Full three-dimensional part process design and correlation modeling method based on PMI model

Abstract

The invention relates to a full-three-dimensional part process design and correlation modeling method based on a PMI model, and the method comprises the steps: building a process model organization structure according to a process route, and enabling the process model organization structure to comprise a design model, a blank model and a process model corresponding to a part machining step, wherein the process model comprises a process inspection model, a process tool clamp model and a process simulation analysis model; according to the geometric evolution relationship of each process, creating an association relationship of the process models; determining inspection requirements of each sub-process, performing PMI labeling on the inspection model, and generating a bubble graph; carrying out numerical control detection programming according to the process inspection model; carrying out numerical control detection process simulation analysis; perfecting the working procedure tool clamp model according to related working procedure requirements; perfecting the process simulation analysis model according to related process requirements; carrying out numerical control machining programming according to the process simulation analysis model; carrying out combined process simulation analysis; and compiling a three-dimensional operation instruction book and a structured process file.

Description

Technical Field

[0001] The present invention relates to the field of aero-engine manufacturing, and in particular to three-dimensional process design and associative modeling of complex parts of aero-engines. Background Art

[0002] In the past few decades, the information transmission of industrial products has been in the form of two-dimensional drawings, from the initial hand-drawn drawings to the two-dimensional models of computer-aided design (CAD), and then to the two-dimensional drawings generated by the projection of three-dimensional solid models. Although breakthroughs have been made in design methods and design tools during the evolution process, there has been no substantial change in the final way of information transmission, which is simply the computerized application of manual two-dimensional drawings.

[0003] Traditional two-dimensional drawings contain the product's dimensions, tolerance requirements, material selection, process requirements, etc. All this information needs to be passed on to downstream by designers through the drawing of two-dimensional drawings, and readers need to use their own three-dimensional spatial composition imagination to reconstruct the two-dimensional information to form a three-dimensional concept. In most cases, there will be deviations in the conversion in the middle, resulting in inaccurate information transmission and unnecessary iterations. For complex spatial structures, it is very easy for misunderstandings to lead to out-of-tolerance scrapping.

[0004] In order to solve the problem of insufficient definition of two-dimensional drawings, the three-dimensional design mode has been basically realized in the field of aero-engine design. In recent years, the Model Based Definition (MBD) method has been introduced to completely replace two-dimensional engineering drawings. MBD is an advanced method for digital definition of products. It means that all kinds of information defined by products are organized in a modeled, structured and integrated manner. Its core content is the geometric model of the product. All relevant dimensional tolerances, technical requirements, materials and standards and related management information are attached to the three-dimensional model of the product. At present, this technology is only used in design units, and downstream manufacturing units still use two-dimensional or "two-dimensional as the main, three-dimensional as the auxiliary" process design mode. In this mode, the manufacturing unit first needs to manually convert the product manufacturing information (PMI) model into a two-dimensional engineering drawing. This method is not only inefficient, but also prone to conversion errors, and there are high quality risks.

[0005] On the other hand, the current modeling, automation and intelligence of advanced equipment at home and abroad are constantly deepening, and manufacturing units are gradually carrying out digital transformation. Therefore, various advanced digital equipment and software are constantly introduced. However, unstructured data such as two-dimensional drawings are difficult to support the application of these advanced digital equipment and software, resulting in extremely low utilization of automated equipment. Even in the process mode of "two-dimensional as the main and three-dimensional as the auxiliary", in order to meet the requirements of programming of some CNC machining and CNC inspection processes, the process designers of this process need to establish a process model separately. However, these process models are non-parametric models, and each model is independent of each other. Once the design and process changes occur, each process model needs to be manually changed one by one, which is inefficient and easy to miss; in addition, in the "two-dimensional as the main and three-dimensional as the auxiliary" mode, the application of three-dimensional models is not systematic, usually only two-dimensional drawings are maintained, and the technical status of process models is not controlled. Under the long life cycle research and development and service conditions of aircraft engine products, it is very easy to have inconsistent technical status between models and drawings. If consistency maintenance is emphasized, non-parametric modeling methods will bring very high difficulty to model maintenance.

