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Method for controlling machining accuracy of large integrated thin-walled parts based on finite element analysis

A thin-walled parts processing and precision control technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of overall structural parts processing deformation, local structural size out-of-tolerance, etc., to achieve control of processing accuracy, reduce The effect of reducing production cost and shortening the processing cycle

Inactive Publication Date: 2014-10-01
NANJING CHENGUANG GRP +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for controlling the machining accuracy of large integral thin-walled structural parts. The method is to pre-check the parts’ local structural dimension out-of-tolerance and Carry out a series of analyzes and predictions on the processing deformation of the overall structural parts, and then adjust the corresponding cutting process measures according to the results of the analysis and prediction, and then control the machining accuracy of the overall thin-walled structural parts

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  • Method for controlling machining accuracy of large integrated thin-walled parts based on finite element analysis
  • Method for controlling machining accuracy of large integrated thin-walled parts based on finite element analysis
  • Method for controlling machining accuracy of large integrated thin-walled parts based on finite element analysis

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with accompanying drawing, as Figure 9 It is a flow chart of controlling the machining accuracy of parts based on finite element analysis.

[0039] 1) According to the characteristic structure of the overall structural parts, such as figure 1 As shown, the total length of this structural part is 2000mm, the maximum width is 300mm, the side wall and web thickness of the cavity are both 2mm, the material is aluminum alloy 2124 commonly used in aerospace products, and the parts are typical large thin-walled structural parts. Two typical local features are extracted from the overall structural features, namely side wall features and web features, such as figure 2 shown. The size of the side wall feature is: length 300mm, height 30mm, thickness 2mm, web size information is: length 400mm, width 300mm, thickness 2mm;

[0040] 2) According to the extracted local structural features, the finite e...

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Abstract

The invention discloses a method for controlling the machining accuracy of large integrated thin-walled parts based on finite element analysis. The method comprises the following steps of: 1, extracting local structural features of the large integrated thin-walled part; 2, performing finite element simulative analysis on local structural features to obtain an optimized cutting technology; 3, numerically modeling a large integrated workblank, and loading an initial internal stress; 4, protocoling a tool path, namely protocoling the machining sequence of the feature structures; 5, performing simulative analysis on the integrated structure to obtain a predicted deformation result under the condition of process technology; 6, regulating and optimizing a clamp scheme to control machining deformation. The method adopts finite element simulation, can analyze and predict in advance before the actual machining of the parts, and thereby corresponding machining strategy is adjusted, machining deformation is effectively controlled, production cycle of the parts is shortened, and production cost is reduced.

Description

Technical field: [0001] The invention belongs to the field of mechanical processing, in particular to a method for controlling the processing accuracy of large integral thin-walled parts based on finite element analysis. Background technique: [0002] At present, modern aerospace products use a large number of overall structures with low structure-to-weight ratios while selecting high-specific-strength materials. The overall structure has the advantages of light weight, high rigidity, good reliability, etc., but the overall structural parts are cut from a single blank, and the material utilization rate is low. While removing a large amount of material, the overall structural parts caused by cutting force and cutting heat The local dimensions are out of tolerance, the contour cannot meet the precision requirements, and a large amount of residual stress is also released during the processing, which causes serious deformation of the overall structural parts and affects the asse...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 赵妍何临江杨年宝苏宏华申运锋付嘉宝徐九华
Owner NANJING CHENGUANG GRP
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