Ceramic-based composite turbine shaft connection transition piece preparation tool

Abstract

The invention discloses a ceramic-based composite turbine shaft connection transition piece preparation tool which comprises a base, a rotatable first supporting piece is arranged on the top face of the base, movable second supporting pieces are arranged on the two sides of the first supporting piece, and an inner mold used for installing a prefabricated body is arranged on the first supporting piece; the second supporting piece is provided with an outer mold matched with the prefabricated body in shape, and the pneumatic device is used for driving the outer mold and the inner mold to clamp the prefabricated body and enabling the prefabricated body to be automatically aligned at the same time. In the preparation process of the connecting transition piece, the forming angle and the curved surface of the prefabricated body can be accurately controlled, automatic alignment during mold pressing of the prefabricated body can be achieved, the prefabricated body with a complex molded surface is prevented from being twisted and deformed in the mold pressing process, and it is ensured that the quality of the prefabricated body formed subsequently meets the requirement.

Description

Technical Field

[0001] The invention relates to the technical field of positioning and forming, and in particular to a tool for preparing a ceramic-based composite turbine shaft connection transition piece. Background Art

[0002] With the rapid development of modern industrial technology, ceramic-based composite materials are widely used in the aerospace field due to their excellent properties, such as high strength, high hardness, high temperature resistance, wear resistance, and strong chemical stability. Ceramic-based composite transition parts, as important components for connection, support, and transmission functions, are widely used in industrial fields with complex structures and high performance requirements. In the preparation process of transition parts, the wire harness of ceramic-based composite materials is first woven into a preform, and the final transition part is formed through subsequent processes on the basis of the preform. The shape of the preform is the same as that of the transition part. Therefore, the transition part faces many technical challenges in actual production and processing, especially in the processing of parts with irregular curved surface structures and multi-angle complex shapes. The technical bottleneck is more significant.

[0003] The preforms of ceramic-based composite materials often have complex transition curves and cross-transition characteristics of angled surfaces due to the streamlined design of their transition surfaces, which makes it difficult for traditional processing technology to effectively meet the quality requirements of preform morphology processing. Summary of the invention

[0004] The purpose of the present invention is to provide a ceramic-based composite turbine shaft connection transition piece preparation tooling, during the preparation process of the connection transition piece, the forming angle and curved surface of the preform can be controlled more accurately, and the preform can be automatically aligned when it is pressed into a mold, thereby avoiding twisting and deformation of the complex surface preform during the molding process, and ensuring that the quality of the preform subsequently formed meets the requirements.

[0005] In order to solve the above technical problems, the present invention adopts the following solutions:

[0006] A ceramic-based composite turbine shaft connection transition piece preparation tool, comprising a base, a rotatable first support member is provided on the top surface of the base, movable second support members are provided on both sides of the first support member, an inner mold for mounting a preform is provided on the first support member, an outer mold adapted to the shape of the preform is provided on the second support member, and also includes a pneumatic device for driving the outer mold and the inner mold to clamp the preform and automatically align the preform at the same time.

[0007] In this solution, the base serves as the foundation of the entire tooling and provides a stable supporting platform. The first support member is installed on the top surface of the base and can rotate, providing a basis for the subsequent alignment of the preform. The second support members are arranged on both sides of the first support member and are movable. By adjusting the position of the second support member, it can be ensured that the outer mold is perfectly matched with the shape of the preform, which provides convenience for subsequent clamping and alignment operations. The inner mold is installed on the first support member for installing the preform. The shape and size of the inner mold must match the interior of the preform to ensure that the preform maintains a stable shape during the processing. The outer mold is installed on the second support member and is matched with the shape of the preform. The outer mold not only fixes the preform, but also provides necessary support and protection for the preform during the processing. The pneumatic device is responsible for driving the outer mold to move and clamp the preform at the same time as the inner mold. The rotation of the inner mold during clamping automatically adjusts the position of the preform to achieve alignment. The pneumatic device makes the outer mold approach the preform until it clamps the preform with the inner mold, ensuring the stability of the preform during the processing, ensuring that the preform is evenly stressed to avoid stress concentration and deformation. While clamping the preform, the clamping force generated causes the inner mold to rotate so that the preform can fine-tune its position according to its own shape. Finally, the preform automatically adjusts to the correct position. This alignment operation can ensure that the preform maintains precise shape and size during subsequent processing, avoids distortion and deformation of the complex surface of the preform during the molding process, and ensures that the quality of the preform formed subsequently meets the requirements.

