A method of producing an alloy block

Abstract

This application provides a method for preparing an alloy block, relating to the field of alloy materials. The thickness of the cladding layer of the alloy block can be determined based on the pouring temperature during the casting process and the duration of molten metal scouring the target location of the casting. The alloy block prepared based on this cladding layer thickness can melt upon completion of casting and release alloying elements to the designated location of the casting, thereby alloying the specified location and improving the local mechanical properties of the casting.

Description

Technical Field

[0001] This application relates to the field of alloy materials, and in particular to a method for preparing an alloy block. Background Technology

[0002] Currently, in the production of castings such as engines and machine tools, the requirements for the mechanical properties of the castings differ between the local and overall parts. Therefore, it is necessary to improve the local mechanical properties of the castings.

[0003] To improve the local mechanical properties of castings, alloy blocks are usually placed at designated locations in the casting. These alloy blocks melt during the casting process, releasing alloying elements into the designated locations.

[0004] However, when molten metal is poured at high temperatures, the alloy block usually melts before the casting is completed, and the released alloying elements flow into other parts of the casting, making it impossible to alloy the designated parts of the casting. Summary of the Invention

[0005] To address the problems in the prior art, this application provides a method for preparing an alloy block. This method can prepare an alloy block that melts upon completion of casting and releases alloying elements to a designated location in the casting, thereby alloying the designated location and improving the local mechanical properties of the casting.

[0006] In a first aspect, embodiments of this application provide a method for preparing an alloy block, the method comprising:

[0007] The pouring temperature and the duration of molten metal washing over the target position of the casting during the casting process are obtained; the target position is the location where the alloy block is placed during the casting process.

[0008] The thickness of the coating layer of the alloy block is determined based on the pouring temperature and the pouring time.

[0009] The alloy block is prepared based on the thickness of the coating layer; the alloy block includes the coating layer and an alloy core material wrapped in the coating layer.

[0010] In one possible implementation, determining the thickness of the cladding layer of the alloy block based on the casting temperature and the duration includes:

[0011] Determine the first product of the pouring temperature and the first parameter;

[0012] Determine the second product of the duration and the second parameter;

[0013] The thickness of the coating layer of the alloy block is determined based on the first product and the second product.

[0014] In one possible implementation, the first parameter and the second parameter are determined by the following steps:

[0015] Based on the obtained correspondence between multiple sets of pouring temperatures, scouring duration, and coating thickness, the first parameter and the second parameter are determined; the scouring duration is the duration for molten metal to scour the target position of the casting.

[0016] In one possible implementation, determining the first parameter and the second parameter based on the obtained correspondence between multiple sets of pouring temperatures, scouring durations, and coating thicknesses includes:

[0017] Repeat the following steps:

[0018] Obtain multiple sets of correspondences between pouring temperature, scouring time and coating thickness, and determine the first initial parameter and the second initial parameter based on the obtained multiple sets of correspondences;

[0019] Based on the first initial parameter and the second initial parameter, the thickness of the coating layer to be verified is determined, and an alloy block to be tested is prepared based on the thickness to be verified.

[0020] The alloy block to be tested is placed at the target position of the casting to be tested and then poured.

[0021] To determine whether the casting to be tested is qualified;

[0022] If the casting to be tested is unqualified, the process returns to the step of obtaining the correspondence between multiple sets of pouring temperature, scouring time and coating thickness, and determining the first initial parameter and the second initial parameter.

[0023] Until the casting to be tested is qualified, the current first initial parameter and second initial parameter are used as the first parameter and second parameter.

[0024] In one possible implementation, detecting whether the casting to be tested is qualified includes:

[0025] If the tensile strength at the target location of the casting to be tested is less than the set tensile strength threshold, then the casting to be tested is determined to be unqualified.

[0026] In one possible implementation, detecting whether the casting to be tested is qualified includes:

[0027] If the yield strength at the target location of the casting to be tested is less than the set yield strength threshold, then the casting to be tested is determined to be unqualified.

[0028] In one possible implementation, detecting whether the casting to be tested is qualified includes:

[0029] If the elongation rate at the target location of the casting to be tested is less than the set elongation rate threshold, then the casting to be tested is determined to be unqualified.

