Casting method and casting

Abstract

The invention provides a casting method and a casting, and the casting method comprises the following steps: dividing to form different temperature areas according to the predicted surface temperature distribution of the casting to be produced at a set moment; and according to the temperature areas, the sand mold assembly is prepared and formed. The sand mold assembly comprises a shell mold structure and a cooling part, a casting cavity is formed in the center of the shell mold structure, a plurality of hollowed-out areas corresponding to the temperature areas are formed on the outer side of the shell mold structure, and the cooling part is arranged in the selected hollowed-out area. And determining the required water absorption amount of the cooling part. And water is injected into the corresponding hollow areas according to the required water absorption amount of each cooling part. And a melt is poured into the casting cavity, and a casting is formed after cooling. In this way, the casting can be cooled according to the set cooling sequence, and therefore the phenomenon that the top of the casting is rapidly cooled, and consequently a melt pouring channel is blocked can be prevented.

Description

Technical Field

[0001] The present disclosure relates to the field of casting, and in particular to a casting method and a casting. Background Art

[0002] Sand casting is a widely used casting process that forms castings by pouring molten metal into a sand mold and cooling and solidifying it. The cooling capacity of the sand mold is low, resulting in coarse grains in the obtained castings and relatively poor performance of the castings. In order to improve the performance of the castings, some sand castings place chillers in the sand mold for local cooling control. The chillers are wrapped inside the sand mold. In this way, the cooling rate of each position of the casting is uncontrollable during the cooling process, and the top of the casting may cool rapidly, resulting in blockage of the channel for pouring the melt. Summary of the invention

[0003] The present disclosure provides a casting method and a casting to solve at least part of the problems in the related art.

[0004] The present disclosure provides a casting method, comprising:

[0005] Different temperature zones are formed according to the predicted temperature distribution on the surface of the casting to be produced at a set time;

[0006] According to each of the temperature zones, a sand mold assembly is prepared; the sand mold assembly comprises a shell structure and a cooling portion, a casting cavity is formed in the center of the shell structure, and a plurality of hollow areas are formed on the outer side corresponding to the temperature zones, wherein the cooling portion is provided in a selected hollow area;

[0007] Determining the required water absorption of the cooling unit;

[0008] According to the required water absorption amount of each cooling part, water is injected into the corresponding hollow area; and

[0009] The melt is poured into the casting cavity and the casting is formed after cooling.

[0010] Further, the determining the required water absorption amount of the cooling unit includes:

[0011] Determine the standard temperature of each temperature zone at the set time according to the number of divisions of the temperature zone during prediction, the lowest temperature and the highest temperature of the surface of the casting to be produced at the set time;

[0012] Determine a maximum difference among the obtained multiple differences according to the difference between the standard temperature of each temperature zone at the set time and the temperature of each grid unit on the casting corresponding to the temperature zone at the set time;

[0013] The required water absorption of the cooling part in the hollow area corresponding to the temperature zone is determined according to the difference between the standard temperature of each temperature zone at the set time and the temperature of each grid unit on the casting corresponding to the temperature zone at the set time and the cooling intensity coefficient.

[0014] Further, the method of determining the standard temperature of each temperature zone at the set time according to the number of divisions of the temperature zone during prediction, the minimum temperature and the maximum temperature of the surface of the casting to be produced at the set time, comprises:

[0015] The standard temperature of each temperature zone at the set time is determined by the following relationship:

[0016]

[0017] is the standard temperature of each temperature zone of number a at the set time, T min is the minimum temperature of the surface of the casting to be produced at the set time, T max is the maximum temperature of the surface of the casting to be produced at the set time, a is the number of the temperature zone formed by dividing the casting to be produced from bottom to top in the height direction, and b is the number of divisions of the temperature zone.

[0018] Further, determining the maximum difference among the obtained multiple differences according to the difference between the standard temperature of each temperature zone at the set time and the temperature of each grid unit on the casting corresponding to the temperature zone at the set time, comprises:

[0019] The maximum difference among the obtained multiple differences is determined by the following relationship:

[0020]

[0021] ΔT max is the maximum difference among the multiple differences obtained, T i,j,k For each temperature zone numbered a, the temperature of the grid unit on the casting whose coordinates are represented by (i, j, k) at a set time.