[0008] Optionally, the pneumatic device is fixed on the brackets on both sides of the base, and the pneumatic device is located on the outside of the first support member. The pneumatic device horizontally drives the outer mold to approach the inner mold until the preform is clamped with the inner mold. Under the action of the clamping force, the inner mold rotates so that the preform fits the inner mold and is automatically aligned.

[0009] Optionally, the pneumatic device is a telescopic cylinder, which is horizontally fixed on a bracket, a bottom end of the bracket is fixed on a base, and a telescopic rod of the telescopic cylinder faces the first support member.

[0010] Optionally, the second support member includes a mounting seat and a support arm, the mounting seat is in sliding contact with the base, the top surface of the mounting seat is connected to the bottom end of the support arm, the side of the support arm is detachably connected to a support rod, and the support rod is connected to the outer wall of the outer mold.

[0011] Optionally, two support rods are provided, the two support rods are arranged in parallel up and down, the support rods are horizontally facing the first support member, and the support rods are connected to the support arm by fixing bolts.

[0012] Optionally, the base is provided with a slide groove adapted to the mounting seat, the top surface of the mounting seat is provided with a waist-shaped hole, the waist-shaped hole passes through the mounting seat from top to bottom, the base is provided with an internal threaded hole, the mounting seat and the base are connected by a locking bolt, and the locking bolt passes through the waist-shaped hole and is threadedly connected to the internal threaded hole.

[0013] Optionally, the first support member includes a fixed seat, a rotating shaft and a bearing, the bearing is embedded in the top of the fixed seat, the lower end of the rotating shaft is connected to the inner ring of the bearing, the upper end of the rotating shaft is connected to the bottom surface of the inner mold, and the top surface of the base is provided with an installation cavity for installing the fixed seat.

[0014] Optionally, the shape of the inner mold is adapted to the inner cavity of the preform, and the inner mold is composed of an upper square part and a lower circular part. The four corners of the square part are arc corners, and an arc-shaped transition zone is formed in the connecting area between the square part and the circular part. The square part and the circular part are integrally formed.

[0015] Optionally, the outer mold is composed of two symmetrical templates, and the cavity formed when the two templates are closed is adapted to the shape of the preform.

[0016] Optionally, the inner mold and the outer mold are both made of graphite material, and the outer mold and the inner mold are both solid bodies.

[0017] The present invention has the beneficial effects:

[0018] 1. The use of graphite inner and outer molds solves the problem of difficult preform molding with complex transition surfaces, and the graphite material will not contaminate the preform.

[0019] 2. The pneumatic device of the tooling and the sliding of the mounting seat make the pressure of the molding process and the gap between the inner mold and the outer mold adjustable, which can finely control the molding angle, curved surface and size of the product molding process to ensure that the prefabricated body is evenly stressed to avoid stress concentration and deformation.

[0020] 3. The rotatable inner mold enables the preform to be automatically positioned and aligned according to the outer shape during molding, avoiding distortion and deformation of the complex surface preform during the molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the distribution structure of the slideway on the base;

[0023] Figure 3 It is a schematic diagram of the distribution structure of waist-shaped holes on the mounting seat;

[0024] Figure 4 This is the structural diagram of the inner mold;

[0025] Figure 5 This is a schematic diagram of the structure of the preform.