[0030] In one possible implementation, detecting whether the casting to be tested is qualified includes:

[0031] The metallographic structure at the target location of the casting to be tested is detected;

[0032] If the metallographic structure at the target location of the casting to be tested is unqualified, then the casting to be tested is determined to be unqualified.

[0033] In one possible implementation, the material of the cladding layer is the same as the material of the casting.

[0034] In one possible implementation, the alloy core material comprises silicon, magnesium, and rare earth elements.

[0035] The technical solution provided in this application has at least the following beneficial effects:

[0036] This application provides a method for preparing an alloy block, which determines the thickness of the cladding layer of the alloy block based on the pouring temperature during the casting process and the duration of molten metal scouring the target location of the casting. The alloy block prepared based on this cladding layer thickness can melt upon completion of casting and release alloying elements to a designated location in the casting, thereby alloying that location and improving the local mechanical properties of the casting. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of an alloy block provided in an embodiment of this application;

[0039] Figure 2 A schematic diagram of the metallographic structure of a target location of an alloy block provided in an embodiment of this application;

[0040] Figure 3 A schematic diagram of the metallographic structure of the remaining parts of an alloy block provided in an embodiment of this application;

[0041] Figure 4 A flowchart illustrating a method for preparing an alloy block, as provided in an embodiment of this application;

[0042] Figure 5A flowchart illustrating a method for preparing a casting provided in this application embodiment;

[0043] Figure 6 A flowchart illustrating another method for preparing a casting provided in this application embodiment. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] It should be noted that the terms "comprising" and "having" and their variations used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0046] Currently, there are many problems in producing castings such as engines and machine tools, which have different requirements for local and overall mechanical properties.

[0047] For an engine, the bearing mating area is the location of the highest load on the entire engine block. To meet the mechanical performance requirements of the bearing mating area, the cast iron grade of the entire engine block needs to be adjusted to a high-grade cast iron that meets the mechanical performance requirements of the bearing mating area. However, this results in significant performance overkill and cost waste for the other parts of the engine block with lower mechanical performance requirements.

[0048] For machine tools, the worktable needs to have good vibration resistance, while the guide rails connected to the worktable need to have excellent wear resistance. Traditional machine tool manufacturing processes involve welding two different materials, which is complex and has low production efficiency.

[0049] To address the aforementioned issues, existing solutions involve integrally casting parts with varying mechanical properties in different areas and overall. Specifically, alloy blocks can be placed at designated locations within the casting, melting during the pouring process and releasing alloying elements into those areas. However, under the high temperatures of molten metal pouring, the alloy blocks typically melt before the casting is complete, causing the released alloying elements to flow into other parts of the casting, preventing the designated locations from being alloyed.

[0050] Based on this, embodiments of this application provide a method for preparing an alloy block, which can determine the thickness of the coating layer of the alloy block according to the pouring temperature during the casting process and the duration of the molten metal scouring the target location of the casting. The alloy block prepared based on the thickness of the coating layer can melt when the casting is completed and release alloying elements to the designated location of the casting, thereby alloying the designated location of the casting and improving the local mechanical properties of the casting.

[0051] To further illustrate the technical solutions provided in the embodiments of this application, a detailed description is provided below in conjunction with the accompanying drawings and specific implementation methods. Although the embodiments of this application provide method operation steps as shown in the following embodiments or drawings, the method may include more or fewer operation steps based on conventional or non-inventive methods. In steps where there is no logically necessary causal relationship, the execution order of these steps is not limited to the execution order provided in the embodiments of this application. In actual processing or when the device executes the method, it may be executed in the order shown in the embodiments or drawings, or in combination.

[0052] Figure 1 A schematic diagram of the structure of an alloy block provided in an embodiment of this application is shown. Figure 1 As shown, the alloy block includes an alloy core and a cladding layer surrounding the alloy core. A fixing device can secure the alloy block to a designated position on the casting. During the casting process, when molten metal reaches the designated position, the cladding layer of the alloy block begins to melt. At the moment the casting is completed, the cladding layer melts completely, releasing the alloying elements from the alloy core, thus alloying the designated position on the casting and improving the local mechanical properties of the casting.

[0053] Before preparing the aforementioned alloy block, the thickness of the cladding layer needs to be determined. The thickness of the cladding layer can be determined based on a functional relationship model between the thickness of the cladding layer, the casting temperature, and the duration of molten metal scouring the target location of the casting.

