CN111679630A - Quick programming method for numerical control machining of engine case - Google Patents
Quick programming method for numerical control machining of engine case Download PDFInfo
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- CN111679630A CN111679630A CN202010615053.XA CN202010615053A CN111679630A CN 111679630 A CN111679630 A CN 111679630A CN 202010615053 A CN202010615053 A CN 202010615053A CN 111679630 A CN111679630 A CN 111679630A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/4093—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine
- G05B19/40937—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine concerning programming of machining or material parameters, pocket machining
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32161—Object oriented control, programming
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Abstract
The invention discloses a quick programming method for numerical control machining of an engine case, which comprises the steps of establishing a theoretical machining feature library of the engine case and endowing each theoretical machining feature with a corresponding machining process; decomposing the model of the engine case to be processed to obtain the actual processing characteristic of the engine case to be processed, comparing the actual processing characteristic with the theoretical processing characteristic, identifying the theoretical processing characteristic which is the same as the actual processing characteristic, and endowing the actual processing characteristic with the processing technology of the theoretical processing characteristic which is the same as the actual processing characteristic; matching machine tool information, cutter information and cutting parameter information for numerical control milling of the engine case with a machining process of actual machining characteristics to obtain machining parameter information of the engine case to be machined; and generating a machining tool path according to the machining parameter information of the engine case to be machined, and exporting the machining tool path to finish the numerical control machining programming of the engine case. The invention can effectively improve the programming quality and the programming efficiency of the thin-wall annular part.
Description
Technical Field
The invention belongs to the technical field of numerical control machining of thin-wall annular parts, and particularly relates to a quick programming method for numerical control machining of an engine case.
Background
The aero-engine case type structural part belongs to a thin-wall annular part, is rich in curved surface and intersection characteristics, has the characteristics of complex structure and poor rigidity, is large in processing difficulty, and provides challenges for numerical control programming, particularly, a large number of complex auxiliary elements need to be created in the programming process, a large number of processing tool rails need to be created manually, the programming workload is large, the efficiency is low, the requirements for people are high, the experience dependence is strong, the programming quality is unstable, and the knowledge accumulation is poor, so that the improvement of the numerical control programming efficiency and quality of aero-engine parts is always a difficult point for the research of aero-engine manufacturing technology.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a quick programming method for numerical control machining of an engine case, which effectively improves the programming quality and the programming efficiency of a thin-wall annular part.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a quick programming method for numerical control machining of an engine case comprises the following steps:
step 1: establishing a theoretical machining feature library of the engine case, wherein the theoretical machining feature library comprises a groove feature, a rib feature, a hole feature and a boss feature; endowing each theoretical processing characteristic with a corresponding processing technology;
step 2: decomposing the model of the engine case to be processed to obtain the actual processing characteristic of the engine case to be processed, comparing the actual processing characteristic with the theoretical processing characteristic, identifying the theoretical processing characteristic which is the same as the actual processing characteristic, and endowing the actual processing characteristic with the processing technology of the theoretical processing characteristic which is the same as the actual processing characteristic;
and step 3: matching machine tool information, cutter information and cutting parameter information for numerical control milling of the engine case with a machining process of actual machining characteristics to obtain machining parameter information of the engine case to be machined;
and 4, step 4: and generating a machining tool path according to the machining parameter information of the engine case to be machined, and exporting the machining tool path to finish the numerical control machining programming of the engine case.
Further, in the step 1, according to the numerical control programming specification of the parts of the aero-engine case, the structure of the engine case is analyzed, the geometric features with the mature processing technology are extracted, and the extracted geometric features are defined as a theoretical processing feature library of the engine case.
Further, the slot features include annular slots, undercut slots, and arcuate slots.
Further, the rib features are divided into long ribs and short ribs according to the difference of length and rotation angle.
Further, the boss features include a circular boss, a quincunx boss, a triangular boss, and a rectangular boss.
Further, in the step 2, the engine case model to be processed is decomposed by using the face-edge relationship, and according to the defined theoretical processing characteristics of the engine case, the topological relationship between the geometric elements of the characteristics is expressed by using a method based on the holographic attribute face-edge map, so that all the actual processing characteristics on the engine case to be processed are obtained.
Further, all the obtained actual machining characteristics on the engine case to be machined are saved in the form of an XML file.
Further, in the step 3, referring to the numerical control milling programming specification of the engine case, adding machine tool information, tool information and cutting parameter information for the numerical control milling of the engine case into the case characteristic numerical control programming system.
Further, in the step 4, the generated machining tool path is derived by using an NC code.
Further, the actual machining characteristics of the engine case to be machined are displayed through a human-computer interaction interface.
