Part multi-state engineering drawing expression method based on Creo

Abstract

The invention relates to a component multi-state engineering drawing expression method based on Creo. The method comprises the following steps: in a model feature tree, establishing a plurality of state features corresponding to a plurality of different states representing a target part, and obtaining a three-dimensional model of the target part; wherein the plurality of state features are independently defined in the model feature tree; establishing different state views based on the three-dimensional model; based on the target state, only displaying state features corresponding to the target state, and excluding other state features; and in an engineering drawing generation process, adding the state views corresponding to the different target states into the same engineering drawing so as to generate a projection view set containing a plurality of different states of the target part in the same engineering drawing. According to the method, multi-state expression of the parts can be performed in one engineering drawing by using one model, so that the modeling efficiency is remarkably improved, and the model structure is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of computer-aided design (CAD), and in particular to a Creo-based method for expressing multi-state engineering drawings of parts. Background Art

[0002] With the development of computer-aided design (CAD) software, engineering drawings, as a two-dimensional representation of three-dimensional models, have become a vital link between product design and manufacturing. Especially in the design of components with multiple operating states, engineering drawings not only need to express static geometry but also often convey deformation, constraints, or assembly results under different operating conditions.

[0003] Taking O-rings, sealing rings, retaining rings and other components with compression and elastic deformation characteristics as an example, such components have obvious geometric differences between the "free state" and the "working state". The engineering drawings need to accurately express their dimensions, morphology and matching relationships in different states to meet the application requirements of multiple links such as structural design, process review, and supply chain delivery.

[0004] In the existing engineering drawing generation process, the common approach for representing multiple states of a component is to create a separate 3D model file for each state, then add all models of each state to the drawing using the "Add Model" function. Finally, using the "Switch Model" method, multiple views of the component state can be achieved. However, this approach not only increases the file size of the drawing, but also, due to the large number of associated models, can easily lead to unrelated models being mistakenly detected or unable to be modified during check-in and check-out of the PLM (Product Lifecycle Management) system. This creates operational inconvenience and makes PLM system management difficult, significantly reducing design efficiency. Summary of the Invention

[0005] To this end, the present invention provides a method for expressing multi-state parts in an engineering drawing based on Creo, which can express multi-state parts in an engineering drawing using one model.

[0006] To solve the above technical problems, the present invention provides a method for expressing multi-state engineering drawings of parts based on Creo, comprising: In the model feature tree, a plurality of state features corresponding to a plurality of different states of the target component are established to obtain a three-dimensional model of the target component; wherein the plurality of state features are defined independently of each other in the model feature tree; Based on the three-dimensional model, different state views are established; based on the target state, only state features corresponding to the target state are displayed, and other state features are excluded; During the engineering drawing generation process, state views corresponding to different target states are added to the same engineering drawing to generate a set of projection views containing multiple different states of the target component in the same engineering drawing.

[0007] In one embodiment of the present invention, the multiple different states include a free state and a working state of the target component.

[0008] In one embodiment of the present invention, the target state includes a free state and a working state of the target component.

[0009] In one embodiment of the present invention, the target component includes an O-ring, a sealing ring or a retaining ring.

[0010] In one embodiment of the present invention, different state views are established based on the three-dimensional model, including: By creating different state views in the Simplified Representation tab in the View Manager in Creo software.

[0011] In one embodiment of the present invention, based on the target state, only the state features corresponding to the target state are displayed, and the remaining state features are excluded, including: Exclude the remaining state features by setting the "Exclude" method in the "Simplified Representation" tab in the "View Manager" of the Creo software.

[0012] In one embodiment of the present invention, the state feature includes a combination of at least one or more groups of geometric modeling steps for constructing solids, chamfers, surfaces or cross-section operations.

[0013] In one embodiment of the present invention, adding state views corresponding to different target states to the same engineering drawing to generate a set of projection views containing multiple different states of the target component in the same engineering drawing includes: After creating a new "Engineering Drawing", switch the required target state by calling the "Display State" option in the "Draw Model" function, and then generate a set of projection views containing multiple different states of the target components in one engineering drawing.

[0014] The above technical solution of the present invention has the following advantages over the prior art: The present invention describes a method for expressing multi-state engineering drawings of components based on Creo. By constructing multiple state features in the same three-dimensional model, unified modeling of different working states of components is achieved, eliminating the need to create multiple model files separately. This significantly improves modeling efficiency and simplifies the model structure.

