Manufacturing process of a tubular mold for casting

Abstract

A manufacturing process of a tubular mold for casting, comprising the steps of: S1, pouring an outer support layer metal melt (5) in a centrifugal casting mold (10) to form an outer support layer (1); S2, pouring a high heat-resistant metal melt (6) in the centrifugal casting mold (10) to form a first high heat-resistant metal layer (2) on the inner wall of the outer support layer (1), obtaining a composite layer tubular mold casting blank; S3, after cleaning the surface of the composite layer tubular mold casting blank, plastic deformation processing is carried out to obtain a composite layer tubular mold forming blank; S4, additive deposition of a second high heat-resistant metal layer (3) on the inner surface of the composite layer tubular mold forming blank. In steps S1 and S2, the pouring package trolley (4) is loaded with a multi-cavity pouring package containing two kinds of metal melts and poured through the rotating table (9), the angle of the multi-cavity pouring package is changed through the rotating table (9), the type of metal sent into the pouring port of the centrifugal casting mold (10) is switched, and the product qualified rate and production efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal casting mold manufacturing technology, and in particular to a manufacturing process for a tubular mold for casting. Background Technology

[0002] The tubular mold used to produce ductile iron pipes is itself a type of cast pipe product, also manufactured using centrifugal casting. This type of casting mold is in direct contact with molten iron at high temperatures and is repeatedly subjected to thermal shock, resulting in a relatively short lifespan. To balance manufacturing costs and service life, the current approach involves composite a layer of high-heat-resistant material, such as heat-resistant mold steel, into the inner layer of the base steel pipe, which serves as the outer support layer. This ensures that the entire tubular mold still primarily uses the outer base steel pipe as its structural support material. Specifically, this method involves first pouring molten metal into the centrifugal casting mold to form the outer support layer, and then pouring high-heat-resistant molten metal onto the inner surface of the outer support layer. The centrifugal force of the mold's rotation promotes the formation of the composite layer.

[0003] When using tubular molds in the above manner, since both the outer support layer and the inner high heat-resistant metal layer are obtained by solidifying molten metal, the high heat-resistant metal melt is injected before the outer support layer material has completely cooled and solidified. The injection of the latter will also have a remelting effect on the former which is about to solidify, which will lead to uneven composite interface of the composite layer. If the inner layer is made thinner in order to save high heat-resistant metal material, it is easy to cause insufficient thickness of the high heat-resistant metal layer material in some areas, or even partial exposure of the outer support layer material, thus failing to play a role in heat protection. On the other hand, since the outer support layer and its internal high heat-resistant metal layer are poured into the centrifugal casting mold in a short period of time, according to the previous operation, two pouring packaging vehicles were required to transfer the outer support layer metal pouring bag and the high heat-resistant metal pouring bag in turn. After completing the procedure of pouring the outer support layer metal molten into the centrifugal casting mold, one vehicle would exit and be replaced by a vehicle to transport the high heat-resistant metal pouring bag to carry out the procedure of pouring the high heat-resistant metal molten into the centrifugal casting mold. The connection was complicated, and sometimes the pouring of the high heat-resistant metal molten was even affected by the long time of the intermediate alternation operation. Summary of the Invention

[0004] To address the problems in the background art, this invention provides a manufacturing process for a tubular mold for casting. On the one hand, a portion of the thickness of the inner working layer in the composite layer structure of the tubular mold is achieved by additive deposition to ensure the minimum thickness of the high heat-resistant material. On the other hand, by developing new workstation tools and pouring ladles, the original multi-metal composite pouring procedure is changed, thereby improving work efficiency and pouring success rate.

[0005] The objective of this invention is achieved through the following technical solutions.

[0006] A manufacturing process for a tubular mold for casting includes the following steps:

[0007] S1, pour the molten metal of the outer support layer into the centrifugal casting mold to form the outer support layer of the tubular mold for casting;

[0008] S2, pour high heat-resistant molten metal into the centrifugal casting mold, and form a first high heat-resistant metal layer on the inner wall of the outer support layer formed in step S1, to obtain a composite layer tube mold casting blank.

[0009] S3, after cleaning the surface of the composite layer tube mold casting blank obtained in step S2, perform plastic deformation processing to obtain the composite layer tube mold forming blank.

