protruding member 73.

[0099] In the first embodiment described above, the movable mold side protruding members 72 are aligned in a straight line in the second direction D2, but this is not limited thereto. For example, as shown in Fig. 22, the movable mold side protruding members 72 may be arranged offset in the third direction D3. The fixed mold side protruding members 71 are also not limited to being aligned in a straight line in the second direction D2, and may be arranged offset in the third direction D3. The core side protruding members 73 are also not limited to being aligned in a straight line in the second direction D2, and may be arranged offset in the first direction D1.

[0100] In the first embodiment described above, the multiple movable mold side protruding members 72 are arranged so as to be positioned between adjacent locked portions 113 when the hollow pipe 100 is placed in the molding space 60, but this is not limited to this. As shown in Fig. 23, the movable mold side protruding members 72 may be arranged in a portion not adjacent to the locked portions 113 (for example, a position that sandwiches the first end portion 102 or a position that sandwiches the second end portion 106).

[0101] In the above-described embodiment, injection port 65 is defined by movable mold side injection port 65A formed in movable mold 40 and fixed mold side injection port 65B formed in fixed mold 30, but this is not limited to this. For example, injection port 65 may be formed by movable mold 40, fixed mold 30, and core 50, and may be defined by movable mold side injection port 65A, fixed mold side injection port 65B, and a core side injection port formed in core 50.

[0102] In the above-described embodiment, when the hollow pipe 100 is arranged in the molding space 60 (i.e., when the hollow pipe is attached to the movable mold 40), the middle portion 110 of the hollow pipe 100 is not in contact with the inner surface 40A of the movable mold 40, the inner surface 30A of the fixed mold 30, and the inner surface 50A of the core 50, but a portion of the middle portion 110 may be in contact with the inner surface 40A, the inner surface 30A, and a portion of the inner surface 50A.

[0103] In the above-described embodiment, when the hollow pipe 100 is placed in the molding space 60 (i.e., when the hollow pipe is attached to the movable mold 40), all of the protruding members 70 are in contact with the hollow pipe 100, but when hollow pipes having different shapes or diameters are used in the same mold 20, the protruding members 70 that are in contact with the hollow pipe may differ depending on the type of hollow pipe. In other words, some of the protruding members 70 may not be in contact with the hollow pipe.

[0104] In the above-mentioned embodiment, the hollow pipe 100 has the intermediate portion 110 formed in a spiral shape, but the shape of the hollow pipe 100 is not limited thereto. For example, as shown in FIG. 24, the intermediate portion 110 may have a wavy line shape extending in a predetermined direction (here, the second direction D2). In this case, the manufactured casting is flat. According to the above-mentioned aspect, the intermediate portion 110 formed in a wavy line shape is likely to move in the second direction D2 when the molten metal material flows into the molding space 60, but the movement of the intermediate portion 110 in the second direction D2 is suppressed by the protruding member 70, so that a casting in which the hollow pipe 100 is accurately positioned at a predetermined position can be manufactured. As shown in FIG. 24, the movable die 340 may have a protruding member 70 similar to the movable die 40 of the first embodiment. In this case, the protruding amount of the protruding member 70 from the inner surface 40A is a length such that the intermediate portion 110 of the hollow pipe 100 is located on the inner surface 40A side from the tip of the protruding member 70. As shown in FIG. 25, a movable mold 440 may have a recessed groove 270 formed therein similar to that of the movable mold 240 of the second embodiment.

[0105] In the above-described embodiment, the molten metal material is injected into the molding space 60 in a state where the hollow pipe 100 is filled with an incompressible fluid, thereby filling the molding space 60 with the molten metal material, but the present invention is not limited to this. For example, the molten metal material may be injected into the molding space 60 in a state where the hollow pipe 100 is not filled with an incompressible fluid (i.e., the hollow pipe 100 is hollow), thereby filling the molding space 60 with the molten metal material.

[0106] In the above-described embodiment, the hollow pipe 100 is used as an example of a pipe, but a solid pipe may be used. When a solid pipe is used, for example, the hollow pipe 100 is filled with a filler such as a solid material such as salt or a non-compressible fluid, and is placed in the molding space 60 in a solid state. For example, in the manufacturing method of the above-described embodiment, the fluid filling step (step S40) is performed after the placement step (step S20), but the fluid filling step (step S40) may be performed before the placement step (step S20). That is, before placing the hollow pipe 100 in the molding space 60, for example, a filler may be filled in the hollow pipe 100, and the hollow pipe 100 in a solid state filled with the filler may be placed in the molding space 60. In this case, the filler filled in the hollow pipe 100 may be discharged before removing the casting 140 from the die 20, or may be discharged after removing the casting 140 from the die 20.