[0026] Figure markings: 1-inner mold, 101-square part, 102-circular part, 2-arc-shaped transition zone, 3-circular opening, 4-inner cavity, 5-preform, 6-mounting seat, 7-fixing seat, 8-bearing, 9-rotating shaft, 10-locking bolt, 11-outer mold, 12-support rod, 13-fixing bolt, 14-support arm, 15-pneumatic device, 16-bracket, 17-base, 18-slide groove, 19-mounting cavity, 20-inner threaded hole, 21-waist-shaped hole, 22-square opening. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example

[0031] A ceramic-based composite turbine shaft connection transition piece preparation tool, including a base 17, a top surface of the base 17 is provided with a rotatable first support member, movable second support members are provided on both sides of the first support member, the first support member is provided with an inner mold 1 for mounting a preform 5, the second support member is provided with an outer mold 11 adapted to the shape of the preform 5, and also includes a pneumatic device 15 for driving the outer mold 11 and the inner mold 1 to clamp the preform 5 and automatically align the preform 5 at the same time.

[0032] In this embodiment, Figure 5As shown, the preform 5 is the core structure of the transition piece. One end of the preform 5 is a square opening, and the other end is a circular opening 3. The square opening 22 is connected to the circular opening 3, that is, the preform 5 has an inner cavity 4, and the size of the inner cavity 4 is adapted to the inner mold 1. The preform 5 is directly mounted on the inner mold 1. The preform 5 is composed of a fiber bundle of a ceramic-based composite material. The preform 5 itself has a certain rigidity, so that the preform 5 is not easy to collapse when it is mounted on the inner mold 1, which is convenient for automatic alignment during subsequent extrusion. Having a certain rigidity refers to a woven basket, backpack, etc., which can maintain the corresponding shape after weaving, but its shape needs to be further finalized by mold extrusion. The base 17 serves as the foundation of the entire tooling and provides a stable support platform, such as Figure 1 As shown, the first support member is installed on the top surface of the base 17 and can rotate, providing a basis for the subsequent alignment of the preform 5. The second support members are arranged on both sides of the first support member and are movable. By adjusting the position of the second support member, it can be ensured that the outer mold 11 is perfectly adapted to the shape of the preform 5, which facilitates the subsequent clamping and alignment operations. The inner mold 1 is installed on the first support member for installing the preform 5. The shape and size of the inner mold 1 must match the interior of the preform 5 to ensure that the preform 5 maintains a stable shape during the processing. The outer mold 11 is installed On the second support member, which is adapted to the shape of the preform 5, the outer mold 11 not only fixes the preform 5, but also provides necessary support and protection for the preform 5 during the processing. The pneumatic device 15 is responsible for driving the outer mold 11 to move and clamp the preform 5 at the same time as the inner mold 1. When clamping, the air in the preform 5 can be squeezed out, making the gap between the fiber bundles of the ceramic-based composite material smaller, the preform 5 more dense, and the strength of the transition piece formed later better. When clamping, the rotation of the inner mold 1 can automatically adjust the position of the preform 5 to achieve alignment. The pneumatic device 15 makes the outer mold 11 approach the preform 5 until it clamps the preform 5 with the inner mold 1, ensuring the stability of the preform 5 during the processing, ensuring that the preform 5 is evenly stressed to avoid stress concentration and deformation. While clamping the preform 5, the clamping force generated causes the inner mold 1 to rotate so that the preform 5 can fine-tune its position according to its own shape, and finally the preform 5 automatically adjusts to the correct position. This alignment operation can ensure that the preform 5 maintains an accurate shape and size during the subsequent processing, avoids the complex surface of the preform 5 from twisting and deformation during the molding process, and ensures that the quality of the preform 5 formed subsequently meets the requirements.

[0033] Furthermore, the pneumatic device 15 is fixed on the brackets 16 on both sides of the base 17, and the pneumatic device 15 is located on the outside of the first support member. The pneumatic device 15 horizontally drives the outer mold 11 to approach the inner mold 1 until the preform 5 is clamped with the inner mold 1. Under the action of the clamping force, the inner mold 1 rotates so that the preform 5 is adapted to the inner mold 1 and automatically aligned.