[0006] In addition, the design requirements for aircraft engine parts are extremely high, and the materials are usually heat-resistant materials. The processing preparation cycle is long, the process types are many, the process route is long, the process division of labor is obvious, and the inspection types and quantities are large. Taking the nozzle assembly processing as an example, there are as many as hundreds of processing steps, involving casting, 3D printing, electric spark, laser welding, argon arc welding, brazing, spraying, air flow debugging, fuel flow debugging, fluorescence inspection, CT inspection, etc. There are more than a dozen unconventional processing and inspection jobs. Therefore, there are great differences in process design and management methods between aircraft engine products and other types of products.

[0007] Based on the above background, we hope to provide a novel full three-dimensional part process design and associative modeling method to improve the modeling, integration, automation and visualization level of each manufacturing link, strengthen the process simulation analysis and process data management capabilities, and achieve improved processing quality and manufacturing efficiency. Summary of the invention

[0008] This application designs a full three-dimensional part process design and associative modeling method based on the PMI model.

[0009] According to a first aspect of the present application, a full three-dimensional part process design and associative modeling method based on a PMI model is provided, comprising:

[0010] According to the process route, a process model organization structure is created, wherein the process model organization structure includes a design model, a blank model, and a process model corresponding to the part processing steps, wherein the process model includes a process inspection model, a process fixture model, and a process simulation analysis model;

[0011] According to the geometric evolution relationship of each process, the association relationship of the process model is created;

[0012] Determine the inspection requirements for each sub-process, annotate the inspection model with PMI and generate a bubble chart;

[0013] Carry out CNC inspection programming based on process inspection model;

[0014] Carry out simulation analysis of CNC testing process;

[0015] Improve the fixture model of the process according to the requirements of the relevant process;

[0016] Improve the simulation analysis model of the process according to the requirements of relevant processes;

[0017] Carry out CNC machining programming according to the process simulation analysis model;

[0018] Conduct joint process simulation analysis;

[0019] Prepare three-dimensional work instructions and structured process documents.

[0020] This Summary is provided to introduce some concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to describe the manner in which the above and other advantages and features of the present invention can be obtained, a more particular description of the invention briefly described above will be presented by reference to specific embodiments of the invention shown in the accompanying drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings, in which:

[0022] Figure 1 It is a schematic flow chart of a method for full three-dimensional part process design and associative modeling according to an embodiment of the present application.

[0023] Figure 2 It is a schematic diagram of the hierarchical relationship of the process model organizational structure according to an embodiment of the present application.

[0024] Figure 3 It is a schematic diagram of the geometric association of a process model according to an embodiment of the present application.

[0025] Figure 4 is a schematic diagram of a process model according to an embodiment of the present application.

[0026] Figure 5It is a schematic diagram of a three-dimensional work instruction according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] Before describing the solution of this application, the following relevant terms (in Chinese and English) and their explanations are introduced:

[0028] PMI (Product Manufacturing Information): Product manufacturing information. The PMI model is used to completely replace traditional two-dimensional engineering design drawings, including geometric information such as product points, lines, surfaces, and bodies, and non-geometric information such as dimensional tolerances, technical requirements, materials and standards, and related management attributes.

[0029] Part Process Model: The main object of three-dimensional process design, including the models of each process, inspection models, and simulation analysis models in the processing and production process, which are used to carry out various process design, CNC programming, simulation analysis, CNC testing, etc.

[0030] Associated Modeling: Establish geometric and non-geometric associations between part process models. Changes to the elements of the parent model drive the update of the elements of the child model.

[0031] As mentioned above, current manufacturing units generally adopt 2D or "2D-based, 3D-assisted" process mode, which has the following problems:

[0032] 1. Two-dimensional drawings are not conducive to the expression of complex products, and it is very easy to cause out-of-tolerance scrapping due to misunderstandings. The PMI model conversion method is inefficient and prone to errors, and there are high quality risks;

[0033] 2. The two-dimensional image is unstructured data, which cannot meet the current requirements of digital equipment and software for each process, and the degree of equipment automation is low;

[0034] 3. The process route of aircraft engine parts is long, the division of labor is obvious, the model application system is missing, and the independent non-parametric modeling method between each process is prone to repeated modeling, and the change efficiency is extremely low;

[0035] 4. Aviation products have a long life cycle. When the model is separated from the two-dimensional drawing, the technical status of the model is uncontrolled, posing a huge quality risk.

