CN-121989150-A - Polishing and grinding method, polishing and grinding system, manufacturing method and medium for curved thin-wall part

CN121989150ACN 121989150 ACN121989150 ACN 121989150ACN-121989150-A

Abstract

The invention provides a polishing and grinding method, a polishing and grinding system, a manufacturing method and a computer readable medium for a curved thin-wall part. The processing method comprises the steps of S1, obtaining a polishing motion track map of a grinding head according to a polishing allowance map of the curved thin-wall part, S2, setting an auxiliary support on the non-processing side of the curved thin-wall part, and S3, in the polishing process of the curved thin-wall part by the grinding head, controlling a threshold value according to a pressing force, and regulating and controlling the pressing force between the grinding head and the part to be lower than the pressing force control threshold value in real time.

Inventors

LI LEI
YANG YIWEN
XU JIANGLI
XU KAILIANG
GAO NING
YAO QUANLING
REN JIE

Assignees

中国航发商用航空发动机有限责任公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. The polishing and grinding method of the curved thin-wall part is characterized by comprising the following steps of: according to the polishing allowance map of the curved thin-wall part, a polishing movement track map of the grinding head is obtained; An auxiliary support is arranged on the non-processing side of the curved thin-wall part; in the polishing and grinding process of the grinding head on the curved thin-wall part, the pressing force between the grinding head and the part is regulated and controlled in real time according to the pressing force control threshold value below the pressing force control threshold value.
2. The polishing method according to claim 1, wherein in the step S1, the number of polishing layers is configured according to a polishing allowance map of the curved thin-walled part, an initial polishing track is configured according to a profile contour, and an optimized polishing track with uniform pressing force is obtained according to different polishing allowances at different positions in the initial polishing track.
3. The polishing method according to claim 1, wherein in S1, a polishing allowance map of the curved thin-walled part is obtained according to a size distribution of the curved thin-walled part after near-forming.
4. The polishing method according to claim 1, wherein in S3, an initial polishing head pressing force is set, and a pressing force of the polishing head against the curved thin-walled part during polishing is sensed in real time so that the pressing force can be adjusted in S3.
5. The polishing method according to claim 1, wherein the step S2 comprises providing an auxiliary support on the inner wall of the curved thin-walled part when polishing the outer wall of the curved thin-walled part, and providing an auxiliary support on the outer wall of the curved thin-walled part when polishing the inner wall of the curved thin-walled part.
6. The polishing method according to claim 1, wherein the polishing head is provided with a plurality of thickness measuring sensors and moves synchronously with the polishing head, the front thickness measuring sensor is used for monitoring the wall thickness before polishing, and the rear thickness measuring sensor is used for monitoring the wall thickness after polishing.
7. A method for manufacturing a curved thin-walled part, comprising the polishing method according to claims 1-6, wherein the manufacturing method comprises obtaining a near-formed part of the curved thin-walled part before performing the polishing method, and obtaining a polishing allowance map of the curved thin-walled part according to the near-formed part.
8. A numerical control polishing and grinding system (1000) for curved thin-walled parts, characterized by comprising: the mechanical arm (1) is connected with a grinding head for polishing and grinding the curved thin-wall part (100); The tool (2) is used for providing support on the non-processing side of the curved thin-wall part; The grinding head (3) is connected with a thickness measuring sensor (31) and a pressure sensor (32); The control unit (4), with arm (1), thickness measurement sensor (31), pressure sensor (32) electricity is connected, receive thickness measurement sensor (31), pressure sensor's (32) sensing data to and output control signal to arm (1), include: A memory (41) for storing instructions executable by the processor; a processor (42) for performing the steps of the polishing method according to claims 1-6, which can be performed by a computer.
9. The numerical control polishing system according to claim 8, wherein the polishing head (3) is provided with a plurality of thickness measuring sensors (31), the plurality of thickness measuring sensors (31) move synchronously with the movement of the polishing head (3), the front thickness measuring sensor is used for monitoring the wall thickness before polishing, and the rear thickness measuring sensor is used for monitoring the wall thickness after polishing.
10. A computer-readable medium, on which a computer program is stored, characterized in that the program is executed by a processor to perform the steps of the polishing method according to claims 1-6, which are executable by a computer.

Description

Polishing and grinding method, polishing and grinding system, manufacturing method and medium for curved thin-wall part Technical Field The invention relates to a polishing and grinding method, a polishing and grinding system, a manufacturing method and a computer readable medium for curved thin-wall 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, and the main technical difficulty is represented in simultaneously realizing the precision removal of materials difficult to process, the multi-axis linkage processing of the complex curved surface, the processing flutter inhibition of the thin-wall weak rigid structure and the like. Because the machining cutting force is large and the work hardening tendency is large, when the machining is close to the final size, residual stress is easy to cause uneven distribution on the surface layer of the part, particularly when the wall of the part is too thin, the problems of excessive deformation and the like of the part caused by stress concentration are extremely easy to occur, so that the characteristics of over-high machining threshold, over-long period, high cost and the like of the part are caused, and the delivery efficiency and the market competitiveness of an aero-engine, particularly a commercial aero-engine, are further restricted. Accordingly, there is a need in the art for a low threshold, low cost, method of manufacturing controlled deformations for thin-walled complex leaf features that addresses at least one of the above technical problems. Disclosure of Invention The invention aims to provide a polishing and grinding 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 control polishing and grinding system for a curved thin-wall part. It is an object of the present invention to provide a computer readable medium. According to one aspect of the invention, the polishing and grinding method of the curved thin-wall part comprises the following steps: S1, according to a polishing allowance map of the curved thin-wall part, a polishing motion track map of a grinding head is obtained; s2, arranging an auxiliary support on the non-processing side of the curved thin-wall part; S3, in the polishing and grinding process of the grinding head on the curved thin-wall part, according to a compression force control threshold value, the compression force between the grinding head and the part is regulated and controlled in real time to be lower than the compression force control threshold value. In one or more embodiments of the polishing method, in the step S1, a polishing layer number is configured according to a polishing allowance map of the curved thin-wall part, an initial polishing track is configured according to a profile contour, and an optimized polishing track with uniform pressing force is obtained according to different polishing allowances at different positions in the initial polishing track. In one or more embodiments of the polishing method, a polishing allowance map of the curved thin-wall part is obtained according to the size distribution of the curved thin-wall part after near forming. In one or more embodiments of the polishing method, in S3, an initial polishing head pressing force is set, and a pressing force of the polishing head on the curved thin-walled part in the polishing process is sensed in real time, so that the pressing force can be adjusted in S3. In one or more embodiments of the polishing method, the step S2 includes setting an auxiliary support on an inner wall of the curved thin-walled part when polishing an outer wall of the curved thin-walled part, and setting an auxiliary support on an outer wall of the curved thin-walled part when polishing a