A method and device for developing airway based on selective laser melting technology

Abstract

The present application discloses an airway development method and device based on selective laser melting technology. First, the airway prototype is printed using selective laser melting technology, and a strain gauge is set to obtain the deformation of the strain gauge with the airway prototype under high and low temperature conditions. Then, the airway prototype is tested by a blowing experiment. When it is judged that the airway prototype test fails, the airway model is optimized for printing based on the test results and deformation. The method described in the present application uses 3D printing to produce an airway prototype that can reflect the shape and dimensional deviation of the casting. There is no need to manufacture actual castings, split and scan, which makes the entire test cycle shorter, the cost lower, and realizes rapid iterative work. At the same time, the prototype has the size and shape of the actual product. While ensuring the accuracy of the test results, it is also continuously verified and optimized, so as to accurately and quickly develop the airway.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to an airway development method and device based on selective laser melting technology. Background Art

[0002] The engine's airway is located inside the cylinder head and has a complex structure. In order to meet development requirements such as swirl ratio and flow coefficient, the airway is required to have good precision and consistency. Since the manufacturing process of the cylinder head includes multiple factors such as casting and processing, and the process detection and control are difficult, repeated debugging is required.

[0003] In the prior art, simulation experiments or casting test pieces are generally used to develop airways that meet the requirements. However, there are certain differences between the actual operation results and the simulation results, and the development cycle of casting test pieces is long and time-consuming. Therefore, how to accurately and quickly develop airways has become an urgent problem to be solved. Summary of the invention

[0004] Based on the above problems, the present application provides an airway development method and device based on selective laser melting technology to accurately and quickly develop the airway.

[0005] The present application discloses a gas channel development method based on selective laser melting technology, the method comprising:

[0006] Using selective laser melting technology to print out the airway prototype according to the airway model;

[0007] Disposing a strain gauge on the wall of the airway prototype;

[0008] Performing a blowing test on the airway prototype to obtain test results and deformation of the strain gauge under high and low temperature conditions;

[0009] Determine whether the airway prototype has passed the test according to the test result;

[0010] If not, based on the test results and the deformation conditions, the airway model is optimized until the test is qualified.

[0011] Optionally, before printing out the airway prototype according to the airway model using the selective laser melting technology, the method further includes:

[0012] Design the original model of the cylinder head;

[0013] Performing CFD simulation on the cylinder head original model to evaluate whether the performance index of the air passage in the cylinder head original model meets the preset conditions;

[0014] If yes, then obtaining the airway model according to the cylinder head original model;

[0015] If not, the cylinder head original model is optimized until the performance index meets the preset condition.

[0016] Optionally, acquiring the airway model according to the cylinder head original model includes:

[0017] Perform casting process design and sand core design according to the cylinder head original model to obtain a sand core assembly model;

[0018] Performing deformation simulation on the sand core assembly model;

[0019] Designing a cylinder head model based on the sand core assembly model after the deformation simulation;

[0020] The cylinder head model is decomposed to obtain the airway model.

[0021] Optionally, judging whether the airway prototype has passed the test according to the test result includes:

[0022] Compare the test result with the test preset value to determine whether the comparison result is within the deviation range;

[0023] If yes, the airway prototype is judged to be qualified;

[0024] If not, the airway prototype is judged to be unqualified.

[0025] Optionally, the performance index and the test result both include swirl ratio and flow coefficient.

[0026] Optionally, optimizing the airway model until the test is qualified includes:

[0027] Optimizing the sand core assembly model to simultaneously optimize the airway model, and continuously performing a blowing experiment test on the airway prototype printed according to the airway model;

[0028] When the cumulative number of test failures reaches a preset number, the cylinder head original model is optimized to simultaneously optimize the airway model until the test is qualified.