[0107] Other specific aspects of the technology disclosed herein include those described in the following sections. Clause 1: A casting manufacturing apparatus includes a fixed mold and a movable mold that can approach or move away from the fixed mold, and is equipped with a mold configured so that a pipe having a first straight portion with a first opening formed at one end, a second straight portion having a second opening formed at the other end and parallel to the first straight portion, and a main body portion located between the first straight portion and the second straight portion is placed in a molding space formed by the movable mold and the fixed mold, and the fixed mold or the movable mold includes a first holding portion into which the first straight portion is inserted and which holds the first straight portion, and a second holding portion into which the second straight portion is inserted and which holds the second straight portion. According to the above aspect, the first straight portion and the second straight portion are parallel to each other, and the fixed or movable mold includes a first holding portion into which the first straight portion is inserted and which holds the first straight portion, and a second holding portion into which the second straight portion is inserted and which holds the second straight portion, thereby improving the workability of attaching the pipe to the fixed or movable mold. Note that the pipe may be filled with a non-compressible fluid before being attached to the fixed or movable mold, or the pipe may be attached to the fixed or movable mold while remaining hollow without filling the pipe with a non-compressible fluid. Here, the first holding portion and the second holding portion may be provided in the same mold, and the first straight portion and the second straight portion may be attached to the same mold. By providing the first holding portion and the second holding portion in the same mold, and attaching the first straight portion and the second straight portion to the same mold, the workability of attaching the pipe to the mold is further improved. [Explanation of symbols]

[0108] 10 Casting manufacturing equipment 20 Mold 25-inch body 30 Fixed type 40 Movable type 42 Holding part 50 Core 60 Molding space 65 Inlet 70 Protruding member (restraining member) 71 Fixed type side protruding member 72 Movable mold side protruding member 73 Core side protruding member 80 Filling material conveying device 90 Metal material transport device 100 Hollow pipe (pipe) 102 first end 106 Second End 110 Middle part 112 Bend 113 Locked part 120 Metal materials 122 Inner surface 124 Recess 140 Castings 150 Slide core 150S outer surface 152 Protrusion (restraint member) 270 Groove (restraint member)

Claims

1. A mold body including a fixed mold and a movable mold that can approach or move away from the fixed mold; a molding space defined by at least the fixed mold and the movable mold and capable of accommodating a pipe; an injection port capable of injecting a molten metal material into the molding space; a holding portion for holding both ends of the pipe; and a suppression member that suppresses movement of the pipe within the molding space when the molten metal material is injected into the molding space.

2. The mold according to claim 1 , wherein the suppression member is integrally formed with the mold body.

3. The mold according to claim 1 or 2, wherein the suppression member is a protruding member that protrudes from an inner surface of the mold body toward the molding space.

4. A plurality of the protruding members are provided, The pipe has a first end, a second end aligned with the first end in a predetermined direction, and a middle portion located between the first end and the second end, The intermediate portion includes a plurality of engaged portions aligned in the predetermined direction, The mold according to claim 3 , wherein the plurality of protruding members are provided so as to be respectively positioned between adjacent ones of the locked portions when the pipe is placed in the molding space.

5. The mold according to claim 4 , wherein the amounts of protrusion of the plurality of protruding members from the inner surface of the mold body are the same for each other.

6. The mold according to claim 4 , wherein the amount of protrusion of some of the plurality of protruding members from the inner surface of the mold body is different from the amount of protrusion of other of the plurality of protruding members from the inner surface of the mold body.

7. The mold according to claim 4 , wherein the distance between adjacent protruding members on the tip side is wider than the distance between adjacent protruding members on the base side.

8. The mold according to claim 1 , wherein the suppression member is a groove formed on the inner surface of the mold body.

9. The mold according to claim 8 , wherein the groove is formed so as to be able to clamp the pipe.

10. The pipe has a first end, a second end aligned with the first end in a predetermined direction, and a middle portion located between the first end and the second end, The intermediate portion includes a plurality of engaged portions aligned in the predetermined direction, The mold according to claim 8 , wherein the recessed groove has a plurality of locking grooves aligned in the predetermined direction and into which the locked portions are fitted when the pipe is placed in the molding space.

