Rapid Process Design Method for Shell Parts

Abstract

This application relates to a rapid process design method for shell-like parts. It mainly classifies the designed shell parts, inductively classifies the design features and manufacturing features, establishes the manufacturing feature system and its attributes of the shell parts, designs a detailed process model, establishes corresponding refined typical processes, and forms an example knowledge base; according to the category and refined typical processes of the shell parts to be designed, combines the part manufacturing process sets to form the manufacturing process of the shell parts to be designed, realizes the reuse of typical processes, thereby achieving the purpose of rapid and efficient process design, effectively improving the degree of process standardization, and improving the process design efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of machining, and relates to a rapid process design technology for shell parts during the manufacturing process. Background Art

[0002] At present, when designing the process plan for shell parts, process engineers basically design according to the product drawings, using their professional knowledge, combined with the production organization, equipment and technical status where they are located, and the production batch. Due to the differences in the knowledge composition, technical qualities, experience accumulation, and thinking scopes of different process designers, when designing the process, the formulation of the process plan, the selection of process parameters, etc. are relatively arbitrary, resulting in different process design plans for the same or similar parts designed by different process designers, with a low degree of process standardization. This not only increases a large amount of repetitive labor, but also leads to the complication of production planning and organizational management. At the same time, due to the lack of full utilization of the original process information, the efficiency of process manufacturing design is also reduced, making it difficult for the process design to achieve the goals of high efficiency and rationality. Summary of the Invention

[0003] In order to overcome the technical problems existing in the prior art, the present application provides a rapid process design method for shell parts.

[0004] For the numerical control machining process of shell parts, the present application analyzes the structures and process characteristics of typical parts, establishes a manufacturing feature system and machining knowledge oriented to manufacturing features (including process methods, tools, machining parameters, etc.), establishes the mapping correlation relationship between typical processes and features, and establishes a feature machining process decision knowledge base. According to the overall information, technical requirements, key feature information, etc. of the part, typical process plans and typical process specifications are matched, and information such as the process plan and process specification is revised to complete the refined design of the process based on features, the optimization of process parameters, and the process design based on model recognition analysis, realizing the reuse of typical processes, so as to achieve the purpose of rapid and efficient process design.

[0005] The technical solution adopted by the present application is as follows:

[0006] A rapid process design method for shell parts, which includes the following steps:

[0007] 1) Classify the shell parts.

[0008] 2) Inductively classify the design features and manufacturing features of the shell parts.

[0009] 3) Establish a manufacturing feature system and its attributes for the shell parts, determine the mapping relationship with the design features and geometric features, determine the manufacturing feature information, and complete the feature modeling of the shell parts.

[0010] 4) Model according to the characteristics of the shell parts and design a detailed process model;

[0011] 5) Based on the detailed process model and combined with the manufacturing characteristics of the shell parts, establish corresponding fine typical processes and form an example knowledge base;

[0012] 6) Based on the feature modeling of the shell parts, extract the design features of the part model. According to the mapping relationship between the design features and the manufacturing features, form the manufacturing feature family of the shell parts to be designed; combined with the fine typical processes of the shell parts to be designed, match the manufacturing features and the process, complete the selection of the processing method and the transfer of parameters, and form the part manufacturing process set; furthermore, according to the category and fine typical processes of the shell parts to be designed, combine the part manufacturing process set to form the manufacturing process of the shell parts to be designed.

[0013] Further limit that the step (1) is specifically: classify the geometric structure of the shell parts according to the main structure, process characteristics and main equipment used, find the rules from the aspects of function, composition of process characteristics and similarity of equipment used, and summarize and classify the types of shell parts.

[0014] Further limit that the types of the shell parts are divided into: box-type shells, disc-type rotary shells, tank-type rotary shells, lid-type shells, and special-type shells.

[0015] Further limit that the design features of the shell parts in the step (2) are summarized as: connection form, functional interface, sealing form, sectionalization of functional component hole systems, and oil circuit.

[0016] Further limit that the manufacturing features of the shell parts in the step (2) are summarized as: milling, point machining, turning, and special machining.

[0017] Further limit that the step (2) is specifically:

[0018] (2.1) Combine and summarize according to the geometric structure of the shell parts and the specific geometric elements of the machining features to obtain specific design features;

[0019] (2.2) Combine the design features of the shell parts, analyze and summarize the shell structure and process, find the rules from the geometric similarity and process method similarity of the shell parts, and summarize the manufacturing features of the designed shell parts;

[0020] (2.3) Classify the manufacturing features of the shell parts according to the functional characteristics and manufacturing characteristics and encode the classified manufacturing features.