[0015] The present invention centrally manages all model status data within a single model, avoiding check-in and check-out conflicts caused by data dispersion in traditional multi-model design. This significantly reduces the operational error rate in the product lifecycle management (PLM) system and improves the integration compatibility between Creo and PLM systems. The present invention can realize the visual expression of multiple states of parts in one engineering drawing, reduce the number of references between drawings and models, reduce the memory burden of engineering drawings, and improve drawing efficiency and drawing maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0017] Figure 1 This is an operational flow chart of the Creo-based component multi-state engineering drawing expression method in the present invention.

[0018] Figure 2 Schematic diagram of the model tree in the present invention.

[0019] Figure 3 Create a schematic diagram for the state view in the present invention.

[0020] Figure 4 This is a schematic diagram of generating multiple projection view sets in different states in the same engineering drawing in the present invention.

[0021] Figure 5 This is a schematic diagram of the turbine end sealing ring in a free state in an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the turbine end sealing ring in a compressed state in an embodiment of the present invention.

[0023] Figure 7 Schematic diagram of establishing multi-state features in an embodiment of the present invention.

[0024] Figure 8 This is a schematic diagram of constructing a state view in an implementation case of the present invention.

[0025] Figure 9 This is a schematic diagram of drawing an engineering drawing in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0027] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0028] Reference Figure 1 As shown in the figure, a method for expressing multi-state engineering drawings of components based on Creo includes: S1. In a model feature tree, establish multiple state features corresponding to multiple different states of a target component to obtain a three-dimensional model of the target component; wherein the multiple state features are defined independently of each other in the model feature tree.

[0029] The multiple state features are independently defined in the model feature tree, without dependencies, facilitating subsequent selective display and exclusion. The state features comprise a combination of at least one or more geometric modeling steps for constructing solids, chamfers, surfaces, or cross-sections, used to accurately restore the morphology of the target component in that state.

[0030] The multiple different states include the target component's free state and working state (e.g., compressed state, mating state). The target state includes the target component's free state and working state (e.g., compressed state, mating state). This is applicable to deformable components such as O-rings, sealing rings, and retaining rings.

[0031] Reference Figure 2 As shown in the figure, by constructing n state features under the model tree of a Creo model, unified modeling of all states is achieved.

[0032] S2. Based on the three-dimensional model, establish different state views; based on the target state, only display the state features corresponding to the target state and exclude the remaining state features; refer to Figure 3 shown.

[0033] Specifically, different status views are created in the "Simplified Representation" tab in the "View Manager" of Creo software.

[0034] Exclude the remaining state features by setting the "Exclude" method in the "Simplified Representation" tab in the "View Manager" of the Creo software.

[0035] It should be noted that each state view corresponds to a target state, and only the state features corresponding to it are retained, and the remaining state features are hidden by setting the "exclude" state; Each state view exists independently in the simplified representation and can be called, named and activated separately, which provides high flexibility. The "exclusion" method is based on the simplified view editing function provided by Creo software, and the setting is completed by right-clicking to specify the status feature.

[0036] Reference Figure 3 As shown, each state view is defined by including the features of the corresponding state and excluding the features of other states, ensuring that the required state is accurately expressed in different views.

[0037] S3, in the process of generating the engineering drawing, adding the state views corresponding to the different target states to the same engineering drawing, so as to generate a set of projection views containing multiple different states of the target component in the same engineering drawing, referring to Figure 4 shown.

[0038] Specifically, after creating a new "engineering drawing", by calling the "display state" option in the "draw model" function, the required target state is switched, and then a set of projection views containing multiple different states of the target components is generated in an engineering drawing.

[0039] It should be noted that after completing the status view definition, the engineering drawing stage begins: Create a new engineering drawing file; During the model drawing process, switch the required simplified representation through the "Display State" option and select the target state view; In the same viewing direction, insert multiple different state views to form multiple state projection views; Complete projection and dimensioning to express target components in different states in the same engineering drawing.

[0040] Reference Figure 4 As shown in the figure, multiple state views (state 1 view, state 2 view...state n view) are added to an engineering drawing through the same Creo model, forming a set of engineering drawings with multi-state expressions.

[0041] Example 1 by Figure 5 、 Figure 6 The turbine end sealing ring shown is a specific example to illustrate the application process of the method of the present invention. The turbine end sealing ring has two different working states: free state and compressed state: In the free state, the sealing ring is naturally open, and its key dimension is the opening dimension E, such as Figure 5 As shown; In the compressed state, the sealing ring is pressed into the sealing groove and produces elastic deformation. At this time, it has a nominal diameter φA and a closed size D, such as Figure 6 shown.