[0010] S4, a second high heat-resistant metal layer is additively deposited on the inner surface of the composite layer tube mold blank obtained in step S3 to obtain a tubular mold for casting.

[0011] Preferably, in the manufacturing process of the tubular mold for casting described above, both the first high heat-resistant metal layer and the second high heat-resistant metal layer are made of heat-resistant mold steel.

[0012] Furthermore, in the manufacturing process of the tubular mold for casting described above, step S1 includes:

[0013] S1-1, the casting and packaging transport vehicle carries a multi-cavity casting ladle containing molten metal of the outer support layer and molten metal of high heat resistance through a rotating table and moves to the working area of ​​the centrifugal casting mold. The outer support layer metal pouring pipe of the multi-cavity casting ladle faces the pouring port of the centrifugal casting mold, and the casting and packaging transport vehicle moves towards the pouring port of the centrifugal casting mold, controlling the outer support layer metal pouring pipe to extend into the pouring port of the centrifugal casting mold to a predetermined position;

[0014] S1-2, the pouring valve on the outer support layer metal pouring pipe is opened, allowing the molten metal of the outer support layer to be poured into the rotating centrifugal casting mold to form the outer support layer;

[0015] S1-3, after the pouring of the molten metal of the outer support layer is completed, the pouring and packaging vehicle moves backward, and the pouring pipe of the outer support layer metal is controlled to leave the pouring port of the centrifugal casting mold. The outer support layer continues to solidify under the action of centrifugal force.

[0016] Step S2 includes:

[0017] S2-1, the rotating table of the casting and packaging vehicle rotates, which drives the multi-cavity casting package to rotate, so that the high heat-resistant metal casting pipe of the multi-cavity casting package is oriented towards the pouring port of the centrifugal casting mold. The casting and packaging vehicle runs towards the pouring port of the centrifugal casting mold, and controls the high heat-resistant metal casting pipe to extend into the predetermined position inside the pouring port of the centrifugal casting mold.

[0018] S2-2, the pouring valve on the high heat-resistant metal pouring pipe is opened, allowing the high heat-resistant metal molten liquid to be poured into the rotating centrifugal casting mold, so as to form a first high heat-resistant metal layer on the inner wall of the outer support layer formed in step S1;

[0019] S2-3, after the high heat-resistant metal molten liquid is poured, the pouring and packaging vehicle reverses, controlling the high heat-resistant metal pouring pipe to leave the pouring port of the centrifugal casting mold, and the first high heat-resistant metal layer continues to solidify under the action of centrifugal force.

[0020] Preferably, in the manufacturing process of the tubular mold for casting described above, the plastic deformation process in step S3 includes rolling and flaring.

[0021] Preferably, in the manufacturing process of the tubular mold for casting described above, the additive deposition method in step S4 is powder laser cladding.

[0022] Preferably, in the manufacturing process of the above-mentioned tubular mold for casting, the relationship between the thickness T1 of the outer support layer, the thickness T2 of the first high heat-resistant metal layer, and the thickness T3 of the second high heat-resistant metal layer is: T1≥T2>T3.

[0023] Preferably, in the manufacturing process of the above-mentioned tubular mold for casting, in step S4, before additively depositing a second high heat-resistant metal layer on the inner surface of the composite layer tubular mold forming blank, the inner surface of the composite layer tubular mold forming blank is cleaned.

[0024] Preferably, in the manufacturing process of the tubular mold for casting described above, the operation of the casting and packaging vehicle in the working area of ​​the centrifugal casting mold is carried out on a limiting guide rail.

[0025] Preferably, in the manufacturing process of the above-mentioned tubular mold for casting, the multi-cavity casting ladle has only two cavities, which respectively hold the outer support layer molten metal and the high heat-resistant molten metal. In step S2-1, the rotary table drives the multi-cavity casting ladle to rotate 180°.

[0026] Preferably, in the manufacturing process of the tubular mold for casting described above, each cavity of the multi-cavity casting ladle contains molten metal for a single casting.