[0021] Further limit that the step (3) is specifically:

[0022] (3.1) Select typical shells according to the product series, focus on key factors, overall consider the remaining auxiliary factors to sort out typical features, establish a manufacturing feature system and its attributes covering complex and precision shell parts, and determine the mapping relationships between them and design features and geometric features;

[0023] (3.2) Determine the manufacturing feature information of the shell parts, where the manufacturing feature information includes shape dimensions and tolerances, position dimensions and tolerances, roughness, heat treatment requirements, and surface hardness;

[0024] (3.3) Establish a feature model of the shell parts, determine the extraction technologies and tools for manufacturing feature information, and extract the manufacturing feature information, overall part information, and PMI information of complex and precision shell parts;

[0025] (3.4) Sort out the feature machining knowledge logic according to manufacturing feature modeling, and formulate the knowledge structure of feature machining process decision-making.

[0026] Further define that the specific content of step (4) is as follows:

[0027] (4.1) Based on the shell part information, process information, and manufacturing feature information, use the feature machining process decision-making knowledge to establish a feature-based detailed process design process model;

[0028] (4.2) Establish a feature machining process decision-making knowledge base, mainly including feature machining process method decision-making, feature machining tool parameter design, feature machining - process information matching, feature machining tool selection, and feature machining process parameter selection;

[0029] (4.3) Perform secondary development on the detailed process design process model of the shell part features according to the specific application system. By defining the feature decision-making elements in the process design process, realize the call of feature-based detailed process design, and directly generate the process content corresponding to the features.

[0030] Further define that the feature machining process method decision-making includes the decision-making of machining method chains, local surface treatment, and machining allowances to generate feature machining units; the feature machining tool parameter design includes tool types, materials, dimensions, and cutting edge parameters; the feature machining - process information matching is to establish the association relationship between processes and feature machining according to process information, and generate machining steps according to tool information; the feature machining tool selection is to perform intelligent matching queries with the tool database based on tool parameters, and determine the selected tool through human-computer interaction; the feature machining process parameter selection is to determine the cutting parameters based on the feature machining information, part, machine tool, and tool-related information, and the cutting parameters include cutting depth, width, spindle speed, feed rate, and feed mode, providing detailed parameter information for numerical control programming.

[0031] Further define that the step (5) is specifically as follows:

[0032] (5.1) According to the classification of shell part categories, summarize the basic process contents of the rough machining, semi-finishing machining, and finishing machining processes for various shell parts;

[0033] (5.2) Further subdivide according to the structure, characteristics, materials, dimensions, precision, heat treatment, and technical requirements of various parts to form more precisely similar part categories, establish corresponding more accurate and refined typical processes, and determine their selection conditions and constraint rules;

[0034] (5.3) Form an example knowledge base according to the example knowledge model structure.

[0035] Compared with the prior art, the beneficial effects of this application are as follows:

[0036] This application analyzes the structures and process characteristics of typical components through the numerical control machining process of shell parts, establishes a design feature system, a manufacturing feature system, and machining knowledge oriented to manufacturing features (including process methods, tools, machining parameters, etc.), establishes the mapping relationship between the design feature system and the manufacturing features, and the mapping correlation relationship between the typical process and the manufacturing features, and establishes a feature machining process decision knowledge base. According to the overall information of the part design model, technical requirements, key feature information, etc., match the manufacturing features, and then match the typical process plan and typical process specification, and revise the information such as the process plan and process specification to complete the feature-based process refinement design, process parameter optimization, and process design based on model recognition and analysis, realize the reuse of typical processes, so as to achieve the purpose of fast and efficient process design, and further make the shell parts more convenient and smooth in the process manufacturing design, effectively improve the process standardization level, improve the process design efficiency, and at the same time fully accumulate and inherit the experience of experts in the professional technical field, so that the process design of shell parts no longer completely depends on personal experience. Description of the Drawings

[0037] Figure 1 It is a product design feature classification method. Detailed Embodiments

[0038] Now, the technical solution of this application will be further described in combination with the drawings and embodiments.