[0054] The following example, using a casting as the engine and the target position of the casting as the bearing plate position, illustrates the method for determining the above functional relationship model.

[0055] Specifically, a functional relationship model can be established between the thickness of the alloy block's coating layer and the engine's casting temperature and the duration of molten metal scouring at the bearing hole position. This functional relationship model can be expressed by formula (1), which can be represented as:

[0056] Th=a*T+b*t+c————Formula (1)

[0057] Where Th represents the thickness of the cladding layer of the alloy block, a represents the first parameter, T represents the casting temperature of the engine, b represents the second parameter, t represents the duration for the bearing hole to be scoured by molten metal, and c represents the correction constant.

[0058] Furthermore, simulation calculation models can be used to determine the corresponding relationships between the casting temperature, the duration of molten metal scouring the tile opening, and the thickness of the corresponding cladding layer during the multiple engine casting processes shown in Table 1.

[0059]

[0060] Furthermore, regression analysis can be performed on the relationships between casting temperature, duration of molten metal scouring the bearing chute, and corresponding coating thickness during multiple engine casting processes to determine the first initial parameter, the second initial parameter, and the correction constant. For example, after performing regression analysis on the 60 sets of data in Table 1 above, the first initial parameter is determined to be 0.00348, the second initial parameter to be 0.0592, and the correction constant to be -4.86.

[0061] Therefore, the functional relationship between the thickness of the alloy block's coating layer and the engine's casting temperature and the duration of molten metal scouring at the bearing hole position can be expressed by formula (2), which can be represented as:

[0062] Th=0.00348*T+0.0592*t-4.86————Formula(2)

[0063] Furthermore, the thickness to be verified of the coating layer of the alloy block to be tested can be determined based on formula (2), and the alloy block to be tested can be prepared based on the thickness to be verified.

[0064] Specifically, the casting temperature T of the engine is 1405℃, and the time t for the engine bearing mouth to be scoured by molten metal is 19 seconds. Therefore, the thickness to be verified of the coating layer of the alloy block to be tested can be determined as 0.00348*1405+0.0592*19-4.86=1.1542 (mm), and the alloy block to be tested is prepared based on this thickness.

[0065] In one alternative embodiment, to avoid the molten coating affecting the mechanical properties of the casting, a material with the same or similar chemical composition as the casting material can be selected to prepare the coating.

[0066] For example, since the engine is made of cast iron, steel sheet, whose main chemical component is iron, can be used as the cladding material.

[0067] After determining the thickness and material of the cladding layer of the alloy block to be tested, it is also necessary to determine the composition of the alloy core material encased in the cladding layer. The composition of the alloy core material can be determined based on the mechanical property requirements of the target location in the casting.

[0068] Continuing with the engine as an example, the mechanical properties required for the bearing joint of an engine are a tensile strength greater than or equal to 410 MPa and an elongation greater than or equal to 1.5%. The molten metal used for casting the engine is molten iron RuT300. Therefore, the alloy core material can be selected from 40% to 60% silicon, 5% to 10% magnesium, 2% to 5% rare earth elements, and small amounts of nickel, chromium, phosphorus, iron, copper, carbon, manganese, tin, sulfur, and molybdenum.

[0069] After determining the thickness, material, and composition of the core material of the coating layer of the alloy block to be tested, the materials required for preparing the alloy block to be tested can be loaded into the mold, and the alloy block to be tested can be pressed using a hydraulic press.

[0070] After preparing the alloy block to be tested, the alloy block to be tested can be placed at the target position of the casting to be tested and poured. After the pouring is completed, the casting to be tested is obtained, and the casting to be tested is checked to see if it is qualified.

[0071] If the casting to be inspected fails, the process returns to the previous steps to obtain the correspondence between multiple sets of pouring temperature, scouring time and coating thickness, and to determine the first initial parameter and the second initial parameter, until the casting to be inspected passes. The current first initial parameter and the second initial parameter are then used as the first parameter and the second parameter.

[0072] If the casting to be inspected is qualified, the current first initial parameter and second initial parameter can be directly used as the first parameter and second parameter.

[0073] For example, the following methods can be used to determine whether a casting to be inspected is qualified.

[0074] In one alternative implementation, the tensile strength at a target location of the casting to be tested can be detected, and the casting to be tested can be determined as qualified based on the tensile strength.