[0027] The beneficial effects of this invention are as follows:

[0028] The manufacturing process of the tubular mold for casting provided by the present invention achieves a portion of the thickness of the inner working layer in the composite layer structure of the tubular mold by additive deposition, ensuring the minimum thickness of the high heat-resistant material. The first high heat-resistant metal layer is manufactured quickly and at low cost by casting, and the second high heat-resistant metal layer is composited into the inner layer of the first high heat-resistant metal layer by additive deposition. The thickness is uniform and can fully cover the inner layer of the mold, so that even if the thickness of the first high heat-resistant metal layer is uneven, the inner layer of the mold will not be locally unprotected.

[0029] The manufacturing process of the tubular mold for casting provided by this invention involves using a casting packaging vehicle with a rotary table to load a multi-cavity casting ladle containing two molten metals for casting. The rotary table is used to change the angle of the multi-cavity casting ladle and switch the type of metal sent into the pouring port of the centrifugal casting mold. This innovative operation mode avoids the impact of excessively long intermediate operation time when alternating between the two molten metals on the casting of high heat-resistant molten metal, thereby improving both product qualification rate and production efficiency. Attached Figure Description

[0030] The advantages and features of the present invention will become clear to those skilled in the art from the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. In the drawings:

[0031] Figure 1 This is a schematic diagram of the composite layer tubular mold casting blank structure prepared by step S2 in the manufacturing process of the tubular mold for casting of the present invention.

[0032] Figure 2 This is a schematic diagram of the composite layer tubular mold forming blank structure prepared by step S3 in the manufacturing process of the tubular mold for casting of the present invention.

[0033] Figure 3 This is a schematic diagram of the structure of the casting tubular mold prepared by step S4 in the manufacturing process of the casting tubular mold of the present invention.

[0034] Figure 4 This is a schematic diagram of the tooling equipment and mold structure used in the manufacturing process of the tubular mold for casting of the present invention.

[0035] Figure 5 This is an exploded view of step S1 in the manufacturing process of the tubular mold for casting of the present invention.

[0036] Figure 6 This is an exploded view of step S2 in the manufacturing process of the tubular mold for casting of the present invention.

[0037] The attached diagram labels represent components:

[0038] 1. Outer support layer, 2. First high heat-resistant metal layer, 3. Second high heat-resistant metal layer, 4. Casting and packaging transport vehicle, 5. Outer support layer molten metal, 6. High heat-resistant metal molten metal, 7. Outer support layer metal casting pipe, 8. High heat-resistant metal casting pipe, 9. Rotary table, 10. Centrifugal casting mold, 11. Traveling wheel, 12. Limiting guide rail. Detailed Implementation

[0039] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of this disclosure and to fully convey the scope of this disclosure to those skilled in the art. This disclosure can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0040] Example 1

[0041] See Figures 1 to 6 This embodiment proposes a manufacturing process for a tubular mold for casting, including the following steps:

[0042] S1, pour the molten metal 5 of the outer support layer into the centrifugal casting mold 10 to form the outer support layer 1 of the tubular mold for casting.

[0043] S2, pour high heat-resistant molten metal 6 into centrifugal casting mold 10, and form a first high heat-resistant metal layer 2 on the inner wall of the outer support layer 1 formed in step S1, to obtain a composite layer tube mold casting blank.

[0044] S3. After cleaning the surface of the composite layer tube mold casting blank obtained in step S2, perform plastic deformation processing to obtain the composite layer tube mold forming blank.

[0045] The plastic deformation processing in this step mainly refers to the thickness rolling and flaring of the composite layer tube mold casting blank, to obtain, for example... Figure 2 The end portion that meets the desired outer contour shape of the spigot end during ductile iron pipe production is formed by plastic deformation, which is the primary forming method in this step. However, it is not excluded that machining can be used as an auxiliary process before, during, or after plastic deformation to obtain certain design dimensions or structural features.

[0046] S4, a second high heat-resistant metal layer 3 is additively deposited on the inner surface of the composite layer tube mold blank obtained in step S3 to obtain a tubular mold for casting.

[0047] Before the additive deposition of the second high heat-resistant metal layer 3 on the inner surface of the composite layer tube mold forming blank in this step, the inner surface of the composite layer tube mold forming blank can also be cleaned again. Multiple chemical cleanings can be performed to remove oil stains brought in during plastic deformation processing.