[0039] Step 1: Classify the shell parts

[0040] For shell parts, classify the geometric structure of the shell according to the main structure, technological characteristics, and main equipment used. Find the rules from the aspects of function, composition of technological characteristics, and similarity of equipment used, and summarize and classify the categories of shell parts. They are mainly divided into box-shaped shell parts, disc-shaped rotary shell parts, tank-shaped rotary shell parts, lid-shaped shell parts, special-shaped shell parts, etc. See Table 1 for the classification of shell parts, and the specific classification is as follows:

[0041] Table 1 Classification of Shell Parts

[0042]

[0043] Step 2: Summarize and classify the design features and manufacturing features of the shell parts;

[0044] Shell parts have complex structures, many internal cavities, and uneven wall thicknesses. The lengths of the oil passage hole systems are different and the quantities are numerous. The sizes and depths of the threaded hole systems are different, and the geometric feature similarity is not high. Therefore, the functional feature classification method is used for feature summarization. Classify the geometric structure of the parts according to function, find the rules from the functional similarity, and summarize the functional features of the product parts; combine the specific geometric structures of the functional features of the product parts obtained with the specific geometric elements of the machining features to obtain the specific product design features oriented to manufacturing. A total of 5 categories of product design features, including connection form, functional interface, sealing form, segmented hole system of functional components, and oil circuit, are summarized, and each category of features is further refined according to function and structure. See Figure 1 .

[0045] The features oriented to manufacturing are the carriers that organically combine the geometric information and machining information of the parts. Through the analysis of the structure and technology of the shell parts, the typical manufacturing features of complex shell parts are divided into four categories according to the geometric similarity and processing methods of the shell parts, including mainly milling machining (such as features like cavities, profiles, curved surfaces, grooves, etc.), mainly point machining (such as features like oil passage holes, stud through holes, threaded holes, pin holes, small mounting hole systems below Ф20, etc.), mainly turning machining (such as features like complex hole systems above Ф20 and large mounting hole systems, etc.), and special machining (such as features like special-shaped grooves, etc.).

[0046] That is, the implementation of Step 2 specifically includes the following steps:

[0047] 2.1) Combine and summarize according to the geometric structure of the shell parts and the specific geometric elements of the machining features to obtain the specific design features;

[0048] 2.2) Combine the design features of the shell parts, analyze and summarize the structure and technology of the shell parts, find the rules from the geometric similarity and process method similarity of the parts, and summarize and classify the product manufacturing features;

[0049] 2.3) Classify the manufacturing features of the housing parts according to functional characteristics and manufacturing characteristics, and code the classified manufacturing features. The classified manufacturing features are: stud on plain threaded hole, AG stud hole Ⅰ for steel screwed into aluminum, stud through hole, threaded bush hole, cylindrical pin hole, oil circuit rotary pipe joint interface, oil circuit straight pipe joint / plug interface, air circuit rotary pipe joint, plain thread, mounting hole Ⅰ, mounting hole Ⅱ, end face seal, British thread, end face rubber ring seal groove, chamfer, mounting hole Ⅲ, inner hole ring groove, oil circuit hole, plug mounting hole, groove machining, mounting hole Ⅳ, mounting hole Ⅴ, mounting Ⅵ, mounting hole Ⅶ, mounting hole Ⅷ, mounting hole Ⅸ, general hole machining, 2D milling machining, and housing outer shape machining.

[0050] Step 3: Establish the manufacturing feature system and its attributes of the complex precision housing parts, determine the mapping relationships with design features and geometric features, determine the manufacturing feature information, and complete the feature modeling of the complex precision housing parts.

[0051] Select typical housings according to the product series, pay attention to key factors, overall plan the remaining auxiliary factors to sort out the typical features, establish the manufacturing feature system and its attributes covering complex housing parts, and determine the mapping relationships with design features and geometric features. The manufacturing feature information mainly includes four aspects: the mapping relationships between manufacturing features and design features, geometric features; the shape dimensions, precision, position dimensions, precision, and roughness of manufacturing features; the performance requirements such as heat treatment requirements and surface hardness; and other process technology requirements.

[0052] It includes the following steps:

[0053] 3.1) Establish the manufacturing feature system and its attributes covering complex housing parts according to the product manufacturing features, and determine the mapping relationships with design features and geometric features.

[0054] 3.2) Determine the manufacturing feature information, including shape dimensions and precision, position dimensions and precision, roughness; heat treatment requirements, performance requirements such as surface hardness; and other process technology requirements.

[0055] 3.3) Develop the manufacturing feature information extraction technology and tools for the model to realize the extraction of manufacturing feature information, overall part information, PMI information, etc. of complex precision housing parts.

[0056] 3.4) Sort out the feature processing knowledge logic according to the manufacturing feature modeling, and formulate the knowledge structure of feature processing process decision-making.