[0029] Based on the above-mentioned airway development method based on selective laser melting technology, the present application also discloses an airway development device based on selective laser melting technology, including: a printing unit, a strain gauge setting unit, a testing unit, a qualified judgment unit and an optimization unit;

[0030] The printing unit is used to print out an airway prototype according to the airway model using a selective laser melting technique;

[0031] The strain gauge setting unit is used to set a strain gauge on the wall of the airway prototype;

[0032] The testing unit is used to perform a blowing test on the airway prototype to obtain the test results and the deformation of the strain gauge under high and low temperature conditions;

[0033] The qualified judgment unit is used to judge whether the airway prototype has passed the test according to the test result;

[0034] The optimization unit is used to optimize the airway model until the test is qualified based on the test result and the deformation condition.

[0035] Optionally, the device further comprises:

[0036] Original model design unit, used to design the original model of the cylinder head;

[0037] A performance index judgment unit, used to perform CFD simulation on the cylinder head original model to evaluate whether the performance index of the airway in the cylinder head original model meets the preset conditions;

[0038] an airway model acquisition unit, configured to acquire the airway model according to the cylinder head original model;

[0039] The original model optimization unit is used to optimize the cylinder head original model if no, until the performance index meets the preset condition.

[0040] Optionally, the original model optimization unit includes:

[0041] A sand core model acquisition subunit is used to perform casting process design and sand core design according to the cylinder head original model to obtain a sand core assembly model;

[0042] A deformation simulation subunit, used for performing deformation simulation on the sand core assembly model;

[0043] A model design subunit, used for designing a cylinder head model based on the sand core assembly model after the deformation simulation;

[0044] The model decomposition subunit is used to decompose the cylinder head model to obtain the airway model.

[0045] Optionally, the qualification judgment unit includes:

[0046] A comparison subunit, used to compare the test result with a preset test value to determine whether the comparison result is within a deviation range;

[0047] If yes, the airway prototype is judged to be qualified;

[0048] If not, the airway prototype is judged to be unqualified.

[0049] Optionally, the performance index and the test result both include swirl ratio and flow coefficient.

[0050] Optionally, the optimization unit includes:

[0051] A sand core model optimization subunit, used for optimizing the sand core assembly model to simultaneously optimize the airway model, and continuously performing a blowing experiment test on the airway prototype printed according to the airway model;

[0052] The original model optimization subunit is used to optimize the cylinder head original model to simultaneously optimize the airway model when the cumulative number of test failures reaches a preset number, until the test is qualified.

[0053] The present application discloses an airway development method and device based on selective laser melting technology. First, the airway prototype is printed using selective laser melting technology, and a strain gauge is set to obtain the deformation of the strain gauge with the airway prototype under high and low temperature conditions. Then, the airway prototype is tested by a blowing experiment. When it is judged that the airway prototype test fails, the airway model is optimized for printing based on the test results and deformation. The method described in the present application uses 3D printing to produce an airway prototype that can reflect the shape and dimensional deviation of the casting. There is no need to manufacture actual castings, split and scan, which makes the entire test cycle shorter, the cost lower, and realizes rapid iterative work. At the same time, the prototype has the size and shape of the actual product. While ensuring the accuracy of the test results, it is also continuously verified and optimized, so as to accurately and quickly develop the airway. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0055] Figure 1 A schematic diagram of a flow chart of a gas channel development method based on selective laser melting technology disclosed in an embodiment of the present application;

[0056] Figure 2 A schematic flow chart of another gas channel development method based on selective laser melting technology disclosed in an embodiment of the present application;

[0057] Figure 3 This is a schematic structural diagram of an airway development device based on selective laser melting technology disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0059] Embodiment 1: This application discloses an airway development method based on selective laser melting technology.

[0060] For details, please refer to Figure 1 , a gas channel development method based on selective laser melting technology disclosed in this embodiment includes the following steps:

[0061] Step 101: Print an airway prototype according to the airway model using selective laser melting technology.