11. The pipe has a circular cross section, The mold according to claim 8 , wherein the groove has a semicircular cross section.

12. A plurality of the suppression members are provided, The mold body has a first inner surface and a second inner surface opposite to the first inner surface, Some of the suppression members are provided on the first inner surface, The mold according to claim 1 or 2, wherein another part of the plurality of suppression members is provided on the second inner surface.

13. A plurality of the suppression members are provided, Some of the suppression members are provided on an inner surface of the fixed mold, The mold according to claim 1 or 2, wherein another part of the plurality of suppression members is provided on an inner surface of the movable mold.

14. The mold body includes a core, at least a portion of which is located between the fixed mold and the movable mold; The molding space is defined by at least the fixed mold, the movable mold, and the core, The mold according to claim 13 , wherein some of the suppression members are provided on an inner surface of the core.

15. The mold according to claim 1 , wherein the suppression member is detachably provided on the mold body.

16. The fixed die and the movable die are each provided with the suppression member, the suppression member provided in the fixed mold is a protruding member protruding from an inner surface of the fixed mold toward the molding space, The mold according to claim 1 , wherein the suppression member provided on the movable die is a groove formed on an inner surface of the movable die.

17. The fixed die and the movable die are each provided with the suppression member, the suppression member provided on the fixed mold is a groove formed on an inner surface of the fixed mold, The mold according to claim 1 , wherein the suppression member provided on the movable mold is a protruding member that protrudes from an inner surface of the movable mold toward the molding space.

18. The pipe has a first end, a second end aligned with the first end in a predetermined direction, and a middle portion located between the first end and the second end, The mold according to claim 1 , wherein the suppression member is configured to suppress movement of the intermediate portion in the predetermined direction.

19. The mold according to claim 18 , wherein the intermediate portion is formed in a spiral shape extending in the predetermined direction.

20. The mold according to claim 18 , wherein the midway portion is formed in a wavy line shape extending in the predetermined direction.

21. The mold according to claim 18 , wherein at least a tip portion of the suppression member is formed so as to have a diameter that decreases toward the tip.

22. The pipe has a first end, a second end aligned with the first end in a predetermined direction, and a middle portion located between the first end and the second end, The midway portion is formed in a spiral shape extending in the predetermined direction, The mold according to claim 1 , wherein the suppression member is configured to suppress movement of the midway portion in a direction intersecting the predetermined direction.

23. The mold according to claim 22 , wherein the inhibiting member is configured to inhibit the midway portion from moving in a direction perpendicular to the predetermined direction.

24. The suppression member protrudes from an inner surface of the mold body toward the pipe, The mold according to claim 22 , wherein at least a tip portion of the suppression member is formed so as to have a diameter that decreases toward the tip.

25. The mold body includes a slide core that extends in the predetermined direction and is inserted into the middle portion, The molding space is defined by at least the fixed die, the movable die, and the slide core, The mold according to claim 22 , wherein the suppression member includes a protrusion formed on an outer circumferential surface of the slide core and protruding toward the intermediate portion.

26. 26. The mold of claim 25, wherein the protrusions extend in the predetermined direction.

27. a discharge port communicating with the injection port and discharging the molten metal material into the molding space; The mold according to claim 25, wherein at least a portion of the protrusion is provided to face the discharge port when the slide core is inserted into the intermediate portion.

28. The slide core is formed in a cylindrical shape, The mold according to claim 25, wherein a plurality of the protrusions are formed on the outer circumferential surface of the slide core, the protrusions being spaced apart from one another in the circumferential direction of the slide core.

29. the suppression member includes a protruding member protruding from an inner surface of the mold body toward the molding space, The protruding member is configured to suppress movement of the intermediate portion in the predetermined direction, The mold according to claim 25, wherein when viewed from the predetermined direction in a state in which the slide core is inserted into the intermediate portion, the protruding portion is provided at a position facing at least a portion of the protruding member.

30. the suppression member includes a first protruding member and a second protruding member protruding from an inner surface of the mold body toward the molding space, the first protruding member and the second protruding member are configured to protrude toward different circumferential portions of the midway portion and to suppress movement of the midway portion in the predetermined direction, 26. The mold according to claim 25, wherein when viewed from the predetermined direction in a state in which the slide core is inserted into the middle portion, the protruding portion is located between the first protruding member and the second protruding member in the circumferential direction of the middle portion.