[0057] Step 4: Design a detailed process model according to the feature modeling of the complex precision housing parts;

[0058] Based on part information, process information, and manufacturing feature information, using feature machining process decision-making knowledge, conduct a detailed process design process based on features. It mainly includes decision-making on feature machining process methods, design of feature machining tool parameters, matching of feature machining - process information, selection of feature machining tools, selection of feature machining process parameters, etc., to form a feature machining process knowledge base and a detailed process design process based on features.

[0059] It includes the following steps:

[0060] 4.1) Based on the shell part information, process information, and manufacturing feature information, using feature machining process decision-making knowledge, establish a detailed process design process model based on features;

[0061] 4.2) Establish a feature machining process decision-making knowledge base, mainly including decision-making on feature machining process methods, design of feature machining tool parameters, matching of feature machining - process information, selection of feature machining tools, selection of feature machining process parameters, etc.;

[0062] Decision-making on feature machining process methods includes decisions such as machining method chains, local surface treatment, and machining allowances, and generates feature machining units;

[0063] Design of feature machining tool parameters includes tool types, materials, dimensions, cutting edge parameters, etc.;

[0064] Matching of feature machining - process information: According to the process information, establish the association relationship between the process and feature machining, and generate machining steps, etc. according to the tool information;

[0065] Selection of feature machining tools: Based on the tool parameters, conduct intelligent matching queries with the tool database, and determine the selected tool through human - machine interaction;

[0066] Selection of feature machining process parameters: Based on feature machining information, part, machine tool, tool, etc. information, determine the cutting parameters, including cutting depth, width, spindle speed, feed rate, feed mode, etc., to provide detailed parameter information for numerical control programming.

[0067] 4.3) Conduct secondary development on the detailed process design process model of features according to the specific application system. Through the definition of feature decision - making elements in the process design process, realize the call of the detailed process design based on features, and directly generate the process content corresponding to the features.

[0068] Step Five: Establish the corresponding refined typical process according to the detailed process model and combined with the manufacturing features of the shell part, and form an example knowledge base;

[0069] According to the classification of the housing categories, summarize the basic technological contents of the rough machining, semi-finishing machining, and finishing machining processes for each type of housing part. Further subdivide according to the structure, features, materials, dimensions, precision, heat treatment, technical requirements, etc. of each type of part to form more precisely similar part categories, and establish corresponding more accurate and detailed typical processes, determine their selection conditions and constraint rules, and form a rich case knowledge base according to the case knowledge model structure.

[0070] Step 6: Rapid process design for housing parts based on features and knowledge

[0071] Based on the part design model, extract the design features of the part model; according to the mapping relationship between the design features and the manufacturing features, form the manufacturing feature family of the housing part to be designed; combine with the part feature processing technology knowledge base, match the manufacturing features and the process, complete the selection of the processing method and the transfer of parameters, and form the part manufacturing process set; according to the part category and the typical process case knowledge base, combine the manufacturing process set to form the part manufacturing process.

[0072] This application analyzes the structures and process characteristics of typical parts through the numerical control processing technology of housing parts, establishes a manufacturing feature system and processing knowledge oriented to manufacturing features (including process methods, tools, processing parameters, etc.), establishes the mapping and correlation relationship between the typical process and the features, and establishes a feature processing process decision knowledge base. According to the overall information, technical requirements, key feature information, etc. of the part, match the typical process plan and the typical process specification, and revise the information such as the process plan and the process specification to complete the refined process design based on features, the optimization of process parameters, and the process design based on model recognition and analysis, realize the reuse of the typical process, so as to achieve the purpose of rapid and efficient process design, make the housing parts more convenient and smooth in the process manufacturing design, effectively improve the process standardization level, improve the process design efficiency, and at the same time fully accumulate and inherit the experience of experts in the professional technical field, so that the process design of housing parts no longer completely depends on personal experience.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent replacements, and any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

[0074] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A rapid process design method for shell parts, characterized in that It includes the following steps: (1) Classify the shell parts; (2) Inductively classify the design features and manufacturing features of the shell parts; (3) Establish the manufacturing feature system and its attributes of the shell parts, determine the mapping relationship with the design features and geometric features, determine the manufacturing feature information, and complete the feature modeling of the shell parts; (4) Design a detailed process model according to the feature modeling of the shell parts; (5) Establish corresponding fine typical processes based on the detailed process model and in combination with the manufacturing features of the shell parts, and form an example knowledge base; (6) Based on the feature modeling of the shell parts, extract the design features of the part model, and form a manufacturing feature family of the shell parts to be designed according to the mapping relationship between the design features and the manufacturing features; Combine the fine typical processes of the shell parts to be designed, match the manufacturing features and the process, complete the selection of the processing method and the transfer of parameters, and form a set of part manufacturing processes; furthermore, combine the set of part manufacturing processes according to the category and fine typical processes of the shell parts to be designed to form the manufacturing process of the shell parts to be designed.