Compared with the prior art, the invention has at least the following beneficial effects: the invention provides a quick programming method for numerical control machining of an engine case, which comprises the steps of establishing a theoretical machining feature library of the engine case, wherein the theoretical machining feature library comprises a groove feature, a rib feature, a hole feature and a boss feature; endowing each theoretical processing characteristic with a corresponding processing technology; decomposing the model of the engine case to be processed to obtain the actual processing characteristic of the engine case to be processed, comparing the actual processing characteristic with the theoretical processing characteristic, identifying the theoretical processing characteristic which is the same as the actual processing characteristic, and endowing the actual processing characteristic with the processing technology of the theoretical processing characteristic which is the same as the actual processing characteristic; matching machine tool information, cutter information and cutting parameter information for numerical control milling of the engine case with a machining process of actual machining characteristics to obtain machining parameter information of the engine case to be machined; and generating a machining tool path according to the machining parameter information of the engine case to be machined, and exporting the machining tool path to finish the numerical control machining programming of the engine case. Therefore, the invention provides a geometric and process coupling-based casing feature identification method and a characteristic-based casing part cutter track automatic generation method through rapid numerical control programming of an aero-engine casing, calculates the cutter track through the reconstructed feature drive geometry, standardizes and optimizes the programming cutter track, effectively solves the problems of low cutter track programming efficiency and unstable programming quality, and provides effective guarantee for production and manufacturing of parts such as the aero-engine casing.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a fast programming method for numerical control machining of an engine case according to the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As a specific embodiment of the present invention, as shown in fig. 1, a fast programming method for numerical control machining of an engine case is used for fast programming of an aircraft engine case, a machining feature definition method for engine case type parts is provided, automatic identification of machining features of the engine case type parts is realized according to feature definition contents, process decision and automatic programming of machining tool paths are automatically performed by a machining feature technology, thereby effectively improving the part programming quality and programming efficiency, and enabling machining experiences accumulated by an enterprise for a long time to be inherited and shared, and specifically comprising the following steps:
step 1: analyzing an engine case structure according to numerical control programming specifications of parts of an aero-engine case, extracting typical geometric features with a mature processing technology, and defining the extracted geometric features as a theoretical processing feature library of the engine case, wherein the theoretical processing feature library comprises groove features, rib features, hole features and boss features at present; endowing each theoretical processing characteristic with a corresponding processing technology;
the groove features mainly refer to areas with raised periphery and depressed middle on the outer surface of the casing, and mainly comprise an annular groove, a depressed groove and an arc-shaped groove; the rib characteristics mainly refer to narrow and long convex connection parts among convex characteristics on the outer surface of the casing, and are divided into long ribs and short ribs according to different lengths and rotation angles; the boss is characterized in that the middle of the outer surface of the casing is raised, the whole structure is higher than the peripheral raised structure, and the boss can be subdivided into round, quincunx, triangular, rectangular and the like according to different boss geometric shapes;
step 2:
the method comprises the following steps that the characteristics of an engine case are automatically identified, the automatic characteristic identification function is to analyze an engine case model to be processed for a selected face-edge relation of the engine case to be identified according to the structural characteristics of the engine case part, the topological relation among characteristic geometric elements is expressed by using a method based on a holographic attribute face-edge diagram according to the defined theoretical processing characteristics of the engine case, so that all actual processing characteristics on the engine case to be processed are obtained, and then the processing characteristics on each layer of the engine case to be processed are automatically obtained according to an identified parting surface; comparing the actual processing characteristic with the theoretical processing characteristic, identifying the theoretical processing characteristic which is the same as the actual processing characteristic, and endowing the actual processing characteristic with the processing technology of the theoretical processing characteristic which is the same as the actual processing characteristic;
the automatic feature recognition process can be regarded as a process of map matching, and the automatic feature recognition firstly selects a part body to obtain information of a design model, and then selects a parting surface on the part body to construct a virtual modeling coordinate system. And searching seed surfaces of all the characteristics through graph relation matching and topology retrieval, searching entity characteristic elements meeting the surface-edge relation of the characteristics such as grooves, ribs, holes, bosses and the like through the seed surfaces, and finally obtaining a characteristic identification result list. The feature recognition result list may be presented in the form of a dialog box, and a user may highlight a corresponding single feature or class of features by clicking on the corresponding feature in the feature list. And outputting a feature identification list, storing the feature of the feature identification in an XML file form, recording the face-edge relation of the identified part, and inputting feature information when performing automatic process decision and machining tool path generation later, so as to automatically construct a cutting machining area and a driving geometric element of the feature to be machined, and finally automatically complete the automatic generation of the tool path of the corresponding feature.
And step 3: adding machine tool information, cutter information and cutting parameter information for numerical control milling of the engine case into a case characteristic numerical control programming system according to an engine case numerical control milling programming specification, and matching with a machining process of actual machining characteristics to obtain machining parameter information of the engine case to be machined;
that is, the system will automatically match the machine tool information, the cutting parameters and the machining characteristics according to the recorded typical geometric structure and the information of the process knowledge base and the machining parameter base, and automatically decide the machining parameter information according to the characteristics by importing the characteristic recognition result of the casing into the process decision module.
And 4, step 4: generating a machining tool path according to the machining parameter information of the engine case to be machined, and exporting the machining tool path by adopting an NC code to finish the numerical control machining programming of the engine case; the tool path is automatically generated, the information of each characteristic surface is automatically extracted according to the characteristic identification result, the constraint condition of the tool path is formed through the driving information of each surface, the tool path meeting the requirement is automatically calculated by utilizing an algorithm according to the special requirement of the numerical control machining of the case on the tool path, and the machining operation is added according to the result of the automatic process decision.