[0075] In some embodiments, if the tensile strength at the target location of the casting to be tested is less than a set tensile strength threshold, the casting to be tested can be determined to be unqualified.

[0076] The tensile strength threshold can be set according to actual conditions, and this application does not limit it. For example, the tensile strength threshold corresponding to the bearing mouth position of the engine can be 410 MPa.

[0077] Specifically, the tensile strength at the engine bearing mouth can be tested. If the tensile strength is less than 410 MPa, the engine is deemed unqualified. The process then returns to the previous steps to obtain the correspondence between multiple sets of casting temperature, scouring time, and coating thickness, and to determine the first and second initial parameters.

[0078] In other embodiments, if the tensile strength at the target location of the casting to be tested is greater than or equal to a set tensile strength threshold, the casting to be tested is determined to be qualified.

[0079] Specifically, the tensile strength at the bearing mouth of the engine can be tested. If the tensile strength is greater than or equal to 410 MPa, the engine can be determined to be qualified. The current first and second initial parameters can be used as the first and second parameters.

[0080] In another alternative implementation, the yield strength at a target location of the casting to be tested can be detected, and the casting's qualification can be determined based on the yield strength.

[0081] In some embodiments, if the yield strength at the target location of the casting to be tested is less than a set yield strength threshold, the casting to be tested is determined to be unqualified.

[0082] The yield strength threshold can be set according to actual conditions, and this application does not limit it. For example, the yield strength threshold corresponding to the bearing mouth position of the engine can be 312 MPa.

[0083] Specifically, the yield strength at the engine bearing mouth position can be detected. If the yield strength is less than 312 MPa, the engine can be determined to be unqualified. Then, the process returns to obtain the correspondence between multiple sets of casting temperature, scouring time and coating thickness, and determines the first initial parameter and the second initial parameter.

[0084] In other embodiments, if the yield strength at the target location of the casting to be tested is greater than or equal to a set yield strength threshold, the casting to be tested is determined to be qualified.

[0085] Specifically, the yield strength at the bearing mouth of the engine can be detected. If the yield strength is greater than or equal to 312 MPa, the engine can be determined to be qualified. The current first and second initial parameters are then used as the first and second parameters.

[0086] In another alternative implementation, the elongation rate at a target location of the casting to be tested can be detected, and the casting to be tested can be determined as qualified based on the elongation rate.

[0087] In some embodiments, if the elongation at the target location of the casting to be inspected is less than a set elongation threshold, the casting to be inspected is determined to be unqualified.

[0088] The elongation threshold can be set according to actual conditions, and this application does not limit it. For example, the yield strength threshold corresponding to the bearing mouth position of the engine can be 1.5%.

[0089] Specifically, the elongation rate at the engine bearing mouth position can be detected. If the elongation rate is less than 1.5%, the engine is determined to be unqualified. The process then returns to the previous step of obtaining the correspondence between multiple sets of casting temperature, scouring time and coating thickness, and determining the first and second initial parameters.

[0090] In other embodiments, if the elongation at the target location of the casting to be tested is greater than or equal to a set elongation threshold, the casting to be tested is determined to be qualified.

[0091] Specifically, the elongation rate at the engine bearing mouth position can be detected. If the elongation rate is greater than or equal to 1.5%, the engine can be determined to be qualified, and the current first and second initial parameters are used as the first and second parameters.

[0092] In another alternative implementation, the metallographic structure at a target location of the casting to be tested can be detected, and the quality of the casting to be tested can be determined based on the metallographic structure.

[0093] In some embodiments, if the metallographic structure at the target location of the casting to be tested is as follows: Figure 2 As shown, under microstructure, some graphite morphology is spherical. The metallographic structure of the casting under test, excluding the target location, is as follows. Figure 3 As shown, the graphite morphology is worm-like under microstructure, which indicates that the casting to be tested is qualified. The current first initial parameter and second initial parameter can be used as the first parameter and second parameter.

[0094] Furthermore, once the casting to be tested is determined to be qualified, a functional relationship model for preparing the alloy block can be determined, and the alloy block can be prepared based on this functional relationship model.

[0095] The following describes a method for preparing alloy blocks based on this functional relationship model.

[0096] Figure 4 A flowchart of a method for preparing an alloy block according to an embodiment of this application is shown. This method can produce corresponding alloy blocks for different castings.