[0062] In the method described in this embodiment, as an optional method, the original model of the cylinder head can be designed according to the performance indicators expected by the user for the engine. The performance indicators include the swirl ratio and flow coefficient of the airway in the cylinder head. Then, a fluid simulation software, such as StarCCM+, is used to perform CFD simulation (Computational Fluid Dynamics simulation) on the airway in the original model of the cylinder head to evaluate whether the performance indicators of the airway meet the preset conditions. If the preset conditions are not met, the original model of the cylinder head is optimized until the performance indicators meet the preset conditions to obtain an airway that can meet the most basic swirl ratio and flow coefficient requirements. If the preset conditions are met, the casting process design and sand core design can be performed according to the original model of the cylinder head to obtain a sand core assembly model.

[0063] In the method described in this embodiment, the casting process design refers to selecting different casting processes for different materials when manufacturing a diesel engine. As an optional method, for example, the cylinder head of a cast iron diesel engine can use a gravity casting process and a lost foam process, and the cylinder head of a cast aluminum diesel engine can use a low-pressure or high-pressure casting process. The sand core can be simply said to be a mold for casting a cylinder head, which is mainly used to form the inner hole and inner cavity of the casting when the casting has a complex inner cavity. Some outer shapes that hinder demolding and are not easy to sand out can also be formed with sand cores. The sand core design can include determining the number, shape and size of the sand core, and the sand core assembly model can be obtained through casting process design and sand core design. It has different structures, such as sprues, runners, ingates and risers, which provide accurate data for subsequent force analysis of the cylinder head.

[0064] In the method described in this embodiment, the sand core assembly model may be heated, stressed, collapsed and deformed during the casting process. Therefore, a deformation simulation can be performed on it, so that the cylinder head model deforms along with the deformation of the sand core assembly model, and the deformation simulation result of the cylinder head model is obtained. As an optional method, the filling, solidification and stress of the cylinder head model are calculated in finite element or finite difference simulation software (such as MAGMA, ProCAST, AnyCasting, Flow-3D, etc.) to obtain the stress and deformation of the cylinder head model. Finally, based on the deformation simulation results of the cylinder head, the cylinder head model is derived, and the airway model is decomposed from it.

[0065] In the method described in this embodiment, the airway prototype is printed out according to the airway model using selective laser melting technology.

[0066] The selective laser melting SLM (Selective laser melting) technology is a main technical approach in the additive manufacturing of metal materials. This technology uses laser as an energy source, and scans the metal powder bed layer by layer according to the path planned in the model. The scanned metal powder is melted and solidified to achieve the effect of metallurgical bonding, and finally obtains the same metal parts as the model. In the method described in this embodiment, as an optional method, the airway prototype is manufactured by 3D printing, which can form metal materials close to the cylinder head material, such as aluminum alloy materials and cast iron materials. The airway components or the cylinder head as a whole can also be molded according to actual needs. The strength of the prototype manufactured is not lower than that of the casting, and it can be followed by the casting for various working conditions such as high temperature experiments. And the optimal surface roughness can achieve 5um, which is conducive to the comparative study of airway parts with different precision (surface roughness) and the analysis of the influence of the surface quality of the airway parts on the quality of the airway.

[0067] Step 102: Setting strain gauges on the wall of the airway prototype.

[0068] The strain gauge is a component composed of a sensitive grid and the like for measuring strain. When in use, it is firmly arranged on the measuring point of the casting. When the casting is subjected to force, the strain gauge is deformed due to the strain at the measuring point, thereby changing the resistance of the strain gauge. The resistance change is then measured by a special instrument and converted into the strain value of the measuring point. In the method described in this embodiment, the deformation of the airway structure under high and low temperature conditions is objective. Therefore, by setting a strain gauge on the airway wall of the airway prototype, the deformation of the airway prototype under actual high and low temperature alternating load conditions can be measured.

[0069] Step 103: Perform a blowing test on the airway prototype to obtain test results and deformation of the strain gauge under high and low temperature conditions.

[0070] In the method described in this embodiment, as an optional method, the airway prototype can be assembled to the airway blowing test bench to simulate the actual airway operating conditions to obtain the performance indicators of the airway prototype such as the swirl ratio and flow coefficient. As another optional method, a high-temperature airway test can also be performed on the airway prototype to test whether the airway prototype is deformed in the high-temperature gas.