[0022] Further, the method of determining the required water absorption of the cooling portion in the hollow area corresponding to the temperature zone according to the standard temperature of each temperature zone at the set time and the difference between the temperature of each grid unit on the casting corresponding to the temperature zone at the set time and the cooling intensity coefficient comprises:

[0023] The required water absorption amount of the cooling part in the hollow area corresponding to the temperature area numbered a is determined by the following relationship:

[0024]

[0025] m w is the required water absorption of the cooling part in the hollow area corresponding to the temperature area, c is the cooling intensity coefficient, where, N is the total number of grid cells on the casting corresponding to the temperature zone numbered a, m w_max It is the maximum water absorption of the cooling part in a hollow area.

[0026] Furthermore, the step of injecting water into the corresponding hollow area according to the required water absorption amount of each cooling part includes:

[0027] Determine the required water injection time corresponding to the required water absorption amount according to the corresponding relationship between the water absorption amount and the water injection time under different types of the cooling parts;

[0028] Water is injected into the corresponding hollow area according to the required water injection time.

[0029] Furthermore, before pouring the melt into the casting cavity and forming the casting after cooling, the process further comprises:

[0030] The water-filled sand mold assembly is placed for a set period of time.

[0031] Furthermore, the shell-type structure includes a main body and a plurality of protruding structures protruding from the outer side of the main body, the plurality of protruding structures are arranged at intervals along the height direction of the main body, and the hollow area is formed between the main body and two adjacent protruding structures.

[0032] Furthermore, the thickness of the protruding structure is greater than or equal to 5 mm; and / or

[0033] The length of the protruding structure extending from the outer side of the main body is greater than or equal to 30 mm; and / or

[0034] The ratio of the distance between two adjacent protrusion structures away from the side of the main body to the length of the protrusion structure extending from the outer side of the main body is less than or equal to 3; and / or

[0035] The angle between the extending direction of the protruding structure and the horizontal direction is greater than or equal to -10°.

[0036] The present disclosure provides a casting, which is prepared by the casting method described in any of the above embodiments.

[0037] The disclosed embodiment provides a casting method, which can divide and form different temperature zones according to the predicted temperature distribution of the surface of the casting to be produced at a set time. The cooling rate is controlled by the contents of the hollow areas formed by the sand mold component corresponding to the temperature zones, wherein a cooling part is provided in the selected hollow area, which can accelerate the cooling rate of the position with higher surface temperature of the casting. And by determining the required water absorption of the cooling part, the casting can be cooled according to the set cooling sequence, thereby preventing the top of the casting from cooling quickly and causing the channel of the pouring melt to be blocked.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0040] Figure 1 Shown is a schematic plan view of a sand mold assembly according to one embodiment of the present disclosure;

[0041] Figure 2 Shown is a flow chart of a casting method according to an embodiment of the present disclosure;

[0042] Figure 3 Shown Figure 2 A further flow chart of the casting method shown;

[0043] Figure 4 Shown Figure 2 A further flow diagram of the casting method is shown. DETAILED DESCRIPTION

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0045] The casting method and castings of the embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0046] See also Figure 1 and Figure 2As shown, the embodiment of the present disclosure provides a casting method, which can be applied to the casting of metals such as iron, steel, nonferrous metals, etc. The casting method may include steps S101 to S105.

[0047] In step S101, different temperature zones are formed according to the predicted temperature distribution on the surface of the casting to be produced at the set time. The range of the set time can be between 1min and 30min. A temperature distribution model of the surface of the casting to be produced at the set time can be established by software, and different temperature zones are formed according to the temperature distribution model. In one embodiment, the temperature interval value is determined according to the predicted temperature distribution on the surface of the casting to be produced at the set time. According to the determined temperature interval value, different temperature zones are formed. Among them, there are multiple temperature nodes in a temperature zone, and the temperature difference between each temperature node in the same temperature zone is less than or equal to the temperature interval value. Different castings to be produced have different temperature distributions on the surface at the set time, and the temperature zones formed by the division are different, so that the casting method can be applied to the cooling process of different castings.