[0048] The most suitable method for additive deposition in the inner layer of a tubular mold is powder laser cladding deposition. This invention uses a mature laser synchronous powder feeding process to perform the above-mentioned additive deposition operation. In this process, the composite layer tubular mold blank can be installed on a rotary table, and the laser synchronous powder feeding cladding head can be inserted into the composite layer tubular mold blank through a horizontal working arm. While the composite layer tubular mold blank is rotating, the laser synchronous powder feeding cladding head can also move along the axial direction of the composite layer tubular mold blank, thereby performing additive deposition of the second high heat-resistant metal layer 3.

[0049] According to the process provided in this embodiment, the "high heat resistance" in the materials of the first high heat-resistant metal layer 2 and the second high heat-resistant metal layer 3 mainly refers to the ordinary heat-resistant material used to prepare the outer support layer 1. It is also related to the castings prepared by the tubular mold. For example, when preparing a tubular mold for casting ductile iron pipe castings, the first high heat-resistant metal layer 2 and the second high heat-resistant metal layer 3 can both be heat-resistant mold steel materials, which have better performance than the ordinary heat-resistant steel used to prepare the outer support layer 1.

[0050] In addition, the fact that the first high heat-resistant metal layer 2 and the second high heat-resistant metal layer 3 are made of the same material means that the material type and grade are the same. Depending on the source of the material, the elements or raw material composition may be different. Alternatively, without changing the material type, some of the elements or raw material composition can be artificially adjusted.

[0051] The manufacturing process of the tubular mold for casting provided in this embodiment involves the low-cost and rapid manufacturing of the first high heat-resistant metal layer 2 by casting, and the second high heat-resistant metal layer 3 by additive deposition as an inner layer of the first high heat-resistant metal layer 2. The thickness is uniform and it can fully cover the inner layer of the mold. In this way, by using additive deposition to achieve a portion of the thickness of the inner working layer in the composite layer structure of the tubular mold, the minimum thickness of the high heat-resistant material is guaranteed. Even if the thickness of the first high heat-resistant metal layer 2 is uneven, the inner layer of the mold will not be locally unprotected. This allows the first high heat-resistant metal layer 2 to have a relatively thin thickness not exceeding that of the outer support layer 1. Based on this manufacturing concept, during the product design stage, it is analyzed and determined that the thickness T1 of the outer support layer 1, the thickness T2 of the first high heat-resistant metal layer 2, and the thickness T3 of the second high heat-resistant metal layer 3 should satisfy the following relationship: T1≥T2>T3. In practical applications, the thickness of the outer support layer 1 is generally greater than the sum of the thicknesses of the first high heat-resistant metal layer 2 and the second high heat-resistant metal layer 3. Specifically, the thickness of the outer support layer 1 is generally not less than 40 mm, the thickness of the first high heat-resistant metal layer 2 is generally not less than 22 mm, and the thickness of the second high heat-resistant metal layer 3 is generally not less than 6 mm. In this embodiment, the second high heat-resistant metal layer 3 is additively deposited in step S4 only after the plastic deformation process in step S3. A significant advantage is that, during the plastic deformation process, the composite layer mold casting blank undergoes plastic deformation to obtain the composite layer mold forming blank. Besides the interface inconsistencies easily caused during composite casting, plastic deformation further increases the likelihood of the first high heat-resistant metal layer 2 becoming thinner and being displaced by the outer support layer material. Additively depositing the second high heat-resistant metal layer 3 in step S4 after the plastic deformation process in step S3, compared to additively depositing the second high heat-resistant metal layer 3 before the plastic deformation process, can effectively protect the relatively thin second high heat-resistant metal layer 3 from damage caused by plastic deformation. The molds manufactured using the process described in this embodiment for producing ductile iron pipes can increase single-mold output by more than 15% and have a longer service life.

[0052] The following mainly combines Figure 5 and Figure 6 The composite centrifugal casting process in steps S1 and S2 of this embodiment will be described to demonstrate the main advantages of the manufacturing process of the present invention in the casting procedure. Specifically, step S1 includes:

[0053] S1-1, see S1-1. Figure 5In step (a), the casting and packaging transport vehicle 4, carrying a multi-cavity casting ladle containing an outer support layer molten metal 5 and a high heat-resistant molten metal 6, moves to the working area of ​​the centrifugal casting mold 10 via a rotary table 9. The outer support layer molten metal pouring pipe 7 of the multi-cavity casting ladle faces the pouring port of the centrifugal casting mold 10, and the casting and packaging transport vehicle 4 moves towards the pouring port of the centrifugal casting mold 10, controlling the outer support layer molten metal pouring pipe 7 to extend into the pouring port of the centrifugal casting mold 10 to a predetermined position.