[0036] In order to overcome these problems, this application designs a full three-dimensional part process design and associated modeling method based on the PMI model. It directly uses the PMI model of the design unit to carry out process model associated modeling, and adopts a model-based definition method to define product manufacturing information. It meets the application requirements of CNC programming, tooling design, process simulation analysis, etc. in the process design of each process on the manufacturing end, and improves the change efficiency and technical status management level.

[0037] In general, the solution of this application has the following innovative features:

[0038] 1) The present application provides a full three-dimensional part process design and associated modeling method based on the PMI model. By using the PMI model to directly carry out full three-dimensional process design, there is no need to convert the three-dimensional data model on the design side, thereby reducing the error probability in the drawing conversion process and improving the quality of process design. In addition, it can also intuitively guide the processing of each process and reduce the probability of deviation caused by ambiguity in the understanding of the complex spatial structure of the product.

[0039] 2) This application provides a full three-dimensional part process design and associated modeling method based on the PMI model. By adopting the model-based product definition (MBD) method in the process of process design information definition, according to the internationally advanced ASME-Y14 series digital product definition standards, a product manufacturing information model for each process is established, which can directly drive the automatic programming of CNC machining and CNC inspection software, greatly improving the automation efficiency of CNC machining and CNC inspection.

[0040] 3) The present application provides a full three-dimensional part process design and associative modeling method based on the PMI model. By establishing an associative relationship between the design model and all process-related data models such as process models, process inspection models, process simulation analysis models, and process tooling models, in addition to geometric information associations such as points, lines, surfaces, and bodies, non-geometric information associations such as dimensional tolerances, technical requirements, materials and standards, and related management attributes are also established. After the PMI model on the upstream design end is changed, the downstream related models can automatically update the geometric and non-geometric information according to the associative relationship, thereby greatly improving the change efficiency.

[0041] 4) The present application provides a full three-dimensional part process design and associative modeling method based on the PMI model. By establishing a process model according to the process route, an accurate data model can be provided for each sub-process, thereby improving the simulation analysis accuracy of each process. A single data source management method is adopted, and each process uses the process model as the only data source, and integrated version control is performed to solve the problems of process data dispersion and technical status management difficulties under the long life cycle of aircraft engine products.

[0042] Combine the following Figure 1The following specifically describes a method for full three-dimensional part process design and associative modeling according to an embodiment of the present application.

[0043] As shown in the figure, in step 1, a process model organizational structure is created based on the process route.

[0044] Specifically, the steps include: first, based on the PMI model released by the design end, the dimension tolerance information in the PMI model is marked according to the international GD&T standard. Then, in the CAD software, according to the process route, the Figure 2 The process model organization structure is shown.

[0045] The process model of the present application includes a design model, a blank model and a process model corresponding to the part processing steps, wherein the process model includes a process inspection model, a process tooling and fixture model and a process simulation analysis model.

[0046] The design model refers to the part processing file issued by the design unit to the manufacturing unit. It is usually a three-dimensional data model containing PMI and is the basis for the final delivery and acceptance of the parts.

[0047] The blank model refers to the three-dimensional data model containing PMI compiled by the design unit or manufacturing unit, which is the basis for the final delivery and acceptance of the blank.

[0048] Among them, the design model, blank model and process model corresponding to the part processing steps in the process model establish their logical association relationship through the assembly and part body association method in the CAD software. The process inspection model, process fixture model and process simulation analysis model in the process model establish their logical association relationship through the assembly and part body association method in the CAD software.

[0049] By constructing a process model organization structure with the above-mentioned logical association relationship, the centralized management of multiple models in the process model can be effectively realized, avoiding the failure of subsequent geometric associations in the CAD software due to changes in storage locations.

[0050] Specifically, if Figure 2 As shown in the figure, the process model of each process in the process is represented as an assembly in the CAD software, which is composed of parts such as the inspection model of the process, the process fixture model and the process simulation analysis model. The relationship between the design model and each process model is established through the relationship between the assembly and the parts in the CAD software.