2. The rapid process design method for shell parts according to claim 1, characterized in that The specific content of the step (1) is: classify the geometric structure of the shell parts according to the main structure, process characteristics and main equipment used, find the rules from the aspects of function, composition of process characteristics and similarity of equipment used, and summarize and classify the categories of the shell parts.

3. The rapid process design method for shell parts according to claim 2, characterized in that The categories of the shell parts are divided into: box-type shells, disk-type rotary shells, tank-type rotary shells, lid-type shells, and special-type shells.

4. The rapid process design method for shell parts according to claim 1, characterized in that The design features of the shell parts in the step (2) are inductively classified as: connection form, functional interface, sealing form, segmented hole system of functional components, and oil circuit.

5. The rapid process design method for shell parts according to claim 1, characterized in that The manufacturing features of the shell parts in the step (2) are inductively classified as: milling, point machining, turning, and special machining.

6. The rapid process design method for shell parts according to any one of claims 1 to 5, characterized in that The specific content of the step (2) is: (2.1) Combine and inductively obtain specific design features according to the geometric structure of the shell parts and the specific geometric elements of the processing features; (2.2) Combine the design features of the shell parts, analyze and inductively summarize the shell structure and process, find the rules from the geometric similarity and process method similarity of the shell parts, and summarize the manufacturing features of the shell parts; (2.3) Classify the manufacturing features of the shell parts according to the functional characteristics and manufacturing characteristics, and code the classified manufacturing features.

7. The rapid process design method for shell parts according to claim 6, characterized in that The specific content of the step (3) is: (3.1) Select typical shells according to the product series, pay attention to the key factors, overall plan the remaining auxiliary factors to sort out the typical features, establish the manufacturing feature system and its attributes covering the shell parts, and determine the mapping relationship with the design features and geometric features; (3.2) Determine the manufacturing feature information of the shell parts, and the manufacturing feature information includes shape size and accuracy, position size and accuracy, roughness, heat treatment requirements, and surface hardness; (3.3) Establish a feature model of the shell parts, determine the extraction technology and tools for the manufacturing feature information, and extract the manufacturing feature information, overall part information, and PMI information of the shell parts; (3.4) Sort out the feature processing knowledge logic according to the manufacturing feature modeling, and formulate the feature processing process decision knowledge structure.

8. The rapid process design method for shell parts according to claim 7, characterized in that The specific content of step (4) is as follows: (4.1) Establish a knowledge base for the process decision of shell part feature machining, including the decision of feature machining process methods, the design of feature machining tool parameters, the matching of feature machining - process information, the selection of feature machining tools, and the selection of feature machining process parameters; (4.2) Based on the shell part information, process information, and manufacturing feature information, utilize the feature machining process decision knowledge in the knowledge base for the process decision of shell part feature machining to establish a feature - based detailed process design process model; (4.3) Conduct secondary development on the feature - based detailed process design process model according to the specific application system, and realize the call of feature - based detailed process design by defining the feature decision elements in the process design process.

9. The rapid process design method for shell parts according to claim 8, characterized in that The decision of feature machining process methods includes the decision of machining method chains, local surface treatment, and machining allowance, and generates feature machining units; The design of feature machining tool parameters includes tool types, materials, dimensions, and cutting edge parameters; the matching of feature machining - process information establishes the association relationship between processes and feature machining according to process information, and generates machining steps according to tool information; the selection of feature machining tools is based on tool parameters, and conducts intelligent matching queries with the tool database, and determines the selected tools through human - machine interaction; the selection of feature machining process parameters is based on the relevant information of feature machining information, parts, machine tools, and tools to determine cutting parameters, and the cutting parameters include cutting depth, width, spindle speed, feed rate, and feed mode, providing detailed parameter information for numerical control programming.

10. The rapid process design method for housing parts according to claim 8, characterized in that, The specific content of step (5) is as follows: (5.1) According to the classification of shell part categories, summarize the basic process content of the rough machining, semi - finishing machining, and finishing machining stages of each type of shell part; (5.2) Further subdivide according to the structure, features, materials, dimensions, precision, heat treatment, and technical requirements of each type of part to form more precisely similar part categories, establish more accurate and detailed typical processes corresponding to them, and determine their selection conditions and constraint rules; (5.3) Form a case knowledge base according to the case knowledge model structure.

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