[0048] In step S102, a sand mold component 10 is prepared according to each temperature zone. The sand mold component 10 includes a shell structure 11 and a cooling part 12. The cooling part 12 can be one of loose sand and hydrogel, and multiple cooling parts 12 can include at least one of loose sand and hydrogel. The cooling part 12 using the above material has a large water absorption capacity and a good cooling effect. The cooling part 12 can also use other cooling media, which is not limited by the present disclosure. Cooling is performed using the cooling part 12, so there is no need to add additional cooling structures such as cold iron, and the structure is simple. In one embodiment, the shell structure 11 can be a mixture of sand and adhesive, and the cooling part 12 can be loose sand (i.e., sand without adding adhesive), so that the sand mold component 10 can be directly prepared by 3D printing technology, and the preparation method is simple. A casting cavity 13 is formed in the center of the shell structure 11, and multiple hollow areas 14 are formed on the outside corresponding to the temperature zone. The hollow area 14 corresponds to the temperature zone. Among them, one hollow area 14 can correspond to one temperature zone, and multiple hollow areas 14 can correspond to one temperature zone. Each hollow area 14 can be used as a unit for controlling cooling. A cooling part 12 is provided in the selected hollow area 14. The selected hollow area 14 can be the entire hollow area 14 or a part of the hollow area 14. The types of cooling parts 12 provided in different selected hollow areas 14 can be the same, such as loose sand is provided in all selected hollow areas 14. The types of cooling parts 12 provided in different selected hollow areas 14 can also be different, such as loose sand is provided in some selected hollow areas 14, and hydrogel is provided in some selected hollow areas 14. The unselected hollow areas 14 can be vacant or provided with a heat preservation sleeve. In one embodiment, a hollow area provided with a cooling part 12 can be selected according to each temperature zone. For example, a cooling part 12 is provided in the hollow area 14 corresponding to the high temperature zone on the surface of the casting to accelerate the cooling rate. The hollow area 14 corresponding to the low temperature zone on the surface of the casting is vacant; or a heat preservation sleeve is provided in the hollow area 14 corresponding to the low temperature zone on the surface of the casting to reduce the cooling rate. When the shell structure 11 is a mixture of sand and adhesive, and the cooling part 12 is loose sand, after preparing the sand mold component 10 by 3D printing technology, it is necessary to clean the loose sand in the casting cavity 13 and retain the loose sand in the selected hollow area 14. The water absorption characteristics of the loose sand that has not been removed in the selected hollow area 14 can be used to regulate the cooling rate at different positions during the cooling process.

[0049] In one embodiment, the shell structure 11 includes a main body 15 and a plurality of protruding structures 16 protruding from the outer side of the main body 15. The thickness of the main body 15 can be set according to each temperature zone. A casting cavity 13 is formed in the center of the main body 15, and the casting cavity 13 is used to accommodate the melt. The protruding structure 16 is protruding from the outer side of the main body 15. The protruding structure 16 can be a plate-shaped, and a reinforcing rib plate can be used. The protruding structure 16 can be a straight plate or a bent plate. Figure 1 As shown in , the raised structure 16 adopted at the upper end of the main body 15 is a straight plate, and the raised structure 16 adopted at the lower end of the main body 15 is a bent plate. A plurality of raised structures 16 are arranged at intervals along the height direction of the main body 15, and the main body 15 and two adjacent raised structures 16 enclose a hollow area 14, which is formed by the main body 15 and two adjacent raised structures 16, so that the method of forming the hollow area 14 is simple and has high feasibility.

[0050] In one embodiment, the thickness e of the protruding structure 16 is greater than or equal to 5 mm, that is, e≥5 mm. In this way, the protruding structure 16 has high strength and can better support the cooling portion 12.

[0051] In one embodiment, the length d of the protruding structure 16 extending from the outer side of the main body 15 is greater than or equal to 30 mm, that is, d≥30 mm. The capacity of the hollow area 14 formed in this way is more suitable and can accommodate more cooling parts 12.

[0052] In one embodiment, the ratio of the distance t between two adjacent protrusion structures 16 away from the side of the main body 15 to the length d of the protrusion structure 16 extending from the outer side of the main body 15 is less than or equal to 3, that is, The distance t between two adjacent protrusion structures 16 away from the main body 15 is the equivalent diameter of the hollow area 14. The ratio of the distance t to the length d is less than or equal to 3, so that the cooling portion 12 can be prevented from falling off from the hollow area 14.