[0034] Specifically, the pneumatic device 15 is fixedly mounted on the brackets 16 on both sides of the base 17, ensuring that the pneumatic device 15 has sufficient stability and supporting force during operation. The pneumatic device 15 is located on the outside of the first support member. When the pneumatic device 15 drives the outer mold 11, it will not be interfered by the first support member, so that the clamping and alignment operations can be more effectively achieved. The pneumatic device 15 drives the outer mold 11 to approach the inner mold 1 in a horizontal manner. This driving method ensures the uniform distribution of the clamping force and avoids deformation or damage of the preform 5 caused by uneven clamping force. When the outer mold 11 gradually approaches the inner mold 1 under the drive of the pneumatic device 15, it will clamp the preform 5 together with the inner mold 1. This clamping method not only ensures the stability of the preform 5 during the processing process, but also prevents it from deforming in harsh environments such as high temperature and high pressure. Automatic control can be achieved through an external controller (PLC), which can ensure that the pressure applied by the pneumatic device 15 is controllable, and the gap between the inner mold 1 and the outer mold 11 can be precisely adjusted, so that the molding angle, curved surface and size of the preform 5 during the extrusion molding process can be more accurately controlled to ensure that the preform 5 is evenly stressed to avoid stress concentration and deformation. Under the action of the clamping force, if the position of the preform 5 is incorrect, the wall of its inner cavity 4 will not fit with the inner mold 1. Under the action of pressure, the inner mold 1 will rotate slightly to adapt to the shape of the inner cavity 4 of the preform 5. This adaptive rotation process allows the preform 5 to achieve the best adaptation state with the inner mold 1, and realizes the automatic alignment of the preform 5. This alignment method not only improves the accuracy of the preparation process, but also reduces the need for manual intervention.

[0035] The workflow is optimized to avoid distortion and deformation of the complex surface of the preform 5 during the forming process.

[0036] Specific steps:

[0037] Preparation stage: placing the preform 5 in the inner mold 1 on the first support member, and adjusting the position of the second support member so that the outer mold 11 roughly matches the shape of the preform 5 .

[0038] Clamping and alignment: Start the pneumatic device 15 to make the outer mold 11 approach the inner mold 1 in the horizontal direction until it clamps the preform 5 together with the inner mold 1. Under the action of the clamping force, the inner mold 1 will rotate adaptively so that the preform 5 and the inner mold 1 reach the best adaptation state and realize automatic alignment. After the processing is completed, the remaining processes can be carried out.

[0039] Furthermore, the pneumatic device 15 is a telescopic cylinder, which is horizontally fixed on a bracket 16, the bottom end of the bracket 16 is fixed on a base 17, and the telescopic rod of the telescopic cylinder faces the first support member.

[0040] Furthermore, the second support member includes a mounting seat 6 and a support arm 14. The mounting seat 6 is in sliding contact with the base 17. The top surface of the mounting seat 6 is connected to the bottom end of the support arm 14. The side of the support arm 14 is detachably connected to a support rod 12, and the support rod 12 is connected to the outer wall of the outer mold 11.

[0041] Furthermore, two support rods 12 are provided, and the two support rods 12 are arranged in parallel up and down, and the support rods 12 are horizontally facing the first support member, and the support rods 12 are connected to the support arm 14 by fixing bolts 13.

[0042] Furthermore, the base 17 is provided with a slide groove 18 adapted to the mounting seat 6, and the top surface of the mounting seat 6 is provided with a waist-shaped hole 21, which passes through the mounting seat 6 from top to bottom. The base 17 is provided with an internal threaded hole 20, and the mounting seat 6 and the base 17 are connected by a locking bolt 10, and the locking bolt 10 passes through the waist-shaped hole 21 and is threadedly connected to the internal threaded hole 20.