[0054] S1-2, see S1-2. Figure 5 In step (b), the pouring valve on the outer support layer metal pouring pipe 7 is opened, allowing the outer support layer metal molten 5 to be poured into the rotating centrifugal casting mold 10 to form the outer support layer 1.

[0055] The multi-cavity casting ladle illustrated in this embodiment contains only molten metal for a single pour in each cavity. Therefore... Figure 5 The cavity containing the molten metal 5 with the outer support layer shown in Figure (b) has been emptied. In multi-mold production with the necessary conditions, each cavity can also contain molten metal for casting multiple products. The amount of molten metal cast in each cavity can be controlled by combining flow monitoring or weighing and through the casting valve. For example, the weight can be measured by detecting the pressure below the rotary table 9, thereby controlling the opening and closing of the casting valve.

[0056] S1-3, see S1-3. Figure 5 In step (c), after the pouring of the outer support layer molten metal 5 is completed, the pouring and packaging vehicle 4 moves backward, controlling the outer support layer molten metal pouring pipe 7 to leave the pouring port of the centrifugal casting mold 10, and the outer support layer 1 continues to solidify under the action of centrifugal force.

[0057] Step S2 includes:

[0058] S2-1, see S2-1. Figure 6 In the procedure shown in (a) to (b), the rotary table 9 of the casting and packaging vehicle 4 rotates, driving the multi-cavity casting ladle to rotate, so that the high heat-resistant metal casting pipe 8 of the multi-cavity casting ladle faces the pouring port of the centrifugal casting mold 10. Figure 6 As shown in (a), the casting and packaging transport vehicle 4 moves towards the pouring gate of the centrifugal casting mold 10, controlling the high heat-resistant metal pouring pipe 8 to extend into the predetermined position inside the pouring gate of the centrifugal casting mold 10. Figure 6 (as shown in (b)).

[0059] The multi-cavity casting ladle illustrated in this embodiment has two cavities, containing the outer support layer molten metal 5 and the high heat-resistant molten metal 6 respectively. Therefore, in this step, the rotary table 9 drives the multi-cavity casting ladle to rotate 180° so that the high heat-resistant metal casting pipe 8 is oriented towards the pouring port of the centrifugal casting mold 10. In conceivable modifications, the multi-cavity casting ladle may have more than two cavities, or even if there are only two cavities, the angle between the two casting pipes may not necessarily be 180°.

[0060] S2-2, see S2-2. Figure 6 In step (c), the pouring valve on the high heat-resistant metal pouring pipe 8 is opened, allowing the high heat-resistant metal molten liquid 6 to be poured into the rotating centrifugal casting mold 10, so as to form the first high heat-resistant metal layer 2 on the inner wall of the outer support layer 1 formed in step S1.

[0061] S2-3, after the high heat-resistant metal melt 6 is poured, the pouring and packaging transport vehicle 4 moves backward, controlling the high heat-resistant metal pouring pipe 8 to leave the pouring port of the centrifugal casting mold 10, and the first high heat-resistant metal layer 2 continues to solidify under the action of centrifugal force.

[0062] from Figures 4 to 6 As can be seen, the operation of the casting and packaging transport vehicle 4 in the working area of ​​the centrifugal casting mold 10 is carried out on the limiting guide rail 12. The path of the traveling wheel 11 can be restricted by the limiting guide rail 12 to prevent the movement from deviating and becoming inaccurate.

[0063] In this embodiment, the above-mentioned process uses a casting and packaging vehicle 4 with a rotary table 9 to load a multi-cavity casting ladle containing two kinds of molten metal for casting. The rotary table 9 is used to change the angle of the multi-cavity casting ladle and switch the type of metal sent into the pouring port of the centrifugal casting mold 10. This innovative operation mode avoids the impact of the long intermediate connection operation time when the two kinds of molten metal are alternately poured on the pouring of the high heat-resistant molten metal 6. The product qualification rate and production efficiency are improved.