[0053] In one embodiment, the angle α between the extension direction of the protrusion structure 16 and the horizontal direction is greater than or equal to -10°, that is, α≥-10°. In this way, the protrusion structure 16 has a suitable inclination angle, which can prevent the cooling portion 12 from falling off from the hollow area 14 due to gravity.

[0054] In step S103, the required water absorption of the cooling part 12 is determined. The required water absorption of the cooling part 12 does not exceed its saturated water absorption, so that the phenomenon of excessive water content of the shell structure 11 caused by dripping or seeping of water on the surface of the cooling part 12 can be avoided, and defects such as pores can be further prevented from being generated in the casting. The required water absorption of the cooling part 12 can be determined according to the temperature (temperature distribution and temperature range) of the casting to be produced and the set cooling sequence required for the casting to be produced. The set cooling sequence can refer to sequential cooling or simultaneous cooling.

[0055] In step S104, water is injected into the corresponding hollow area 14 according to the required water absorption amount of each cooling part 12. Water can be injected into the corresponding hollow area 14 by means of a needle, a dropper, a pipe, a nozzle, etc. Among them, when the cooling part 12 is loose sand, the above water injection method can make the loose sand absorb water evenly through capillary action. And when water is injected into the corresponding hollow area 14, the water can be absorbed by the cooling part 12, so that the contact between the melt poured in the casting cavity 13 and the water can be avoided, and the operation is safe and reliable.

[0056] In step S105, a melt is poured into the casting cavity 13, and a casting is formed after cooling. The melt can be a liquid after the metal such as iron, steel, non-ferrous metals, etc. is melted. The molten metal can be cooled in the casting cavity 13 to form a casting. During the cooling process, the heat will first be conducted to the shell structure 11, and then transferred to the outside through the contents in the hollow area 14. The insulation sleeve in the unselected hollow area 14 can reduce the cooling rate. The cooling part 12 in the selected hollow area 14 can speed up the cooling rate, and the cooling rate is related to the water absorption of the cooling part 12. Among them, the higher the water absorption of the cooling part 12, the faster the cooling rate.

[0057] The disclosed embodiment provides a casting method, which can divide and form different temperature zones according to the predicted temperature distribution of the surface of the casting to be produced at a set time. The cooling rate is controlled by the content of the hollow area 14 formed by the sand mold assembly 10 corresponding to the temperature zone, wherein a cooling part 12 is provided in the selected hollow area 14, which can accelerate the cooling rate of the position with higher surface temperature of the casting. And by determining the required water absorption of the cooling part 12, the casting can be cooled according to the set cooling sequence, thereby preventing the top of the casting from cooling rapidly and causing the channel of the pouring melt to be blocked. At the same time, the rapid cooling of the casting can be achieved, the residence time of the casting in the sand mold assembly 10 is shortened, the production efficiency is improved, and the thermal stress of the casting is reduced, thereby reducing the risk of deformation and cracks and improving the performance of the casting.

[0058] In one embodiment, before the melt is poured into the casting cavity 13 and the casting is formed after cooling, the method further includes: placing the water-injected sand mold assembly 10 for a set time. The set time is less than or equal to seven days, so that the water in the cooling part 12 can be prevented from penetrating into the shell structure 11, and further, defects such as pores can be prevented from being generated in the casting. Placing the water-injected sand mold assembly 10 for a set time is conducive to sufficient water absorption by the cooling part 12, thereby ensuring the cooling effect of the cooling part 12.

[0059] See also Figure 3 As shown, in one embodiment, determining the required water absorption amount of the cooling unit 12 may include steps S201 to S203.

[0060] In step S201, the standard temperature of each temperature zone at a set time is determined according to the number of temperature zones divided during prediction, the minimum temperature and the maximum temperature of the surface of the casting to be produced at the set time.