[0043] Specifically, Figure 2 As shown, the base 17 is provided with a slide groove 18 adapted to the mounting seat 6. The mounting seat 6 can slide along the length direction of the slide groove 18 under the action of the pneumatic device 15, thereby driving the outer mold 11 to approach and clamp the preform 5, as shown in FIG. Figure 3 As shown, a waist-shaped hole 21 is provided on the top surface of the mounting seat 6, and the waist-shaped hole 21 passes through the mounting seat 6 from top to bottom. The design of the waist-shaped hole 21 provides additional adjustment space, because the locking bolt 10 can move within a certain range in the long axis direction of the waist-shaped hole 21. Before the preform 5 is clamped, the locking bolt 10 will not lock the mounting seat 6 on the base 17. At this time, under the action of the pneumatic device 15, there is a relative displacement between the mounting seat 6 and the locking bolt 10, so that the outer mold 11 can be close to the preform 5. After the outer mold 11 and the inner mold 1 clamp the preform 5 and the preform 5 is automatically aligned, the locking bolt 10 is tightened to ensure that the position of the mounting seat 6 does not change, thereby ensuring that the outer mold 11 and the inner mold 1 can stably clamp the preform 5.

[0044] Furthermore, the first support member includes a fixed seat 7, a rotating shaft 9 and a bearing 8, the bearing 8 is embedded in the top of the fixed seat 7, the lower end of the rotating shaft 9 is connected to the inner ring of the bearing 8, the upper end of the rotating shaft 9 is connected to the bottom surface of the inner mold 1, and the top surface of the base 17 is provided with an installation cavity 19 for installing the fixed seat 7.

[0045] Furthermore, the outer shape of the inner mold 1 is adapted to the inner cavity 4 of the preform 5. The inner mold 1 is composed of an upper square portion 101 and a lower circular portion 102. The four corners of the square portion 101 are arc corners. An arc-shaped transition zone 2 is formed in the connecting area between the square portion 101 and the circular portion 102. The square portion 101 and the circular portion 102 are integrally formed.

[0046] Specifically, Figure 4As shown, the inner mold 1 is composed of a square portion 101 and a circular portion 102. The four outer corners of the square portion 101 are all arc corners, the surface of the circular portion 102 is also an arc surface, and the connecting area between the two is also an arc transition zone 2. In this way, the surface of the entire inner mold 1 is streamlined. In this way, when the preform 5 is clamped, the preform 5 and the inner mold 1 can rotate relative to each other more flexibly, so that the automatic alignment of the preform 5 is faster and more accurate.

[0047] Furthermore, the outer mold 11 is composed of two symmetrical templates, and the cavity formed when the two templates are closed is adapted to the shape of the preform 5.

[0048] Specifically, the outer mold 11 is composed of two symmetrical templates. This symmetrical design not only enables the outer mold 11 to form a uniform clamping force when it is closed, but also improves the overall strength and stability of the outer mold 11. The shape of the cavity formed when the two templates are closed is completely compatible with the shape of the preform 5. This design ensures that the preform 5 can be tightly wrapped and fixed during the processing, thereby avoiding processing errors caused by looseness or deformation. Since the outer mold 11 is composed of two independent templates, it can adapt to preforms 5 of different shapes and sizes by adjusting the spacing or angle between the templates. This adjustability improves the flexibility and adaptability of the preparation tooling, allowing it to be applied to a wider range of preparation scenarios.

[0049] Clamping and fixing: When the pneumatic device 15 drives the outer mold 11 to approach the inner mold 1, the two mold plates will gradually close and clamp the preform 5. Since the shape of the cavity is adapted to the shape of the preform 5, it can be ensured that the preform 5 will not be subjected to excessive pressure or deformation during the clamping process.

[0050] Automatic alignment: Under the action of the clamping force, the inner mold 1 will rotate adaptively to achieve the best fit with the preform 5. At the same time, since the cavity of the outer mold 11 is completely compatible with the shape of the preform 5, the preform 5 can also be automatically aligned to a certain extent. This alignment method not only improves the accuracy and efficiency of the preparation process, but also reduces the need for manual intervention.