The invention relates to a cartridge receiver part, which is characterized in that a programming process model is read before numerical control programming, then an inner annular surface area and an outer annular surface area are separated, further, the characteristic definition is automatically completed according to the characteristic definition of a characteristic definition library, then, a cutting area is automatically constructed according to a process knowledge library, a cutting parameter library and a cutter parameter library, the automatic process decision and the generation of a processing tool path are completed, finally, numerical control processing NC code output is completed through a post-processing module, and finally, the automatic numerical control programming of the engine cartridge receiver part is completed. The quick programming of the characteristics of the aero-engine case is realized by defining the processing characteristics of the case, automatically identifying the characteristics, automatically making a process decision, automatically generating a tool path and carrying out processing verification, and the processing programming level and the processing programming capability of the case are remarkably improved.
The invention takes the structural characteristics as a processing technology information carrier, automatically identifies the processing characteristics of a typical structure, autonomously generates a technology decision and a tool path, realizes automatic tool path programming and generation program, finally realizes automatic and rapid programming of the program, has the technical advantage of integration, and achieves the standardization and standardization of the milling program programming of the engine case. In addition, in the quick programming method of the casing characteristics, the automatic processing track generation module, the automatic processing program generation module and the automatic milling program structure generation module are independently designed during functional module design, the functions can be flexibly used as required, the functional modules are independently and inheriting in the coexistence manner, new modules can be developed and integrated into a system according to new use requirements, and the quick programming method has good expansibility.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A quick programming method for numerical control machining of an engine case is characterized by comprising the following steps:
step 1: establishing a theoretical machining feature library of the engine case, wherein the theoretical machining feature library comprises a groove feature, a rib feature, a hole feature and a boss feature; endowing each theoretical processing characteristic with a corresponding processing technology;
step 2: decomposing the model of the engine case to be processed to obtain the actual processing characteristic of the engine case to be processed, comparing the actual processing characteristic with the theoretical processing characteristic, identifying the theoretical processing characteristic which is the same as the actual processing characteristic, and endowing the actual processing characteristic with the processing technology of the theoretical processing characteristic which is the same as the actual processing characteristic;
and step 3: matching machine tool information, cutter information and cutting parameter information for numerical control milling of the engine case with a machining process of actual machining characteristics to obtain machining parameter information of the engine case to be machined;
and 4, step 4: and generating a machining tool path according to the machining parameter information of the engine case to be machined, and exporting the machining tool path to finish the numerical control machining programming of the engine case.
2. The rapid programming method for numerical control machining of the engine case according to claim 1, wherein in the step 1, the structure of the engine case is analyzed according to the numerical control programming specification of parts of the aero engine case, the geometric features with the mature machining process are extracted, and the extracted geometric features are defined as a theoretical machining feature library of the engine case.
3. The fast programming method for numerical control machining of an engine case of claim 1, wherein the slot features comprise an annular slot, a undercut slot, and an arcuate slot.
4. The rapid programming method for numerical control machining of an engine case according to claim 1, wherein the rib features are divided into long ribs and short ribs according to different lengths and rotation angles.
5. The rapid programming method for numerical control machining of an engine case according to claim 1, wherein the boss features include a circular boss, a quincunx boss, a triangular boss, a rectangular boss.
6. The fast programming method for numerical control machining of the engine case as claimed in claim 1, wherein in the step 2, the model of the engine case to be machined is decomposed by using a face-edge system, and the topological relation between the geometric elements of the feature is expressed by using a method based on a holographic attribute face-edge map according to the defined theoretical machining feature of the engine case, so as to obtain all the actual machining features on the engine case to be machined.
7. The rapid programming method for the numerical control machining of the engine case as claimed in claim 6, characterized in that all the obtained actual machining characteristics of the engine case to be machined are saved in the form of XML files.
8. The rapid programming method for numerical control machining of the engine case according to claim 1, wherein in the step 3, machine tool information, tool information and cutting parameter information for numerical control milling of the engine case are added to a case characteristic numerical control programming system with reference to an engine case numerical control milling programming specification.
9. The rapid programming method for numerical control machining of the engine case as set forth in claim 1, wherein the machining tool path generated in the step 4 is derived by using an NC code.
10. The rapid programming method for numerical control machining of the engine case as set forth in claim 1, wherein actual machining characteristics of the engine case to be machined are displayed through a human-computer interface.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112305993A (en) * | 2020-11-16 | 2021-02-02 | 广州傲创智能科技有限公司 | Method for automatically generating programming process |
| CN112327755A (en) * | 2020-11-16 | 2021-02-05 | 广州傲创智能科技有限公司 | Automatic frame identification method for die carrier |
| CN116165968A (en) * | 2023-04-24 | 2023-05-26 | 成都航利航空科技有限责任公司 | Numerical control procedure processing parameter recording method |
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