[0061] In step S202, the maximum difference among the obtained multiple differences is determined according to the difference between the standard temperature of each temperature zone at the set time and the temperature of each grid unit on the casting corresponding to the temperature zone at the set time. Wherein, each temperature zone contains multiple grid units divided and formed on the casting to be produced. According to the difference between the standard temperature of each temperature zone at the set time and the temperature of each grid unit in the temperature zone at the set time, the maximum difference among the obtained multiple differences is determined. For example: at the set time, the first difference between the standard temperature of the first temperature zone and the temperature of the first grid unit in the first temperature zone at the set time, the second difference between the standard temperature of the first temperature zone and the temperature of the second grid unit in the first temperature zone, ..., the Mth difference between the standard temperature of the first temperature zone and the temperature of the Mth grid unit in the first temperature zone. Among the multiple differences obtained above, the maximum difference is determined, that is, the maximum difference among the first difference, the second difference, ..., and the Mth difference. The second temperature zone, ..., and the Wth temperature zone determine the maximum difference among the obtained multiple differences as described above.

[0062] In step S203, the required water absorption of the cooling part in the hollow area corresponding to the temperature area is determined according to the difference between the standard temperature of each temperature area at the set time and the temperature of each grid unit on the casting corresponding to the temperature area at the set time, the maximum difference and the cooling intensity coefficient. The method of obtaining the required water absorption is simple and easy to operate.

[0063] In one embodiment, according to the number of temperature zones divided during prediction, the minimum temperature and the maximum temperature of the surface of the casting to be produced at the set time, the standard temperature of each temperature zone at the set time is determined, including:

[0064] The standard temperature of each temperature zone at the set time is determined by the following relationship:

[0065]

[0066] is the standard temperature of the temperature zone numbered a at the set time, T min is the minimum surface temperature of the casting to be produced at the set time, T max is the highest surface temperature of the casting to be produced at the set time, a is the number of the temperature zone formed by dividing the casting to be produced from bottom to top in the height direction, and b is the number of divided temperature zones. Among them, a is selected from 1, 2, 3, ..., b in sequence to determine the standard temperature of each temperature zone at the set time.

[0067] In one embodiment, according to the difference between the standard temperature of each temperature zone at a set time and the temperature of each grid unit on the casting corresponding to the temperature zone at the set time, determining the maximum difference among the obtained multiple differences includes:

[0068] The maximum difference among the obtained multiple differences is determined by the following relationship:

[0069]

[0070] ΔT max is the maximum difference among the multiple differences obtained, T i,j,k The temperature of the grid unit whose coordinates on the casting are represented by (i, j, k) corresponding to the temperature zone numbered a at the set time.

[0071] In one embodiment, the required water absorption of the cooling portion in the hollow area corresponding to the temperature zone is determined according to the difference between the standard temperature of each temperature zone at a set time and the temperature of each grid unit on the casting corresponding to the temperature zone at a set time and the cooling intensity coefficient, including:

[0072] The required water absorption of the cooling part in the hollow area corresponding to the temperature area numbered a is determined by the following relationship:

[0073]

[0074] m w is the required water absorption of the cooling part in the hollow area corresponding to the temperature area, c is the cooling intensity coefficient, where, N is the total number of grid cells on the casting corresponding to the temperature zone numbered a, m w_max It is the maximum water absorption of the cooling part in a hollow area.

[0075] See also Figure 4As shown, in one embodiment, according to the required water absorption amount of each cooling part 12, water is injected into the corresponding hollow area 14, which may include steps S301-S302.

[0076] In step S301, the required water injection duration corresponding to the required water absorption is determined according to the correspondence between the water absorption amount and the water injection duration under different types of cooling parts 12. The water absorption amount and the water injection duration of the same type of cooling parts 12 have a fixed correspondence, and the required water injection duration corresponding to the required water absorption amount can be compared and confirmed in the correspondence.

[0077] In step S302, water is injected into the corresponding hollow area 14 according to the required water injection time. In this way, it can be determined whether the cooling part 12 reaches the required water absorption by controlling the length of the water injection time. This method of determining whether the cooling part 12 reaches the required water absorption is simple and easy to implement.

[0078] The present disclosure provides a casting, which is prepared by the above casting method. It should be noted that the description of the casting method in the above embodiments and implementations is also applicable to the casting in the embodiment of the present disclosure.