[0071] Step 104: Determine whether the airway prototype has passed the test based on the test result.

[0072] In the method described in this embodiment, after the test is completed, the performance index (test result) obtained by the test is compared with the preset performance index (test preset value) expected during design to determine whether the comparison result is within the deviation range. As an optional method, the comparison can be a difference or a quotient, and accordingly, the comparison result can be a difference value or a quotient value. The comparison method and comparison result are not specifically limited here, and the subsequent steps of determining whether it is qualified can be performed.

[0073] In the method described in this embodiment, if the comparison result is within the deviation range, the airway prototype is judged to be qualified, otherwise the airway prototype is judged to be unqualified. For example, the test result is 1.5, the test preset value is 0.5, and the deviation range is 0 to 1. Therefore, the test result can be subtracted from the test preset value to obtain a comparison result of 1, which is just within the deviation range, and the airway prototype is judged to be qualified.

[0074] Step 105: Based on the test results and the deformation conditions, optimize the airway model until the test passes.

[0075] In the method described in this embodiment, the optimization scheme of the performance indicators of the airway prototype can be analyzed based on the test results of the blowing experiment. At the same time, the strain of the airway prototype can be analyzed based on the change in resistance of the strain gauge during the test, so as to optimize and improve the airway structure or its manufacturing process.

[0076] In the method described in this embodiment, as an optional method, when adjusting the airway structure and its manufacturing process based on the airway strain, swirl ratio, flow coefficient, etc., it is necessary to analyze the strain measurement values ​​under high and low temperature alternating loads, and convert the requirements for performance indicators such as swirl ratio and flow coefficient into the requirements for adjusting the airway structure, and return to the initial step for optimization.

[0077] Among them, as an optional method, the sand core assembly model can be optimized first, and the steps related to deformation simulation can be optimized to simultaneously optimize the cylinder head model, and then the airway model can be decomposed therefrom, and the airway prototype printed according to the airway model can be continuously tested by blowing experiments. When the cumulative number of unqualified tests reaches a preset number, the original cylinder head model is optimized, and from the perspective of design, whether the requirements for performance indicators meet the actual operation, whether the process can be improved, etc. are considered to simultaneously optimize the airway model until the test is qualified.

[0078] The method described in this embodiment uses finite element simulation to predict the deformation of the casting during the casting process, thereby obtaining an airway model after the deviation of the casting process is affected. Using 3D printing, an airway prototype that can reflect the shape and size deviation of the casting is produced based on the airway model. There is no need to manufacture actual castings, split and scan, which makes the entire test cycle shorter, the cost lower, and achieves rapid iteration. At the same time, the prototype has the size and shape of the actual product. While ensuring the accuracy of the test results, it is also continuously verified and optimized, so that the airway can be developed accurately and quickly.

[0079] Embodiment 2: This application discloses another airway development method based on selective laser melting technology, please refer to Figure 2 The method described in this embodiment introduces the entire airway development, testing and optimization process.

[0080] Step 201: Design a cylinder head prototype model according to actual requirements.

[0081] Step 202: Evaluate the performance index of the air passage in the original model of the cylinder head to determine whether it meets the preset conditions. If yes, proceed to step 204. If no, proceed to step 203.

[0082] Step 203: Optimize the original model of the cylinder head and proceed to step 202.

[0083] Step 204 : Perform casting process design and sand core design according to the original model of the cylinder head to obtain a sand core assembly model, and then proceed to step 205 .

[0084] Step 205 : performing deformation simulation on the sand core assembly model, so that the cylinder head model deforms along with the deformation of the sand core assembly model, obtaining a deformation simulation result of the cylinder head model, and proceeding to step 206 .

[0085] Step 206 : Decompose the cylinder head model to obtain the airway model, and proceed to step 207 .

[0086] Step 207 : Print out an airway prototype according to the airway model using selective laser melting technology, and then set strain gauges on its wall, and proceed to step 208 .

[0087] Step 208 : Perform a blowing test on the airway prototype to obtain the test results and the deformation of the strain gauge under high and low temperature conditions, and then proceed to step 209 .