31. a mold including a fixed die, a movable die capable of approaching or moving away from said fixed die, a molding space partitioned by at least said fixed die and said movable die and capable of arranging a pipe, an injection port capable of injecting molten metal material into said molding space, holding portions for holding both ends of said pipe, and a suppression member for suppressing movement of said pipe within said molding space when said molten metal material is injected into said molding space; a metal material transport device that injects the molten metal material from the injection port into the molding space.

32. A method for manufacturing a casting comprising a pipe and a metal material surrounding the pipe, a preparation process for preparing a mold including a fixed mold, a movable mold capable of approaching or moving away from the fixed mold, a molding space partitioned by at least the fixed mold and the movable mold and capable of arranging the pipe, an injection port capable of injecting molten metal material into the molding space, holding portions for holding both ends of the pipe, and a suppression member for suppressing movement of the pipe within the molding space when the molten metal material is injected into the molding space; an arrangement step of holding the pipe in the holding portion so that the pipe contacts the suppression member and arranging the pipe in the molding space; a mold clamping process of closing the mold by bringing the movable mold closer to the fixed mold; a filling step of injecting the molten metal material into the molding space through the injection port to fill the molding space with the molten metal material; and a removal step of moving the movable die away from the fixed die to open the metal mold and remove the casting.

33. The manufacturing method according to claim 32, further comprising a fluid filling step, prior to the filling step, of injecting an incompressible fluid from one end of the pipe to fill the pipe with the incompressible fluid.

34. The manufacturing method according to claim 33, further comprising a discharging step of discharging the incompressible fluid filled in the pipe prior to the removing step.

35. The pipe is a hollow pipe, The manufacturing method according to claim 32, wherein in the arranging step, the hollow pipe is held by the holding part and the hollow pipe is arranged in the molding space.

36. Pipes and A metal material that casts the pipe, The pipe is A first end; A second end. a middle portion located between the first end and the second end, the first end and the second end protrude outwardly from the metal material; A casting, wherein a portion of the intermediate portion is exposed to the outside from the metal material.

37. the first end and the second end are aligned in a predetermined direction, The casting according to claim 36, wherein the intermediate portion has a plurality of exposed portions that are exposed to the outside from the metallic material and aligned in the predetermined direction.

38. The intermediate portion has a bent portion that is formed in a spiral shape and bent in an arc shape, 37. The casting of claim 36, wherein a portion of the bend is exposed externally from the metallic material.

39. the first end and the second end are aligned in a predetermined direction, The casting according to claim 38, wherein the intermediate portion has a plurality of the bent portions aligned in the predetermined direction.

40. A recess is formed on the surface of the metal material, 37. The casting according to claim 36, wherein a portion of the intermediate portion is exposed to the outside at the recess.

41. Pipes and A metal material that casts the pipe, The pipe is A first end; a second end aligned with the first end in a predetermined direction; a middle portion located between the first end and the second end, The midway portion is formed in a spiral shape extending in the predetermined direction, The metal material is a casting having an inner circumferential surface located radially inward from the middle portion when viewed from the specified direction, and a recess extending radially outward from the inner circumferential surface.

42. 42. The casting of claim 41, wherein the recess extends in the predetermined direction.

43. The casting according to claim 42, wherein the recess is open in the predetermined direction at one end of the inner circumferential surface in the predetermined direction.

44. The casting according to claim 43, wherein the recess is open in the predetermined direction at the other end of the inner circumferential surface in the predetermined direction.

45. 42. The casting of claim 41, wherein the metallic material has a plurality of the recesses aligned in the predetermined direction.

46. The casting according to claim 45, wherein the recess is formed in a circular shape when viewed in a direction along which a straight line perpendicular to the predetermined direction and passing through a center of the recess extends.

47. The casting according to claim 46, wherein the recess is formed so as to increase in diameter from an outer side in the radial direction toward an inner side in the radial direction.

48. 42. The casting according to claim 41, wherein the metal material has an outer circumferential surface located radially outward from the intermediate portion when viewed from the predetermined direction, and another recessed portion recessed radially inward from the outer circumferential surface.

49. 49. The casting of claim 48, wherein the metallic material has a plurality of the other recesses aligned in the predetermined direction.

50. The casting according to claim 49, wherein the other recess is formed in a circular shape when viewed in a direction along which a straight line perpendicular to the predetermined direction and passing through a center of the other recess extends.

51. The casting according to claim 50, wherein the other recess is formed so as to increase in diameter from an inner side in the radial direction toward an outer side in the radial direction.

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