[0097] It should be noted that the alloy block preparation method provided in this application can produce different alloy blocks for different castings. The following explanation uses the preparation of an alloy block to improve the mechanical properties of the bearing arch of an engine as an example. Figure 4 As shown, the preparation method of this alloy block may include the following steps:

[0098] Step S401: Obtain the pouring temperature and the duration of molten metal washing over the target position of the casting during the casting process.

[0099] The target location is the position used to place the alloy block during the casting process.

[0100] For the engine cylinder block, the bearing arch is the location subject to the greatest load on the entire block; therefore, the target location for placing the alloy block is the bearing arch. The engine's casting temperature and the duration for which the bearing arch is washed by molten metal are preset values. For example, the engine's casting temperature could be 1405°C, and the bearing arch could be washed by molten metal for 19 seconds.

[0101] Step S402: Determine the thickness of the coating layer of the alloy block based on the pouring temperature and duration.

[0102] After determining the casting temperature of the engine and the duration of the molten metal scouring the bearing hole, the thickness of the coating layer of the alloy block can be determined based on the functional relationship model between the thickness of the coating layer of the alloy block and the casting temperature of the engine and the duration of the molten metal scouring the bearing hole, i.e., formula (2) above.

[0103] By inputting the engine's casting temperature and the duration of the molten metal scouring the bearing hole into formula (2), the thickness of the alloy block's coating layer can be determined as 0.00348*1405+0.0592*19-4.86=1.1542(mm).

[0104] Step S403: Based on the thickness of the coating layer, prepare the alloy block.

[0105] Once the thickness of the coating layer of the alloy block is obtained, the alloy block can be prepared based on the thickness of the coating layer.

[0106] In one alternative embodiment, to avoid the molten coating affecting the mechanical properties of the casting, a material with the same or similar chemical composition as the casting material can be selected to prepare the coating.

[0107] Since the engine is made of cast iron, steel sheet, whose main chemical component is iron, can be used as the cladding material.

[0108] After determining the thickness and material of the cladding layer of the alloy block, it is also necessary to determine the composition of the alloy core material encased in the cladding layer. The composition of the alloy core material can be determined based on the mechanical property requirements of the target location in the casting.

[0109] Continuing with the engine as an example, the mechanical properties required for the bearing joint of an engine are a tensile strength greater than or equal to 410 MPa and an elongation greater than or equal to 1.5%. The molten metal used for casting the engine is molten iron RuT300. Therefore, the alloy core material can be selected from 40% to 60% silicon, 5% to 10% magnesium, 2% to 5% rare earth elements, and small amounts of nickel, chromium, phosphorus, iron, copper, carbon, manganese, tin, sulfur, and molybdenum.

[0110] After determining the thickness and material of the cladding layer of the alloy block, as well as the composition of the alloy core material, the materials required to prepare the alloy block can be loaded into the mold, and the alloy block can be pressed using a hydraulic press.

[0111] The alloy block preparation method provided in this application addresses the problem that the alloy block melts before the casting is completed during high-temperature pouring of molten metal. The thickness of the coating layer of the alloy block is determined based on the pouring temperature during the casting process and the duration of molten metal scouring the target location of the casting. The alloy block prepared based on this coating layer thickness can melt instantly upon completion of casting and release alloying elements to the designated location of the casting, thereby alloying that location and improving the local mechanical properties of the casting.

[0112] After the alloy block is prepared, castings can be made based on the alloy block. See [link to documentation]. Figure 5 This application also provides a method for preparing a casting, the method comprising: step 501: pouring vermicular graphite cast iron molten iron into a sand mold, so that the vermicular graphite cast iron molten iron comes into contact with an alloy block preset in the sand mold, and the vermicular graphite cast iron molten iron in contact with the alloy block undergoes a spheroidizing reaction to form ductile iron, thereby obtaining a casting.

[0113] As an optional implementation, the preparation method further includes a step of pre-treating the sand mold, the pre-treatment including applying a coating to the surface of the sand mold that is in contact with the molten graphite cast iron.

[0114] As an alternative implementation, the casting is an engine housing, and the preset position of the alloy block in the sand mold is the position in the sand mold used to form the bearing opening of the engine housing.