[0088] Step 209 : Compare the test result with the test preset value and proceed to step 210 .

[0089] Step 210: Determine whether the comparison result is within the deviation range. If so, determine that the airway prototype is qualified and complete the airway development. If not, determine that the airway prototype is unqualified and proceed to step 211.

[0090] Step 211: Determine whether the number of times the airway prototype fails to meet the standards reaches a preset number. If yes, proceed to step 201. If no, proceed to step 212.

[0091] Step 212: Optimize the sand core assembly model according to the test results and the deformation of the strain gauge, and proceed to step 205.

[0092] The method described in this embodiment introduces the entire process of airway development, testing and optimization. The method described in this application constructs multiple models, continuously evaluates, tests, and optimizes until an airway prototype that can meet user needs and performance indicators is obtained, and the airway is developed accordingly. Since the entire process involves multiple iterative optimization steps, this method uses the establishment of multiple models, and through evaluation, deformation simulation, disassembly and other steps, it can eventually accurately obtain an airway model that is almost the same as the actual airway, and use selective laser melting technology to print airway prototypes for testing, which can reduce the time and cost of casting actual castings, and the airway prototypes printed by selective laser melting technology can be made of the same metal material as the actual cylinder head, and can perform high-temperature experiments simulating actual working conditions, and the deformation and performance under high and low alternating load conditions are similar to those of actual castings. Therefore, the method described in this application saves time and cost while ensuring the accuracy of modeling, test scenarios and test results.

[0093] Based on the airway development method based on selective laser melting technology disclosed in the above embodiment, this embodiment correspondingly discloses an airway development device based on selective laser melting technology. Figure 3 , the airway development device based on selective laser melting technology includes: a printing unit 301, a strain gauge setting unit 302, a testing unit 303, a qualified judgment unit 304 and an optimization unit 305;

[0094] The printing unit 301 is used to print out an airway prototype according to the airway model using a selective laser melting technique;

[0095] The strain gauge setting unit 302 is used to set a strain gauge on the wall of the airway prototype;

[0096] The testing unit 303 is used to perform a blowing test on the airway prototype to obtain the test results and the deformation of the strain gauge under high and low temperature conditions;

[0097] The qualified judgment unit 304 is used to judge whether the airway prototype has passed the test according to the test result;

[0098] The optimization unit 305 is used to optimize the airway model based on the test result and the deformation condition until the test is qualified.

[0099] Optionally, the device further comprises:

[0100] Original model design unit, used to design the original model of the cylinder head;

[0101] A performance index judgment unit, used to perform CFD simulation on the cylinder head original model to evaluate whether the performance index of the airway in the cylinder head original model meets the preset conditions;

[0102] an airway model acquisition unit, configured to acquire the airway model according to the cylinder head original model;

[0103] The original model optimization unit is used to optimize the cylinder head original model if no, until the performance index meets the preset condition.

[0104] Optionally, the original model optimization unit includes:

[0105] A sand core model acquisition subunit is used to perform casting process design and sand core design according to the cylinder head original model to obtain a sand core assembly model;

[0106] A deformation simulation subunit, used for performing deformation simulation on the sand core assembly model;

[0107] A model design subunit, used for designing a cylinder head model based on the sand core assembly model after the deformation simulation;

[0108] The model decomposition subunit is used to decompose the cylinder head model to obtain the airway model.

[0109] Optionally, the qualification judgment unit 304 includes:

[0110] A comparison subunit, used to compare the test result with a preset test value to determine whether the comparison result is within a deviation range;

[0111] If yes, the airway prototype is judged to be qualified;

[0112] If not, the airway prototype is judged to be unqualified.

[0113] Optionally, the performance index and the test result both include swirl ratio and flow coefficient.

[0114] Optionally, the optimization unit 305 includes:

[0115] A sand core model optimization subunit, used for optimizing the sand core assembly model to simultaneously optimize the airway model, and continuously performing a blowing experiment test on the airway prototype printed according to the airway model;

[0116] The original model optimization subunit is used to optimize the cylinder head original model to simultaneously optimize the airway model when the cumulative number of test failures reaches a preset number, until the test is qualified.