[0051] Among them, the process inspection model defines the geometric model information and other non-geometric information such as dimensional tolerance, form and position tolerance required for the inspection of parts in this process, and stipulates the final geometric shape and manufacturing requirements after the completion of this process. It is the basis for process personnel or inspection personnel to carry out inspection process preparation and CNC inspection program preparation. The geometric model information of the inspection model is obtained by reusing the geometric model of the previous process model (the previous process model of the first process model is the blank model), and removing the processed shape contour of this process through geometric trimming and other methods on the basis of this model. The non-geometric information of the inspection model needs to be directly reused in the part model inspected in this process. The rest of the parts are newly marked according to the international GD&T standard.

[0052] The process fixture model defines the geometric model information of the fixtures related to the parts of this process, as well as other non-geometric information such as dimensional tolerances, form and position tolerances, and is the basis for fixture design and manufacturing personnel to carry out fixture design, fixture simulation analysis, and fixture processing and manufacturing. The initial fixture model only includes the geometric information required for the clamping and positioning of the parts of this process, and its composition is usually in the form of geometric elements such as points, lines, and surfaces. These geometric element information is obtained by directly reusing the geometric model information in the inspection model of this process. When the process fixture model is finally released, it includes all manufacturing information marked in accordance with the international GD&T standard.

[0053] The process simulation analysis model includes various structured information such as NC machining programming and tool path simulation analysis created based on the inspection model of this process. It is the basis for NC machining simulation analysts to carry out NC machining process compilation and NC machining program compilation. The initial process simulation analysis model is obtained by reusing the inspection model of this process. Then, based on this geometric information, NC machining simulation analysts add various structured information according to the requirements of NC machining programming software and NC simulation analysis software. Usually, this model includes NC machining tool information, machining trajectory and other information.

[0054] It should be understood that the process fixture model and process simulation analysis model in the process model organization structure created in step 1 are only a framework, and the necessary information must be entered to complete it, which will be mentioned in the following steps.

[0055] After the process model organization structure is created, in step 2, the association relationship of the process model is created according to the geometric evolution relationship of each process.

[0056] The geometric evolution relationship of each process in the process model in this application refers to the evolution of the geometric shape determined by the material removal process of each process in the actual processing of the parts during the processing from the blank model to the process model, that is, the process inspection model of the current process obtained by removing the processed geometric features of the current process on the basis of the previous process inspection model.

[0057] refer to Figure 3 , which shows a schematic diagram of the geometric association of a process model. From this figure, it can be found that the geometric association can include the following three types:

[0058] 1) The geometric association between the design model and the blank model and each process model. As mentioned above, in the process from the blank model to each process model, according to the part material removal process, the process inspection model of the current process can be obtained by removing the processed geometric features of the current process on the basis of the previous process inspection model. The appearance of the geometric features in the process inspection model of the current process and the geometric contours of the processed features in the design model of the current process can usually be established by associating surface elements (that is, in CAD software, by associating planes, surfaces or sheets). By using this geometric association between the geometric features of the design model and each process model, the geometric consistency between them can be maintained, that is, the designer only needs to modify the geometric contour of a process in the design model, and then the geometric features in the process inspection model of the corresponding process model will automatically change accordingly, without the need for the designer to modify it manually.

[0059] 2) Geometric association between the process inspection model, the process fixture model and the process simulation analysis model: The geometric contour required in the initial fixture model of this process and the geometric contour of the process inspection model are geometrically associated by means of surface element association; the initial process simulation model of this process and the process inspection model are geometrically associated by means of body element association (i.e., in CAD software, by means of associating geometric bodies);

[0060] 3) Geometric association between the inspection model of the previous process and the inspection model of this process: The initial geometric contour of the inspection model of this process and the final contour of the inspection model of the previous process are used to establish the geometric association between the inspection model of the previous process and the inspection model of this process through body element association.

[0061] In addition to the "geometric associations between the design model and the blank model and each process model", the "geometric associations between the current process inspection model and the process fixture model and the process simulation analysis model" and "geometric associations between the previous process inspection model and the current process inspection model" are provided for the purpose of considering the robustness of the association. If only the direct association of "geometric associations between the design model and the blank model and each process model" is used, then if the upstream feature disappears, it means that all subsequent updates of the dependent features will fail. The direct result is that the CAD software will report errors on the entire screen, and it is impossible to analyze where to make changes. This problem is very common in associative modeling. However, if proper isolation is performed, the association is not only the overall (geometric association between the process inspection model and the process inspection model) but also the local (geometric association between the process inspection model and the process fixture model and the process simulation analysis model). Then, when updating, the changes in the features will be passed down step by step, and the internal update failure can be avoided from being directly passed to the next level, which greatly increases the robustness of the association relationship.