[0064] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A manufacturing process of a tubular mold for casting, characterized by, The method comprises the following steps: S1, pouring an outer support layer metal melt in a centrifugal casting mold to form an outer support layer of a tubular mold for casting; S2, pouring a high heat-resistant metal melt in the centrifugal casting mold to form a first high heat-resistant metal layer on the inner wall of the outer support layer formed in step S1, and obtaining a composite layer pipe mold casting blank; S3, after the surface of the composite layer pipe mold casting blank obtained in step S2 is cleaned, plastic deformation processing is performed to obtain a composite layer pipe mold forming blank; S4, a second high heat-resistant metal layer is additively deposited on the inner surface of the composite layer pipe mold forming blank obtained in step S3 in a powder laser cladding manner to obtain a tubular mold for casting; The first high heat-resistant metal layer and the second high heat-resistant metal layer are both heat-resistant mold steel materials, and the thickness of the outer support layer is greater than the sum of the thicknesses of the first high heat-resistant metal layer and the second high heat-resistant metal layer; Step S1 comprises: S1-1, a pouring package vehicle carrying a multi-cavity pouring package containing the outer support layer metal melt and the high heat-resistant metal melt is driven by a rotating table to a working area of the centrifugal casting mold, the outer support layer metal pouring pipe of the multi-cavity pouring package faces the pouring opening direction of the centrifugal casting mold, the pouring package vehicle runs towards the pouring opening of the centrifugal casting mold, and the outer support layer metal pouring pipe is controlled to extend to a predetermined position in the pouring opening of the centrifugal casting mold; S1-2, a pouring valve on the outer support layer metal pouring pipe is opened to pour the outer support layer metal melt into the rotating centrifugal casting mold to form the outer support layer; S1-3, after the pouring of the outer support layer metal melt is completed, the pouring package vehicle retreats, the outer support layer metal pouring pipe is controlled to leave the pouring opening of the centrifugal casting mold, and the outer support layer continues to solidify under the action of centrifugal force; Step S2 comprises: S2-1, the rotating table of the pouring package vehicle is rotated to rotate the multi-cavity pouring package, the high heat-resistant metal pouring pipe of the multi-cavity pouring package faces the pouring opening direction of the centrifugal casting mold, the pouring package vehicle runs towards the pouring opening of the centrifugal casting mold, and the high heat-resistant metal pouring pipe is controlled to extend to a predetermined position in the pouring opening of the centrifugal casting mold; S2-2, a pouring valve on the high heat-resistant metal pouring pipe is opened to pour the high heat-resistant metal melt into the rotating centrifugal casting mold to form the first high heat-resistant metal layer on the inner wall of the outer support layer formed in step S1; S2-3, after the pouring of the high heat-resistant metal melt is completed, the pouring package vehicle retreats, the high heat-resistant metal pouring pipe is controlled to leave the pouring opening of the centrifugal casting mold, and the first high heat-resistant metal layer continues to solidify under the action of centrifugal force; The running of the pouring package vehicle in the working area of the centrifugal casting mold is performed on a limiting guide rail.

2. The manufacturing process of a tubular mold for casting according to claim 1, wherein, The plastic deformation processing of step S3 comprises rolling processing and flaring processing.

3. The manufacturing process of a tubular mold for casting according to claim 1, wherein, The additive deposition method of step S4 is a powder laser cladding method.

4. The manufacturing process of a tubular mold for casting according to claim 1, wherein In step S4, before the second high heat-resistant metal layer is additively deposited on the inner surface of the composite layer pipe mold forming blank, the inner surface of the composite layer pipe mold forming blank is surface cleaned.

5. The manufacturing process of a tubular mold for casting according to claim 1, wherein The multi-cavity pouring package only has two cavities containing the outer support layer metal melt and the high heat-resistant metal melt, respectively, and in step S2-1, the rotating table rotates the multi-cavity pouring package by 180°.

6. The manufacturing process of a tubular mold for casting according to claim 5, wherein Each of the plurality of cavities of the multi-cavity pouring ladle contains a metal melt for one pouring.

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