[0117] The embodiments in this specification are described in a progressive manner. As for the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the methods.

[0118] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0119] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0120] The features described in the embodiments of this specification can be replaced or combined with each other, so that professional and technical personnel in this field can implement or use the present application.

[0121] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for developing an airway based on selective laser melting technology, characterized in that: include: Using selective laser melting technology to print out the airway prototype according to the airway model; Disposing a strain gauge on the wall of the airway prototype; Performing a blowing test on the airway prototype to obtain test results and deformation of the strain gauge under high and low temperature conditions; Determine whether the airway prototype has passed the test according to the test result; If not, optimizing the airway model based on the test result and the deformation until the test is qualified; Before printing the airway prototype according to the airway model using the selective laser melting technology, the method further includes: Design the original model of the cylinder head; Performing CFD simulation on the cylinder head original model to evaluate whether the performance index of the air passage in the cylinder head original model meets the preset conditions; If yes, then obtaining the airway model according to the cylinder head original model; If not, optimizing the original cylinder head model until the performance index meets the preset condition; The step of acquiring the airway model according to the cylinder head original model comprises: Perform casting process design and sand core design according to the cylinder head original model to obtain a sand core assembly model; Performing deformation simulation on the sand core assembly model; Designing a cylinder head model based on the sand core assembly model after the deformation simulation; The cylinder head model is decomposed to obtain the airway model.

2. The method according to claim 1, characterized in that The step of judging whether the airway prototype is qualified according to the test result includes: Compare the test result with the test preset value to determine whether the comparison result is within the deviation range; If yes, the airway prototype is judged to be qualified; If not, the airway prototype is judged to be unqualified.

3. The method according to claim 1 or 2, characterized in that: The performance index and the test results both include swirl ratio and flow coefficient.

4. The method according to claim 1, characterized in that: The step of optimizing the airway model until the test is qualified comprises: Optimizing the sand core assembly model to simultaneously optimize the airway model, and continuously performing a blowing experiment test on the airway prototype printed according to the airway model; When the cumulative number of test failures reaches a preset number, the cylinder head original model is optimized to simultaneously optimize the airway model until the test is qualified.

5. An airway development device based on selective laser melting technology, characterized in that: include: Printing unit, strain gauge setting unit, testing unit, qualification judgment unit and optimization unit; The printing unit is used to print out an airway prototype according to the airway model using a selective laser melting technique; The strain gauge setting unit is used to set a strain gauge on the wall of the airway prototype; The testing unit is used to perform a blowing test on the airway prototype to obtain the test results and the deformation of the strain gauge under high and low temperature conditions; The qualified judgment unit is used to judge whether the airway prototype has passed the test according to the test result; The optimization unit is used to optimize the airway model until the test is qualified based on the test result and the deformation condition if no; The device also includes: Original model design unit, used to design the original model of the cylinder head; A performance index judgment unit, used to perform CFD simulation on the cylinder head original model to evaluate whether the performance index of the airway in the cylinder head original model meets the preset conditions; an airway model acquisition unit, configured to acquire the airway model according to the cylinder head original model; an original model optimization unit, for optimizing the original model of the cylinder head, if not, until the performance index meets the preset condition; The original model optimization unit comprises: A sand core model acquisition subunit is used to perform casting process design and sand core design according to the cylinder head original model to obtain a sand core assembly model; A deformation simulation subunit, used for performing deformation simulation on the sand core assembly model; A model design subunit, used for designing a cylinder head model based on the sand core assembly model after the deformation simulation; The model decomposition subunit is used to decompose the cylinder head model to obtain the airway model.

6. The device according to claim 5, characterized in that The qualification judgment unit comprises: A comparison subunit, used to compare the test result with a preset test value to determine whether the comparison result is within a deviation range; If yes, the airway prototype is judged to be qualified; If not, the airway prototype is judged to be unqualified.

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