[0062] By establishing geometric associations between the design model and the blank model, the design model and the process inspection model, the previous process inspection model and the current process inspection model, the process inspection model and the process tooling and fixture model, and the process inspection model and the process simulation analysis model, it can be achieved that when the geometric elements of the design model are changed, the relevant geometric features in the process model can be automatically updated in real time according to the correctly defined association relationship, avoiding the problems of inefficiency, error-proneness, low precision and so on of manual modeling adjustment.

[0063] Specifically, according to the geometric evolution relationship of each process, the associative modeling function of the CAD software is used to create the geometric association between the design model and the blank model and each process model, the geometric association between the previous process model and the current process model, the geometric association between the process inspection model and the process tooling and fixture model, and the geometric association between the process inspection model and the process simulation analysis model.

[0064] After creating the association relationship of the process model, go to step 3 to determine the inspection requirements of each sub-process, and perform PMI annotation on the process inspection model and generate a bubble chart.

[0065] Specifically, process designers can determine the inspection requirements for each sub-process according to the process design requirements, referring to Figure 4The process model shown can be marked with PMI in the process inspection model in the CAD software according to the international GD&T standard, including dimensional tolerances, technical requirements, materials and standards and related management attributes, and the dimensional tolerances and technical requirements are numbered to generate a bubble chart. In addition, the materials, standards and related management attributes are mapped to the process design platform. The PMI information in the process inspection model needs to completely include the measured elements, evaluation methods and evaluation standard information. The measured elements need to accurately specify the points, lines and surfaces associated with the inspected dimensions in the CAD software. The evaluation method needs to specify the inspection type in the CAD software, such as selecting evaluation methods such as coaxiality, contour, and linear dimensions. The evaluation standard needs to specify the tolerance range information in the CAD software.

[0066] Then, in step 4, CNC inspection programming is carried out based on the process inspection model.

[0067] Specifically, when compiling the inspection program, the inspector performs the following steps: import the process inspection model with complete PMI information into the CNC inspection programming software, configure the initial data such as the three-coordinate machine and the probe, set the correct working coordinate system according to the workpiece in the CNC inspection compilation software, and then parse the geometric model and various dimensional tolerance information in the process inspection model. In this way, the CNC inspection programming software can automatically generate the inspection path code based on the above information. Subsequently, the inspector can check the code item by item and optimize the inspection parameters.

[0068] Next, in step 5, a simulation analysis of the CNC inspection process is carried out.

[0069] Specifically, the inspectors import geometric models such as process inspection models, process tooling and fixture models, and CNC inspection equipment models into the CNC inspection simulation analysis software, add CNC program codes to carry out CNC inspection path simulation analysis, check whether the probe trajectory interferes with each geometric model and whether the inspection trajectory is efficient, and then further optimize the CNC inspection program code based on the simulation analysis results.

[0070] Then, in step 6, the process tooling and fixture model is improved according to the relevant process requirements.

[0071] Specifically, tooling designers carry out tooling structure design and improve process tooling fixture models based on process models and related process requirements. The positioning reference, installation surface, and external contour in the process tooling fixture model need to reuse the geometric elements of the inspection model in the process inspection model to ensure the correlation between the contours of the previous and current process models. Finally, other information required for the manufacturing of the process tooling fixture model is marked according to international GD&T standards.

[0072] Next, in step 7, the process simulation analysis model is improved according to the relevant process requirements.

[0073] Specifically, the process simulation analyst imports the process simulation analysis model into the CNC programming software, and performs simulation analysis pre-processing on the geometric features of the process simulation model according to the requirements of the simulation analysis software, such as creating, splitting, or simplifying the geometric features on the process simulation analysis model.

[0074] Then, in step 8, CNC machining programming is carried out based on the process simulation analysis model.