[0051] Furthermore, the inner mold 1 and the outer mold 11 are both made of graphite material, and the outer mold 11 and the inner mold 1 are both solid bodies. The inner mold 1 and the outer mold 11 made of graphite material will not contaminate the preform 5.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A ceramic-based composite turbine shaft connection transition piece preparation tool, comprising a base (17), characterized in that: The top surface of the base (17) is provided with a rotatable first support member, and movable second support members are provided on both sides of the first support member. The first support member is provided with an inner mold (1) for mounting the preform (5), and the second support member is provided with an outer mold (11) adapted to the shape of the preform (5). The base also includes a pneumatic device (15) for driving the outer mold (11) and the inner mold (1) to clamp the preform (5) and simultaneously automatically align the preform (5).

2. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 1, characterized in that: The pneumatic device (15) is fixed on the brackets (16) on both sides of the base (17). The pneumatic device (15) is located outside the first support member. The pneumatic device (15) horizontally drives the outer mold (11) to approach the inner mold (1) until the preform (5) is clamped with the inner mold (1). Under the action of the clamping force, the inner mold (1) rotates so that the preform (5) and the inner mold (1) are adapted and automatically aligned.

3. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 2, characterized in that: The pneumatic device (15) is a telescopic cylinder, which is horizontally fixed on a bracket (16), the bottom end of the bracket (16) is fixed on a base (17), and the telescopic rod of the telescopic cylinder faces the first support member.

4. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 1, characterized in that: The second support member comprises a mounting seat (6) and a support arm (14); the mounting seat (6) is in sliding contact with the base (17); the top surface of the mounting seat (6) is connected to the bottom end of the support arm (14); the side of the support arm (14) is detachably connected to a support rod (12); and the support rod (12) is connected to the outer wall of the outer mold (11).

5. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 4, characterized in that: Two support rods (12) are provided, and the two support rods (12) are arranged in parallel up and down. The support rods (12) are horizontally oriented toward the first support member, and the support rods (12) are connected to the support arms (14) via fixing bolts (13).

6. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 4, characterized in that: The base (17) is provided with a slide groove (18) adapted to the mounting seat (6); the top surface of the mounting seat (6) is provided with a waist-shaped hole (21), the waist-shaped hole (21) passes through the mounting seat (6) from top to bottom; the base (17) is provided with an internal threaded hole (20), the mounting seat (6) and the base (17) are connected by a locking bolt (10), and the locking bolt (10) passes through the waist-shaped hole (21) and is threadedly connected to the internal threaded hole (20).

7. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 1, characterized in that: The first support member comprises a fixed seat (7), a rotating shaft (9) and a bearing (8); the bearing (8) is embedded in the top of the fixed seat (7); the lower end of the rotating shaft (9) is connected to the inner ring of the bearing (8); the upper end of the rotating shaft (9) is connected to the bottom surface of the inner mold (1); and the top surface of the base (17) is provided with an installation cavity (19) for installing the fixed seat (7).

8. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 1, characterized in that: The outer shape of the inner mold (1) is adapted to the inner cavity (4) of the preform (5); the inner mold (1) is composed of an upper square portion (101) and a lower circular portion (102); the four corners of the square portion (101) are arc corners; an arc-shaped transition zone (2) is formed in the connection area between the square portion (101) and the circular portion (102); and the square portion (101) and the circular portion (102) are integrally formed.

9. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 1, characterized in that: The outer mold (11) is composed of two symmetrical templates, and the cavity formed when the two templates are closed is adapted to the outer shape of the preform (5).

10. The ceramic-based composite turbine shaft connection transition piece preparation tool according to claim 1, characterized in that: The inner mold (1) and the outer mold (11) are both made of graphite material, and the outer mold (11) and the inner mold (1) are both solid bodies.

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