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Cutting parameter segmentation and variable cutting depth optimizing method based on dynamic machining feature

A technology of cutting parameters and dynamic processing, applied in special data processing applications, complex mathematical operations, electrical digital data processing, etc., can solve problems such as workpiece deformation, low processing efficiency, chatter, etc., to ensure stability and improve processing efficiency , Guarantee the effect of processing quality

Active Publication Date: 2016-04-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0007] The problem to be solved by the present invention is: in the numerical control machining process of aircraft structural parts, improper selection of cutting parameters will cause workpiece deformation and chatter problems. Insufficient performance, it needs to be optimized according to the kinematic characteristics of the machine tool

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  • Cutting parameter segmentation and variable cutting depth optimizing method based on dynamic machining feature
  • Cutting parameter segmentation and variable cutting depth optimizing method based on dynamic machining feature
  • Cutting parameter segmentation and variable cutting depth optimizing method based on dynamic machining feature

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Embodiment Construction

[0020] The present invention provides a cutting parameter segmentation and variable cutting depth optimization method based on dynamic machining characteristics. First, finite element software is used to analyze the workpiece model to obtain the initial frequency response function of the workpiece, and the intermediate processing state of the workpiece is obtained based on the process information of the workpiece. Then, based on the modified matrix after the change of the workpiece structure and the obtained initial frequency response function of the workpiece, the real-time frequency response function of the workpiece is predicted, and the frequency response function of the tool tip point is obtained experimentally, and the frequency response function of the intermediate machining state is calculated to establish stability Lobe diagram, select the range of depth of cut and speed range in the lobe diagram, while considering other constraints, establish an optimization model based...

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Abstract

The invention discloses a cutting parameter segmentation and variable cutting depth optimizing method based on dynamic machining feature. Firstly, a workpiece model is analyzed by finite element software, thus obtaining the initial frequency response function of the workpiece; the middle machining state of the workpiece is obtained basing on the process information of the workpiece; then the real time frequency response function of the workpiece is predicted basing on the modified modification matrix of the workpiece structure and the obtained initial frequency response function of the workpiece, the cutter point frequency response function of a cutter is obtained through a test; the frequency response function of the middle machining state is calculated; further a stable lobe graph is built; a cutting depth range and a rotating speed range are selected in the lobe graph; other constraint conditions are taken into consideration at the same time; an optimization model is built basing on the genetic algorithm; and then the feeding speed at a corner is optimized according to the moving feature of a machine tool. According to the invention, the cutting parameters are optimized basing on the dynamic machining feature; the machining quality is ensured; the machining efficiency is improved; the dynamic feature of the machine tool is taken into consideration in the segmentation optimization process, therefore the moving stability of the machine tool is ensured.

Description

Technical field [0001] The invention belongs to the technical field of numerical control processing, relates to a cutting parameter optimization method for a processed workpiece, and is a cutting parameter segmentation and variable depth optimization method based on dynamic processing characteristics. Background technique [0002] Aircraft structural parts have the characteristics of large size, rich thin-walled structure, high material removal, and high machining accuracy. Due to the above characteristics, CNC machining of aircraft structural parts has always been a problem. In the process of CNC machining of aircraft structural parts, there are often problems of workpiece deformation and chatter due to improper selection of cutting parameters. In severe cases, the workpiece will be scrapped. In actual production, in order to ensure processing quality, conservative cutting parameters are generally used for processing, but production efficiency is reduced. Furthermore, for compl...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F17/15G06F17/16G06F30/15G06F2113/28
Inventor 李迎光刘长青
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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