[0115] Specifically, when the casting is an engine housing, the bearing gap is subjected to a large fatigue load during use. Therefore, the bearing gap needs to have good thermal fatigue resistance. If the core is vermicular graphite cast iron, it will greatly reduce the tensile strength and thermal fatigue resistance of the bearing gap. Therefore, spheroidizing treatment is required for this part.

[0116] See Figure 6 This application provides a method for preparing a casting, comprising:

[0117] Step 601: Apply coating to the surface of the sand mold that will come into contact with the molten graphite cast iron.

[0118] Step 602: Pour vermicular graphite cast iron molten iron into the sand mold, so that the vermicular graphite cast iron molten iron comes into contact with the alloy block pre-set in the sand mold. The vermicular graphite cast iron molten iron in contact with the alloy block undergoes a spheroidizing reaction to form ductile iron, and a casting is obtained.

[0119] Based on the same technical concept, this application also provides a casting prepared by the above-described casting preparation method.

[0120] As an alternative implementation, the casting is an engine housing, the bearings of which are formed of ductile iron or a composite material of vermicular graphite cast iron and ductile iron integrally formed.

[0121] When the casting is an engine housing, the spheroidized parts can be spheroidized according to actual needs. The constituent materials of different parts of the engine housing can be specifically determined. It can be locally made of ductile iron, or when the entire engine housing needs to have high tensile strength and good thermal fatigue resistance, the entire engine housing can be formed by a composite material of vermicular graphite cast iron and ductile iron that are integrally molded and connected.

[0122] This application enables a single casting to possess the composite properties of both vermicular graphite cast iron and ductile iron, avoiding the need for high performance in localized areas of the casting, thereby improving the overall performance of the casting, saving casting costs, utilizing the good castability of vermicular graphite cast iron for pre-pouring and filling to ensure the integrity of complex thin-walled castings, and using alloy blocks to spheroidize localized areas of the casting, so that different parts of the casting possess the properties of different cast iron materials, thus achieving composite material properties in the casting.

[0123] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing an alloy block, characterized in that, The method includes: The pouring temperature and the duration of molten metal scouring the target position of the casting during the casting process are obtained; the target position is the location used to place the alloy block during the casting process. Determine the first product of the pouring temperature and the first parameter; The second product of the scouring duration and the second parameter is determined; wherein the first parameter and the second parameter are determined by the following steps: repeatedly executing the following steps: obtaining multiple sets of correspondences between pouring temperature, scouring duration, and coating thickness, and determining the first initial parameter and the second initial parameter based on the obtained multiple sets of correspondences; determining the coating thickness to be verified based on the first initial parameter and the second initial parameter, and preparing an alloy block to be tested based on the thickness to be verified; placing the alloy block to be tested at the target position of the casting to be tested and pouring; checking whether the casting to be tested is qualified; if the casting to be tested is unqualified, returning to the step of obtaining multiple sets of correspondences between pouring temperature, scouring duration, and coating thickness, and determining the first initial parameter and the second initial parameter; until the casting to be tested is qualified, the current first initial parameter and the second initial parameter are used as the first parameter and the second parameter; The thickness of the coating layer of the alloy block is determined based on the first product and the second product; The alloy block is prepared based on the thickness of the coating layer; the alloy block includes the coating layer and an alloy core material wrapped in the coating layer.

2. The method according to claim 1, characterized in that, The detection of whether the casting to be tested is qualified includes: If the tensile strength at the target location of the casting to be tested is less than the set tensile strength threshold, then the casting to be tested is determined to be unqualified.

3. The method according to claim 1, characterized in that, The detection of whether the casting to be tested is qualified includes: If the yield strength at the target location of the casting to be tested is less than the set yield strength threshold, then the casting to be tested is determined to be unqualified.

4. The method according to claim 1, characterized in that, The detection of whether the casting to be tested is qualified includes: If the elongation rate at the target location of the casting to be tested is less than the set elongation rate threshold, then the casting to be tested is determined to be unqualified.

5. The method according to claim 1, characterized in that, The detection of whether the casting to be tested is qualified includes: The metallographic structure at the target location of the casting to be tested is detected; If the metallographic structure at the target location of the casting to be tested is unqualified, then the casting to be tested is determined to be unqualified.

6. The method according to claim 1, characterized in that, The material of the cladding layer is the same as the material of the casting.

7. The method according to claim 1, characterized in that, The alloy core material includes silicon, magnesium, and rare earth elements.

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