[0075] Specifically, the process simulation analysts continue to set the coordinate system, machine tool, tool and other information in the CNC programming software, and then generate tool trajectories based on the various geometric features and PMI information of the workpiece, and form CNC machining codes after preliminary optimization.

[0076] Next, in step 9, a joint process simulation analysis is carried out.

[0077] Specifically, process simulation analysts import CNC machining program codes, process simulation analysis models, process tooling models, CNC machining equipment models and other data into CNC machining simulation analysis software, analyze and optimize CNC machining paths, cutting parameters and other contents, and output the final version of the CNC machining program code.

[0078] Finally, in step 10, three-dimensional work instructions and structured process documents are compiled.

[0079] Specifically, the process personnel compile structured process texts in the 3D process design platform, and insert the inspection model containing PMI information, process fixture model and other schematic 3D models of the corresponding process into the structured process texts, and output e.g. Figure 5 The three-dimensional work instructions shown are used to guide operators in processing, wherein the operators can perform operations such as cutting, scaling, rotating, and switching views on the three-dimensional model views in the figure.

[0080] By utilizing the full three-dimensional part process design and associative modeling method based on the PMI model of this application, by establishing a process model according to the process route, an accurate data model can be provided for each sub-process, thereby improving the simulation analysis accuracy of each process; a single data source management method is adopted, each process uses the process model as the only data source, and integrated version control is performed to solve the problems of process data dispersion and technical status management difficulties under the long life cycle of aircraft engine products.

[0081] The solution of the present application may have the following advantages:

[0082] 1. The present application provides a full three-dimensional part process design and associated modeling method based on the PMI model. By using the PMI model to directly carry out full three-dimensional process design, there is no need to perform any conversion on the three-dimensional data model on the design side, thereby reducing the probability of errors in the drawing conversion process and improving the quality of process design. In addition, it can also intuitively guide the processing of each process and reduce the probability of deviations caused by ambiguity in the understanding of the complex spatial structure of the product.

[0083] 2. This application provides a full three-dimensional part process design and associated modeling method based on the PMI model. By adopting the model-based product definition (MBD) method in the process of process design information definition, according to the internationally advanced ASME-Y14 series digital product definition standards, a product manufacturing information model for each process is established, which can directly drive the automatic programming of CNC machining and CNC inspection software, greatly improving the automation efficiency of CNC machining and CNC inspection.

[0084] 3. The present application provides a full three-dimensional part process design and associative modeling method based on the PMI model. By establishing an associative relationship between the design model and all process-related data models such as process models, process inspection models, process simulation analysis models, and process tooling models, in addition to geometric information associations such as points, lines, surfaces, and bodies, non-geometric information associations such as dimensional tolerances, technical requirements, materials and standards, and related management attributes are also established. After the PMI model on the upstream design end is changed, the downstream related models can automatically update the geometric and non-geometric information according to the associative relationship, thereby greatly improving the change efficiency.

[0085] 4. The present application provides a full three-dimensional part process design and associative modeling method based on the PMI model. By establishing a process model according to the process route, it can provide an accurate data model for each sub-process and improve the simulation analysis accuracy of each process. It adopts a single data source management method, and each process uses the process model as the only data source, and performs integrated version control to solve the problems of process data dispersion and technical status management difficulties under the long life cycle of aircraft engine products.

[0086] Although various embodiments are described above, it should be understood that they are intended to be exemplary rather than limiting. Those skilled in the relevant art(s) will appreciate that various modifications may be made in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims. Therefore, the breadth and scope of the present invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should only be defined in accordance with the appended claims and their equivalents.

Claims

1. A full three-dimensional part process design and associative modeling method based on a PMI model, comprising: According to the process route, a process model organization structure is created, wherein the process model organization structure includes a design model, a blank model, and a process model corresponding to the part processing steps, wherein the process model includes a process inspection model, a process fixture model, and a process simulation analysis model; According to the geometric evolution relationship of each process, the association relationship of the process model is created; Determine the inspection requirements for each sub-process, annotate the inspection model with PMI and generate a bubble chart; Carry out CNC inspection programming based on process inspection model; Carry out simulation analysis of CNC testing process; Improve the fixture model of the process according to the requirements of the relevant process; Improve the simulation analysis model of the process according to the requirements of relevant processes; Carry out CNC machining programming according to the process simulation analysis model; Conduct joint process simulation analysis; Prepare three-dimensional work instructions and structured process documents.

2. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 1, characterized in that: The process model of each process in the process is represented as an assembly, which is composed of the process inspection model, process tooling and fixture model and process simulation analysis model of the process.

3. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 1, characterized in that: in: The design model refers to the part processing file issued by the design unit to the manufacturing unit, including the three-dimensional data model of PMI, which is the basis for the final delivery and acceptance of the parts; The blank model refers to a three-dimensional data model containing PMI compiled by the design unit or manufacturing unit, which is the basis for the final delivery and acceptance of the blank; The process inspection model defines the geometric model information and other non-geometric information such as dimensional tolerance, form and position tolerance required for the inspection of the parts in this process, and specifies the final geometric shape and manufacturing requirements after the processing of this process is completed; The process fixture model defines the geometric model information of the fixture related to the parts of this process, as well as other non-geometric information such as dimensional tolerance, form and position tolerance, etc. The process simulation analysis model includes various structured information such as numerical control machining programming and tool path simulation analysis created based on the process inspection model.

4. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 1, characterized in that: The geometric evolution relationship of each process refers to the evolution of the geometric shape determined by the material removal process of each process in the actual processing of the part during the processing from the blank model to each process model.

5. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 1, characterized in that: The association relationship includes: The design model is geometrically associated with the blank model and each process model respectively, wherein the outer shape of the geometric features of the process inspection model of the current process and the geometric contour of the features to be processed in the design model in the current process are associated with each other through surface elements to establish the geometric association between the design model and the process model; The geometric association between the process inspection model and the process fixture model, wherein the geometric contour required in the process initial fixture model and the geometric contour of the process inspection model are associated with each other through surface elements to establish the geometric association between the process inspection model and the process fixture model; The geometric association between the process inspection model and the process simulation analysis model, wherein the geometric association between the process initial process simulation model and the process inspection model is established by means of body element association; The geometric association between the previous process inspection model and the current process inspection model, wherein the initial geometric contour of the current process inspection model and the final contour of the previous process inspection model are established by body element association to establish the geometric association between the previous process inspection model and the current process inspection model.

6. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 5, characterized in that: By establishing geometric associations between the design model and the blank model, between the design model and the process inspection model, between the previous process inspection model and the current process inspection model, between the process inspection model and the process tooling and fixture model, and between the process inspection model and the process simulation analysis model, when the geometric elements of the design model change, the relevant geometric features in the process model are automatically updated in real time based on the correctly defined association relationships.

7. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 1, characterized in that: The steps of determining the inspection requirements for each sub-process, marking the inspection model with PMI and generating a bubble chart include: Determine the inspection requirements for each sub-process according to the process design requirements; Mark the process inspection model with PMI in CAD software according to international GD&T standards, including dimensional tolerances, technical requirements, materials and standards and related management attributes, number the dimensional tolerances and technical requirements, and generate bubble charts; and A mapping relationship is established between materials, standards and related management attributes and the process design platform.

8. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 1, characterized in that: The simulation analysis of the numerical control detection process includes: The inspector imports the process inspection model, the process tooling and fixture model, the CNC inspection equipment model and other geometric models into the CNC inspection simulation analysis software, adds CNC program code to carry out CNC inspection path simulation analysis, checks whether the probe trajectory interferes with each geometric model, and whether the inspection trajectory is efficient, and then further optimizes the CNC inspection program code based on the simulation analysis results.

9. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 1, characterized in that: The CNC machining programming carried out according to the process simulation analysis model includes: In the CNC programming software, process simulation analysts set the coordinate system, machine tool, and tool information in sequence, and then generate tool paths based on the various geometric features and PMI information of the workpiece, forming CNC machining codes after preliminary optimization.

10. The full three-dimensional part process design and associative modeling method based on the PMI model as claimed in claim 9, characterized in that: The joint process simulation analysis includes: The process simulation analyst imports the CNC machining program code, the process simulation analysis model, the process tooling model, the CNC machining equipment model and other data into the CNC machining simulation analysis software, analyzes and optimizes the CNC machining path and cutting parameters, and outputs the final version of the CNC machining program code.

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