[0079] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A casting method, characterized in that: include: Different temperature zones are formed according to the predicted temperature distribution on the surface of the casting to be produced at a set time; According to each of the temperature zones, a sand mold assembly is prepared; the sand mold assembly comprises a shell structure and a cooling portion, a casting cavity is formed in the center of the shell structure, and a plurality of hollow areas are formed on the outer side corresponding to the temperature zones, wherein the cooling portion is provided in a selected hollow area; Determining the required water absorption of the cooling unit; According to the required water absorption amount of each cooling part, water is injected into the corresponding hollow area; and The melt is poured into the casting cavity and the casting is formed after cooling.

2. The casting method according to claim 1, characterized in that: The step of determining the required water absorption amount of the cooling unit includes: Determine the standard temperature of each temperature zone at the set time according to the number of divisions of the temperature zone during prediction, the lowest temperature and the highest temperature of the surface of the casting to be produced at the set time; Determine a maximum difference among the obtained multiple differences according to the difference between the standard temperature of each temperature zone at the set time and the temperature of each grid unit on the casting corresponding to the temperature zone at the set time; The required water absorption of the cooling part in the hollow area corresponding to the temperature zone is determined according to the difference between the standard temperature of each temperature zone at the set time and the temperature of each grid unit on the casting corresponding to the temperature zone at the set time and the cooling intensity coefficient.

3. The casting method according to claim 2, characterized in that: The step of determining the standard temperature of each temperature zone at the set time according to the number of divisions of the temperature zone during prediction, the lowest temperature and the highest temperature of the surface of the casting to be produced at the set time, comprises: The standard temperature of each temperature zone at the set time is determined by the following relationship: is the standard temperature of each temperature zone of number a at the set time, T min is the minimum temperature of the surface of the casting to be produced at the set time, T max is the maximum temperature of the surface of the casting to be produced at the set time, a is the number of the temperature zone formed by dividing the casting to be produced from bottom to top in the height direction, and b is the number of divisions of the temperature zone.

4. The casting method according to claim 3, characterized in that: Determining the maximum difference among the obtained multiple differences according to the difference between the standard temperature of each temperature zone at the set time and the temperature of each grid unit on the casting corresponding to the temperature zone at the set time, comprises: The maximum difference among the obtained multiple differences is determined by the following relationship: ΔT max is the maximum difference among the multiple differences obtained, T i,j,k For each temperature zone numbered a, the temperature of the grid unit on the casting whose coordinates are represented by (i, j, k) at a set time.

5. The casting method according to claim 4, characterized in that: Determining the required water absorption of the cooling part in the hollow area corresponding to the temperature zone according to the standard temperature of each temperature zone at the set time and the difference between the temperature of each grid unit on the casting corresponding to the temperature zone at the set time and the cooling intensity coefficient includes: The required water absorption amount of the cooling part in the hollow area corresponding to the temperature area numbered a is determined by the following relationship: m w is the required water absorption of the cooling part in the hollow area corresponding to the temperature area, c is the cooling intensity coefficient, where, N is the total number of grid cells on the casting corresponding to the temperature zone numbered a, m w_max It is the maximum water absorption of the cooling part in a hollow area.

6. The casting method according to claim 1, characterized in that: The step of injecting water into the corresponding hollow area according to the required water absorption amount of each cooling part comprises: Determine the required water injection time corresponding to the required water absorption amount according to the corresponding relationship between the water absorption amount and the water injection time under different types of the cooling parts; Water is injected into the corresponding hollow area according to the required water injection time.

7. The casting method according to claim 1, characterized in that: The method further comprises: pouring the melt into the casting cavity, and before cooling to form a casting; The water-filled sand mold assembly is placed for a set period of time.

8. The casting method according to claim 1, characterized in that: The shell-type structure includes a main body and a plurality of protruding structures protruding from the outer side of the main body, wherein the plurality of protruding structures are arranged at intervals along the height direction of the main body, and the main body and two adjacent protruding structures enclose the hollow area.

9. The casting method according to claim 8, characterized in that: The thickness of the protrusion structure is greater than or equal to 5 mm; and / or The length of the protruding structure extending from the outer side of the main body is greater than or equal to 30 mm; and / or The ratio of the distance between two adjacent protrusion structures away from the side of the main body to the length of the protrusion structure extending from the outer side of the main body is less than or equal to 3; and / or The angle between the extending direction of the protruding structure and the horizontal direction is greater than or equal to -10°.

10. A casting, characterized in that: The method is prepared by the casting method according to any one of claims 1 to 9.

Images