[0042] In order to accurately express the geometric difference between the above two states in engineering drawings, the method of the present invention is adopted, and the operating steps are as follows: Step 1: Create multi-state features Reference Figure 7 As shown in the figure, in the Creo modeling environment, the same 3D model file (vortex end seal ring.PRT) is created separately: The "free state" geometric feature and its associated fillets representing the free state; The "Packed State" geometric feature and its associated rounds that represent the packed state.

[0043] These two groups of features exist as independent modeling features in the model tree and are independent of each other, making it easy to exclude or retain them separately later.

[0044] Step 2: Build the status view Reference Figure 8 As shown, in the "Simplified Representation" tab of the "View Manager", create "Free State" and "Compressed State" respectively; among them, "Free State" excludes the compressed state features; "Compressed State" excludes the free state features. The details are as follows: Open Creo's View Manager, switch to the Simplified Representation tab, and perform the following operations: Create a new "Free State" view: In the menu manager, select "Features" → "Add / Delete Features" → set the "Compressed State" and its subordinate state features to "Exclude"; retain the geometric features of the free state.

[0045] Create a new "Compression State" view: Similarly, the “free state” and its subsidiary state characteristics are excluded, and only the compressed state characteristics are retained.

[0046] Finally, two sets of state views, "free state" and "compression state", are established to ensure that only structural features corresponding to the state are displayed in different views.

[0047] Step 3: Draw the engineering drawing Reference Figure 9 As shown, create a new "Engineering Drawing"; select the required model activity state, and you can express two states in the same view direction.

[0048] Enter the Engineering Drawing module and complete the following operations: Create a new engineering drawing and load the turbine end sealing ring model; In the "Drawing Model" properties, switch the "Display State" to "Compressed State" and "Free State" in turn; Insert two views with the same projection perspective (such as FRONT view) to express the geometric appearance of the component in the compressed state and free state respectively.

[0049] In this way, the shape and key dimensions of the sealing ring under different working conditions can be expressed in an engineering drawing, and the nominal diameter φA, closed size D and open size E can be marked respectively.

[0050] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0051] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0052] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0053] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0054] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for expressing multi-state engineering drawings of parts based on Creo, characterized by: include: In the model feature tree, a plurality of state features corresponding to a plurality of different states of the target component are established to obtain a three-dimensional model of the target component; wherein the plurality of state features are defined independently of each other in the model feature tree; Based on the three-dimensional model, different state views are established; based on the target state, only state features corresponding to the target state are displayed, and other state features are excluded; During the engineering drawing generation process, state views corresponding to different target states are added to the same engineering drawing to generate a set of projection views containing multiple different states of the target component in the same engineering drawing.

2. The method for expressing multi-state engineering drawings of parts based on Creo according to claim 1, characterized in that: The multiple different states include a free state and a working state of the target component.

3. The method for expressing multi-state engineering drawings of parts based on Creo according to claim 1, characterized in that: The target state includes the free state and the working state of the target component.

4. The method for expressing multi-state engineering drawings of parts based on Creo according to claim 1, characterized in that: The target parts include O-rings, sealing rings or retaining rings.

5. The method for expressing multi-state engineering drawings of parts based on Creo according to claim 1, characterized in that: Based on the 3D model, different status views are established, including: By creating different status views in the Simplified Representation tab in the View Manager of Creo software.

6. The method for expressing multi-state engineering drawings of parts based on Creo according to claim 1, characterized in that: Based on the target state, only the state features corresponding to the target state are displayed, excluding the rest of the state features, including: Exclude the remaining state features by setting "Exclude" in the "Simplified Representation" tab in the "View Manager" of the Creo software.

7. The method for expressing multi-state engineering drawings of parts based on Creo according to claim 1, characterized in that: The state feature includes a combination of at least one or more groups of geometric modeling steps for constructing solids, chamfers, surfaces or cross-section operations.

8. The method for expressing multi-state engineering drawings of parts based on Creo according to claim 1, characterized in that: Adding state views corresponding to different target states to the same engineering drawing to generate a set of projection views containing multiple different states of the target component in the same engineering drawing, including: After creating a new "Engineering Drawing", you can switch the required target state by calling the "Display State" option in the "Draw Model" function, and then generate a set of projection views containing multiple different states of the target component in a single engineering drawing.

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