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CN-122007957-A - Method, system, manufacturing method and medium for milling curved surface thin-wall part

CN122007957ACN 122007957 ACN122007957 ACN 122007957ACN-122007957-A

Abstract

The invention provides a method, a system, a manufacturing method, a computer readable medium and a computer program product for milling curved thin-wall parts. The numerical milling method comprises the steps of S1, obtaining numerical milling machining stress distribution of the curved thin-wall part, S2, dividing a local machining area matrix for the curved thin-wall part according to the machining stress distribution, S3, obtaining numerical milling tool paths according to the local machining area matrix, enabling stresses generated during machining of different areas to be offset or reduced, and S4, performing numerical milling machining on the curved thin-wall part according to the tool paths.

Inventors

  • LI LEI
  • YANG YIWEN
  • XU JIANGLI
  • XU KAILIANG
  • GAO NING

Assignees

  • 中国航发商用航空发动机有限责任公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (10)

  1. 1. A numerical milling method of a curved thin-wall part is characterized by comprising the following steps: S1, obtaining the numerical milling stress distribution of the curved thin-wall part; s2, dividing a local processing area matrix for the curved thin-wall part according to the processing stress distribution; s3, obtaining a cutter track of a plurality of mills according to the local processing area matrix, so that stress generated during processing of different areas can be mutually offset or reduced; S4, carrying out milling on the curved thin-wall part according to the cutter track.
  2. 2. The method for milling curved thin-walled parts according to claim 1, wherein in S4, during the process of milling the curved thin-walled parts, strain of the curved thin-walled parts is monitored in real time, and processing parameters and movement tracks of the tool are adjusted.
  3. 3. The method for milling curved thin-walled parts according to claim 1, further comprising the steps of, after S1 to S3, before S4: and a strain gauge is arranged at the back of the surface to be processed of the curved thin-wall part.
  4. 4. The method for milling a curved thin-walled part according to claim 3, wherein the strain of the curved thin-walled part is monitored in real time by sensing data of a strain gauge.
  5. 5. The method for milling curved thin-walled parts according to claim 1, further comprising the steps of, after S1 to S3, before S4: and constraining and positioning the curved thin-wall part to be processed.
  6. 6. A method for manufacturing a curved thin-walled part, comprising the numerical milling method according to claims 1-5, wherein the manufacturing method comprises obtaining a near-shaped part of the curved thin-walled part before performing the numerical milling method, and performing S1-S3 according to the near-shaped part to obtain numerical milling stress distribution and corresponding tool path of the near-shaped part.
  7. 7. A counter milling system (1000) for curved thin-walled parts, comprising: A movement mechanism (1) for connecting a cutter, the movement mechanism (1) providing a feed amount and a position of the cutter (2); the strain gauge (3) is arranged at the back of the surface to be processed of the curved thin-wall part (100); A control unit (4) electrically connected with the movement mechanism (1) and the strain gauge (3), capable of receiving sensing data of the strain gauge (3), and outputting a control signal to the movement mechanism (1), the control unit (4) comprising: A memory (41) for storing instructions executable by the processor; Processor (42) for performing the steps of the milling method according to claims 1-5 that can be performed by a computer.
  8. 8. The milling system (1000) of claim 7, further comprising a support fixture (5), the support fixture (5) being capable of constraining and positioning the curved thin-walled part (100) to be machined.
  9. 9. A computer readable medium having stored thereon a computer program, characterized in that the program is to be executed by a processor for carrying out the steps of the method of milling according to claims 1-5, which steps are to be executed by a computer.
  10. 10. A computer program product comprising a computer program which, when executed by a processor, implements the steps of the method of numerical milling according to claims 1-5 that are executable by a computer.

Description

Method, system, manufacturing method and medium for milling curved surface thin-wall part Technical Field The invention relates to a method, a system, a manufacturing method, a computer readable storage medium and a computer program product for milling curved thin-walled parts. Background With the continuous improvement of the performance requirements of the aero-engine, the low-rigidity parts with thin-wall complex blade shape characteristics such as the front edge reinforcing edge of the composite fan blade appear in the core parts of the aero-engine, and the profile precision and the inner and outer surface quality of the low-rigidity parts have high design requirements. Along with the development of the parts to the light weight and the special shape, the processing technology is required to break through continuously so as to meet the harsh shape requirement. The method is characterized by difficult processing properties of materials such as titanium alloy, high-temperature alloy and the like, and the characteristics of difficult processing of structures such as thin wall weak rigidity, large torsion angle, complex molded surface, large depth-to-width ratio of V-shaped grooves and the like, and the final accurate acquisition of the geometric dimension and the surface quality of the parts becomes one of the typical problems of the current manufacturing process. At present, the manufacturing of the thin-wall part with the complex curved surface mainly comprises five-axis linkage precision milling, however, the inventor discovers that the problems of uneven distribution of residual stress on the surface of the part, easy occurrence of stress concentration, excessive deformation of the part and the like are caused by uneven plastic deformation of materials caused by processing. The performance of the parts such as strength, fatigue, abrasion, corrosion and the like is reduced due to stress concentration in the service process. At present, stress relief, reduction or redistribution is generally performed by aging treatment, but for thin-walled parts, dimensional accuracy after aging treatment is difficult to ensure. Accordingly, there is a need in the art for a new method, system, method of manufacturing, computer readable storage medium, computer program product for milling curved thin-walled parts that overcomes one or a combination of the above-mentioned problems. Disclosure of Invention The invention aims to provide a numerical milling method for a curved thin-wall part. The invention aims to provide a manufacturing method of a curved thin-wall part. The invention aims to provide a numerical milling system for a curved thin-wall part. It is an object of the present invention to provide a computer readable medium. It is an object of the invention to provide a computer program product. The numerical milling method for the curved thin-wall part comprises the steps of S1, obtaining numerical milling stress distribution of the curved thin-wall part, S2, dividing a local processing area matrix for the curved thin-wall part according to the machining stress distribution, S3, obtaining numerical milling tool paths according to the local processing area matrix, enabling stresses generated during processing of different areas to be offset or reduced, and S4, performing numerical milling on the curved thin-wall part according to the tool paths. In one or more embodiments of the numerical milling method, in the step S4, during the process of performing numerical milling on the curved thin-walled part, the strain of the curved thin-walled part is monitored in real time, and the processing parameters and the movement track of the tool are adjusted. In one or more embodiments of the numerical milling method, after the steps S1 to S3 are performed, before the step S4, a strain gauge is disposed on the back of the surface to be processed of the curved thin-walled part. In one or more embodiments of the method, strain of the curved thin-walled part is monitored in real time through sensing data of strain gauges. In one or more embodiments of the numerical milling method, after performing S1 to S3, before S4, the method further comprises the step of constraining and positioning the curved thin-walled part to be machined. According to another aspect of the invention, a manufacturing method of a curved thin-walled part comprises the numerical milling method, wherein the manufacturing method further comprises the steps of obtaining a near-formed part of the curved thin-walled part before performing the numerical milling method, and performing S1 to S3 according to the near-formed part to obtain numerical milling stress distribution and corresponding tool paths of the near-formed part. According to another aspect of the invention, the numerical milling system for the curved thin-walled part comprises a moving mechanism, a strain gauge, a control unit and a control unit, wherein the moving mechanism is used for being connected